US895753A - Convertible bicycle and tandem frame. - Google Patents

Description

PATENTBD. AUG. 11, 1908.

' 0,0. HEDSTROM. CONVERTIBLE BICYCLE AND TANDEM FRAME.

APPLIGATIONFILED MAR.28,1907.

mental frame 01' attachment in place. Fig.

'viewof the foot-rest showing the manner of CARL O. HEDSTROM, OF SPRINGFIELD, MASSACHUSETTS.

CONVERTIBLE BICYCLE AND TANDEM FRAME.

Specification of Letters Patent.

Patented Aug. 1 1, 1908.

Application filed March 28, 1907. Serial No. 365,135.

To all whom it may concern:

Beit known that I, CARL OSCAR HEDsTROM, a citizen of the United States of America, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements in Convertible Bicycle and Tandem Frames, of which the following is a specification.

My present invention relates to the construction of motor cycles and has'as a particular object the conversion of an ordinary motor cycle into a tandem.

It is sometimes very desirable to have an attachment or complemental frame/that can be readily attached to a motor cycle whereby the same can be converted into a tandem; the complemental frame being rovided with a saddle and front wheel so tliat when the same is substituted for the front fork of the ordinary motor cycle a' tandem is produced.

Another object is to provide the complemental frame with means for engaging the crank-hanger of themotor cycle; a further obect is to provide the t'iomplemental frame with a flexible foot-rest and also with means to assist in steering the machine.

This invention relates to the construction shown in my prior United States Letters Patent dated January 29,1907 No. 842,833, to which reference will be made in the body of the specification.

Further objects of the nature and construction of the invention will be fully set forth in the specification.

In the drawings forming part of this application,Figure 1 is a side elevational View of the motor cycle with the comple- 2 is a plan view of a detail construction showing the manner of securing the complemental frame to the crank hanger of t 1e motor cycle. Fig. 3 is a side elevational View of the detail structure shown in Fig. 2, a portion of the same being in section. Fig. 4-is a detailed mounting the same in the lower end of the attachment, while Fig. 5 is a perspective view of the foot-rest detached from the frame.

The framework of an ordinary motor cycle is usually of a diamond shape construction as designated by the reference letter a.

In order to convert the motor eye-h into a tandem it is necessary to provide some means for lengthening the framework of the Ina-g chlne, and in order to accomplish tlr .result, i

I have found it convenient to replace the ordinary front fork of the machine, which carries the forward wheel, and substitute therefor a com )lemental frame which is provided with a saddle and steering mechanism and is so constructed as to be readily and rigidly secured to the crank-hanger of the motor frame a.

The complemental frame is rovided with a horizontal bar 7), a brace e ement c, and parallel uprights d and e of suitable tubular material. These uprights are further braced and connected by means of the horizontal cross-bars f, the lower ends of the uprights being connected by means of the inclined bar g which extends into the horizontal portion h, as clearly shown. This bar g is connected to a steering head '5.

j designates an inclined brace-bar extending between the steering right e.

Mounted within the u )right d is a suitable steering-rod or shaft 75 that extends through the steering-head m and the upright d. The details of this-construction are clearly shown in my above referred to UnitedStates Letters Patent No. 842,833 and need not be specifically described herein.

The up er end of the upright e of the complemental frame carries a saddle a mounted on. the post 6 in the usual manner.

A suitable pulley or arm n is mounted on' the lower end of the shaft is for receiving the wire cord 0 that passes under the anti-frietion roller 1) and over the anti-friction roller 1' to another pulley that is mounted on the steering-shaft s of the eompleniental frame and designated at t. The two handle-bars u and Q) can therefore move in unison so that each rider can assist in steering the vehicle when in use.

The bar I) is attached to the crank-hanger portion w of the motor frame by means of the construction shown in Figs. 2 and 3, andis the same construction as that described in detail in Figs. 1, 4, and 5 of my prior patent heretofore referred to.

It will therefore be seen that the tandem or complemental frame can be readily at tached to and removed from the motor frame a of the motor cycle by merely replacing the usual front fork with the steeringshaft k that is mounted in the com lemental frame and attaching the horizonta bar I) to the. crank-hal'iger w.

Referring to the structure shown in Fig. 4

head 'i and up- 1 ger a; can freely move.

v is constantly elevated;

fringe? in which a detailed view of the foot-rest is shown, an designates a plunger reciprocally mounted in the upright e and carries at its upper end a guidingfi'iiston or element y that is secured to the/ lunger r'by means of the 'Into the fowcr end of the upright e is threaded a plug 2 through which the plun- The lower end of the plunger is provided witha head 3 which is :pivotally connected to the foot-lever 4 and is pivotally connected to a depending lu 5 on the horizontal part h at the point 6. he forward end of the lever 4 is rovided with pedals 7. Mounted between t e lug 2 and the piston y is a coiled spring 8 t rat is normally under compression so that the lever 4 v In order to prevent the head 3 from striking the plug 2, 1 place a buffer spring 9 between the lug 2 and the head 3 which will absorb the blow when the foot is removed from the pedals 7, as readily understood.

What I claim, is

1. In combination, a bicycle frame, a complemental frame therefor,a foot-rest forming a part of the complemental frame and ineluding a tubular upright member as e, a horizontal member as h, a piston located in the upright member, a foot-lever pivoted to v the horizontal member, means located between the iston and foot-lever to normally retain said lever in an elevated position, and means to cushion the foot-lever at the limit of its upward movement.

2. In combination, a bicycle frame, a complemental frame therefor, a foot-rest mounted thereon and elastic means for exerting an upward movement on the foot-rest.

-. 3. In combination, a bicycle frame, acornplemental frame, a foot-rest pivoted thereto, and means for cushioning said foot-rest.

4. In combination, a bicycle frame, a complemental frame, a foot-rest pivotally connected thereto, a plunger connected to the foot-rest, and elastic means carried by the plunger whereby an upward movement is 1m parted to the foot-rest, as described.

CARL 0-.HEDSTRGM.

Witnesses:

K. I. CLEMoNs, H. W. BOWEN.

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