JP4946929B2 - Trimming machine - Google Patents

Description

  The present invention relates to a trimming machine for pruning trees, shaping hedges, trimming grass, and the like.

  In such a trimming machine, an upper blade and a lower blade, each having a plurality of cutting edges formed along both edges in the width direction, are stacked one above the other, and the rotation of the motor is caused to reciprocate linearly between the upper blade and the lower blade by a crank cam. In some cases, the upper blade and the lower blade are alternately reciprocated in opposite directions to perform a necessary trimming operation (see, for example, Patent Documents 1 and 2).

  Here, the attachment structure to the housing bottom face of the bottom cover in the conventional trimming machine is demonstrated based on FIGS.

  9 is a cutaway front view of a conventional trimming machine housing, FIG. 10 is a cross-sectional view taken along the line CC of FIG. 9, FIG. 11 is a cutaway front view of the housing showing how to insert a nut into the bottom of the housing, and FIG. It is a partial bottom view of a housing.

  As shown in FIG. 9, the housing 102 of the conventional trimming machine 101 has a left and right divided structure, and a bottom cover 112 is detachably attached to the bottom surface of each of the four nuts 113 and screws 114 that are screwed to the bottom cover 112. It is attached.

  By the way, as shown in FIG. 12, two U-shaped grooves 116 are formed on the left and right sides of the bottom portion of the housing 102 so as to be spaced apart in the longitudinal direction. Groove-shaped nut chambers 117 are respectively formed. The nut 113 is inserted and held in each nut chamber 117 of the housing 102 from the direction of the arrows in FIGS.

When the nut 113 is inserted and held in the nut chamber 117 of the housing 102 as described above, the bottom cover 112 is put on the bottom surface of the housing 102 and formed at the four corners of the bottom cover 112 as shown in FIGS. Further, the bottom cover 112 can be attached to the bottom surface of the housing 102 by screwing screws 114 inserted into the respective concave portions 112a from below into the respective nuts 113.
JP 2002-305967 A JP 2003-134935 A

  By the way, in the trimming machine 101, the bottom cover 112 is removed from the housing 102 during maintenance such as blade replacement, and when the maintenance is completed, the bottom cover 112 is reattached to the housing 102, but when the screw 114 is loosened and removed, the housing 102 Since the nut 113 held by the nut is not pressed, the nut 113 is dropped from the nut chamber 117, and the nut 113 is lost or the assembling property of the bottom cover 112 is deteriorated.

  The present invention has been made in view of the above-described problems, and a purpose of the present invention is to provide a trimming machine that can prevent the occurrence of problems such as loss of nuts while preventing the nuts from dropping and improving assemblability. There is to do.

  In order to achieve the above object, according to the first aspect of the present invention, in a trimming machine in which a nut is attached to a housing and disassembled and assembled by a screw screwed to the nut, a nut formed with a holding portion for holding the nut is formed. A holder is provided, and the nut holder is inserted and held in the housing while the nut is held in the holding portion of the nut holder.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, a plurality of the holding portions are formed in the nut holder.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the nut holder is made of an elastically deformable material.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a portion other than the holding portion of the nut holder is inserted and held in the housing.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein a separate member is brought into contact with the nut holder inserted and held in the housing to fix the nut holder to the housing. And

  A sixth aspect of the invention is characterized in that, in the invention of any one of the first to fifth aspects, the housing has a left and right divided structure.

  According to the first aspect of the present invention, since the nut remains held by the nut holder even when the screw is removed, the nut does not fall out of the housing, the assembling ability of the trimming machine is improved, and the nut is lost. It is possible to prevent the occurrence of problems such as failure.

  According to the second aspect of the present invention, since a plurality of holding portions are formed on the nut holder and the plurality of nuts are held by the nut holder, the trouble of inserting the plurality of nuts into the housing can be saved. Assembling property is further improved.

