GB2252089A - Pivoted rear suspension for a human powered vehicle. - Google Patents

Pivoted rear suspension for a human powered vehicle. Download PDF

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Publication number
GB2252089A
GB2252089A GB9101752A GB9101752A GB2252089A GB 2252089 A GB2252089 A GB 2252089A GB 9101752 A GB9101752 A GB 9101752A GB 9101752 A GB9101752 A GB 9101752A GB 2252089 A GB2252089 A GB 2252089A
Authority
GB
United Kingdom
Prior art keywords
pivot
rear suspension
subframe
powered vehicle
human powered
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9101752A
Other versions
GB9101752D0 (en
Inventor
Stephen Rutherford
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9101752A priority Critical patent/GB2252089A/en
Publication of GB9101752D0 publication Critical patent/GB9101752D0/en
Publication of GB2252089A publication Critical patent/GB2252089A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K25/00—Axle suspensions
    • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
    • B62K25/28—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay
    • B62K25/30—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay pivoted on pedal crank shelf

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)

Abstract

A rear suspension subframe layout for a human powered vehicle having two, three or four wheels, whereby the subframe pivot or pivots, around which the rear wheel and its subframe rotates, is on or between the upper and lower limits of the top run of the transmission system chain, or transmission belt. This directs the force exerted on the chain due to the pedalling action along the connecting arms and straight through the pivot, exerting very little torque on said pivot, reducing the amount of force transferred to the suspension unit(s) and maximising the force which powers the vehicle. <IMAGE>

Description

PIVOTED REAR SUSPENSION FOR A HUMAN POWERED VEHICLE This invention relates to a pivoted rear suspension for a wheeled vehicle.
There are many types of human powered vehicle in existence, many of them simple in design, of two, three and four wheel layout.
These vehicles will become more popular in the future as fossil fuel supplies are depleted.
As more people use them, standards of comfort and convenience will have to improve. Suspension systems will be part of this development. These systems are beginning to appear in the bicycle market, but all the present systems are affected by the power stroke of the rider's cycling action. This either extends or contracts the suspension, hence wasting energy and upsetting the balance of the machine.
The essential technical feature of this invention is the placing of the central axis of the pivot, or pivots, around which the rear wheel and it's subframe(s) rotates, on or between the upper and lower limits of the top run of the transmission system chain, or transmission belt. This directs the force exerted by the chain along the connecting arms and straight through the pivot, exerting very little torque on said pivot, and reducing the amount of force transferred to the suspension unit(s).
Existing similar layouts use a pivot appreciably above or below the upper and lower limits of the top run of the transmission system chain, and this transfers a much bigger proportion of the torque into the pivot, extending or compressing the suspension unit(s), dependant on the position of the pivot.
Two specific embodiments of the invention will now be described by way of example with reference to the accompanying drawing in which:- Figure 1 shows the upper and lower limits of the transmission chain in one specific layout of front and rear sprockets. This is variable obviously, dependant on the size and number of front and rear sprockets fitted to any particular machine. The area this invention designates for the position of the pivot extends forward of the front sprockets and rearward of the rear sprockets.
Figure 2 shows one of many possible interpretations of the invention on a two-wheeled machine. The pivot is between the main frame of the bicycle and the rear wheel.
Figure 3 shows a possible interpretation of the invention on a three or four wheeled vehicle, where the pivot is further back.

Claims (2)

1 A pivoted rear suspension, where the rear wheel(s) is/are carried on a subframe which rotates around a pivot, or pivots, the position of the central axis of said pivot(s) being both below the uppermost limit of the top run of the transmission chain and above the lowest limit of the top run of the transmission chain, when viewed in elevation from the side of the vehicle.
2 A pivoted rear suspension, as claimed in Claim 1, wherein the position of the central axis of said pivot(s) is forward of the front sprocket(s) or rearward of the rear sprockets and is also below the upper limit of the transmission chain and above the lower limit of the transmission chain as described above, when these limit lines are extended forward and backwards beyond the sprockets. (See Figure 1).
GB9101752A 1991-01-26 1991-01-26 Pivoted rear suspension for a human powered vehicle. Withdrawn GB2252089A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9101752A GB2252089A (en) 1991-01-26 1991-01-26 Pivoted rear suspension for a human powered vehicle.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9101752A GB2252089A (en) 1991-01-26 1991-01-26 Pivoted rear suspension for a human powered vehicle.

Publications (2)

Publication Number Publication Date
GB9101752D0 GB9101752D0 (en) 1991-03-13
GB2252089A true GB2252089A (en) 1992-07-29

Family

ID=10689080

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9101752A Withdrawn GB2252089A (en) 1991-01-26 1991-01-26 Pivoted rear suspension for a human powered vehicle.

Country Status (1)

Country Link
GB (1) GB2252089A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5672133A (en) * 1996-10-09 1997-09-30 Eden; Tom Bicycle gearing system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB223559A (en) * 1923-10-18 1925-03-12 Abel Mohin Elastic suspension for the rear fork of a bicycle
GB2067143A (en) * 1979-10-16 1981-07-22 Suzuki Motor Co Suspension device for motorcycle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB223559A (en) * 1923-10-18 1925-03-12 Abel Mohin Elastic suspension for the rear fork of a bicycle
GB2067143A (en) * 1979-10-16 1981-07-22 Suzuki Motor Co Suspension device for motorcycle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5672133A (en) * 1996-10-09 1997-09-30 Eden; Tom Bicycle gearing system

Also Published As

Publication number Publication date
GB9101752D0 (en) 1991-03-13

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)