JP2005295922A - Hedge trimmer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for reversing and using a blade in a hedge trimmer in a hedge trimmer that has a double-edged specification and is equipped with a blade of double-edged drive type. <P>SOLUTION: In the hedge trimmer having a first and a second eccentric members 127 and 129 rotated and driven by an electric motor held in a main body part, a first and a second blades 143 and 145 that are connected to the first and the second eccentric members, respectively, so as to make a reciprocating linear motion mutually in reverse directions based on the eccentric rotations of the first and the second eccentric members and have cutting edges at both sides with a moving line between, two guide plates 151 and 153 that nip and support the first and the second blades from both the sides so as to allow the first and the second blades to move and are detachably fixed through a fixing means 167 to the main body part, the first and the second blades are formed in the same shape and are connected to the first and the second eccentric members in a reversed state around the moving line so as to change the positions of the cutting edges positioned at both side with the moving line between. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hedge trimmer used for horticultural work such as pruning hedges or pruning roadside trees.

  Japanese Utility Model Publication No. 4-48677 (Patent Document 1) discloses a technique related to a hedge trimmer. The hedge trimmer described in the above publication includes an electric motor that is a drive source, a drive mechanism that converts the rotation of the electric motor into a reciprocating motion, and a pair of upper and lower blades having a comb blade-like cutting blade that is reciprocated by the drive mechanism. And the operator operates the power switch to energize and drive the electric motor to move the upper and lower blades back and forth linearly in opposite directions (reverse phase) to perform hedge cutting work, etc. . The above configuration is a double-edged drive type that drives the upper and lower blades, respectively, and can perform the cutting operation at a higher speed than the single-edged drive type.

By the way, as a blade used for a hedge trimmer, there are a single-edged specification having a cutting edge on one side of a moving line and a double-edged specification having cutting edges on both sides of the moving line. In the case of the double-edged specification, it has the convenience that the pruning operation can be performed while using the right and left cutting blades properly. However, in actual trimming work, the operator does not always use the left and right cutting edges evenly, and there is a possibility that the one that is convenient to use will be used intensively. Will be reduced. For this reason, when one of the cutting blades is worn, it is advantageous that the blade can be reversed (turned over) with the moving line interposed therebetween and the other cutting blade can be used.
Japanese Utility Model Publication No. 4-48677

  In view of the circumstances described above, an object of the present invention is to provide a technique that enables reversal use of a blade in a hedge trimmer having a double-blade specification and a double-blade drive type blade.

In order to achieve the above object, the invention described in each claim is configured.
According to invention of Claim 1, a main-body part, the electric motor accommodated in the main-body part, the 1st and 2nd eccentric member rotated by the electric motor, and the 1st and 2nd eccentric member The first and second blades engaged with the first and second eccentric members so as to reciprocate linearly in opposite directions based on the eccentric rotation of the first and second blades, and the first and second blades are allowed to move Thus, a hedge trimmer having two guide plates that sandwich and hold the first and second blades from both sides is configured. The first and second blades are configured to have cutting edges on both sides of the moving line. Further, the two guide plates are configured to be detachably fixed to the main body portion via fixing means. Thus, a hedge trimmer having a double-edged specification and a double-edged drive blade is provided. In the present invention, the “eccentric member” typically corresponds to a disc, and the “fastening means” typically corresponds to a mounting screw.

  In the hedge trimmer according to the present invention, as a characteristic configuration, the first and second blades are formed in the same shape and moved so as to change the positions of the cutting blades located on both sides across the moving line. It is set as the structure engaged with the 1st and 2nd eccentric member in the state reversed around the line. According to the present invention, in a hedge trimmer having a double-blade specification and a double-blade drive type, the position of the cutting blade is changed and used by inverting the first blade and the second blade around the movement line as necessary. be able to. For this reason, the cutting blades on both sides can be used effectively, and the waste prevention of the blade is achieved.

(Invention of Claim 2)
According to a second aspect of the present invention, in the hedge trimmer according to the first aspect, the two guide plates are formed in the same shape as each other, and the first and second blades, The blade assembly is integrated through the joining means in a state in which movement is permitted, and thereby a blade assembly including the first and second blades and the two guide plates is formed. Here, as an aspect of “allowing linear movement of the first and second blades”, typically, the joining means passes through a long hole extending in the direction of the movement line provided in the first and second blades. The mode corresponds to this, and the mode of “joining” suitably includes joining using bolts and nuts, or joining using rivets.

