JPS6326060Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tilting device for tilting the seat of a chair in the front-rear direction.

Several devices for tilting the seat of a chair have been known, but all of them have drawbacks such as having a complex structure, making them cumbersome to operate, and being prone to failure. .

The present invention has been made to provide a seat tilting device that eliminates these conventional drawbacks, and includes a skirt-shaped cylinder fixed to the lower surface of the seat, and a pedestal on the upper part of the cylinder. The upper end is pivotally attached, and one end side of a movable plate having a pillar inserted through it is pivotally attached to the lower edge of the cylindrical body, and furthermore, an operating lever is provided on the movable plate protruding outward from the pivot portion, and other A plurality of engaging recesses are provided on the end side to removably engage with pins protruding from the lower edge of the cylindrical body, and the movable plate is configured such that the pins and the engaging recesses are always engaged by the bias of a spring. However, by rotating the operating lever, the movable plate can be rotated to tilt the seat portion together with the seat frame in the front-rear direction.

An embodiment of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a seat frame having a chair seat A fixedly installed on its upper surface and a hollow section inside, and a circular hole 2 is opened in the center of the bottom surface of the seat frame 1. Reference numeral 3 designates a cylindrical body formed into a skirt shape with an inner diameter through which the pedestal 4 is inserted, and the diameter increases toward the lower end. It is inserted into the hollow part of the seat frame 1 to approximately the middle and is welded and fixed to the circular hole 2. Communication holes 5 and 6 are provided in the upper part of the cylinder 3 and the pillar 4, through which a support shaft 7 is inserted and connected to each other.

Reference numeral 8 designates a movable plate that is slidably inserted into the pillar 4 through a circular hole 9, and has an operating lever 10 protruding from one end in the longitudinal direction. Further, a shaft hole 11 is formed in the movable plate 8 near the circular hole 9 near the operating lever 10, and an engaging recess 1 is formed at a predetermined interval on the other end side edge.
2a and 12b are formed. On the other hand, the cylindrical body 3
A pin receiving portion 13 is provided at the lower edge of the movable plate 8 in correspondence with the shaft hole 11 of the movable plate 8, and a pin 14 is further fixed to be removably engaged with the engaging recess 12a or 12b.

Then, the rotary pin 15 inserted from the lower surface of the shaft hole 11 is inserted into the pin receiving portion 13, and the movable plate 8 is rotatably attached. Further, the movable plate 8 is always pulled toward the seat frame 1 by a spring 18 whose both ends are engaged with a support pin 16 protruding from the other end and a support fitting 17 fixed on the lower surface of the seat frame 1. At the same time, the engagement of the pin 14 with the engagement recess 12a or 12b is maintained. Note that the support shaft 7 passes through a pin hole 19 at an outer position of the cylinder 3, and a pin pin 20 is inserted into each pin hole 19 to prevent it from coming out.

Next, to explain the operation, when the engagement recess 12a is engaged with the pin 14, as shown by the solid line in FIG. 5, the seat frame 1 is tilted forward as shown by the solid line in FIG. In such a state, the movable plate 8 is connected to the lower surface of the cylinder 3 by two points, the rotation pin 15 and the pin 14, so as to be unable to move horizontally, and the movable plate 8 is fitted into the pillar 4 to move horizontally. Since the movement is prevented, the posture of the cylinder 3 is fixed, and the seat frame 1 is fixed in a forward tilted state.

From this state, operate the operating lever 10 to release the spring 1.
The engagement recess 12a is pushed against the pin 14 against the tensile elasticity of the pin 14.
When removed from the housing, the cylindrical body 3 (seat frame 1) is unlocked and can freely tilt around the support shaft 7. Then, with the seat frame 1 tilted backward as shown by the chain line in FIG.
When engaged, the seat frame 1 is fixed in a backwardly tilted state.
The forward or backward tilted state of the seat frame 1 is reliably maintained as the engagement between the engagement recess 12a or 12b and the pin 14 is maintained by the urging force of the spring 18.

In order to simplify the explanation, this embodiment uses the movable plate 8.
Although two engaging recesses are shown,
By providing a large number of engagement recesses, the inclination angle can be adjusted in multiple stages.

As mentioned above, the tilting device for the seat of the chair of the present invention has an extremely simple structure and can be manufactured at low cost. It is pivotally attached to the side edge and the other end is biased by a spring to be drawn to the seat frame, and the engagement between the engagement recess and the pin is securely maintained, making the chair stable. It has many advantages, such as the fact that even when seated, the seat can be easily switched between tilting forward and tilting backwards by rotating the operating lever protruding from the movable plate in the horizontal direction. .

[Brief explanation of drawings]

The figures relate to one embodiment of the present invention; Fig. 1 is a side view of the chair, Fig. 2 is a perspective view showing the main parts of the invention, Fig. 3 is an exploded perspective view of the same, and Fig. 4 is the operation. FIG. 5 is a bottom view partially cut away. 1... Seat frame, 3... Cylindrical body, 4... Pillar, 8...
Movable plate, 10... Operating lever, 12a, 12b...
...Engaging recess, 14...pin, 18...spring.

Claims (1)

[Scope of utility model registration request] A skirt-shaped cylindrical body is fixed to the lower surface of the seat frame, and the upper end of the pedestal is pivotally attached to the upper part of the cylindrical body, and one end side of the movable plate with the pedestal inserted through the lower edge of the cylindrical body is pivoted. Further, the movable plate has an operating lever protruding outward from the pivot joint, and a plurality of engagement recesses that removably engage with pins protruding from the lower edge of the cylinder at the other end. . A tilting device for a seat in a chair, wherein the movable plate is configured such that the pin and the engagement recess are always engaged by the bias of a spring.