US2485389A - Saw filing device - Google Patents

Description

Oct. 18, 1949. LA CLAIR SAW FILING DEVICE Filed Oct 25, 1947 Zhwentor 'l x f/frec/ La [/afr (Ittomeg Patented Oct. 18, 1949 UNITED STATES PATENT OFFICE SAW FILING DEVICE Wilfred L. La Clair, Rochester, N. Y.

Application October 23, 1947, Serial No. 781,714

3 Claims.

The object of this invention is to provide a tool that can be used to hold a three cornered file in the correct angular position while it is being used to push the file back and forth in the filing of the teeth of a saw.

Another object of the invention is to Provide the tool with a so-called pendulum which is connected rigidly to the tool so that it will hang straight down when the three cornered file rests in the triangular space between two teeth of the saw.

Another object of the invention is to provide means for clamping the so-called pendulum in its correct position after the three cornered file has been engaged between two teeth of the saw to be filed.

Another object of the invention is to provide the tool with a handle swiveled thereon by which the tool can be moved back and forth so that the handle cannot disturb the angular position of the file with reference to the teeth of the saw being filed.

These and other objects of the invention will be illustrated in the drawings, described in the specification and pointed out in the claims at the end thereof.

In the drawings:

Figure 1 is a side elevation of the complete tool assembled ready for use.

Figure 2 is an enlarged end elevation of the tool partly broken away, looking at it from the left of Figure l, the file being sectioned away, and the pendulum being partly broken away.

Figure 3 is a vertical section on the line 32:, 3a: of Figure 2.

Figure 4 is a side elevation of the bracket wit the cylinder removed therefrom.

Figure 5 is an end elevation of the metal cylinder and its metal core showing the socket into which the tang is inserted.

In the several figures of the drawing like reference numerals indicate like parts.

The teeth of hand saws require sharpening from time to time and it is well known that they are sharpened by filing them with a triangular or three cornered file. This file is ordinarily set rigidly in a hole provided in a Wooden handle which handle is moved forward and back by hand. In such case the accuracy of the filing depends on the steady hand that holds the file.

The object of my invention is to -make the steady hand unnecessary.

In the drawing showing my invention reference numeral I indicates a three cornered file. All such files have a tapered shank of reduced size 2 that is forced into a suitable hole provided in a wooden handle. This tapered shank of the file is ordinarily called a tang.

For the purpose of my invention I provide a hollow metal cylinder 2 which is filled with a wooden core 3. This wooden core is, provided with a socket 4 into which the tang 5 of the file is inserted. This socket is shown in end elevation in Figure 5.

This cylinder 2 in turn is held in a bracket '6 having a socket l therein, which is adapted to hold the cylinder 2 with its core 3.

This socket is cut away on the under side with a transverse slot as indicated at 8 to receive a U-shaped yoke or bolt 9 that nests into the bracket and makes direct contact with the cylinder 2 on its under side.

On the sides of the bracket are provided the lugs in and II. The lugs are perforated from top to bottom and from below the open ends of the U-shaped yoke or bolt 9 extends up through these holes. The open ends of the U-shaped bolts are threaded with male threads. These threaded ends are engaged with wing nuts I2 and [3 by which the underside of the bolt is drawn up into the slot 8 so that it makes contact with the under side of the cylinder 2 and rigidly fastens the cylinder in any desired angular position with reference to the bracket 6. This angular adjustment of the cylinder 2 can be made either before or after the file is inserted in the core, but would ordinarily be made after the file is inserted in the core of the cylinder than before it is inserted. This adjustment fixes the position of the edge of the file transversely to the pendulum which must always be permitted to hang straight down, it being understood that the edge of the file is held at the bottom of the tooth being sharpened, or that the surface of the file is held against the surface of the tooth being sharpened.

On the under side of the bracket 6 is provided a lug l5, which extends transversely of the bracket. This lug is hollow and carries a bolt l6 therein having a head I! on the right hand end of it and a nut 18 threaded on the left hand end thereof as shown in Figure 2.

A large oval hole or slot I 9 is formed in the bottom of the lug l5 and on the under side of the shankZll of the bolt is formed a hole 2| threaded with a female thread. Into this hole 2| is threaded the end of the stem 22 which at its upper end is threaded with a male thread. On the lower end of the stem 22 is provided a Weight 23, making the stem and weight a. socalled pendulum.

