US157146A - Improvement in saw-mill dogs - Google Patents

Improvement in saw-mill dogs Download PDF

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US157146A
US157146A US157146DA US157146A US 157146 A US157146 A US 157146A US 157146D A US157146D A US 157146DA US 157146 A US157146 A US 157146A
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saw
improvement
mill
dogs
mill dogs
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/01—Means for holding or positioning work
    • B26D7/02—Means for holding or positioning work with clamping means

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  • the invention relates to means by which the bend may be taken out of a saw-log, and the latter so held as to be conveniently sawed up into planks.
  • the means which I employ consist ot an end-cammed and ratcheted leverhead, a detent-pawl, and a case, all preferably constructed as hereinafter described.
  • A represents a lever-arm, which may be conveniently tted into a socket, A1, cast with the ratcheted cam-head A2.
  • the latter has also a side groove, A3, With opposite catch points a.
  • - B is a detent-pawl, which Works against the teeth of ratchet, so as to hold what has been gained by the lever. It is made of an obtuse-angled form, fulcrumed in the case or box C, and on the bolt C at the vertex of its angle, and Weighted at the rear end.
  • Weight end thus serves to keep the pawl to the ratchet ordinarily, and also to receive a chain, by which the paWl may be conveniently raised by hand, to unlock the lever for a return movement.
  • D is a chain, provided with a fastening-dog, E, that is driven into the 10g at the point of greatest bend or convexity after it has been rolled up against the knees.
  • E fastening-dog
  • the boW of the timber is caused to gradually spring inward to- Ward the middle knee, thus bringing the Whole length of log into alignment, so that the saw readily cuts it up entirely Without Waste or loss of material.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)

Description

s. wT BAKER.
, Saw-Mill Dogs. No.157,146. PatenredN0v.24,1874-.
V Juvend ATTURNEYS. i
UNITED STATES PATENT OFFICEo GEORGE W. BAKER, OF ELIZABETH CITY, NORTH CAROLINA.
IMPROVEMENT IN SAW-MILL DOGS.
Specification forming part of Letters Patent No. 157,146, dated November 24, 1874; application tiled June 16, 1874.
To all whom it may concern Be it known that I, GEO. YV. BAKER, of Elizabeth City, in the county of Pasquotank and State of North Carolina, have invented a new and Improved Saw-Mill Dog; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming a part of this specification, in Which- Figure l is a sectional and longitudinal elevation; Fig. 2, a plan view.
The invention relates to means by which the bend may be taken out of a saw-log, and the latter so held as to be conveniently sawed up into planks. The means which I employ consist ot an end-cammed and ratcheted leverhead, a detent-pawl, and a case, all preferably constructed as hereinafter described.
A represents a lever-arm, which may be conveniently tted into a socket, A1, cast with the ratcheted cam-head A2. The latter has also a side groove, A3, With opposite catch points a.- B is a detent-pawl, which Works against the teeth of ratchet, so as to hold what has been gained by the lever. It is made of an obtuse-angled form, fulcrumed in the case or box C, and on the bolt C at the vertex of its angle, and Weighted at the rear end. The
Weight end thus serves to keep the pawl to the ratchet ordinarily, and also to receive a chain, by which the paWl may be conveniently raised by hand, to unlock the lever for a return movement. D is a chain, provided with a fastening-dog, E, that is driven into the 10g at the point of greatest bend or convexity after it has been rolled up against the knees. As the lever is worked at great advantage by the slowly-decreasing cam, the boW of the timber is caused to gradually spring inward to- Ward the middle knee, thus bringing the Whole length of log into alignment, so that the saw readily cuts it up entirely Without Waste or loss of material.
I am aware that a hoisting device has been employed that exhibits a lever-socket, ratchet, Weighted paWl, lifting chain, and capstan wheel or drum; but
The combination ot' head A2, having leversocket, ratchet, and sprocket-cam, with case C, having detent B, chain D, and dog E, as and for the purpose specied.
GEORGE W. BAKER.
Witnesses l?. J oHN, D. C. LIPPINcoTT.
US157146D Improvement in saw-mill dogs Expired - Lifetime US157146A (en)

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