  In the invention described in claim 2, a blade assembly is constituted by the first and second blades and the two guide plates. According to such a configuration, the first and second blades and the two guide plates can be handled as an integrated object, so that the reversing operation for changing the position of the cutting edge of the blade can be easily performed. .

(Invention of Claim 3)
According to the third aspect of the present invention, each of the one end portions of the two guide plates in the hedge trimmer according to the second aspect is an attachment portion having openings through which the first and second eccentric members pass. Each mounting portion is configured to be fastened to the main body portion by co-tightening with a mounting screw together with a cover plate disposed on the outer surface side of one mounting portion so as to cover one opening.
According to the above configuration, in a state where the guide plate is fixed to the main body, the opening of the guide plate is covered with the cover plate, so that the cut piece cut by the trimming operation can be prevented from entering the inside through the opening. In addition, because the cover plate and guide plate mounting part are fastened to the main body part by fastening with mounting screws, the fastening work can be easily performed compared to the structure of fastening them individually. The number of parts is small.

(Invention of Claim 4)
According to a fourth aspect of the present invention, in the hedge trimmer according to the third aspect, the two attachment portions are opposed to each other with a predetermined gap therebetween, and a step is provided to hold the gap between the two attachment portions. A ring is interposed, and the stepped ring has a configuration in which an end portion in the axial direction projects from the outer surface of the mounting portion, and the projecting end portion serves as a positioning pin for the cover plate. The stepped ring interposed between the mounting parts suppresses the deformation of the mounting part due to tightening of the mounting screw when the mounting part is fixed to the main body part with the mounting screw, thereby keeping the mounting part gap constant. Thus, the smooth movement of the first and second blades is ensured. In addition, the step ring is used as a positioning pin for the cover plate and can determine the relative position of the cover plate with respect to the mounting part. Therefore, the number of parts can be reduced and the cover plate can be attached to the mounting part. At the same time, it is possible to simplify the screw tightening operation when fastening with the mounting screw.

(Invention of Claim 5)
According to the fifth aspect of the present invention, in the hedge trimmer according to the third or fourth aspect, a plate-like spacer is interposed between the two attachment portions, and the spacer is located between the attachment portions. And a thin portion that is inserted between the first blade and the second blade and guides the movement of the blade. When the attachment portion is fixed to the main body portion with the attachment screw, the thick portion of the spacer can keep the attachment portion constant by suppressing deformation of the attachment portion due to tightening of the attachment screw. The thin portion of the spacer holds the first and second blades movably, and ensures a stable engagement state of the blades with the first and second eccentric members.

  According to the present invention, in a hedge trimmer having a double-blade specification and a double-blade drive type blade, a technique that enables the blade to be reversed is provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the overall configuration of the hedge trimmer 100 according to the present embodiment will be described with reference to FIGS. 1 is a side sectional view showing the overall configuration of the hedge trimmer 100, FIG. 2 is a bottom view showing the configuration of the bottom side of the hedge trimmer 100, and FIG. 3 shows the configuration of the motion conversion mechanism 120 as a drive mechanism section. It is an expanded sectional view shown. The trimmer main body 101 of the hedge trimmer 100 includes a housing 103, a front handle 105 disposed on the front side (the right side in FIGS. 1 and 2) and the rear side (the left side in FIGS. 1 and 2) across the housing 103. The rear handle 107 disposed at the center is mainly configured.

  In the housing 103, an electric motor 111 and a movement converting mechanism 120 that converts the rotational movement of the electric motor 111 into a linear movement and transmits the linear movement to upper and lower blades 143 and 145 described later are accommodated. The electric motor 111 is disposed such that the rotation axis with the output shaft 113 on the lower side is in the vertical direction (vertical direction), and a pinion 115 is formed at the tip (lower end) of the output shaft 113. .

