US479304A - Machine for cleaning and polishing knives - Google Patents

Description

2 Sheets-Sheet 1.

(II-0 Model.) I

- J. PLETSGHER.

MACHINE FOR CLEANING AND POLISHING KNIVES.

Patented July 19, 1892.

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65 :umiiimm I In Hill? 111' ll II M M I W1 W1 avwamtoa MIX (No Model.) 2 Shegts-Sheet 2.

J. PLETSGHER.

MACHINE FOR CLEANING AND POLISHING KNIVES.

No. 479,304. Patented July 19, 1892.

wi/lwwo-ow UNITED STATES PATENT OFFICE.

JOHN PLETSCHER, OF BALTIMORE, MARYLAND.

MACHINE FOR CLEANING AND POLISHING KNIVES.

SPECIFICATION forming part of Letters Patent No. 479,304, dated July 19, 1892.

Application filed March 1'7 1892. Serial No. 425.330. (No model.) I

To all whom it may concern.-

Be it known that I, JOHN PLETSCHER, of the city of Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Machines for Cleaning and Polishing Knives and the Like, of which the following is a specification.

The machine in which my invention is comprised is one in which the knife or other article to be cleaned or polished is inserted between two reciprocating power-driven pads or rubbers which press upon it from opposite sides and move in opposite directions to each other.

I will first describe the machine, and will then point out in the claims those features of it which I believe to be new and of my invention.

In the accompanying drawings, Figure l is a front elevation of so much of the machine as needed for the purpose of illustration with part of the front plate removed. Fig. 2 is an end elevation of the same. Fig. 3 is a perspective View of one of the pads. Fig. 4 is a section on line 4 l, Fig. 3.

The machine is to be provided with a suitable framework and base, by which it may be secured to or supported on a bench, table, or the like. This, however, I have not deemed it necessary to show further than to represent that portion of the frame in which the working parts are located. This portion of the frame consists of the front and back plates A B, connected by suitable pillars or bolsters a. Between said plates are the two friction pads or rubbers 0. They face and press against each other and are supported in guides, in which they reciprocate. Their movement is brought about by any suitable means, consisting in this instance of connecting-rods b, pivoted at one end to the pads and at the other end hung on wrist or crank pins on shaft 0, which by gearing d e is driven from the motor-shaft j, which has on it a handle by which it may be turned. The wrist-pins or crankpieces of shaft 0 are set at one hundred and eighty degrees to each other, the consequence being'that the pads O in reciprocating will move in opposite directions to each other.

The two plates A B are slit, as at g, for the insertion of the knife-blade between the pads, the front plate in addition having an enlarged slot 9' for receiving the ferrule of the knife. The two pads moving as they do in opposite directions to each other neutralize to a great extent each others action on the knife so far as the tendency of the knife to move with either pad is concerned, and the knife thus can be easily held and manipulated, while at the same time it is most effectively cleansed and polished. Each pad consists of a yokelike frame 11, between the arms of which extends the leather h or other flexible or pliable strap. The frame is supported and held in guides j, in which it can reciprocate. The leather strap h at its ends passes back over the arms of the yoke and are secured to bars It 10 therein by hooks or other fastening devices. One of these bars 1:; is movable, being fast to a screw-stem lo, which passes loosely through the back plate of the frame a, and has on its end a nut Z, by which the bar it can be adjusted, so as to tighten the strap h to any extent desired.' Between the back plate of the yoke-frame c' and the leather strap h is interposed a plate-spring m of approximately V form, which is secured by one of its legs to the back plate, while its other and free leg forms a spring backing for the leather strap h, the plate-spring being of substantially the same width as the shank. The free leg of the spring is slightly concave on its acting face between its two ends, as indicated at m, the object of this being to better adapt the pads to accommodate themselves to the shape in cross-section of the knife and to thoroughly clean all parts of the blade from back to edge. Then the two pads are placed as shown in the drawings, their faces are in contact, and are pressed forcibly against each other by the springs m.

Having now described the machine, what I claim therein as new, and desire to secure by Letters Patent, is

1. The combination of the front and back plates A B, provided with slits for the insertion of the knife, the two pads arranged between and mounted to reciprocate in said plates and having spring pressed meeting faces, and means for simultaneously reciprocating the pads in opposite directions to each other, as and for the purposes shown and described.

2. The friction-pads having each a pliable face and a backing consisting of a plate-spring m of approximate V form, in combination with the frame, in which said parts are mounted to reciprocate, and means for reciprocating the pads simultaneously in directions opposite to each other, as herein shown and described.

3. The pads consisting each of a frame,a pliable strap stretched between the arms of said frame, and aplate-spring of approximate V shape interposed between the back plate of the frame and the strap, in combination with the guides, in which said pads are supported and move, and means for reciprocating the pads, substantially as set forth.

JOHN PLETSCHER.

Witnesses:

FRANK O. JACKSON, JOHN C. PLETSCHER, WM. 11. J ONES.

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