JP3813386B2 - Self-closing door device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a self-closing door device that automatically closes a door by a restoring torque generated by twisting a torsion bar.
[0002]
[Prior art]
Conventionally, self-closing doors are widely used in refrigeration and refrigeration equipment such as refrigerators and refrigerated showcases, and the effect of preventing leakage of cold air by opening the doors is exerted. In many cases, the torque for closing the door is generated by a restoring torque of a torsion bar (referred to as a torque rod here) twisted as disclosed in, for example, Japanese Patent Laid-Open No. 58-191878. .
[0003]
That is, in the above publication, the upper end of the torque rod is fixed to the door, and the hexagonal head at the lower end is engaged with the hexagonal opening of the worm wheel so as not to rotate. The door is turned in the closing direction by the restoring torque generated by the twist.
[0004]
Further, in the above publication, the worm wheel is rotated by a worm so that the torque of the torque rod can be adjusted, that is, the initial torque of the torque rod when the door is closed can be adjusted. Can be adjusted. As an initial torque adjusting device, there is a device using a ratchet.
[0005]
[Problems to be solved by the invention]
By the way, in this kind of self-closed door, the torsion bar is bent and deformed due to use over time, and accordingly, the engagement between the torsion bar and the torque adjusting device and the meshing of the ratchet are poor. Further, the torque adjusting device itself may vary in meshing of the ratchet and worm due to manufacturing errors.
[0006]
When the torsion bar is deformed and the meshing of the torque adjusting device itself is insufficient, the torque adjusting device runs idle even when the door is opened, and the torsion bar is not twisted. There arises a problem that the self-closing function is lost.
[0007]
The present invention has been made to solve the conventional technical problem, and an object of the present invention is to provide a self-closing door device that can maintain a self-closing function by a torsion bar even when used over time.
[0008]
[Means for Solving the Problems]
In the self-closing door device of the present invention, one side of the door in the vertical direction is pivotally supported on a frame by a hinge, one end is provided so as not to rotate with respect to the door, and the other end is rotated with respect to the frame. The door is automatically closed by the torsional torque of the immovable torsion bar, and is placed between both ends of the torsion bar, and is attached to the door by an elastic corrugated fixture provided on the lower side. An attached spacer and an insertion hole formed in the spacer are provided, and the torsion bar is inserted into the insertion hole of the spacer so as to be rotatable and movable in the longitudinal direction.
[0009]
According to a second aspect of the present invention, there is provided a self-closing door device comprising torque adjusting means for adjusting the torsion torque of the torsion bar in the above, and the spacer being displaced from the center in the longitudinal direction of the torsion bar toward the torque adjusting means. It is characterized by being.
[0010]
According to the present invention, one side in the vertical direction of the door is pivotally supported on the frame by the hinge, and one end is provided so as not to be rotatable relative to the door, and the other end is not rotatable relative to the frame. In the self-closing door device that automatically closes the door due to the torsional torque of the torsion bar, a spacer is arranged between both ends of the torsion bar, and the elastic corrugated fixture provided on the lower side attaches the door to the door. At the same time, an insertion hole is formed in the spacer, and the torsion bar is inserted into the insertion hole of the spacer so as to be rotatable and movable in the longitudinal direction. Therefore, the position of the torsion bar is regulated by this spacer, bending deformation, etc. Is prevented.
[0011]
Thereby, the inconvenience that the self-closing function is lost due to deformation of the torsion bar due to aging can be effectively solved. In particular, since the torsion bar is inserted into the insertion hole of the spacer so as to rotate and move in the longitudinal direction, there is no problem in twisting the torsion bar due to the rotation of the door.
[0012]
In addition, since the spacer is attached to the door with a corrugated fixture, the spacer can be easily removed and removed during replacement maintenance such as when the torsion bar breaks. Thereby, maintenance workability improves compared with the case where a spacer is attached with an adhesive or the like. Furthermore, when it is attached with an adhesive or the like, it becomes difficult to reuse, but since it is attached with a corrugated fixture, the spacer can be reused.
[0013]
In addition, if the spacer is displaced from the center in the longitudinal direction of the torsion bar toward the torque adjusting means, the idle rotation of the torque adjusting means due to the bending deformation of the torsion bar can be more effectively eliminated. Is possible.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a refrigerated showcase 1 to which the present invention is applied, and FIG. 2 is a perspective rear view of the torsion bar device 3 portion of the right door 7 toward the self-closing door device 2 of the present invention.