  The motion conversion mechanism 120 meshes with and engages with the pinion 115 of the output shaft 113, and a driven gear 123 that rotates in a horizontal plane with the support shaft 121 as a rotation center, and two joining pins 125 on the lower surface side of the driven gear 123. The upper and lower eccentric discs 127 and 129 as crank cams attached via the main body are mainly configured. The upper and lower eccentric disks 127 and 129 correspond to the “first and second eccentric members” in the present invention. As shown in FIG. 2, the upper and lower eccentric discs 127 and 129 are set so that their centers P face each other across the rotation center Q of the driven gear 123, that is, have a phase difference of 180 degrees from each other. Yes. The upper and lower eccentric discs 127 and 129 respectively correspond to the oblong holes 143b and 145b (see FIG. 2) formed in the bases 143c and 145c (left side in FIGS. 1 and 2) of the upper and lower blades 143 and 145, respectively. Are slidably engaged. With this configuration, a so-called crank mechanism is configured, and the upper and lower eccentric disks 127 and 129 are rotated so that the upper and lower blades 143 and 145 perform a horizontal linear reciprocating motion in opposite directions (in opposite phases). The

  A blade assembly 141 is configured by a combination of two upper and lower blades 143 and 145 and two upper and lower guide plates 151 and 153, and this blade assembly 141 is formed on the lower surface (bottom surface) of the housing 103. Further, the blade assembly mounting portion 117 is detachably fixed by a mounting screw 167 via a cover plate 165. As shown in FIG. 2, the blade assembly mounting portion 117 is constituted by four mounting seats 119 having screw holes 118, and these mounting seats 119 with screw holes 118 serve as the rotation centers Q of the eccentric disks 127 and 129. It arrange | positions so that (support axis 121) may be surrounded. The upper and lower eccentric discs 127 and 129 are set so as to protrude below the mounting seat 119 (see FIG. 2) of the blade assembly mounting portion 117, as shown in FIG.

  As shown in FIG. 4, the upper and lower blades 143 and 145 have a double-edged specification having comb-shaped cutting blades 147 and 149 on both sides (left and right) across the movement line X (see FIG. 4). The blades 143 and 145 are paired, and the movement line X is reversed with the upper and lower guide plates 151 and 153 around the rotation line (reversing the front and back), so that the positions of the left and right cutting blades 147 and 149 can be changed and used. Is done. Hereinafter, a configuration that enables the blades 143 and 145 to be reversed will be described with reference to FIGS. The upper and lower blades 143 and 145 correspond to the “first and second blades” in the present invention.

  4 is a plan view showing the blade assembly 141, and FIG. 5 is a cross-sectional view of the blade assembly 141 taken along the movement line X of the blades 143 and 145. FIG. 6 is a plan view showing a cover plate 165 used when the blade assembly 141 is mounted on the blade assembly mounting portion 117, and FIG. 7 is a plan view showing the spacer 169. The blade assembly 141 includes two blades 143 and 145 that overlap one above the other, and two guide plates 151 that are disposed on the upper and lower sides to sandwich and hold the blades 143 and 145 from both sides. 1 to 3, one end side (attachment portion) in the longitudinal direction of the guide plates 151 and 153 is fixed to the blade assembly attachment portion 117 by an attachment screw 167 as shown in FIGS. 1 to 3. The mounting screw 167 corresponds to the “fastening means” in the present invention.

  The upper and lower blades 143 and 145 are common products formed in the same shape as each other, and are long plate-like blade body portions 143a and 145a having cutting blades 147 and 149 on both left and right sides with the movement line X therebetween, It consists of bases 143c and 145c having oblong holes 143b and 145b that can engage with the eccentric disks 127 and 129, respectively. The base portions 143c and 145c are set to have a predetermined step on the back side (opposite the overlapping surface) of the cutting blades 147 and 149 of the blade body portions 143a and 145a. The upper and lower blades 143 and 145 are overlapped so that the blade main body portions 143a and 145a are in sliding contact with the ventral sides of the cutting blades 147 and 149. Therefore, a gap twice as large as the step is formed between the upper and lower bases 143c and 145c. The gap is dimensioned so that the engagement between the bases 143c and 145c and the eccentric disks 127 and 129 is performed at the center in the thickness direction of the blade assembly 141 when the blade assembly 141 is fixed to the blade assembly mounting portion 117. Is set.