  According to the third aspect of the present invention, since the nut holder is made of an elastically deformable material, the width of the holding portion of the nut holder is made smaller than the width of the nut, and the nut is held while the holding portion is elastically deformed. The nut can be preloaded by being fitted into the nut, and the nut can be firmly held by the nut holder to prevent the nut from falling off.

  According to the invention described in claim 4, since the portion other than the holding portion of the nut holder is inserted and held in the housing, the effect of the screw tightening force does not reach the nut holder, and the nut holder is securely held in the housing. Thus, the nut holder and the nut held by the nut holder are reliably prevented from falling off the housing.

  According to the fifth aspect of the present invention, since the nut holder is fixed to the housing by bringing another member into contact with the nut holder inserted and held in the housing, the nut holder is securely held in the housing, and the nut The holder and the nut held by the holder are prevented from falling off from the housing.

  According to the sixth aspect of the present invention, the assembling property of the trimming machine can be improved by making the housing a left and right divided structure.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a cutaway side view of a trimming machine according to the present invention, FIG. 2 is a broken bottom view of a housing portion of the trimming machine, FIG. 3 is a broken front view of the housing portion of the trimming machine, and FIG. FIG. 5 is a sectional view taken along line B-B in FIG. 4, FIG. 6 is a partial perspective view showing a procedure for assembling the nut holder holding the nut into the housing, and FIG. 7 is a nut, nut holder and crankcase. The bottom view which shows the assembly direction to the housing of FIG. 8, FIG. 8 is the same fracture front view.

  A trimming machine 1 shown in FIG. 1 includes a blade unit 3 extending horizontally from a housing 2, and a rechargeable battery 4 is detachably attached to an end of the housing 2. A trigger switch 5 is provided on the handle portion 2 a of the housing 2.

  The blade unit 3 includes an upper blade 6 and a lower blade 7 each having a plurality of comb-shaped cutting blades formed at both ends in the width direction, and the upper blade 6 and the lower blade 7 are horizontally extended. Between the holder plate 8 and the blade holder 9 so as to be reciprocally movable.

  The housing 2 incorporates a motor (not shown) as a drive source, a crank cam 10 that is rotationally driven by the motor, and the like. The crank cam 10 is housed in a crankcase 11. Here, although not shown in the drawing, the crank cam 10 is integrally formed with two upper and lower disk-shaped eccentric cams that are eccentric with respect to the rotation center, with a phase difference of 180 ° from each other. The base end portion of the upper blade 6 is engaged with the long hole, and the base end portion of the lower blade 7 is engaged with the long hole in the lower eccentric cam.

  By the way, as shown in FIG. 3, the resin housing 2 is constructed by joining and integrating divided pieces 2A and 2B which are divided into left and right parts, and a rectangular plate-shaped bottom cover 12 is provided on the bottom surface thereof. It is attached by four nuts 13 and screws 14 screwed into the nuts 13.

  Here, as shown in FIG. 6, flanges 15 extending in the front-rear direction are formed at both left and right ends of the housing 2, and U-shaped grooves 16 are formed at the front and rear ends of each flange 15. A rectangular groove-shaped nut chamber 17 is formed on the back side (upper side) of each groove 16. Each flange 15 is reinforced by a plurality of vertical ribs 18 provided at appropriate intervals in the front-rear direction, and each vertical rib 18 is formed with a horizontal slit-like fitting groove 18a.

  By the way, in the present embodiment, the front and rear two nuts 13 provided on the left and right of the bottom portion of the housing 2 are held by the nut holder 19, and the nut holder 19 holding the two nuts 13 is inserted and held in the housing 2.

  The nut holder 19 is integrally formed of an elastically deformable material such as resin, and holding portions 19a having a U-shape in plan view are formed at both ends in the longitudinal direction. It is mutually connected by the linear connection part 19b. Here, the opening width dimension of each holding portion 19 a of the nut holder 19 is set slightly smaller than the width dimension of the square nut 13.

