JPS604428Y2 - Backrest rod angle adjustment device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for adjusting the angle of a backrest rod, and its purpose is to provide a device that can securely fix the backrest rod at a desired angle.

Conventionally, various types of backrest rod angle adjustment devices have been provided, but they have drawbacks such as being troublesome to operate, having a complicated structure, and being prone to failure.

In view of this point, the present proposal was devised, in which a housing having a cylindrical shape with a bottom and an axial groove formed in the inner circumferential wall is fixed to the frame, and a handle is fixed to the housing. A first crown gear that freely rotatably supports a rotating shaft, has a short cylindrical portion integrally formed with the rotating shaft, and has a first locking tooth formed on the negative side of the short cylindrical portion side. , - a second crown gear having a second locking tooth formed on a side surface thereof that engages with the first locking tooth in a freely removable manner, a first cam formed on the other side surface, and a projection protruding radially outward; the protrusion enters the groove and is slidably fitted into the short cylindrical portion, and the first and second locking teeth are brought into mesh with each other and are opposed to the first cam. A rotating body having a second cam formed on one side thereof is fixed to the rotating shaft with the tops of the axially protruding parts of the first cam and the second cam in contact with each other, and one end is fixed to the rotating shaft and the other end is fixed to the rotating shaft. The gist of the present invention is to provide a spring whose end is supported by the housing, and to connect a backrest rod to the first crown gear.

Next, one embodiment of the present device will be described based on the drawings.

Reference numeral 1 denotes a frame (not shown) for supporting dust, and the frame 1 has a cylindrical shape with a bottom, and has a plurality of linear grooves 2 extending in the axial direction on the inner circumferential wall, and a frame 1 at the center of the bottom. A housing 4 having a bearing portion 3 formed thereon is fixed thereto.
A handle 5 is attached to the housing 4 via the bearing portion 3.
The rotary shaft 6, which is fixed to the rotary shaft 6, is freely rotatably supported.

Reference numeral 7 denotes a first crown gear loosely fitted on the outer circumferential surface of the rotary shaft 6 within the housing 4, and the gear 7 has a short cylindrical portion 8 integrally formed on the blade side in the axial direction. On the part 8 side,
- It has a structure in which a first locking tooth 9 consisting of a large number of teeth is formed on one side, and a large number of protrusions 10 are formed on the other side, and a central hole 11 that is continuous with the through hole of the short cylindrical part 8. It is loosely fitted into the rotary shaft 6 passing through the rotary shaft 6 so as to be freely rotatable.

Further, reference numeral 12 denotes a second crown gear fitted around the outer periphery of the short cylindrical portion 8 so as to be freely slidable in the axial direction.
, a second locking tooth 13 consisting of a large number of teeth facing the first locking tooth 9 and capable of meshing is formed on one side, and a large number of teeth projecting in the axial direction are formed on the other side. It has a structure in which a first cam 15 is formed of a substantially mountain-shaped protrusion 14, a large number of protrusions 16 are formed outward in the radial direction, and a fitting hole 17 is formed in the center in the radial direction. The short cylindrical portion 8 is fitted into the fitting hole 17, and the plurality of protrusions 16 are inserted into the groove 2 to prevent the second crown gear 12 from rotating together with the rotating shaft 6. As described above, it is fitted onto the outer circumferential surface of the short cylindrical portion 8 and allowed to freely slide along the groove 2 in the axial direction.

In other words, the second crown gear 12 slides in the axial direction with respect to the rotating shaft 6, but the short cylindrical portion 8 prevents it from rotating together with the rotating shaft 6.
It is fitted around the outer periphery of the

Further, 18 has a first cam 1 on the side opposite to the first cam 15.
A second cam 19 having a protrusion 14a that contacts the protrusion 14 of the rotor 6 is fixed to the rotating shaft 6 through a through hole 20 formed at the center in the radial direction. 18 to the rotating shaft 6, the first
The locking teeth 9 and the second locking teeth 13 are engaged with each other, and the first
Approximately mountain-shaped protrusions 14 and 1 of the cam 15 and the second cam 19
The vertices of 4a are fixed in contact with each other.

That is, when the protruding part 14 of the first cam 15 and the protruding part 14a of the second cam 19 mesh with each other, the second locking teeth 13 of the second crown gear 12 are formed on the first crown gear 7. It is separated from the first locking tooth 9 and fixed with a locking pin 21 at a position where it can slide in the direction of the rotating body 18.

In other words, the substantially mountain-shaped protrusion 1 formed on the second crown gear 12 and the rotating body 18 corresponds to the length and height in the axial direction of the first locking teeth 9 and 13 formed on the first and second crown gears.
4 and 14a (in the axial direction and the height), the above-mentioned detachment is made possible, as will become clear later.

The stop pin 21 has both ends thrust into the groove 2, and when the rotation shaft 6, in other words the handle 5, is rotated, the stop pin 21 rotates together with the rotation shaft 6, and both ends of the stop pin 21 are inserted into the groove 2. The rotation of the rotating shaft 6 is stopped by being engaged with the side wall of the rotary shaft 6, and the substantially mountain-shaped protrusions 14 and 14a are engaged with each other as described above.

