US42767A - Improvement in apparatus for shaving the heads of screw-blanks - Google Patents

Description

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H. A. HARVEY, 0F NEW YORK, N. Y.

IMPROVEMENT IN APPARATUS FOR SHAVING THE HEADS OF SCREW-BLANKS.

Specification forming part of Letters Patent No. 2,767, dated May 17, 1864.

To all whom it may concern:

Be it known that I, H. A. HARVEY, have invented certain new and useful machinery for shaving the heads of screw-bla1'1ks, parts of which are applicable to other purposes; and Ido hereby declare that the following, taken in connection with the drawings, is a full, clear, and exact description theieof.

In the drawings, Figure l is a side elevation; Fig. 2, a plan of the machine; and Fig. 3 an elevation of and section through the cut ter-head, tool-holders, &c.

This machine is similar in many respects to those for nickin g and threading screwblanks invented by me, and for which applications for patents are made cotemporaneously with this one, and the description in this specifica tion will be somewhat general, those desiring more full information being referred to the description of the other machines.

VAll parts of this machine are mounted upon a bed-plate, c a, on which, in proper guides, is supported a carriage or slide, b b, in which is mounted a carrying-wheel, c c, from the periphery of which project a series of spring receivers and holders, d d. These receivers are by preference made of steel turned on the outside and bored out on the inside, and slit, as shown in the drawings. Each receiver'niay, moreover, be provided with a set-screw to close the bottom of its cavity, as shown at e e. Each receiver has its outside beveled at the end thereof; and in line with the axis of the carrying-wheel a conical socket, o, is secured to the bed-plate of the machine. The bore of the receivers :is of such size that screw-blanks will fall easily into them, and the slits are so contrived that the blank can be held or grasped rmly in the carrier, as in a vise, when the conical end of the latteris forced into the conical socket or gripper. This gripper is represented in the drawings as fixed fast to theframe-work, but I prefer in practice to mount it in guides, so that it may slide to and fro in a line between the cutter-h ead shaft and the center of the carrying-wheel, and to locate a spring of indiarubber or other material in such way as to force tl e gripper towards the carrying wheel. By this arrangement I obviate all dificulties arising from unequal diameters of blanks.

The forked carriage b b has depending from it a pin, b', which enters into-a cam-groove, f, of a rotating cam, f. This cam has secured to it a cog-wheel,f2, which is driven by a cogwheel, g, mounted on a shaft, g, on the other end of which is secured another cog wheel, g2, which is in gear with a pinion, 11 fastened to a shaft, h', which latter is to be rotated by any proper machinery. Upon the shaft h is a grooved sliding sleeve, k, and a cutter-head, k', provided with sliding tool-holders k2. A lever, Z, pivoted at l, has on its upper end pins which take into the groove in the sleeve, and this lever is vibrated through the intervention of a rod, l2, which is, by means of a spring, Z3, forced to bear against a face-cam cut on the end of the canrwheel ff. (See sketch in section, Fig. 4.)

The shape of this cam is such as to cause the tools to approach each other gradually while a screw-blank is held for their action and until the shaving is completed, then to recede rapidly from each other and remain in that position until the blank just shaved is withdrawn and a fresh unshaved blank is placed ready for their action, and the camwheel j" makes one revolution during the entering, shaving, and withdrawing of a blank.

To each side of the carrying-wheel are sccured ratchet-teeth m m, and upon the frame is bolted a spring-pawl, n, iu such manner that it may he adjusted so as .to strike against the teeth at the proper time. The carrying- Wheel has also attached to it a series of lugs, as desciibed, in the nicking-machine, and in the drawings is shown a contrivance for feeding blanks to the receivers and holders in all respects the same as in the nicking-machine, and acting in connection with the carryingwheel in the sanne manner as there described but, as in this machine, blanks are operated upon in the condition in which they leave the header, and as there are often burrs on the heads, which will cause the slide z to catch or stick, I prefer, in this machine, to bevel the working side of the latch .c in such manner that it will bend the spring y and y oft' from the lug whenever the slide is jammed or stuck fast, and in this way I prevent fracture of the parts.

The revolving cutter-head for carrying the tool-slides, and the slides, tools, and contrivances for actuating them may be constructed in any usual or proper manner known to makers of screw machinery. I have in the drawings shown the tool secured in blocks or slides 7a2, free to slide in straight lines. These slideshave inclined slots cut through them, into which enter the parts of a fork, p, which is attached to the sleeve 7c. As this sleeve moves back and forth the tools must approach or recede from the blank-head, and I have found this arrangement to answer well in practice. The carrying-wheel is to be provided with holdin g-pawls, as described in the nicking and threading machines, so as to hold it at rest after it has been turned and until one ofthe receivers enters the gripper. rIhe operation of the machine is as follows, supposing the machine to bein position, as shown in the drawings, and three ot' the receivers to to contain screw-blanks: In this position a blank is represented as partially shaved, and until this is completed the tool-head revolves, and the cutters continue to approach each other, while the carrying-wheel remains at rest. As soon as the shaving is completed the tools recede from each other and the groove f draws the carriage and carrying-wheel backward, so that the receiverand blank that it carries are free ofthe socket or gripper o, and the ratchets then strike against the pawls,'which cause the carrying wheel to revolve through the are comprised between two receivers. The socket marked e then becomes upright and lies under the angle formed by the two parts of the ways carrying the column of blanks. A fresh blank is then dropped into the receiver fu, while it and the whole series of receivers and the carryingavheel are being advanced by the cam-groove f. As they are thus advanced the blank next in succession to the one just l shaved is byits carrier forced into the gripper,

and the latter, acting on the conical end of thc v receiver, causes it to grasp the blank Ijrmly. The pin b has now returned again to the srraight part of the groove f, and the tools, which have all this time been revolving without performing any duty, now commence to approach each other and shave the head of the new blank. The blank that has been shaved is carried downward and drops out by gravity. In some cases the blanks may not be forced completely home by gravity into the sockets, and in this case the cutters might be injured. As a measure of precaution, therefore, I intend sometimes to locate a punch such as is indicated at u', Fig. 3, so as to shove the blank home. This punch may be a springpunch always tending to force the blank home, and removed ont ofthe wayrof the cut-ters by an inclined plane on the cutters striking a pin projecting from the punch, or the punch may slide in a cavityin the shaft of the cutter-head and be connected to a sleeve which is moved forward to shove the blank home and then retracted to take the punch out ot' the way ot' the cutters by any proper cam.

The tools may be 0fany proper kind, and operated in any appropriate manner, so long` as they rotate to lshave the head ot" a blank held at rest and open to permit its removal and the entrance of a fresh blank, and it is obvious that parts of this machine, which may be fed by hand or any suitable machinery, may be employed usefully for other purposesfor instance, the carrying-wheel, with its receivers and carriers and gripper or grippingsocket, might be used in connection with a saw mounted on oscillating bearings, thus constituting van flicking-machine.

I claim in this patent as ot' my own invention- The combination of a series of receivers and holders,with a socket or gripper and proper rotating s'havingtools, the whole being and acting in combination under a mode of operation substantially as specified.

H. A. HARVEY.

In presence of- JAs. J. WIGHTMAN, P. JAMns GAGE.

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