JP2005306346A - Load reducing device for bicycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load reducing device for a bicycle for reducing a stepping load when the bicycle is started. <P>SOLUTION: The load reducing device for the bicycle has two cranks and a slide groove provided so that the two cranks are engaged with each other, and is elongated, variable, and telescopic by detecting the size of a combination load so as to be telescopically moved by connecting the two cranks by the slide groove 3, and by automatically sliding and extending by required quantity with regard to the load. Thus, problems wherein (1) there is trouble due to a large stepping load applied to a pedal when the bicycle is started or climbs a slope and (2) a transmission cannot cope with a sudden large stepping load at the moment when it is applied to the pedal during traveling, are solved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bicycle load reducing device that reduces a stepping load when starting a bicycle.

  Conventionally, when starting a bicycle or climbing a hill, it was difficult to apply a heavy pedal load. Therefore transmissions were developed. However, in a transmission, when a large stepping load is applied to the pedal suddenly during traveling, it cannot respond instantaneously. Moreover, handling is troublesome.

Therefore, there are the following problems.
(B) When starting a bicycle or climbing a hill, it was difficult for the pedal to be heavily depressed.
(B) In the case of a transmission, when a large stepping load was applied to the pedal suddenly during traveling, it was not possible to respond immediately.
The present invention has been made to solve these problems.

Two cranks are provided and slide grooves are provided so that they engage with each other. When the stepping load is small, the pedal-side crank does not slide and the crank rotation radius is small and the momentum is small. When the stepping load is large, the crank senses the magnitude of the load and automatically needs the load. Slide and extend to increase the turning radius of the crank to reduce the stepping load. When the load was applied, the pedal side crank was slid and extended at an early point of stepping, so the crank had a curved shape. When the load is no longer detected, the pedal-side crank that slides and extends is pulled back to its original position by the force of the spring. The crank can be expanded and contracted with respect to the load.
When the present invention is activated, the crank instantly senses the magnitude of the load and automatically slides the required amount when a heavy load is applied to the pedal, such as when starting or climbing, or when the pedal is suddenly depressed. The pedal-side crank is extended and lengthened, the crank rotation radius is increased, and the load is reduced so that the pedal can be moved even if the pedaling force is small. There is a bicycle load reducing device characterized by the above.

  When a heavy load is applied to the pedal, such as when starting or climbing, or even when the load changes suddenly, the crank instantaneously senses the magnitude of the load and automatically slides the required amount against the load. It grows and becomes longer, and the crank radius of rotation is increased to make it easier to move even with little stepping force.

Embodiments of the present invention will be described below.
(A) The crank is divided into a drive gear side crank (1) and a pedal side crank (2), and a slide groove (3) is provided so as to mesh with each other. The slide groove (3) is connected to the drive gear side crank (1). Two cranks of the pedal side crank (2) are combined to form a single crank.
(B) Attach the spring (4) to a part of the crank and slide it back to return the pedal-side crank, which has become longer, to its original position.
(C) When the load was applied, the pedal-side crank was slid and extended at a time when the pedal was pressed early.
The present invention is constructed as described above, and when used, it is assembled and mounted in the same manner as a conventional crank. The bicycle in use can be used by replacing the conventional crank with the load reducing device crank of the present invention. The spring can be mounted inside the slide groove. A set of bicycle load reducing devices is composed of two on the left and right.

  Perspective view of the present invention   Front view of the present invention   The front view which shows the state which the crank of this invention slides and is extended.

Explanation of symbols

1 Drive gear side crank 2 Pedal side crank 3 Slide groove 4 Spring

Claims (2)

A variable stretchable bicycle load reducing device, characterized in that two cranks are provided and slide grooves are provided so as to mesh with each other, and are combined so as to be movable in a stretchable manner. Curved bicycle crank.

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