JPS6345954Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a sliding device for the seat of a chair, especially for chairs whose legs are fixed to the floor. By pressing the front edge of the seat of the chair, the seat moves backwards in relation to the legs, and when sitting down, the front edge of the seat is again pressed lightly against the calves of the legs, thereby automatically moving the seat in relation to the legs. The object of the present invention is to provide a sliding device for the seat of a chair, which allows the user to easily sit down or stand up by moving the seat forward.

The present invention will be explained below based on the embodiment shown in the drawings.A base plate 1 fixed on the floor has a leg 2 erected on the upper end thereof, and consists of a bottom plate 4 and left and right side plates 3, 3'. The bottom plate 4 of the seat support plate 5, which is formed in an upward U-shape and has side plates 3 and 3' that are successively higher toward the rear, is fixed in a forward-inclined state.
Guide rollers 6, 6' are rotatably provided on the outer surfaces of the left and right side plates 3, 3'. A portion of the seat support plate 5 extending from the bottom to the top extends through the bottom plate 4 slightly toward one side of the bottom surface of the bottom plate 4, and has a tip extending from the left and right side plates 3,
A protruding shaft 7 located slightly above the upper edge of the protruding shaft 7 is provided, and a sleeve 8 for maintaining a distance is interposed between the rear end head 7' of the protruding shaft 7 and the lower surface of the bottom plate 4. , between the head 7' and the sleeve 8 is a locking piece 1 extending in the left-right direction and having a locking part 9 at the free end.
The base end of 0 is pivoted.

One end is pivotally connected to the bottom plate 4 via a shaft 11 between the locking piece 10 and the lower surface of the bottom plate 4, and
A lock arm 14 is provided, the other end of which extends to intersect with the locking piece 10 and protrudes from the front end of the bottom plate 4, and has a lock pin 12 extending upwardly secured to the other end by a nut 13. 14 is biased by a coil spring 15 provided between the leg 2 and the locking piece 10 in a normal state.
It is held in a state in which it is in contact with the locking part 9 of.

Above the seat support plate 5, there are left and right side plates 26, 2.
front and rear plates 16, which stand up so that 6' becomes higher toward the front and hang downward from the front and rear edges;
A main seat receiving plate 17 having a diameter of 16' is disposed, and a pair of guide rails are provided along the left and right sides of the lower surface of the bottom plate 18 and have a U-shaped longitudinal section and are parallel to each other and facing each other. Guide rollers 6 and 6' provided on the outer surfaces of both side plates 3 and 3' of the seat support plate 5 are rotatably engaged in the U-shaped portions of the members 19 and 19', respectively.
Thereby, the main seat support plate 17 is connected to the seat support plate 5 so as to be movable back and forth.

The main seat support plate 17 has a locking piece 21 having a recess 20 at the front end and a front half portion that overlaps the rear part of the locking piece 21 at the front position of the lower surface of the bottom plate 18 of the main seat receiving plate 17, and has a dogleg shape in plan view. A rocking piece 22 is provided, the rear half of which is bent so as to form a shape, and the rocking piece 22 is supported by a spring 24 so that the front end protruding piece 22' is normally held in contact with the fixing screw 23 of the locking piece 21. The oscillating piece 22 rotates against the spring 24 about the set screw 25 passing through the oscillating piece 22 and the locking piece 21, and the oscillating piece 22 rotates against the locking piece 21. The rear half of the machine is normally tilted and can be swung to become straight when in operation.

Note that 27 is a protruding shaft 7 passing through the seat support plate 5.
The spring 27 is a coil spring stretched between the upper end and the rear end of the main seat support plate 17, and the spring 27 is connected to cushions 28, 28' made of rubber or the like protruding from the front and rear ends of the seat support plate 5.
Of these, the cushion 28 provided at the rear end is the main seat receiving plate 1.
7 so as to come into contact with the rear plate 16'.

Further, a backrest portion 2 is provided on the upper surface of the main seat receiving plate 17.
A seat 30 is provided having a seat 9 and an armrest 29'.

In a normal state, the seat support plate 5 and the main seat support plate 17 are connected to the leg 2 so as to be movable back and forth.
are both installed in a forward-leaning state,
The seat portion 30 is held in a forward moved position, and in this state the user can sit deeply in the chair. When you stand up from this state, press the calf of your foot against the seat 3.
When the front end of the main seat plate 17 is pressed rearward, the main seat plate 17 moves rearward with respect to the seat plate 5 against the spring 27.
In this case, the rollers 6 provided on the seat support plate 5,
6' is located, the main seat support plate 17 moves smoothly relative to the seat support plate 5.