Extending centrally from the right hand end of the bracket as shown in Figures 1 and 3 is a stem 24. This stem is locked in place in the bracket 6 by a set screw 25. On this stem is provided a handle 26 which is swiveled thereon so that the handle can turn freely on the stem, or the stem can turn freely in the handle.

With the parts assembled as above described, the stem 22 should extend down from the bracket 6 and the bolt [6 should be fastened in the lug by the nut [8.

It will be understood that the so-called pendulum which includes the stem 22 and the weight 23 can be moved forward and back, rotatingthe bolt l6 the lug l5. If it moves sideways it will rotate the bracket 5 with it.

The bracket with its handle and, file can be moved forward and back horizontally 'or with the said round opening and having a head on one file tilted up at any angle that may be desired by the filer. If the bracket" and its assembly is tilted up while filing, then the pendulum should be put in a vertical. position or as near to a vertical position as the fixtures that hold the saw will permit. This tilting of the bracket and its file and its handle isindicated by the center line 2'! which center line indicates the position of the axis of the whole assembly;. namely, the bracket, the file and the handle. The pendulum will be held stationary in a vertical position while the assembly is being'tilted, thus changing the angular relation between the pendulum and the bracket 6 and the rest of the assembly as shown in Fig. 1, thependulum is clamped by the bolt l6 and nut H3 at 90 to the axis .of the file, but this angle can be increased within thelimit of the slot l9, as

indicated by the dotted linein Fig. 1.

In the use of this invention, the file will be placed on the teeth so as to nest between two adjacent teeth of the saw to be filed and the thumb nuts l2 and I? will be loosened up so that,

the bracket .6 can .be turned on the cylinder 2, so that the pendulum .will hang straight down therefrom as. shown in the three figures.

The cylinder 2 and-the bracket 6 will then be clamped firmly together by the thumb nuts [2 and i3. Thereafter the file in its backward and forward movement will be held in its correct angular position by the pendulum. The handle 26 being swiveled onthe bracket cannot disturb this correct angular position of the file while it.

is being moved back .and forth, no matter how much the handof the filer or operator may turn. In this way the control of the position of the bracket that holds thefile is taken away from the'hend of the operator because the handle is swivcled and'the file is therefore always held in the same position by the pendulum.

I claim:

1. In a saw filing device the combination of a hollow bracket having a cylindrical hole therein, a cylinder mo-untedin said cylindrical hole, said cylinder having a core therein adapted to hold a file by its tang in line with the cylinder, means for holding said cylinder from turning in said bracket, a handle on said bracket, in line with said cylinder, said bracket having a lug extending downwardly on the bottom thereof, said lug end and a nut on the other end, by which it is clamped axially in said lug, an oval opening in the bottom of said lug below said bolt, a stem engaging said bolt thru said oval opening and extending downwardly therefrom, a weight on the lower end of the stem adapted b gravity to hold the bracket from turning on its axis, said oval opening permitting the pendulum to be clamped in position at 90 or more to the axis or edge of the file, the whole assembly being adaptedto be moved back and forth in filing the teeth of a saw.

2. 'In a sawfiling device the combination of a hollow bracket having a cylindrical hole therein,

a cylinder mounted in said cylindrical hole, said file by its tang in line with the axis of the cylinder, said bracketbeing cut away. on the underside with an arcuate slot, a U-shaped bolt having .two

threaded :ends nested ,in said slot and making contact with said cylinder, lugs on either. side of said bracket through which the threaded ends of said bolt extend upwardly, nuts engagingthe said threaded ends to draw the U-shaped bolt up against its cylinder and its core to clamp them inthe bracket, a handle swiveledon said bracket and adapted to turn thereon independent .ofthe bracket, a pendulum attached to said bracket and adapted to hold ,the bracket and file ina predetermined angular position.

3. In a saw filing device, ahousing having two cylindrical openings therein, one of said openings being at right angles to and below the other opening, a cylindrical. core. mounted in theupper opening, an open halfround slot out in the under side of the upperportion of the housing, lugs on either side of said housing near the top thereof, .a U-shaped bolt engaging with said slot and lugs and wing nuts resting on said lugsclamping the bolt in the slot against the core-in the upper part of .the housing, .a bolt in the cylindrical REFERENCES CITED The following references'are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 360,953 Decker Apr. 12, 1887 377,528 Moore Feb. 7,1888 674,892 Whitten May 28, 1901 1,585,548 Jones May 18, 1926 1,648,426 Sears Nov. 8, 1927 2,194,464 Thomas Mar. 26, 1940

Images