JPH0223173Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a joint device that adjusts two frames constituting a folding part of a folding chair, bed, etc. to an arbitrary angle and fixes them at the angle position.

Conventional joint devices of this type include, for example,
As shown in No. 16156, No. 42-20400, No. 45-31331, etc., a gear part is provided at the connection part of one frame, and a gear part is provided at the connection part of the other frame in one rotation direction with respect to the gear part. It is common to have a ratchet that only engages with each other, and a free cam that creates a disengaged state under a certain posture interposed in this engagement part. According to such a joint device,
For example, one frame can be rotated in the raising direction, but cannot be rotated in the lowering direction due to the engagement of the ratchets, so that the posture of one frame raised to the desired position is maintained. However, when returning from this raised position to a more reclined position,
Once the frame is raised to a position beyond the meshing area between the ratchet and the gear part, the ratchet is aligned with the circumferential surface of the free cam to release the mesh, and after folding the frame in this state, it is raised again to the desired position. This requires a tedious operation. In addition, in the above structure, the human body load on the frame is supported only by the tooth profile of the gear part and the meshing of the ratchet, so there is a problem in terms of support strength, which is likely to cause failure, and furthermore, the frame is easily moved to one side, for example, the pulling side. Since it is rotatable, it is easy to deviate from the set angular posture when external force such as vibration is applied during use, and there is also a problem in maintaining the stability of the posture.

This idea was made in order to eliminate the above-mentioned drawbacks of the conventional methods.The frame can be easily changed in both up and down directions from the set position, and the set position is completely fixed and stable, and the support strength is large. The purpose is to provide a joint device that is less prone to failure.

An embodiment of this invention will be described below based on the drawings.

The drawing shows a chair configured such that the angle of the back part 2 relative to the seat part 1 can be arbitrarily set and fixed at that angle by pressing the pressing part 4 of the joint device 3 provided on one side. The seat frame 5 constituting the seat part 1 and the back frame 6 constituting the back part 2 are both made by bending a round pipe material 7 into a substantially U-shape, and forming both side parts 7a, 7a.
It has a structure in which a reinforcing pipe 8 is installed between them, and the corresponding ends 5a and 6a are connected via the joint device 3, and the corresponding ends 5b and 6b are connected via the pivot pin 9. are pivotally connected.

Next, the structure of the joint device 3 will be explained. That is, a sliding contact plate 10 having a substantially disc-shaped tip is fixed to the end 6a of the back frame 6 by welding or the like.
0 has an insertion hole 12 for a bolt 11 in the center, and a large number of through holes 13, 13, . . Furthermore, a sliding contact plate 15 having a generally disc-shaped tip and having a through hole 14 for a bolt 11 in the center is similarly fixed to the end portion 5a of the seat frame 5 by welding or the like, and the peripheral portion of this sliding contact plate 15 is fixed to the end portion 5a of the seat frame 5. has an insertion hole 14
Two openings 16 along the circumferential direction centered on
16 and substantially hemispherical projections 17, 17, . Each opening 16 and each protrusion 17 of this sliding contact plate 15 is provided at a position opposite to each through hole 13 of the sliding contact plate 10, respectively. The sliding contact plates 10 and 15 are arranged so that the sliding contact plate 10 is located inside the seat, are overlapped concentrically, and are connected to each other by bolts 11 passing through the insertion holes 12 and 14. The washer 19, which is rotatably connected and is located below the nut 18 screwed onto the bolt 11, and the inner surface of the sliding plate 10 are pressed together by a push spring 20 externally fitted onto the bolt 11. is urged to do so. In this overlapping state of both sliding contact plates 10, 15, each of the protrusions 17, 17... is fitted into the through hole 13, and each of the openings 16, 16 is also fitted into the through hole 13.
It is located in a position that communicates with 3.

On the other hand, a stopper pin 22, 22 protruding toward the sliding contact plate 15 is fixed to one end 21a bent inward, that is, toward the sliding contact plate 15, of the bolt 11, and a screw 23 is screwed to the other end 21b. A substantially rectangular operating lever 21 equipped with a coil spring 24 is
The ear-like mounting pieces 21c, 21c on both sides of the center are fitted onto the head 11a of the bolt 11 and are rotatably attached via a pivot pin 25 passing through them. Therefore, the operation lever 21 is pressed by the coil spring 24 so that the stopper pins 22, 22 are moved to the openings 16, 1 of the sliding contact plate 15 in the non-operated state.
6 and is configured to fit into the through holes 13, 13 of the sliding contact plate 10. 26 is the operating lever 21
A cover made of synthetic resin molding or the like is fitted to cover the entire part, and is responsible for improving the appearance and safety of the joint device 3 as a whole. Further, reference numeral 27 denotes an operating cover piece made of a synthetic resin shape attached to the end 21b of the operating lever 21, which fits into the notch 26a of the cover 26 and is exposed to the outside to constitute the pressing part 4. ing.

