JPH08116751A - Clipper-type bush cutter - Google Patents

Abstract

PURPOSE: To smooth the sliding motion of a cutting blade and reduce the vibration and noise by supplying a lubricating oil to the cutting blade with an oiling device, to reduce the weight and the cost by simplifying the overall structure of the oiling device and the structure of a pump and to increase the capacity of the storage part of the lubricating oil. CONSTITUTION: This clipper-type bush cutter is provided with an oiling device M to supply a lubricating oil to the sliding face of cutting blades 14, 15 and a protector 30 having a front handle 35 on the side wall. The protector 30 is composed of a protector supporting member and a hollow main body 31 having a storage part 33a for storing the lubricating oil in the main body. A flexible dome cap 32 is placed on the oil-feeding port 50 of the hollow main body 31. The oiling device M is provided with valves 41, 52 and an oil feeding part S and the lubricating oil is supplied from the storage part 33a through the valve 41 to the oil feeding part S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clipper type brush cutter such as a hedge trimmer, and more particularly, to an oil supply device in which a pair of upper and lower cutting blades are relatively reciprocated via a power transmission means such as an eccentric cam. Related to clipper type brush cutter.

[0002]

2. Description of the Related Art A hair clipper such as a hedge trimmer for mowing weeds on ridges or irrigation canals, mowing lawns, mowing hedges, etc. The output from the source is transmitted to a cutting blade device via a power transmission device, and a pair of upper and lower elongated cutting blades are relatively reciprocally moved in the longitudinal direction to cut plants.

In the conventional clipper-type brush cutter of this type, when the brush cutting operation is performed, grass juice or the like enters the sliding surfaces of the two stacked hair clipper blades, and mud or the like is mixed therein. It hardens and it interferes with the sliding operation of the hair clipper blade, etc., the resistance on the sliding surface during the sliding operation of the hair clipper blade increases, the load on the drive part increases, and the vibration and noise increase. Therefore, there is a problem that the fatigue of the worker increases.

In order to deal with such a problem, a means for appropriately supplying a lubricant such as grease to the sliding surfaces of the two clipper blades during reciprocating movement has been proposed, while sliding of the upper and lower clipper blades has been proposed. According to the present invention, there is provided a brush cutter in which an oil groove is provided in a longitudinal direction on a surface, the oil groove is communicated with a lubricating oil tank provided on a main body case through a cock, and oil flows down by gravity to lubricate a sliding surface. Proposed by the applicant of
No. 33130).

Further, the applicant of the present invention provides an oil supply device to the clipper type brush cutter, and an automatic or manual oil pump is provided in the oil supply device, and lubricating oil discharged from the oil pump is applied to the surface of the cutting blade. Proposed the one equipped with an oil supply means for supplying to the blade side (Japanese Patent Application No. 6-55754).
are doing. Further, in the oil supply device provided with the manual oil pump of the proposed clipper type brush cutter, the inside of the protector having the handle fixed to the side surface is formed in a hollow shape to serve as a storage portion for the lubricating oil, and the protector of the protector is formed. A structure in which one end portion is opened to form a cylinder portion, a piston is reciprocally fitted in the cylinder portion, and a pressure function is provided between an inner end of the piston and an inner wall of the cylinder to perform a pump function. Is proposed as.

[0006]

DISCLOSURE OF THE INVENTION In a clipper type brush cutter equipped with a manual oil pump inside a protector to which a handle of the prior art proposed as described above is fixed, a capacity as a storage portion of lubricating oil is large. The structure of the pump itself is complicated because the space occupied by the manual oil pump is limited and the manual oil pump reciprocates the piston in the cylinder. There is also a problem that the weight of the protector itself becomes heavy.

