JPH0221872Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention relates to a hand-operated type mower that is pushed and moved by the user to cut grass. This invention relates to a cutting blade angle changing device that changes the angle of a cutting blade and holds it fixed.

<Conventional technology> Conventionally, the clipper-type cutting blade angle changing device in this type of hand-operated mower has a cutting blade angle adjustment fitting that is rotatably mounted on the outside of a support frame to which the clipper-type cutting blade and engine are mounted and supported. The adjustment bracket is equipped with an axle that attaches and supports the wheels at both ends, and a lock pin that slides back and forth freely is inserted and installed, and the support frame at the front and rear of the cutting blade adjustment bracket is fitted. Fan-shaped cutting blade angle setting fittings are attached and fixed to the outside of the adjustment fittings from the front and back, respectively, and the locking pin is inserted into the setting fittings so that the clipper-type cutting blade can be moved to the mowing area. The handle is constructed by drilling a plurality of lock holes at appropriate intervals in the circumferential direction to securely hold the handle at an angle corresponding to the angle of the ground surface, and the lower end of the handle frame is attached and fixed to both ends of the axle. Equipped with a frame.

The angle of the clipper type cutting blade can be changed by moving the lock pin installed on the cutting blade angle adjustment fitting back and forth with the operating knob attached perpendicularly to the lock pin. The protruding end is inserted and locked into one of the lock holes of the cutting blade angle setting fitting, and the rod shaft of the operating knob is fitted and locked into the locking recess cut out in the cutting blade angle adjusting fitting. The angle of the clipper-type cutting blade is changed to correspond to the ground surface angle (inclination angle) of the mowing area, and the blade is held fixed.

In addition, as previously filed by the present applicant, a support frame on which a clipper-type cutting blade and an engine are attached and supported is attached to the lower end of the handle frame via a bracket, and an axle is mounted inside a connecting pipe that integrally supports the axle. At the same time, a cutting blade angle setting bracket is installed on the outside of the support frame and has a plurality of locking recesses at appropriate intervals in the circumferential direction. A screw rod or a lock pin is fixedly held at an angle corresponding to the ground surface angle of the mowing area by placing and locking the lower end in the lock recess of the mowing area. Some devices are equipped with a screw rod or lock pin that can be moved up and down, and an operating knob is attached to the upper end of the screw rod or lock pin.

However, for both the former and the latter, the angle of the clipper-type cutting blade must be changed by operating the operating knob installed at the bottom of the handle frame or near the connection between the support frame and the axle, so it is necessary to change the angle of the ground surface. Each time the operator approaches a mowing area, the engine must be stopped, the mowing operation must be stopped, and the angle of the clipper-type cutting blade must be changed, which reduces work efficiency.

<Problem to be solved by the invention> The problem to be solved by the invention is that when changing the angle of the clipper type cutting blade when approaching a mowing area where the ground surface angle is different during mowing work, To simply and easily perform an angle changing operation without interrupting grass mowing work.

<Means for solving the problem> The technical means taken by the present invention to solve the problem is a support in which a clipper-type cutting blade is provided at the tip and an engine that drives the cutting blade is mounted and supported at the rear end. In a hand-pushed mower, the frame and the handle frame are rotatably mounted and supported on an axle that connects two left and right wheels, and the angle of the clipper-type cutting blade can be changed. A support frame is passed through the connection pipe and rotatably supported with the tip side inclined upward with respect to the center of the connection pipe, and the outer periphery of the support frame is A cutting blade angle setting fitting having a plurality of locking recesses at appropriate intervals is installed and equipped on the cutting blade angle setting fitting, and a locking pin whose lower end is detachably connected and locked in each locking recess of the cutting blade angle setting fitting is erected from the connecting pipe. It is characterized in that it is mounted on a raised handle frame member, and its lock pin is connected to an operating lever that is mounted and equipped near a grip portion of the handle frame.

<Function> The present invention changes the angle of the clipper-type cutting blade by operating a lock pin that is attached to the bracket at the lower end of the hand frame so that it can swing freely or move up and down, and is operated by an operating lever that is attached and equipped near the grip of the handle frame. Do the following. In other words, the angle of the clipper type cutting blade can be changed at hand.

Further, when changing the angle of the cutting blade, the handle frame, which is rotatably supported in an inclined state within the connecting pipe, rotates with a pestle, and the cutting blade at the tip tilts while drawing a circular arc.

<Example> An example of the implementation of the present invention will be described based on the drawings. A hand-push mower is composed of a clipper-type cutting blade A, an engine B, a support frame C, a handle frame D, and a pair of left and right wheels E. This is a conventionally well-known device, in which a clipper-type cutting blade A is attached to the front end (tip) of the support frame C via a rotation converter F, and an engine B is attached to the rear end.
and the rotary converter F are connected by a power transmission shaft 1 having a built-in shaft extending through the entire length of the support frame C.

