US655943A

US655943A - Sprocket-wheel.

Info

Publication number: US655943A
Application number: US94800A
Authority: US
Inventors: Elmer S Williamson
Original assignee: Individual
Current assignee: Individual
Priority date: 1900-01-10
Filing date: 1900-01-10
Publication date: 1900-08-14
Anticipated expiration: 1917-08-14

Description

No. 655,943. Patented Aug. I4, I900. E. S. WILLIAMSON.

sPnocKET, WHEEL.

(Application flled 1an. 10, 1900.)

(No Model.)

' A7TOHNEY6.

ELMER S; WILLIAMSON, OF PITTSBURG,PENNSYLVANIA.

SPROCKET-WHEEL.

SiPECIFICATION forming part of Letters Iatent No. 655,943, dated August 14, 1900. Application filed January 10, 1900. Serial No. 948. (No model.)

T0 all whom it may concern:

Be it known that I, ELMER S. WILLIAMSON, a citizen of the United States of America, residing at Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented certain new and useful Improvements in Sprocket-Wheels, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to certain new and useful improvements in sprocket-wheels, and is particularly adapted for use upon bicycles or other machines for transmitting motion.

It is well known in the art of transmitting power and motion by chains and sprocket devices that the wear of the chain upon the sprocket-teeth gradually elongates the interior of the links of the chain, thereby lengthening the links in the operation of the apparatus out of unison with the sprocket-teeth, and thereby impairing and finally destroying the working of the mechanism. 1 One object of my invention is to provide against this drawback to the most successful use of sprocket and chain devices, and it comprises'certain novel means whereby I provide for the re placement of the sprocket-teeth, so that as the chain-links elongate or wear away the teeth may be replaced to accurately compensate for such lengthening of the links, and thereby maintain, unison and synchronism in the movement of the parts requisite to their successful operation. I attain such object by providing the body of the wheel with a series of wedge-shaped openings, in which are removably secured a-series of sprocket-teeth which do not grip between the sidep'lates of the chain, but grip the sides of the center block of the chain.

A further object of my invention is to construct a sprocket wheel of this character which will be simple in its construction,

strong, durable, and efficient in its use, and

In describing the invention in detail ref erence is had to the accompanying drawings,

forming a part of this specification, wherein like numerals of reference indicate corresponding parts throughout the several views, in which v Figure 1 is a side View of my improved sprocket-wheel, partly in' section at the top thereof, showing the position of the chain in relation thereto. Fig. 2 is a front plan view of my improved wheel, showing the arrangement of the teeth. Fig. 3 is a top plan view thereof, showing the position of the chain upon the wheel. Fig. 4 is a front view of one of the sprocket-teeth. Fig. 5 is a side view thereof. Fig. 6 is a sectional view thereof, taken on the line 6 6 of Fig. 4. Fig. 7 is a perspective view of one of my improved teeth. Fig. 8 is a perspective view of a modified form thereof.

Referring to the drawings by reference-numerals, 1 indicates the body of the wheel, which is cast solid of any suitable metallic material and is bored at the center thereof, forming an opening 2 to permit of the mounting of the same upon a suitable shaft or spindle. The periphery of the body portion of the Wheel is provided with a circumferential groove 3 of the desired depth, forming at each side of the wheel the peripheral flanges 4 5, between which are arranged sprocketteeth. The wheel is further provided with a series of wedge-shaped openings near the periphery thereof which extend through a portion of the flanges 4 5 as well as the body of the wheel, and those openings, at one end thereof, are each provided with a transverselyextending key-groove to receive the key (ifor securing the sprocket-teeth 7 in position when they are mounted in the openings and which are substantially wedge-shaped and provided with a groove 8, registering with the keygroove, to receive a portion of the key 6 in the same manner as the key-groove.- These teeth are each provided with a U shaped cutaway portion 9, forming retaining projections 10 11 for the center block 12 of the chain.

13 indicates the side plates of the chain, which are pivotally connected together by means of the chain-rivets 14.

It will be observed that the passage of the chain over the wheel is as follows: The side plates thereof are arranged between a por tion of the teeth, while the center block engages between the retaining projections 10 11 of the teeth.

In the modified form of construction shown in Fig. 8 the inner faces of the retaining projections 1O 11 are each formed with a bearing tenon or shoulder 15, this shoulder bearing against the end of the side plates 13 of the chain. This modified form is identical to the sprocket-teeth heretofore referred to, with the exception of the bearing tenons or shoulders.

It will be observed by the arrangement of the sprocket-teeth in the wheel, as heretofore stated, that the chain when passing over the same is not caught between the side plates for retaining it upon the wheel, but the retaining projections 10 11 engage the center block, as will be seen by referring to the drawings. This toa great extent prevents the wearing of the teeth as well as the side plates. It will also be evident that when one of the teeth is worn the same can be readily replaced Without destroying the whole wheel. All that would be necessary would be to remove the key 6, force the tooth from the wheel, and replace a new one.

It is thought that the many advantages of my improved device can be readily understood from the foregoing description, taken in connection with the accompanying drawings, and it will be noted that various changes may be made in the details of construction without departing from the general spirit of my invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A sprocket-wheel provided with a circumferential groove in its periphery and a series of transversely-extending circumferentially-arranged openings, and a sprockettooth secured in each of the said openings, substantially as herein shown and described.

2. A sprocket-wheel consisting of a solid body portion provided with a circumferential groove in its periphery and a series of suitably-arranged openings, a sprocket-tooth mounted in each of the said openings, and means for securing said teeth in position, substantially as set forth.

3. A sprocket-wheel provided with a circumferential groove in its periphery and a series of suitably-arranged transversely-extending openings, a sprocket-tooth mounted in each of the said openings and projecting in the said groove, and means for securing said sprocket-teeth in position, substantially as described.

4. A sprocket-wheel consisting of a solid body portion provided with a circumferen-v tial groove in its periphery and a series of transversely-extending circumferentially-arranged openings, a sprocket-tooth mounted in each of said openings, and provided with a pair of retaining projections adapted to engage the center block of a chain, and means for securing the said teeth in position, substantially as described.

5. A sprocket-wheel provided with a pair of peripheral flanges and a series of sprocketteeth secured in the said wheel and provided with a pair of retaining projections extending between the said flanges and adapted to engage the center block of a chain.

6. A sprocket-wheel consisting of a solid body portion provided with a pair of peripheral flanges and a series of circumferentiallyarranged openings, a sprocket-tooth mounted in each of the said openings and provided with a pair of retaining projections extending between the said flanges and adapted to engage the center block of a chain, and means for securing each of the said teeth in position, substantially as described.

'7. The combination with a solid body portion of a wheel provided with aseries of suitably-arranged openings, of a wedge-shaped sprocket-tooth suitably secured in each of the said openings and provided with a pair of retaining projections adapted to engage the center block of a sprocket-chain, substantially as described.

8. The combination with a solid body portion of a wheel provided with a series of suitably-arranged openings, of a wedge-shaped sprocket-tooth mounted in each of the said openings and provided with a pair of retaining projections and adapted to engage the center block of a sprocket-chain, and a key securing each of the said teeth in position, substantially as described.

9. The combination with a solid body portion of a wheel provided with a series of transversely-extending openings, of a sprockettooth mounted in each of the said openings and provided with a pair of retaining projections adapted to engage the center block of a sprocket-chain, and means arranged in said openings for securing said teeth in position, substantially as described.

In testimony whereof I afiix my signature in the presence of two witnesses.

ELMER S. XVILLIAMSON.

Witnesses:

JOHN NOLAND, E. W. ARTHUR.

IIO