[0001] The invention relates to a refrigerated sales cabinet.
[0002] Refrigerated sales cabinets in supermarkets are often equipped with doors, either
sliding doors or hinged doors, which are operated by the customers who open and close
them manually.
[0003] Sometimes, customers do not close the doors fully after having taken goods out of
the refrigerated sales space which results in a loss of energy, since cooled air flows
out of the refrigerated sales space. Similarly, a loss of energy is present when the
cabinet is operated in the same way whether the doors are open or closed.
[0004] Moreover, such refrigerated sales cabinets are not hygienic as thousands of customers
per day touch the handles to open and close the refrigerated sales cabinets.
[0005] Accordingly, it is an object of the present invention to provide a refrigerated sales
cabinet comprising an improved efficiency and improved hygiene.
[0006] This object is solved completely by the subject-matter of independent claim 1. Particular
embodiments are defined in the dependent claims.
[0007] A refrigerated sales cabinet according to exemplary embodiments of the invention
comprises a door; a door operation motor configured to move the door between a closed
position and an opened position; a control unit; a door opening sensor, particularly
a touch or proximity sensor configured to sense, while the door is in its closed position,
if a hand of a customer touches the door opening sensor or if a hand of a customer
is moved close to the door opening sensor and to transmit a door opening signal indicative
of such touch or such movement to the control unit; wherein the control unit is configured
to drive the door operation motor in response to such door opening signal such that
the door operation motor moves the door the from its closed to its opened position;
and/or a door obstruction detection sensor, particularly a proximity sensor configured
to sense, while the door is in its opened position, if an object, particularly a person
or body part is positioned in the way of the closing movement of the door, and to
transmit a door closing signal indicative that no object is in the way; and wherein
the control unit is configured to drive the door operation motor in response to such
door closing signal ,such that the door operation motor moves the door the from its
opened to its closed position.
[0008] For opening and closing the door, the customers do no longer have to grip a handle
of the door and move the door manually from its closed to its opened position and
likewise from its opened to its closed position. Rather, the customer can open the
door by touching the door opening sensor with his/her hand or by approaching/ moving
his/her hand close to the door opening sensor. The door opening sensor which can be
formed as a touch or proximity sensor will sense that the hand of the customer has
touched the door opening sensor or has moved close to the same and will transmit a
door opening signal indicative of such touch or movement to the control unit. The
control unit will drive the door operation motor in response to such door opening
signal such that the door operation motor moves the door from its closed to its opened
position.
[0009] The door obstruction detection sensor which can be formed as proximity sensor senses,
while the door is in its opened position, if an object, particularly a person or a
body part is positioned in the way of the closing movement of the door and transmits
a door closing signal to the control unit if an object is or is not in the way.
[0010] The control unit will drive the door operation motor in response to such door closing
signal such that the door operation motor moves the door from its opened to its closed
position.
[0011] The door obstruction detection sensor can further be configured to transmit, while
the door is in its opened position, a door obstruction signal indicative that an object,
particularly a person or a body part, is positioned in the way of the closing movement
of the door. The control unit will maintain the door in its opened position as long
as it receives a door obstruction signal from the door obstruction detection sensor.
[0012] The capacitance properties of the door obstruction detection sensor differ when a
person or a body part or any object is in the way of the closing movement of the door.
By using a proximity sensor-based capacitance glass, this capacitance difference can
be used to detect an obstruction of the door.
[0013] Both the opening and the closing operations of the door are effected automatically
which improves the user-friendliness and facilitates the operation.
[0014] For opening the door, the customer just has to move his/her hand in front of the
door opening sensor or just touches the door opening sensor briefly which signals
the door to open. The touch/contact or movement close to the sensor is detected reliably
by the door opening sensor. This also improves the hygiene of the opening operation,
since in case the door opening sensor is formed as a proximity sensor the opening
is effected in a contactless manner, and in case the door opening sensor is formed
as a touch sensor a comparably long gripping of a handle is replaced by a simple and
short touch.
[0015] The closing operation is effected totally contactless which improves both the efficiency
and the hygiene of the refrigerated sales cabinet.
[0016] Moreover, since the door obstruction detection sensor reliably causes the closing
of the door only if no object, particularly no person, no body part, no pet or anything
is positioned in the way of the closing movement of the door, it is avoided that a
door might remain open which prevents cooled air from flowing out of the refrigerated
sales space and improves the efficiency.
