US2704469A - Teeth - Google Patents

Description

March 22, 1955 G. 'w. JOHANSSON APPARATUS FOR SETTING AND GAUGING SAW TEETH Filed April 27, 1953 bvvsuwe; 6 usra v WI'LJIELM Jot/0115.50;

United States Patent APPARATUS FOR SETTING AND GAUGING SAW TEETH Gustav Wilhelm Johansson, Saternas, Horrmund, Sweden Application April 27, 1953, Serial No. 351,210

Claims priority, application Sweden July 8, 19 52 2 Claims. (Cl. 76-71) The present invention relates to improvements in apparatus for setting saw teeth, said apparatus comprising a saw setting device and an instrument secured on the same and provided with a pointer movable over a dial to indicate the set degree, the measuring instrument being adapted to measure the degree of set in the working position of the saw setting device.

According to the invention the saw setting device is adapted by engagement with the saw tooth in view to be held automatically in the given setting position, and to indicate the degree of set. The advantage of said arrangement over known set devices of this type is among others that no incorrect indication of the degree of set may be given on account of manual action of the operator.

The accompanying drawing shows an embodiment of the invention.

Fig. 1 is a side view and Fig. 2 an end view seen from the left in Fig. 1.

On the saw setting device 1 in known manner pro vided with at least one notch 2 for engaging a saw tooth 3 there is pivotally connected by means of a screw bolt 4 a supporting plate 5 that is secured on a measur ing instrument 6. In said instrument 6 there is provided a dial 7 over which a pointer 8 is movable, one end of said pointer being pivoted on a pin 9 secured in the instrument. Furthermore a double armed lever 11 is turnable on a pin secured in the instrument, the longer arm of said lever being adapted to make contact with the pointer 8, and the shorter arm to engage a notch in one side of a movable finger or pin 12 which is slidably mounted in two opposite walls of the instrument and extending through said walls. The pointer 8 is pressed against the end of the longer arm of the lever 11 by means of a tension spring 13, one end of which is secured to the pointer 8 and the other end secured to a wall of the casing of the instrument 11. Furthermore, one end of a tension spring 14 is secured to the handle of the setting device, the other end of the said spring being secured to the casing of the instrument.

2,704,469 Patented Mar. 22, 1955 is placed in known manner so that the saw tooth 3 engages the notch 2, whereupon the setting operation is performed by turning the saw setting handle upwards (in the presumed case) as shown by the arrow in Fig. 1. When thereby the tooth 3 is bent to the left, the instrument is moved correspondingly to the left while the pin 12 remains stationary, whereby the pin 12 is slid to the right relative to the instrument 6, since its left end by action of the spring 14 is pressed against the flat base portion of the saw blade. Thereby the longer arm of the lever 11 is turned clockwise and acts upon the pointer 8, so that it is turned counterclockwise against the action of the spring 13. The turning of the pointer 8 will, of course, be proportional to the degree of set, which consequently is indicated on the dial.

What I claim:

1. A combined saw tooth setting and gauging device comprising in combination a handle having a slit near one end thereof to receive a saw tooth to be set, a frame pivotally connected near said slit to said handle and spring biassed towards the saw blade and including a dial and pointer means, said frame having at the end remote from the handle a head operable for engaging the side surface of the saw blade, and a pin slidably mounted in said frame intermediate the handle and head for engaging said side surface of the saw blade, said pin being operatively connected to said pointer means within said frame for indicating on said dial the position of the pin and thereby of the setting.

2. In a combined saw tooth setting and gauging device, in combination, a handle including means for engaging a tooth to set it angularly of the saw blade, a gauge comprising a casing having a fixed finger operable to make contact with the side surface of the saw blade opposite relative to the direction of tooth setting, said handle being connected to a portion of said casing, resilient means between said portion and said handle and operable to urge the casing towards said side surface during tooth setting, said gauge having indicating means including a movable finger extending from said casing adjacent said portion and operable to make contact with 5 For performing the set operation the saw setting device said side surface at a point spaced from said fixed finger to indicate the extent of movement of said casing relative to said side surface thereby indicating the extent of tooth setting made by said handle.

References Cited in the file of this patent UNITED STATES PATENTS 1,230,166 Hunger June 19, 1917 1,817,272 Schroeder Aug. 4, 1931 FOREIGN PATENTS 53,619 Sweden Jan. 31, 1923 127,652 Sweden Mar. 14, 1950

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