US663962A - Chain adjustment for cycles. - Google Patents

Description

No. 663,962. Patented Dec. l8, I900. J. B. DUNLOP &. J. B. DUNLDP, In.

CHAIN ADJUSTMENT FUR CYCLES.

(Application filed Mar. 19, 1900.1

2 Sheets-Sheet I.

(No. Model.)

No. 663,962 Patented Dec. l8, I900. J. B. DUNLOP &. J. B. DUNLOP, .IR.

CHAIN ADJUSTMENT FOR CYCLES.

(Application filed Mar. 19, 1900.| (No Model.) 2 Sheets-Sheet 2.

/ /l/IIIIIIIIMIQIIILI/l m2 norms Perms ca. PuoTo-urua, wAswmo'rou, n. c

UNITED STATES PAT NT OFFICE.

JOHN BOYD DUNLOP AND JOHN BOYD DUNL'OP, .lR., OF DUBLIN, IRELAND.

CHAIN ADJUSTMENT FOR CYCLES.

SPECIFICATION forming part of Letters Patent No. 663,962, dated December 18, 1900.

Application filed March 19,1900. Serial No. 9,257. (No model.)

To all whom it may concern.-

Be it known that we, JOHN BOYD DUNLOP and J OHN BOYD DUNLOP, J r., subjects of the Queen of England,residing atDublin,Ireland, have invented certain new and useful Improvements in and Relating to the Chain Adjustment of Cycles, (for which we have made application for Letters Patent in Great Britain, No. 18,239, dated September 9, 1899,) of which the following is a specification.

This invention relates to improvements in the chain adjustment of cycles, its object being to provide a simple chain-adjusting device and to so attach the axle of the drivingwheel to that device or to the fork end of the machine that the wheel may be readily removed without. interfering with the adjustment of the chain.

According to this invention the extremities of the wheel-axle do not protrude through the fork ends, but are drilled and tapped and are secured by bolts which pass through the fork ends. form. Preferably a metal block is provided adapted to slide in the slot of the fork end, that portion of the block which is inside the fork end being conveniently in the form of a saddle or arch which receives the end of the wheel-axle or cone on the axle, while that part of the block which is on the outside of the fork end forms a collar or washer against which the head of the bolt which screws into the end of the axle bears. A bolt or screw is secured to the block, and upon this screw is a flanged nut which works in a plate attached to the fork end. The block and its screw thus form a drag-link, and by turning the nut the position of the block may be altered relatively to the fork end and the chain adjusted. The block need not necessarily extend on both sides of the fork end. The saddle-shaped portion of it may be formed separately, and a ridge or projection may be made on the fork end, so as to bear upon the saddle-shaped part. 4

Whatever may be the particular construction of the chain-adjusting device the wheel is free to be removed on the withdrawal of the bolts without interfering with the adjustment of the chain.

In the accompanying drawings, which illustrate various devices for securing the wheel- The fork ends may be of the usual.

axle and adjusting the chain of a cycle, all according to this invention, Figure l is a side elevation. Fig. 2 is a vertical section on the line 2 2 of Fig. 1. Fig. 3 is a perspective view of the drag-link shown in Figs. 1 and 2. Figs. 4. and 5 are perspective views of another construction of drag-link. Fig. 6 is a vertical section similar to Fig. 2, showing a drag-link of the form shown in Figs. 4 and 5. Figs. 7 and 8 are respectively a vertical section and a side elevation showing another form of draglink in position, and Fig. 9 is a separate perspective view of the drag-link.

Like letters indicate like parts throughout the drawings.

With reference to Figs. 1, 2, and 3, A and A are portions of the backstays of the machine, to which is attached a slotted fork end B. C is a drag-link, comprising a block 0 and a screw 0 One side of the block 0 is in the form of a saddle-shaped portion 0 and slots 0 are provided in the block to accommodate the slotted fork end B. The other side of the block 0 forms a collar or washer 0 D is a non-rotatable wheel-axle the end of which does not extend beyond the inner face of the fork end B, but is drilled and tapped to receive a bolt E, which passes through the block 0 and the slotted fork end B. Flats are preferably formed on the end of the wheelaxle where it enters the saddle-shaped portion 0 of the block 0.

Attached to the ends of the slotted fork end B is an end plate F, and portions of the fork end adjacent to this plate are cut away, as at G, to form a recess in which a flange H of a nut H works. The other portion of the nut H passes through the end plate F, and, as will be readily seen, the rotation of this nut will cause the drag-link O to alter its position relatively to the fork end B. The flange H being held between the fork end B and the fixed end plate F is undetachable, and hence the danger of losing the parts is minimized.

In the construction illustrated in Figs. l,

5, and 6 the washer-like portion of the draglink 0 is dispensed with, the head of the bolt E coming right up against the outer face of the fork end B.

Figs. 7, 8, and 9 illustrate another device according to this invention in which the block 0 of the drag-link does not enter the slot of the fork end B at all, but bears against its inner face, a projection or ridge B being formed on the inside of the fork end B and resting upon the saddle-shaped portion 0 The drawings illustrate the cone as solid with the road-wheel axle; but the cone may be screwed onto the axle, and the wheel-bearing may have either a disk or cone adjustment.

What We claim as our invention, and desire to secure by Letters Patent, is

1. In a cycle the combination of a slotted fork end, a drag-link free to slide Within the fork end, a saddle-shaped portion upon the drag-link, slots in the drag-link to receive the fork ends, a screw attached to the drag-link, a not engaging with the screw and held free to rotate in a recess in the fork end, a nonrotatable Wheel-axle the end of which does not protrude through the fork end but is accommodated in the saddle-shaped portion of the drag-link and a bolt passing through the link and the fork end and engaging with a tapped hole in the end of the wheel-axle substantially as set forth.

2. In a cycle, the combination of a fork end, a wheel-axle, a drag-link slidably mounted on the fork end and having a saddle-shaped portion on the inside of the fork end to receive the axle, means for adjusting the position of the drag-link relatively to the fork end, and a bolt passing through the fork end and the link and engaging with a tapped hole in the end of the axle, substantially as set forth.

In testimony whereof we have signed our names to this specification in the presence of two subscribing Witnesses.

JOHN BOYD DUNLOP.

JOHN BOYD DUNLOP, JR.

Witnesses:

JOSHUA WILBOUR, ARTHUR DONN PIATT.

Images