TECHNICAL FIELD
[0001] This invention is related to the field of door closing systems, e. g., those used
in doors of residential or commercial buildings, and more particularly, to the devices
which are in charge of providing a hold open functionality to those systems.
STATE OF THE ART
[0002] Automated door closing systems are used to make a door close automatically when it
has been opened. These systems are usually based on a spring which stores energy when
the door is being opened and exerts a return force to close the door.
[0003] Some extra functionalities are often provided with these door closers. The ability
to keep the door open in a predetermined angle is often required by some manufacturers.
This functionality is often provided by a device which retains an element which is
associated with the door bar.
[0004] Document
US 5,461,754 A discloses a door closer comprising a detent and a slide element. The slide element
slides along a guide until contacting the detent. The detent comprises retention means
to hold the slide element in position, thus holding the door open. The retention force
is overcome by tugging the door.
[0005] These systems rely on cams or springs, and the tugging movement causes a sudden and
often unpleasant noise, due to the disengagement of the retention element.
[0006] An alternative solution for this problem is therefore sought.
SUMMARY OF THE INVENTION
[0007] The invention provides an alternative solution for providing a hold open functionality
by a hold open device according to claim 1 and a door assembly according to claim
9. Preferred embodiments of the invention are defined in dependent claims.
[0008] Unless otherwise defined, all terms (including technical and scientific terms) used
herein are to be interpreted as is customary in the art. It will be further understood
that terms in common usage should also be interpreted as is customary in the relevant
art and not in an idealised or overly formal sense unless expressly so defined herein.
[0009] In this text, the term "comprises" and its derivations (such as "comprising", etc.)
should not be understood in an excluding sense, that is, these terms should not be
interpreted as excluding the possibility that what is described and defined may include
further elements, steps, etc.
[0010] In a first inventive aspect, the invention provides a hold open device for a door
assembly, the hold open device comprising
a guide intended to be installed in a door frame;
a detent attached to the guide; and
a sliding element intended to receive an end of a door arm, the sliding element being
arranged to slide along the guide according to a sliding direction;
wherein
the sliding element comprises an engaging element and a biasing element arranged to
bias the engaging element with a biasing force according to a first direction;
the detent comprises a cavity configured to house at least a portion of the engaging
element and further comprises an absorber element, the absorber element being configured
to exert a reaction force when pressed, the reaction force being lower than the biasing
force;
the first direction is the direction to keep the engaging element in the cavity when
the engaging element enters the cavity.
[0011] The sliding element is intended to slide along the guide while the door is being
open or closed. When the door reaches a predetermined opening angle, the detent retains
the engaging element of the sliding element in its cavity. But to make this movement
smoother, the absorber element advantageously dampens the movement of the engaging
element, so that it enters the cavity softly. This lessens the tugging force to get
the door closed again and also the noise caused by this disengagement.
[0012] In some particular embodiments, the detent comprises a ramp configured to guide the
engaging element from the guide towards the cavity.
[0013] This ramp makes the movement of reaching the cavity easier, so there is no sudden
force to apply when the sliding element reaches the cavity.
[0014] In some particular embodiments, the engaging element is a pin comprising a pin axis
perpendicular to the sliding direction and substantially perpendicularly to the first
direction. A pin is an advantageous element to match with a cavity. A transverse pin
as comprised in these embodiments provides a smooth sliding movement, may be easily
biased and provides a suitable surface to be kept in the cavity. The relation between
the diameter of the pin and the size of the cavity may be tuned for a finer choice
of the device behaviour.
[0015] In some particular embodiments, the sliding element comprises a guide slot for the
pin, the guide slot being configured to guide the pin when biased by the biasing element.
[0016] This guide slot limits the movement of the pin, so that it may not be pushed out
of control by the biasing element.
[0017] In some particular embodiments, the absorber element comprises a cantilever portion
attached to a fixed body, so that the reaction force is provided by the elastic flexion
of the cantilever portion.
[0018] This cantilever portion may be designed to provide a tailored reaction force, which
is chosen as a function of the biasing force, also taking into account the features
required by the door manufacturer.
[0019] In some particular embodiments, the cavity comprises a main slot and at least a portion
of the absorber element is introduced in the main slot.
[0020] The position of at least a portion of the absorber element between two portions of
the cavity improves the stability of the engaging element when introduced in the cavity.
[0021] In some particular embodiments, the absorber element comprises a spring which provides
the reaction force.
[0022] This spring may be also chosen to provided the required reaction force.
