US1378287A - Center finder and punch - Google Patents

Description

J. SHAYLOR.

CENTERVFINDER AND PUNCH. [APPLICATION FILED Aus .2s. '1917.

1 ,3781287 Patented May 17, 1921.

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Be-it known that I, Jon SHAYLOR, a citizen of the United States,'residing at Lin denwold, in the county of Camden and State of New Jersey, have invented certain new and useful Improvements in Center Finders .and Punches; and'l do hereby de-'- clare the following to be a full, clear, and

exact description of the invention, such as will enablewothers skilled in the artto which itappertains to make and use the.

same.

This invention relates to a center finder andpunch, and the primary object of the invention is to provide a punch especially adapted for finding. ters of shafts.

Another object of the invention is the provision of means for automatically bringing the punch directly in the center of the and marking. the censhaft, so that the punch can be actuated soas to accurately mark the center of the shaft in a comparatively short time.

A further object of the invention is the provision of a hollow frusto-conical member carrying a sliding'punch on its upper end,

the frusto-conical member forming a guide for the work, so that the punch will automatically be positioned in the-exact center of the work. l i

A still further object of the invention is the provision of; an adjustable guide caried by the lower portion of the frustoholding the same in position in the frustoconical member, while the sliding punch isbeing actuated. V

A still further object of the invention is the provision of means for moving the slid ing punch downward into engagement w1ththe work after the center has been found,

so that the same can be forcibly brought into engagement with the work to mark the center on the shaft.

A still further object of the invention is the provision of a center finder and punch of the above character, which is durable and efficient in use, one that is simple and easy to manufacture and one that can be placed upon-the market at a reasonable price. 7

-With these and'other ob ects 1n v1ew the invention consists in the novel construc-- tion, arrangement and formation of parts,

as will be hereinafter more specifically described, claimed and illustrated in the aconn'rnn rrivnnn nlvn'rnncrr.

I specification of Lettersiatent. t nt M fy 17;" Application fil ed August 29, 1917. Serial 110.188,?86. 1

companying drawings, thereof, in which a through the improved center finder and punch, and i forming a part 1 Figure 1' is a vertical section taken Fig. 2 is a section taken on the line 2--2 I of F ' Referring to whereln slmllar reference numerals desig nate corresponding parts throughout the cates the improved center finder and punch, which includes a hollow frusto-conical member'2 having a' tubular housing 3 formed'on its upper surface asat 1.

the drawings in, detail,

several views,'the numeral- '1 generallyindi-..

punch 5 is slidably mounted in the tubular I housingand consistsof a cylindrical shank threaded as at 10 and receives an internally threaded cap 11, which closes the upper end of the tubular housing. The cap 11 is provided-with a central opening 12 through which the upper end of the shank of thepunch protrudes and the cap forms a guide for the punch 5. i r p An outwardly extending ear 13 is formed on the lower edge of the .frusto-conica-l member. 2 and supports a guide 14:. The guide 14' includesa horizontally extending arm 15 and adownwardly extending right angularly positioned arm 16 .which is adaptedto bear against the work afterthe same has been placed in the frusto conicalmember 2. v v I A diagonal brace arm 17 extends from one arm tothe other and forms a rigid structure.

The horizontal arm 15 isprovided 'witha slot 18 through which extends the set screw 19. The set screw 19 extends through an aperture in the ear 13 and a winged nut 20 is fitted on the-end of the set screw and by loosening or tightening the setscrew 19 the guide 14 can be moved inwardly or outwardly.

The tubular housing?) is providedwith a vertical guideslot 21 through which ex- I ,tends the actuating pin 22. The pin 22 is i guide l4 is then moved into engagement threaded into the shank of the punch 5 and by moving the same, the punch can, be brought downward into engagement with the work against the tension of the spring 8. y In operation of the improved center finder: and punch, the work which may be either a square or round shaft is positioned in the frusto-conical'member which will guide the same upward and position the punch 5 directly overvthe center of the shaft. The

with the work and the winged nut is tightened to hold the guide arm in engagement with the work and the pin 22 is then moved downwardly so as to position the punch in engagement with the work and then the punch is struck with a hammer or the like so as to mark the center on the shaft,

Inpractice, I have found that the form of my invention, illustrated in the accom-4' pany ng drawings and referred to in the above description, as the preferred embodiment, is the most eficient and practical; yet

realizing the conditions concurrent. with the adoption of my device will necessarily vary,

I desire to emphasize the fact that various minor changes in details of construction,

" proportion'and arrangement of parts may annular flange, a tubular housing slidably receiving the punch and having an inner annular flange engaglng'the punch, and

provided at its lower end-with a flared guide member, a cap grooved in-itslower side to receive the upper end of the housing and centrally apertured to receive the punch,

and an expansion spring encompassing thepunch and confined between the annular flanges of the housing and punch.

I In testimony whereof I aflix my signature in presence of two witnesses. V I

' JOHN SHAYLOR Witnessesr CHARLES SHAYLOR, EDWARD F. IRWIN.

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