JPH0528245U - Chair seat tilting device - Google Patents

Abstract

(57) [Summary] [Purpose] The front-back tilt angle of the seat plate can be easily adjusted, and even if a large load acts on the seat plate, the seat plate can be maintained in that state stably without inadvertently tilting backward. An object of the present invention is to provide a seat tilting device for a chair that is simple. [Constitution] The front end of a tilting member (6) fixed to the lower surface of the seat plate (2) is pivotally attached to the front end of a base member (5) attached to the leg portion (1) of the chair so as to be able to tilt back and forth. , A longitudinal guide slot (13) formed in the rear part of both side plates (10) of the base member,
The floating support shaft (7) is inserted into the inclined elongated hole (17) formed by being inclined with respect to the guide elongated hole at the rear part of the hanging plate (15) of the tilting member, and the floating support shaft and the front end portion of the base member. A push-pull means (8) in the front-rear direction is provided which is associated therewith.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seat plate tilting device for a chair, and more particularly, to a seat plate tilting device for a chair that can adjust a seat plate that can be tilted forward and backward to a predetermined angle and reliably maintain the state.

[0002]

[Prior Art]

 Conventionally, various seat plate tilting devices for chairs have been provided. For example, as disclosed in Japanese Utility Model Application Publication No. 6940 in 1955, they are projected on the front part of the base member attached to the upper part of the leg part. The front part of the lower surface of the seat plate was pivotally attached to the installed arm so that it could be tilted back and forth, and the rear part of the base member was passed through the long hole of the other end of the connecting rod whose one end was pivotally connected to the rear part of the lower surface of the seat plate. Passing through the protruding end of the shaft, screwing a wing nut onto the protruding end of the shaft to fix the connecting rod to the rear part of the base member, and changing the relative position between the elongated hole and the shaft for tight fitting. This allows the tilt angle of the seat plate to be adjusted.

However, the load applied to the seat plate is supported by the pivotal attachment point of the front part and the tight attachment point of the shaft and the connecting rod of the rear part. Especially, the large load is applied to the connecting rod of the rear part, and Since the rod, that is, the long hole is arranged almost vertically, the load is received only in the unstable state due to the contact friction between the connecting rod and the rear portion of the base member due to the tight attachment of the wing nut. Therefore, when a large rearward load is applied to the seat plate, the tightening point may shift and the seat may suddenly tilt rearward, and the wing nut may also loosen and similarly tilt rearward. There is a problem in safety.

Further, a tilting device for a seat plate using a gas cylinder or a spring is also known, but each has a problem that the structure is complicated and the cost is high.

[0005]

[Problems to be solved by the device]

 In view of the above situation, the present invention is to solve the problems that the front and rear tilting angle of the seat plate can be easily adjusted and the seat plate is stably tilted rearward even if a large load acts on the seat plate. The purpose of the present invention is to provide a seat tilting device for a chair that can maintain its state and has a simple structure.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention pivotally attaches a front end of a tilting member fixed to the lower surface of a seat plate to the front end of a base member attached to a leg of a chair so that the base can be tilted forward and backward. A longitudinal guide hole is formed in the rear part of both side plates of the member, and an inclined long hole is formed in the rear part of the hanging plates on both sides of the tilting member so as to be inclined with respect to the guide long hole. A push-pull means in the front-rear direction is provided which is associated between the shaft and the front end of the base member.By operating the push-pull means, the floating support shaft is moved back and forth in the guide elongated hole and the inclined elongated hole. The seat tilting device for chairs is constructed by adjusting the tilting angle of the seat.

[0007]

[Action]

 With the seat plate tilting device of the present invention having the above-mentioned contents, the floating support shaft of the base member is changed by operating the pushing / pulling means to change the distance between the floating support shaft and the front end of the base member. It moves in the front-rear direction along the guide slots formed in the rear parts of both side plates, and at the same time, it also moves in the tilted slot holes formed in the rear parts of the hanging plates on both sides of the tilting member. Since the tilting member is set in the state, the rear part of the tilting member is displaced up and down about the pivot point of the front end, thereby adjusting the front-back tilting angle of the seat plate. Here, the load acting on the rear portion of the seat plate is supported via the upper edge of the tilted elongated hole of the tilting member, the floating support shaft, and the lower edge of the guide elongated hole of the base member. Since the position of is fixed by the pushing and pulling means, the state is stably maintained.

