US251298A - John h - Google Patents

Description

(No Model.)

J. H. SCHAAL.

FILE CUTTING MACHINE.

No. 251,298. Patented Dec. 20,1881.

FTIELIE I UMI W UNITED STATES PATENT OFFICE.

JOHN H. SGHAAL, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE-HALF TO JAMES E. GEMMILL, OF SAME PLACE.

FILE-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 251,298, dated December 20, 1881. Application filed August 26, 1881. (No model.)

To all whom it may concern Be it known that I, JOHN H. SCHAAL, of the city of Baltimore and the State of Maryland, have invented certain Improvements in File- Cutting Machines, of which the following is a specification.

The object of this invention is to provide in a file-cutting machine a yielding support for the chisel-carrier, or device to which the chisel is secured, in order that in the file-cutting operation teeth may be cut approximating in form to those out by hand in the ordinary manner.

In carrying out my invention I provide the swinging frame in which the chiselcarrier is confined with strips, against which the said carrier bears, the said strips being backed with springs and provided with devices to limit their inner movement, and thereby prevent clamping or binding of the chisel-carrier. An alternative construction is had by fitting the chisel-carrier with yieldingface plates or strips and movement-limiting devices, the adjoining parts of the frame being fixed.

In the further description of my said invention which follows reference is made to the accompanying drawings, forming a part hereof, andin which Figure I is a'partly-sectional front elevation of the chisel-carrier, swinging frame, and their attachments. Fig. II is an exterior side elevation of the principal parts of the machine. Figs. III and-IV illustrate certain modifica-- tions in the construction of the chisel-carrier and swinging frame, as hereinafter described.

Similar letters of reference indicate similar parts in all the views.

regulating-nuts d on the outside A is the stand of the machine, which is of the ordinarydescription. Bis the swinging frame, suspended from the stand A, as is usual in machines of this class; and O is the chiselcarrier, adapted to slide within the frame B.

Referring to Figs. I and II, the swinging frame is provided with strips a, which are sustained in a position slightly separated from the inner surface of the said frame by means of spiral springs b. The inward projection of the strips a is limited by means of bolts c,having heads countersunk in the said strips a, and of the frame.

' ment is not new; but

The required degree of tension of the spiral 5o springs bis effected through the medium of setscrews 6, which bear against the said springs,asshownin thedrawings. Thesprings b are preferably contained in removable cups screwed into the frame; but the same result is produced by merely forming cavities for the springs in the sides or walls of the frame, the said cavities extending only partially through the walls, as will be readily understood. In adjusting the swinging frame for the reception of the chisel-carrier the space between the strips a is first regulated by means of the bolts 0, so that the chisel-carrier may be moved freely therein. The required tension is then placed upon the said strips through the medium of the set-screws e, which, as before stated, bear against the ends of the spiral springs b. By this means the elasticity of the walls of the swinging frame can be increased or diminished without varying to any extent the pressure on the chisel-carrier.

In Fig. III the result as above described is effected by attaching a strip, a, to one side of the chisel-carrier by means of bolts similar to the ones 0 before referred to, and placing the springs bin depressions in the said carrier, and

between the same and the strip. A liner, 9, is set up by set-screws to give theproper width of opening to the frame B.

The construction illustrated in Fig. IV is practically the same as that shown in Fig. III, the only difference being that the carrier is fitted with two of the strips (it instead of one.

I make no claim of invention to parts of the machine not herein described, as the same are of ordinary construction; neither do I claim, broadly, the introduction of a spring and bearing-strip between the chisel-carrier and the frame in which it moves, as such an arrange- What I claim as my invention is 1. In a file-cutting machine, a chisel-carrier confined within a suitable frame, combined with one or more yielding strips situated between the said carrier and its frame, adapted, when adjusted, to yield toward the walls of the frame only, substantially as and for the purpose specified.

2. In a file-cutting machine, the chisel-carrier confined within a frame, having interior strips backed by springs, and devices for adjusting their position in relation to the carrier,

5 substantially as and for the purpose specified.

3. In a file-cutting machine, a frame having interior strips adapted to form a yielding snrface for arresting the vibrations of the contained chisel carrier, the said strips being 10 backed by springs adjustable in position in relation to the chisel-carrier, substantially as specified.

4:. In combination with the frame B, the strips a, springs 11, cups f, set-screws e, and bolts 01, substantially as and for the purpose 15 specified.

J OHN H. SGHAAL. Witnesses:

Jim. T. MADDOX, J. D. HOWARD.

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