[0015]
The refrigerated showcase 1 includes a storage chamber 5 inside a heat insulating box 4 that opens forward, and is configured to supply cold air from a refrigeration apparatus (not shown) into the storage chamber 5 to maintain a predetermined low temperature. ing. The self-closing door device 2 of the present invention basically includes a frame-like aluminum frame 6 attached to the opening edge of the heat insulating box 4 and one side in the vertical direction (in the embodiment, each outside) on the frame 6. It comprises two doors 7 and 7 that are pivotally supported and the torsion bar device 3.
[0016]
Both the doors 7 and 7 are pivotally supported on the frame 6 in a so-called double door manner by an upper hinge 8 and a lower hinge 9 fixed to the frame 6, respectively. The opening direction can be changed by changing the other one side up and down and turning the door 7 upside down.
[0017]
The door 7 is composed of an aluminum sash 11, a double or triple multilayer glass 12, a handle 16, and the like. Note that the door 7 is configured to be vertically symmetrical so as to be reversed as described above.
[0018]
On the other hand, the torsion bar device 3 includes, for example, a torsion bar 18 made of a spring steel rod having a square shape with a cross section of 3.2 mm on one side, and a torque adjusting device (torque adjusting means) 19 attached to the lower end of the torsion bar 18. Etc.
[0019]
The torque adjustment device 19 is fixed to the lower end of the torsion bar 18 and has a cylindrical upper ratchet member 21 having a meshing tooth 21A around the lower edge and a wrench engagement hole (not shown) at the center, The lower ratchet member 22 has a meshing tooth 22A that meshes with the meshing tooth 21A, and has a through-hole in the vertical direction (not shown) inside, and a ratchet spring 23.
[0020]
In the upper and lower sides of the sash 11 to which the handle 16 of the door 7 is not attached (in the upper end of the upper and lower sides of the right side of the right door 7 and in the lower end of the upper and lower sides of the left side of the door 7 in the embodiment) ) Includes a storage space 26 having a rectangular cross section and extending vertically, and the front surface of the sash 11 is concealed in its entirety including the storage space 26 by a cover not shown in detail.
[0021]
Further, a stop plate 27 is fixed in a position spaced a predetermined distance from a corner portion of the sash 11 (an upper corner portion on the outside in the embodiment) in the inner portion of the storage space 26. A through hole 27A is formed in the center of the stopper plate 27. Further, the corner portion of the sash 11 (the upper corner portion on the outside in the embodiment) at the position where the stopper plate 27 is opposed is arranged at the upper portion. A hinge hole 28 in which the hinge 8 is rotatably inserted and engaged is formed. Note that the left door 7 is used by turning the right door 7 upside down. Therefore, in the case of the left door 7, the lower hinge 9 is inserted and engaged through the hinge hole 28. become.
[0022]
In addition, two aluminum spacers 31 are provided in the storage space 26 and are fixed to the sash 11 by resin corrugated fixtures 25 provided below them. The corrugated fixture 25 is provided below the spacers 31 along the inner wall of the rear side corresponding to the storage space 26 of the sash 11, for example. The storage space 26 is attached. Thereby, each spacer 31 is held from below. The corrugated fixture 25 may be positioned on the left and right inner walls of the sash 11. Further, a circular insertion hole 31 </ b> A is vertically formed in the center of each spacer 31.
[0023]
With the above configuration, the torsion bar device 3 is stored in the storage space 26 of the sash 11. In this case, the upper end portion of the torsion bar 18 is inserted into the upper hinge 8 from the storage space 26 side, and is fixed so as not to rotate and move up and down by a pin (not shown). As a result, the upper end of the torsion bar 18 is fixed to the frame 6 via the upper hinge 8.
[0024]
The torsion bar 18 is inserted into the insertion holes 31A and 31A of the spacers 31 and 31 so as to be rotatable and movable in the vertical direction (longitudinal direction). At this time, the lower spacer 31 is offset from the center C in the vertical direction (longitudinal direction) of the torsion bar 18 and is provided on the torque adjustment device 19 side. Is also arranged on the upper side.
