JPS6218541Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a handle vertical position adjustment structure for a walk-behind cultivator.

Conventionally, the handle of a walk-behind tiller was
As described in Publication No. 7713, etc., the base end of the handle is pivoted so as to be movable up and down, and a support plate with a long hole is hung from the base end of the handle, and the support plate and the fuselage frame are connected to each other. A fixing plate protruding from the handle is configured to be tightened and fixed with bolts, and the handle can be adjusted in vertical position through a long hole in the support plate.

However, with the above-mentioned structure, since the vertical position of the handle is adjusted by tightening and adjusting the bolt, a tool is required for operation, and this operation cannot be performed quickly.

Further, Japanese Utility Model Publication No. 36-21488 and the like describes a structure in which a plug-in unit can be removed with a single touch.

Therefore, it is conceivable to use the detachable structure of this plug-in unit to adjust the vertical position of the handle with a single touch, but simply combining them does not allow for smooth vertical position adjustment, and furthermore,
There was also the problem that it was impossible to prevent the infiltration of rain and dew.

In this device, the base of both arms of the handle is pivotally supported on a machine base for mounting the handle, which is hollow inside, so that the base of both arms of the handle can be rotated up and down freely, and a position adjustment device is interposed between the base of both arms and the machine base in front of the pivotal support,
In this device, an adjustment rod with a tapered circumferential surface and an operating part at its lower end is provided on a support plate attached to the bottom of the machine base so as to be able to slide up and down, and a spring is provided between the adjustment rod and the top surface of the machine base to urge the adjustment rod downward. Left and right pins are provided on the left and right sides of the tapered shape of the adjustment rod, and their bases are formed in semicircular arc-shaped recesses so as to closely abut against the tapered shape, and the tips of both pins are configured to protrude from pin holes provided on both sides of the machine base so as to be able to slide back and forth. The tips of the left and right pins protruding from the pin holes are
The object of the present invention is to provide a handle vertical position adjustment structure for a walk-behind tiller, which is configured so that the handle vertical position can be inserted and removed into pin insertion holes for adjusting the handle vertical position, which are provided at a plurality of base portions of both arms located opposite each other on both sides of the machine base.

If the embodiment of this invention is explained in detail based on the drawings, A indicates a power tiller, a rotary part b is connected to a management machine a via a hitch 1, and a management machine a is a power tiller. An engine 2 is mounted on the front part of a', and power is transmitted from the engine 2 to wheels 4 via a transmission part 3, and a rotary part b has tilling claws 5 installed on a rotary machine frame b'. A tail wheel 6 is attached to the rear of the farm, and the farm is configured to carry out plowing work while traveling by being towed by a management machine a.

A handle 8 is attached to the handle mounting base 7 on the machine body a' of the management machine a, and the handle 8 is attached to the machine base 7 for attaching the handle.
has a hollow interior, and both arm bases 8-1, 8 of the handle 8 are provided on both sides of the outer surface of the machine base 7.
-2 is pivotally supported, and the handle 8 is vertically movable around the pivot support 9 to adjust its vertical position. A position adjustment device M is provided between the bases 8-1 and 8-2 and the machine base 7.

The position adjustment device M includes a support plate 10 on a hollow machine base 7.
Adjustment rod 1 with a tapered circumferential surface is inserted through the
1 is provided to be able to slide up and down, and the bottom end is the operating section 1.
1', the adjustment rod 11 is urged downward by a spring 12 interposed between the upper surface of the machine base 7, and pin holes 13, 1 are provided on both sides of the machine base 7.
The left and right pins 14, 14' are configured to slide freely forward and backward from 3'. The base end surfaces of the left and right pins 14, 14' are concave semicircular arcs, and are shaped to face the tapered shape t of the adjustment rod 11 so as to be in close contact with each other. It has a tapered shape along the machine base 7.
Both arm bases 8- of the handle 8 located on both sides of the
1 and 8-2 have pin insertion holes 15-1 and 15-2 corresponding to the number of displacement stages for adjusting the vertical position of the handle.
2, 15-3...n are provided, and the left and right pins 14, 14' are configured to be insertable and removable into the pin insertion hole 15.
4' can be inserted and removed by lowering the adjusting rod 11 with spring bias, so that the tapered circumferential surface of the adjusting rod 11 moves the base end surfaces of the left and right pins 14, 14' outward. The left and right pin ends are inserted into the pin insertion hole 15 by pressing the same pin in the left and right direction, and the left and right pins 14, 14'
The removal is performed by pushing the adjusting rod 11 upward against the spring force, and pushing the left and right pins 14, 14' back from the outer opening of the pin insertion hole 15.

