US508701A

US508701A - James findlay-guild

Info

Publication number: US508701A
Authority: US
Publication date: 1893-11-14
Anticipated expiration: 1910-11-14

Description

2 Sheets--Shee.t l. J. F. GUILD.

DRIVING GEAR.

(No Model.)

Patented Nov. 14, 1893.

In venfo'r;

#1791 eaves; 1 ggazkz 2 Sheets-Sheet 2.

(No Model.)

J. F. GUILD.

DRIVING GEAR.

m: NATIONAL LI'YHOGRAFHING eoMPANv,

WASHINGTON. D. c.

UN ITED STATES PATENT ()FFICE.

JAMES FINDLAY GUILD, OF DUNDEE, SCOTLAND.

'DRlVlNG-G'EAR.

SPECIFICATION forming part of Letters Patent No. 508,701, dated November 14, 1893. Application filed June 13, 1893. Serial No. 477,509- .(hlo'miodeld Patented in England October 13, 1892, No. 18,3,

To all whom it may concern? Be it known that I, JAMES'FINDLAY GUILD, M. I. N. A., consulting engineer and steamshi ps urveyor,a subject oftheQueen of Grcat" Brltaln, residing at 8-3 Ancrum Road, Dundee," Scotland, have invented new and useful I|n-' provements in Driving-Gear for Velocipedes and Crank-Driven Mechanism generally, (for incline, and though designed more especially for use in connection with velocipedes, is applicable to crank driven mechanism of all kinds.

This invention consists mainly in the introduction of a spring or springs between the crank and the shaft or other mechanism driven thereby.

I will now proceed to describe this in vention as applied to velocipedes. Its application to other mechanism will be so well understood that any further description will be unnecessary.

The chain wheel or driving wheel, as the case may be, of the velocipede is mounted upon the crank shaft, or upon a socket to be fixed on the crank shaft, so that it may be free to rotate thereon. In the side of this wheel is made an annular recess or groove to receive a spiral spring suitably bent in a circular form to lie within the said groove. A cover plate or disk is provided to inclose the said groove and retain the springin position. An arm rigidly secured to the crank shaft or socket is made to project through a suitable slot in the side of the recess containing the spring and bear against one end of the said spring. The other end of this spring bears against a proj ectionin the said annular spring chamber.

It Will be seen that rotary motion given to the crank shaft will be conveyed to the chain or driving wheel, as the case may be, through the intervention of the spring contained in the annular recess. On the spring receiving ithe thrust of the arm occasioned by the downward pressure of either of the treadles git is compressed in proportion to the power applied. This compression if on a level road with easy driving is just sufficient to relieve the rider of the concentrated resistance of gthe machine. When the 'machine is being :driven hard the recoilof the spring occasioned by the greater amount of compression carries the crank over the dead centers without depending upon the momentum of the machine for this purpose as in the case of machines of ordinary construction. In short this device absorbs the excess of power given out bythe rider during one part of the stroke and'gives it out to the machine during the other part of the stroke.

In some cases I find it advisable to employ two or more short springs in place of one long one. These are each operated upon by a separate arm projecting from the crank shaft or socket and of course each bears upon a separate projection formed within the annular spring chamber.

In order that my invention may be more fully understood-and carried into practice I will now proceed to describe the same with reference to the accompanying two sheets of drawings of which- Figure 1 is an elevation,and Fig. 2 across section of one form of the hereinbefore described device as applied to the chain Wheel of a velocipede. Figs. 3 and 4 are similar views of a modified arrangement of the same.

As shown at Figs. 1 and 2 a short sleeve a is keyed upon the crank shaft b of the velocipede and carries at one end a radially projecting arm 0 which is inclined to the crank shaft at such an angle that its end enters an annular groove or recess 01 formed in the face of the web of the chain wheel 6. In this groove is placed a helical spring f bearing at one end against a stop g, formed in one with the chain wheel e, and at the other against the radial arm 0 extending from the sleeve a. The spring is retained within the groove by the cover plate h which is screwed or otherwise attached to the face of the chain wheel e. A portion of this plate his removed so as to allow of the clear passage of the radial arm a into the groove cl. The central part of this cover plate as shown at Fig. 2 bears against the end of the sleeve a and so serves to retain the chain wheel 6 in position.

In the arrangement shown at Figs. 3 and 4 the chain wheel is arranged to support two springs f and the sleeve a is provided with two radial arms a one to bear against the end of each of the said springs. The cover plate is of course modified in construction to allow of the entry of the two arms a into the grooves d. In other respects the parts are similar to those already described as an inspection of the drawings will show.

It will be understood that the hereinbefore described device maybe placed upon the axle of a chain wheel with equal success in working, it being only necessary to reverse the device so that it. may rotate in the opposite direction.

\Vhat I claim is 1. In a gear mechanism, the combination of a shaft, agearwheel loosely mounted thereon, having a groove in the face of web, an arm secured to the shaft beside the said wheel, a spring situated in the said groove, and bearing at one end against a stop on the wheel and at the other end on the said arm, and a confining plate for holding the spring in the groove, substantially as hereinbefore setforth.

2. The combination of the crank shaft of a velocipede, a driving wheel mounted loosely thereon, and having an annular groove in the face of its web, the arm 0 secured tothe shaft and having its outer portion inclined so as to enter the said groove, and a spring situated in the said groove between the said arm and a stop on the wheel, substantially as hcreln before set forth.

3. The combination of a shaft, a gear wheel loose thereon, having a recess orgroove in one of its faces concentric with the shaft, an arm a secured to the shaft, a plate It secured to the wheel and havinga recess corresponding with the recess in the wheel and having a portion adjacent to the arm cremoved, and the spring situated in the said recesses, substantially as hereinbet'ore set forth.

4. The combination of the crank shaft of a velocipede, a sleeve a keyed thereto, an arm 0 carried by the said sleeve, a driving wheel having a portion adjacent to the arm a removed and mounted loosely upon said sleeve, and provided with the groove d in its side face, the plate It secured to the wheel, and a spring in the said groove between the wheel and the plate and hearing at one end against the said arm 0, substantially as hereinbefore set forth.

J. F. GUILD.

Witnesses:

Tno. BROWN, ADAM BOWMAN, Law Clerks, N0. 41 Reform Street, Dundee,

Scotland.