[0017] According to a further advantage, the control unit always has the information about
the door opening or closing status available and can use this information to effect
an improved refrigeration operation. If the control unit has received a door closing
signal and closed the door, then the control unit has the information that the door
is in its closed state. If the control unit has received a door opening signal and
opened the door, then the control unit has the information that the door is in its
opened state. Likewise, during the opening and closing movements of the door, the
control unit has the information that the status of the door is "opening" or "closing",
respectively.
[0018] The refrigerated sales cabinet has the capability of real-time door status information
and people detection information which can also be used to obtain operational data
of the refrigerated sales cabinet
[0019] No handles have to be provided at the doors of the refrigerated sales cabinet, which
can contribute to an improved overall appearance of the refrigerated sales cabinet..
[0020] According to a first embodiment, the door opening sensor is formed as a sensor at
or within a glass pane of the door. The door opening sensor can be configured to change
its conductivity or capacitance in response to a touch or proximity of a person. The
door opening sensor can be formed as touch screen type of glass or as a proximity
glass.
[0021] By using such kind of opening sensor, and by arranging such sensor on or within a
glass pane of the door the change of conductivity or capacitance properties in response
to a hand moving close to such door opening sensor or touching the same can reliably
be sensed. At the same time the view onto the products displayed within the refrigerated
sales cabinet is not compromised by such door opening sensor.
[0022] According to a further embodiment, the door obstruction detection sensor is formed
as a sensor at or within a glass pane of the door. The door obstruction detection
sensor can be configured to change its conductivity or capacitance in response to
proximity of a person. The door obstruction detection sensor can be formed as a proximity
glass.
[0023] By using such kind of door obstruction detection sensor, and by arranging such sensor
on or within a glass pane of the door the conductivity or capacitance properties of
an object, particularly a person or a body part, being in the way of the closing movement
of the door can reliably be sensed. At the same time the view onto the products displayed
within the refrigerated sales cabinet is not compromised by such door obstruction
detection sensor.
[0024] According to a further embodiment, the door obstruction detection sensor is further
configured to transmit, while the door is in its opened position, a door obstruction
signal indicative that an object, particularly a person or a body part, is positioned
in the way of the closing movement of the door. The control unit can be configured
to maintain the door in its opened position as long as it receives a door obstruction
signal from the door obstruction detection sensor.
[0025] With this embodiment it may be reliably avoided that the door closes while a customer
or any other object is in the way of the closing movement.
[0026] According to a further embodiment, the door obstruction detection sensor is further
configured to sense, during a closing movement of the door, if an object, particularly
a person or a body part is positioned in the way of the closing movement of the door,
and to transmit a door opening or a door stopping signal indicative that an object
is in the way; and the control unit is configured to drive the door operation motor
to stop the closing movement of the door and/or to open the door again if it receives
a door opening or a door stopping signal, which can also be called door obstruction
signal from the door obstruction detection sensor during a closing movement of the
door.
[0027] With this embodiment it may be reliably avoided that the door comes into contact
with a customer who is in or moves into the way of the closing movement of the door.
[0028] According to a further embodiment, the door obstruction detection sensor is configured
to sense continuously or at intervals, while the door is in its opened position, if
an object, particularly a person or a body part is positioned in the way of the closing
movement of the door, and to transmit, continuously or at intervals, a door closing
signal indicative that no object is in the way and/or a door obstruction signal indicative
that an object is in the way.
[0029] With this embodiment it may be reliably avoided that the door stays in its opened
position for too long. If the customer that has opened the door, has for example taken
out the desired goods of the refrigerated sales space and has moved away from the
refrigerated sales cabinet again, the door obstruction detection sensor will reliably
sense that no object is in the way of the closing movement of the door anymore and
will cause the door to close. Thereby, energy efficiency is significantly improved
in comparison to conventional doors, where it happens often that a door remains open
or is not fully closed after the customer has taken out the desired goods from the
refrigerated sales space.
[0030] According to a further embodiment, the control unit is configured to transmit an
alarm signal indicative of an excess door opening time if it receives door obstruction
signals from the door obstruction detection sensor over a predetermined period of
time.
[0031] Such alarm signal can be sent to the supermarket owner or to the cabinet service
department to warn that the respective door has been in its opened position beyond
a predetermined threshold. Transmitting such alarm signal can also contribute to energy
efficiency and to detecting malfunction of the refrigerated sales cabinet.
[0032] According to a further embodiment, the refrigerated sales cabinet further comprises
a door frame surrounding the glass pane. A microcontroller can be arranged at or embedded
within the door frame. Such microcontroller can be configured to transmit at least
one of the door opening signal, the door stopping signal, the door closing signal,
and the door obstruction signal to the control unit in a wired or wireless fashion.
