Machine element or mechanism – Mechanical movements – Grip units and features
Patent
1975-01-03
1976-01-27
Scott, Samuel
Machine element or mechanism
Mechanical movements
Grip units and features
74194, 74212, 280236, 280238, F16H 1504, F16H 1510
Patent
active
039344819
ABSTRACT:
A transmission for a pedal-propelled vehicle has a drive shaft rotated by a crankset and disposed radially with respect to the driving wheel of the vehicle. A friction wheel is slidably connected to the shaft by a one-way clutch and is in engagement with a friction member connected to the driving wheel to rotate therewith. The friction wheel includes a tubular shaft through which the drive shaft extends. A shifting unit is connected to the friction wheel by means of the tubular shaft to slide along the drive shaft therewith but is held against turning. The shifting unit includes a gear train having a pinion in mesh with a fixed rack parallel to the drive shaft. First and second normally inoperative connections between the tubular shaft and the gear train are provided, the first to drive the gear train to rotate the pinion to shift the unit and the friction wheel towards the axis of the friction member and the second to drive the gear train to shift the unit and friction wheel towards the periphery thereof. The connections are made by a control including means responsive to the speed of the tubular shaft and means, adjustable by the operator, resiliently opposing the speed responsive means. When the speed responsive means is dominant, the first connection is rendered operative, when the resilient means is dominant, the second connection is rendered operative, and when neither means is dominant, a neutral is established with neither connection operative, the transmission thereby effecting ratio changes in relation to the wanted rate of pedalling or cadence that is established by the resilient means.
REFERENCES:
patent: 1185616 (1916-06-01), Bjorneby et al.
patent: 1203238 (1916-10-01), Motley et al.
patent: 2956443 (1960-10-01), Nelson
patent: 3863503 (1975-02-01), Loeb et al.
Burke Allan R.
Scott Samuel
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