GB285253A - Improvements in variable throw cranks for pedal cycles - Google Patents
Improvements in variable throw cranks for pedal cyclesInfo
- Publication number
- GB285253A GB285253A GB431127A GB431127A GB285253A GB 285253 A GB285253 A GB 285253A GB 431127 A GB431127 A GB 431127A GB 431127 A GB431127 A GB 431127A GB 285253 A GB285253 A GB 285253A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spring
- link
- lug
- shaft
- casing
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M3/00—Construction of cranks operated by hand or foot
- B62M3/02—Construction of cranks operated by hand or foot of adjustable length
- B62M3/04—Construction of cranks operated by hand or foot of adjustable length automatically adjusting
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Mechanical Operated Clutches (AREA)
Abstract
285,253. Endersen, J. Feb. 16, 1927. Cranks, variable-throw. - In a variable throw cycle crank, the pedal arm is pivoted to the end of a link freely swung on the shaft and is provided with a lateral lug or the like engaging a co-operating projection or recess on a member secured to the shaft, being constrained to take up a position of minimum throw by a spring in compression interposed between the shaft and the pedal arm or the link. In the form shown in Fig. 1, the pedal. arm 6 is pivoted at 7 to a link 5 freely mounted on or adjacent to the boss 22 of a member 1 secured to the shaft 2, a lug 4 on the member 1 and a spring 14 being interposed between other lugs or extensions 12, 15 of these members. When pressure is applied to the crank, the link 5 moves on the shaft and the lug 10 rocks or trips on the lug 4 until the thrust is taken up by the spring, The spring is carried by a rod 13 pivoted to the extension 12 and passing through an adjustable sleeve 16 screwed into the lug 15, the compression being regulated by lock nuts 17, whilst the crank position may be regulated by adjustment of the sleeve. The outer end of the link 5 is carried by a flanged bearing sleeve 18, screwed on to a boss on the arm 6 and locked by a screw stud 20; the inner end is carried by a similar sleeve 21, screwed on to the boss 22 of the member 1. In a modification, Fig. 12, the spring 29 is arranged within a casing 27 secured to the shaft and bears against a facing 30 on the intermediate link 26 to the outer end of which the pedal arm 24 is pivoted at 25 as in the previous form. The. link 26 is freely mounted on a flanged sleeve screwed on to an inner hub 40 of the casing and passes through an enlarged gap in the casing wall, being normally pressed by the spring 29 against an adjustable stop 36. A lug 34 on the pedal arm engages a recess 35 in the casing periphery, rocking therein when pressure is applied to the pedal and causing the link 26 to move within the casing until the thrust is taken up by compression of the spring. The bearing sleeve screwed on to the hub 40 is flanged to hold in place a cover plate for the casing. The minimum crank radius is regulated by adjustment of the screw stop 36 whilst the spring compression may be regulated by the screw 31.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB431127A GB285253A (en) | 1927-02-16 | 1927-02-16 | Improvements in variable throw cranks for pedal cycles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB431127A GB285253A (en) | 1927-02-16 | 1927-02-16 | Improvements in variable throw cranks for pedal cycles |
Publications (1)
Publication Number | Publication Date |
---|---|
GB285253A true GB285253A (en) | 1928-02-16 |
Family
ID=9774765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB431127A Expired GB285253A (en) | 1927-02-16 | 1927-02-16 | Improvements in variable throw cranks for pedal cycles |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB285253A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5060536A (en) * | 1990-03-05 | 1991-10-29 | Boys Donald R | Flexible crank drive |
CN110053699A (en) * | 2019-06-06 | 2019-07-26 | 金洪烈 | A kind of four bar driving mechanisms of the difunctional pedal rod driven of rickshaw |
-
1927
- 1927-02-16 GB GB431127A patent/GB285253A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5060536A (en) * | 1990-03-05 | 1991-10-29 | Boys Donald R | Flexible crank drive |
CN110053699A (en) * | 2019-06-06 | 2019-07-26 | 金洪烈 | A kind of four bar driving mechanisms of the difunctional pedal rod driven of rickshaw |
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