US 4,840,085 AGranted

Pedal for a bicycle

AssigneeShimano Industrial Company Limited

InventorMasashi Nagano

Life of this patent

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Abstract

A pedal for a bicycle is provided in which an utmost end portion or free end of a cantilevered pedal shaft has a reduced diameter and a pair of first and second ball bearings are provided between the utmost end of the pedal shaft and the pedal body. As a result of this structure, the pedal body can be made with a smaller thickness in comparison with conventional pedal bodies which are provided at the base or fixed side of the cantilevered pedal shaft with the first ball bearing.

Claims4

Dependent claims

A bicycle pedal to be supported to a crank arm of a bicycle, comprising:

(a) a pedal shaft including a base adapted to be mounted on said crank arm, an utmost end portion, and an intermediate shaft portion between said base and said utmost end portion, said utmost end portion having a smaller diameter than a diameter of said base,
(b) a pedal body suported rotatably relative to said pedal shaft, said pedal body having a first foot bearing surface on one side thereof and a second foot bearing surface at another side thereof which are positioned radially outwardly of said intermediate shaft portion and said outmost end portion,
(c) a ball bearing means for supporting said pedal body rotatably relative to said pedal shaft and comprising a first ball bearing means and a second ball bearing means provided between said pedal body and said utmost end portion at a position located at said utmost end portion spaced from an axial center position of a portion of said pedal shaft which includes said intermediate shaft portion and said utmost end portion, said first ball bearing means and said second ball bearing means being axially spaced apart and located at a position adjacent a longitudinal utmost end portion of said pedal body;
and
(d) a bush formed of light metal or synthetic resin and provided between a longitudinal root end portion of said pedal body and said intermediate shaft portion at a side of said intermediate shaft portion adjacent said base, said bush comprising means for enabling said pedal body at a side thereof adjacent said base to be supported through said bush which in turn is supported by said pedal shaft when said pedal body bends radially of said pedal shaft, wherein a gap is defined between said pedal body and said intermediate shaft portion, said gap enabling said pedal body to rotate freely relative to said pedal shaft during use without contacting said pedal shaft when said pedal body bends radially of said pedal shaft responsive to a treading force applied to one of said first foot bearing surface and said second foot bearing surface, said bush having a length such that it does not extend into said gap.

2 more elements

Dependencies are inferred from the claim text.

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Abstract

A bicycle pedal to be supported to a crank arm of a bicycle, comprising:

(a) a pedal shaft including a base adapted to be mounted on said crank arm, an utmost end portion, and an intermediate shaft portion between said base and said utmost end portion, said utmost end portion having a smaller diameter than a diameter of said base,
(b) a pedal body suported rotatably relative to said pedal shaft, said pedal body having a first foot bearing surface on one side thereof and a second foot bearing surface at another side thereof which are positioned radially outwardly of said intermediate shaft portion and said outmost end portion,
(c) a ball bearing means for supporting said pedal body rotatably relative to said pedal shaft and comprising a first ball bearing means and a second ball bearing means provided between said pedal body and said utmost end portion at a position located at said utmost end portion spaced from an axial center position of a portion of said pedal shaft which includes said intermediate shaft portion and said utmost end portion, said first ball bearing means and said second ball bearing means being axially spaced apart and located at a position adjacent a longitudinal utmost end portion of said pedal body;
and
(d) a bush formed of light metal or synthetic resin and provided between a longitudinal root end portion of said pedal body and said intermediate shaft portion at a side of said intermediate shaft portion adjacent said base, said bush comprising means for enabling said pedal body at a side thereof adjacent said base to be supported through said bush which in turn is supported by said pedal shaft when said pedal body bends radially of said pedal shaft, wherein a gap is defined between said pedal body and said intermediate shaft portion, said gap enabling said pedal body to rotate freely relative to said pedal shaft during use without contacting said pedal shaft when said pedal body bends radially of said pedal shaft responsive to a treading force applied to one of said first foot bearing surface and said second foot bearing surface, said bush having a length such that it does not extend into said gap.

2 more elements