  Thus, as shown in FIG. 6, the nut 13 is inserted and held in the direction of the arrow in the two holding portions 19 a of the pair of left and right nut holders 19. Here, as described above, since the opening width dimension of each holding portion 19a of the nut holder 19 is set slightly smaller than the width dimension of the square nut 13, the nut 13 is held while elastically deforming the holding portion 19a. By fitting into the portion 19a, a preload can be applied to the nut 13, whereby the nut 13 is firmly held by the holding portion 19a of the nut holder 19, and the drop-off is reliably prevented. Note that, by forming a protrusion along the insertion direction of the nut 13 on the inner surface of the holding portion 19a of the nut holder 19, this can be reliably held in a state where a pressure is applied to the nut 13.

  As described above, each nut holder 19 is incorporated into the bottom of the housing 2 as shown in FIGS. 6 to 8 with the nut 13 held by the holding portions 19 a of the left and right nut holders 19. That is, the holding portion 19a of each nut holder 19 holding the nut 13 is inserted into the nut chamber 17 formed in the bottom portion of the housing 2 in the direction of the arrow, and at the same time, the connecting portion 19b of the nut holder 19 is connected to the vertical rib 18 of the housing 2. Each nut holder 19 can be incorporated into the left and right ends of the bottom portion of the housing 2 together with the nut 13 by being fitted in the fitting grooves 18a (see FIG. 6) formed in the above.

  Next, the crankcase 11 shown in FIGS. 7 and 8 is assembled at the bottom of the housing 2, and the crankcase 11 is secured to the bottom of the housing 2 by screws (not shown) inserted through the insertion holes 20 formed at the four corners. At this time, since the four surfaces a of the crankcase 11 come into contact with the surfaces b of the holding portions 19a of the left and right nut holders 19, from the nut holder 19 and the housing 2 of the nut 13 held by the nut holder 19 The dropout of the is reliably prevented.

  When the nut holder 19 is assembled to the left and right of the bottom of the housing 2 as described above, the bottom cover 12 is put on the bottom surface of the housing 2 and formed at the four corners of the bottom cover 12 as shown in FIGS. The bottom cover 12 can be attached to the bottom surface of the housing 2 by screwing screws 14 inserted into the recesses 12 a from below into the nuts 13.

  Next, operation | movement of the trimming machine 1 comprised as mentioned above is demonstrated.

  When the trigger switch 5 is turned on and power is supplied from the battery 4 to a motor (not shown), the motor is started, and the rotation of the output shaft is decelerated by a reduction gear (not shown) and transmitted to the crank cam 10. The crank cam 10 is rotationally driven. Then, the rotation of the crank cam 10 is converted into a reciprocating motion of the upper blade 6 and the lower blade 7 that engage with the upper and lower eccentric cams of the crank cam 10 respectively.

  Here, since the upper and lower eccentric cams of the crank cam 10 are formed with a phase difference of 180 ° with respect to the rotation center as described above, the upper blade 6 and the lower blade 7 reciprocate alternately in opposite directions. Then, grass and tree branches are pruned by a plurality of cutting blades formed along the longitudinal direction at both edges in the width direction.

  As described above, in the embodiment according to the present invention, the nut holder 19 in which the holding portion 19 a for holding the nut 13 is formed is provided, and the nut holder 19 is held in a state where the nut 13 is held by the holding portion 19 a of the nut holder 19. When the bottom cover 12 is removed for maintenance such as replacement of the upper blade 6 and the lower blade 7 of the blade unit 3, the nut 13 remains the nut holder 19 even if the screw 14 is loosened and removed. Is still held. For this reason, the nut 13 does not fall out of the housing 2, thereby improving the assemblability of the trimming machine 1 and preventing the occurrence of problems such as loss of the nut 13.

  Further, in the present embodiment, two holding portions 19 a are formed on the nut holder 19 so that the two nuts 13 are held by the one nut holder 19. Therefore, it is troublesome to insert a plurality of nuts 13 into the housing 2. As a result, the assemblability of the trimming machine 1 can be further improved.