In the above configuration, in the non-operating state, both sliding contact plates 10, 15 are mutually connected to each other by the stopper pins 22, 22 of the operating lever 21 passing through the openings 16, 16 and the through holes 13, 13 communicating therewith. Although it is in an unrotatable state, by pressing the end 21b of the operating lever 21 against the bias of the spring 24, the stopper pins 22, 22 are released from the through holes 13, 13, and both sliding contact plates 10 , 15 can be rotated relative to each other by an external force that resists the urging force of the push spring 20.

Therefore, in order to adjust the angle of the back part 2 of the chair with respect to the seat part 1, it is sufficient to simply press the pressing part 4 of the operating lever 21 and rotate the back part 2 to a desired angle. However, the rotation operation of the lever is possible in either the front or back direction, and the through holes 13, 13, . . .
Each angular step determined by the arrangement interval and the number of arrangement can be arbitrarily selected. In addition, during this rotation operation process, all the protrusions 17, 17... fit into the through holes 13 at each angle step, and this is sensed by the operator as a response, making it easy to accurately determine the setting position. be. Further, in order to fix the back part 2 at the set position, it is only necessary to stop pressing the operating lever 21, and as a result, the stopper pins 22, 22 are automatically passed through the holes 16, 16 by the bias of the spring 24, and the through hole 1.
3 and 13, and the back part 2 cannot be rotated in either the front or rear direction. Therefore, if the user shakes the
Even if external force is applied due to contact with other objects, the set position will not shift, and the load such as human body weight will be applied not only to the stopper pins 22, 22 but also to all protrusions 1.
Since the parts 7, 17... and the through holes 13, 13... are supported at the fitting portions thereof, the support strength is large and failures are less likely to occur.

In the above embodiment, the operating lever 21 is connected to the bolt 1.
Although it is attached to the sliding contact plate 15, it is also possible to attach it to the sliding contact plate 15. Alternatively, the number of stopper pins 22 may be one, and the number of openings 16 in the sliding contact plate 15 may be one.
Furthermore, the number and angle of arrangement of the through holes 13, 13... and the protrusions 17, 17... can be variously changed depending on the desired angle adjustment stage of the back part 2, and the number and arrangement angle of the through holes 13, 13... and the protrusions 17, 17... can be changed in various ways according to the desired angle adjustment stage of the back part 2. may be arranged in the circumferential direction.

On the other hand, although the above embodiment describes a seat chair, this invention can be similarly applied to various other foldable chairs, beds, etc.

As described above, according to the joint device for a folding chair or the like according to the present invention, the angle of the two frames constituting the folding part of the main body can be easily adjusted in both rotational directions. There is no need to raise and return the frame to change the position from the set position to the tilted side, and since the set position is completely fixed, there is no risk of the set position shifting due to vibration etc. In addition, excellent effects such as high support strength and low failure resistance are achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the joint device according to this invention, in which Figure 1 is a perspective view of the entire seat, Figure 2 is a perspective view showing its frame structure, and Figure 3 is an exploded perspective view of the joint device. Figures 4 and 4 are sectional views of essential parts of the overlapping portion of the sliding contact plates, and Figure 5 is a perspective view showing the joint device and its cover. 1... Seat part (folding part), 2... Back part (folding part) 3... Joint device, 5... Seat frame, 5
a... End (connection part), 6... Back frame, 6a
...End part (connection part), 10...Sliding contact plate, 11...
Bolt (pivot), 12...insertion hole, 13...through hole,
15...Sliding contact plate, 16...Opening hole, 17...Protrusion,
20... Pressing spring, 21... Operating lever, 22...
...stopper pin, 24...coil spring.

Claims (1)

[Scope of utility model registration request] Sliding plates provided at each connecting part of the two frames constituting the folding part of the main body are superimposed on each other under the urging of a spring force, and are rotatably and slidably connected by a pivot passing through both, One sliding contact plate has a plurality of through holes at predetermined intervals in the circumferential direction centering on the insertion hole of the pivot shaft, and the other sliding contact plate has a plurality of through holes opened in the same circumferential direction. Projections that fit into the communicating holes and the remaining through holes are formed, and by fitting into the through holes of one sliding contact plate through the openings of the other sliding contact plate, rotation of both sliding contact plates is performed. An operating lever is provided with a stopper pin that prevents the sliding contact and enables the rotating sliding contact by separating from the through hole, and the operating lever is arranged in a direction in which the stopper pin is inserted into the through hole. Joint devices such as folding chairs that are biased by spring force.