JP2011177798A - Engine tool - Google Patents

Abstract

An engine tool including a vibration isolator excellent in durability against fastening is provided.
A chain saw is an engine tool including a main body having a prime mover, a handle, and a vibration isolator that connects the main body and the handle. The vibration isolator 30 includes a coil spring 31, a connection member 32, a first screw member 33, a second screw member 34, and a third screw member 35. One end of the coil spring 31 is attached to the main body 10 by a third screw member 35. The connection member 32 is attached to the other end of the coil spring 31. The first screw member 33 is formed of a material having higher mechanical strength than the connection member 32, and a part of the first screw member 33 is embedded in the connection member 32. The second screw member 34 is screwed with the first screw member 33 to fix the connection member 32 to the handle 20.
[Selection] Figure 1

Description

  The present invention relates to an engine tool including a vibration isolator that reduces vibration transmitted from a prime mover to a handle.

  An engine tool such as a chain saw has a coil spring or elastic rubber between a main body having a prime mover and a handle gripped by the worker in order to reduce vibration transmitted to the worker from a prime mover such as a two-cycle engine or a four-cycle engine. An anti-vibration device using an anti-vibration member such as the above is provided. For example, the vibration isolator disclosed in Patent Document 1 is attached to a coil spring (coil spring) and one end and the other end of the coil spring, and fastened to a main body (saw body) and a handle (handle part), respectively. Connecting member (bracket). Such a connection member is generally formed of a synthetic resin and is fastened to the main body and the handle by being screwed directly with the screw member.

JP-A-6-155335

  The vibration isolator for an engine tool is repeatedly fastened to the main body and the handle, for example, for maintenance. However, the connecting member formed of synthetic resin is likely to be deformed or worn by screwing with the screw member, and there is a problem in durability against fastening.

  In view of the above problems, an object of the present invention is to provide an engine tool including a vibration isolator having excellent durability against fastening.

In order to achieve the above object, an engine tool according to the present invention comprises:
A main body having a prime mover;
A handle,
An engine tool comprising a vibration isolator for connecting the main body and the handle,
The vibration isolator is
A coil spring having one end attached to either the main body or the handle;
A connecting member attached to the other end of the coil spring;
A first screw member formed of a material having a higher mechanical strength than the connection member, at least a portion of which is embedded in the connection member;
A second screw member that is screwed with the first screw member and fixes the connection member to either the main body or the handle;
It is characterized by that.

For example, the first screw member is a bolt having a polygonal head embedded in the connection member,
The second screw member may be a nut.

  In this case, it is desirable that a recess is formed in the screw tip of the first screw member.

Further, for example, the first screw member is a polygonal nut embedded in the connection member,
The second screw member may be a bolt.

  The one end portion of the coil spring is formed with a reduced coil diameter, and is engaged with the one end portion of the coil spring and is screwed into one of the main body and the handle. Therefore, it is desirable that the main body and the handle are fixed to each other.

The connecting member is
A first connecting portion attached to the other end of the coil spring;
It is desirable to have a second connection portion coupled to the first connection portion and fixed to either the main body or the handle.

  ADVANTAGE OF THE INVENTION According to this invention, an engine tool provided with the vibration isolator excellent in durability with respect to fastening can be provided.

(A) is a left view which shows the chain saw which concerns on embodiment of this invention. (B) is the II sectional view taken on the line in (a). (A) is a right view which shows the chain saw shown by FIG. (B) is the II-II sectional view taken on the line in (a). (A) is a bottom view which shows the chain saw shown by FIG. (B) is the III-III sectional view taken on the line in (a). (A)-(e) is sectional drawing which shows the procedure which attaches the vibration isolator which concerns on embodiment of this invention to a main body and a handle.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  The engine tool according to the embodiment is a chain saw 1 shown in FIGS. 1, 2, and 3. The chain saw 1 includes a main body 10, a handle 20, and a vibration isolation device 30.

  The main body 10 includes an unillustrated engine (prime mover), a casing 11 that covers the engine, a chain blade 12 that is driven by the engine, and the like. The engine is composed of, for example, a four-cycle internal combustion engine. The casing 11 is composed of a plurality of members that cover the side surface and the upper surface of the engine, and is mainly formed of synthetic resin.

  The handle 20 includes a rear handle 21 and a front handle 22. The rear handle 21 is disposed behind the main body 10 (on the side opposite to the chain blade 20), and the front handle 22 is disposed straddling the left, upper, and right sides of the main body 10. The rear handle 21 and the front handle 22 are fastened to each other on the right side shown in FIG. 2A and the lower side shown in FIG.

  The main body 10 and the handle 20 are connected to each other via three anti-vibration devices 30 as shown in FIGS. 1 (b), 2 (b), and 3 (b).

  The vibration isolator 30 includes a coil spring 31, a connection member 32, a first screw member 33, a second screw member 34, and a third screw member 35.

