[0001] The present invention relates to a lift platform and a home lift comprising the lift
platform.
[0002] Lift platforms are machines intended for lifting people or loads in lift shafts for
exclusive use, typically closed and accessible through safety landing doors.
[0003] In this context, the focus is on screw-driven lift platforms. An example of such
a lift platform, according to the state of the art, is shown in figure 1, in which
the following are recognised:
- a lifting table 20, driven by an electric motor 21;
- an endless screw 22 fixed in the lift shaft;
- a rotating nut screw 23 mounted on the lifting table 20.
[0004] The rotation of the nut screw 23 causes the lifting table 20 to rise or fall as a
function of the direction of rotation. The sliding of the lifting table 20 in the
lift shaft is guided by a pair of substantially vertical guides, which are indicated
in figure 1 with the identification numbers 24a, 24b.
[0005] As is known, a screw-driven lift platform has several advantages over other known
solutions, including:
- the inherent safety of the lifting system, obtainable with simple and inexpensive
mechanical devices, which prevents uncontrolled movements of the lifting table;
- the absence of additional machine spaces separated from the lift shaft, unlike hydraulically-driven
platforms;
- the absence of mechanical devices that add bulk to the pit and/or the head in the
lift shaft (unlike platforms driven by an electric hoist), which allows fully exploiting
the vertical space available and installation even
in very small spaces in height.
[0006] Two types of screw-driven lift platforms drives are known, which differ in terms
of the lifting table used and the platform control methodology.
[0007] The first known type, illustrated in figure 2, is a lift platform with an open lifting
table 20, i.e. not equipped with perimeter walls. The lifting table 20 is provided
with sensitive edges along the entire perimeter to ensure user safety. In fact, a
small gap is defined between the lifting table and the walls of the lift shaft in
order to avoid the "shearing" of the users, that is, the trapping of the same between
the mobile table and the fixed walls of the lift shaft.
[0008] Safety regulations require a manual manoeuvre (called a "dead man's switch" in technical
jargon): the user must continuously push the command (for example button 25) to move
the lifting table 20. If the pressure on the control 25 ceases, the lifting table
20 stops.
[0009] The lift platform with an open lifting table is, however, disadvantageous for users
with motor deficits.
[0010] In addition, the presence of sensitive edges required by safety regulations introduces
mechanical elements subject to wear and breakdowns.
[0011] In addition, having a direct visual or tactile relationship with the lift shaft during
the sliding of the lifting table, without separation elements, is not pleasant for
the user.
[0012] The second known type, illustrated in figures 3a-3b, is a lift platform with a closed
lifting table or "cabin".
[0013] The lifting table 20 is completely delimited by perimeter walls and a roof, collectively
defining a cabin 2, which avoids the direct contact of the passengers with the lift
shaft. The access to the cabin 2 is closed by an automatic sliding or folding door,
indicated with the number 5.
[0014] In this second type, the manoeuvre is therefore automatic: the user activates the
movement of the lifting table by pushing the control once, without maintaining the
pressure.
[0015] This type of lift platform also has intrinsic limits.
[0016] First of all, the sliding automatic door implies the presence of an operator mechanism
of considerable mass, which subtracts useful capacity from the lifting table and adds
bulk at the head in the lift shaft (above the roof of the cabin) and also lateral
bulk, for the folding up of the doors in the open configuration. The automatic folding
door also has a bulk that reduces the useful load of the table.
[0017] A lift platform according to the preamble of claim 1 is further known from the document
EP2848570.
[0018] In this context, the technical task that is the basis of the present invention is
to propose a lift platform and a home lift that overcome the drawbacks of the cited
prior art.
[0019] In particular, the object of the present invention is to propose a lift platform
and a home lift that can be used by any user in compliance with safety regulations.
[0020] Another object of the present invention is to provide a lift platform with reduced
dimensions with respect to lift platforms with a cabin and, at the same time, also
usable in contexts where automatic manoeuvring is not possible for safety reasons.
[0021] The stated technical task and specified objects are substantially achieved by a lift
platform comprising:
- a cabin slidable in a lift shaft, the cabin having an entrance at which a door is
mounted that may be manually opened/closed;
- means for detecting an open/closed condition of the door;
- a selector for selecting the sliding of the cabin in the lift shaft, the selector
being configurable by a user in a first mode in which it enables the automatic sliding
of the cabin in the lift shaft, and in a second mode in which it enables the manual
sliding off the cabin in the lift shaft;
- a control unit configured in such a way that:
- in response to the detection of the closed condition of the door by the detecting
means, the control unit allows to configure the selector in the first mode;
- in response to the detection of the open condition of the door by the detecting means,
the control unit allows to configure the selector only in the second mode.
[0022] Preferably, the lift platform also comprises a safety barrier operatively active
on the entrance to detect the presence of obstacles.
[0023] In particular, the safety barrier is a photoelectric safety barrier comprising a
first device configured to emit electromagnetic radiations and a second device configured
to receive the electromagnetic radiations coming from the first device.
[0024] In accordance with one embodiment, the first device and the second photoelectric
safety barrier device are installed on opposite sides of the door.
