JPH046339Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a seat angle adjustment device used, for example, in an agricultural tractor.

(Prior Art) A conventional tractor seat angle adjustment device includes an engagement member having a plurality of engagement portions at the center of the front portion of the lower surface of the seat, and a member on the vehicle body side that can be freely engaged with and disengaged from the engagement portion. By providing an engaged member and engaging the engaged member with an engaging portion of a desired height via a lever from the side of the seat, the inclination angle of the seat can be adjusted to suit the physique of the operator. It is configured so that the height of the seat can be adjusted.

(Problems to be solved by the invention) In the above-mentioned conventional technology, the seat is supported only in one place in the center, which may lead to strength problems, and the adjustment lever is located on the side of the vehicle body. Since the lever is supported by the lever, it may become difficult to operate the lever if the seat height increases.

(Means for solving the problem) Therefore, the seat is pivotally supported at the rear of the support base attached to the vehicle body, and multiple engagement parts are formed in the upper and lower parts of the left and right front parts of the seat, and the lower part of the front part of the seat is A guide member is provided which supports the left and right engaging rods which are freely engageable and detachable from the engaging portion and which are biased in the engaging direction so as to be rotatable around a vertical axis, and which guides and supports the rotation of each of the engaging rods. It is conceivable to provide the lever on the left and right sides of the front lower part of the seat, provide a lever on one of the engagement levers, and configure the lever so that its rotation can be transmitted to the other engagement lever.

However, in such a configuration, the inner ends of both engaging rods must be interlocked and connected, but if they are connected using a pin or the like, parts are required and assembly becomes troublesome.

In this invention, two engaging rods are formed separately and independently, and the inner end of the engaging rod without a lever is placed close to the inner end of the engaging rod provided with a lever on the disengagement operation side. To provide a seat angle adjustment device which can be assembled extremely easily without using parts.

In other words, the specific structure of the problem-solving means of the present invention is characterized in that the rear part of the seat part 3 is pivotally supported on the rear part of the support stand 8 attached to the vehicle body, and the rear part of the seat part 3 is supported in a plurality of upper and lower stages on the left and right front parts. The middle portions of two engaging rods 16 that form a joint portion 11 and are freely engageable and detachable from the left and right engaging portions 11 and are biased in the engaging direction are rotated to the seat portion 3 via the vertical shafts 15, respectively. Guide members 6 that movably support each engaging rod 16, guide the rotation of each engaging rod 16, and support the vertical direction are provided at the left and right lower portions of the seat portion 3, and the two engaging rods 16 are connected to the engaging portion 11. The seat angle adjusting device is provided with a lever 18 at one outer end so as to simultaneously disengage from the two engaging rods 16, and the inner end of the lever 18 is interlocked with the inner end of the other engaging rod 16. are formed separately and independently, and the inner end of the other engaging rod 16 is disposed close to the inner end of the one engaging rod 16 on the disengagement operation side.

(Function) When the left and right engaging rods 16 are guided and supported by the guide member 6 and engage with the engaging portions 11 of the support base 8, the seat 2
is supported at two places on the left and right sides of the front lower part of the seat part 3, and the lever 18 provided on one of the engagement rods 16
When the engaging rod 16 is rotated in the detachment direction around the vertical axis 15 by holding the lever, the inner end of one engaging rod 16 contacts the inner end of the other engaging rod 16 and rotates it in the opposite direction. Both engaging rods 16 can be engaged with and disengaged from the engaging part 11 at the same time, and by selecting the engaging part 11 to be engaged, the inclination angle, that is, the height of the seat part 3 is adjusted, and even if this adjustment is performed, Since the lever 18 is provided on the seat portion 3 side, its position is immovable relative to the operator.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a seat device mounted on the rear upper part of the tractor body. This seat device 1 includes a seat 2 having a seat portion 3 and a backrest portion 4.
, a mounting base 6 (guide member) fixed to the lower surface of the seat 3, a support base 8 fixed to the floor sheet 7 on the tractor body side or a hydraulic system, etc., and an angle for adjusting the front height of the seat 3. It is equipped with an adjustment device 9 and the like.

The support stand 8 is formed by connecting a pair of left and right plates 8a with a connecting member 10, and is fixed to a mounting portion 7a on the floor sheet 7. The support base 8 may be configured to be adjustable in position in the front and back direction via a slide device. A plurality of concave engaging portions 11 are formed in the front portion of each of the left and right plate members 8a in upper and lower stages, and the rear portion thereof rotatably supports the rear portion of the mounting base 6 via a pivot shaft 12.

There is a pair of mounting stands 6 on the left and right corresponding to the plate material 8a,
It is screwed to the left and right sides of the lower surface of the seat part 3, and a guide elongated hole 13 extending approximately in the front-rear direction is formed in the front part thereof.

