JP2014097598A - Chain saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain saw which has high reliability and excellent work efficiency by forming a structure that a chain tension adjustment dial and a guide bar fixing dial itself are not loosened by fastening the guide bar fixing dial for fastening and fixing the guide bar.SOLUTION: By fitting a lock plate 23 to a chain tension adjustment dial 13, and forming zigzag mountain-shape parts 28, 29 which engage with zigzag mountain-shape parts 24a, 24b formed on the lock plate 23, on a guide bar fixing dial 12 and a side cover 20, respectively, and by achieving engagement of the side cover 20 and the lock plate 23 and engagement of the dial 12 and the lock plate 23, fixing of the chain tension adjustment dial 13 and suppression of loosening of the guide bar fixing dial 12 can be achieved.

Description

  The present invention relates to a chain saw provided with a tension dial for adjusting the tension of a saw chain and a guide bar fixing dial.

  A comparative example of an electric chain saw will be described with reference to FIGS. As shown in these drawings, the electric chain saw has an electric motor 2 as a power source built in a housing 1, and a handle 3 is provided behind the housing 1. The handle 3 is provided with a switch 4 for turning on / off the energization of the motor 2.

  A gear case 5 is provided in front of the housing 1, and the gear case 5 has a pinion 6 fixed to the output shaft of the motor 2 for transmitting the rotational force of the motor 2 to the spindle 8, and a pinion 6. An engaged (meshing) gear 7 is built in, and the gear 7 is fixed to a spindle 8 that is rotatably supported by a gear case 5. A sprocket 9 is fixed to the spindle 8.

  A guide bar 10 is attached between the gear case 5 and the side cover 20 so as to be able to move forward and backward with respect to the chain saw body (including a housing 1 with a built-in motor and a gear case 5 with a gear integrated therein). The guide bar 10 is sandwiched and fixed between the gear case 5 and the side cover 20 by turning the guide bar fixing dial 12 mounted on the side cover 20.

  The electric chain saw includes a saw chain 11 that spans both the sprocket 9 and the guide bar 10, and includes a chain tension adjustment mechanism that moves the guide bar 10 forward and backward. As shown in FIG. 10, the chain tension adjusting mechanism has a two-stage gear structure, and is attached to the side cover 20 and has an axis of rotation that coincides with the axis of rotation of the guide bar fixing dial 12. Is formed with an internal gear 14, and a first stage spur gear 15 pivotally supported (rotatably mounted) on the side gear 20 is engaged with (engaged with) the internal gear 14. The drive-side bevel gear 16 of the second stage bevel gear is fixed. The driven bevel gear 17 of the second stage bevel gear is engaged with the driven bevel gear 17, and the driven bevel gear 17 is fixed to the end of the adjusting bolt 18. The adjusting bolt 18 is held by the side cover 20 so as to be rotatable and the axial position is not changed. The female screw portion of the boss 19 is screwed into the male screw portion of the adjustment bolt 18, and the columnar portion of the boss 19 is fitted in the hole 10 a of the guide bar 10. When the adjustment bolt 18 is rotated by adjusting the rotation of the chain tension adjusting dial 13, the boss 19 is moved in the axial direction of the adjustment bolt 18. As a result, the guide bar 10 fitted to the boss 19 is moved to move the chain saw. The chain tension is adjusted. Then, with the guide bar fixing dial 12 loosened, the chain tension adjusting dial 13 is rotated to properly adjust the chain tension, and then the dial 12 is turned to tighten the guide bar 10 with the gear case 5 and the side cover 20. Fix it with a pinch.

  With such a structure, when a peripheral object such as a branch suddenly hits the outer periphery of the guide bar fixing dial 12 and the chain tension adjusting dial 13 during the chain saw operation, the guide bar fixing dial 12 and the chain tension There is a possibility that the adjustment dial 13 is loosened, and the chain tension adjustment and the guide bar fixing are performed again, which may reduce the work efficiency.

JP 2003-251602 A

  As described above, in the structure of the chain saw of the comparative example, the guide bar fixing dial for tightening and fixing the guide bar and the chain tension adjusting dial loosen during the chain saw operation, and the tension adjustment of the saw chain and the guide There is a problem that the bar is fixed again and the working efficiency is lowered.

  The present invention has been made in view of such a situation. The purpose of the present invention is to tighten the guide bar fixing dial for tightening and fixing the guide bar so that the chain tension adjusting dial and the guide bar fixing dial itself are An object of the present invention is to provide a chainsaw that has a structure that is difficult to loosen, is more reliable, and has a high work efficiency.