[0025] Preferably, the control unit is also configured to disable the sliding of the cabin
in response to the detection of the open condition of the door by said detecting means
and the detection of obstacles near the entrance by the safety barrier.
[0026] In accordance with one embodiment, the selector is a button for which:
- the configuration of the first mode by the user is obtained by pushing the button
only once;
- the configuration of the second mode by the user is obtained by continuously pushing
this button.
[0027] In accordance with one embodiment, the door is a double-leaf door.
[0028] In accordance with another embodiment, the door is a folding door. Preferably, the
lift platform also comprises an emergency stop device arranged near the selector and
manually activatable by the user to stop the sliding of the cabin.
[0029] The stated technical task and specified aims are substantially achieved by a home
lift, comprising:
- a lift platform in accordance with the present invention;
- an endless screw sliding apparatus, which is operably active on the cabin of the lift
platform for activating the sliding thereof in the lift shaft.
[0030] Further characteristics and advantages of the present invention will become more
apparent from the indicative and thus non-limiting description of a preferred, but
not exclusive, embodiment of a lift platform and a home lift comprising the lift platform,
as illustrated in the appended drawings, in which:
- figures 1, 2, 3a, 3b illustrate home lifts of known type;
- figures 4a and 4b illustrate a home lift comprising a lift platform, in accordance
with the present invention, respectively in a perspective view from above and in a
perspective view from below;
- figure 5 illustrates the home lift of figures 4a-4b, in a sectional transverse view;
- figure 6 illustrates a different embodiment of the home lift of figures 4a-4b, in
a sectional transverse view.
[0031] With reference to the accompanying figures, a lift platform, which is an object of
the present invention, is indicated with the reference number 1. This lift platform
1 comprises a cabin 2 slidable in a lift shaft 3. The cabin 2 has at least one entrance
4 at which a door 5 is mounted that may be manually opened/closed.
[0032] In a first embodiment, illustrated in figure 5, the door 5 is a double-leaf door,
in particular with two panels 5a, 5b with manual opening towards the interior of the
cabin 2.
[0033] In a second embodiment, illustrated in figure 6, the door 5 is a folding door.
[0034] Both types of doors are of the known type and will not be described further.
[0035] Advantageously, the lift platform 1 is provided with means (not illustrated) to detect
an open/closed condition of the door 5.
[0036] The lift platform 1 further comprises a selector 7 for selecting the sliding of the
cabin 2 in the lift shaft 3. Originally, the selector 7 is configurable by a user
in a first mode in which it enables the automatic sliding of the cabin 2 in the lift
shaft 3, and in a second mode in which it enables the manual sliding of the cabin
2 in the lift shaft 3.
[0037] In this context, "automatic sliding" means that, once the sliding of the cabin 2
in the lift shaft 3 has been activated by the user, the cabin 2 slides without further
intervention by the user.
[0038] "Manual sliding", on the other hand, means that the cabin 2 can only slide in the
lift shaft 3 through the continuous intervention by the user.
[0039] For example, in the embodiments described and illustrated herein, the selector 7
is a key or a button for which:
- the configuration of the first mode by the user is obtained by pushing the button
7 only once;
- the configuration of the second mode by the user is instead obtained by continuously
pushing the button 7. In other words, the user must press the button 7 for the entire
duration of the sliding of the cabin 2 in the lift shaft 3.
[0040] Preferably, near the entrance 4 a safety barrier 8a, 8b is installed which is operatively
active on the entrance 4 to detect the presence of obstacles.
[0041] In particular, the safety barrier 8a, 8b is a photoelectric barrier comprising a
first device 8a (also called "emitter") and a second device 8b (also called "receiver").
[0042] The emitter 8a is configured to emit electromagnetic radiations, while the receiver
8b is configured to receive the radiations from the emitter 8a.
[0043] In the embodiments described and illustrated herein, the emitter 8a and the receiver
8b are installed on opposite sides of the door 5, outside the cabin 2, so as to detect
the presence of obstacles near the entrance 4. Advantageously, the lift platform 1
further comprises a control unit 6 configured in such a way that:
- in response to the detection of the closed condition of the door 5, the control unit
6 allows to configure the selector 7 in the first mode;
- in response to the detection of the open condition of the door 5, the control unit
6 allows to configure the selector 7 only in the second mode.
[0044] In particular, in response to the detection of the open condition of the door 5 and
the detection of obstacles near the entrance 4 by the safety barrier 8, the control
unit 6 is configured to disable the sliding of the cabin 2. This takes place regardless
of whether the user configures the selector 7 in the second mode.
[0045] In addition, an emergency stop device (not shown) is provided, located near the selector
7. In particular, the emergency stop device is a stop button manually activatable
by the user to stop the sliding of the cabin 2. The number 100 indicates a home lift
comprising:
- the lift platform 1;
- an endless screw sliding apparatus 101 operably active on the cabin 2 of the lift
platform 1 for activating the sliding thereof in the lift shaft 3.
[0046] The endless screw sliding apparatus 101 is of a known type, similar to that illustrated
in figure 1, and will not be further described.
