Transmission cranks for bicycles

Abstract

The present invention relates to bicycle transmission cranks that extend from the bottom bracket (3), characterised in that the shafts (1) located at the ends of the cranks (2), where the pedals are attached, are offset from one another by an offset angle, such that they are not aligned along the same vertical line.

Description

[0001] DESCRIPTION

[0002] Bicycle transmission cranks

[0003] OBJECT OF THE INVENTION

[0004] The invention, as the title of this specification indicates, establishes a transmission crankset for bicycles. This is an innovation that, within current techniques, offers previously unknown advantages.

[0005] The cranks are arranged on the bottom bracket axle in such a way that there is a slight offset between the axes of each of the cranks where the pedals are arranged, thus avoiding a dead spot.

[0006] TECHNICAL SECTOR

[0007] Therefore, this invention is limited to the sector of manufacturing bicycle parts, specifically within the manufacturing of cranks.

[0008] STATE OF THE ART

[0009] The current bicycle drivetrain consists of the bottom bracket, from which the cranks and pedals emerge. The axle of each pedal is arranged so that they are at the same vertical position, creating a dead center during pedaling rotation. This dead center makes the pedaling motion uneven.

[0010] In order to solve the detailed problems, the current invention is presented.

[0011] The existence of any product with the same technical characteristics as the invention presented here is unknown.

[0012] DESCRIPTION OF THE INVENTION The object of the present invention is the creation of transmission cranks for bicycles that provide a notable innovation within their field of application in the current state of the art, the characterizing details that make it possible being conveniently included in the final claims that accompany this description.

[0013] The transmission cranks of the present invention have a slight offset, which prevents a dead spot during pedaling, thus making better use of the inertia of the pedal stroke.

[0014] When we talk about cranks we are referring to those that emerge from the bottom bracket axle.

[0015] The axles arranged at the end of the cranks, which is where the pedals are fixed, are arranged in such a way that there is an offset angle, not coinciding with the same vertical.

[0016] This means there is no dead spot when pedaling.

[0017] EXPLANATION OF THE FIGURES

[0018] To complete the description being made and in order to help better understand the characteristics of the invention, this descriptive report is attached, as an integral part thereof, with a figure in which, for illustrative and non-limiting purposes, the following has been represented.

[0019] Figure 1 corresponds to a view of the connecting rods where the offset angle between the axes can be seen (1).

[0020] PREFERRED EMBODIMENT OF THE INVENTION

[0021] As can be seen in Figure 1, the cranks (2) emerge from the bottom bracket axle in a first direction and have a break. Thus, between the axes (1) arranged at the end of the cranks (2), where the pedals are fixed, there is an offset angle, not coinciding on the same vertical.

[0022] Typically the offset angle is more than 5 degrees.

[0023] Having sufficiently described the nature of the present invention, as well as the manner of putting it into practice, it is not considered necessary to explain it further so that any expert in the field may understand its scope and the advantages derived from it, stating that, within its essence, it may be put into practice in other embodiments that differ in detail from that indicated by way of example, and to which it will also achieve the protection sought provided that its fundamental principle is not altered, changed or modified.

Claims

CLAIMS 1.- Transmission cranks for bicycles that emerge from the bottom bracket axle (3), characterized in that between the axes (1) arranged at the end of the cranks (2), where the pedals are fixed, there is an offset angle, not coinciding in the same vertical. 2.- Transmission cranks for bicycles, according to claim 1, characterized in that the offset angle is more than 5 degrees.

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