Connection unit of a chain
OwnerWen-Pin Wanginventor
Life of this patent
Estimating the term…
Abstract
A connection unit of a chain includes two outer link plates each having a first hole and a second hole. The second hole has a first recess and a second recess which communicates with the first recess. The first recess has a diameter larger than that of the second recess. The second recess includes an inner surface and a stepped engaging surface which is perpendicular to the inner surface. A stop surface is perpendicularly connected to the engaging surface. At least one first protrusion extends from the inner surface. A pin is securely fixed in the first hole and includes an engaging portion. A neck is located beside the engaging portion and has a diameter smaller than that of the engaging portion.
Claims14
A connection unit of a chain, comprising:
- two outer link plates each having a first hole and a second hole, the second hole having a first recess and a second recess which communicates with the first recess, the first recess having a diameter larger a diameter of the second recess, the second recess including:
- an inner surface and a stepped engaging surface which is perpendicular to the inner surface;
- a stop surface perpendicularly extending from the engaging surface;
- and
- a combined conjunction surface formed at an intersection of a contact line of each of said first and second recesses, said combined conjunction surface forming a first conjunction surface extending from said contact line of said first recess to a second conjunction surface inclined with respect to said first conjunction surface and extending to a first protrusion, said first protrusion extending from the inner surface;
- a pin fixed in the first hole and including an engaging portion;
- and
- a neck located beside the engaging portion and having a diameter smaller than a diameter of the engaging portion.
Dependencies are inferred from the claim text.