JP5562793B2 - Hedge trimmer - Google Patents

Description

  The present invention relates to a portable pruning machine (hedge trimmer) treatment, arm rest, and the like for pruning tree branches and the like.

  A conventional hedge trimmer equipped with an electric motor or a prime mover engine is provided with a main handle formed at the rear of the hedge trimmer main body and an auxiliary handle located at the front of the hedge trimmer main body. Hold or operate the hedge trimmer by holding the main handle with your hand and the auxiliary handle with your other hand. Furthermore, an elbow rest (hereinafter referred to as an arm rest) for supporting the operator's hand, arm or elbow is provided at the rear of the main handle, and this arm rest is located at a high and low position away from the operator's hand. When pruning a tree branch or the like in a place, it is possible to facilitate the operation with one hand and reduce fatigue of the hands and arms. (For example, see Patent Document 1)

JP 2006-191888 A

  However, in the conventional hedge trimmer disclosed in Patent Document 1, since the shape of the arm rest (elbow rest in Patent Document 1) is not a shape along the roundness of the arm, there is no effect of fixing the arm in the working direction of the hedge trimmer. The operability was degraded. In addition, when storing the arm rest, it is necessary to house the tip of the arm rest in a recess formed in the lower part of the main handle, so the length of the arm rest is limited and sufficient for reducing hand and arm fatigue. There was no effect. Here, the working direction of the hedge trimmer means the horizontal direction of the hedge trimmer, which is the horizontal direction when the upper surface of the hedge or the like is pruned horizontally, and the vertical direction when the side surface of the hedge or the like is selected in the vertical direction. Moreover, when pruning a hedge etc. in the diagonal direction or pruning so that a circular arc may be drawn, it means the advancing direction of the saw blade in each case.

  The present invention has been made to solve the above-described problems, and its purpose is to secure a sufficient length of the arm rest so that the position of the arm fixed by the arm rest is close to the elbow or the upper arm. It is possible to provide a hedge trimmer having an effect of fixing the arm in the working direction of the hedge trimmer.

In order to solve the above problems, the present invention provides a main handle formed at the rear part of a housing, an arm receiver rotatably provided at the rear part of the main handle, and a guard provided in front of the main handle. In the hedge trimmer, the two arm support side portions are connected by a U-shaped arm support connecting portion, and the end portions of the two arm support side portions are integrally formed. The arm handle is pivotally supported at the rear part of the main handle, and the arm receiver is rotated on the main handle to be positioned at the arm receiving position and the storage position, and when the arm receiver is in the arm receiving position. , together with the arm receiving coupling portion is located behind the main handle, receiving the said arms are exhibited longitudinal chevron shape that is refracted substantially in the middle of, when the arm receiving is in the stowed position, the arm receiving The connecting part is located behind the guard in front of the main handle. And butterflies.

  Here, it is preferable that the arm support connecting portion can restrict the operator's arm in the left-right direction at the arm support position.

  The arm receiving position is preferably adjustable.

  According to the hedge trimmer of the present invention, it is easy to operate with one hand and reduce fatigue of hands and arms when pruning work such as a tree branch at a high place or low place away from the operator's hand. It is possible.

It is a figure explaining the use condition of the hedge trimmer which concerns on this invention. It is a front view of the hedge trimmer which concerns on Embodiment 1 of this invention. FIG. 3 is a plan view of FIG. 2. It is a B arrow side view of FIG. It is a figure explaining an arm receiving position. It is AA arrow sectional drawing of FIG. It is a front view of the hedge trimmer which concerns on Embodiment 2 of this invention. FIG. 8 is a plan view of FIG. 7. It is a front view of the hedge trimmer which concerns on Embodiment 3 of this invention. FIG. 10 is a plan view of FIG. 9. It is a front view of the hedge trimmer which concerns on Embodiment 4 of this invention. It is a top view of FIG. It is DD sectional view taken on the line of FIG. It is a principal part enlarged view of FIG.

  FIG. 1 shows a method of using the hedge trimmer 10 of the present invention with one hand. An operator holds the main handle 12, receives an arm or elbow with an arm support 20, and is located at a height away from the operator's hand. Pruning work such as tree branches in low places. In the following description, the right side of FIG. 1 is referred to as the front of the hedge trimmer 10, and the left side is referred to as the rear of the hedge trimmer 10. Moreover, as shown in FIG. 3, the upper direction of FIG. 3 is called the left side of the hedge trimmer 10, and the lower direction is called the right side.

[Embodiment 1]
Embodiment 1 of the present invention will be described with reference to the drawings. 2 and 3, reference numeral 11 denotes a housing of the hedge trimmer 10, and a motor (not shown) serving as a drive source is built in the housing 11 which is assembled by stacking a pair of left and right half housing members, which are usually molded from resin. doing. A pair of upper and lower cutting blades 14 and 14 having blades formed in a comb shape along the longitudinal direction are provided in front of the housing 11, and a main handle 12 formed integrally with the housing 11 is provided in the rear. It has been. An auxiliary handle 13 is fixed to the housing 11 by a support shaft in front of the housing 11. Reference numeral 15 denotes a guard which protects the operator from the cut leaves and leaves. Reference numeral 16 denotes a trigger lever. By operating this with a finger, electricity from the power cord 17 is turned on and off to The motor can be rotated or not rotated.

  Reference numeral 20 denotes an arm support pivotally supported at the rear part of the main handle 12, and the arm receiver 20 has two arm support side parts 20a and 20a connected by a U-shaped arm support connecting part 20b. When it is configured integrally and is at the arm receiving position indicated by the solid line in FIG. 2, it has a chevron shape that is refracted at the approximate center in the longitudinal direction. More specifically, in the front view, the arm receiver 20 is constituted by the arm receiving side portions 20a and 20a on one side from the mountain-shaped apexes 20d and 20d and the arm receiving connecting portion 20b on the other side, as shown in FIG. The shape of the arm receiver connecting portion 20b in a rear view is formed in a round semicircle in the lower part of FIG. 4, and the operator's arm is restricted by the working direction of the hedge trimmer 10 by the semicircular shape. The operability can be improved.

  Reference numeral 30 denotes a fixing means for fixing the arm receiver 20, and as shown in FIGS. 6 and 14, is mainly composed of a lever 31, a shaft 32, a compression coil spring 33, and the like. This is set to the arm receiving position (P, Q, R in FIG. 5) that the operator likes. The holes provided in the end portions 20c and 20e of the arm receiving side portions 20a and 20a of the arm receiver 20 and the vicinity communicating with the holes so that the rear portion of the main handle 12 intersects the rear portion of the housing 11 (hereinafter simply referred to as the main handle 12). A shaft 32 is provided through the hole 12a provided in the rear portion), and the arm receiver 20 is rotatably attached to the rear portion of the main handle 12 by the shaft 32. Serrations are applied to the opposite surfaces S and S of the end portions 20c and 20e of the arm rest 20 and the rear portion of the main handle 12 which are in contact with each other. The end portion 20c is provided with a concave portion 20f facing outward for accommodating the compression coil spring 33, washers 33a and 33a, and the cylindrical member 33b. The compression coil spring 33 is guided on the outer periphery of the cylindrical member 33 b and is interposed between the washers 33 a and 33 a, the shaft 32 passes through the cylindrical member 33 b and the washers 33 a and 33 a, and one washer 33 a is at the base of the lever 31. The other washer 33a is opposed to the arm receiving side portion 20a which is the bottom of the recess 20f. The axial length of the cylindrical member 33 b is set slightly longer than the close contact height of the compression coil spring 33. The cylindrical member 33b may be substituted by a necessary number of washers. The base of the lever 31 and one end of the shaft 32 are rotatably connected by a small pin 36, and the other end of the shaft 32 is provided with a flange, and the movement of the shaft 32 in the C direction is restricted by this flange. . The base of the lever 31 has a cam surface 31a provided parallel to the longitudinal direction of the lever 31 and a cam surface 31ba provided in a direction orthogonal to the longitudinal direction. The distance between the pin 36 and the cam surface 31a is The distance between the cam surfaces 31b is set to be longer than the distance between the cam surfaces 31b. When the lever 31 is in the position of the solid line in FIG. 14, the cam surface 31a contacts the washer 33a. The cam surface 31b comes into contact with 33a. Since it is configured as described above, by appropriately setting the length of the shaft 32, when the lever 31 is in the position of the solid line in FIG. The arm rest 20 is fixed to the rear part of the main handle 12 and cannot be rotated. Further, when the lever 31 is in the position of the two-dot chain line in FIG. 14, the serrations provided on the surfaces S and S are locked only by the spring force of the compression coil spring 33. The arm rest 20 can overcome the serration unevenness and can rotate at the rear portion of the main handle 12 about the shaft 32.

  2 and 3 is an arm receiver 20 in a position (accommodated position) that is stored when one-hand operation is not performed, and the main handle is centered on the shaft 32 from the arm receiving position. 12 is rotated forward and stored in the storage position. At this time, since the arm support connecting portion 20b of the arm receiver 20 is positioned in front of the main handle 12 and behind the guard 15, the length of the arm receiver 20 can be increased. Since the place where 20 and the arm come into contact can be located further away from the main handle 12, it is possible to reduce the load on the arm. Further, the distance between the arm receiving side portions 20a and 20a is formed to be sufficiently larger than the thickness of the main handle 12 in the left-right direction so that the operator does not get in the way when holding the main handle 12.

A pruning operation performed by one-handed operation of the hedge trimmer 10 configured as described above will be described. Now, assuming that the arm rest 20 is in the storage position indicated by the two-dot chain line in FIG. 2, the operator operates the lever 31 with the finger at the position indicated by the two-dot chain line in FIG. Then, since the serrations processed on the opposing surfaces S and S of the end portions 20c and 20e of the arm receiver 20 and the rear portion of the main handle 12 are compressed only by the spring force of the compression coil spring 33, the compression force is strong. Instead, overcoming the unevenness of the serration, the arm rest 20 can be rotated around the shaft 32 at the rear part of the main handle 12. When the lever 31 is operated to the position indicated by the solid line in FIG. 6 after the arm receiver 20 is rotated and brought from the storage position to the arm receiver position, the shaft 32 is pulled by the lever 31 in the direction of arrow C by the lever principle. Since the end portions 20c and 20e of the arm receiver 20 and the rear portion of the main handle 12 are tightly tightened, the arm receiver 20 is fixed to the rear portion of the main handle 12 by serration and fixed to the arm receiving position. After setting the arm receiver 20 as described above, the operator grasps the main handle 12 by hand, receives the arm or elbow with the arm receiver 20, operates the trigger lever 16, turns on the motor, and starts the pruning operation. Since the arm rest 20 has a shape along the roundness of the arm, when the hedge trimmer 10 is moved in the working direction with one hand and the pruning work is performed, the arm is fixed to the arm rest 20 in the working direction of the hedge trimmer 10 and the pruning work is performed. Increases efficiency. Further, when the saw blade 14 is set vertically and the vertical surface of the hedge is pruned, the arm is fixed to the arm receiver 20 in the working direction, and the efficiency is improved. Furthermore, since the portion where the arm receiver 20 and the arm contact is away from the main handle 12, the load on the arm is reduced and the fatigue of the operator is reduced. When returning the arm receiver 20 to the storage position, the operator operates the lever 31 as shown by a two-dot chain line in FIG. 6 to release the fixing of the arm receiver 20 and the main handle 12, with the shaft 32 as the center. Then, the arm receiver 20 is rotated to the top of the housing 11 to move the arm receiver 20 to the storage position and fixed by the lever 31.

[Embodiment 2]
Embodiment 2 of the present invention will be described with reference to the drawings. Since the second embodiment is a modification of the fixing means of the arm receiver 20 in the first embodiment, the changed portion will be described in detail, and the same or substantially the same configuration as the first embodiment is considered. Parts are denoted by the same reference numerals, and redundant description is omitted.

  7 and 8, reference numeral 40 denotes a fixing means for fixing the arm rest 20 at the arm receiving position, which is mainly composed of a cam 41 and a shaft 42. This is set to P, Q, R) in FIG. A hole (not shown) through which the shaft 42 passes is provided at the rear end of the housing 11, and the hole is located behind the hedge trimmer 10 from the hole 12 a. The cam 41 has a polygonal shape when viewed from the front in FIG. 7, each surface of the polygon forms a cam surface, and is provided with a screw hole eccentric from the center of the polygon, as shown in FIG. Cams 41 and 41 are screwed to both sides of the shaft 42 penetrating the hole, and the arm receiving side portions 20a and 20a of the arm receiver 20 are positioned right above the cam surface of the cam 41. Then, by bringing the arm receiving side portions 20a and 20a into contact with the cam surface of the cam 41, the rotation of the arm receiving 20 in the counterclockwise direction in FIG. 7 is restricted and fixed to the arm receiving position. At this time, the cam surface of the cam 41 may be a regular polygon, but the cam surface may be a different polygon, and the latter can greatly change the adjustment angle of the arm receiving position. .

[Embodiment 3]
Embodiment 3 of the present invention will be described with reference to the drawings. Since the third embodiment is a modification of the first embodiment, the modified part will be described in detail, and the same reference numerals are given to the parts considered to be the same as or substantially the same as those of the first embodiment. A duplicate description will be omitted.

  As shown in FIGS. 9 and 10, the arm receiver 50 also serves as an auxiliary handle when in the storage position. Therefore, the hedge trimmer 10 of the third embodiment does not require the auxiliary handle 13. Like the arm receiver 20, the arm receiver 50 is formed in a U shape in a front view and a U shape in a plan view, and corresponds to the arm receiving side portions 50 a and 50 a having a U shape and a bottom portion of the U shape. The arm receiver connecting part 50b is formed integrally. The arm receiver 50 is also similar to the arm receiver 20 in that it is formed in a semicircular shape so as to follow the roundness of the arm as viewed in the direction of arrow E in FIG. However, since the arm receiver 50 has the function of the auxiliary handle 13, the length of the arm receiver side portions 50a and 50a is adjusted so that it can be easily used as an auxiliary handle when it is in the storage position indicated by the two-dot chain line. Has been. However, as in the first embodiment, the arm support connecting portion 50b is positioned behind the guard 15 in front of the main handle 12. Further, the arm receiver 50 is fixed to the storage position and the arm receiving position by the lever 31 as in the first embodiment.

  The operation of the hedge trimmer 10 configured as described above will be described. In a normal pruning operation, the operator grasps the main handle 12 with one hand, grasps the arm support connecting portion 50b of the arm support 50 in the storage position with the other hand, operates the trigger lever 16, and operates the motor. Turn on the power and start pruning. Since the pruning operation performed by one-handed operation is the same as that in the first embodiment, the description thereof is omitted.

[Embodiment 4]
Embodiment 4 of the present invention will be described with reference to the drawings. Since the fourth embodiment is a modification of the arm receiver 20 in the first embodiment, the modified part will be described in detail, and the part considered to be the same or substantially the same configuration as the first embodiment will be described. The description which attaches | subjects the same code | symbol and overlaps is abbreviate | omitted.

  As shown in FIGS. 11 to 13, the arm receiver 60 is formed by covering a cover 61 made of a soft material from the arm receiver side portions 20 a and 20 a of the arm receiver 20 to the arm receiver connecting portion 20 b. The cover 61 is tubular, and the hole of the tube is provided eccentrically with respect to the outer peripheral surface as can be seen in the cross-sectional view of FIG. 13, and can be rotated around the arm rest 20 by a predetermined turning force or more. It is like that. Therefore, as shown in FIG. 13, when the thick portions of the cross section of the cover 61 are directed toward the inner side in the left-right direction of the arm receiver 20, the interval between the arms is narrowed, so that even a person with a thin arm firmly fixes the arm. It becomes possible to do.

  The preferred embodiments of the present invention have been described above, but the technical scope of the present invention is not limited to the scope described in the above embodiments, and various changes or improvements can be added. For example, in the above-described embodiment, the shape of the rear view of the arm support connecting portion 20b is formed in a round semicircle downward, but the arm support connecting portion 20b may restrict the operator's arm in the left-right direction. It is not limited to a semicircular shape as long as it can be formed. For example, it may be V-shaped.

DESCRIPTION OF SYMBOLS 10 Hedge trimmer 11 Housing 12 Main handle 13 Auxiliary handle 14 Saw blade 15 Guard 16 Trigger lever 17 Power cord 20 Arm receiver 20a Arm receiver side part 20b Arm receiver connecting part 20d Apex 30 Fixing means 31 Lever 32 Shaft 33 Compression coil spring 40 Fixing means 41 Cam 50 Arm support 60 Arm support 61 Cover

Claims (3)

In a hedge trimmer , comprising: a main handle formed at the rear of the housing; an arm receiver rotatably provided at the rear of the main handle; and a guard provided in front of the main handle. Two arm support side portions are connected by a U-shaped arm support connecting portion to be integrally formed, and the end portions of the two arm support side portions are pivotally supported on the rear portion of the main handle. The arm rest is rotated on the main handle to be positioned at the arm rest position and the storage position, and when the arm rest is at the arm rest position, the arm rest connecting portion is located behind the main handle. And the arm rest is in a chevron shape refracted at the approximate center in the longitudinal direction. When the arm rest is in the retracted position, the arm rest connecting portion is located in front of the main handle from the guard. A hedge trimmer characterized by being located rearward.   2. The hedge trimmer according to claim 1, wherein the arm support coupling portion is capable of restricting an operator's arm in the left-right direction at the arm support position.   The hedge trimmer according to claim 1 or 2, wherein the arm receiving position is adjustable.

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