[0033] Such microcontroller reliably receives and processes the sensed signal of the change
of conductivity or capacitance properties in the glass.
[0034] Alternatively, such microcontroller can also be placed in other parts of the refrigerated
sales cabinet.
[0035] With this embodiment the microcontroller can be hidden from the customers' view.
Such microcontroller has the function of reliably transmitting at least one of the
doors opening signal, the door closing signal and the door obstruction signal to the
control unit.
[0036] According to a further embodiment, the control unit is configured to drive at least
one evaporator fan of an evaporator arranged within the refrigerated sales cabinet
to run with adapted rotational speed. after receiving a door opening signal.
[0037] In one embodiment, the control unit is configured to drive at least one evaporator
fan of an evaporator arranged within the refrigerated sales cabinet to run with reduced
speed or to stop operation, after receiving a door opening signal. With this embodiment,
the energy efficiency of the refrigerated sales cabinet is further improved. In the
opened position of the door the at least one evaporator fan runs with reduced speed
or even stops, in order to prevent that cooled air continues to be blown over or sucked
through the evaporator coils of the evaporator. This avoids waste of energy.
[0038] In another embodiment, the control unit is configured to drive at least one evaporator
fan of an evaporator arranged within the refrigerated sales cabinet to run with increased
speed, after receiving a door opening signal, in order to create a strong air curtain
and avoid too much infiltration. Such embodiment is particularly suitable for refrigerated
sales cabinets which are formed as vertical multidecks.
[0039] Likewise, the control unit can be configured to drive at least one evaporator fan
of an evaporator arranged within the refrigerated sales cabinet to run with normal
operational speed again, after receiving a door closing signal.
[0040] According to a further embodiment, the door is formed as a hinged/pivoting door having
a lateral outer portion close to the hinges and a lateral inner portion opposite the
lateral outer portion. The hinged door can be pivoted between a closed position in
which the door closes the front of the refrigerated sales space of the refrigerated
sales cabinet and lies in a vertical front plane of the refrigerated sales cabinet,
and an opened position in which the hinged door is pivoted out of such vertical front
plane and allows access to the refrigerated sales space of the refrigerated sales
cabinet.
[0041] According to a further embodiment, the door opening sensor is arranged at a middle
vertical portion of the hinged door, particularly at a middle vertical portion of
the lateral inner portion of the hinged door. The door obstruction detection sensor
can be arranged at the lateral inner portion of the hinged door, and particularly
extends at least partially over the height of the glass pane of the hinged door. The
door opening sensor can be formed as part of the door obstruction detection sensor.
[0042] By arranging the door obstruction detection sensor to extend at least partially over
the height of the glass pane of the sliding door also small customers, for example
children, can reliably be detected.
[0043] According to a further embodiment, the door obstruction detection sensor, particularly
a proximity sensor is configured to sense, while the hinged door is in its opened
position, if an object, particularly a person or a body part is positioned between
the lateral inner portion of the hinged door, where the door obstruction detection
sensor is arranged, and the vertical front plane of the refrigerated sales cabinet,
and to transmit a door closing signal indicative that no object is in the way.
[0044] According to a further embodiment, the door is formed as a sliding door having a
lateral outer portion close to a side wall of the refrigerated sales cabinet and a
lateral inner portion opposite the lateral outer portion. The sliding door is moveable
between a closed position in which the sliding door closes the front of the refrigerated
sales space of the refrigerated sales cabinet, and in which its lateral inner portion
abuts either against a door frame post, a cabinet side wall or an adjacent door, and
an opened position in which the sliding door is slid to the side, and in which its
lateral inner portion is spaced apart from the respective door frame post, the respective
cabinet side wall or the respective adjacent door, thereby allowing access to the
refrigerated sales space of the refrigerated sales cabinet.
[0045] According to a further embodiment, the door opening sensor is arranged at a middle
vertical portion of the sliding door, particularly at a middle vertical portion of
the lateral inner portion of the sliding door. The door obstruction detection sensor
can be arranged at the lateral inner portion of the sliding door, and particularly
extends at least partially over the height of the glass pane of the sliding door.
The door opening sensor can be formed as part of the door obstruction detection sensor.
