US 4,232,405 AGranted

Prosthesis joint

AssigneeViennatone Gesellschaft m.b.H.

InventorFranz Janovsky

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Abstract

An artificial elbow joint comprises a detent wheel rotatably mounted on the forearm and fixedly connected to the upper arm, the detent wheel having a periphery defining a series of detent notches and a lug affixed thereto and projecting from the periphery. A latch is slidably mounted in relation to the detent wheel and a spring biases the latch against the detent wheel into a first position wherein the tip of the latch engages a respective detent notch to lock the joint. A cable line is attached to the latch and is operable to move it into a second position wherein the latch tip is disengaged and the joint is unlocked, operation of the cable line pivoting the forearm in relation to the upper arm. A leaf spring having an angularly bent end is displaceable between the notched detent wheel periphery and the latch by the lug to retain the latch in the second position.

Claims4

Dependent claims

A prosthesis joint for the rotatable connection of two prosthesis parts pivotal in relation to each other, which comprises

(a) a detent body rotatably mounted on one of the prosthesis parts and fixedly connected to the other prosthesis part, the detent body having a periphery defining a series of detent notches and a lug affixed thereto and projecting from the periphery,
(b) a latch having a tip, the latch being mounted slidably in relation to the detent body,
(c) a spring biasing the latch against the detent body into a first position wherein the tip of the latch engages a respective one of the detent notches to lock the joint,
(d) a cable line attached to the latch and operable to move the latch against the spring bias into a second position wherein the tip of the latch is disengaged from the one detent notch to unlock the joint, operation of the cable line pivoting the one prosthesis part in relation to the other prosthesis part, and
(e) a stop part including a leaf spring having an angularly bent end displaceable between the notched periphery of the detent body and the latch by the lug to retain the latch in the second position.

2 more elements

Dependencies are inferred from the claim text.