Further, since the protector is provided with a pump inside, the structure of the protector itself is complicated and the manufacturing is troublesome. The present invention has been made in view of the above problems of the clipper type brush cutter of the prior art, and an object of the present invention is to supply lubricating oil to a cutting blade by an oil supply device, While smoothing the sliding motion of the machine to reduce vibration and noise, the structure of the entire oil supply device and the structure of the pump are simplified to make the structure lighter and cheaper, and the capacity of the lubricating oil reservoir can be increased. The purpose is to provide a brush cutter.

[0008]

In order to achieve the above object, a clipper type brush cutter according to the present invention has an oil supply device for supplying lubricating oil to a sliding surface of a cutting blade and a front handle fixed to a side wall portion. With a protector, the protector is composed of a hollow body and a protector support body having a reservoir for storing lubricating oil therein, and a flexible dome cap is provided at the oil supply port of the hollow body,
The oil supply device includes a valve and an oil feed unit, and the lubricating oil is supplied from the storage unit to the oil feed unit through the valve.

More specifically, in the flexible dome cap, a check valve is arranged inside the flexible dome cap so as to function as a closing lid for the lubricating oil supply port to the storage portion and the inside of the storage portion. And a function of a pressurizer for pressurizing the lubricating oil. Further, the valve of the refueling device,
It is composed of an on-off valve or a check valve, and supply / stop of lubricating oil from the storage section to the oil supply section,
Alternatively, it prevents backflow.

[0010]

[Operation] In the hair clipper-type brush cutter according to the present invention configured as described above, the lubricating oil in the reservoir is pressurized by the action of the flexible dome cap as a pressurizer. . The pressurized lubricating oil is discharged from the reservoir by the pressurized pressure, passes through the on-off valve or the check valve, and supplies the oil such as an oil passage formed in the support plate of the cutting blade. Is supplied to the blade surface of the cutting blade through the section. Then, the lubricating oil that has flowed out onto the cutting blade gradually exudes to the sliding surfaces of the cutting blades as the cutting blade reciprocates, and lubricates the sliding surface of the cutting blade.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an overall outline of an example of a clipper type brush cutter to which the present invention is applied. The clipper-type brush cutter 1 of the illustrated example includes a pair of upper and lower elongated clipper-type cutting blades 14 and 15 supported by a cutting blade support plate 20 so as to be relatively reciprocally movable in the longitudinal direction. 14, 1
5, a prime mover 11 such as a small air-cooled two-cycle gasoline engine or an electric motor is provided at the rear end portion of the cutting blade 5, and the rotary driving force from the prime mover 11 is reciprocatingly driven through a power transmission means (not shown) as the cutting blades 14 and 15. It is designed to be transmitted to. The prime mover 11 is provided with a rear handle 22, and the cutting blade support plate 20 is provided with a protector 30. The protector 30 includes a hollow body 31 and a protector support 34 (described later) having a front handle 35, and a storage portion 33a (described later) for storing lubricating oil is formed inside the hollow body 31. It The front handle 35 is fitted and covered with a grip 35a made of a material having appropriate elasticity such as rubber or synthetic resin.

Further, the hollow main body 31 of the protector 30 is provided with a flexible dome cap 32 for closing the storage portion 33a. The protector 30
Is provided in order to protect the hand holding the front handle 35 during the brush cutting work. In the work, the rear handle 22 is held by the left hand to hold the machine body and the throttle trigger 22a is provided. Then, the prime mover 11
And the front handle 35 is held by the right hand to control the working operation of the cutting blades 14 and 15.

A fuel tank 23 is provided at the rear of the prime mover 11, and an air cleaner 2 is provided at the side of the fuel tank 23.
4 etc. are provided. Further, if necessary, a grass gathering plate 21 having a substantially L-shaped cross section in which the rear edge of the horizontal portion is bent upward is provided from the center of the upper surface of the cutting blade support plate 20 to the tip portion. Next, the configuration of an embodiment of the clipper type brush cutter according to the present invention will be described in detail.