One embodiment of the present invention is a chainsaw. The chain saw includes a power source, a spindle that is rotationally driven by the power source, and a chain saw body that includes a sprocket that transmits the rotation of the spindle to a saw chain,
A guide bar attached to the chainsaw body so as to be able to advance and retreat;
The saw chain spanning both the sprocket and the guide bar;
A side cover that covers the sprocket and the mounting portion of the guide bar and is fixed to the chain saw body;
A chain tension adjusting dial that is rotatably provided on the side cover and moves the guide bar forward and backward.
A guide bar fixing dial that is rotatably provided on the side cover, is screwed with a screw member on the chain saw body side, and is clamped and fixed in a state where the guide bar is sandwiched between the side cover and the chain saw body; With
A first engagement irregularity is provided on the front side surface of the chain tension adjustment dial, and a second engagement irregularity is provided on the rear side surface so as to rotate integrally with the chain tension adjustment dial. ,
A third engaging uneven portion is fixedly arranged on the back side of the guide bar fixing dial,
A fourth engaging uneven portion is fixedly disposed on the side cover,
At the time of tightening the guide bar fixing dial, the first engaging uneven portion and the third engaging uneven portion are engaged, and the second engaging uneven portion and the fourth engaging uneven portion are engaged. The part is engaged to form a loosening prevention structure.

  In the aspect, the lock plate formed with the first engaging uneven portion on the front side and the second engaging uneven portion on the back side may be fitted into a hole formed in the chain tension adjusting dial. .

  In the above aspect, the first engaging uneven portion and the third engaging uneven portion have a zigzag mountain shape that can mesh with each other, and the second engaging uneven portion and the fourth engaging uneven portion. The parts may also have a zigzag mountain shape that can mesh with each other.

  In the above aspect, each of the first and second engaging concavo-convex portions may be springbackable.

  In the above aspect, the guide bar fixing dial and the chain tension adjusting dial may be coaxially arranged.

  In the above aspect, a spring is provided between the side cover and the guide bar fixing dial to bias the first engaging uneven portion and the third engaging uneven portion away from each other. It is good to have.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the present invention, the guide is provided by providing the engaging concavo-convex portions on both surfaces of the chain tension adjusting dial and also providing the engaging concavo-convex portions that can be engaged therewith also on the guide bar fixing dial and the side cover. By tightening the bar fixing dial, it is possible to engage between the side cover and the chain tension adjusting dial, and between the guide bar fixing dial and the chain tension adjusting dial with the engaging uneven portions, The chain tension adjustment dial and the guide bar fixing dial itself can be structured to be difficult to loosen, thereby realizing a highly reliable and more efficient chain saw.

It is the side view which made one section a section showing one embodiment of the chainsaw concerning the present invention. It is the top view which made the cross section into the part similarly. It is AA sectional drawing of FIG. It is B arrow sectional drawing of FIG. In an embodiment, it is a plane sectional view showing arrangement of a lock plate inserted in a chain tension adjustment dial. It is CC sectional drawing of FIG. It is a perspective view of a lock plate. It is the side view which made a part the chain saw of a comparative example into the section. It is the top view which made the cross section into the part similarly. It is DD sectional drawing of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  A chain saw according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7 show an electric chain saw using an electric motor 2 as a power source, a housing 1 incorporating the electric motor 2, a gear case 5 incorporating a transmission mechanism for transmitting the rotation of the output shaft of the motor 2 to the sprocket 9, etc. The structure of the chain saw body 40 having the same structure as that of the electric chain saw of the comparative example shown in FIGS. 8 to 10 is given the same reference numerals and the description thereof is omitted. The different parts are a guide bar fixing dial 12, a chain tension adjusting dial 13, a side cover 20, and a mechanism corresponding thereto, which will be described in detail below.

  As shown in FIG. 3, a bolt 31 is attached to the gear case 5, and a female screw portion 12 b formed at the center of the shaft portion 12 a of the guide bar fixing dial 12 is formed on the male screw portion of the bolt 31 protruding to the outside of the gear case 5. It is designed to be screwed together. The guide bar 10 attached to the chainsaw body 40 so as to be able to advance and retreat is sandwiched between the gear case 5 and the side cover 20, and the guide bar fixing dial 12 attached to the side cover 20 is turned to turn the guide bar 10. 10 is fixed between the gear case 5 and the side cover 20. The saw chain 11 is stretched over both the sprocket 9 and the guide bar 10 and is tension-adjusted by a chain tension adjusting mechanism that moves the guide bar 10 back and forth.