  The upper and lower guide plates 151 and 153 are common products formed in the same shape, and guide portions 151a and 153a overlapping the blade main body portions 143a and 145a of the blades 143 and 145, and base portions 143c of the blades 143 and 145, It is comprised from the attaching parts 151b and 153b which overlap with 145c. The mounting portions 151b and 153b are set to have a step having the same size (height) as the step between the blade body portions 143a and 145a and the base portions 143c and 145c of the blades 143 and 145 on the outside of the guide portions 151a and 153a. Is done. The upper and lower guide plates 151, 153 are overlapped on the outer surfaces (upper and lower surfaces) of the upper and lower blades 143, 145, and a plurality of guide portions 151 a, 153 a in the movement line direction of the blades 143, 145 are arranged on the blades 143, 145. It is joined by the joining means so as to allow movement of.

  The joining means includes a sleeve 155 interposed between the upper and lower guide plates 151, 153, a screw (bolt) 157 passing through the guide plates 151, 153 and the sleeve 155, and a nut 159 fastened to the screw 157. The sleeve 155 is slidably penetrated through long holes 143d and 145d formed in the blade body portions 143a and 145a and extending in the movement line X direction. As a result, the upper and lower guide plates 151 and 153 are joined to each other in a form that allows movement of the blades 143 and 145.

  The attachment portions 151b and 153b of the upper and lower guide plates 151 and 153 are formed in a substantially rectangular shape in a plan view having a planar area covering the base portions 143c and 145c of the blades 143 and 145, and the eccentric disks 127 and 129 are formed. Has openings 151c and 153c that can be penetrated. As a result, when the mounting portions 151b and 153b are abutted against the mounting seat 119 of the blade assembly mounting portion 117 of the housing 103, the eccentric disks 127 and 129 pass through the upper opening 151c and the lengths of the base portions 143c and 145c of the blades 143 and 145, respectively. It is configured to be engaged with the circular holes 143b and 145b.

  The upper and lower mounting portions 151b and 153b hold two stepped rings 161 on one side (the side connected to the guide portions 151a and 153a) across the openings 151c and 153c, and two on the other side. A mounting hole 163 is provided, and the stepped ring 161 and the mounting hole 163 are set at positions corresponding to the screw holes 118 of the mounting seats 119 in the blade assembly mounting portion 117 described above. The stepped ring 161 has a through-hole through which the mounting screw 167 can be inserted, and both upper and lower ends protrude from the outer surfaces (upper surface and lower surface) of the upper and lower mounting portions 151b and 153b by the thickness of the cover plate 165. .

  As shown in FIG. 6, the cover plate 165 is formed in a rectangular shape substantially the same as the outer shape of the mounting portions 151 b and 153 b of the guide plates 151 and 153, and the protruding portion of the stepped ring 161 can be fitted on one side. A circular hole 165a, two mounting holes 165b through which the mounting screws 167 can be inserted, and a circular hole 165c for supporting the end (lower end) of the support shaft 121 at the center. . When the mounting portions 151b and 153b of the guide plates 151 and 153 are fixed to the mounting seat 119 of the blade assembly mounting portion 117 by the mounting screws 167, the cover plate 165 is covered with the lower mounting portion 153b of the guide plates 151 and 153. And fastened together with the mounting seat 119. At this time, the two circular holes 165 a provided in the cover plate 165 are positioned by being fitted to the protruding portions of the stepped ring 161.

  Further, when the mounting portions 151b and 153b of the guide plates 151 and 153 are fixed by the mounting screws 167, a spacer 169 is interposed on the mounting hole 163 side between the upper and lower mounting portions 151b and 153b. As shown in FIG. 7, the spacer 169 includes a thick portion 169 a positioned at the upper and lower mounting portions 151 b and 153 b and a thin portion 169 b inserted between the base portions 143 c and 145 c of the upper and lower blades 143 and 145. The plate | board thickness of the thick part 169a is set equal to the clearance dimension of the attaching parts 151b and 153b, and the deformation | transformation at the time of the fastening with the attachment screw 167 is prevented by this. On the other hand, the thin portion 169b inserted between the base portions 143c and 145c holds the base portions 143c and 145c so as to move in a stable state.

