JP4194032B2 - Anti-vibration coil spring holder - Google Patents

Description

  The present invention relates to an anti-vibration coil spring holder in a portable power working machine such as a power blower equipped with a two-cycle internal combustion engine or the like as a prime mover, a backside spreader, a backlash type brush cutter, or a chain saw.

2. Description of the Related Art Conventionally, in the portable power working machine, an airframe that comes into contact with the internal combustion engine part and the back or hand of the worker so that vibrations generated by the operation of the internal combustion engine are not directly transmitted to the worker's body. Between the holding portion, a coil spring, rubber, and a vibration isolating member combining them are interposed (see Patent Documents 1 and 2, etc.).
JP 2002-206596 A JP 2002-178223 A

  When a coil spring is employed as the vibration-proof member, it takes a considerable amount of time to attach both ends of the coil spring. That is, conventionally, bolt locking portions are formed at both ends of the coil spring or an extension thereof, and bolts are locked at the respective bolt locking portions, and both ends of the coil spring are connected to the bolt spring by the bolts. It was fixed to the internal combustion engine part side and the holding part side of the airframe that contacts the worker. However, there is a problem that it takes a considerable amount of time to attach and fix the coil spring, and a sufficient anti-vibration effect cannot be obtained.

  In the present invention, the vibration-proof coil spring and the mounting nut are set in a holder in advance to form a unit, and an excellent vibration-proof effect can be obtained by the accurate mounting of the vibration-proof coil spring. The purpose is to make it easier.

  The vibration-proof coil spring holder of the present invention for solving the above-mentioned problems is provided on one side with a fitting portion at one end of the vibration-proof coil spring and an extension of the one end of the vibration-proof coil spring. And a nut holding part that covers the extension part engaged with the engaging part, and the nut held in the center of the fitting part and the holding part of the engaging part. A through hole is formed at a position corresponding to each female screw hole.

  The anti-vibration coil spring holder according to the present invention has the end portion of the anti-vibration coil spring adapted to the conforming portion formed on one side surface thereof, and the engagement formed on the one side surface. The extension portion of the anti-vibration coil spring is engaged with the portion.

  Furthermore, the nut is held by the holding portion, and the extension portion of the vibration-proof coil spring is covered by the nut.

  In the state, the through hole formed at a position corresponding to the female screw hole of the nut held by the holding portion of the engaging portion is on the side of the machine body holding portion that contacts the operator, for example, a backpack. The anti-vibration coil spring is fitted in the holder according to the present invention by fitting a bolt into the through-hole from the mounting hole and screwing it into the female screw hole of the nut. It is accurately attached to the machine body holding part side, for example, the backpack.

  Thereafter, the other end portion of the vibration-proof coil spring is attached to the internal combustion engine portion side. The other end of the anti-vibration coil spring is attached to the internal combustion engine part side through a through-hole formed in the backrest in advance and the through-hole formed in the center of the fitting part of the anti-vibration coil spring holder. Done through the hole.

  That is, the through hole previously formed in the backpack and the through hole formed in the center of the fitting portion of the anti-vibration coil spring holder are aligned with each other, and the anti-vibration coil is formed from both the through holes. A bolt is locked to a bolt locking portion formed in advance at the other end of the anti-vibration coil spring through the spring, and a tool is inserted and used through the through holes. The other end of the spring can be securely attached to the internal combustion engine portion side.

  The embodiment of claim 2 is characterized in that, in the above-mentioned claim 1, a boss portion is formed on the periphery of the through hole on the other side surface of the engaging portion. According to this embodiment, for example, accurate and easy attachment is possible by fitting the boss portion into an attachment hole formed in advance on the back rack side.

  The embodiment of claim 3 is characterized in that, in the above-mentioned claim 1, a boss portion is formed on the periphery of the through hole on the other side surface of the fitting portion. According to this embodiment, the same effect as that of the second aspect can be obtained.