The handle frame D is used to manually drive the mower and to perform running operation (direction control ₎ . It consists of a connecting frame _D2 that connects the operating frame D1 to the support frame C, and the connecting frame _D2 and the operating frame _D1 are connected and fixed by _changing the angle of the operating frame _D1 according to the physique of the user. At the same time, a bracket 3 is attached to the lower end of the connecting frame _D2 .

The bracket 3 consists of a first member 3a made of a metal plate having a desired wall thickness bent into a substantially inverted V-shape on the sides, and an upper piece 3b ₁ whose upper end is further bent forward in a forward-sloping shape. The bracket 3 is attached by welding and fixing the rear piece _3a1 of the first member 3a to the lower end surface of the connecting frame _D2 .

Also, both the front and rear pieces 3a ₁ and 3a ₂ of the first member 3a
The lower end of the lower end of the second member 3b and the lower end of the lower piece 3b ₂ of the second member 3b are cut out in a substantially arc shape, and the connecting pipe 4 is fitted and welded.
The support frame C is placed inside this connecting pipe 4 as a core material.
A lock is rotatably fitted and attached via c ₁ , and is removably connected to the lower end of a lock pin 5, which will be described later, on one of the outer sides (front side) of the support frame C located at the front and rear ends of the connecting pipe 4. A cutting blade angle setting fitting 7 having a plurality of recessed portions 6 cut out at appropriate intervals in the circumferential direction is attached with a clamping fitting 8 and bolts 9.

On the other hand, a pair of upper and lower clamping fittings 10 are attached to the other outer side (rear side) of the support frame C with bolts 11 so that the connecting pipe 4 does not move in the cylindrical direction of the support frame C from the insertion and attachment position with the support frame C. Similarly, the above-mentioned core material _c1 , which sandwiches the connecting pipe 4 from the front and back by the cutting blade angle setting fittings 7, is fixed to the outer periphery of the support frame C while penetrating the support frame C in an eccentric manner. By rotatably fitting the core material c ₁ into the connecting pipe 4, the support frame C can be rotated with the tip end inclined upward with respect to the center l of the connecting pipe 4. I support it.

Therefore, when the support frame C is rotated,
The frame C rotates eccentrically in a mortar shape, and the cutting blade A
The tip of the frame C to which it is attached rotates in an arc, and the angle of the cutting blade A changes.

The above-mentioned lock pin 5 is engaged with the lock recess 6 in any one place of the cutting blade angle setting fitting 7 to set the angle of the cutting blade A at an angle corresponding to the ground surface angle (inclination angle) of the mowing area. In addition to holding it in place,
By operating an operating lever 12, which will be described later, the lower end connected in a lock recess 6 is released from its engaged state and swings (engages and disengages) so as to be connected and locked in another lock recess 6. It is.

This lock pin 5 is made by cutting a metal bar having a thickness that matches the bottom of the lock recess 6 and its surroundings to a desired length, bending it into a dogleg shape in cross section, and crushing the upper end into a flat shape. A connecting portion 5a connecting one end of the wire 13 is formed.

Additionally, a pivot hole 5 is provided at the bent portion of the lock pin 5.
b is bored in a through hole, and a supporting piece 14 is mounted between the lower piece 3b of the second member 3b constituting the bracket ₃ and welded in a protruding manner so as to face the upper part of the inner surface of the bracket 3. A locking pin 5 is attached to the second member 3b so that the pivot 15 is inserted into the second member 3b so as to swing around the center, and a locking pin 5 is inserted through the upper piece _3b1 of the second member 3b through the connecting tool 16. One end of a wire (wire harness) 13 whose outer side is connected and fixed and which is wrapped around a rubber tube 17 is connected to the connecting portion 5a at the upper end of the lock pin 5 using a connecting tool 18. In the figure, 19 indicates the connecting portion 5a of the lock pin 5 and the upper piece 3b ₁ of the second member 3b.
This is a pressure spring that is wound around the outside of the wire 13 between the inner surface and the lower end of the lock pin 5 and locks it in the lock recess 6 of the cutting blade angle setting fitting 7 by the pressure force of this pressure spring 19. to hold and fix the cutting blade A.

The operating lever 12 swings the lock pin 5 to engage and lock the lower end of the lock pin 5 in the lock recess 6 of the cutting blade angle setting fitting 7, or releases the engaged state to lock the cutting blade A. The wire 13 is attached to the outside of the operating frame 12 in the vicinity of the grip portion 2 of the handle frame D, and the other end of the wire 13 is connected to the lock pin 5.