[0047] The functioning of the lift platform, according to the present invention, is briefly
described below.
[0048] When a user must enter the cabin 2, he manually opens the door 5, for example by
pushing the doors 5a, 5b towards the inside of the cabin 2 (see figure 5).
[0049] The door 5 then passes from the closed condition, in which entry into the cabin 2
is prevented, to the open condition, in which the user is allowed to enter the cabin
2.
[0050] Once the user has entered the cabin 2, he closes the door 5 again, for example by
pushing the doors 5a, 5b towards the outside of the cabin 2.
[0051] In response to the detection of the closed door condition by the detecting means,
the control unit 6 allows the user to activate the automatic sliding of the cabin
2 through a single push of the button 7 (first mode).
[0052] In fact, since the door 5 is closed, the automatic sliding can be safely activated.
[0053] If it is not possible to close the door 5, for example due to people or loads standing
in the space necessary to open/close the door 5, the automatic sliding (first mode)
is not allowed for safety reasons.
[0054] There are two possibilities:
- if the safety barrier 8 does not detect obstacles near the entrance 4, the control
unit 6 allows the user to activate the manual sliding of the cabin 2 (second mode)
by continuously pushing the button 7. If the pressure fails at any moment of the sliding,
the control unit 6 stops the cabin 2;
- if the safety barrier 8 detects obstacles near the entrance 4, the control unit 6
does not in any way allow the user to activate the sliding of the cabin 2 (neither
automatically nor manually).
[0055] In the embodiments described and illustrated herein, the cabin 2 has a single entrance.
In variant embodiments of the invention, multiple entrances are provided.
[0056] The lift platform 1 can be installed either by creating a basic containment pit or
without a pit. In the first case the lower access is flush with the floor, in the
second case a small fixed access ramp can be used.
[0057] The characteristics of the lift platform and the home lift comprising the lift platform
according to the present invention emerge clearly from the above description, as do
the advantages.
[0058] In particular, the proposed lift platform has the typical advantages of platforms
with cabins (safety and visual pleasantness), combined with the benefits generally
associated with an open table, such as the use of a manually opening door that guarantees
compactness, lightness and reliability.
[0059] In particular, the proposed lift platform is versatile thanks to the possibility
of switching from automatic to manual sliding according to needs. The coexistence
of the double manoeuvre (automatic and manual) in the same lift platform allows safe
use in a range of circumstances and conditions, greater than that of known solutions.
[0060] In addition, the presence of the safety barrier and the emergency stop device make
it possible to comply with the safety criteria required by law. The use of an endless
screw sliding apparatus contributes to the simplicity of construction and the compactness
of the home lift.
1. Lift platform (1) comprising:
a cabin (2) slidable in a lift shaft (3), said cabin (2) having an entrance (4) where
it is mounted a door (5) that may be manually opened/closed;
means for detecting an open/close condition of the door (5);
a selector (7) for selecting the sliding of the cabin (2) in the lift shaft (3),
said selector (7) being configurable by a user in a first mode in which it enables
the automatic sliding of the cabin (2) in the lift shaft (3), and in a second mode
in which it enables the manual sliding of the cabin (2) in the lift shaft (3);
a safety barrier (8a, 8b) operatively active on said entrance (4) for detecting obstacles;
a control unit (6) configured in such a way that:
- in response to the detection of the close condition of the door (5) by said means
for detecting, the control unit (6) allows to configure the selector (7) in the first
mode,
characterised in that said control unit (6) is configured
- in such a way that in response to the detection of the open condition of the door
(5) by said means for detecting, the control unit (6) allows to configure the selector
(7) only in the second mode;
- to disable the sliding of the cabin (2) in response to the detection of the open
condition of the door (5) by said means for detecting and to the detection of obstacles
in proximity of the entrance (4) by said safety barrier (8a, 8b)
2. Lift platform (1) according to claim 1, wherein said safety barrier (8a, 8b) is a
photoelectric barrier comprising a first device (8a) configured to emit electromagnetic
radiations and a second device (8b) configured to receive the electromagnetic radiation
coming from the first device (8a).
3. Lift platform (1) according to claim 2, wherein said first device (8a) and said second
device (8b) are installed on opposed sides of the door (5).
4. Lift platform (1) according to any of the preceding claims, wherein said selector
(7) is a button wherein:
- the configuration of the first mode by the user is obtained by pushing said button
(7) once;
- the configuration of the second mode by the user is obtained by pushing continuously
said button (7).
5. Lift platform (1) according to any of the previous claims, wherein said door (5) is
a double-leaf door.
6. Lift platform (1) according to any of the claims 1 to 4, wherein said door (5) is
a folding door.
7. Lift platform (1) according to any of the previous claims, further comprising an emergency
stop device arranged near said selector (7) and manually activatable by the user to
stop the sliding of said cabin (2).
8. Home lift (100) comprising:
a lift platform (1) according to any of the previous claims;
an endless screw sliding apparatus (101) operatively active on the cabin (2) of said
lift platform (1) for activating the sliding thereof in the lift shaft (3).