2 is a partially cutaway side view of the protector 30 as seen from the direction of arrow II in FIG. 1, and FIG.
FIG. 4 is a side view of the protector 30 seen from the direction, FIG. 4 is a plan view of the protector 30 seen from the direction of arrow IV in FIG. 1, and FIG. 5 is a bottom view of the protector 30 seen from the direction of arrow V of FIG. The protector 30 of the illustrated example
Is the storage portion 33a that stores lubricating oil on the left and right sides inside.
And a hollow main body 31 having a hollow portion 33b, and the protector support 34 for fixing the protector 30 to the cutting blade support plate 20. The protector support 34 is a fixed portion 3 to the cutting blade support plate 20.
4a and a supporting portion 34b for supporting and fixing the hollow body 31
Further, as shown in FIG. 6, the front handle 35 is integrally molded with the support portion 34b of the protector support 34 by molding or the like.

The hollow main body 31 and the protector support 34 are formed by inserting the front handle 35 into a through hole 36 formed in the central portion of the hollow main body 31.
They are contact-joined to each other and fixed to the upper and lower portions of the front handle 35 by a fixing bolt 37 and a fixing nut 38. As shown in FIG. 7, a mounting hole 39 is formed in the fixed portion 34a of the protector support 34, and a mounting bolt 40 is inserted into the mounting hole 39 (see FIG. 4). The protector 30 is attached to the cutting blade support plate 20 by screwing it into the cutting blade support plate 20.

As shown in FIGS. 6 and 7, an opening / closing valve 41 is arranged at the lower center of the hollow body 31 and is screwed to the hollow body 31 by a valve fixing screw 49. An inlet pipe 43 and an outlet pipe 44 are integrally fixed to the on-off valve 41, and the inlet pipe 43 is an inlet side flexible pipe 46.
Is connected to the lubricating oil take-out pipe 48 of the storage portion 33a of the hollow main body 31, and the outlet pipe 44 is connected to the outlet-side flexible pipe 47. Then, by rotating the valve body 42 of the opening / closing valve 41, the through hole 45 formed in the valve body 42 is connected / disconnected to the inlet pipe 43 and the outlet pipe 44, and The on-off valve 41 is opened and closed.

The lower part shown in FIG. 2 shows the oil feed section S of the IX-IX cross section of FIG. The oil feeding section S
The cutting blade support plate 20 constituting the above-mentioned is formed with an elongated lubricating oil flow path 20a in the lateral direction, and the oil for allowing the lubricating oil to exude and be supplied to the blade portions 14b, 15b side of the cutting blades 14, 15 is formed. The supply ports 20b, 20b ... Are formed in the bottom of the blade 14b near the root. Further, the oil injection nipple 17 is screwed and fixed to the upper surface of the cutting blade support plate 20 by a screw-in portion 17a integral with the nipple 17. The oil injection nipple 17 is provided with an oil injection flow path 17b penetrating in the axial direction, and one end of the outlet side flexible tube 47 is externally fitted and fixed to the upper portion of the oil injection nipple 17. .

The flexible dome cap 32 is made of an elastic material such as rubber or synthetic resin,
As shown in FIG. 2, the flexible dome cap 32 is externally fitted and attached to a supply lip portion 50a forming an oil supply port 50 above the storage portion 33a of the lubricating oil of the hollow body 31 of the protector 30. . A support plate 5 fitted with a duckbill check valve 51 by the end surface of the supply lip portion 50 and the inward flange portion 32b of the flexible dome cap 32.
1a is clamped. Further, a vent hole 32a having a very small diameter is formed at the top of the flexible dome cap 32.