[0046] According to a further embodiment, the door obstruction detection sensor, particularly
a proximity sensor is configured to sense, while the sliding door is in its opened
position, if an object, particularly a person or a body part is positioned between
the lateral inner portion of the sliding door, where the door obstruction detection
sensor is arranged, and the respective door frame post, the respective cabinet side
wall or the respective adjacent door.
[0047] According to a further embodiment, the refrigerated sales cabinet further comprises
a cabinet frame which can form the front edge of the cabinet body where the doors
are arranged. The control unit can be arranged at or embedded within the cabinet frame.
The control unit can be formed as part of the cabinet controller.
[0048] According to a further embodiment, the refrigerated sales cabinet further comprises
a display and/or a projector configured to display the door status. The control unit
and/or the microcontroller are configured to cause the display and/or projector to
display the door status.
[0049] The door opening sensor and/or the door obstruction detection sensor can also be
formed by other means, for example through optical sensors, radar, or any other people
detection technologies.
[0050] According to a further embodiment, the refrigerated sales cabinet comprises a suitable
number of doors, for example one, two, three, four or more doors.
[0051] According to a further embodiment, at least one door of the refrigerated sales cabinet,
particularly all the doors of the refrigerated sales cabinet, can be formed as transparent
door(s).
[0052] In the following, a refrigerated sales cabinet according to exemplary embodiments
of the invention is described in more detail with respect to the enclosed figures.
Fig. 1 shows a perspective view of a refrigerated sales cabinet with its two hinged
doors being in their respective closed positions and with a customer standing in front
of the refrigerated sales cabinet.
Fig. 2 shows a perspective view of the refrigerated sales cabinet of Fig. 1 with the
right hand hinged door being in its opened position, pivoted out of the vertical front
plane of the refrigerated sales cabinet and with a customer standing in front of the
refrigerated sales space in order to take out goods therefrom and standing in the
way of the closing movement of the right hand hinged door.
Fig. 3 shows a perspective view of the refrigerated sales cabinet of Fig. 2 with the
right hand hinged door still being in its opened position pivoted out of the vertical
front plane of the refrigerated sales cabinet where the customer has moved away from
the refrigerated sales cabinet.
Fig. 4 shows a schematic front view of the right-hand side hinged door of the refrigerated
sales cabinet of Figs. 1 to 3 with a door opening sensor and of a microcontroller
and a control unit.
Fig. 5 shows a schematic front view of the right-hand hinged door of the refrigerated
sales cabinet of Figs. 1 to 3 comprising a door obstruction detection sensor and of
a microcontroller and a control unit.
Fig. 6 shows a schematic front view of the right-hand hinged door of the refrigerated
sales cabinet of Figs. 1 to 4 comprising both a door opening sensor and a door obstruction
detection sensor and of a microcontroller and a control unit.
[0053] In figures 1 through 3, the refrigerated sales cabinet 2 comprises a cabinet body
4 with a bottom portion, a rear wall and a ceiling/roof portion as well as sidewalls.
Within the cabinet body 4, a refrigerated sales space is formed in which refrigerated
goods are stored and displayed. The refrigerated sales cabinet 2 comprises at least
one evaporator and an expansion device associated therewith, of a vapor compression
cycle. Refrigerant flows through such vapor compression cycle which comprises, in
addition to the expansion device and the evaporator, a compressor unit, a condenser/liquefier
and refrigerant conduits circulating a refrigerant therethrough. The at least one
evaporator can be equipped with an evaporator fan configured for blowing or sucking
air over the coils of the evaporator.
[0054] The front side of the refrigerated sales cabinet 2 is equipped with two doors 8 which
are formed as hinged/pivoting doors in the embodiments of the Figures, but can also
be formed as sliding doors.
[0055] Both doors 8 can be pivoted by means of hinges that are mounted to the vertical side
posts of the cabinet body 4. Both doors 8 comprise a lateral outer portion 14 close
to the hinges and a lateral inner portion 16 opposite the lateral outer portion 14.
Both doors 8 can be pivoted between the closed position depicted in Fig. 1 in which
the doors 8 close the front of the refrigerated sales space of the refrigerated sales
cabinet 2 and lie in a vertical front plane of the refrigerated sales cabinet 2, and
an opened position in which the doors 8 are pivoted out of such vertical front plane
and allow access to the refrigerated sales space of the refrigerated sales cabinet
2, as can be seen in Figs. 2 and 3.
[0056] At least one door operation motor (not shown) is provided and configured to move
the doors 8 between the closed and the opened positions.