  According to the present invention, the vibration-proof coil spring and the mounting nut are set in a holder in advance to form a unit, so that the vibration-proof coil spring can be mounted with low distortion and accurate mounting. By utilizing the vibration effect to the maximum, a reliable vibration isolation effect can be obtained, and the mounting operation can be facilitated. In addition, it is possible to improve the versatility by using the coil spring for vibration isolation as a unit and handle it as a common part.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. 1 is a perspective view showing a state in which a coil spring, a nut, and a mounting bolt are set on a vibration-proof coil spring holder according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. FIG. 4 is a cross-sectional view of the main part showing a state in which the anti-vibration coil spring holder of FIG. 1 is used for a back support portion of a power blower back rack, and FIG. 4 shows the anti-vibration coil spring holder of FIG. FIG. 5 is a cross-sectional view of a main part showing a state of use in a pedestal part of a backpack, FIG. 5 is a cross-sectional view of a main part showing another embodiment, and FIG. 6 is a use state of a power blower as a portable power work machine. It is a perspective view shown.

  The power blower 20 shown in FIG. 6 includes a backpack 22 having a pair of left and right backbands 21 and 21 so that the operator U can carry it on his back. The back rack 22 is equipped with a centrifugal blower 23 and, for example, an air-cooled two-cycle internal combustion engine 24 as a prime mover for driving the blower 23. An air outlet pipe 28 is connected to the air outlet 25 of the blower 23 through an elbow pipe 26 and a bellows hose 27.

  The backrest 22 includes a backrest portion 22a that extends substantially vertically and a pedestal portion 22b that extends substantially horizontally toward the rear when it is carried from the lower end of the backrest portion 22a. It is integrally molded with an appropriate plastic material. In the figure, reference numeral 29 denotes a portable handle which is configured on the upper portion of the backrest portion 3a and used for carrying by hand.

  A worker U carries the backrest 22 with the pair of left and right backrest bands 21 and 21, is attached to the base end side of the air discharge pipe 28, and includes a grip including an engine control member such as a throttle trigger (not shown). While holding the part 30 and controlling the direction of the air discharge pipe 28 and the internal combustion engine 24, the blow-off operation of the fallen leaves L and the like is efficiently performed by the large amount of air discharged from the air outlet 28a at the tip of the air discharge pipe 28. Can be done automatically.

  In the above-described configuration, a vibration-proof coil spring holder H according to an embodiment of the present invention includes an internal combustion engine 24 part including the centrifugal blower 23 and a body holding of the internal combustion engine 24 part in contact with the worker U. Part, specifically, between the backpack 22.

  The anti-vibration coil spring holder H is formed of a small piece integrally formed of hard plastic or the like, and has an annular one end portion of an anti-vibration coil spring 2 (hereinafter simply referred to as “spring 2”) on one side surface 1 thereof. 2a, and the front end portion of the spring 2 extending from the one end 2a of the spring 2 along the one side surface 1 to the straight line is bent at a right angle, and then folded back into a U shape. Thus, the engaging portion 4 of the extension portion 2b for stably standing the spring 2 and the holding portion 6 of the plate-like nut 5 covering the extension portion 2b of the spring 2 at the engaging portion 4 are formed. The

  In the embodiment of the drawings, the fitting portion 3 that receives the one end portion 2a of the spring 2 has a groove shape composed of an outer wall 3a and an inner wall 3b so that the annular portion of the one end portion 2a of the spring 2 fits. It is configured. The engaging portion 4 on which the extension 2b of the one end 2a is placed is surrounded by a partition wall 7, a holding portion 6 of the nut 5, and an end wall 8.

  The holding part 6 has a locking piece 6a for holding both ends of the nut 5 having two female screw holes 5a, 5a, and slides the nut 5 from the direction of the end wall 8 to a fixed position. It is comprised so that it can hold | maintain. In the embodiment of the drawings, the partition wall 7 is formed with a convex portion 7 a that presses the upper surface of the nut 5.

  Furthermore, one relatively large through hole 11 is formed at the center of the fitting part 3 and is further pierced at positions corresponding to the female screw holes 5a and 5a of the nut 5 held by the holding part 6. A hole 12 is formed.

  Boss portions 10, 10 are formed so as to protrude from the periphery of the through holes 12, 12 on the other side surface 9 of the engaging portion 4. In the figure, 13 and 13 are mounting bolts, and 14 is a single plate washer.

  In FIG. 3, using the anti-vibration coil spring holder H having the above configuration, the spring 2 is connected to the internal combustion engine 24 part side including the centrifugal blower 23 and the internal combustion engine 24 part contacting the operator U. The example attached to the holding | maintenance part side, specifically, the upper part of the said backrest part 22a of the said backpack 22 is shown.

