US 5,051,018 AGranted

Coupling

AssigneeMetalform Safeset AB

InventorsBo Appell, Curt Falk

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Abstract

A coupling for coupling together two mutually coaxial, rotatable parts, comprising a substantially cylindrical coupling member which is intended to be mounted between the parts to be coupled together and which is expandable both radially outwards and radially inwards so as to exert on the parts a coupling pressure through the intermediary of the coupling member. The coupling member incorporates a pressure chamber which is intended to be supplied with pressure fluid for expansion of the coupling member and which is provided with a pressure relief device which is triggered upon relative rotation of the aforementioned parts. The coupling member is configured to exert a greater coupling force on a first of the aforementioned parts than on the other of these parts, and the pressure relief device is intended to be activated upon relative rotation between the first part and the coupling member, but to permit rotation between the other of the parts and the coupling member.

Claims8

Dependent claims

A coupling for coupling together a first shaft-like part and a second hub-like part that are coaxially and rotatably disposed with respect to one another, comprising:

a substantially cylindrical coupling member circumscribing said first part and disposed between said first and second parts, said coupling member including:
means for expanding said coupling member both radially inwardly and radially outwardly so as to respectively exert an inward force on said first part and an outward force on said second part, one of said inward force and said outward force being greater than the other of said inward force and said outward force such that said coupling member exerts a greater force on one of said first and second parts on the other of said parts;
means for detecting relative rotational motion between said coupling member and said one part and for eliminating said inward and outward forces when motion is detected;
said coupling member being rotatable relative to said other part in response to a torque less than that necessary to produce said relative rotational motion.

1 more element

Dependencies are inferred from the claim text.