[0008]

【Example】

 The present invention will be further described in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 is a partial vertical sectional side view of a chair according to the present invention, and FIGS. 2 and 3 show a tilting device of a main part thereof. Here, in the figure, A is a tilting device, 1 is a leg portion, 2 is a seat plate, and 3 is a backrest. In the chair according to the present invention, a tilting device A is fixed to an attachment member 4 attached to the upper ends of legs 1, a seat plate 2 is fixed to the upper surface of the same, and a backrest 3 is attached to the attachment member 4. It is configured by connecting.

The tilting device A includes a base member 5 fixed to the mounting member 4, a tiltable tilting member 6 having a front end portion pivotally attached to a front end portion of the base member 5, and a tiltable member 6 in the front-rear direction. As a result, the base member 5 and the tilting member 6 are composed of a floating support shaft 7 that connects the rear part of the tilting member 6 so as to be adjustable in the vertical direction, and an adjusting rod 8 as a pushing and pulling means that moves the floating support shaft 7 back and forth.

The base member 5 has a shell structure in which side plates 10 and 10 are erected on both sides of a bottom plate 9 fixed to the mounting member 4, and a front plate 11 is erected on the front end. A fixed support shaft 12 is attached to the front end of 10 in a penetrating manner, and guide slots 13, 13 are formed in the rear of the 10, extending substantially horizontally in the front-rear direction. Here, the fixed support shaft 12 may be replaced by a pin protruding on the outer surface of the side plate 10.

The tilting member 6 has the hanging plates 15 and 15 located outside the both side plates 10 and 10 of the base member 5 on both sides of the upper plate 14 for fixing the seat plate 2 and At the front ends of the plates 15 and 15, shaft holes 16 and 16 rotatably pivotally attached to the projecting end of the fixed support shaft 12 are formed, and at the rear part, a tilted state with respect to the guide elongated hole 13. The slanted long holes 17 and 17 are set as described above. Here, in the present embodiment, the inclined elongated hole 17 is formed so as to be inclined rearward and upward, but it is also possible to be formed so as to be inclined forward and upward. The inclination angle of the inclined elongated hole 17 is preferably around 30 °.

The floating support shaft 7 has guide front holes 13, 13 of the base member 5 with the front end portions of the base member 5 and the tilting member 6 pivotably attached to each other by a fixed support shaft 12 so as to be tiltable forward and backward. And the slanted elongated holes 17, 17 of the tilting member 6 at the same time, and annular recessed grooves 19 into which the E-rings 18, 18 are fitted are formed at both ends thereof.

The adjusting rod 8 as the pushing / pulling means is for changing the distance between the front end portion of the floating support shaft 7 and the base member 5. In this embodiment, one end of the adjusting rod 8 is the central portion of the free support shaft 7. To the lever so that the screw portion 21 provided at the other end is screwed into the screw hole 22 formed in the front plate 11 of the base member 5 and is connected to the lever provided at the other end. By rotating 23, it is moved in the front-rear direction, whereby the floating support shaft 7 is displaced in the front-rear direction.

When the lever 23 is operated to move the adjusting rod 8 forward from the state shown in FIG. 3, the floating support shaft 7 is moved along the guide elongated hole 13 of the base member 5 accordingly. At the same time as sliding forward, it moves forward in the inclined elongated hole 17 of the tilting member 6, at which time the rear part of the tilting member 6 is pushed upward by the floating support shaft 7 about the fixed support shaft 12, This results in the forward tilting state shown in FIG. On the contrary, when the adjusting rod 8 is moved rearward, the rearward inclined state shown in FIG. 5 is obtained. Of course, since the adjusting rod 8 is moved in the front-back direction by the screwing relationship between the screw portion 21 and the screw hole 22, it is possible to set an arbitrary tilting angle between the front tilting state and the rear tilting state. Here, if the direction of the inclination of the inclined elongated hole 17 is reversed, the operation opposite to the above operation is performed.

6 shows another embodiment of the pushing and pulling means, one end of the tubular body 24 is fixed to the central portion of the floating support shaft 7 to form a T-shape, and a female member is formed on the inner surface thereof. A male screw portion 26 formed at one end portion of the adjusting rod 8 is screwed into the screw portion 25, and the other end portion is attached to the front plate 11 by an E ring 27 or the like so as to be rotatable in a fixed position. The floating support shaft 7 is moved by screwing the adjusting rod 8 into and out of the cylindrical body 24.

