JP3138395B2 - Hair clipper type brush cutter - Google Patents

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 a lubricating apparatus in which a pair of upper and lower cutting blades are relatively reciprocated via power transmission means such as an eccentric cam. The present invention relates to a clipper-type brush cutter.

[0002]

2. Description of the Related Art In a clipper-type trimmer such as a hedge trimmer, which cuts vegetation such as cutting weeds, cutting grass, cutting hedges, etc. on a levee or an irrigation canal, the power of an engine or the like is usually used. 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 reciprocated in the longitudinal direction to cut vegetation.

[0003] In this type of conventional clipper-type brush cutter, when cutting is performed, grass juice or the like enters the sliding surfaces of the two stacked clippers blades, and mud or the like enters the sliding surface. And the sliding operation of the clipper blade and the like is hindered, the resistance on the sliding surface during the sliding operation of the clipper blade increases, the load on the driving unit increases, and vibration and noise increase. Therefore, there was a problem that the operator's fatigue increased.

In order to cope with such inconveniences, there has been proposed a means for appropriately supplying a lubricant such as grease to the sliding surface of the two hair clipper blades during reciprocating motion. According to the present invention, there is provided a brush cutter in which an oil groove is provided in a surface in a longitudinal direction, and a lubricating oil tank provided in a main body case is communicated through a cock through a cock so that 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 supplies an automatic or manual oil pump to the oil supply device and lubricating oil discharged from the oil pump to the surface of the cutting blade. Proposed with oil supply means for supplying to the blade side (Japanese Patent Application No. 6-55754)
are doing. The oil supply device provided with the manual oil pump of the proposed hair clipper-type brush cutter has a hollow protector having a handle fixed to a side surface, and a lubricating oil storage portion. One end is opened to form a cylinder portion, a piston is reciprocally fitted in the cylinder, and a pump function is provided between the inner end of the piston and the inner wall of the cylinder as a pressure chamber. It has been proposed as.

[0006]

In the hair clipper type brush cutter provided with a manual oil pump inside the protector to which the handle of the prior art proposed as described above is fixed, the capacity of the lubricating oil reservoir is limited. The structure is limited by the space occupied by the manual oil pump, and the manual oil pump is of a type in which a piston is reciprocated in a cylinder. There is a problem that the weight of the protector itself becomes heavy.

Further, since a pump is provided inside the protector, the structure of the protector itself is complicated, and the production is troublesome. The present invention has been made in view of such a problem of the prior art clipper-type brush cutter, and an object of the present invention is to supply lubricating oil to the cutting blade by an oil supply device, and to particularly provide the cutting blade. The clipper can reduce the vibration and noise by smoothing the sliding operation of the lubricating unit, simplify the structure of the entire lubricating device and the structure of the pump, make it lightweight and inexpensive, and increase the capacity of the lubricating oil storage unit. It is to provide a shape 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. The protector comprises a hollow body and a protector support having a storage portion for storing lubricating oil therein, and a flexible dome cap is provided at an oil supply port of the hollow body.
The oil supply device includes a valve and an oil supply unit, and supplies lubricating oil from the storage unit to the oil supply unit via the valve.

More specifically, in the flexible dome cap, a check valve is disposed inside the flexible dome cap, and the function of a closing lid for supplying lubricating oil to the storage portion and the inside of the storage portion are checked. And a function of a pressurizer for pressurizing the lubricating oil. Further, the valve of the refueling device,
Supply and stop of lubricating oil from the storage unit to the oil supply unit, comprising an on-off valve or a check valve,
Alternatively, the backflow is prevented.

[0010]

In the clipper-type brush cutter according to the present invention configured as described above, the lubricating oil in the storage section is pressurized by the action of the pressurizer due to the expansion and contraction of the flexible dome cap. . 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 supply such as an oil passage formed in a support plate of the cutting blade. Is supplied to the blade surface of the cutting blade through the section. Then, the lubricating oil flowing out onto the cutting blade gradually exudes to the sliding surfaces of the cutting blades with the reciprocating sliding operation of the cutting blades, and lubricates the sliding surfaces of the cutting blades.

