JPH018216Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a chair backrest plate height adjustment device, and more specifically, it is attached to the upper end of the chair backrest rod and is rotatable in the front and rear directions so as to be in close contact with the back of the seated person. The object of the present invention is to make the height of the backrest plate adjustable so that it can come into contact with the back of a seated person naturally and without strain.

Hereinafter, the present invention will be explained based on the attached examples of embodiments.
A lifting rod 4 is tightly fitted into the center hole of the elevator so that it can be raised and lowered freely, and the backrest plate 3 is rotatably attached to the upper end thereof. member 5, and a pair of two members which are provided in the lifting rod 4 so as to be movable up and down with the adjusting member 5 sandwiched therebetween, and for engaging and disengaging the locking member 6, which is also provided in the lifting rod 4, to the adjusting member 5. It is composed of a combination of the operating plate 7 and an operating lever 8 which is provided on the upper end of the lifting rod 4 so as to be swingable in the vertical direction and whose free end is connected to the upper end of the operating plate 7. By lowering the operating plate 7 within the lifting rod 4 by means of 10 is removed from the adjusting member 5, the operating plate 7 and the lifting rod 4 can be raised and lowered together, and after setting the backrest plate 3 to the desired height, the operation of the operating lever 8 is released. The locking member 6 is automatically engaged with the adjusting member 5 by the elasticity of the spring 9, so that the backrest plate 3 can be fixed at a desired height position.

To explain the present invention in more detail, the locking members 6 are arranged as a pair to press and engage the adjustment member 5, and as a specific example, both side surfaces of the adjustment member 5 and both locking members are engaged. An uneven surface 11 or 12 of a constant pitch is formed on the inner facing surface of 6.
As shown in FIG. 4, the locking member 6 is provided with a spring retaining protrusion 13 on the upper end surface, and has a protruding shaft 14 on the upper part and a protruding shaft on the lower part. 15, the upper protruding shaft 14 passes through a longitudinally elongated hole 16 of the operating plate 7, and the lifting rod 4 is rotatably attached as shown in FIG. The projecting piece 13 on the upper surface is fitted into a guide hole 10 formed in a shape such that it expands upward and approaches each other as it goes downward.
and a cut-and-raised piece 17 provided opposite to the operating plates 7, 7,
17, and the elasticity of the spring 9 constantly urges the locking member 6 to rotate inward about the upper protruding shaft 14 to engage the uneven surfaces 11 and 12. Therefore, if the operating plate 7 is lowered within the lifting rod 4, the locking member 6 will move its lower protruding shaft 1.
5 is guided through the guide hole 10 and reaches the upper outer end 10' of the guide hole 10, so that the spring 9 is rotated around the upper protruding shaft 14 as shown by the arrow in FIG.
The lower protruding shaft 15 is released from engagement with the adjusting member 5 against the elastic force of the lower protruding shaft 15.
reaches the lower inner end 10'' of the guide hole 10 of the operating plate 7, so the locking member 6 is connected to the adjusting member 5 as shown in FIG. This state of engagement is further urged by the elasticity of the spring 9. In this way, in the present invention, the engagement and release of the locking member 6 and the adjustment member 5 to maintain the backrest plate 3 at a predetermined height are not performed simply by the elastic biasing and release of the spring 9, but by the operation plate 7. Since the lower protruding shaft 15 of the locking member 6 is guided and regulated by the guide hole 10, the operation can be ensured. Furthermore, as shown in FIG. 4, the guide hole 10 described above not only has a curved hole shape between the upper outer end 10' and the lower inner end 10'', but also a diagonally linear hole shape that will not hinder operation. will not occur.

On the other hand, a vertically elongated guide hole 18 is formed in the approximate center of the operating plate 7, and a protruding shaft 19 provided at the upper end of the adjusting member 5 is slidably fitted into the hole, and the end of the shaft is connected to the elevating rod. The notch 20 formed in the upper part of the operating plate 7 has a rubber or the like provided on the back side of the backrest plate 3 as shown in FIG. The buffer member 21 is passed through the buffer member 21, and the operating lever 8 of the operating lever 8, which has passed through the hole 4' of the lifting lever 4, is pivotally connected to the upper part of the notch 20, and the operating lever 8 is operated. This allows the operating rod 8 to perform a lever movement using the hole 4' as a fulcrum, thereby making the operating plate 7 vertically movable within the elevating rod 4.
In addition, a mounting piece 22 fixed to the backrest plate 3 is fitted onto the elevating rod 4 and rotatably attached to the shaft 23 to connect the backrest plate 3 and the elevating rod 4. A recess 24 for housing the backrest plate height adjustment device described above is formed on the side, and a cover 25 for blocking the recess 24 from the back side is attached to the support member 2 on the upper part of the backrest rod 1.
It is attached to the shaft 23 for connecting the mounting piece 22 and the lifting rod 4 by tightening it with a screw 26 while the mounting piece 22 is externally fitted so as to be movable up and down. In addition, 27 in the figure is a stop shaft for connecting the adjustment member 5 to the support member 2, and the cut and raised piece 17 formed on the operating plate 7 is 27 as shown in FIG.
By joining the facing cut and raised pieces 17 of the two operating plates 7 and fitting the upper ends of the springs 9 to both cut and raised pieces 17, the spring retaining effect can be achieved and the spring 9 can hold both operating plates 7 together. It is about unification.

