Push Button Shift Control for Bicycles and the Like

The instant invention relates generally to shift lever devices and more specifically it relates to a push button shift control for a bicycle and the like.

Numerous shift lever devices have been provided in the prior art that are adapted to be mounted on handle bars and operated therefrom. For example, U.S. Pat. Nos. 4,263,818; 4,325,267 and 4,548,092 all are illustrative of such prior art. While these units may be suitable for the particular purpose to which they address, they would not be as suitable for the purpose of the present invention as hereafter described.

A primary object of the present invention is to provide a push button shift control for a bicycle and the like that will overcome the shortcomings of the prior art devices.

Another object is to provide a push button shift control for a bicycle and the like which contains a plurality of push buttons to move a control cable to operate gears in the bicycle.

An additional object is to provide a push button shift control for a bicycle and the like that is relatively compact in construction and very efficient to use.

A further object is to provide a push button shift control for a bicycle and the like that is simple and easy to use.

A still further object is to provide a push button shift control for a bicycle and the like that is economical in cost to manufacture.

Further objects of the invention will appear as the description proceeds.

To the accomplishment of the above and related objects, this invention may be embodied in the form illustrated in the accompanying drawings, attention being called to the fact, however, that the drawings are illustrative only and that changes may be made in the specific construction illustrated and described within the scope of the appended claims.

The figures in the drawings are briefly described as follows:

FIG. 1 is a side view of a bicycle illustrating the invention installed thereon.

FIG. 2 is a perspective view of the instant invention per se.

FIG. 3 is a cross sectional view taken along line 3--3 in FIG. 1 showing the internal mechanism.

FIG. 4 is a cross sectional view taken along line 4--4 in FIG. 3.

FIG. 5 is a cross sectional view similar to FIG. 3 of a modified form of the invention.

FIG. 6 is a cross sectional view taken along line 6--6 in FIG. 5

Turning now descriptively to the drawings, in which like reference characters denote like elements throughout the several views, FIGS. 1 through 6 illustrate a shift control device 10 for a bicycle 12 having a downtube 14, a control cable 16 and gears 18. The device 10 includes a clamp member 20 attached to the downtube 14 and a housing 22 mounted onto the clamp member 20. Although the instant invention is illustrated attached to the downtube 14 this is a matter of choice and the instant invention 10 might be mounted on the handle bars 66 or any other desirable location that the user might prefer. A plurality of push buttons 24 extends upwardly through top 26 of the housing 22. A mechanism 28 is for locking each of the push buttons 24 in a down position when each of the push buttons is depressed in sequence to move the control cable 16, extending outwardly through side 30 of the housing 22, a predetermined distance back into the housing to operate the gears 18. Another mechanism 32 is provided for releasing the push buttons 24 so that the push buttons and the control cable 16 can return to their previous positions.

Each of the push buttons 24 includes a flat plunger 34 having a side wedge shaped notch 36 therein and a pin 38 extending outwardly from side 40 of the plunger 34 below the notch 36 to engage with the control cable 16.

The locking mechanism 28 includes a plate 42 having a plurality of slots 44 therethrough in different lengths so that each of the plungers 34 of the push buttons 24 can extend through each of the slots 44. First of the slots 44 on the left side of FIG. 4 or the right side of FIG. 6, being the longest in length and last of the slots on the right side of FIG. 4 or the left side in FIG. 6 being the shortest in length. A spring 46 is for biasing the plate 42 to move to one side so that each of the slots 44 will enter each of the notches 36 in each of the push buttons when depressed in a proper sequence.

The releasing mechanism 32 includes a shaft 48 extending from one end 50 of the plate 42 and outwardly from side 30 of the housing 22 oppositely from the notches 36 in the push buttons 24. A release button 52 is affixed to free end of the shaft 48 to be depressed to overcome the spring 46 so that the plate 42 will move to the opposite side allowing the slots 44 to leave the notches 36 in the plungers 34 of push buttons 24.

In FIGS. 3 and 4 the longest slot 44 in the plate 42 is on the left and the shortest slot in the plate is on the right so that the push button 24 on the right must be depressed first in sequence to operate the control device 10. In FIGS. 5 and 6 the longest slot 44 in the plate 42 is on the right and the shortest slot in the plate is on the left so that the push button 24 on the left must be depressed first in sequence to operate the control device 10.

As shown in FIG. 3 the compression spring 46 is positioned between the plate 42 and side 54 of the housing 22 opposite from the release button 52 for biasing the plate. As shown in FIG. 5 the spring 46 is positioned on the shaft 48 between the release button 52 and side 30 of the housing 22 for biasing the plate 42.

In operative use when a push button 24 is depressed some of the slack in internal cable 56 is taken up when pin 38 forces a short length of internal cable 56 to be deformed between pins 60 and thus shortens the effective length of internal cable as is shown in dots by numeral 58. Internal cable 56 is anchored at both ends 62 but is free to slide over pins 60. Each time cable 56 is shortened this in turn causes cable 16 to be drawn additional predetermined length into the housing 22 because pulley 64 is caused to slide to the right.

While certain novel features of this invention have been shown and described and are pointed out in the annexed claims, it will be understood that various omissions, substitutions and changes in the forms and details of the device illustrated and its operation can be made by those skilled in the art without departing from the spirit of the invention.