[0011]

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 in the illustrated example includes a pair of upper and lower elongated clipper-shaped cutting blades 14 and 15 supported by a cutting blade support plate 20 so as to be relatively reciprocable 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, and the rotating blades from the prime mover 11 are reciprocated through a power transmission means (not shown) as reciprocating drive forces. To be communicated to. The motor 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 below) having a front handle 35, and a storage portion 33a (described below) for storing lubricating oil is formed inside the hollow body 31. You. The front handle 35 is fitted and covered with a grip 35a made of a material having an appropriate elasticity such as rubber or synthetic resin.

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

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

FIG. 2 is a partially cutaway side view of the protector 30 as viewed from the direction of arrow II in FIG. 1, and FIG.
FIG. 4 is a side view of the protector 30 as viewed from the direction, FIG. 4 is a plan view of the protector 30 as viewed from the direction of arrow IV in FIG. 1, and FIG. 5 is a bottom view of the protector 30 as viewed from the direction of arrow V in FIG. The protector 30 in the illustrated example
Is a storage section 33a for storing lubricating oil on the left and right inside.
And the hollow body 33 formed with the 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 fixed to the cutting blade support plate 20.
4a and a support portion 34b for supporting and fixing the hollow body 31
Further, as shown in FIG. 6, the front handle 35 is formed integrally 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 connected to each other by inserting the front handle 35 through a through hole 36 formed in the center of the hollow main body 31.
The front handle 35 is fixed by a fixing bolt 37 and a fixing nut 38 at the upper and lower portions of the front handle 35. 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 through the mounting hole 39 (see FIG. 4). The protector 30 is attached to the cutting blade support plate 20 by screwing into the cutting blade support plate 20.

As shown in FIGS. 6 and 7, an opening / closing valve 41 is disposed at the center lower portion 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.
The outlet pipe 44 is connected to an outlet-side flexible pipe 47 via a lubricating oil outlet pipe 48 of the storage portion 33a of the hollow main body 31 via the through hole. Then, by rotating the valve element 42 of the on-off valve 41, a through hole 45 formed in the valve element 42 is communicated / not communicated with the inlet pipe 43 and the outlet pipe 44, The on-off valve 41 is opened and closed.

The lower part of FIG. 2 shows the oil supply section S in the cross section IX-IX of FIG. The oil supply section S
The cutting blade support plate 20 is formed with a lubricating oil flow passage 20a which is elongated in the lateral direction, and which supplies the lubricating oil to the cutting blades 14 and 15 on the side of the blade portions 14b and 15b. Are formed at the bottom of the blade portion 14b near the root. Further, an oil injection nipple 17 is screw-fixed to the upper surface of the cutting blade support plate 20 by a threaded portion 17a integral with the nipple 17. The oil injection nipple 17 is provided with an oil injection channel 17b penetrating in the axial direction, and an upper end of the oil injection nipple 17 is fixedly fitted with one end of the outlet side flexible tube 47. .

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 to a supply lip 50a constituting an oil supply port 50 above the reservoir 33a for the lubricating oil of the hollow body 31 of the protector 30. . A support plate 5 in which a duckbill check valve 51 is fitted by the end face of the supply lip 50 and the inward flange 32b of the flexible dome cap 32.
1a is pinched. A very small diameter vent hole 32a is formed in the top of the flexible dome cap 32.

The flexible dome cap 32 is provided with the oil supply port 5 for injecting lubricating oil into the storage section 33a.
In addition to having a function as a lid for closing Oa, it also has a function of a pressurizer for pressurizing the lubricating oil in the storage portion 33a by cooperating with the check valve 51. That is, the flexible dome cap 32 is connected to the supply lip 50 of the oil supply port 50 of the hollow body 31.
By removing the lubricating oil from the oil supply port 50 into the storage portion 33a by removing the lubricating oil from the oil supply port 50, the worker puts a finger on the top of the flexible dome cap 32, and When pressed while closing the 32a, the flexible dome cap 32 flexes and is reduced and deformed to increase the air pressure in the flexible dome cap 32, thereby opening the tongue-shaped valve body 51b of the check valve 51 and applying pressure. The compressed air is supplied to the storage unit 33a, and the storage unit 33a
Increase air pressure inside. When the operator loosens the pressing force of the finger and releases the ventilation hole 32a from the finger, outside air enters the flexible dome cap 32 through the ventilation hole 32a, and returns to a state before pressurization. The check valve 50 is closed, and one operation is completed, and the function as a pressurizer is achieved. By repeating the above operation, the air pressure in the upper space of the lubricating oil in the storage section 33a can be gradually increased.