  Furthermore, in the present embodiment, the nut holder 19 is made of an elastically deformable material such as resin. Therefore, the opening width of the holding portion 19a of the nut holder 19 is made smaller than the width of the nut 13, and the holding portion 19a is elastic. By fitting the nut 13 into the holding portion 19a while being deformed, a preload can be applied to the nut 13, and the nut 13 can be firmly held in the nut holder 19 and reliably prevented from falling off.

  Further, in this embodiment, since the connection portion 19b other than the holding portion 19a of the nut holder 19 is fitted in the fitting groove 18a formed in the vertical rib 18 of the housing 2, the tightening force of the screw 14 is adopted. Therefore, the nut holder 19 is securely held by the housing 2, and the nut holder 19 and the nut 13 held by the nut holder 19 are reliably prevented from falling off the housing 2.

  In the present embodiment, since the crankcase 11 is brought into contact with the nut holder 19 inserted and held in the housing 2 to fix the nut holder 19 to the housing 2, the nut holder 19 is securely attached to the housing 2. The nut holder 19 and the nut 13 held by the nut holder 19 are prevented from falling off from the housing 2 more reliably.

  In addition, in this Embodiment, since the housing 2 was made into the right-and-left 2 division structure, the effect that the assemblability of the trimming machine 1 is improved is also acquired.

  Although the present invention has been described with respect to a mode in which the present invention is applied to a trimming machine having upper and lower blades that reciprocate linearly, the present invention is a clipper blade that alternately swings in the opposite direction around a fulcrum. Of course, the present invention can be similarly applied to a trimming machine including

It is a fracture side view of the trimming machine concerning the present invention. It is a fracture bottom view of the housing part of the trimming machine concerning the present invention. It is a fracture front view of the housing part of the trimming machine concerning the present invention. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is the BB sectional view taken on the line of FIG. It is a fragmentary perspective view which shows the assembly procedure to the housing of the nut holder which hold | maintained the nut in the trimming machine which concerns on this invention. It is a bottom view which shows the assembly direction to the housing of the nut in a trimming machine which concerns on this invention, a nut holder, and a crankcase. It is a fracture | rupture front view which shows the assembly direction to the housing of the nut in the trimming machine which concerns on this invention, a nut holder, and a crankcase. It is a fracture front view of the housing of the conventional trimming machine. It is CC sectional view taken on the line of FIG. It is a fracture | rupture front view of the housing which shows the insertion procedure of the nut to the housing bottom part in the conventional trimming machine. It is a partial bottom view of the housing which shows the insertion procedure of the nut to the housing bottom part in the conventional trimming machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crop machine 2 Housing 2A, 2B Housing split piece 2a Housing handle 3 Blade unit 4 Battery 5 Trigger switch 6 Upper blade 7 Lower blade 8 Holder plate 9 Blade holder 10 Crank cam 11 Crank case 11 Bottom cover 12a Bottom cover Recess 13 Nut 14 Screw 15 Housing flange 16 Groove 17 Nut chamber 18 Housing vertical rib 18a Vertical rib fitting groove 19 Nut holder 19a Nut holder holding portion 19b Nut holder connecting portion 20 Crank case insertion hole

Claims (6)

In a trimming machine that attaches a nut to a housing and disassembles and assembles with a screw screwed into the nut,
A trimming device comprising a nut holder formed with a holding portion for holding the nut, the nut holder being inserted and held in the housing in a state where the nut is held in the holding portion of the nut holder. Machine.   The trimming machine according to claim 1, wherein a plurality of the holding portions are formed in the nut holder.   The trimming machine according to claim 1 or 2, wherein the nut holder is made of an elastically deformable material.   The trimming machine according to any one of claims 1 to 3, wherein a portion other than the holding portion of the nut holder is inserted and held in the housing.   The trimming machine according to any one of claims 1 to 4, wherein another member is brought into contact with the nut holder inserted and held in the housing to fix the nut holder to the housing.   The trimming machine according to any one of claims 1 to 5, wherein the housing has a left and right divided structure.

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