JPH0248243B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a work chair, and more particularly, the vertical movement of the backrest and the change from the horizontal position to the vertical position of the seat are separately controlled. The present invention relates to a working chair that is equipped with a fixing means that allows the user to perform the work while also fixing the seat part at an appropriate and necessary position.

(Prior art and its problems) The present inventor has already devised a work chair in which the seat part can be changed from a horizontal position to a vertical position in conjunction with the vertical movement of the back part, and has filed an application for registration of a utility model. (Jitko No. 57-33820, Jitko No. 57-33821).

FIG. 1 is a schematic diagram showing the mechanism of the working chair. A movable member 3 with a fixed backrest 2 is provided along a vertically erected support column 1 so as to be movable up and down.
and a lower arm 6 pivoted to the fixed member 5 constitute a two-bar link. A seat portion 7 is provided on the upper arm 4 of this two-bar link. FIG. 1a shows the seat part 7 in a horizontal position, and the backrest part 2 is provided so as to be positioned at an appropriate position for the operator. On the other hand, when the worker tries to sit down on his/her back, the movable member 3 is moved upward.
The seat part 7, which is interlocked with the seat part 7, is tilted.

For example, the height of the seat 7 when placed in a horizontal position and the depth of the seat 7 are each set to 40 cm, while the height to the worker's knees and the length from the knees to the waist are set to 40 cm. Therefore, in the case where the seat part 7 is placed in a horizontal position as shown in FIG. The latter is located about 7 cm higher than the former. Therefore, due to the inclination of the seat, the position of the back rest relative to the worker changes each time, and the back rest cannot be set at a suitable position on the back of the worker. Additionally, in order to fold the work chair, the movable member must be slid upward along the support column, and the two-bar link connected to the bottom of the movable member must be extended vertically, making the work chair quite tall. Become. Therefore, the support columns must be long, occupying a considerable amount of space, and when the worker wants to sit down again, the movable member must be pulled down, which is cumbersome. It has drawbacks.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a work chair in which the level of the seat part can be adjusted while sitting, and the position of the backrest part can be adjusted.

(Means for solving the problems) The present invention has been made to solve the above problems,
It has the following configuration.

That is, a movable member is provided that is guided in the vertical direction along a support column, a back rest is provided on the upper part of the movable member, and the backrest portion is fitted onto the movable member or the movable member and is slidable along the movable member. an upper arm having one end pivotally attached to a sliding member; and a lower arm having one end pivotally attached to a sliding member that can be fitted onto and fixed onto the support column, at each other end thereof. A seat is provided on the upper arm of the two-bar link, and a seat part is provided on the upper arm of the two-bar link or at the tip of one of the lower arms of the two-bar link. A circularly arranged fitting part is provided, and one end of the other arm is rotatably attached to the shaft through a slit provided in the axial direction, and the fitting part is moved toward and away from the shaft. It is characterized by the provision of a lever for engaging and disengaging.

(Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In FIGS. 2 and 3, reference numeral 10 denotes a support column, which is vertically erected at a suitable position on the upper surface of the base 12. As shown in FIGS.

A movable member 14 is fitted onto the upper part of the support column 10 so as to be slidable along the support column 10. A backrest part 16 is fixed to the upper part of the movable member 14 so as to be tiltable.

A spring 17 is elastically loaded in the internal space between the support column 10 and the movable member 14, and constantly urges the movable member 14 upward. Note that this biasing force is not limited to the spring 17, but the internal space may be formed airtight and filled with an appropriate gas.
It may be possible to utilize this gas pressure.

Reference numeral 18 denotes a fixing member that is loosely fitted to the lower part of the support column 10, and below it is a stopper 22 that is also loosely fitted onto the support column 10 and fixed at an appropriate position on the support column 10 by a screw punch 20. By coming into contact with the upper surface, downward movement on the support column 10 is restricted. The screw punch 20 is screwed into a screw hole provided on the wall of the stopper 22, and its tip is attached to the support column 1.
The stopper 22 is fixed on the support column 10 by abutting the outer surface of the stopper 22. Reference numeral 24 designates a screw punch similar to that described above provided on the fixed member 18, and by tightening the screw punch, rotational movement of the movable member 14 around the support column 10 is restricted. 48 is a screw rod formed in the same manner as the screw rods 20 and 24,
The screw rod 48 allows the movable member 14 to be fixed at a predetermined position on the support column 10, and the height of the backrest 16 can be adjusted.

27 is a short cylindrical sliding member fitted onto the movable member 14. One end of an upper arm 26, which has a U-shape with a downwardly open cross section, is pivoted to a bearing 28 protruding from the sliding member 27 so as to be rotatable in a vertical plane. Reference numeral 30 denotes a lower arm, and one end of the lower arm is rotatably attached to a bearing 32 protruding from the fixed member 18 in a vertical plane.

