US418464A

US418464A - Lathe-dog

Info

Publication number: US418464A
Authority: US
Publication date: 1889-12-31
Anticipated expiration: 1906-12-31

Description

(No Model.)

H.. E. HOLMES. LATHE DOG- No. 418,464, PatentedvDec 31', 1889.

UNITED STATES PATENT 0FFICE HERBERT E. HOLMES, OF l/VEST SPRINGFIELD, MASSACHUSETTS.

LATHE-DOG.

SPECIFICATION forming part of Letters Patent No. 418,464, dated December 31, 1889.

Application filed October 31, 1889- Serial No. 328,833. (No model.)

To all whom, it may concern:

Be it known that I, HERBERT E. HoLMEs, a citizen of the United States, residing at West Springfield, in the county of I-Iampden and State of Massachusetts, have invented new and useful Improvements in Lathe-Dogs, of which the following is a specification.

This invention relates to lathe-dogs, the obj ect being to provide an improved implement of this class which is adapted by simple means to bring the piece to which it maybe attached, whereby it is held for turning in a lathe or for other similar operation to a central position in the eye of the lathe-dog, and whereby one dog is adapted in such manner to hold the ends of pieces to be operated upon which have different diameters, and also to efficiently hold metallic pieces having screw-threaded ends to which the lathe-dog is attached without marring or injuring the screw-threaded parts of said pieces; and the invention consists in the peculiar construction of the lathe-dog and its attachments, all as hereinafter fully described, and pointed out in the claims.

In the drawings forming part of this specification, Figure 1 is a rear elevation,and Fig. 2 a side elevation, partly in section, of a lathedog and attachments embodying my improvements, said two figures illustrating said attachments internally screw-threaded. Fig. 3 is a sectional view of that portion of a lathedog surrounding the eye thereof, and showing in section said lathe-dog attachment not screw-threaded, and the binding or set screw of the lathe-dog passing through the side of said attachment. Fig. 4 is a perspective view of the lathe-dog and of a screw-threaded attachment therefor. Fig. 5 is a perspective view of one of said lathe-dog attachments whose interior is not screw-threaded. Fig. 6 illustrates in end view several of said lathedog attachments having different internal diameters.

In the drawings, A indicates the lathe-dog, provided with the usual opening or eye 2, in which the end of a piece of metal or other thing is inserted when the lathe-dog is attached thereto to form a connection therewith and between it and a lathe, whereby rotary motion is imparted to said piece or thing by said lathe, said piece being secured in the lathe-dog by the set-screw 3,the arm 4 of said dog being adapted for engagement with the slotted face-plate on the spindle of the lathe or other object thereon, whereby the lathe-dog and the thing held by it are caused to rotate coincident with the lathespindle in a manner Well known to machinists and others conversant with the use of such tools.

Lathe-dogs as heretofore made, of the description illustrated in the drawings, consisting only of the lathe-dog and its set-screw 3, have contained a circular eye to receive the end of the work not adapted to varying diameters of the pieces of work to which the dog may be applied, and hence when the lathedog so made is attached to the end of a cylindrical piece of metal, or one of other exterior form considerably smaller in cross-section than the eye of the lathe-dog, the latter is with difficulty secured to said piece with the requisite firmness, from the fact that only a small portion of the interior wall of the eye of the lathe-dog is held in contact with the side of the piece secured therein,"and under these conditions the set-screw 3 must necessarily be so forced against said piece as to injuriously indent or mark it; and, furthermore, when it is desired to'attach a lathe-dog of the above description to a piece of metal having a screw-threaded end the dog cannot be attached close to the end thereof or at the end without first putting a nut or similar piece on said screw-threaded part, lest the screw-thread on the piece should be defaced or ruined by the action of the set-screw of the dog, said nut-bearing end of the piece to be operated upon being inserted in the eye of the dog and there secured by forcing the setscrew against the side of the nut.

To obviate the above-named inconveniences and to provide simple andinexpensive means therefor, I construct the lathe-dog A with the eye 2 thereof having on its interior wall a 95 projection or rib c, as shown in Fig. 4, and for the lathe-dog eye thus made I construct several attachments or bushings 5, adapted to be inserted in the eye of the lathe-dog in the positions shown in Figs. 1, 2, and 3 of the draw- :00

named figure, passes through an aperture e i in the side of the bushing 5, when the cyllndrical chamber therein has a plane face or is not screw-threaded, thereby permitting the screw to bear directly against the side of a piece of metal placed through said chamber and bind it rigidly therein when the screw is turned against it to attach the dog thereto. I do not wish it to be understood by the above description that I would not under said circumstances make the eye of the lathe-dog with the rib ctherein, because said rib by its engagement with the bushing, as below described, aids in firmly holding the work from rotating within the lathe-dog while being turned and as firmly as would be the result were the lathe-dog eye cylindrical and the piece of work to which it may be attached fitted closely in the eye and was there secured by said set-screw.

The bushings 5 for a lathe-dog having an eye of a given diameter are of a like ex- .teriorjdiameter to fit said eye, but have varying diameters of chambers b, as shown in Fig. 6, and said bushings have a longitudinal groove 0 in the side thereof, which,

when the bushing is placed in the eye of the 1 lathe -Vdog, receives said projection c on the wallet said eye. The said bushings 5, as be fore mentioned, may be made with either a planechamber, as shown in Figs. 3 and '5, or

with said chamber screw-threaded, as shown in Figs. 2 and at, said bushings, whether having a screw-threaded or plane chamber, be-

ing adapted to be used on different descri'ptions of work in which the lathe-dog is emplo'yed, as above described.

In using the screw-threaded bushing in connection with a metal piece having a screw threaded end, to which it is desirable to attach the lathe-dog, the threaded bushing is placed in the eye of the dog in the position shown-in Fig. 2, the screw 3 being turned thereagainst to hold it from being accidentally drawn outof the eye.

In practice a number of bushings of suitable metallic construction are provided, with each lathe-dog comprising. several having plane chambers Z) therein of diiferent diam-. eters and several having screw-threaded chambers therein, adapted to the screwthreads of the work with which the lathedogs are to be used; or with each lathe-dog are supplied a number of bushings having plane chambers therethrough, and the purchaser of said dogs and bushings may tap them out to suit his convenience, such bushings as shall be internally screw-threaded to be used, as aforesaid, without any side aperture e, and those which are to be used with the plane chamber '1) having said aperture 6 made therethrou'gh.

What I claim as my invention is I In combination, a lathe-dog having a cylindrical eye, a projection on th'jewall of said eye, a set-screw penetrating the same, and a cylindrical bushing having a groove in its surface in which said projection engages, and a side aperture in which said sc'rew enters, substantially as set forth.

2. In combination, a lathe-dog having a cylindrical eye, a projection on the wall of said eye, a set-screw projecting into the same,

and several cylindrical bushings of varying internal diameters, each h'avingfa groove its surface in which said projection engages, and a side aperture in which said screw enters, substantiallyas set forth.

3. In combination, a lathe-dog having a cylindrical eye, a projection on the wall of said eye, a set-screw projecting into the same, and a cylindrical bushing having its chamber screw-threaded, and a groove in its surface in which said projection engages, substantially as set forth.

HERBERT E. HOLMES.

Witnesses:

H. A. CHAPIN,

M. CHAMBERLAIN.