15 is a locking portion of the left and right pins 14, 14';
It is locked to the inner surface of the machine stand 7 so as not to protrude beyond a certain level from the machine stand 7.

The embodiment of this invention is constructed as described above, and when it is desired to adjust the position of the handle 8 up or down when working on the management machine a, the adjustment rod 11 is used.
The left and right pins 14, 1 are pushed up against the bias of the spring 12,
4' is no longer in contact with the tapered circumferential surface of the adjustment rod at the base end surface, and the left and right pins 14, 14' are in a free state, and the pin insertion holes 15 of the bases 8-1, 8-2 of the handle are inserted into the outer openings. The left and right pins are removed from the pin insertion holes 15 (see Fig. 2), and in this state, the handle 8 is vertically displaced to insert one of the pin insertion holes 15 into the pin holes 13, 13'. When the adjustment rod 11, which had been pushed up, is lowered by the spring force, the bases of the left and right pins 14, 14' are pushed outward, since the circumferential surface of the adjustment rod 11 is tapered. The spear and the same pin are inserted into the predetermined pin insertion holes 15 and are inserted into the machine base 7 and both arm bases 8-1 and 8 of the handle 8.
-2 (see Figure 3).

At this time, the operation of pushing up the operating part of the adjustment rod and the operation of pushing back the free left and right pins from the outer opening of the pin insertion hole do not require any tools, and can be performed smoothly with a single touch. It's easy to do.

Moreover, since the operating direction of the adjustment rod is upward, it is easy to perform the operation as well as the vertical position adjustment of the handle.

Furthermore, because the operating part of the adjustment rod protrudes downward from the support plate installed at the bottom of the machine base, rain and dew can drip down the operating part and enter the inside of the machine base, causing corrosion. Such problems will not occur.

According to this invention, the left and right pins can be inserted and removed through the tapered shape of the circumferential surface of the adjustment rod, so the vertical position and fixation of the handle can be reliably adjusted and fixed with a simple structure and without the use of any tools. There is an effect that can be done.

[Brief explanation of the drawing]

Figure 1 is a side view showing the tiller of the proposed device;
3 is a sectional view of the same essential part, FIG. 3 is a sectional view during the same operation, and FIG. 4 is a sectional view taken along the line shown in FIG. 3. 7...Machine base, 8...Handle, M...Position adjustment device, 10...Support plate, t...Tapered shape, 1
3, 13'...pin hole, 14, 14'...left and right pins, 15...pin insertion hole.

Claims (1)

[Scope of utility model registration request] Machine base 7 for attaching a handle with a hollow interior
Both arm bases 8-1, 8-2 of the handle 8 are pivoted so as to be vertically movable, and the arm bases 8-1, 8-2 and the machine base 7 are connected at the front part of the pivot support 9. A position adjustment device M is interposed between the support plate 10 provided at the bottom of the machine base 7, and the device M has a tapered circumferential surface t and a lower end with an operating portion 11'. A spring 12 is interposed between the adjusting rod 11 and the upper surface of the machine base 7 to bias the adjusting rod 11 downward. Left and right pins 14, 14' formed in semicircular arc-shaped recesses are disposed on the left and right sides of the tapered shape t so that their bases are in close contact with the tapered shape t.
The tips of both pins 14, 14' are configured to protrude from pin holes 13, 13' provided on both sides of the machine base 7 so as to be able to slide forward and backward.
The more protruding tips of the left and right pins 14, 14',
Both arm bases 8- are located opposite to each other on both sides of the machine base 7.
Adjustment of the vertical position of a handle of a walk-behind cultivator which can be inserted into and removed from pin insertion holes 15-1, 15-2, and 15-3 for adjusting the vertical position of the handle provided in multiple pins 1 and 8-2. structure.