[0057] The refrigerated sales cabinet 2 comprises for example two doors 8, namely a lefthand
door 8 and a right-hand door 8. The doors can be transparent. As a matter of course,
refrigerated sales cabinets can be equipped with any suitable number of doors.
[0058] Each of the two doors 8 of the refrigerated sales cabinet 2 can be equipped with
a respective door opening sensor 18 which can be formed as touch or proximity sensor
and can be configured to sense, while the respective door is in a closed position
if a hand of a customer touches the door opening sensor 18 or if a hand of a customer
is moved close to the door opening sensor 18 or slides over the same, and to transmit
a door opening signal indicative of such touch or such movement to a control unit
20, particularly via a microcontroller 20.
[0059] Each of the two doors 8 can be provided with a microcontroller 20 which can be arranged
at or embedded within a door frame 12.
[0060] Furthermore, a control unit 22 is provided which is configured to drive the door
operation motor in response to such door opening signal such that the door operation
motor moves the door 8 from its closed to its opened position. The control unit 22
can be arranged at or embedded within the cabinet frame or the cabinet body 4. In
the embodiments shown in the Figures, the control unit 22 is arranged at a ceiling/roof
portion of the cabinet body 4.
[0061] As can be seen in Fig. 1, the door opening sensor 18 is arranged at a middle vertical
portion of the lateral inner portion 16 of the right door 8. A corresponding door
opening sensor (not shown) is arranged at a middle vertical portion of the lateral
inner portion 16 of the left door 8.
[0062] The door opening sensors 18 are particularly formed as touch or proximity sensors
on or within a glass pane 10 of the doors 8, and are configured to change their conductivity
or capacitance in response to a touch or proximity of a person. For example, if a
person touches or moves close to a door opening sensor 18, then the conductivity and/or
capacitance values of the door opening sensor 18 change, compared to a situation where
no person touches the door opening sensor 18 or is close to the same. The door opening
sensors can particularly be formed as touch screen type of glass or as a proximity
glass. Both doors 8 respectively comprise a glass pane 10 which can be configured
as double or triple glass pane and a door frame 12 enclosing the glass pane 10. In
particular the doors 8 do not need to have a handle.
[0063] In Figs. 2 and 3 it can well be seen that the right door 8 is also equipped with
a door obstruction detection sensor 24, and a corresponding door obstruction detection
sensor (not shown) can also be provided at the handle of the door 8.
[0064] The door obstruction detection sensor or detector 24 is particularly formed as proximity
sensor configured to sense, while the door 8 is in its open position, if an object,
particularly a person or a body part is positioned in the way of the closing movement
of the door 8, and to transmit a door closing signal indicative that no object is
in the way to the control unit 22, particularly via the microcontroller 20. The control
unit 22 is configured to drive the door operation motor in response to such door closing
signal, such that the door operation motor moves the door 8 from its opened to its
closed position.
[0065] The door obstruction detection sensor 24 is arranged at the lateral outer portion
16 of the door 8 and extends at least partially over the height of the glass pane
10, particularly over the full height of the glass pane 10 of the door 8, to ensure
detection of any object, particularly no person, nobody part, no per or anything is
present in between the door and the cabinet, at any length. The door obstruction detection
sensor 24 can be formed as a sensor on or within the glass pane 10 of the door 8 and
can be configured to change its conductivity or capacitance in response to proximity
of a person. Particularly, the door obstruction sensor 24 can be formed as proximity
glass.
[0066] The door obstruction detection sensor 24 can be further configured to transmit, while
the door 8 is in its opened position, a door obstruction signal indicative that an
object, particularly a person or a body part, is positioned in the way of the closing
movement of the door 8. The control unit 22 can be configured to maintain the door
8 in its open position as long as it receives the door obstruction signal from the
door obstruction detection sensor 24.
[0067] As a further safety measure, the door obstruction detector 24 can be further configured
to sense, during a closing movement of the door 8, if an object, particularly a person
or a body part is positioned in the way of the closing movement of a door 8, and to
transmit a door opening or door stopping signal indicative that an object is in the
way. The control unit 22 can be configured to drive the door operation motor to stop
the closing movement of the door 8 and to open the door 8 again if it receives a door
obstruction signal from the door obstruction detection sensor 24 during a closing
moving of the door 8.
[0068] In order to improve efficiency, the door obstruction detection sensor 24 can further
be configured to sense continuously or at intervals, while the door 8 is in its opened
position, if an object, particularly a person or a body part is positioned in the
way of the closing movement of the door 8, and to transmit a door closing signal indicative
that no object is in the way and/or a door obstruction signal indicative that an object
is in the way.
