Importance

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Abstract

A coaxial shaft and housing assembly is adapted to be locked against relative rotation. It comprises a housing or hollow motor shaft (2) having a threaded internal cylindrical surface (5) of a first pitch (m), and a coaxial shaft (10) received in the housing (2) and having an intermediate threaded external portion (10') of the same pitch (m). A plurality of stud pins (7), externally threaded with the same first pitch (m) are positioned between the shaft (10) and the internal surface (5) of the housing (2), which stud pins are in meshing engagement both with the portion (10') of the shaft (10) and the surface (5) of the housing (2). The stud pins (7) are freely rotatably mounted in a carriage (9) mounted for axial translation between the inside of the housing (2) and the shaft (10). One end of the shaft (10) has another threaded portion (11) of a second pitch (n) greater than the first pitch, and is received in a corresponding socket (12) of an arbor (1) fitted in the corresponding end of the housing or hollow motor shaft (2). The corresponding ends of the housing (2) and arbor (1) fitted therein have cooperating friction surfaces (4, 3) such that when the friction surfaces are brought into contact by screwing shaft (10) into socket (12) a further rotation of the shaft (10) will promote, through the different threading pitches (m and n), a tight locking action due to axial translation of the stud pins (7) within the housing (2).

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First Claim