The flexible dome cap 32 has the oil supply port 5 for injecting lubricating oil into the storage portion 33a.
In addition to having a function as a lid for closing 0a, it also has a function as a pressurizer for pressurizing the lubricating oil in the storage portion 33a in cooperation with the check valve 51. That is, the flexible dome cap 32 is attached to the supply lip 50 of the oil supply port 50 of the hollow body 31.
By removing it from a, the lubricating oil can be supplied and replenished from the oil supply port 50 into the storage portion 33a, and the operator puts his / her finger on the top of the flexible dome cap 32, When the flexible dome cap 32 is pressed while blocking the 32a, the flexible dome cap 32 is deformed and deformed to increase the air pressure in the flexible dome cap 32, and the tongue-shaped valve element 51b of the check valve 51 is opened to apply the pressure. The compressed air is supplied to the storage portion 33a, and the storage portion 33a
Increase the air pressure inside. Then, when the worker loosens the pressing force of the finger and releases the vent hole 32a from the finger, the outside air enters the flexible dome cap 32 through the vent hole 32a and returns to the state before pressurization. The check valve 50 is closed, and the operation of one time is completed and the function as a pressurizer is achieved. By repeating the above operation, the air pressure in the lubricating oil upper space in the storage portion 33a can be gradually increased.

Next, the operation and operation of the clipper type brush cutter according to the embodiment of the present invention thus constructed will be described. The prime mover 11 is driven, and the upper and lower cutting blades 14, 1 are driven through a drive mechanism (not shown) such as a reduction gear and an eccentric cam.
5 is reciprocally driven in the opposite direction in the front-rear direction, and while holding the aircraft by holding the rear handle 22 with the left hand,
The prime mover 11 is controlled by the throttle trigger 22a, the front handle 35 is held by the right hand, and the cutting blade 14,
While controlling the work operation of 15, the cutting blades 14, 1
Cut the plants and other plants by 5 and carry out the mowing work.

The position of the valve body 42 of the on-off valve 41 shown in FIGS. 2, 6 and 7 is such that the valve is opened and lubricating oil is supplied to the cutting blades 14 and 15 via the on-off valve 41. As shown in the figure, when the refueling device M is in a non-operating state, the valve body 42 is rotated 90 ° from the position shown in the figure and the on-off valve 41 is placed in a closed state. When the operator puts his / her finger on the top of the flexible dome cap 32, presses the vent hole 32a while closing the vent hole 32a, and repeats a series of operations in which the pressurization is released in a non-operating state of the oil supply device M. The internal pressure of the storage portion 33a gradually increases due to the air compression function. When the on-off valve 41 is turned to the state shown in FIGS. 2, 6 and 7 in a state where the internal pressure of the storage portion 33a is appropriately increased, the lubricating oil in the storage portion 33a is stored in the storage portion 33a. Due to the increased internal pressure of 33a, the lubricating oil extraction pipe 48 of the storage portion 33a, the inlet side flexible pipe 46, the through hole 4 of the on-off valve 41.
5, through the outlet flexible tube 47 and the oil injection nipple 17, a lubricating oil flow passage 20 which is elongated in the lateral direction of the cutting blade support plate 20 which constitutes the oil feeding portion S.
is supplied to a. The lubricating oil supplied to the lubricating oil passage 20a is discharged to the blade portion 14b side of the cutting blade 14 through the oil supply ports 20b, 20b. Then, the lubricating oil flowing out to the upper surface of the cutting blade 14 gradually exudes on the sliding surface of the cutting blades 14 and 15 as the sliding operation of the upper and lower cutting blades 14 and 15 in the front-rear direction progresses. , Lubricate the sliding surface.

As described above, in one embodiment of the present invention, the storage portion 33a of the protector 30 is formed by using the flexible dome cap 32 having the check valve 50.
If the lubricating oil inside is placed under pressure, the cutting blades 14 and 15
When it is desired to supply the lubricating oil, the opening / closing valve 41 is simply rotated to reliably supply the lubricating oil while the lubricating oil in the storage portion 33a is under pressure.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment,
Various modifications can be made without departing from the invention described in the claims. Therefore, a lubricating oil supply device according to another embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the same parts and members as those in the above-described embodiment are designated by the same reference numerals, and duplicate explanations are omitted.