Next, the operation and operation of the clipper-type brush cutter according to the embodiment of the present invention will be described. The motor 11 is driven, and the upper and lower cutting blades 14, 1 are driven via a driving mechanism (not shown) such as a reduction gear and an eccentric cam.
5 is reciprocated in opposite phases in the front-rear direction, and while holding the body by holding the rear handle 22 with the left hand,
The prime mover 11 is controlled by the throttle trigger 22a, and the cutting blade 14,
15 while controlling the operation of the cutting blades 14, 1
The cutting is performed by cutting plants and the like by 5.

The position of the valve element 42 of the on-off valve 41 in FIGS. 2, 6 and 7 is determined by the state in which the valve is opened and lubricating oil is supplied to the cutting blades 14 and 15 via the on-off valve 41. As shown, when the oil supply device M is not operated, the valve body 42 is rotated by 90 ° from the position shown in the drawing to place the on-off valve 41 in a closed state. When the operator puts a finger on the top of the flexible dome cap 32 in the non-operation state of the oil supply device M, presses while closing the ventilation hole 32a, and repeats a series of operations of releasing the pressing. Due to the air compression function, the internal pressure of the storage section 33a gradually increases. When the open / close valve 41 is rotated to a state shown in FIGS. 2, 6, and 7 in a state where the internal pressure of the storage section 33a is appropriately increased, the lubricating oil in the storage section 33a is stored in the storage section 33a. The lubricating oil outlet pipe 48 of the storage part 33a, the inlet side flexible pipe 46, and the through hole 4 of the on-off valve 41
5, the lubricating oil flow path 20 which is elongated in the lateral direction of the cutting blade support plate 20 constituting the oil supply unit S, via the outlet side flexible pipe 47 and the oil injection nipple 17.
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. The lubricating oil that has flowed out onto the upper surface of the cutting blades 14 gradually seeps onto the sliding surfaces of the cutting blades 14 and 15 as the upper and lower cutting blades 14 and 15 slide forward and backward. Lubricate the sliding surface.

As described above, in one embodiment of the present invention, the storage portion 33a of the protector 30 is provided 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, 15
When it is desired to supply the lubricating oil to the lubricating oil, the lubricating oil can be reliably supplied only by rotating the open / close valve 41 while the lubricating oil in the storage portion 33a is in a pressurized state.

Although the embodiment of the present invention has been described in detail, the present invention is not limited to the above embodiment.
Various changes can be made without departing from the invention as set forth 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 this embodiment, the same components and members as those in the above-described embodiment are denoted by the same reference numerals, and duplicate descriptions will be omitted.

In the present embodiment, the flexible dome cap 32 is configured so as not to have a check valve and not to be provided with the ventilation hole 32a. Other configurations are the same as those of the above-described embodiment. The hollow portion inside the hollow main body 31 of the protector 30 has left and right side hollow portions communicating with each other at upper and lower portions, and both sides of the hollow portion inside the hollow main body 31 are used for storing lubricating oil. It is configured as a unit.

