JPH0225749Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a handle rotation adjustment device for horizontally adjusting the rotation of a steering handle in a walking type mobile agricultural machine such as an agricultural management work machine or a walking type tiller.

[Conventional technology]

For example, a walking-type mobile agricultural machine in which the base of the steering handle can be rotated horizontally around a nearly vertical shaft mounted on the machine frame is used, for example.
It is disclosed in the publication No. In this conventionally known device, a cam body is directly interposed between a support plate fixed to the upper part of a round bar-shaped support body and a support metal on the handle side.
The axial center of the support pin of this cam body is provided so as to be orthogonal to the axial center of the round rod-shaped support body, and the support plate is directly pushed up by rotating the cam body about the support pin, and The push-up force was released, the chrysanthemum was engaged, and the engagement was released.

[Problem that the invention attempts to solve]

However, with the above-mentioned conventional device, the engaging force must be applied to the chrysanthemum seat only by the force applied to the cam body. Therefore, unless a large force is applied directly to the cam body, sufficient pressure contact force cannot be applied to the chrysanthemum seat. Therefore, it is necessary to apply the force with a strong tension spring, which not only complicates the structure, but also reduces operability because the cam body must be operated against the tension of the strong tension spring. There were some problems.

[Means to solve the problem]

Therefore, in order to solve the above problem, the present invention fixes the upper and lower chrysanthemum seats to the base and machine frame, respectively, and engages and disengages the chrysanthemum seats by pressing or releasing the pressure on the base toward the machine frame. In addition to doing so,
A pivot portion and a free end portion of the operating member are located on both sides of the shaft on the base side, and a contact portion between the pivot portion and the free end portion of the operating member is attached to the shaft. The operating member is provided so as to be able to come into contact with the supporting member, and the free end of the operating member is brought into contact with a cam body pivotally supported on the base, and the operating member is pressed into contact with the supporting member by rotating the cam body. Alternatively, it is characterized by being configured so that the pressure contact can be released freely.

[Effect]

By configuring as described above, the handle rotation adjustment device of the present invention has a pivot portion and a free end portion of the operating member located on both sides of a substantially vertical axis, and a free end portion and a free end portion of the operating member are respectively located on both sides of the substantially vertical axis. A contact portion between the free end portion and the support member is provided so as to be able to contact the support member, and by bringing the free end portion into contact with the cam body and rotating the cam body, the cam is attached to the contact portion. The force applied to the body is transmitted in an amplified manner, so that the handle base can be easily and reliably tightened or untightened with respect to the machine frame with less force.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In Fig. 2, reference numeral A denotes a walking-type mobile agricultural machine such as an agricultural management work machine or a walking-type tiller, which has an engine 2 mounted on the front part of the machine frame 1 and drives wheels B to move. ing. Further, a base portion 3a of a steering handle 3 is provided at the upper part of the machine frame 1 so as to be rotatably adjustable in the horizontal direction, as shown in FIGS. 1, 3, and 4. A hollow cylindrical shaft 4 is installed almost vertically on the machine frame 1, and a part of the base 3a is inserted through the outer periphery of the shaft 4, and the lower surface of the base 3a and the upper surface of the machine frame 1 An upper chrysanthemum seat 5 and a lower chrysanthemum seat 6 are fixed respectively to the chrysanthemum seats 5 and 6. By pressing the base 3a toward the machine frame 1 side, the chrysanthemum seats 5 and 6 mesh to prevent rotation of the base 3a. When released, the base portion 3a is allowed to rotate. On the base 3a to which the upper chrysanthemum seat 5 is fixed to the lower surface, pivot members 7 and 8 are fixed on the front and rear sides with the shaft 4 in between. One bent end side of the operating member 9 (see ) is pivotally supported, and the other end extends toward the pivot member 8 side passing through both sides of the shaft 4, and the operating member 9 is connected to the pivot member 7 in a side view. It is formed to extend diagonally upward from the vicinity, bend from the center, and form a substantially horizontal shape, reaching the free ends 9a, 9a. The pivot member 8 has a support shaft 10 having cam bodies 10, 10 fixed to the free ends 9a, 9a.
a is pivotally supported, and an operating lever 10b is fixed to one end of the support shaft 10a. On the other hand, a threaded portion 4b is provided on the upper outer periphery of the shaft 4, and a support member 1 made of a nut is attached to this threaded portion 4b.
1 is screwed onto the support member, and its lower surface widely faces the abutting portion 9b between the pivot portion of the operating member 9 and the free ends 9a, 9a, and a lock nut 12 is attached to the threaded portion 4b of the support member. It is screwed onto the top of 11. When the operating lever 10b is positioned as shown by the solid line in FIG. Pushing up, the upper surface of the contact portion 9b of the operating member 9 is pressed broadly against the lower surface of the support member 11 with a strong force, and by the reaction force, the upper chrysanthemum seat 5 of the base 3a is strongly engaged with the lower chrysanthemum seat 6 for operation. Although the handle 3 does not rotate, the operating lever 10b
When rotated as shown in the imaginary line in Fig. 1, the cam body 1
0 releases the strong contact with the free end portion 9a, the operating member 9 rotates downward around the pivot point with the pivot member 7, releases the contact with the support member 11, and then At the same time, the pressure of the upper chrysanthemum seat 5 on the lower chrysanthemum seat 6 is released, and the operating handle 3 can freely rotate in the horizontal direction about the shaft 4. Inside the hollow hole 4a of the shaft 4 is an operating handle 3.
An operating wire 13 for a steering clutch, a throttle lever, etc. attached to the engine is inserted through and connected to a transmission part (not shown), an engine, etc. In the walking type mobile agricultural machine A having such a configuration,
When the operating lever 10b is in the solid line position in FIG.
The upper chrysanthemum seat 5 fixed to the base 3a strongly engages with the lower chrysanthemum seat 6 fixed to the machine frame 1 due to the reaction force, and the steering handle 3 cannot be rotated. . When adjusting the rotation of the steering handle 3, when the operating lever 10b is rotated to the imaginary line position shown in FIG. The pressure contact with the portion 9a is released, and the operating member 9 rotates downward around the pivot position of the pivot support member 7, releases the pressure from the support member 11, and moves the lower chrysanthemum seat 6 of the upper chrysanthemum seat 5. meshing with,
The engagement is loosened, and the steering handle 3 can be freely rotated in the horizontal direction as shown in FIG.
Once the steering handle 3 has been rotated to a desired position, the operating lever 10b is rotated to the solid line position in FIG. 1 to lock it in the same manner as described above. In addition, if the cam body 10 and the operating member 9 are worn out or deformed due to long-term use, the pressure contact force can be adjusted arbitrarily by loosening the lock nut 12, screwing the support member 11, and fixing it with the lock nut 12. I can do it. Further, a cam body 10, an operating member 9, a support member 1
If the first member is damaged, it can be easily replaced by loosening the lock nut 12 and threading the support member 11.