[0069] The control unit 22 can be configured to transmit an alarm signal indicative of an
excess door opening time if it receives door obstruction signals from the door obstruction
detection sensor 24 over a predetermined period of time.
[0070] The door opening, door closing and door obstruction signals can be transmitted from
the sensors 18, 24 via their respective microcontroller 20 to the control unit 22
in wireless or wired fashion.
[0071] In order to further improve efficiency of the refrigerated sales cabinet 2, the control
unit 22 can be configured to drive the at least one evaporator fan of an evaporator
arranged within the refrigerated sales cabinet 2 to run with adapted rotational speed,
after receipt of the door opening signal. In one embodiment, the control unit 22 can
be configured to drive at least one evaporator fan of the evaporator to run with reduced
speed or to stop operation, after receiving a door opening signal, in order to further
improve the energy efficiency of the refrigerated sales cabinet 2. In another embodiment,
the control unit 22 is configured to drive at least one evaporator fan of the evaporator
to run with increased speed, after receiving a door opening signal, in order to create
a strong air curtain and avoid too much infiltration.
[0072] The control unit 22 can be further configured to drive the at least one evaporator
fan of the evaporator to run with normal operational speed again, after receipt of
the door closing signal.
[0073] Particularly, the door obstruction detection sensor 24 can be configured to sense,
while the door 8 is in its opened position, in which the door 8 is pivoted out of
the vertical front plane of the refrigerated sales cabinet 2, if an object, particularly
a person or a body part is positioned between the lateral outer portion 16 of the
door 8, where the door obstruction detection sensor 24 is arranged and the vertical
front plane of the refrigerated sales cabinet 2, and to transmit a door closing signal
indicative that no object is in the way, to the control unit 22.
[0074] In Fig. 1 a customer moves to the refrigerated sales cabinet 2 and moves his hand
close to/slides his hand over the door opening sensor 18, in case the door opening
sensor is formed as a proximity sensor, or touches the door opening sensor 18 in case
the door opening sensor 18 is formed as touch sensor. The change in conductivity or
capacitance is detected by the door opening sensor 18, and the door opening sensor
18 transmits, particularly via its microcontroller 20, a door opening signal indicative
of such movement or such touch to the control unit 22. The control unit 22 drives
the door operation motor in response to such door opening signal such that the door
operation motor moves the door 8 from its closed to its opened position, as can be
seen in Fig. 2.
[0075] The customer can then access the goods within the refrigerated sales space and take
out goods as desired. While the customer is standing in the way of the closing movement
of the door 8, as depicted in Fig. 2, the door obstruction detection sensor 24 will
transmit a door obstruction signal indicative that an object, particularly the customer
is positioned in the way of the closing movement of the door 8, and the control unit
22 controls the door operation motor such that the door 8 will stay in its opened
position as long as it receives such door obstruction signals from the door obstruction
detection sensor 24, as can well be understood when viewing Fig. 2.
[0076] After taking out the desired goods from the refrigerated sales space, the customer
will then move away from the refrigerated sales space 2 and the door obstruction detection
sensor will sense that no object, particularly no customer is positioned in the way
of the closing movement of the door 8 anymore. Consequently, it will transmit a door
closing signal indicative that no object is in the way, to the control unit 22. The
control unit 22 will then drive the door operation motor in response to such door
closing signal such that the door operation motor moves the door 8 from its opened
position (Fig. 3) to its closed position (Fig. 1).
[0077] After receiving a door opening signal, the control unit 22 can control the evaporator
fan of an evaporator arranged within the refrigerated sales cabinet 2 to run with
reduced speed or to stop operation. After receipt of the door closing signal, it can
drive such evaporator fan to run with normal operational speed again.
[0078] The sensing if an object, particularly a person or a body part is positioned in the
way of the closing movement of the door 8 can be done continuously or at intervals.
[0079] In Fig. 4 it can be seen that the door opening sensor 18 is formed as a rectangular
portion on or within the glass pane 10 at a position where normally a handle would
be placed, namely at the lateral outer portion 16 at a position that each customer
can easily reach.
[0080] The microcontroller 20 is schematically depicted beside the door frame 12, but can
well be integrated within the frame.
[0081] The control unit 22 is typically arranged at a ceiling/roof portion of the cabinet
body 4. The control unit 22 can be part of the cabinet controller, or an independent
one.
