JPS6092705A - Working chair - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work chair, and more particularly, the present invention relates to a work chair, and more particularly, the backrest can be moved up and down and the seat can be changed from a horizontal position to a vertical position, respectively, and The present invention relates to a work chair provided with a fixing means that can fix the seat part at an appropriate position.

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 backrest part, and has filed an application for registration of a utility model.
No. 3820, Utility Model Publication No. 57-33821).

FIG. 1 is a schematic diagram showing the mechanism of the working chair. A movable member 3 to which a back rest 2 is fixed is provided so as to be movable up and down along a vertically erected support column 1, and an upper arm 4 which is pivoted to the lower part of this movable member 3 and a fixed member 5 are pivoted to each other. The attached lower arm 6 forms a two-bar link. A seat portion 7 is provided on the upper arm 4 of this two-bar link. Fig. 1 (al) shows the seat part 7 in a horizontal position, and the backrest part 2 is provided so that it is positioned at the appropriate position for the worker.On the other hand, when the worker tries to sit on the middle In this case, by moving the movable member 3 upward, the seat portion 7 interlocked with the movable member 3 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 4Q cm. Then, in the case where the seat part 7 is placed in a horizontal position as shown in Fig. 1+a), and in the case where the seat part 7 is tilted so that the worker sits on the middle of the floor as shown in Fig. 2 (bl), the backrest for the worker is 2 is located about 7 cm higher than the former. Therefore, due to the inclination of the seat, the position of the backrest relative to the worker changes each time, and the position of the back rest relative to the worker changes each time, so that it is placed at a suitable position on the worker's back. It has the disadvantage that the backrest cannot be set.Also, in order to fold the work chair, the movable member must be slid upward along the support column, and the two sections interlocked with the lower part of the movable member must be folded. Due to the vertical extension of the links, the height of the work chair is quite high.Therefore, the support columns must be set long, occupying a considerable amount of space, and when the worker wants to sit again. However, this method has drawbacks such as the need to pull down the movable member, which is cumbersome.

The present invention has been made in view of the above drawbacks, and an object of the present invention is to provide a work chair in which a backrest can be set at an appropriate position on the worker's back as the seat changes from a horizontal position to a vertical position. The feature is that a movable member is provided which is guided in the vertical direction along a suitable support member, a fixed member is provided below the movable member to fix vertical movement at an appropriate position, and a fixed member is provided below the movable member to prevent movement in the vertical direction. a back rest, a sliding member fitted over the movable member and guided vertically; an upper arm having one end pivoted to the sliding member; and a lower arm having one end pivoting to the fixed member. A two-bar link is provided in which the arms are rotatably connected to each other at their other ends, a seat is provided on the upper arm of the two-bar link, and a seat between the upper arm and the lower arm is provided at the connecting portion of the two-bar link. This is because a fixing means that can fix the opening angle to an arbitrary angle is provided.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

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

Reference numeral 14 is a movable member, which is fitted onto the upper part of the support column 10 so as to be able to freely slide along the support column 10 . A back rest 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 force is not limited to the spring 17, but the internal space may be formed airtight and filled with a suitable gas, and the pressure of this gas may be utilized.

Reference numeral 18 denotes a fixing member loosely fitted to the lower part of the support column 10, and a stopper 22 below which is loosely fitted onto the support column 10 and fixed at an appropriate position on the support column 10 by a threaded rod 20. Due to the contact, downward movement on the support column 10 is restricted. The screw rod 20 is screwed into a screw hole provided on the wall of the stopper 22, and its tip abuts against the outer surface of the support column 10, thereby fixing the stopper 22 on the support column 10. 24 is the number installed on the fixed member 18)
This is a threaded rod similar to the one described above, and by tightening it, rotational movement of the movable member 14 around the support column 10 is restricted. Numeral 48 is a screw rod provided similarly to the screw rods 20 and 24, which can fix the vertical movement of the movable member 14 with respect to the support column 10.

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. 30 is a lower arm, at one end of which a bearing 3 is provided protruding from the fixed member 18.
2 so that it can rotate freely in a vertical plane.

The upper arm 26 and the lower arm 30 are a bifurcated portion 30a at the tip of the lower arm 3o.
, 30b are extensions 26a, 26 provided at the tip of the upper arm 26.
By protruding into the interior of b and being attached to the shaft 34, it is rotatable around the shaft 34. This upper arm 26 and lower arm 3
o constitutes a two-clause link.

The bifurcated portions 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 portions. 3
Reference numeral 8 denotes a positioning lever 8, which is rotatably attached to a bearing 40 protruding from the upper arm 26 at one end thereof, and the upper lIf! 26, extending loosely through slits 42a and 42b in the upper and lower directions -J provided near the bases of the extending portions 26a and 26b. 44 is a coil spring, -i is fixed to the shaft 34 and the other end is /N-3
EH is fixed and urges the lever 38 downward. This force causes the Reno X-38 to bite into the gear blade 36 at all times, and the tip of the X-38 is pulled up against the biasing force by aligning with the slotted throats 42a and 42b. The gear blade 36, the slotted throats 42a and 42b, and the lever 3
B. The coil spring 44 and the like constitute a fixing means for the two-bar link 9''.

