The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 1999
Filed:
Apr. 20, 1998
Frank Schmidt, Schweinfurt, DE;
SRAM Deutschland GmbH, Schweinfurt, DE;
Abstract
A weight-saving crank arm having two spaced-apart connecting members extending between the pedal eye and the hub of the crank arm. The connecting members are preferably arranged at a relatively large angle with respect to each other so as to transmit the wheel-turning torque through a cross section having a large moment of inertia I.sub.z, where z-axis is the axis transverse to the longitudinal axis of the crank arm. So arranged, one connecting member will carry mostly tensile forces and the other connecting member will carry mostly compressive forces during use. Due to this separation of load-carrying functions, structural properties such as, for example, stiffness and strength of the connecting members can be advantageously optimized. For example, each of the connecting members can be precisely and selectively dimensioned such that the tension-carrying member may have a thicker cross section than that of the compression-carrying member since the compressive strength of a material far exceeds the tensile strength of the same material.