[Effect of the idea]

As explained above, according to the handle rotation adjustment device for a walking type mobile agricultural machine of the present invention, it is possible to press and release the pressure on the chrysanthemum seat fixed to the base of the operating handle and the chrysanthemum seat fixed on the machine frame side. In particular, a pivot portion and a free end portion of the operating member are located on both sides of a substantially vertical axis, and a contact portion between the pivot portion and the free end portion of the operating member is attached to the shaft. The operating member is provided so as to be able to come into contact with the supporting member, and the free end of the operating member is brought into contact with a cam body pivotally supported on the base, and the operating member is pressed into contact with the supporting member by rotating the cam body. Alternatively, since the pressure contact is made to be able to be released freely, the force applied to the cam body is amplified and the force of the operating member to contact the support member is transmitted as an amplified force, so that the steering handle is not tightened or tightened against the machine frame. To make release easier and more reliable with less force, especially when the cam body and operating member are worn or deformed due to long-term use, the support member can be adjusted up and down with respect to the shaft to reduce the pressure force. It can be corrected by adjustment, and its mechanism is simple, has few failures, is easy to maintain, and can be produced and supplied at low cost.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of the main parts showing an embodiment of the invention, Fig. 2 is a side view of the entire walking-type mobile agricultural machine to which the invention is applied, and Fig. 3 is a front view showing the main parts of the invention. , FIG. 4 is a plan view of the same. A... Walking type mobile agricultural machine, B... Wheels, 1... Machine frame, 2... Engine, 3... Steering handle, 3a
... Base, 4 ... Shaft, 4a ... Hollow hole, 4b ...
Threaded portion, 5... Upper chrysanthemum seat, 6... Lower chrysanthemum seat, 7,
8... Pivotal support member, 9... Operating member, 9a... Free end portion, 9b... Contact portion, 10... Cam body, 10a
... Support shaft, 10b ... Operation lever, 11 ... Support member, 12 ... Lock nut, 13 ... Operation wire.

Claims (1)

[Scope of utility model registration request] In a walk-behind mobile agricultural machine in which the base of the steering handle is rotatably adjusted in the horizontal direction about a nearly vertical axis set upright on the machine frame, upper and lower chrysanthemum seats are fixed to the base and the machine frame, respectively. The chrysanthemum seat is engaged and disengaged by pressing or releasing the pressure on the base toward the machine frame, and the base has a pivot portion and a free end portion of the operating member on both sides, sandwiching the shaft. , the abutting portion between the pivot portion and the free end of the operating member is provided so as to be able to abut on a support member vertically adjustable attached to the shaft, and the free end of the operating member is The walking-type movement is characterized in that the operating member is configured to come into contact with or release the pressure from the support member by making contact with a cam body pivotally supported by the base and rotating the cam body. Agricultural machinery handle rotation adjustment device.