[0082] In Fig. 5 it can well be seen that the door obstruction detection sensor 24 extends
over the full height of the glass pane 10 of the door 8 at a lateral portion 16 of
the door. With this embodiment, it is ensured that also small objects, particularly
small customers or children, will reliably be detected by the door obstruction detection
sensor 24.
[0083] In the embodiment of Fig. 6, the door opening sensor 18 is formed as part of the
door obstruction detection sensor 24. The door obstruction detection sensor 24 is
formed at the lateral outer portion 16 of the door 8 and extends over the full height
of the glass pane 10 thereof. Its vertical middle portion also forms the door opening
sensor 18.
[0084] While the invention has been described with reference to exemplary embodiments, it
will be understood by those skilled in the art that various changes may be made and
equivalents may be substituted for elements thereof without departing from the scope
of the claims. In addition many modifications may be made to adopt a particular situation
or material to the teachings of the invention without departing from the scope of
the claims. Therefore, it is intended that the invention not be limited to the particular
embodiment disclosed, but that the invention includes all embodiments falling within
the scope of the claims.
List of reference numerals:
[0085]
- 2
- refrigerated sales cabinet
- 4
- cabinet body
- 6
- refrigerated sales space
- 8
- hinged door
- 10
- glass pane
- 12
- door frame
- 14
- lateral outer portion close to the hinges
- 16
- lateral inner portion
- 18
- door opening sensor
- 20
- microcontroller
- 22
- control unit
- 24
- door obstruction detection sensor
1. Refrigerated sales cabinet (2) comprising
a door (8);
a door operation motor configured to move the door (8) between a closed position and
an opened position;
a control unit (22);
a door opening sensor (18), particularly a touch or proximity sensor configured to
sense, if a customer touches the door opening sensor (18) or if a customer moves close
to the door opening sensor (18), and to transmit a door opening signal indicative
of such touch or such movement to the control unit (22); and
wherein the control unit (22) is configured to drive the door operation motor in response
to such door opening signal and to open the door; and/or
a door obstruction detection sensor (24), particularly a proximity sensor configured
to sense, while the door (8) is in its opened position, if an object is positioned
in the way of the closing movement of the door (8), and to transmit a door closing
signal indicative that no object is in the way to the control unit (22); and
wherein the control unit (22) is configured to drive the door operation motor in response
to such door closing signal and to close the door.
2. Refrigerated sales cabinet (2) of claim 1,
wherein the door opening sensor (18) is formed as a sensor on or within a glass pane
(10) of the door (8); and/or
wherein the door opening sensor (18) is configured to change its conductivity or capacitance
in response to a touch or proximity of a person; and/or
wherein the door opening sensor (18) is formed as touch screen type of glass or as
a proximity glass.
3. Refrigerated sales cabinet (2) of claim 1 or 2,
wherein the door obstruction detection sensor (24) is formed as a sensor on or within
a glass pane (10) of the door (8); and/or
wherein the door obstruction detection sensor (24) is configured to change its conductivity
or capacitance in response to proximity of a person; and/or
wherein the door obstruction detection sensor (24) is formed as a proximity glass.
4. Refrigerated sales cabinet (2) of any of the preceding claims,
wherein the door obstruction detection sensor (24) is further configured to transmit,
while the door (8) is in an open position, a door obstruction signal indicative that
an object, particularly a person or a body part, is positioned in the way of the closing
movement of the door (8).
5. Refrigerated sales cabinet (2) of any of the preceding claims,
wherein the door obstruction detection sensor (24) is further configured to sense,
during a closing movement of the door (8), if an object, particularly a person or
a body part is positioned in the way of the closing movement of the door (8), and
to transmit a door opening or a door stopping signal indicative that an object is
in the way; and
wherein the control unit (22) is configured to drive the door operation motor to stop
the closing movement of the door (8) and/or to open the door (8) again if it receives
a door obstruction signal from the door obstruction detection sensor (24) during a
closing movement of the door (8).
6. Refrigerated sales cabinet (2) of claim 4 or 5,
wherein the door obstruction detection sensor (24) is configured to sense continuously
or at intervals, while the door (8) is in an open position, if an object, particularly
a person or a body part is positioned in the way of the closing movement of the door
(8), and to transmit, continuously or at intervals, a door closing signal indicative
that no object is in the way and/or a door obstruction signal indicative that an object
is in the way; and/or
wherein the control unit (22) is configured to transmit an alarm signal indicative
of an excess door opening time if it receives door obstruction signals from the door
obstruction detection sensor (24) over a predetermined period of time.