  The basic structure of the chain tension adjusting mechanism is the same as that of the comparative example shown in FIGS. 8 to 10 and has a two-stage gear structure. That is, an internal gear 14 is formed inside the chain tension adjustment dial 13 that is attached to the side cover 20 and has a rotation axis that coincides with the rotation axis of the guide bar fixing dial 12. The first stage spur gear 15 pivotally supported by 20 is engaged, and the drive side bevel gear 16 of the second stage bevel gear is fixed to the spur gear 15. The driven bevel gear 17 of the second stage bevel gear is engaged with the driven bevel gear 17, and the driven bevel gear 17 is fixed to the end of the adjusting bolt 18. The adjusting bolt 18 is held by the side cover 20 so as to be rotatable and the axial position is not changed. The female screw portion of the boss 19 is screwed into the male screw portion of the adjustment bolt 18, and the columnar portion of the boss 19 is fitted in the hole of the guide bar 10. When the adjusting bolt 18 is rotated by adjusting the rotation of the chain tension adjusting dial 13, the boss 19 is moved in the axial direction of the adjusting bolt 18, and as a result, the guide bar 10 fitted to the boss 19 is moved to move the chain saw chain. It has a structure that adjusts the tension.

  As shown in FIGS. 5 and 6, the chain tension adjusting dial 13 is provided with holes 21, and each hole 21 has a shape shown in FIG. 7 (a shape obtained by bending a plate with a slit in an arc shape). A plate 23 is fitted. Although two hole portions 21 are illustrated, the number of the hole portions 21 may be one or more. In addition, it is assumed that the number of the holes 21 is the same as that of the lock plate 23 so that the lock plate 23 can be fitted therein.

  As shown in FIG. 7, the lock plate 23 has a zigzag mountain-shaped portion 24a as the first engaging uneven portion on the front side (side facing the guide bar fixing dial 12) as the second engaging uneven portion. Are formed on the back side (side facing the side cover 20). Further, by forming the slit 25 from both longitudinal ends of the lock plate 23 toward the intermediate portion, the zigzag mountain-shaped portions 24a and 24b are made elastic so that the springback effect can be obtained. The ridge lines of the zigzag mountain-shaped portions 24 a and 24 b are oriented along the radial direction of the chain tension adjusting dial 13.

  Also, a zigzag mountain-shaped portion 28 as a third engaging uneven portion is fixedly arranged (formed) on the back side of the guide bar fixing dial 12, and a zigzag mountain-shaped portion as a fourth engaging uneven portion is formed on the side cover 20. 29 is fixedly arranged (formed). The zigzag mountain-shaped portions 28 and 29 have a circular shape, and the ridge line of each mountain is oriented along the radial direction of the ring. The zigzag mountain shaped portions 28 and 29 are concentrically arranged and have the same diameter.

  Each zigzag mountain-shaped portion has, for example, a plurality of ridges having a triangular cross section, and the zigzag mountain-shaped portion 24a and the zigzag mountain-shaped portion 28 can be engaged (engaged) with each other. 24b and the zigzag mountain shaped portion 29 can be engaged (engaged) with each other.

  In addition, a coil spring 22 is provided around the shaft portion 12a of the guide bar fixing dial 12 between the side cover 20 and the back surface of the guide bar fixing dial so that the guide bar fixing dial 12 and the chain tension are adjusted. The dial 13 is energized in a direction in which the dial 13 is separated (in a direction in which the zigzag mountain shape portion 28 and the zigzag mountain shape portion 24a are separated).

  In the configuration of the above embodiment, at the time of the chainsaw operation, the guide bar fixing dial 12 is first temporarily tightened. At this time, there is a gap between the zigzag mountain-shaped portion 28 of the dial 12 and the zigzag mountain-shaped portion 24 a of the lock plate 23.

  Next, in order to adjust the tension of the saw chain 11, the chain tension adjusting dial 13 is rotated. At this time, the lock plate 23 rotates together with the chain tension adjusting dial 13, but there is still a gap between the zigzag mountain-shaped portion 28 of the guide bar fixing dial 12 and the zigzag mountain-shaped portion 24 a of the lock plate 23. Therefore, the zigzag mountain-shaped portion 24b of the lock plate 23 can rotate over the zigzag mountain-shaped portion 29 of the side cover 20 without resistance. In this way, the tension adjustment of the saw chain 11 is completed by the chain tension adjusting dial 13.

  Thereafter, the guide bar 10 is fixed by rotating and tightening the guide bar fixing dial 12. At this time, since there is no gap between the guide bar fixing dial 12 and the zigzag mountain-shaped portions 28 and 29 of the side cover 20 and the zigzag mountain-shaped portions 24a and 24b of the lock plate 23, the zigzag mountain-shaped portion 29 of the side cover 20 is eliminated. And the zigzag mountain-shaped portion 24b of the lock plate 23 are engaged, and the chain tension adjusting dial 13 is first fixed (as can be seen from FIG. 7, the zigzag mountain-shaped portion 24b is more than the zigzag mountain-shaped portion 24a. Because the number of mountain shapes is increased).