Reference numeral 15 denotes a pair of left and right vertical shafts provided on the lower surface of the seat portion 3. A midway portion of an engaging rod 16 is rotatably supported on each vertical shaft 15, and a coil spring fitted to the vertical shaft 15 is supported. 17, each engagement rod 16 is biased in the A direction (engagement direction). The vertical shaft 15 may be attached to the connecting plate by constructing a connecting plate between the left and right mounting bases 6.

The outer end side of each engagement rod 16 passes through the guide slot 13 of the mounting base 6, and the rotation is guided and the rotation range is set, and furthermore, it is supported in the vertical direction. . The outer end of the engagement rod 16 can be freely engaged with and disengaged from the engagement part 11, and by changing the engagement part 11 up and down, the vertical inclination angle about the pivot 12 of the seat part 3 can be changed. and the height of the front part of the seat part 3 is adjusted. Further, by engaging the engagement rod 16 with the engagement portion 11, the relative positions of the mounting base 6 and the support base 8 are fixed, and the seat portion 3 is supported by the left and right portions of the front lower part.

One outer end of the two engaging rods 16 is bent upward to form a lever 18, and its inner end is in contact with the inner end of the other engaging rod 16, causing the lever 18 to When moving in the direction of arrow B, the engaging rod 16 rotates around the vertical axis 15, and this rotation is transferred to the other engaging rod 1.
6 as a reverse rotation and are configured to be interlocked with each other.

That is, the two engaging rods 16 are formed separately and independently.
is an engagement rod 16 that is not provided with a lever 18 on the inner end of the engagement rod 16 that has a lever 18 on the disengagement operation side.
The inner ends of the levers 18 are arranged close to each other, so that the two engaging rods 16 are interlocked and connected at their inner ends, and the lever 18
When you operate both engaging rods 16 rotate in the opposite direction,
They separate from the left and right engaging portions 11 at the same time. Engagement part 11
The engagement is effected by a coil spring 17.

the engaging portion 11, the guide elongated hole 13, the vertical shaft 15,
An angle adjustment device 9 is constituted by the engagement rod 16 and the like.

The seat 2 has a backrest 4 which can be adjusted in angle with respect to the seat 3 via an angle adjuster 19. Alternatively, the seat portion 3 may be attached to the support base 8 via the pivot 12, and the mounting base 6 may be formed as a member having only the guide elongated hole 13.

(Effect of the invention) According to the invention described in detail above, the pair of left and right engaging rods 1 releasably engage with the engaging portion 11 of the support base 8.
6 is supported on the seat 3 side via a vertical shaft 15, so even if the inclination angle of the seat 3 is adjusted and the height of its front part changes, the operator seated on the seat 3 will always be able to maintain the same position. In this state, the lever 18 can be operated, and the adjustment operation is extremely easy. In addition, guide members 6 that guide the rotation of each engagement rod 16 and support it in the vertical direction are provided at the left and right lower portions of the seat portion 3. Since the seat part 3 is provided, the seat part 3 is supported at two places on the left and right sides of the front part, which doubles the strength compared to supporting it at one place in the center, and also allows the apparatus to be made more compact in the vertical direction. Moreover, no connecting parts such as pins are required to interlock and connect the two engaging rods 16, making the structure simple and compact, and extremely easy to assemble.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a side view, and FIG. 3 is an exploded perspective view of main parts. 1... Seat device, 2... Seat, 3... Seat part, 6
...Mounting stand (guide member), 8...Support stand, 9...
... Angle adjustment device, 11 ... Engagement part, 13 ... Guide elongated hole, 15 ... Vertical shaft, 16 ... Engagement rod, 18 ...
…lever.

Claims (1)

[Claim for Utility Model Registration] The rear part of the seat part 3 is pivotally supported on the rear part of a support stand 8 attached to the vehicle body side, and a plurality of upper and lower engagement parts 11 are formed on the left and right front parts of the seat part 3, and each of the left and right engagement parts The middle portions of two engaging rods 16 that can be freely engaged with and disengaged from the portion 11 and biased in the engaging direction are rotatably supported on the seat portion 3 via the vertical shafts 15, and each of the engaging rods 16 A guide member 6 is provided at the left and right lower portions of the seat portion 3 to guide the rotation and provide support in the vertical direction, and a lever is provided at one outer end to simultaneously release the two engaging rods 16 from the engaging portion 11. 18 and interlockingly connects the inner end thereof to the inner end of the other engaging rod 16, wherein the two engaging rods 16 are formed separately and independently, and the other engaging rod 16 is formed separately and independently. A seat angle adjustment device characterized in that the inner end of the rod 16 is disposed close to the inner end of one of the engagement rods 16 on the disengagement operation side.