[0025]
Further, a lower ratchet member 22 and a ratchet spring 23 are sequentially disposed below the upper ratchet member 21 attached to the lower end portion of the torsion bar 18, and the meshing teeth 22A of the lower ratchet member 22 are meshed with the meshing teeth of the upper ratchet member 21A. Engage with 21A. Further, a lower spring 24 is interposed between the ratchet spring 23 and the stop plate 27 in a compressed state.
[0026]
The torsion bar device 3 is held between the upper hinge 8 and the stop plate 27 by the restoring force of the lower spring 24. At this time, at least the lower end portion of the torsion bar 18 and the upper ratchet member 21 can rotate and move in the vertical direction within the storage space 26, but the lower ratchet member 22 can move in the vertical direction but cannot rotate. In this way, the sash 11 is engaged. Further, the ratchet spring 23 always urges and presses the lower ratchet member 22 toward the upper ratchet 21 in the direction.
[0027]
Here, in the example of FIG. 2, the meshing teeth 21A of the upper ratchet member 21 and the meshing teeth 22A of the lower ratchet member 22 are inclined on the right side as viewed from the outside, and the left side has a vertical shape. The ratchet member 21 can rotate counterclockwise with respect to the lower ratchet member 22 as viewed from above, but cannot rotate clockwise.
[0028]
When an initial torque is applied to the torsion bar device 3, a through hole (not shown) formed in a portion corresponding to the stopper plate 27 of the cover of the sash 11 (this through hole can be opened and closed by a separate cover). In this embodiment, a hexagon wrench is inserted into the through-hole 27A of the stopper plate 27 from below, and is engaged with the wrench engagement hole of the upper ratchet member 21, and the ratchet spring 23, lower The upper ratchet member 21 is rotated counterclockwise when viewed from above against the spring force of the spring 24. At this time, since the upper end portion of the torsion bar 18 is fixed to the upper hinge 8 so as not to rotate, only the lower end portion of the torsion bar 18 is rotated and twisted. As a result, a twisting torque is applied to the torsion bar 18. This twisting torque can be adjusted by the rotation angle of the upper ratchet member 21.
[0029]
In this state, when the handle 16 of the right door 7 is opened and opened, the lower ratchet member 22 of the torsion bar device 3 that is not allowed to rotate with respect to the sash 11 is viewed from above with respect to the upper hinge 8. It will be rotated counterclockwise. Here, since the upper ratchet member 22 cannot rotate clockwise with respect to the lower ratchet member 22 as viewed from above, the upper ratchet member 21 also rotates as the lower ratchet member 22 rotates.
[0030]
On the other hand, since the upper hinge 8 to which the upper end portion of the torsion bar 18 is fixed does not rotate, the torsion bar 18 is rotated and twisted counterclockwise as viewed from above only the lower end portion. The twisting restoring torque applies a torque in the closing direction to the door 7, and the door 7 automatically closes when the hand is released.
[0031]
When the torsion bar 18 is twisted, the vertical dimension is slightly shortened, so that the upper and lower ratchet members 21 and 22 try to be separated, but the engagement of both is maintained by the urging force of the ratchet spring 23 and the lower spring 24.
[0032]
Here, since the torsion bar 18 is inserted into the insertion holes 31A, 31A of the spacers 31, 31, the position of the torsion bar 18 in the storage space 26 is regulated by the positions of the insertion holes 31A, 31A. I can't stop. On the other hand, when used over time, the torsion bar 18 is bent and the vertical dimension is shortened, and the upper ratchet member 21 is lifted away from the lower ratchet member 22.
[0033]
At this time, if the shapes of the meshing teeth 21A, 22A of the upper and lower ratchet members 21, 22 are varied, the meshing of the upper and lower ratchet members 21, 22 becomes poor even by the urging force of the ratchet spring 23 and the like, and the door 7 However, according to the present invention, since the bending deformation of the torsion bar 18 itself is prevented by the spacers 31 and 31 as described above, such inconvenience does not occur.