In this embodiment, the flexible dome cap 32 is not provided with a check valve and the ventilation hole 32a is not formed. The other structure is the same as that of the above-described embodiment. In addition, the hollow portion inside the hollow body 31 of the protector 30 is such that the left and right side hollow portions communicate with each other at the upper and lower portions, respectively, and both sides of the hollow portion inside the hollow body 31 are reserved for lubricating oil. Composed as a part.

A feature of this embodiment is that a check valve 52 is arranged in place of the opening / closing valve 41 of the oil supply apparatus M in the above-described embodiment. As shown in FIG. 11, an inlet pipe 53 and an outlet pipe 54 are integrally arranged at both ends of the check valve 52. A cylindrical space 55 is provided in the central portion of the check valve 52, and the pipes 5 arranged at both ends thereof are provided.
Through holes 53a and 54a are formed in the holes 3 and 54, respectively. A spherical body 56 made of steel or the like is arranged in the cylindrical cavity 55, and the spherical body 56 is formed by a coil spring 57 and an adjusting screw body 58 so that the pipe through hole 53 of the inlet pipe 53 is formed.
It is biased so as to close the valve seat 53b at the end of a. By rotating the adjusting screw body 58 to change the position of the adjusting screw body 58, the compression force of the coil spring 57, that is, the valve opening pressure of the check valve 52 can be adjusted.

In the present embodiment, as shown in FIG. 12, a duck bill type check valve 61 for inflowing outside air is provided above the storage portion 33a. Next, the operation / operation of the oil supply apparatus M of the present embodiment configured as described above will be described. The state in which the sphere 56 of the check valve 52 is at the position shown in FIGS. 10 and 11 indicates that the refueling device M is in the inoperative state.

In such a non-operating state, when an operator puts a finger on the top of the flexible dome cap 32 and presses it, the flexible dome cap 32 is flexed and deformed to reduce its internal volume. . Due to its volume reduction,
The internal pressure of the storage portion 33a communicating with the inside of the flexible dome cap 32 increases. This increase in internal pressure pressurizes the lubricating oil in the storage portion 33a, and this pressure is applied to the check valve 52 via the lubricating oil take-out pipe 48 and the inlet side flexible pipe 46 of the storage portion 33a. It is also transmitted to the lubricating oil guided to the through hole 53a of the inlet pipe 53. As the lubricating oil pressure in the through hole 53a rises, the spherical body 56 moves to the coil spring 57.
Against the pressing force of the through hole 53a, away from the valve seat 53b of the through hole 53a, the lubricating oil in the through hole 53a flows into the cylindrical space 55, and further, the outlet side flexible tube 47, and Through the oil injecting nipple 17, the oil is supplied to the elongated lubricating oil flow passage 20a in the lateral direction of the cutting blade support plate 20 that constitutes the oil feeding portion S.

When the pressing of the flexible dome cap 32 is stopped and the inside of the storage portion 33a is in a negative pressure state,
The outside air flows in from the duck bill type check valve 61 for the outside air inflow, and the negative pressure state in the storage portion 33a is eliminated. In the present embodiment, each time the operator puts a finger on the top of the flexible dome cap 32 and presses it, the storage part 3
The lubricating oil in 3a is pressurized and supplied to the lubricating oil flow path 20a via the check valve 52. When the pressing is stopped, the lubricating oil is not supplied immediately.

Further, although the on-off valve is not provided in this embodiment, the check valve 52 and the on-off valve may be installed in series, and a ventilation hole may be provided at the top of the flexible dome cap 32. Of course, the check valve may be provided inside the flexible dome cap 32. Further, in the present invention, as shown in FIG. 13, in constructing the oil feeding section S, an oil pipe 59 is used instead of the outlet side flexible tube 47, and the oil pipe 59 is used for the cutting blade support plate. 20 may be extended to the tip (front) direction and connected to the oil nipples 17, 17, ... Via a plurality of branch pipes 60, 60 ,.

