US1470544A - Pivot lathe for watchmakers - Google Patents

Description

Oct. 9, 1923; 1,470,544

D. K. ROBINSON PIVOT LATHE FOR WATCHMAKERS Filed Aug. 5, 1922 WTTTFI TH WITNESSES fwwzw 42%? m 'IIIIIILIVIAW Patented Oct. 9 1923.

1 UNITED STATES "PATENT OFFICE.

DEAN Kayne aoisrnson, or BALTIMORE, MARYLAND.

PIVOT LA'rI-in For. wA'ronMAKnns.

Application filcdAugust 5, 1922. Serial No. 579,859.

To all whomitmay concern. j

Be it known that I, DEAN K. ROBINSON, a citizen of the United States, and a resident of Baltimore, in the county of Baltimore City and State of Maryland,have invented a new and Improved Pivot Lathe forVVatchmakers, of which 'the following is a full,

clear, and. exact description.

This invention relates to pivot straightening devices and lathes for horological balance wheels and train gears, and has reference more particularly to a lathe having one pivot supporting member movable along the axial plane of the pivot, and another movplane transverse to theaxis of the 1 member movable in a plane transverse to the axial planewof the pivot.

Further objects'will appear as the specification proceeds, of which the drawings form one part, it being understood that the same illustrate only one example of the invention, since itcould be easilychanged without departing from the spirit of the invention.

Inthe drawings: a c

Figure 1 isa side viewof the device showin certain of its parts in section to more 0 early illustrate the same; I t

Figure 2 is a top vie-w of the device;

Figure 3 is an end view of the device showing the balance wheel supporting end;

Figure 4 is a detail view of Figure 3 with one supporting member removed; and

Figures 5 and 6 are detail views of an element to be hereinafter referred to.

In carrying out my invention in accordance with the illustrated example, a base or bench plate 1 is provided with openings 2 adapted to receive screws 3 by means of which it is secured to the work bench A. Said bench plate 1 also presents a pair of bores 4: adapted to receive pins 5 forming a part of frame 6, which presents a substantially U-shaped structure with one leg formed with a head 7 throug which exten s a bore 8 adapted to slidably receive a pintle 9. The other leg'of said frame presents a pair of threaded openings 10' andlll adapted to receive a pivot screw 13 and a clamping To the upper end of bar 12 is secured a blade 15 provided withaseries of openings or pivot holes 16, each of which can be brought in line with the. axis of pintle 9 screw 14, respectively, by means of which bar 12 is rookably held against said frame.

by swinging the bar on pivot 13 and clamping the same against movement after the desired adjustment has been made. i i

The blade 15 ispreferably thin to :permit a train gear or balance wheel pivot to proholes in order to have itsprojecting point inspected, straightened or refinished. The pintle 9 has oneend threaded toreceive a nut 17, preferably beveled adjacent its inner .ject outwardly when inserted in one of said end and slotted at its opposite end, as at 18 (Figure l), for providing 'tool engaging members to effect its screwing or junscrewing on the pintle. At the other end of said pintle is arranged a head 18 for moving the pintle in said bore 8 and at a point inter- 1 mediate its ends has a projection, or collar 19, also preferably beveled for a purpose hereinafter set forth.. N v I Said pintle .revolubly carries between its threaded endand the collar 19 a sleeve20 having a grooved pulley 21 at one end and a collar 22 at the other. The bore of said sleeve flares outwardly adjacent its ends to snugly engage the beveled collar 19 and the nut 17 The threaded end of the pintle has I in its center a pivot bearing notch or center point, whereby a train gear can be "interposed and rotatably held between the pintle and the blade 15.

The collar 22 is formed with a slot 23 which preferably has a curved end wall 33 and which splits a portion of said collar into two parts 24 and 25, through which passes an opening 26 adapted to receive the shank of a fork 27. In said slot 23 is arranged a flexible bar 34 which normally presses against the shank 27 when the same is inserted in the openings 26, and thereby the same is held in place against displacement. The fork 27 is adapted to engage the spokes of a balance wheel or the like, and through .it the balance wheel is made to revolve with -the sleeve 20;

The head 7 has a threaded opening 28 intersecting the bore 8 and said opening is adapted to receive a screw 29 which is screwed tight against the pintle 9 to hold the latter in place once it has been moved toward the blade 15 to engage a train gear in terposed between the blade and the pintle.

hen the pivot point ofa balance wheel is desired to be inspected, straightened or repaired, the same is inserted in one of the openings 16, which by means of adjusting screw 14 is brought directly in line with the known in the horological art and therebythe rotation of'said sleeve is imparted through the: fork 27 to the train gearinterposed between the pintle 9 and the blade 15.

' I would state in conclusion'that while the illustrated example constitutes a practical embodiment of my invention, I do not limit myself strictlv to the exact details herein illustrated, since, manifestly, the same can be considerably varied, with-out departing from. the spirit of the invention as defined in the appended claims;

I: claim:

1. Tan. adeviceof the character described, a frame, p'intlemounted on the frame for longitudinal adjustment and. having one end thereof provided with work engaging means, a clamping screw for securing the pintle in adjusted position,..a' blade adj ustably mounted on. the, frame: and having. a plurality of holes; selectively cooperable with the work engaging-means of the pintle for supporting the work for rotary; movement while leaving the same: accessible, and means mounted on the pint-1e for imparting rotary movement torthe Work.

2.11m a device of the character described, a frame, a; pizntle mounted on the frame for longitudinal adjustment and having one end thereof provided with work engaging means, i

a clamping screw for securing the pintle in adjusted position, a blade adj ustably mounted on the frame and having aplurality of holes selectively cooperable with the work engaging means. of the pintle for supporting the Work for rotary movement while leaving the same accessible,said pintle having a portion externally threaded and being provided with a beveled collar, a sleeve fitted on the pintleand having one end shaped to rotatably fit on said beveled collar, a nut engaged with the threaded portion of the pintle and having a beveled end, the sleeve having a beveled portion adapted to rotatably fit the inner end of the nut, a pulley formed on the sleeve and means for transmitting the rotary movement of the sleeve to the work.

3. In a device of the character described, a frame, a pintle mounted on the frame for longitudinal adjustment and having one end thereof provided with work engaging, means, a clamping screw for securing the pintle in adjusted position, a, blade adjustably mounted onrthe frame and having a plurality of holes selectively cooperab'le with the work engaging means of the pintle for supporting the work for rotary movement while leaving the same accessible, said pintle having a portion externally threaded and being provided with a beveled collar, a sleeve fitted on the Pintle and having one end shaped to rota-tably fit on said beveled collar, a nut en gaged with the threadedpo-rtion of the pintle and having a beveled end, the sleeve having a beveled: portion adapted to rotatably fit the inner end of the: nut, a pulley formed on the sleeve and means: for transmitting the rotary movement of the sleeve to the work, said means including a collar carried by the sleeve having a longitudinal opening, and a transverse: slot" intersecting the opening, a for-kcarried in the longitudinal opening of the collar and adapted to be engaged with the work, and a resilient bar arranged 1n the slot and adapted to press against the fork'to hold: the same in position.

DEAN KEYES ROBINSON.

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