7 and 8 as still another embodiment of the push-pull means, one end of the adjusting rod 8 is fixed to the central portion of the floating support shaft 7, and the other end is fixed to the front plate 11. One of the engaging recesses 29, ... Inserted into the engaging hole 28 opened at the same time and formed at regular intervals in the length direction of the other end, is engaged with the rim of the engaging hole 28, Further, a spring member 30 fixed to the inner surface of the front plate 11 on the side opposite to the engaging recess 29 elastically biases the adjusting rod 8 in the engaging direction. Here, in order to move the adjusting rod 8 in the front-rear direction, the lever 23 is displaced downward in the drawing against the elastic force of the belt member 30, and in that state, the lever 23 is moved in the front-rear direction, and then a predetermined amount. The engagement recess 29 is engaged with the rim of the engagement hole 28.

Here, in the embodiment shown in FIGS. 6 to 8, the relationship between the guide elongated hole 13 and the inclined elongated hole 17 is reversed, that is, the inclined elongated hole 17 is formed in the base member 5 and the tilting is performed. It is also possible to form the guide slot 13 in the member 6.

[0019]

[Effect of the device]

 The chair seat tilting device of the present invention as described above pivots the front end of the tilting member fixed to the lower surface of the seat plate to the front end of the base member attached to the leg of the chair so as to be able to tilt back and forth. The guide shaft is inserted through the longitudinal guide holes formed in the rear portions of the both side plates of the base member and the inclined long holes formed in the rear portions of the hanging plates of the tilting member on both sides of the tilting member so as to be inclined with respect to the guide elongated holes. Since the pushing and pulling means in the front-back direction is provided between the floating support shaft and the front end portion of the base member, the distance between the floating support shaft and the front end portion of the base member is changed by operating the pushing and pulling means. As a result, the floating support shaft that moves in the front-rear direction along the guide elongated hole of the base member also moves within the inclined elongated hole of the tilting member, and the rear part of the tilting member is vertically displaced around the pivot point of the front end. Therefore, the tilting angle of the seat plate can be adjusted. Moreover, after the tilt angle has been set, the load acting on the rear part of the seat plate passes through the upper edge of the inclined elongated hole of the tilting member, the floating support shaft, and the lower edge of the guide elongated hole of the base member. The tilting angle can be stably maintained, and there is no possibility that the angle is abruptly changed because the tilting angle is stably supported by the pushing and pulling means.

[Brief description of drawings]

FIG. 1 is a side view showing a chair in which a seat tilting device of the present invention is incorporated in a partial cross section.

FIG. 2 is an exploded perspective view showing a main part of the present invention.

FIG. 3 is a vertical cross-sectional side view showing the main part of the same.

FIG. 4 is a vertical sectional side view showing a front tilting state.

FIG. 5 is a vertical sectional side view showing a rearward tilting state.

FIG. 6 is a vertical sectional side view showing another embodiment of the seat plate tilting device.

FIG. 7 is a vertical sectional side view showing still another embodiment of the seat plate tilting device.

[Fig. 8] Similarly, an enlarged vertical side view of the main part.

[Explanation of symbols]

A tilting device 1 leg 2 seat plate 3 backrest 4 mounting member 5 base member 6 tilting member 7 floating support shaft 8 pushing and pulling means (adjusting rod) 9 bottom plate 10 side plate 11 front plate 12 fixed support shaft 13 guide long hole 14 top Plate 15 Hanging plate 16 Shaft hole 17 Inclined long hole 18 E-ring 19 Annular groove 20 Coupling 21 Thread part 22 Screw hole 23 Lever 24 Cylindrical body 25 Female screw part 26 Male screw part 27 E ring 28 Engagement hole 29 Engagement Recess 30 Spring member

Claims (1)

[Scope of utility model registration request] 1. A front end portion of a tilting member fixed to a lower surface of a seat plate is pivotally attached to a front end portion of a base member attached to a leg portion of a chair so as to be capable of tilting forward and backward, and is formed at a rear portion of both side plates of the base member. The idle support shaft is inserted through the guide elongated hole in the front-rear direction and the inclined elongated holes formed in the rear portions of the hanging plates on both sides of the tilting member so as to be inclined with respect to the guide elongated hole, and between the idle support shaft and the front end portion of the base member. Is provided with a push-pull means in the front-back direction, and by operating the push-pull means, the floating support shaft is moved back and forth in the guide elongated hole and the inclined elongated hole to adjust the tilt angle of the seat plate. A seat plate tilting device for a chair, characterized in that