[0023] In some particular embodiments, the biasing element of the sliding element is a leaf
spring crossed by a bolt.
[0024] A leaf spring is a good option for this element, since it takes little room in the
biasing direction, and a very fine biasing force choice is not usually required.
[0025] In a second inventive aspect, the invention provides a door assembly comprising
a hold open device according to the first inventive aspect;
a door frame, the guide being arranged in this door frame; and
a door comprising a door arm which is pivotally attached to the sliding element.
[0026] The door of this door assembly may be hold open in a predetermined position and then
be closed again avoiding unpleasant noises and with an easily modulated tugging force.
BRIEF LIST OF DRAWINGS AND REFERENCE NUMBERS
[0027] To complete the description and in order to provide for a better understanding of
the invention, a set of drawings is provided. Said drawings form an integral part
of the description and illustrate an embodiment of the invention, which should not
be interpreted as restricting the scope of the invention, but just as an example of
how the invention can be carried out. The drawings comprise the following figures:
Figure 1 shows a first embodiment of a door assembly according to the invention.
Figure 2 shows a detailed description of a sliding element belonging to the hold open
device according to the invention.
Figure 3 shows a detailed description of a detent belonging to the hold open device
according to the invention.
Figures 4a to 4c show different stages in the movement of the elements of the hold
open device according to the invention, while a door opening process is taking place.
[0028] Elements of the example embodiments are consistently denoted by the same reference
numerals throughout the drawings and detailed description where appropriate:
- 1
- Hold open device
- 2
- Guide
- 3
- Detent
- 4
- Sliding element
- 41
- Guide slot
- 5
- Pin (engaging element)
- 6
- Biasing element
- 7
- Cavity
- 71
- Main slot
- 8
- Absorber element
- 81
- Cantilever portion
- 82
- Fixed body
- 9
- Ramp
- 10
- Door assembly
- 11
- Door frame
- 12
- Door
- 13
- Door arm
- a
- Axis of the pin
- d
- First direction
- sd
- Sliding direction
DETAILED DESCRIPTION OF THE INVENTION
[0029] The example embodiments are described in sufficient detail to enable those of ordinary
skill in the art to embody and implement the systems and processes herein described.
It is important to understand that embodiments can be provided in many alternate forms
and should not be construed as limited to the examples set forth herein.
[0030] Accordingly, while embodiment can be modified in various ways and take on various
alternative forms, specific embodiments thereof are shown in the drawings and described
in detail below as examples. There is no intent to limit to the particular forms disclosed.
On the contrary, all modifications, equivalents, and alternatives falling within the
scope of the appended claims should be included.
[0031] Figure 1 shows a first embodiment of a door assembly 10 according to the invention.
This door assembly 10 comprises
a hold open device 1;
a door frame 11,
a door 12 comprising a door arm 13.
[0032] The hold open device 1 is in charge of providing some hold open functionality to
the door 12. To achieve this aim, the hold open device comprises, as seen in this
figure, a guide 2 and a sliding element 4 which is arranged to slide along the guide
2 according to a sliding direction sd. This sliding element 4 is pivotally attached
to the door arm 13 so that when the door 12 opens and closes, the door arm 13 joins
a point of the door 12 with the sliding element 4. Since the position of this point
changes while the door turns, and the door arm 13 has a fixed length, the sliding
element 4 is forced to slide along the guide 2 to meet the boundary conditions.
[0033] The guide 2 is arranged in the door frame 11 to keep the hold open device 1 as concealed
as possible.
[0034] The hold open device also comprises a detent 3 which is attached to the guide 2 and
provides a stable position for the sliding element 4 corresponding to a predetermined
opening angle of the door 12. When the sliding element 4 reaches the detent 3, it
may be kept in this position if the door is set free.
[0035] Figure 2 shows a detailed description of a sliding element 4 belonging to the hold
open device 1 seen in the previous figure.
[0036] This sliding element 4 comprises a pin 5 and a biasing element 6, which in this case
comprises a leaf spring crossed by a bolt. This biasing element 6 is arranged to bias
the pin 5 with a biasing force according to a first direction d.
[0037] The pin 5 comprises a pin axis a which is perpendicular to the sliding direction
sd and substantially perpendicularly to the first direction d. It is thus arranged
transversally to the sliding direction.
[0038] The sliding element 4 comprises a guide slot 41 for the pin 5, thus providing a vertical
guidance for the pin 5, so that it may move along the guide slot 41 when is biased
by the biasing element 6.