In this embodiment, the locking pin 5 and the locking recess 6 of the cutting blade angle setting fitting 7 are locked together by squeezing and releasing the operating lever 12 provided on one side of the grip 2 of the handle frame D. The angle of the cutting blade A can be easily and easily changed by releasing it (as shown by the two-dot chain line in FIG. 3) and reconnecting and locking it.

That is, while mowing, the mowing blade A is set to correspond to the ground surface of the mowing area, for example, the embankment near the road, or the mowing surface _G1 of the ridge G that is raised in the border of the rice fields shown in the figure. When approaching another glue surface G ₁ whose inclination angle is different from that of surface G ₁ ,
The user releases the locking state of the lock pin 5 from the lock recess 6 of the cutting blade angle setting fitting 7 by gripping the operating lever 2 while operating the mower while driving the mower. In other words, the cutting blade A is connected to the support frame C. With this, it becomes possible to rotate freely. Then, the user tilts the mower using one of the wheels E as a fulcrum so that the cutting blade A rotates in accordance with the above-mentioned angle _G1 , and releases the operating lever D. The cutting blade A is inserted into the other locking recess 6 of the cutting blade angle setting fitting 7 located in a form corresponding to the cutting surface _G1 , and is coupled and locked in the recess 6, so that the cutting blade A is aligned with the cutting surface G1.
It is designed so that it can be fixed and held at an angle corresponding to the inclination angle of _G1 . That is, it is possible to change the angle of the cutting blade A at hand without interrupting the mowing operation.

Furthermore, as described above, since the tip of the support frame C rotates eccentrically in the shape of a pestle, the cutting blade A attached to the tip of the frame C tilts to one side of the mower. Therefore, the axle E is the ridge G
The cutting blade A can widely cut the paste surface _G1 while traveling on the surface.

In the above embodiment, the lock pin 5 is oscillated so that its lower end can be freely engaged and disengaged from the lock recess 6 of the cutting blade angle setting fitting 7, but the second member 3b constituting the bracket 3 is The second member is formed by bending it into a U-shape on the side and attaching the front piece 3a ₂ of the first member 3a.
A lock pin 5 is welded and fixed to the upper front surface of the second member and vertically opposed to each other in parallel, and a lock pin 5 is provided therethrough so as to be movable up and down.
A clamping ring is attached to the outside of the middle part, and a lock pin 5 is installed between the clamping ring and the upper piece of the second member.
The cutting blade is equipped with a pressing spring wound around the outside of the cutting blade, and one end of the wire 13, which is attached to the upper part of the second member via the connector 16 and projected, is connected to the lock pin 5 as an angle changing device. It may also have a structure (form) that changes the angle of A.

<Effects of the invention> Since the invention is constructed as described above,
Even if the ground reaches a slope during mowing work, the angle of the cutting blade can be changed to correspond to the slope of the ground by operating the control lever, and the blade can be mowed continuously while keeping the cutting blade in line with the ground. can proceed.

In addition, since the mowing blade whose angle has been changed is tilted away from the center of the mower toward the sloped surface, for example, when mowing the grass on one side while driving on a ridge, the wheels can be used to move over the ridge. This allows you to cut a wide area of grass on one side while driving.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention; FIG. 1 is a side view with a part cut away, FIG. 2 is a front view of the same, FIG. The figure is an enlarged cross-sectional view taken along the line -- in FIG. 3, and FIG. 5 is a front view showing a state in which the cutting blade is fixed and held at an angle corresponding to the ground surface of the mowing area (the surface of the ridge). In the diagram, A: clipper type cutting blade, B: engine,
C: Support frame, D: Handle frame, E:
Wheel, 2: Grip, 3: Bracket, 4: Connecting pipe, 5: Lock pin, 6: Lock recess, 7: Cutting blade angle setting fitting, 12: Operation lever, 13: Wire.

Claims (1)

[Scope of utility model registration request] A support frame is provided with a clipper-type cutting blade at the tip and an engine for driving the cutting blade is mounted and supported at the rear end, and a handle frame is rotatably mounted and supported on an axle connecting two left and right wheels. ,
In a hand-held mower that allows the angle of the clipper-type cutting blade to be changed, the support frame and the axle are connected via a connecting pipe, and the supporting frame is passed through the connecting pipe. The cutting blade angle setting bracket is rotatably supported with the tip side inclined upward with respect to the center core, and a cutting blade angle setting fitting with a plurality of locking recesses at appropriate intervals is attached to the outer periphery of this support frame, and the cutting blade angle can be set. An operating lever comprising: a lock pin whose lower end is removably connected and locked in each lock recess of the metal fitting; the lock pin is attached to a handle frame member raised from the connecting pipe; and the lock pin is attached near a grip portion of the handle frame. A device for changing the angle of a cutting blade in a hand-held mower.