A feature of this embodiment is that a check valve 52 is disposed in place of the on-off valve 41 of the oil supply device M in the above-described embodiment. As shown in FIG. 11, an inlet pipe 53 and an outlet pipe 54 are integrally disposed at both ends of the check valve 52. A cylindrical cavity 55 is provided in the center 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 space 55, and the spherical body 56 is formed by a coil spring 57 and an adjusting screw body 58 in the pipe through hole 53 of the inlet pipe 53.
It is urged 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 this embodiment, as shown in FIG. 12, a duckbill check valve 61 for inflow of outside air is provided above the storage portion 33a. Next, the operation and operation of the thus-configured oil supply device M of the present embodiment will be described. The state where the sphere 56 of the check valve 52 is located at the position shown in FIGS. 10 and 11 indicates that the refueling device M is in an inactive 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 bends and deforms to reduce its internal volume. . Due to its volume decrease,
The internal pressure of the storage portion 33a communicating with the inside of the flexible dome cap 32 increases. Due to the increase of the internal pressure, the lubricating oil in the storage portion 33a is pressurized, and this pressure is applied to the check valve 52 via the lubricating oil outlet pipe 48 and the inlet side flexible pipe 46 of the storage portion 33a. The lubricating oil is guided to the through hole 53a of the inlet pipe 53. Due to the increase of the lubricating oil pressure in the through hole 53a, the sphere 56 is
Away from the valve seat 53b of the through hole 53a against the pressing force of the above, the lubricating oil in the through hole 53a flows into the cylindrical cavity 55, and further, the outlet side flexible tube 47, and The oil is supplied to the lubricating oil flow path 20a which is elongated in the lateral direction of the cutting blade support plate 20 constituting the oil supply section S via the oil injection nipple 17.

Then, 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 outside air inflow duckbill check valve 61, and the negative pressure state in the storage section 33a is eliminated. In this embodiment, each time an operator puts a finger on the top of the flexible dome cap 32 and presses it, the storage unit 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.

Although the on-off valve is not provided in this embodiment, the check valve 52 and the on-off valve can be provided in series, and a vent hole is provided at the top of the flexible dome cap 32. It is of course possible to provide a check valve in the flexible dome cap 32. Further, in the present invention, as shown in FIG. 13, in configuring the oil supply section S, an oil pipe 59 is used instead of the outlet side flexible pipe 47, and the oil pipe 59 is connected to 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,.

Further, in one embodiment of the present invention,
The reservoir 33 a for lubricating oil is provided in the hollow body 31.
However, it is needless to say that it can be configured to be provided on both sides. It is needless to say that a disinfectant solution can be put in the storage section 33a in place of the lubricating oil, and the cut end can be disinfected simultaneously with the mowing operation.

[0031]

As will be understood from the above description, according to the present invention, since the storage portion for the lubricating oil is formed using the internal space of the protector, the tank as the storage portion for the lubricating oil is formed. There is no need to provide separately, and the lubricating oil in the reservoir is pressurized by a member that also functions as a lid that closes the oil supply port of the reservoir. There is no need to prepare the unit, and the structure is simplified. Further, since a pump having a different structure is not required, the capacity of the storage section in the protector can be increased, and the weight of the protector can be reduced.

[Brief description of 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.

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

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

FIG. 4 shows the protector 3 viewed from the direction of arrow IV in FIG.
0 is a plan view.

FIG. 5 is a view showing the protector 3 viewed from a direction indicated by an arrow V in FIG.
0 is a bottom view.

6 is a sectional view taken along the line VI-VI in FIG. 3;

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

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 2;

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

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

FIG. 11 is an enlarged sectional view of a check valve 52;

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

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

[Explanation of symbols]

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

Claims (7)

(57) [Claims] 1. A clipper-type brush cutter comprising a lubricating device M for supplying lubricating oil to sliding surfaces of the cutting blades 14 and 15 and a protector 30 having a front handle 35 on a side wall portion. A hollow dome 31 which is formed in a hollow shape and serves as a storage portion 33 a for storing lubricating oil, and a protector support 34, and a flexible dome cap 32 is provided at an oil supply port 50 of the hollow main body 31. Characterized hair 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 from the storage section 33a to the oil supply section S via 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 on-off valves or check valves. 5. The flexible dome cap 32 has a ventilation hole 32a formed therein.
The clipper-type brush cutter according to claim 1, wherein a check valve 51 is disposed in the inside. 6. The clipper-type brush cutter according to claim 1, wherein a check valve 61 for outside air inflow is disposed above the storage portion 33a. 7. The hollow portion of the hollow main body 31 of the protector 30 is divided into two parts at the center, left and right, one or both of which are used as the lubricating oil storage part 33a and the valve 4 is provided.
The clipper-type brush cutter according to any one of claims 1 to 6, wherein 1, 52 are arranged at the lower center of the protector 30.