7. Refrigerated sales cabinet (2) of any of the preceding claims,
further comprising a door frame (12) surrounding the glass pane (10); and
wherein a microcontroller (20) is arranged at or embedded within the door frame (12),
the microcontroller (20) being configured to transmit at least one of the door opening
signal, the door closing signal, and the door obstruction signal to the control unit
(22) in a wired or wireless fashion.
8. Refrigerated sales cabinet (2) of any of the preceding claims,
wherein the control unit (22) is configured to drive at least one evaporator fan of
an evaporator arranged within the refrigerated sales cabinet (2) to run with adapted
rotational speed, particularly increased or reduced speed or to stop operation, after
receipt of the door opening signal; and/or
wherein the control unit (22) is configured to drive at least one evaporator fan of
an evaporator arranged within the refrigerated sales cabinet (2) to run with normal
operational speed again, after receipt of the door closing signal.
9. Refrigerated sales cabinet (2) of any of the preceding claims,
wherein the door (8) is formed as a hinged/pivoting door having a lateral outer portion
(14) close to the hinges and a lateral inner portion (16) opposite the lateral outer
portion (14);
wherein the hinged door is moveable between a closed position in which the door (8)
closes the front of the refrigerated sales space of the refrigerated sales cabinet
(2) and lies in a vertical front plane of the refrigerated sales cabinet (2), and
an open position in which the hinged door is pivoted out of such vertical front plane
and allows access to the refrigerated sales space of the refrigerated sales cabinet
(2).
10. Refrigerated sales cabinet (2) of claim 9,
wherein the door opening sensor (18) is arranged at a middle vertical portion of the
hinged door, particularly at a middle vertical portion of the lateral inner portion
(16) of the hinged door; and/or
wherein the door obstruction detection sensor (24) is arranged at the lateral inner
portion (16) of the hinged door, and particularly extends at least partially over
the height of the glass pane (10) of the hinged door; and/or
wherein the door opening sensor (18) is formed as part of the door obstruction detection
sensor (24).
11. Refrigerated sales cabinet (2) of claim 9 or 10,
wherein the door obstruction detection sensor (24), particularly a proximity sensor
is configured to sense, while the hinged door is in an open position, if an object,
particularly a person or a body part is positioned between the lateral inner portion
(16) of the hinged door, where the door obstruction detection sensor (24) is arranged,
and the vertical front plane of the refrigerated sales cabinet (2), and to transmit
a door closing signal indicative that no object is in the way.
12. Refrigerated sales cabinet (2) of any of claims 1 to 8,
wherein the door (8) is formed as a sliding door having a lateral outer portion close
to a side wall of the refrigerated sales cabinet (2) and a lateral inner portion opposite
the lateral outer portion;
wherein the sliding door is moveable between a closed position in which the sliding
door closes the front of the refrigerated sales space of the refrigerated sales cabinet
(2) and in which its lateral inner portion abuts against a door frame post, a cabinet
side wall or an adjacent door (8), and an opened position in which the sliding door
is slid to the side and in which its lateral inner portion is spaced apart from the
respective door frame post, the respective cabinet side wall or the respective adjacent
door (8), thereby allowing access to the refrigerated sales space of the refrigerated
sales cabinet (2).
13. Refrigerated sales cabinet (2) of claim 12,
wherein the door opening sensor (18) is arranged at a middle vertical portion of the
sliding door, particularly at a middle vertical portion of the lateral inner portion
of the sliding door; and/or
wherein the door obstruction detection sensor (24) is arranged at the lateral inner
portion of the sliding door, and particularly extends at least partially over the
height of the glass pane (10) of the sliding door; and/or
wherein the door opening sensor (18) is formed as part of the door obstruction detection
sensor (24).
14. Refrigerated sales cabinet (2) of claim 12 or 13,
wherein the door obstruction detection sensor (24), particularly a proximity sensor
is configured to sense, while the sliding door is in an open position an object, particularly
a person or a body part is positioned between the lateral inner portion of the sliding
door, where the door obstruction detection sensor (24) is arranged, and the respective
door frame post, the respective cabinet side wall or the respective adjacent door
(8).
15. Refrigerated sales cabinet (2) of any of the preceding claims,
further comprising a cabinet frame;
wherein the control unit (22) is arranged at or embedded within the cabinet frame;
wherein the control unit (22) is formed as part of the cabinet controller; and/or
further comprising a display and/or a projector configured to display the door status;
and/or
wherein the control unit (22) and/or the microcontroller (20) is configured to cause
the display and/or projector to display the door status.