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Auto chain tensioner

a chain tensioner and chain technology, applied in the direction of chain saws, metal sawing accessories, manufacturing tools, etc., can solve the problems of a lot of adjustment, and achieve the effect of facilitating the mounting of the chain to the guide bar

Inactive Publication Date: 2006-09-21
HUSQVARNA ZENOAH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] Further, by the sliding mechanism at the chain cover fixing means, one of the slider piece and tensioner is slid in the back and forth moving direction of the guide bar and the other one of the tensioner and slider piece is engaged with the guide bar, so that a sliding of one of the slider piece and the tensioner which slides by the sliding mechanism can move the guide bar in the tension direction of the saw chain by the tensioner or the slider piece connected with the spring.
[0066] With the temporary fixing means, it is prevented that a fixing face of the guide bar inclines in a separating direction from a fixing face of the engine cover when the chain is mounted in a groove formed along a circumference face of the guide bar. As a result, the mounting of the chain to the guide bar is facilitated, which makes it possible for a person who is not familiar with operation of the chain saw to easily and securely mount the chain to the guide bar.

Problems solved by technology

Consequently, it is difficult to provide a tension to the saw chain with a desired tension while fixing the chain cover to the engine cover securely, and each time when providing the tension to the saw chain, an adjustment takes a lot of trouble.

Method used

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Examples

Experimental program
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Effect test

first embodiment

[0090]FIG. 1 is a perspective view seen from a rear side of a disk 15 after disassembling fixing means comprising the disk 15, a slider piece 10 and a tensioner 11 according to the invention. FIG. 2 is a perspective view seen from a front side of the disk 15 after disassembling the disk 15 and a lever 18. In FIG. 1, the lever 18 is omitted.

[0091]FIG. 3 is a plan view showing a slider piece 10 and tensioner 11 on a rear side of a chain cover 2. FIG. 4 shows the disk 15 and the lever 18 of the fixing means on a front side of the chain cover 2 and FIG. 5 shows a part of a sectional view taken along a line V-V in FIG. 4 without the lever 18. FIG. 6 is an outline view of a major portion of an engine cover 1 without the chain cover 2.

[0092] As shown in FIG. 6, a moving direction of a guide bar 3 is restricted by inserting a stud bolt 6 fixed in the engine cover 1 and an unshown guide pin into a guide slit 8 formed in the guide bar 3. Tension can be provided to a saw chain by hanging an u...

third embodiment

[0144] Next, a third embodiment is explained with reference to FIG. 19 wherein a link mechanism is used as means for a sliding of the slider piece 10, a fixing of the chain cover 2 and a fixing of the guide bar 3. Constructions of the slider piece 10 and the tensioner 11 are same as those in a case that the disk 15 is used as a fixing means and thus, same referential numerals are given to same members having same features as those in FIGS. 1 to 13, and thus descriptions thereof are omitted.

[0145] AS shown in FIG. 19, the slider piece 10 is slidably disposed in an unshown chain cover. Further, the slider piece 10 can be disposed via a return spring in the guide portion in the chain cover so as to return to the initial position easily when the chain cover is removed from the engine cover.

[0146] A link 41 is rotatably supported on the chain cover by a link axis portion 41a. A link 40 is rotatably supported on the slider piece 10 via a link axis portion 40a. These links 41 and 40 are r...

fourth embodiment

[0153]FIG. 20 shows the invention wherein the above-mentioned problem at a time of hanging the saw chain is solved and easy operation of hanging the saw chain is enabled. In this embodiment, as shown in FIG. 20, one or more permanent magnet piece 28 as an example of the temporary fixing means is fixed on the contact face of the engine cover 1 which contacts the guide bar. It is preferable to attach the permanent magnet piece 28 to the contact face of the engine cover 1 which contacts the guide bar in such a manner that an attaching face of the permanent magnet piece 28 and the contact face contacting the guide bar lie on a same plane. Furthermore, a magnetic attraction of the permanent magnet piece 28 is required to be strong enough to hold the guide bar 3. If the magnetic attraction is not sufficient, two or more permanent magnet piece 28 may be disposed on the contact face contacting the guide bar.

[0154] As aforementioned, by adopting an easy construction wherein the permanent mag...

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Abstract

The invention relates to an auto tensioner of a chain saw. A spiral guide groove (16) of the disk (15) engages with a protrusion 10a of a slider piece (10) and the slider piece (10) is slidably stored in a guide portion (9) formed in a chain cover (2) via a spring (14). A tensioner (11) comprising a protrusion (11) engaged with a guide bar is slidably stored in the slider piece 10 via a coin spring (12). The protrusion (10a) contacts an outer circumference face of the spiral guide groove 16 on a diameter passing through a rotating center of the disk, and an unshown nut for engaging with a stud bold 6 provided on an engine cover side is attached on the rotating center of the disk (15). A rotation of the disk enables to fix the chain cover (2) and move the guide bar.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an auto chain tensioner providing a tension to a saw chain running along a guide bar by moving the guide bar in a length direction while fixing the guide bar to an engine cover. BACKGROUND OF THE INVENTION [0002] In a conventional chain tensioner, in order to fix the guide bar by providing the tension to the saw chain running along the guide bar between an engine cover and a chain cover, fixing means for attaching the chain cover to the engine cover and moving means for moving the guide lever frontward in order to provide the tension to the saw chain running along the guide bar are independent, respectively. [0003] A structure of a chain tensioner comprising the fixing means of the guide bar and the moving means is proposed, for example, in Japanese Utility Model Publication No. 3085277. A brief explanation of this structure is provided hereinafter. As shown in FIG. 21, a driving piece 58 convexly provided with plural co...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B27B17/00B27B17/14
CPCB27B17/14Y10T83/7226
Inventor SUGISHITA, YUU
Owner HUSQVARNA ZENOAH
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