According to the backrest plate height adjusting device of the present invention as described above, the operating plate 7 in the lifting rod 4 is moved up and down by operating the operating lever 8, and the operating plate 7 is guided by the operating plate.
By removing the locking member 6 to be regulated by the adjusting member 5 attached to the support member 2 on the upper part of the backrest rod 1, the backrest plate 3 integrally connected to the elevating rod 4 can be adjusted to a desired height. It can be done. In particular, in the present invention, the engagement and release operations between the locking member 6 and the adjusting member 5 are not carried out solely by utilizing the elasticity of the spring 9, but rather the lower part of the locking member 6 is moved by the vertical movement of the operating plate 7 within the lifting rod 4. The locking member 6 is rotated around the upper protruding shaft 14 by guiding the shaft 15 through a guide hole 10 formed in the operating plate,
The locking member 6 can be operated reliably by the upper outer end 10' and the lower inner end 10'' of the guide hole 10, since the locking member 6 can be engaged and released by holding the guide hole 10. It is possible to hold and regulate the lower protruding shaft 15 of the locking member 6 to keep it engaged with the adjusting member 5 or in the released state. In particular, the lower protruding shaft 15 can be held at the lower inner end 10'' of the guide hole 10. In this case, the locking member 6 is held in the state of being engaged with the adjustment member 5 by the engagement of the uneven surfaces 11 and 12, so that the locking member 6 is held in the state of being engaged with the adjustment member 5 due to an impact such as an external force. There is no need to worry about the device being involuntarily released from engagement with the device.

In addition, since the locking member 6 engages with the adjusting member 5 in a sandwiched manner, the engagement strength is higher than when engaging from one side. In addition, in the present invention, both end surfaces of the protruding shaft 19 at the upper end of the adjustment member 5 and the lower protruding shaft 15 of the locking member 6 are brought into contact with the inner surface of the elevating rod 4,
Alternatively, since they are brought close to each other, it is possible to prevent the adjusting member 5 and the operating plate 7 from shaking laterally within the lifting rod 4.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a chair showing an embodiment of the present invention, Fig. 2 is a vertical sectional front view showing the backrest plate attachment part, and Fig. 3 is a perspective view of a chair showing an embodiment of the present invention.
The figure is also a vertical side view, and FIG. 4 is a field perspective view showing the main parts. A: Chair, 1: Backrest rod, 2: Support member, 3: Backrest plate, 4: Lifting rod, 5: Adjustment member, 6: Locking member, 7: Operation plate, 8: Operation lever, 9: Spring ,1
0: Guide hole, 11, 12: Uneven surface, 13: Projection piece,
14: Upper protruding shaft, 15: Lower protruding shaft, 16: Long hole,
17: cut and raised piece, 18: guide hole, 19: protruding shaft,
20: Notch, 21: Buffer member, 22: Mounting piece,
23: shaft, 24: recess, 25: cover, 26: screw, 27: stop shaft.

Claims (1)

[Scope of utility model registration request] A support member 2 is fixed to the upper end of the backrest rod, and a lifting rod 4 whose upper end is connected to the backrest plate 3 is fitted into the center hole of the support member 2 so as to be able to rise and fall. An adjustment member 5 pivotally attached to the support member 2 is provided upright, and a pair of locking members 6 are pivotally provided to sandwich the adjustment member 5, and an operation plate 7 with an operation lever 8 connected to the upper end is engaged. A device for adjusting the height of a backrest plate of a chair, characterized in that the locking member 6 is linked to a locking member 6, and the locking member 6 can be engaged with and detached from the adjustment member 5 by vertically moving an operating plate 7 using an operating lever 8.