US812960A

US812960A - Work-holder.

Info

Publication number: US812960A
Application number: US28061405A
Authority: US
Inventors: James W Spence
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-09-29
Filing date: 1905-09-29
Publication date: 1906-02-20
Anticipated expiration: 1923-02-20

Description

PATBNTED FEB. 20, 1906.

J. W. SPENGE.

WORK HOLDER.

APPLIOATION FILED SEPT. 29, 1905.

NITED STATS 'FFII FFICE.

Specification of Letters Patent.

Patented Feb. 20, 1906.

Application filed September 29. 1905. Serial No. 280,614.

To @ZZ whom t may concern:

Be it known that I, JAMES W. SPENCE, a citizen of the United States, and a resident of Racine, in the county of Racine and State of Wisconsin, have invented certain new and useful Improvements in Engravers Work- Holders and I do hereby declare that the following is a full, clear, and exact description thereof.

The invention consists in certain peculiarities of construction and combination of parts hereinafter particularly set forth with reference to the accompanying drawings and subsequently claimed, its object being to facili-A tate the Work of an engraver by providing means for ready clamping of work of various diameters without marring the edge of same, and a further object is to afford a smooth surface for the thumb of the tool-hand ofsaid engraver.

Figure 1 of the drawings is indicated by line l l in Fig. 2 and represents a partly-sectional elevation of the pivotal head of a wellknown type of engravers block surmounted by a work-holder in accordance with my invention, this work holder and the work clamped therein being wholly in section; Fig. 2, a plan view of the work-holder in the position aforesaid, the work in said holder being partly broken away Fig. 3, an elevation of the assemblage aforesaid, partly in section, as indicated by lines 3 3 in Fig. l, Fig. 4, a sectional view of a fragment of the workholder and work; Fig. 5, a plan view of the chucks of the work-holder inverted; Fig. 6, a perspective view of one of said chucks inverted Figs. 7 and 8, plan views of compressible interchangeable work bushings, and Fig. 9 a sectional view of the bushing shown by Fig. 8.

Referring by letter to the drawings, A indicates the pivotal head of an engravers block of ordinary type, B the right and left screw in an angular center slot of said head, and C each of the opposing semicircular jaws having angular Shanks D in sliding fit with said slot and which constitute nuts on said screw. The jaws are provided with the usual series of vertical resesses that ordinarily serve for the reception of pins between which the work is clamped by screw adjustment of said jaws but my invention contemplates the employment ofa pair of chucks in detachable and adjustable connection with the aforesaid jaws and a split springbushing engageable with the chucks to constitute a work-holder. By means of interchangeable bushings the holder can be utilized for work of various diameters.

Each chuck E consists of a segmental block provided with a countersunk upper shoulder Z1, also of segmental contour, on which to support a split-spring bushing F, within which the Work to be engraved is gripped by an adjustment of the jaws C and chucks surmounting the same. A groove c is provided in the bottom of each chuck for the engagement of a pin d, set in a j aW-recess, and it is preferable to provide said chuck with a permanent depending pin e for the en agement of another jaw-recess, this pin eing approximately in line with said groove that extends lengthwise of the chuck. However, the pin may be separable from the chuck. Because of its groove the chuck is readily attachable to a jaw C without particular reference to what one of a line of recesses in said jaw is occupied by the pin d, that engages said groove.

To give the split-spring bushings elasticity and cause them by expansion and contraction to circumferentially adjust themselves to varying diameters of work being held, the majority of them are made of metal rolled thin and hardfand are provided with inner lugs f, on which to seat the work, and with outer lugs g, that rest upon the shoulders b of the chucks; but, as shown in Figs. 8 and 9, the bushing F for the largest diameter of work has a continuous inner ilangef instead of the lugs f of the other bushings, and all the bushings are preferably provided with an inner upper lip h, that laps the work to prevent the same from crowding out under pressure.

For thin work a supporting-washer G or other suitable spacing device is set in a bushing engaging the chucks, and it will be understood that said work is so held that there are no pins, blocks, or other devices in the way of the engraver and th at there is always smooth surface for contact of the thumb of the working hand of said engraver, this being an important feature of advantage.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A work-holder consisting of a pair of chucks attachable to the adjustable jaws of an engravers block, and a split-spring bushing constituting a circumferentially compressible work-support in engagement with the chucks.

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2. A work-holder consisting of a pair of chucks attachable to the adjustable jaws of an engravers block7 and a split-spring bushing having an inner upper lip and which constitutes a compressible work-support in engagement with the chucks.

3. A work-holder consisting of a pair of chucks each provided with a depending pin and an under side groove approximately in line one .with the other, the pin being for engagement of a recess in one of the adjustable jaws of an engravers block and the groove for engagement of a pin projecting from the other of said jaws; and a split-spring bushing constituting a compressible Work-support in engagement with the chucks.

4. A work-holder consisting of a pair of chucks attachable to the adjustable jaws of an engravers block and each having a countersunk upper shoulder of segmental contour, and a split-spring bushing constituting a work-support on the shoulders of said chucks.

5. A work-holder consisting of a pair of chucks each provided with a dependin pin and an under side groove approximaty in line one with the other, the pin being for engagement of a recess in one oi' the adjustable jaws of an engravers block and the groove for engagement of a pin projecting Jfrom the other of said jaws.

In testimony that I claim the foregoing I have hereunto set my hand, at Racine, in the county of Racine and State of Wisconsin, in the presence of two witnesses.

JAMES W. SPENCE.

Witnesses:

W. H. DREW, FRED K. SCHULZ.