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Discontinuous mechanical advantage front shifting for bicycles

A technology for bicycles and transmissions, applied in chain/belt transmissions, transmissions, bicycle accessories, etc., can solve problems such as increasing mechanical benefits

Inactive Publication Date: 2008-01-23
SRAM CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although the above-mentioned manufacturing device provides increased mechanical advantages, this device has some disadvantages

Method used

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  • Discontinuous mechanical advantage front shifting for bicycles
  • Discontinuous mechanical advantage front shifting for bicycles
  • Discontinuous mechanical advantage front shifting for bicycles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032]FIG. 1 is an isometric view of a twisted chain shifter 10 rotatably attached to a handlebar 20 of a bicycle. The cyclist manually turns the handle surface 12 to operate the control wire 86 to move the chain between the sprockets of the derailleur. 2 is a cross-sectional view taken generally along line 2-2 of FIG. The slot 16 turns when the rider turns the handle 12 . The handle 12 rotates about an axis substantially coaxial with the handle 20 axis.

[0033] Figure 3 is an isometric view of a conventional front derailleur. As shown in FIGS. 3 and 7 , operation of the control wire 86 causes the chain guide 80 to push the drive chain 48 between the number of sprockets 40 , 41 , 42 . As described above, the increased input torque normally required to chain shift the drive chain from the middle sprocket to the large sprocket can be eliminated by employing a mechanical advantage variable mechanism within the chain shifter or the front derailleur. Drive chain 48 ( FIG. 7 ) ...

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PUM

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Abstract

A rotatable handgrip twistshifter (10) mountable coaxially about a bicycle handlebar (20) that abruptly or discontinuously increases the mechanical advantage when shifting a front derailleur from a smaller to a larger chainring. A control cable (86) is slidably connected to the handgrip (12) such that during rotation of the handgrip (12) to effect gear shifts from the middle to larger chainrings of a triple chainring crankshaft (40, 41, 42), the cable (86) is abruptly dropped toward the handgrip axis of rotation thereby increasing the mechanical advantage or leverage of the shifter (10). Alternatively, the control cable (86) is slidably connected to the pivot arm (114) of a front derailleur such that during rotation of the handgrip (12) the cable (86) is deflected away from the derailleur pivot axis (207), likewise, increasing the mechanical advantage of the derailleur.

Description

technical field [0001] FIELD OF THE INVENTION This invention relates generally to multi-speed bicycle wire-operated chain shifters and, more particularly, to variable mechanical advantage chain shifters. Background technique [0002] The bicycle chain moving system has an actuating component or a chain moving device that is operatively connected to a corresponding component or a chain moving gear derailleur through an operating steel wire installed in a housing. The rider drives the chain moving device so that the derailleur pushes the drive chain between the different sprockets of the freewheel on the rear derailleur or between the sprockets on the front derailleur to move the chain. The present invention is an improvement in both the chain shifter and the front derailleur. [0003] Bicycle chain moving devices can be broadly divided into rod-type chain moving devices and rotatable torsion-type chain moving devices, which provide different chain moving operations for cycli...

Claims

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Application Information

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IPC IPC(8): F16H7/22B62K23/04B62M9/10B62M9/131B62M9/1342B62M9/137B62M9/138B62M25/02B62M25/04
CPCB62M9/1342B62M25/04B62M9/137B62K23/04B62M9/131Y10T74/20287Y10T74/20438
Inventor B·T·乔丹J·D·奇弗
Owner SRAM CORPORATION