The upper arm 26 and the lower arm 30 are configured so that the shaft 34 is attached to the upper arm 26 by the bifurcated portions 30a, 30b at the tip of the lower arm 30 entering the extension portions 26a, 26b provided at the tip of the upper arm 26 and being attached to the shaft 34. It can be rotated freely around the center. The upper arm 26 and the lower arm 30 constitute a two-bar link.

The bifurcated parts 30a and 30b of the lower arm 30 are formed in an arc shape, and a gear blade 36 is formed in each of the arc parts. 38 is a lever for positioning;
A bearing 40 protrudes from the upper arm 26 at one end thereof.
It is rotatably pivoted on the upper arm 26 and loosely passes through vertical slits 42a and 42b provided near the bases of the extensions 26a and 26b of the upper arm 26. 44 is a coil spring, one end of which is fixed to the shaft 34 and the other end of which is fixed to the lever 38, urging the lever 38 downward; and by this urging force, the lever 38 is normally attached to the gear blade 3.
6, and the biting can be released by pulling up the tip of the lever 38 along the slits 42a, 42b against the biasing force.

The gear blade 36, the slits 42a, 42b, the lever 38, the coil spring 44, etc. constitute means for fixing the two-bar link.

Reference numeral 46 denotes a seat portion, which is fixed to the upper surface of the upper arm 26. The tip of the lever 38 is located close to the side edge of the seat 46 in the space below the seat 46, so that the operator can operate it while sitting.

This embodiment is configured as described above. Therefore, when the tip of the lever 38 is pulled upward as described above to release the lever 38 from biting into the gear blade 36, the sliding member 27 fitted onto the movable member 14 is moved by the two-bar link. Movable member 14
Can move up and down. When the lever 38 is released when the seat 46 is in the required tilted state, the lever 38 is biased by the coil spring 44 and bites into the gear blade 36, causing the upper arm 26 and lower arm 30 to rotate around the axis 34. movement is prevented, which causes the upper arm 2
6 and the lower arm 30 are fixed, and the seat portion 46
maintains the proper angle of inclination. Subsequently, the movable member 14 may be slid and fixed onto the support column 10 with the threaded rod 48 so that the back support portion 16 is placed at a suitable position on the back of the worker. Note that when the screw rod 24 is loosened, the sliding member 27 and the two-bar link become rotatable around the movable member 14, and the seat portion 4
6 can be used in any suitable rotational position relative to the support column 10.

(Effects of the Invention) As described above, according to the present invention, the inclination angle of the seat part can be adjusted so that the worker's lower back is raised while sitting, and the part of the back of the worker in the inclined position of the seat part can be adjusted. The movable member can be moved up and down to set the backrest to a suitable position. In addition, since the sliding member is provided on the movable member so that it can move up and down, the height of the work chair does not increase too much when folded, and the support column can be made short. play.

[Brief explanation of the drawing]

1A and 1B are schematic explanatory views of the conventional technology, FIG. 2 is an overall side view showing a preferred embodiment of the present invention, FIG. 3 is a side view showing the fixing means, and FIG. 4 is a front explanatory view thereof. It is. 1... Support column, 2... Back rest, 3... Movable member, 4... Upper arm, 5... Fixed member, 6... Lower arm,
7... Seat part, 10... Support column, 12... Base,
14...Movable member, 16...Back rest part, 17...
Spring, 18... Fixed member, 20, 24...
Screw rod, 26... upper arm, 26a, 26b... extending portion, 27... sliding member, 28... bearing, 30...
Lower arm, 30a, 30b... bifurcated part, 32... bearing, 34... shaft, 36... fitting part, 38... lever, 40... bearing, 42a, 42b... slit, 44... coil spring , 46... Seat part, 48... Screw rod.

Claims (1)

[Scope of Claims] 1. A movable member 14 guided in the vertical direction along the support column 10 is provided, a backrest portion 16 is provided on the upper part of the movable member 14, and a backrest portion 16 is provided externally on the movable member 14 or the movable member 14. a sliding member 1 that is freely slidable along the movable member 14;
an upper arm 26 having one end pivoted to the support column 1;
A lower arm 30, one end of which is pivoted to a sliding member 18 that can be fitted onto the support column 10 and fixed on the support column 10, is attached to a shaft 34 at each other end of the lower arm 30 so as to be rotatable relative to each other.
A joint link is provided, and a seat part 46 is provided on the upper arm 26 of the two-bar link, and a seat part 46 is provided on the upper arm 26 of the two-bar link or at the tip of one of the lower arms 30, and is arranged in a semicircular shape around the shaft 34. A fitting part 36 is provided, and slits 42a and 42b are provided in the other arm facing in the direction of the axis 34.
A working chair characterized by being provided with a lever 38 that extends through the shaft and is rotatably pivoted at one end, and that engages and disengages from the fitting portion 36 by moving toward and away from the shaft 34.