[0039] When the sliding element 4 moves along the guide (which is not represented in this
figure), the biasing element 6 pushes the pin 5 upwards, so that the pin slides in
contact with the upper wall of the guide.
[0040] Figure 3 shows a detailed description of a detent 3 belonging to the hold open device
1 seen in figure 1.
[0041] This detent 3 comprises a cavity 7, an absorber element 8 and a ramp 9.
[0042] The cavity 7 is configured to house at least a portion of the pin. When the sliding
element approaches the detent 3, the pin first encounters the ramp 9. This ramp 9
is intended to guide the pin towards the cavity 7.
[0043] The absorber element 8 comprises a cantilever portion 81 attached to a fixed body
82. The cantilever portion 81 is introduced inside a main slot 71 in the middle of
the cavity 7, and stands out from this main slot 71. As a consequence, the cantilever
portion 81 is arranged to receive the pin 5 when it arrives at the cavity 7.
[0044] Figures 4a to 4c show different stages in the movement of the elements of the hold
open device according to the invention, while a door opening process is taking place.
[0045] Figure 4a shows a first stage in this process. The sliding element 4 slides along
the guide 2 and approaches the ramp 9. The biasing element 6 will bias the pin 5 against
the ramp 9.
[0046] Figure 4b shows the next stage in this process. The sliding element continues towards
the cavity 7, but the cantilever portion 81 of the absorber element receives the pin
5 first. The biasing element 6 bias the pin 5 against the cantilever portion 81 of
the absorber element. This biasing force flexes the cantilever portion 81, so that
the absorber element provides a reaction force in a direction opposite to the biasing
force. This softens the movement of the pin 5, avoiding sudden noises.
[0047] Figure 4c shows a final stage in this process. While the sliding element is approaching
the final position in the cavity, the cantilever portion 81 flexes and allows the
pin 5 to be housed in its final position inside the cavity. The pin 5 is then installed
in the hold open position, and is kept in this position by the biasing force, which
bias the pin 5 towards the stable position in the cavity, but it has arrived there
without sudden or unpleasant noises. The tugging will be performed in a similar sense.
The reaction force of the cantilever portion 81 of the absorber will help a smooth
transition for the pin 5 just after exiting the cavity, so that the process of closing
the door does not comprise any sudden or unpleasant noises.
1. Hold open device (1) for a door assembly (10), the hold open device (1) comprising
a guide (2) intended to be installed in a door frame (11);
a detent (3) attached to the guide (2); and
a sliding element (4) intended to receive an end of a door arm, the sliding element
(4) being arranged to slide along the guide (2) according to a sliding direction (sd);
wherein
the sliding element (4) comprises an engaging element (5) and a biasing element (6)
arranged to bias the engaging element (5) with a biasing force according to a first
direction (d);
the detent (3) comprises a cavity (7) configured to house at least a portion of the
engaging element (5) and further comprises an absorber element (8), the absorber element
being configured to exert a reaction force when pressed, the reaction force being
lower than the biasing force;
the first direction (d) is the direction to keep the engaging element (5) in the cavity
(7) when the engaging element enters the cavity.
2. Hold open device (1) according to claim 1, wherein the detent (3) comprises a ramp
(9) configured to guide the engaging element (5) from the guide (2) towards the cavity
(7).
3. Hold open device (1) according to any of the preceding claims, wherein the engaging
element (5) is a pin comprising a pin axis (a) perpendicular to the sliding direction
(sd) and substantially perpendicularly to the first direction (d).
4. Hold open device (1) according to claim 3, wherein the sliding element (4) comprises
a guide slot (41) for the pin, the guide slot (41) being configured to guide the pin
(5) when biased by the biasing element (6).
5. Hold open device (1) according to any of the preceding claims, wherein the absorber
element (8) comprises a cantilever portion (81) attached to a fixed body (82), so
that the reaction force is provided by the elastic flexion of the cantilever portion
(81).
6. Hold open device (1) according to any of the preceding claims, wherein the cavity
(7) comprises a main slot (71) and at least a portion of the absorber element (8)
is introduced in the main slot (71).
7. Hold open device (1) according to any of the preceding claims, wherein the absorber
element (8) comprises a spring which provides the reaction force.
8. Hold open device (1) according to any of the preceding claims, wherein the biasing
element (6) of the sliding element (4) is a leaf spring crossed by a bolt.
9. Door assembly (10) comprising
a hold open device (1) according to any of the preceding claims;
a door frame (11), the guide (2) being arranged in this door frame (11)
a door (12) comprising a door arm (13) which is pivotally attached to the sliding
element (4).