US391885A - Clamp-barrel for clock-springs - Google Patents

Description

(No Model.) BEST AVAxLABLE COP" 0.3mm? CLAMP BARREL POR'GLOGK SPRINGS.

No.' 391,885. Patented 0013.30, 1888.

u. meas. mm wm ma UNITED STATES PATENT OFFICE;

BESIAl/AlLABLE COP` CHARMES E. EHERY, OF BROOKLYN, NEW' YORK.

CLAMP-BARREL FOR CLOCK-SPRINGS.

SPECIFICATION forming-part of Letters Patent No. 391,885, dated October 30, 1888.

Application filed December 8, 1887. Serial No. 256,859. (No model.)

To all whom it may concern:

Beit known that I, CHARLEs E. EMERY, of Brooklyn, Kings county, New York, (office, New York city,)have invented a new and uscfnl Clamp-Druin for Clocks; and I do hereby declare that the following is a full, clear, and exact description of the invention, reference being had to the accompanyi ng drawings, forniing part oi" this specification.

IIn the cheaper form of clocks, of what I call the going-arbor type,77 it is customary to for-m a loop in the outer end ofthe mainspring, which is slipped over one of the posts of the frame, and the motion is communicated to the great-wheelarbor or staff by connecting the same-with the spring at the center, the great wheel being driven through a pawl by a ratchet-whecl on such staff. In such an arrangement the great wheel is receiving no power from the spring during the operation of winding. In another plan used, called the goingbarrelf used in watches and marine clocks, the spring is coiled :in and. the outer end secured to a drum carrying the great wheel, while the center of the spring is secured to the staff, 'which is turned only during the operation of winding, and at other times is held fast bya ratchet-wheel on same engaging with a pawl on the frame. The latter plan has the advantage, first, that the winding is done in thc same direction as the movement of the great wheel, so that the latter is receiving the force of the spring during the operation of winding as well as at other times, and, moreover, the outer coils of the spring are kept concentric with the axis and wound ofi' regularly from the staff to the interior ofthe barrel, whereby a more uniform force is imparted to the train than by the method first described, in which the mainspring, as it runs down, is by its side attachment carried laterally through the openings between the posts of the frames, and which in case of breakage is liable to injure the mechanism of the clock. Vith a going-barrel the spring and barrel are removed together as a unit in taking down the clock. Vith the going-arbor forni the spring ordinarily flies out as the plates of the clock are separated unless such spring be first wound tight and a clamp formed like the letter C .be

slipped over it and the spring released within it, in which case the staff, great wheehspring, and clamp may be taken out together.

The object of this invention is to provide for usc in connection with the going-arbor arrangement a combined clamp and drum which will hold the spring within bounds the same as the ordinary jobbers clamp, but which may at the same time be secured in the case so as to hold the exterior of the spring, when in operation, concentric with the arbor, and thus secure three of the features of excellence of the going-barrel plan-to wit, the centering of the spring, the facility of removing same with the great wheel and its arbor, and the keeping of the spring in bounds in case of breakage, though notof itself forming a retaining-power, as in the ease-of the going-barrel.

In the drawings, Figure 1 is a side View, partly in section, showing the frames, pillars, and great Wheel, with going-arbor and spring. Fig. 2 is a sectional elevation of a portion of the clock with the front plate removed and a shorter spring than would ordinarily be used applied to show the general features of coustruction. Fig. 3 is a face view of a clampdrum of the simplest form.

A is the rear plate of the clock, to which are secured pillars o a2 cf'. y

A is the front plate of the clock, attached to the pillars by screws in the usual way.

B is the great wheel, and bits arbor, the two being connected on the going arbor plan through a ratchet-wheel, c, and pawl on wheel, as is customary.

The dotted' lines D are intended to show the location ofthe seconds-wheel andthose marked d the location of the pinion on the secondswheel staff. A

E represents the mainspring, and F the improved clamp-drum. The inner end of the mainspring E is to be secured to an enlargement of the main arbor or staff b of the great wheel in the customary way, and the outer end of same is preferably to be secured by causing a hole in the same to engage with a hook,f, on the interior of the clampdruni F, thereby enabling the clamp-drum to be made a continnous ring. A s shown by the dotted lines at g, the drum may have a notch cut through its IOO side and the spring be lun through the same, so that a loop thereon will engage with a pillar or stud in the customary way.

The general features of the clam p-drum in simple form are shown on asmall scale in Fig. 3. Such drum may be simply a short cylinder of metal to contain the spring, provided with a hook, f, to receive the end of the spring, and means should be provided to keep the drum concentric with the staff b of the great wheel in any customary manner-as, for instance, by pins hh h, against either one of which the protruding end of a pin,f, or othervprojection may engage to prevent the drum from turning. In practice, however, it is preferred to make thc drum a little casting of T-shaped scction, provided with arms j j j, Fig. 2, to engage with the regular pillars necessary to secure together the plates of the clock, such as a a2 a, and as shown in Figs. 1 and 2.

XVhen but two pillars are available, the ends of the arms are to be formed into eyes to extend entirely around the same, as at a2 a3,- but where three or more pillars are available and suitably located the ends of the arms may simply be notched to engage with them, as shown at a. The thickness of the clampring when formed of a casting, as shown at Fig. 1, need not be the entire width of' the spring, but more resemble the ordinary clam pring, which is generally made of large wire.

The clamp-drum is to be kept in position near the center of the spring byprojections i ton either side, secured to the clamp-drum or the' arms of same, and abutting loosely against the .plates A A', so that when the front plate, A', is in place the drum will be kept in position concentric with the staff b by the arms j j engaging with the pillars, and in proper position in relation to the depth of the clock by the projections i t". The projections it'may, howcver,be fastened to the frames and abut against the clamp-ring. The clam`p-drum thus ar BEST AVAiLAsLE coe' ranged will always keep the spring central, and thus permit it to be wound to and from the interior, as in the going-barrel system; and, moreover, when the front plate, A', is removed, the spring will simply lic closely against the clamp-drum, and the great wheel and its stali", together with the spring and clamp drum, may all be removed together by simply slipping the arms jjj off the pillars a a t3- an operation as easy as theuse of an ordinary clamp in jobbing work. The customary stop-motion on winding-arbors may in general be omitted when the clamp-drum is used. l

Vhat I'clai'n as my invention, and desire lo secure by Letters Patent, is-

1. A ring-clamp drum for clockmovcments disconnected in construction from the plates butheld in position between them by suitable projections in such manner that it may be removed with thc spring and arbor,substantially as specified.-

2. A non-revolving clamp-drum for clockmovements removable as a whole with the mainspring and provided with, first, a ring to receive the mainspring'; second, arms or points of contact to engage with pillars or equivalents in the clock-frame, and, third, studs or projections to approximately x the distance of the ring from the plates. A

3. In combination with the springarbor of a clock and pillars or studs secured in the plates thereof, a non-revolving clamp-drum provided with arms j j, constructed and operating substantially as described.

4. In combination with the spring-arbor and the plates of a clock, and a non-revolving clampdrum, projections t i, substantially as and for the purposes specified.

CHAS. E. EMERY.l

\Vitncsses:

-GnoRGn C. PENNELL,

Ron'r. M. RnEvs.

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