Furthermore, in one embodiment of the present invention,
The storage portion 33a for lubricating oil is the hollow body 31.
Although it is provided on only one side, it is needless to say that it can be configured to be provided on both sides. Of course, it is also possible to put a disinfecting liquid in the storage portion 33a in place of the lubricating oil, and to disinfect the cut end simultaneously with the mowing work.

[0031]

As can be understood from the above description, according to the present invention, the reservoir for lubricating oil is formed by utilizing the internal space of the protector. It is not necessary to separately provide it, and the member that doubles as a lid that closes the oil supply port of the reservoir is used to pressurize the lubricating oil in the reservoir, so a separate pump for lubricating oil with a different structure is used as a protector. The structure is simple without having to prepare for parts. Further, since a pump having a separate structure is not required, the capacity of the storage portion in the protector can be increased and the weight of the protector can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall outline of an example of a clipper-type brush cutter to which the present invention is applied.

FIG. 2 is a partially cutaway side view of the protector 30 as seen from the direction of arrow II in FIG.

3 is a side view of the protector 30 as seen from the direction of arrow III in FIG.

4 is the protector 3 as seen from the direction of arrow IV in FIG.
FIG.

5 is the protector 3 seen from the direction of arrow V in FIG.
The bottom view of 0.

6 is a sectional view taken along the line VI-VI in FIG.

7 is a sectional view taken along the line VII-VII in FIG. 6;

8 is a sectional view taken along the line VIII-VIII in FIG.

9 is a protector 30 seen from the direction of arrow II in FIG.
The side view of (another example).

10 is a bottom view of the protector 30 (another example) viewed from the direction of arrow V in FIG. 1. FIG.

FIG. 11 is an enlarged cross-sectional view of the check valve 52.

12 is a cross-sectional view taken along the line VI-VI of FIG. 3 (another example).

FIG. 13 is a perspective view showing an oil feeding unit S (another example).

[Explanation of symbols]

 M ... Oil supply device S ... Oil feeding unit 14 ... Cutting blade 15 ... Cutting blade 30 ... Protector 31 ... Hollow body 32 ... Flexible dome cap 32a ... Vent hole 33a ... Reservoir 34 ... Protector support 35 ... Front handle 41 On-off valve 50 ... Oil supply port 51 ... Check valve 52 ... Check valve 61 ... Check valve for inflowing outside air

Claims (7)

[Claims] 1. A clipper-type brush cutter provided with an oil supply device (M) for supplying lubricating oil to the sliding surfaces of the cutting blades (14, 15) and a protector (30) having a front handle (35) on a side wall thereof. The hollow main body 31 is formed as a storage portion 33a for storing lubricating oil and the protector support 34, and the flexible dome cap 32 is provided at the oil supply port 50 of the hollow main body 31. Characteristic clipper type brush cutter. 2. The clipper type brush cutter according to claim 1, wherein the flexible dome cap 32 is made of an elastic material such as rubber or synthetic resin. 3. The oil supply device M includes valves 41 and 52 and an oil supply section S, and lubricating oil is supplied to the oil supply section S from the storage section 33a through the valves 41 and 52. The clipper type brush cutter according to claim 1 or 2, characterized in that: 4. The clipper type brush cutter according to claim 3, wherein the valves 41 and 52 are opening / closing valves or check valves. 5. The flexible dome cap 32 is provided with a ventilation hole 32a, and the flexible dome cap 32 is provided with a ventilation hole 32a.
The clipper type brush cutter according to any one of claims 1 to 4, wherein a check valve 51 is arranged therein. 6. The clipper-type brush cutter according to claim 1, wherein a check valve 61 for inflowing outside air is arranged above the storage portion 33a. 7. The hollow portion of the hollow main body 31 of the protector 30 is divided into left and right parts at the center, and one or both of the hollow parts is used as the lubricating oil storage portion 33a, and the valve 4
7. The hair clipper-type brush cutter according to claim 1, wherein 1, 52 are arranged in the lower central portion of the protector 30.