Metal tools and implements – making – Saw-making or furbishing device or machine – Sharpening and gumming
Patent
1981-07-14
1983-11-01
Parker, Roscoe V.
Metal tools and implements, making
Saw-making or furbishing device or machine
Sharpening and gumming
76 25A, 33202, B23D 6310
Patent
active
044124635
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a saw sharpening guide particularly for use in the sharpening of chain saws, however, is also applicable to sharpening of conventional saws, including hand saws.
The two basic requirements of a saw sharpening guide are that the file used in conjunction therewith is at the required angle to the plane of the tooth being sharpened and at the correct depth in relationship to the tip of the tooth.
Many guides have been proposed for this purpose, a number of which are constructed to be clamped or otherwise attached to the saw in order to guide the file in the correct relationship to the tooth. Although many of these guides are quite effective, the need to affix them to the saw blade increases the time required for sharpening each tooth. Other forms of guides are attached to the file and incorporate a sight line to guide the operator in maintaining the file at the correct angle to the plane of the saw. These devices have the disadvantage that the sight line moves with the file, and accordingly it is difficult for the operator to properly observe the relationship between the sight ine and the blade throughout the sharpening operation. Other guide devices are known wherein the file operates against a stationary member, and thus if the member is hardened the file wears, and if the member is not hardened it will wear rapidly.
It is therefore the object of the present invention to provide a saw sharpening guide which is simple and accurate in operation, and does not have the above referred to disadvantages of the known guides.
With this object in view there is provided a saw sharpening guide comprising a support adapted to be positioned in a straddling relation to a saw blade, a pair of rollers mounted on the support for rotation about respective parallel axes, said roller axes having a fixed relative disposition so the rollers lie on opposite sides of the blade when the support occupies said straddling position, a continuous peripheral groove in each roller, said grooves being disposed in a common plane and shaped so that a file seated in both grooves may be reciprocated while in rolling contact with both rollers, the support being selectively positionable on the blade in said straddling relation so the line of reciprocation of the file is inclined to the blade at predetermined opposite angles, said support being adapted to co-operate with the saw teeth to determine the depth position of the rollers.
Conveniently the support is also adapted so that it may be tilted in the direction transverse to the blade to provide an undercut on the sharpened edge of the tooth.
In one of the preferred forms of the guide, sight lines are provided on the support which may be selectively disposed parallel to the blade by manual manipulation of the support. With the sight line in this parallel relationship, the line of the reciprocation of the file is at a predetermined angle to the blade being sharpened. The sight lines are provided in pairs as each alternate tooth must be sharpened with the line of reciprocation of the file at an equal and opposite angle to the blade. More than one pair of sight lines may be provided to accommodate different angles of sharpening to suit various types of saws. The sight line may merely be marked on a surface of the support or may be formed by edges of the support or edges of an aperture provided in the support.
Generally the support member comprises two parallel sections with the rollers located therebetween and supported on stationary pins secured to and extending between the parallel sections. At least one of the parallel sections is provided with a flange extending generally at right angles thereto which is intended in use to rest upon the tip of the saw tooth to be sharpened. The height of this right angle flange relative to the axis of the rollers is set so that when the right angle portion rests on the tip of the tooth, a file located in the grooves of the roller is in the correct relationship to the tooth to effect sharpening thereof by reciprocation of the file. Alter
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