GB2326211A - Chain wheel having replaceable toothed ring segments - Google Patents

Abstract

A chain wheel comprises a plurality of separate replaceable toothed ring segments of "T" section securable to a hub member. Each segment has a plurality of cut-out holes to reduce weight and bolt holes for securing it to a hub member.

Description

THE sT' SECTIONED CHAIN-RING The invention described below relates to a modified outer and middle chain-ring split into 5 sections.

The idea for the invention came from loosing or damaging the teeth on the outer and sometimes on the middle chain-ring. Resulting from large obstructing objects getting lodged between the wheels when cycling over rocks or wooden obstructions.

The five sectioned chain-ring means that any damaged sections can easily be replaced without the added cost of replacing a whole new outer or middle chain-ring.

There is the added bonus of a small reduction in the overall weight of the outer and middle chain-rings.

The drawings show the following information: Drawing Number One:- Shows the existing outer chain-ring.

Drawing Number Two:- Shows the modified outer chain-ring.

Finally, drawing Number Three, shows the proposed modifications to the outer chain-ring.

THE 8' SECTIONED CHAIN-RING 1). Drawing Number One shows an existing outer chain-ring with 42 teeth.

2). Drawing Number Two shows the modified outer chain-ring. This is the inventors prototype. The drawing shows each of the five sections: Sections 1, 3 and 4 all have 8 teeth.

Sections 2 and 5 only have 9 teeth.

Making a total of 42 teeth.

3). Drawing Number 3 shows the proposed modified prototype outer chain-ring. There are the addition of three holes in each section. One large hole in the centre of the section and two holes half the size of the central hole positioned ether side of the central hole.

To help reduce the total weight of each section.

4). There is the addition in two smaller Alan bolts holes through the outer, middle chain rings and also through the crank. To secure the sections on to the crank and also to preventing any sideways movement. Therefore reducing any chain slippage as the chain-ring rotates.

Claims (4)

1. The proposed system has various claims. These are listed below: 1). To design and modify an existing outer and middle chain-ring into five sections claiming for Claim 1.

   2). The r shaped sections means that there is a reduction in the amount of stress on each section arm due to gear changes on the chain-rings claiming for Claim
2. 2.

   3). The addition of three holes in each of the sections in the outer and middle chain-ring claiming for claim
3. 3.

   4). The addition of two smaller Alan bolt holes in the outer and middle chain-ring and also in the crank to reduce any sideways movement and therefore making the sections secure on the crank claiming for Claim
4. 4.

   Amendments to the claims have been fled as foHows CLAIMS The proposed system has various claims. These are listed below: 1). To design and modify an existing outer and middle chain-ring into an equal number of sections. The number of sections is determined by the number of arms on the crank claiming for Claim 1.

   2). The r shaped sections means that there is a reduction in the amount of stress on each section arm due to gear changes on the chain-rings claiming for Claim 2.

   3). The addition of three holes in each of the sections in the outer and middle chain-ring claiming for claim 3.

   4). The addition of two smaller Alan bolt holes in the outer and middle chain-ring and also in the crank to reduce any sideways movement and therefore making the sections secure on the crank claiming for Claim 4.