Reference numeral 46 denotes a seat portion, to which the upper surface G of the upper arm 26 is fixed. It is located close to the side edge of the seat 46 (standing upright) in the space below the tip (11 tJ) of the lever 38, so that the operator can operate it while sitting. It has become.

This embodiment is configured as described above. However,
When the tip of the lever 38 is lifted upward as described above to release the lever 38 from biting into the gear blade 36, the sliding portion jfA27 fitted onto the movable member 14 moves up and down on the movable member 14 by the two-bar link. It can move. When the lever 38 is released when the seat portion 46 is in the required inclined state, the leno\-38 is biased by the coil spring 44 and bites into the gear blade 36, and is centered around the shaft 34 of the upper arm 26 and lower arm 30. The opening angle between the upper arm 26 and the lower arm 30 is thereby fixed, and the seat portion 46 maintains an appropriate 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. In addition,
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 46 can be used in an appropriate rotational position with respect to the support column 10.

Further, the fixing means for the two-bar link in the above embodiment is not limited to the fixing means described above, and the following fixing means may be used.

As shown in FIGS. 5 to 7, 2X of the tip of the lower arm 30
The upper arm 26 is inserted into the upper arm 26 parts 30a and 30b. A portion 36 is formed and G is formed.

Reference numeral 50 denotes a positioning lever, which is rotatably mounted on the lower surface of the seat plate holder 52 for fixing the seat 91S 46, and has horizontal guide holes 54a in the extending parts 26a and 26b of the upper arm 26. , 54b, the tip of the reno \-50 is inserted into the elongated hole 5i of the two stopper plates 56 and 56, which are loosely penetrated through the hole 54b. 2 strike > no < against 56.56 (7) on the other hand (7) s) ・y /'C board 56 (7) against ($60
60 is biased by springs 62 and 62 into the fitting portion 36, and by rotating the lens <-50, the stopper plate 5 resists the biasing force G.
6.56 can move along the guide holes 54a and 54b to release the biting.

In addition, in order to prevent the opening angle of the two-bar link from being extremely narrow and the first part being pinched, the two-bar link may be biased in the opening direction by a spring 46. Further, the fitting portions 364 on the outside of the 2X portions 30a and 30b are used to allow the stopper plate 56 to bite into the two-bar link when extending it in the vertical direction and leaning on the seat portion 46.

In addition, since two stopper plates 56 and 56 of the same shape are provided so as to overlap, for one fitting part 36,
Two inclination angles can be set because the two stopper plates 56 and 56 correspond to each other and one of them bites. Therefore, 2
The number of fitting portions 36 formed in the X portions 36a, 36b can be reduced, and the strength will not be reduced. Even if the fixing means as described above is used as the fixing means for the two-bar link of the above embodiment, the same effects as described above can be obtained.

As described above, according to the present invention, it is possible to adjust the inclination angle of the seat so that the lower back of the worker can float while sitting on the seat, and also to adjust the angle of inclination of the seat so that the worker's back can be adjusted in the inclined position of the seat. The movable member can be moved up and down to set the backrest at 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.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of drawings]

1(a) and 1(b) are schematic explanatory views of the conventional method, 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 side view showing a preferred embodiment of the present invention. The front explanatory view and FIGS. 5 to 7 are side views, front explanatory views, and plan explanatory views showing other fixing means. l...Support column, 2...Backrest part, 3...Movable member, 4...Upper arm, 5...Fixed member, 6...Lower arm, 7
...Seat part. DESCRIPTION OF SYMBOLS 10... Support pillar, 12... Base, 14... Movable member, 16... Back rest part, 17... Spring, 1
B...Fixing member, 20°24...Screw rod 2, 26.
... Upper arm, 26a. 26b...extending portion, 27...sliding member. 28...Bearing, 30...Lower arm, 30a. 30b... bifurcated part, 32... bearing, 34... shaft,
36...Insertion part, 38...Lever, 4o...
Bearing, 42a, 42b... Surin l-,, 44...
coil spring. 46... Seat portion, 48... Screw rod, 50... Lever, 52... Seat plate L 54 a. 54b... Guy F hole, 5G... Stopper plate. 58...Elongated hole, 60...Protrusion, 62...Spring, 64...Spring. Patent applicant Rokuro Miyashita Figure 1 @ Figure 2 Figure 3 TyI 26 Figure 4 430 Figure 5 Figure 6

Claims (1)

[Claims] 1. A movable member guided in the vertical direction along a suitable support member is provided, a fixed member whose movement in the vertical direction is fixed at an appropriate position is provided below the movable member, and a back is provided above the movable member. a sliding member that is fitted onto the movable member and guided in a vertical direction; an upper arm that has one end pivoted to the sliding member; and a lower arm that has one end pivoted to the fixed member; 2 rotatably connected to each other at the other end of each
A joint link is provided, a seat is provided on the upper arm of the two-part link, and a fixing means is provided at the connecting portion of the two-part link to fix the opening angle between the upper arm and the lower arm to an arbitrary angle. A work chair.