During this movement, the lock pin 12 provided at the tip of the lock arm 14 comes into contact with the rear half of the swing piece 22 provided on the lower surface of the main seat support plate 17, so that the lock arm 14 swings against the spring 15. In this case, the swinging piece 22 is pivoted at its intermediate portion, and the front end protrusion 22' is in contact with the fixing screw 23 of the locking piece 21 by the spring 24, so it does not swing, and the lock pin 12 does not swing. It moves in the direction of the arrow while being pushed up along the inclined upper edge of the rear half of the piece 22, and further moves while being guided by the upper edge of the locking piece 21. And the cushion 2 at the front end of the seat support plate 5
8' comes into contact with the front plate 16 of the main seat support plate 17, its movement stops, and when the calf of the foot releases the pressure on the seat 30, the main seat support plate 17 is moved forward by the spring 27. Since the lock arm 14 is also urged by its spring 15, the lock pin 12 is urged to protrude by the spring 15.
The restoring force automatically engages the recess 20 of the locking piece 21, and the seat 30 is held in a rearwardly moved state. In this case, since a protruding piece 31 is provided on the inner surface of the front plate 16 of the main seat receiving plate 17, the lock pin 1
2 engages with the inside of the recess 20 of the locking piece 21 more reliably. That is, the seat section 30 operates from the forward state shown in FIG. 3 to the retracted state shown in FIG. 4.

Next, when you sit down from this state, if you push the seat part 30 backwards again with the calf of your foot, the main seat support plate 17 will move slightly against the spring 27, and this movement will cause the lock pin 12 of the lock arm 14 to move. is removed from the recess 20 of the locking piece 21, the lock arm 14 is rotated by the spring 15, the lock pin 12 reaches below the locking piece 21, and the lock arm 14 is moved from the free end of the locking piece 10. It is held in a state in which it is in contact with the locking part 9. Therefore, the main seat support plate 17 in the forward tilted state is again guided by the guide rollers 6, 6' and moved forward together with the seat 30 with respect to the seat support plate 5 by its own weight and by the reinforcing force of the spring 27. The cushion 28 at the rear end of the seat support plate 5 is connected to the main seat support plate 1.
Its movement is stopped when it comes into contact with the rear plate 16' of No. 7. During this movement, the lower edge of the rear half of the swing piece 22 swings upward against the spring 24 due to the lock pin 12 projecting into the movement range of the lock pin 12, so that the movement of the lock pin 12 is not blocked.

By configuring this idea as described above,
When the user stands up, the seat can be held in a backward position by pressing the front end of the seat with the calf of the foot, and when the user sits down from this position, by lightly pressing the front end of the seat again, Since the seat can be moved to the forward position again, it is easy to stand up and sit down, and when you sit down, you can sit down deep, so there is no need to sit up again, and the movements are light. Moreover, according to the present application, since the lock pin and the rocking piece are each constantly biased, there is no risk of malfunction due to external vibration or impulse force, and reliable operation can be expected. .

[Brief explanation of the drawing]

The drawings show an embodiment, and Fig. 1 is a side view showing the whole, Fig. 2 is a side view of the main part with a part cut away, Fig. 3 is a bottom view in normal state, and Fig. 4 is the same as Fig. 3. It is a bottom view when it moves. In the drawing, 1 is a base, 2 is a leg, 3, 3',
26, 26' are side plates, 5 is a seat plate, 6, 6' are guide rollers, 10 is a locking piece, 12 is a lock pin, 1
4 is the lock arm, 17 is the main seat plate, 19,1
9' is a guide rail member, 20 is a recess, 21 is a locking piece,
22 is a swinging piece, 29 is a backrest portion, and 30 is a seat portion.

Claims (1)

[Scope of utility model registration request] A seat plate is provided on the legs that stand on the floor in a forward-leaning state, and a main seat plate is installed on the top of the seat plate so that it can be moved in the front and back direction. At the same time, when the main seat receiving plate moves to the rear position, both plates are locked in that state, and when the main seat receiving plate moves further rearward from this state, the main seat receiving plate is moved to the rear position. A locking mechanism for releasing the locked state is provided, and the locking mechanism is provided with a lock pin that is provided on the seat support plate so as to be swingable in the left and right directions and is always biased in one direction, and a main body. A locking piece is provided on the seat support plate and has a concave portion at its tip with which the lock pin engages when the locking piece is moved backward, and a locking piece is rotatably provided on the main seat support plate and is always pressed in one direction. In the process of moving to the rear position, the main seat receiving plate acts on the locking pin, swings it in a direction that resists the urging force, and guides it into the recess of the locking piece. In the process of the main seat receiving plate moving to the forward position, it is constituted by an oblique rocking piece that acts on the long pin and rotates in a direction that resists the elastic force, thereby allowing movement of the lock pin. A sliding device for a seat in a chair featuring: