JP2004254629A - Handheld mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a handheld mower capable of cutting even thick branches, etc. <P>SOLUTION: An electric trimmer 1 is equipped with a clipper blade 10 having an upper blade 11 and a lower blade 21, a power feeder for feeding a driving power to the clipper blade 10 and relatively reciprocating the upper blade 11 and the lower blade 21 and a handle 51 having a front handle 52 and a rear handle 53 and arranged before and after a cover body part 50 attached to the power feeder. The upper blade 11 and the lower blade 21 are each engaged with eccentric cams 39 and 40 rotated by receiving driving force from an electric motor which is a part of a power transmission mechanism and the upper blade 11 and the lower blade 21 are relatively reciprocated in longitudinal direction according to rotation angle of these eccentric cams 39 and 40. A saw blade 70 arranged on the outside in width direction of the clipper blade 10, extending to the front side along the clipper blade 10 and turning the tip of the blade to the outside is detachably attached to the lower blade 21 and a cover member 80 is detachably attached to the clipper blade 10. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hand-held reaper, and more particularly to a hand-held reaper having a clipper blade in which an upper blade and a lower blade arranged in two upper and lower stages reciprocate relatively.
[0002]
[Prior art]
Such a hand-held reaper includes an engine that generates a driving force, a power transmission mechanism driven by the driving force from the engine, a clipper blade driven via the power transmission mechanism, and a power transmission mechanism. There is one that includes a front handle and a rear handle provided on a front side and a rear side of a transmission case (for example, see Patent Document 1).
[0003]
The clipper blade of this hand-held reaper has an upper blade and a lower blade which extend in the front-rear direction and are arranged vertically, and each of the upper blade and the lower blade has a blade body projecting outward in the width direction. Many are formed with a pitch. The upper blade and the lower blade are configured to make a relative reciprocating motion via a power transmission mechanism, and the blade bodies of the upper blade and the lower blade move toward and away from each other. Therefore, when the clipper blade is driven in a state in which the branches and the like are inserted between the blades adjacent in the front-rear direction of the upper blade and the lower blade, the branches and the like are cut by the blades moving closer to each other.
[0004]
[Patent Document 1]
JP-A-10-313682 (page 4, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, when the object to be cut is a thick branch or the like, when the thick branch is inserted between the blades of the upper blade and the lower blade that reciprocate reciprocally, the upper blade and the lower blade are in a locked state, As a result, there is a disadvantage that the thick branches cannot be cut. Further, if the driven upper blade and lower blade are suddenly locked, there is a problem that the engine and the power transmission mechanism for driving the upper blade and the lower blade may be damaged.
[0006]
The present invention has been made in view of such a problem, and even when an object to be cut is a thick branch or the like, a hand-held reaper that can cut a thick branch or the like without damaging an engine or a power transmission mechanism. The purpose is to provide.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to the present invention provides a clipper blade in which an upper blade and a lower blade can reciprocate relative to each other, and a power for supplying a driving force to the clipper blade to relatively reciprocate the upper blade and the lower blade. A hand-held device having a supply device and a handle directly or indirectly connected to the power supply device, wherein the handle is gripped and the clipper blade is driven by power supply from the power supply device to perform a mowing operation. In the mower (for example, the electric trimmer 1 in the embodiment), the cutting edge is directed to either the upper blade or the lower blade driven by the power supply from the power supply device so that the cutting edge is directed to the outside in the width direction of the clipper blade. Along the saw blade is provided detachably.
[0008]
According to the hand-held reaper of the above configuration, a saw blade is detachably provided on one of the upper blade and the lower blade driven by the power supply device, and the saw blade is along the clipper blade, and the edge of the saw blade has a cutting edge. By turning the clipper blade outward in the width direction, the power of the clipper blade is supplied by bringing the blade edge of the saw blade into contact with a thick cut object that can not be cut with the clipper blade, and the saw blade extends in the direction in which the clipper blade extends. By reciprocating, a thick object can be cut. For this reason, only by connecting the saw blade to one of the upper blade and the lower blade driven by the power supply device, it is possible to cut even a thick cut object, and the target range of the cuttable cut object is reduced. It can be enlarged to provide a more convenient hand-held mower.
[0009]
In the hand-held reaper having the above configuration, a cover member that covers the clipper blade may be detachably attached to the clipper blade while the saw blade is exposed.
[0010]
According to the hand-held reaper having the above-described configuration, by providing the cover member for covering the clipper blade, when cutting the object to be cut by the saw blade, not only the saw blade but also the clipper blade are driven when the power supply device is driven. For this reason, if the cover member is attached to the clipper blade, in the cutting operation for cutting the object to be cut by the saw blade, even if the clipper blade comes into contact with another object near the object to be cut, it is cut. Alternatively, there is no risk of damage, and damage to an object around the object to be cut can be prevented.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. In this embodiment, an electric trimmer which is an example of a hand-held reaper will be described. For convenience of explanation, the directions indicated by arrows in FIG. 1A (front view) and FIG. 1B (bottom view) will be described below as the front-back direction and the left-right direction.
[0012]
As shown in FIGS. 1B and 2, the electric trimmer 1 includes a clipper blade 10 in which an upper blade 11 and a lower blade 21 can reciprocate relative to each other, and supplies a driving force to the clipper blade 10 so that the upper blade 11 1 and a power supply device 30 having an electric motor 31 and a power transmission mechanism 35 for relatively reciprocating the lower blade 21 and a cover main body shown in FIG. It has a handle 51 having a front handle 52 and a rear handle 53 disposed on the front side and the rear side of the portion 50. An operation hole 55 penetrating in the left-right direction is formed on the rear end side of the cover main body 50, and the above-described rear handle 53 is formed above the operation hole 55 so as to extend in the front-rear direction.
[0013]
After starting the electric motor 31, the electric trimmer 1 holds the front handle 52 shown in FIG. 1A with one hand of the operator and the rear handle 53 with the other hand, and The clipper blade 10 is driven while appropriately adjusting the output to perform the cutting operation of the leaves and the like.
[0014]
As shown in FIG. 2 (internal structure diagram), the electric motor 31 constituting a part of the power supply device 30 is disposed in the cover main body 50 with the drive shaft 32 facing downward, and The electric motor 31 is fixedly held in the cover main body 50 in a state where the drive shaft 32 is inserted through a bearing 33 disposed below the 31. The drive of the electric motor 31 is controlled in accordance with the operation of a switch 34 that is rotatably provided up and down at the front lower portion of the rear handle 53. A power transmission gear 37 meshes with a gear portion 32 a of the drive shaft 32 extending downward from the bearing 33.
[0015]
A pair of eccentric cams 39 and 40 composed of two upper and lower stages are rotatably fitted coaxially with the rotation center shaft 36 extending downward from the lower surface of the power transmission gear 37. The pair of eccentric cams 39 and 40 are circular cams, which will be described further with reference to FIG. 1B (bottom view). A fixed pin 41 that vertically inserts the power transmission gear 37 further includes a pair of eccentric cams 39. , 40 are inserted, and a pair of eccentric cams 39, 40 are fixed to the power transmission gear 37. Therefore, the pair of eccentric cams 39 and 40 rotate with the power transmission gear 37. The pair of eccentric cams 39 and 40 are arranged so that their radii in the maximum direction are linear, and are fixed to the power transmission gear 37. The operation of the pair of eccentric cams 39 and 40 will be described later in detail.
[0016]
Below the pair of eccentric cams 39 and 40 shown in FIG. 1 (b), a plate-like substrate 60 extending forward and covering an opening 56 opened on the bottom surface of the cover main body 50 is attached to the cover main body 50 by screws. Have been. The substrate 60 includes a substrate body 60a covering the opening 56 and a substrate tip 60b extending from the front end of the substrate body 60a to the front side. The extending clipper blade 10 described above is provided. The clipper blade 10 includes a lower blade 21 and an upper blade 11 extending in the front-rear direction. The upper blade 11 is mounted on the lower blade 21 along the lower blade 21. The fixing plate 63 shown in FIG. Flanges 63a bent upward are formed at both left and right end portions of the fixing plate 63 to increase the strength of the fixing plate 63. A plurality of through holes (not shown) arranged at predetermined intervals in the front-rear direction are provided in the substrate distal end portion 60b and the fixing plate 63 shown in FIG. 3, and the lower blade 21 and the upper blade 11 have these through holes. Elongated holes (not shown) are formed corresponding to the holes and extend in the front-rear direction while communicating vertically. A bolt 65 is inserted into the vertically communicating hole, and a nut 66 is screwed to a tip end of the bolt 65 protruding upward from the fixing plate 63 as shown in FIG. The upper blade 11 is fastened so as to be relatively reciprocable in the front-rear direction between the substrate 60 and the fixed plate 63.
[0017]
As shown in FIG. 1B, the lower blade 21 includes a lower blade main body 22 extending in the front-rear direction, and a plurality of blade bodies 23 formed on left and right side surfaces of the lower blade main body 22 so as to protrude in the left-right direction. , And an engagement hole 25 formed at the rear end of the lower blade main body 22. The blade body 23 is formed with a predetermined pitch in the front-rear direction from the front end portion to the rear end side of the lower blade main body portion 22, and the blade body 23 has a triangular shape in a plan view, and has respective inclined surfaces on the front side and the rear side. Is formed with a blade surface 23a. The engaging hole 25 is a long hole extending in the left-right direction. When the eccentric cam 40 engages with the long hole and the eccentric cam 40 rotates in the long hole, the lower blade is formed in accordance with the rotation angle of the eccentric cam 40. 21 reciprocates back and forth.
[0018]
On the other hand, since the upper blade 11 has the same configuration as the lower blade 21, the same portions as the lower blade 21 are denoted by the same reference numerals as those of the lower blade 21, and the description thereof is omitted. Only the points different from 21 will be described. The blade body 13 of the upper blade 11 is formed before and after the lower blade 21 when the engagement hole (not shown) of the upper blade 11 is positioned substantially in line with the engagement hole 25 of the lower blade 21. The upper blade main body 12 shown in FIG. 3 is formed on the side surface so that the blade 13 of the upper blade 11 is located between the blades 23. In addition, the blade body of the upper blade 11 is shown by 13, and the blade surface is shown by 13a. When the eccentric cam 39 rotates, the upper blade 11 reciprocates in the opposite direction to the lower blade 21. As a result, when the pair of eccentric cams 39 and 40 rotate, the respective blade bodies 13 and 23 of the upper blade 11 and the lower blade 21 adjacent to the left and right move close to and away from each other in the front-rear direction, and the blade bodies 13 and Branches and the like inserted between 23 are cut by these blades 13 and 23.
[0019]
By the way, the lower blade main body part 22 formed on the lower blade main body part 22 formed on the lower blade main body part 22 of the lower blade 21 protrudes leftward on the lower blade main body part 22 on the rear side of the blade body 23 formed on the most rear end side. A protruding piece 27 is formed. The tip of the protruding piece 27 protrudes outward from the side of the clipper blade 10, and the sawtooth blade 70 extending forward along the clipper blade 10 is provided at the tip of the protruding piece 27 for tightening bolts, nuts, and the like. It is detachably attached by a tool 71. The saw blade 70 includes a saw body portion 72 extending in the front-rear direction and a saw blade portion 73 formed on the side surface of the saw body portion 72 in the front-rear direction. The saw blade 70 has a saw blade portion 73 on the left side. Is attached to the protruding piece 27 in a state of facing. Therefore, when the electric motor 31 shown in FIG. 2 is driven to rotate the pair of eccentric cams 39 and 40 via the power transmission mechanism 35, the lower blade main body 22 of the lower blade 21 reciprocates in the front-rear direction. The saw blade 70 also reciprocates in the front-rear direction. For this reason, when the cutting edge of the saw blade portion 73 of the saw blade 70 is brought into contact with a thick branch that cannot be cut by the clipper blade 10 and the electric motor 31 shown in FIG. 2 is driven, the saw blade portion 73 is By reciprocating in the front-rear direction on the side surface, a thick branch can be easily cut.
[0020]
In addition, the attachment position of the saw blade 70 is not limited to the left side of the lower blade 21, and is detachably attached to the right side of the lower blade 21, the left or right side of the upper blade 11, and the left and right sides of the upper blade 11 or the lower blade 21. You may. When the saw blade 70 is attached to the right side of the lower blade 21, the protruding piece 27 is formed on the right side of the lower blade body 22. When the saw blade 70 is attached to the right or left side of the upper blade 11, the upper blade body portion 12 is formed on the right or left side of the upper blade 12, and when the saw blade 70 is mounted on the left and right sides of the upper blade 11 or the lower blade 21, the protrusions 27 are formed on the left and right sides of the upper blade body 12 or the lower blade body 22. The part 27 is formed.
[0021]
Now, as shown in FIG. 3, the clipper blade 10 is provided with a cover member 80 to which the clipper blade 10 can be detachably attached from the tip side. The cover member 80 has a bottomed container shape with an open top end. The cross section of the cover member 80 is formed in a rectangular shape. Inside the cover member 80, an upper side surface 81 facing the upper blade 11 and a lower blade 21 are provided. Is formed on the lower side surface 82 facing the lower surface. At an intermediate portion in the left-right direction on the upper side surface 81, an engaging convex portion 83 is formed which extends along the direction in which the cover member 80 extends and engages with the flange portion 63a of the fixing plate 63. An engagement recess 84 is formed to engage with the head 65 a of the bolt 65 that sandwiches the blade 11 and the lower blade 21. Therefore, when the cover member 80 is attached to the clipper blade 10, the upper blade 11 and the lower blade 21 of the clipper blade 10 are covered by the cover member 80, and the engaging projections 83 engage with the fixing plate 63 and The head 65 a of the 65 is engaged with the engagement recess 84, and the cover member 80 is fixed to the clipper blade 10. When the cover member 80 is fixed to the clipper blade 10, as shown in FIG. 1B, the inner surface of the cover member 80 comes into non-contact with the blades 13 and 23 of the clipper blade 10, and the cover member 80 The outer surface is in a non-contact state with the saw blade 70, and the saw blade 70 remains exposed to the outside.
[0022]
As a result, when the electric motor 31 shown in FIG. 3 is driven to cut a thick branch or the like by the saw blade 70 in a state where the cover member 80 is attached to the clipper blade 10, when the electric motor 31 is driven, only the saw blade 70 is cut. The clipper blade 10 is also driven, but since the clipper blade 10 is provided with the cover member 80, the clipper blade 10 itself comes into contact with other objects around the thick branch or the like cut by the saw blade 70. And there is no risk of damaging surrounding objects. For this reason, it is possible to prevent damage to peripheral objects such as thick branches to be cut.
[0023]
The engaging projections 83 and the engaging recesses 84 do not need to be formed over the entire length of the cover member 80, and a plurality of the engaging projections 83 are formed at predetermined intervals in the length direction of the cover member 80. When the cover member 80 is attached to the clipper blade 10, a plurality of engagement recesses 84 are formed at predetermined intervals in the length direction of the cover member 80 so as to engage with the corresponding bolts 65. Is also good. Further, characters, figures, symbols, and the like for identifying the upper surface and the lower surface may be attached to these surfaces so that the upper surface and the lower surface of the cover member 80 can be identified. Further, the cover member 80 is not limited to the bottomed container shape, and may be formed in a rectangular tube shape with both ends opened. The cover member 80 may be formed by extruding resin, plastic, aluminum, or the like.
[0024]
Further, in the above-described embodiment, the configuration in which both the upper blade 11 and the lower blade 21 reciprocate has been described. However, one of the upper blade 11 and the lower blade 21 reciprocates, and the other is fixed. It may be done. In this case, the saw blade is connected to the upper blade 11 or the lower blade 21 that reciprocates. Further, the means for driving the hair clipper blade 10 is not limited to the electric motor 31, but may be an engine.
[0025]
【The invention's effect】
As described above, according to the hand-held reaper of the present invention, the saw blade is detachably connected to one of the upper blade and the lower blade driven by the power supply device, and the saw blade extends along the clipper blade. In addition, by setting the blade edge of the saw blade to face outward in the width direction of the clipper blade, a thick workpiece that cannot be cut by the clipper blade can be cut by the saw blade. For this reason, only by connecting the saw blade to one of the upper blade and the lower blade driven by the power supply device, it is possible to cut even a thick cut object, and the target range of the cuttable cut object is reduced. It can be enlarged to provide a more convenient hand-held mower.
[Brief description of the drawings]
FIG. 1 shows an electric trimmer according to an embodiment of the present invention, FIG. 1 (a) is a front view of the electric trimmer, and FIG. 1 (b) is a bottom view of the electric trimmer.
FIG. 2 is an internal structural view of a portion corresponding to the arrow I of FIG. 1B of the electric trimmer.
FIG. 3 shows an internal structure diagram of a portion corresponding to the arrow I ′ of FIG. 1 (b) of the electric trimmer.
[Explanation of symbols]
1 electric trimmer (hand-held reaper)
Reference Signs List 10 Hair clipper blade 11 Upper blade 21 Lower blade 30 Power supply device 51 Handle 70 Saw blade 80 Cover member

Claims (2)

An upper blade and a lower blade capable of relatively reciprocating; a power supply device for supplying a driving force to the clipper blade to relatively reciprocate the upper blade and the lower blade; A hand-held reaper having a handle connected indirectly, wherein the handle is gripped, and the clipper blade is driven by power supply from the power supply device to perform a reaping operation;
A saw blade along the hair clipper blade is provided detachably with a blade edge directed outward in the width direction of the clipper blade, at one of the upper blade and the lower blade driven by power supply from the power supply device. A hand-held reaper. The hand-held mower according to claim 1, wherein a cover member that covers the clipper blade is detachably attached to the clipper blade while the saw blade is exposed.

Images