US1085381A - Shell-grinding machine. - Google Patents

Description

F. DI GIANNI.

SHELL GRINDING MACHINE.

APPLICATION FILED JAN.27,1913.

1,0855381. Patented Jan. 27, 1914.

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FRANK DI GIANNI, ORMUSCATINE. IOWA, ASSIGNOB T0 MUSCATINE REARL NOVELTY COMPANY, OF MUSCATINE, IOWA, A CORPORATION OF IOWA.

SHELL-GRINDING mnorx nn.

oeaasr Specification of Letters Eatcnt.

Patented Jan. 27, 1211s.

Application filed January 27, 1913. Serial No. 745,422.

To (ZZZ whom it may concern:

Be it known that- I, FRANK DI Guxxr, of Muscatine, in the county of Muscatine and State of Iowa, have invented certain new and useful Improvements in ShellGrimling Machines; andI hereby declare that the following is a full, clear, and exact description I thereof, reference being had to the accoml pan ing drawings, which form part of this specification.

This invention is a novel machine for grinding pieces of shell and the like in irregular form. it being especially designed for use in grinding pieces of pearl shell into brooches, pins. fobs, buckles, and other ornamcntal articles.

The invention consists in the novel construction of the means for presenting the shell to the grinder so that itcan be ground I to the desired form without any particular attention on the part of the operator other than to rotate the shell support so as to present the shell edgcwise to the grinder; and such means is illustrated in the accompanying drawing and hereinafter described.

In said drawings-Figure 1 is a top plan View of the shell grinding machine, partly broken away. Fig. :2 is an end elevation of Fig. 1, partly broken away. Fig. 3 is a detail section on line 3--3, Fig. 1. Fig. l is a detail View of one of the cams.

The machine comprises -a head plate 1, which preferably formed with a longitudinal dove-tailed groove. in its upper side, in which groove is mounted a slide 2, and said slide is normally projected outwardly by means of a spring 2 interposed between the outer end of the side and a cap plate 1* at ached to the outer end. of the plate 1 as shown. Attached to said slide, and supthe plate 1, is a transverse bearing 2 -for a shaft 3; and this shaft may be removably secured in position in the bearing 2 by having "the cap-plate 2 detachably secured to the base bearing plate by tap bolts so that by removing the cap-plate 2 the shaft- 3 can be bodily rem'oved from the bearing. This shaft 3 is provided, preferably at each end of the bearing, with a cam-3. These cams correspond in external contour to the external contour which it is desired to 1mpart to the shell object. As illustrated the cams are of shield-shape and the shell S will be reduced to a similar shape, as

cated by the dottedline's Fig. In practice interchangeable sets of cams 3 2 of (lllltlllll shapes may be prov ded, one cam or of cams for ea c shape of shell which it- IS desired to produce'by-the machine; such cams may be detachabl'y. at

tached to the shaft 3 in any well known manner; or if desired the cams may be per manently attached to shafts 3, and siich cammed shafts be interchangeable. I T he peripheries of the said cams 3 are adii ted.

I it to move against such spring.

One end of the shaft may be provided with a shell clamp 3 of any suitable construction, to hold a piece of shell S parallel with the cams 3 and perpendicular to the shaft 3. Ordinarily the piece of pearl or shell to be shaped hasan opening through it, which opening corresponds with a stud 3 on the clamp head and the shell S is held endwise against the clamp by means of a screw 3, or in any other convenient way. The particular means for clamping; the shell to the shaft 3 is not a feature of the invention.

Adjacent the clamp 3 is a grinder 5, which may be of carlmrundum or other suitable material. mounted on a spindle :3 which can be driven by a belt 5. or in any other suitable manner. The shaft 3 may he rotat ed manually by means of a handle 23".

The slide 9 may be retracted by means oi a lQVQ-I. fl pivoted at- 6 upon the standard 1 on which plate 1 is supported; and lever 6 may be operated by hand. or may be connected by a rod 6 to a trcadlc lever, not shown, so that it can be. operated by the foot when it is desired to retract the slide Qand withdraw the shell from the grinder 5, against the resistance. of spring 2". The standard I and the spindle of the grinding wheel 5 may be mounted upon a base 7 in any suitable way, so as to hold the said parts in relatively fixed relation.

Operation: When the parts are in the poand she sition indicated in Fig. 1, and a shell S at tached to the end of the shaft 3, said shell will be pressed edgewise into contact with the grinder by the action of'the spring 2 5 on the slide 2, which slide moves the shaft cam and shell bodily, as indicated in the drawing. The movement of the slide will be arrested first by the contact of the edge of the shell with the grinder 5; but as the grinder is rotatedthe shell is cut away and the slide advances the shell toward the cutter until the forward movement of the slide is arrested by contact of the cam or cams 3 with rollers 4. The operator should turn shaft 3 slowly, by means of the handle 3, v and thus present the entire edge of the shell to the grinder, and the latter cuts away the :shelluntil it conforms in shape to the shape 7 of the cams, as will be readily understood 2.0 from the drawing. The piece of pearl or shell S attached to clamp 3 is perferably roughly shaped, beforeit is attached thereto so as to reduce the time and amount of grinding required. i

# It will be seen that by having interchangeable cams, or shafts and cams, the shells may be cut of any desired form or outline; when the operator can rotate shaft 3 without any further firinding contact between the grinder the work iscompleted, and the shell will be of the form of the cams; then by depressing the lever 6 the slide 2 is retracted, moving the finished shell away from the grinder, and'another piece of shell can be operated upon. The cams, or cams and shaft, can be removed and substituted by others to produce the desired shape of shell.

What I claim is: v

The'combination with a support, a grinder rotating on a vertical axis, a slotted plate on said su port, a slidemovably mounted in the slot 0 said plate, a manually rotatable changeable shaft mounted horizontally on and transversely of said slide, a pair. of cams fizied on said shaft at opposite sides of the slide, members attached to the support adjacent the slide and engaging said earns, a clampon the outer end of said shaft for securing a shell thereto; a spring engaging said slide to cause the shaft to yieldingly' hold the shell against the grinder, and a lever and connections for retracting said slide,

substantially as described.

In testimony that I claim the foregoing as I my own, I affix my signaturein presence of two witnesses.

FRANK DI GIANNI. l/Vitnesses PAUL S. BAKER, OWEN E. VA CE;

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