  The coil spring 31 is a compression coil spring formed of, for example, a steel wire, and a pigtail end (a shape wound inward in the coil radial direction) that engages with the third screw member 35 is formed at one end thereof. ing.

  The connecting member 32 is formed from a synthetic resin in a substantially cylindrical shape, and is formed with a first connecting portion 32 a in which a spiral groove is formed so as to be fitted to the other end portion of the coil spring 31. A second connection portion 32b that is not provided.

  The first screw member 33 is a bolt having a polygonal head such as a hexagonal bolt or a square bolt, and has a mechanical strength (for example, tensile strength, shear, etc.) than the connection member 32 such as carbon steel or stainless steel. Strength, hardness, toughness, fatigue strength, etc.). The first screw member 33 is provided coaxially and integrally with the connection member 32 by insert molding, the head is embedded in the connection member 32, and the screw portion protrudes from the second connection portion 32b. In addition, a slit-like recess 33 a is formed at the screw tip of the first screw member 33.

  The second screw member 34 is a polygonal nut such as a hexagonal nut or a square nut, and is screwed into the first screw member 33. The connection member 32 and any one of the main body 10 and the handle 20 are fastened by the first screw member 33 and the second screw member 34.

  The third screw member 35 is a tapping screw having a head portion formed with, for example, a cross hole or a hexagonal hole. The screw portion of the third screw member 35 has an outer diameter inserted through one end portion (pigtail end) of the coil spring 31, and the head portion of the third screw member 35 is one end portion (pigtail) of the coil spring 31. End). The third screw member 35 fastens one end (pigtail end) of the coil spring 31 to either the main body 10 or the handle 20.

  Next, with reference to FIG. 4, a procedure for attaching the above-described vibration isolator 30 will be described.

  First, as shown in FIG. 4A, the third screw member 35 is formed on the handle 20 while engaging one end (pigtail end) of the coil spring 31 with the third screw member 35. By tightening the screw hole 26, one end of the coil spring 31 and the handle 20 are fastened.

  Next, as shown in FIG. 4B, the first connection portion 32 a of the connection member 32 is fitted to the other end portion of the coil spring 31 while rotating the connection member 32. At this time, the connection member 32 has a direction in which the first screw member 33 protrudes from the coil spring 31.

  Next, as shown in FIG. 4C, the main body 10 is disposed on the second connection portion 32 b of the connection member 32 while the first screw member 33 is inserted through the hole 16 formed in the main body 10. . The hole 16 is configured to be larger than the diameter of the first screw member 33 and does not screw with the first screw member 33.

  Next, as shown in FIG. 4D, the connection member 32 and the main body 10 are fastened by tightening the second screw member 34 to the first screw member 33 protruding from the hole 16 of the main body 10. In addition, when rotating the 2nd screw member 34, the 1st screw member 33 can be prevented from rotating by pressing down the recessed part 33a of the 1st screw member 33 with the front-end | tip of a flat-blade screwdriver. Alternatively, the first screw member 33 may be prevented from rotating by pressing the second connecting portion 32b of the connecting member 32 located between the coil spring 31 and the main body 10 with a finger. it can.

  As described above, the main body 10 and the handle 20 are connected to each other via the vibration isolator 30 as shown in FIG.

  Moreover, what is necessary is just to implement the above-mentioned procedure reversely, when removing the vibration isolator 30. FIG.

  As can be understood from the above description, all the steps of attaching and removing the vibration isolator 30 can be performed from one direction in the axial direction of the coil spring 31 (right side in FIG. 4).

  Further, the vibration isolator 30 may be attached to the main body 10 and the handle 20 in the opposite direction to the above description. In FIG. 1B and FIG. 3B, similarly to the above description, one end (pigtail end) of the coil spring 31 and the handle 20 are fastened by the third screw member 35, and the connection member 32 and the main body are connected. 10 is fastened by a first screw member 33 and a second screw member 34. On the other hand, in FIG. 2B, contrary to the above description, one end (pigtail end) of the coil spring 31 and the main body 10 are fastened by the third screw member 35, and the connection member 32 and the handle 20 are Fastened by the first screw member 33 and the second screw member 34. Thereby, about any vibration isolator 30, it arrange | positions so that the 2nd screw member 34 may be exposed to the outer surface of the chain saw 1, and it can attach or detach easily.

  As described above, the chain saw 1 of the present embodiment connects the main body 10 having the engine, the handle 20, the main body 10 and the handle 20, and suppresses vibration transmitted from the main body 10 to the handle 20. 30.

  As seen in the prior art, according to the vibration isolator configured to provide a screw hole in the connecting member and tighten the screw in the screw hole, the screw hole of the connecting member is worn by the tightening of the screw. The member may not be fixed to the main body or the handle. However, according to the vibration isolator 30 of the present embodiment, the connecting member 32 made of synthetic resin is provided integrally with the first screw member 33 that is a metal bolt, and the second screw member 34 that is a nut. By screwing, durability of the connection member 32 against fastening can be improved. Specifically, even if the first screw member 33 and the connection member 32 are fixed to each other and the second screw member 34 is firmly tightened to the first screw member 33, the relative rotation does not occur. The connecting member 32 does not wear out. Further, vibration due to wear of the connection member 32 and further wear of the connection member 32 due to this are not generated. Therefore, durability against fastening of the connection member 32 can be improved.