  When the guide bar fixing dial 12 is further rotated, a resistance that the zigzag crest-shaped portion 28 of the dial 12 gets over the zigzag crest-shaped portion 28 of the lock plate 23 acts, and a tick feel is generated. At this time, since the zigzag mountain-shaped portion 24a of the lock plate 23 is provided with elasticity (spring back function) by the slit 25, the tip of the zigzag mountain-shaped portion 24a is not crushed. When the guide bar fixing dial 12 is tightened, it becomes difficult to loosen due to the engagement between the zigzag mountain-shaped portion 28 of the dial 12 and the zigzag mountain-shaped portion 24 a of the lock plate 23.

  According to the present embodiment, the following effects can be achieved.

(1) The guide bar fixing dial 12 and the chain tension adjusting dial 13 are difficult to loosen, have high reliability, and can improve work efficiency.

(2) Since the zigzag mountain-shaped portions 24a and 24b on the front and back surfaces of the lock plate 23 provided on the chain tension adjustment dial 13 are structured to be able to spring back, the guide bar fixing dial 12 or the chain tension adjustment When the dial 13 is rotated, the zigzag mountain-shaped portions 24a and 24b of the lock plate 23 operate smoothly when they pass over the guide bar fixing dial 12 and the zigzag mountain-shaped portions 28 and 29 of the side cover 20.

(3) A spring 22 is provided between the side cover 20 and the guide bar fixing dial 12 so that the zigzag mountain-shaped portion 24a of the lock plate 23 and the zigzag mountain-shaped portion 28 of the guide bar fixing dial 12 are separated from each other. Therefore, when the chain tension adjusting dial 13 is rotationally adjusted, the guide bar fixing dial 12 can be prevented from rotating together, and a smooth adjustment is possible.

  The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

  Although the said embodiment illustrated the case of the electric chain saw, it may be an engine (internal combustion engine) instead of the motor which is an electric motor.

  A separate lock plate 23 having zigzag mountain-shaped portions 24a and 24b as engaging uneven portions is attached to the chain tension adjusting dial 13, but the zigzag mountain shape as engaging uneven portions is attached to the chain tension adjusting dial 13. The parts 24a and 24b may be integrally formed.

1 Housing 2 Electric Motor 3 Handle 4 Switch 5 Gear Case 6 Pinion 7 Gear 8 Spindle 9 Sprocket 10 Guide Bar 11 Saw Chain 12 Guide Bar Fixing Dial 13 Chain Tension Adjustment Dial 14 Internal Gear 15 Spur Gear 16 Drive Side Bevel Gear 17 Driven Side bevel gear 18 Adjustment bolt 19 Boss 20 Side cover 21 Hole 22 Spring 23 Lock plate 24a, 24b, 28, 29 Zigzag mountain shaped part,
25 Slit 40 Chainsaw body

Claims (6)

A chainsaw body having a power source, a spindle that is rotationally driven by the power source, and a sprocket that transmits the rotation of the spindle to a saw chain;
A guide bar attached to the chainsaw body so as to be able to advance and retreat;
The saw chain spanning both the sprocket and the guide bar;
A side cover that covers the sprocket and the mounting portion of the guide bar and is fixed to the chain saw body;
A chain tension adjusting dial that is rotatably provided on the side cover and moves the guide bar forward and backward.
A guide bar fixing dial that is rotatably provided on the side cover, is screwed with a screw member on the chain saw body side, and is clamped and fixed in a state where the guide bar is sandwiched between the side cover and the chain saw body; With
A first engagement irregularity is provided on the front side surface of the chain tension adjustment dial, and a second engagement irregularity is provided on the rear side surface so as to rotate integrally with the chain tension adjustment dial. ,
A third engaging uneven portion is fixedly arranged on the back side of the guide bar fixing dial,
A fourth engaging uneven portion is fixedly disposed on the side cover,
At the time of tightening the guide bar fixing dial, the first engaging uneven portion and the third engaging uneven portion are engaged, and the second engaging uneven portion and the fourth engaging uneven portion are engaged. A chain saw characterized in that the part engages to form a locking structure.   A lock plate having the first engaging uneven portion on the front side and the second engaging uneven portion on the back side is fitted in a hole formed in the chain tension adjusting dial. Item 12. The chainsaw according to item 1. The first engaging concavo-convex portion and the third engaging concavo-convex portion have a zigzag mountain shape that can mesh with each other,
3. The chain saw according to claim 1, wherein the second engaging concavo-convex portion and the fourth engaging concavo-convex portion also have a zigzag mountain shape that can mesh with each other.   The chain saw according to any one of claims 1 to 3, wherein the first and second engaging concavo-convex portions can each be springbacked.   The chain saw according to any one of claims 1 to 4, wherein the guide bar fixing dial and the chain tension adjusting dial are coaxially arranged.   A spring is provided between the side cover and the guide bar fixing dial, and the first engaging uneven portion and the third engaging uneven portion are biased in a direction away from each other. The chain saw according to any one of claims 1 to 5, characterized in that

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