[0034]
In particular, since the lower spacer 31 is offset from the center C of the torsion bar 18 toward the torque adjusting device 19, idle rotation of the upper and lower ratchet members 21 and 22 due to the bending deformation of the torsion bar 18 is more effective. To be resolved. Moreover, since the spacer 31 is attached in the sash 11 with the corrugated fixture 25, the spacer 31 can be easily removed and removed during replacement maintenance such as when the torsion bar 18 is broken. Thereby, maintenance workability improves compared with the case where the spacer 31 is attached with an adhesive agent. Further, when it is attached with an adhesive or the like, it becomes difficult to reuse, but in the embodiment, since it is attached with the corrugated fixture 25, the spacer 31 can be reused.
[0035]
In the embodiment, two spacers are provided in the upper and lower portions in the storage space 26. However, only one spacer below the center C is effective, and conversely, three or more spacers including the lower spacer are provided. May be. Moreover, you may use an elongate spacer in the up-down direction which comprised integrally the upper and lower spacers 31 and 31 shown in the Example.
[0036]
Furthermore, although the torque adjusting device using the upper and lower ratchet members is adopted in the embodiments, the present invention is not limited to this, and the present invention is also effective for a torque adjusting device using a worm wheel as described in the above publication.
[0037]
Furthermore, in the embodiment, one end of the torsion bar 18 is fixed to the frame 6 side, but one end of the torsion bar 18 is fixed to the door 7 side and the other end is provided so as to be rotatable and vertically movable with respect to the frame 6. Also good.
[0038]
【The invention's effect】
As described above in detail, according to the present invention, one side of the door in the vertical direction is pivotally supported on the frame by a hinge, one end is provided so as not to be rotatable with respect to the door, and the other end is provided on the frame. In a self-closing door device that automatically closes the door by the torsional torque of the torsion bar that is non-rotatable, spacers are arranged between both ends of the torsion bar, and the corrugated wave is provided on the lower side. The spacer is attached to the door, and an insertion hole is formed in the spacer, and the torsion bar is inserted into the insertion hole of the spacer so as to rotate and move in the longitudinal direction. Thus, bending deformation and the like are prevented.
[0039]
Thereby, the inconvenience that the self-closing function is lost due to deformation of the torsion bar due to aging can be effectively solved. In particular, since the torsion bar is inserted into the insertion hole of the spacer so as to rotate and move in the longitudinal direction, there is no problem in twisting the torsion bar due to the rotation of the door.
[0040]
In addition, since the spacer is attached to the door with a corrugated fixture, the spacer can be easily removed and removed during replacement maintenance such as when the torsion bar breaks. Thereby, maintenance workability improves compared with the case where a spacer is attached with an adhesive or the like. Furthermore, when it is attached with an adhesive or the like, it becomes difficult to reuse, but since it is attached with a corrugated fixture, the spacer can be reused.
[0041]
In addition, if the spacer is displaced from the center in the longitudinal direction of the torsion bar toward the torque adjusting means, the idle rotation of the torque adjusting means due to the bending deformation of the torsion bar can be more effectively eliminated. Is possible.
[Brief description of the drawings]
FIG. 1 is a perspective view of a refrigerated showcase as an embodiment to which the present invention is applied.
FIG. 2 is a perspective rear view of the torsion bar device portion of the right door toward the self-closing door device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Refrigerated showcase 2 Self-closing door device 3 Torsion bar device 6 Frame 7 Door 8 Upper hinge 9 Lower hinge 11 Sash 18 Torsion bar 19 Torque adjustment device 21 Upper ratchet member 22 Lower ratchet member 23 Ratchet spring 24 Lower spring 26 Storage space 27 Stop Plate 31 Spacer 31A Insertion hole

Claims (2)

One side of the door in the vertical direction is pivotally supported on a frame by a hinge, and one end is provided so as not to be rotatable relative to the door, and the other end is provided so as not to be rotatable relative to the frame. In the self-closing door device that automatically closes the door by the twisting torque of the torsion bar,
The torsion bar includes a spacer that is disposed between both ends of the torsion bar and is attached to the door by an elastic corrugated fixture provided on the lower side, and an insertion hole formed in the spacer. The self-closing door device is inserted into the insertion hole of the spacer so as to be rotatable and movable in the longitudinal direction.   2. A torque adjusting means for adjusting torsional torque of the torsion bar is provided, and the spacer is provided to be deviated from the center in the longitudinal direction of the torsion bar toward the torque adjusting means. Self-closing door device.

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