  That is, the back support portion 22a is previously provided with an inlay portion 31 in which the boss portion 10 of the holding portion 6 is fitted, a through hole 32 in which the fitting portion 3 is fitted with the through hole 11, and the engaging portion. 4 through holes 12 and 12 and mounting holes 33 and 33 that match the female screw holes 5a and 5a are formed.

  On the other hand, the one end portion 2a and the extension portion 2b of the spring 2 are fitted to the fitting portion 3 and the engaging portion 4 of the holder H, respectively, and the nut 5 is inserted into the holding portion 6 so that the holder H The spring 2 is temporarily assembled into a unit.

  Thereafter, the temporary assembly unit is applied to a mounting portion to fit the boss portion 10 and the spigot portion 31, and the mounting bolt 13 is inserted from the mounting holes 33 and 33 through the washer 14. The one end portion of the spring 2 is inserted into the hole 12 from the worker U side, and the male screw portions 13 a and 13 a are screwed into the female screw holes 5 a and 5 a of the nut 5. 2a is accurately and reliably fixed to the backrest 22a of the backpack 22.

  Next, the other end portion 2c of the spring 2 is attached to the internal combustion engine 24 portion side including the centrifugal blower 23. In the illustrated example, the other end portion 2c is formed on the backrest portion 22a of the backpack 22. Installation is performed through the through hole 32 and the through hole 11 formed in the holder H.

  That is, as shown by an arrow X in the figure, the bolt 34 is locked to the bolt locking portion 2d formed in advance on the other end 2c of the spring 2 through the inside of the pulling 2 from the through holes 32, 11. Further, the bolt 34 is screwed to the centrifugal blower 23 side through a tool through the through holes 32 and 11, and the other end 2c of the spring 2 is connected to the internal combustion engine 24 portion side including the centrifugal blower 23. Can be securely attached.

  FIG. 4 illustrates the spring 2 using the holder H having the above-described configuration, the internal combustion engine 24 part side including the centrifugal blower 23, the holding part side of the internal combustion engine 24 part contacting the worker U, 3 is an example of attachment between the backpack 22 and the pedestal portion 22b, and only the attachment direction is different, and the others are the same as in FIG.

  FIG. 5 shows another embodiment, in which the boss portion 10a is formed on the periphery of the through hole 11 in the other side surface 9a of the fitting portion 3, and the other configuration is the same as that of the above embodiment. .

It is a perspective view which shows the state which set the coil spring, the nut, and the attachment bolt to the coil spring holder for vibration isolation which concerns on one embodiment of this invention. FIG. 2 is an exploded perspective view of FIG. 1. It is principal part sectional drawing which shows the state which used the anti-vibration coil spring holder of FIG. 1 for the backrest part of the backpack of a power blower. It is principal part sectional drawing which shows the state which applied the anti-vibration coil spring holder of FIG. 1 to the base part of the back cradle of a power blower. It is principal part sectional drawing which shows other embodiment. It is a perspective view which shows the use condition of the power blower as a portable power working machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 One side surface 2 Anti-vibration coil spring 2a One end part 2b Extension part 3 Fit part 4 Engagement part 5 Nut 5a Female screw hole 6 Holding part 9 Other side surface 10 Boss part 10a Boss part 11 Through-hole 12 Through-hole

Claims (3)

On one side surface (1), the fitting portion (3) of one end portion (2a) of the coil spring for vibration isolation (2) and the extension portion of the one end portion (2a) of the coil spring for vibration isolation (2). An engaging part (4b) of (2b) and a holding part (6) of a nut (5) covering the extension part (2b) engaged with the engaging part (4) are formed; The through holes (11, 12) are provided at positions corresponding to the center of the part (3) and the female screw hole (5a) of the nut (5) held by the holding part (6) of the engaging part (4). ) Coil spring holder for vibration isolation. The anti-vibration coil according to claim 1, wherein a boss portion (10, 10) is formed on a peripheral edge of the through hole (12, 12) on the other side surface (9) of the engagement portion (4). Spring holder. The anti-vibration coil spring holder according to claim 1, wherein a boss portion (10a) is formed on a peripheral edge of the through hole (11) on the other side surface (9a) of the fitting portion (3).

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