  Further, the first screw member 33 is constituted by a bolt having a polygonal head, such as a square bolt or a hexagon bolt, for example, so that the connection member 32 and the first screw member 33 are prevented from slipping and connected. The durability of the member 32 can be further improved. Furthermore, the manufacturing cost can be reduced by using off-the-shelf bolts or the like as the first screw member 33.

  In addition, a pigtail end is formed at one end of the coil spring 31, and the one end (pigtail end) of the coil spring 31 and the main body 10 or the handle 20 are directly fastened by a third screw member engaged therewith. Thus, all the steps of attaching and removing the vibration isolator 30 can be performed from one direction in the axial direction of the coil spring 31, particularly from the outside of the chain saw 1. Therefore, the attachment work and the removal work of the vibration isolator 30 can be facilitated, and the work space can be reduced. Further, since one end (pigtail end) of the coil spring 31 suitably absorbs a load and vibration perpendicular to the axial direction of the coil spring 31, the durability of the main body 10, the handle 20, and the connection member 32 is further improved. In addition, loosening of the first screw member 33, the second screw member 34, and the third screw member 35 can be prevented.

  In addition, this invention is not limited to the above-mentioned embodiment, What changed variously in the range described in the claim is also contained in the technical scope of this invention.

  For example, in the embodiment, the first screw member 33 embedded in the connection member 32 is a bolt, and the second screw member 34 screwed into the first screw member 33 is a nut. The first and second screw members are not limited to this. For example, the first screw member embedded in the connection member is a nut, and the second screw member screwed with the first screw member is a bolt. Also good.

  In addition, the first screw member according to the present invention is not limited to a bolt having a polygonal head and a polygonal nut. It may be a bolt having a substantially circular head or a substantially circular nut, a bolt having an elliptical head, or an elliptical nut.

  In the embodiment, the connection member 32 is made of synthetic resin and the first screw member is made of metal. However, the connection member and the first screw member according to the present invention are not limited to this, It is only necessary that one screw member is made of a material having higher mechanical strength (for example, tensile strength, shear strength, hardness, toughness, fatigue strength, etc.) than the connection member.

  In the embodiment, the third screw member 35 is a tapping screw. However, the third screw member according to the present invention is not limited to this, and for example, a stud bolt is provided on the main body or the handle, and a third screw member 35 is provided. The screw member may be a nut.

  In addition, in embodiment, although the chain saw 1 was demonstrated as an example of an engine tool, this invention is not limited to this, If the main body which has a motor | power_engine and a handle can be connected with a vibration isolator, For example, the present invention can be applied to various engine tools such as an engine brush cutter and an engine blower. The engine tool according to the present invention is not limited to a four-cycle engine, and various prime movers such as a two-cycle engine can be employed.

  In addition, the material, shape, quantity, arrangement, and the like of each component can be appropriately changed as long as the object of the present invention can be achieved.

DESCRIPTION OF SYMBOLS 1 Chain saw 10 Main body 11 Casing 12 Chain blade 16 Hole 20 Handle 21 Rear handle 22 Front handle 26 Screw hole 30 Vibration isolator 31 Coil spring 32 Connection member 32a 1st connection part 32b 2nd connection part 33 1st screw member 33a Concave portion 34 Second screw member 35 Third screw member

Claims (6)

A main body having a prime mover;
A handle,
An engine tool comprising a vibration isolator for connecting the main body and the handle,
The vibration isolator is
A coil spring having one end attached to either the main body or the handle;
A connecting member attached to the other end of the coil spring;
A first screw member formed of a material having a higher mechanical strength than the connection member, at least a portion of which is embedded in the connection member;
A second screw member that is screwed with the first screw member and fixes the connection member to either the main body or the handle;
An engine tool characterized by that. The first screw member is a bolt having a polygonal head embedded in the connection member,
The second screw member is a nut;
The engine tool according to claim 1. A recess is formed in the screw tip of the first screw member.
The engine tool according to claim 2. The first screw member is a polygonal nut embedded in the connection member,
The second screw member is a bolt;
The engine tool according to claim 1. One end portion of the coil spring is formed with a reduced coil diameter, and is engaged with the one end portion of the coil spring and is screwed into one of the main body and the handle, Fixed to either the main body or the handle;
The engine tool according to any one of claims 1 to 4, wherein the engine tool is provided. The connecting member is
A first connecting portion attached to the other end of the coil spring;
A second connection portion coupled to the first connection portion and fixed to one of the main body and the handle;
The engine tool according to any one of claims 1 to 5, wherein:

Images