Further, 22 is a wound spring having one end supported on the rotating shaft 6 and the other end supported on the housing 4.

Further, reference numeral 23 denotes a mounting bracket fixed to the first crown gear 7 via the plurality of protrusions 10, and the backrest rod 24 is detachably fixed to the mounting bracket 23 with bolts 25 and nuts 26.

Further, 27 is a washer fixed to the rotating shaft 6 on the outside of the mounting fitting 23, and between the washer 27 and the rotating body 18, the axis of the first crown gear 7 and the second crown gear 12 is fixed. It is like regulating movement in the direction.

The backrest rod angle adjusting device of the present invention is constructed as described above, and the method of use and operation and effects thereof will be explained next.

First, the handle 5 is rotated in a predetermined direction against the winding spring 22 to rotate the rotating body 18 together with the rotating shaft 6, thereby removing the approximately mountain-shaped protrusions 14 formed on the first cam 15 and the second cam 19, respectively. and the position of the top of 14a, and the second
A gap is formed between the second crown gear 12 and the rotating body 18 so that the crown gear 12 can slide in the direction of the rotating body 18.

Next, when a force is applied to the backrest rod 24 to rotate it in the desired direction,
A force for rotating the first crown gear 7 in a desired direction is applied via the mounting bracket 23, and the first locking tooth 9 formed on one side of the first crown gear 7 engages the first locking tooth 9 formed on the second crown gear 12. Since the second locking tooth 13 is pressed, the second crown gear 1°
2 slides in the direction of the rotating body 18 and the second crown gear 12
and the first crown gear 7 are released, and the backrest rod 2
4 can be rotated to the desired position.

That is, since the handle 5 is rotated as described above and a gap is previously formed between the rotating body 18 and the second crown gear 12 as described above, the second crown gear 12 can be easily moved in the direction of the rotating body 18 as described above. It can be made to slide.

Once the position of the backrest rod 24 is determined as described above, the handle 5 is released and the repulsive force of the winding spring 22 causes the rotating body 18 to return to its original position via the rotating shaft 6.

During this return, the design is such that the tops of the substantially mountain-shaped protrusions 14 and 14a are in contact with each other, so that the second cam 19 of the rotary body 18 is moved to the first position of the second crown gear 12.
The cam 15 is pressed to slide the second crown gear 12 in the direction of the first crown gear 7, and as a result, the first locking teeth 9 of the first crown gear 7 and the second locking teeth of the second crown gear 12 13 is in mesh with the second crown gear 12.
The protrusion 16 formed in the groove 2 protrudes into the groove 2 as described above, and since the second crown gear 12 is prevented from rotating, the backrest rod 24 can be reliably fixed at a fixed position.

Furthermore, since the first and second locking teeth 9, 13 are formed by an assembly of a large number of teeth, the backrest rod 24 can be fixed at a desired position.

As is clear from the above explanation, since the device of the present invention is constructed as described above, it is possible to securely fix the backrest rod at a desired position by operating the handle, and since the structure is simple, it can be used for a long period of time without failure. It can withstand many uses.

[Brief explanation of drawings]

The drawings show one embodiment of the proposed device, and FIG. 1 is a partially cutaway and partially sectional front view, and FIG. 2 is a partially cutaway front view, and FIG.
A-line sectional view, Figure 3 is a front view of the first crown gear, and Figure 4 is a front view of the first crown gear.
The figure is a front view of the second crown gear, FIG. 5 is a plan view thereof, and FIG. 6 is a sectional view taken along line BB in FIG. 1. 1...Frame, 2...Groove, 4...
...Housing, 5...Handle, 6...
... Rotating shaft, 7. Curved, first crown gear, 8...
...Short cylinder part, 9...First locking tooth, 12...
...Second crown gear, 13...Second locking tooth,
15...First cam, 14, 14a...
Projection part, 16... Protrusion, 18... Rotating body, 19. Curved second cam, 22... Spring, 24... Back rod.

Claims (1)

[Scope of utility model registration request] A housing having a cylindrical shape with a bottom and an axial groove formed in the inner peripheral wall is fixed to the frame, and a rotating shaft having a handle fixed to the housing is rotatably supported,
A short cylindrical portion is integrally formed with the rotating shaft, and a first crown gear having first locking teeth formed on the − side surface of the short tube portion side is loosely fitted, while the first locking teeth are formed on the − side surface of the short cylindrical portion side. A second crown gear is provided with a second locking tooth that can be freely attached to and detached from the tooth, a first cam is formed on the other side, and a protrusion that projects outward in the radial direction is formed by inserting the protrusion into the groove. A rotary member that is slidably fitted into the short cylindrical portion, and that the first and second locking teeth are in mesh with each other, and that a second cam opposite to the first cam is formed on one side. the body is fixed to the rotating shaft with the tops of the axially protruding parts of the first cam and the second cam in contact with each other, and a spring is provided with one end supported by the rotating shaft and the other end supported by the housing. and a backrest rod angle adjusting device, characterized in that the backrest rod is connected to the first crown gear.