  The hedge trimmer 100 according to the present embodiment has a double-edged specification in which the upper and lower blades 143 and 145 have the cutting blades 147 and 149 on both sides of the movement line X as described above, and the upper and lower blades 143 and 145 It is a double-edged drive type that is driven respectively. As shown in FIG. 1, the rear handle 107 is provided with a trigger 109 for operating a power switch (not shown) for starting or stopping the electric motor 111, and the power switch is turned on by the pulling operation of the trigger 109. Thus, the electric motor 111 is energized and driven. By driving the electric motor 111, the upper and lower eccentric disks 127 and 129 are rotated in the horizontal plane together with the driven gear 123, and the upper and lower blades 143 and 145 perform horizontal linear reciprocating motions in opposite directions (in opposite phases). The cutting blades 147 of the upper blade 143 and the cutting blades 149 of the lower blade 145 can be cut by sandwiching branches and leaves as an object to be cut.

  In the hedge trimmer 100 according to the present embodiment, the upper and lower blades 143 and 145 are formed in the same shape, and the upper and lower guide plates 151 and 153 are formed in the same shape, so that the blade assembly 141 can be reversed. It is possible. Therefore, for example, when the sharpness of one of the cutting edges 147, 149 is reduced due to the intensive use of one of the cutting edges 147, 149 across the movement line X, Removes the mounting screw 167 and temporarily removes the cover plate 165 and the blade assembly 141 from the blade assembly mounting portion 117 of the housing 103. Next, the blade assembly 141 is turned upside down around the movement line X of the blades 143 and 145 and moved toward the blade assembly mounting portion 117 in this state, and the upper and lower eccentric disks 127 and 129 are turned upside down. The guide plate 153 is passed through the opening and is engaged with the oblong holes 143b and 145b of the upper and lower blades 143 and 145. Thereafter, the cover plate 165 is placed on the attachment portion 151 b of the lower guide plate 151 after the reversal, and the cover plate 165 is fastened together with the attachment screws 167.

  Thus, the positions of the left and right cutting edges 147 and 149 of the blades 143 and 145 can be changed. That is, according to the present embodiment, the positions of the cutting blades 147 and 149 on the left and right sides with the movement line X interposed therebetween can be used. Thereby, the cutting edges 147 and 149 on both sides can be used effectively, and the waste prevention of the blades 143 and 145 is achieved. Since the operator can use both the cutting edges 147 and 149 of the blades 143 and 145 in an easy-to-use direction corresponding to the dominant hand, the working efficiency is improved. Further, since the upper and lower blades 143 and 145 are common products having the same shape, and the upper and lower guide plates 151 and 153 are also common products having the same shape, one molding die (press molding) is required. This is effective in reducing manufacturing costs.

  In the present embodiment, since the blade assembly 141 is constituted by the upper and lower blades 143 and 145 and the upper and lower guide plates 151 and 153 and can be handled as an integrated object, the cutting blades 147 of the blades 143 and 145 are provided. , 149 can be easily reversed. Further, in this embodiment, by covering the opening 153c of the lower guide plate 153 with the cover plate 165, it is possible to prevent the cut piece cut by the cutting operation from entering the inside through the opening 153c. Further, since the cover plate 165 and the mounting portions 151b and 153b of the guide plates 151 and 153 are fastened to the blade assembly mounting portion 117 by fastening together with the mounting screws 167, compared to a configuration in which they are individually fastened. The fastening operation can be easily performed and the number of parts can be reduced.

  Furthermore, in this embodiment, the stepped ring 161 and the spacer 169 are interposed between the mounting portions 151b and 153b of the upper and lower guide plates 151 and 153, so that the mounting portions 151b and 153b are attached to the blade assembly by the mounting screws 167. When fastened to the portion 117, deformation of the attachment portions 151b and 153b due to tightening of the attachment screw 167 is suppressed, thereby keeping the interval between the attachment portions 151b and 153b constant and smoothing the upper and lower blades 143 and 145 Ensure movement.

