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US Patent: 764,873
Sawing Machine
Patentees:
William W. Trevor - Lockport, Niagara County, NY
Francis N. Trevor - Lockport, Niagara County, NY

USPTO Classifications:
83/717

Tool Categories:
woodworking machines : circular saws : circular ripsaws

Assignees:
Trevor Manufacturing Co. - Lockport, Niagara County, NY

Manufacturer:
Trevor Manufacturing Co. - Lockport, Niagara County, NY

Witnesses:
M. L. Webster
H. Frost Cushman
R. W. Runser
E. A. Volk

Patent Dates:
Applied: Jun. 01, 1903
Granted: Jul. 12, 1904

Patent Pictures: [ 1 | 2 ]
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"Vintage Machinery" entry for Trevor & Co.
1912 Trevor Manufacturing Co. Catalogue "A"
Description:
Wilhelm & Bonner - patent attorneys

This invention relates to that well-known class of sawing-machines which embody a circular saw, a pendulous bolt-carriage which is provided with means for holding the bolt and which is swung to and fro by the operator for carrying the bolt against the saw and back, and a stationary bolt-gage which is arranged at one side of the bolt-carriage and against which the bolt is pressed by the operator before each movement of the carriage toward the saw to correctly gage the cut. In the operation of these sawing-machines, which are used largely for cutting barrel-headings, shingles, &c., the bolt is moved to the saw in a curved path concentric with the pivotal support for the bolt-carriage, and to secure the most efficient action of the machine the bolt should be supported by the carnage at such an elevation that the bolt strikes the saw first at the upper front edge of the bolt without, however, leaning so much toward the saw that the teeth of the latter will draw the bolt against the saw, because in the latter case the saw is liable to be broken unless the bolt splits under the action of the saw. Furthermore, the bolt should be supported at such a height that the mid-height of the back portion of the bolt moves in an arc passing through the axis of the saw, for in such a case the teeth of the saw will pass out of the bolt at about the middle of its rear side, and the saw will cut most nearly with the grain, and the cut from the-front to the rear side of the bolt will have the least width, whereby less power is expended and the cut is completed by the shortest possible movement of the bolt. Heretofore no provision has been made in sawing-machines of this class for maintaining this desirable relation of the bolt to the saw when operating upon bolts which were shorter than the standard length, and consequently short bolts are cut on such machines at an improper elevation and in an undesirable manner. When cutting very short bolts, an auxiliary grate or bottom has been placed upon the grate at the bottom of the carriage for supporting the short bolt; but this means for overcoming the difficulty is objectionable for several reasons, among them that the radius of the arc in which the bolt swings is thereby shortened and the operator is compelled to lift the carriage and bolt higher in order to clear the saw, thus increasing his labor. Furthermore, such an auxiliary support increases the weight of the carriage, cumbers the carriage with a part which is liable to be disarranged or broken by dropping the bolts on the same, and provides for only one change in elevation. The object of this invention is to render the pendulous bolt-carriage and its guide vertically adjustable to raise or lower the level of oscillation as the length of the bolt may require.

We claim as our invention—

1. The combination of a circular saw, an oscillatory bolt-carriage arranged to swing toward and from the saw, and means for adjusting the axis of oscillation of the carriage in the direction of a line drawn in front of the working side of the saw through the axis of oscillation and tangentially to a circle concentric with the saw, substantially as set forth.

2. The combination of a vertical circular saw, a pendulous bolt-carriage arranged in front of the saw and having its axis of oscillation above the same, and means for raising or lowering said axis, whereby the level or elevation of the oscillation of the carriage is correspondingly raised or lowered, substantially as set forth.

3. The combination of a circular saw, an oscillatory bolt-carriage arranged to swing toward and from the saw, means for adjusting the axis of oscillation of the carriage in the direction of a line drawn in front of the working side of the saw through the axis of oscillation and tangentially to a circle concentric with the saw, a segmental guide for the free end of the carriage, and means for adjusting said guide bodily to correspond with the adjustment of the axis of oscillation, substantially as set forth.

4. The combination of a vertical circular saw, a pendulous bolt-carriage arranged in no front of the saw and having its axis of oscillation above the same, means for raising or lowering said axis, whereby the level or elevation of the oscillation of the carriage is correspondingly raised or lowered, a segmental guide for the lower end of the carriage, and means for raising or lowering said guide at both ends to correspond with the adjustment of the carriage, substantially as set forth.

5. The combination of a frame having an upwardly-extending arm provided at its upper end with a vertical series of holes, a vertical circular saw, a pendulous bolt-carriage, a pivotal support on which said pendulous carriage swings toward and from said saw, means for securing said support in either of said holes in the frame-arm to raise and lower said bolt-carriage, a curved guide for the lower end of said carriage, and means for adjusting both ends of said guide up or down, substantially as set forth.

6. The combination of a frame, a circular saw, a pendulous bolt-carriage, means for adjusting the axis of oscillation vertically, a guide for the bolt-carriage, means for adjusting said guide vertically, and means for adjusting said guide toward and from the flat side of the saw, substantially as set forth.

7. The combination of a frame, a circular saw, a pendulous bolt-carriage, means for adjusting the axis of oscillation vertically, a guide for said bolt-carriage, a vertically adjustable supporting-bar for said guide, and a horizontal screw connecting said guide with said supporting bar for adjusting the guide toward and from the flat side of the saw, substantially as set forth.

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