  Further, in the present embodiment, the stepped ring 161 is used as a positioning pin for the cover plate 165, so that the number of parts can be reduced and the screw tightening work when fixing the cover plate 165 is simplified. Can be planned. The spacer 169 is configured such that the thin portion 169b is inserted between the base portions 143c and 145c of the upper and lower blades 143 and 145 and functions as a slide guide portion that guides the movement of the base portions 143c and 145c. It is held in a stable state, and as a result, smooth movement of the upper and lower blades 143 and 145 is ensured.

  In this embodiment, the blade assembly 141 in which the blades 143 and 145 and the guide plates 151 and 153 are integrated has been described. However, the guide plates 151 and 153 are used without being inverted, and the blades 143 and 143 are used. It may be configured such that only 145 can be inverted. Further, it is possible to use a fixing means other than the attaching screw 167.

It is a sectional side view showing the whole hedge trimmer composition concerning this embodiment. It is a bottom view of a hedge trimmer similarly. It is sectional drawing which shows the structure of the drive part of a hedge trimmer. It is a top view which shows a blade assembly. 3 is a cross-sectional view showing the blade assembly cut along a movement line X. FIG. It is a top view which shows a cover plate. It is a top view which shows a spacer.

Explanation of symbols

100 Hedge trimmer 101 Trimmer main body 103 Housing 105 Front handle 107 Rear handle 109 Trigger 111 Electric motor 113 Output shaft 115 Pinion 117 Blade assembly mounting portion 118 Screw hole 119 Mounting seat 120 Motion conversion mechanism 121 Support shaft 123 Drive gear 125 Join pin 127, 129 Upper and lower eccentric discs 141 Blade assembly 143, 145 Upper and lower blades 143a, 145a Blade body portions 143b, 145b Oval holes 143c, 145c Base portions 143d, 145d Long holes 147, 149 Cutting blades 151, 153 Upper and lower guide plates 151a, 153a Guide portion 151b, 153b Mounting portion 151c, 153c Opening 155 Sleeve 157 Screw 159 Nut 161 Stepped ring 163 Mounting hole 165 Cover Plate 165a Circular hole 165b Mounting hole 165c Central circular hole 167 Mounting screw 169 Spacer 169a Thick part 169b Thin part P Center of eccentric disk Q Center of rotation of eccentric disk X Blade movement line

Claims (5)

The main body,
An electric motor housed in the main body,
First and second eccentric members that are rotationally driven by the electric motor;
The first and second eccentric members are respectively engaged with the first and second eccentric members so as to reciprocate linearly in opposite directions based on the eccentric rotation of the first and second eccentric members, and the cutting blades are formed on both sides across the moving line. First and second blades having:
The first and second blades are clamped and held from both sides so as to allow movement of the first and second blades, and are detachably fixed to the main body portion via fixing means. A hedge trimmer having two guide plates,
The first and second blades are formed in the same shape, and the first and second blades are reversed around the movement line in order to change the positions of the cutting blades located on both sides of the movement line. A hedge trimmer characterized by being configured to be engaged with a second eccentric member. The hedge trimmer according to claim 1,
The two guide plates are formed in the same shape as each other, and are integrated with the first and second blades through the joining means while allowing the movement of the blades. A hedge trimmer comprising a blade assembly comprising a second blade and two guide plates. The hedge trimmer according to claim 2,
One end portion of each of the two guide plates is an attachment portion having an opening through which the first and second eccentric members penetrate, and each attachment portion has one attachment portion so as to cover one opening. A hedge trimmer characterized in that it is configured to be fixed to the main body portion together with a cover plate arranged on the outer surface side by fastening with a mounting screw. The hedge trimmer according to claim 3, wherein
The both mounting portions are opposed to each other with a predetermined gap, and a stepped ring for holding the gap is interposed between the both mounting portions, and the stepped ring has an axial end at the mounting portion. The hedge trimmer is characterized in that it protrudes from the outer surface of the cover plate, and the protruding end portion serves as a positioning pin for the cover plate. The hedge trimmer according to claim 3 or 4,
A plate-like spacer is interposed between the both attachment portions, and the spacer is located between the attachment portions and joined by the attachment screw, the first blade, and the second blade. And a thin wall portion that is inserted between the blades and guides the movement of the blades.

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