Chucks or sockets – With fluid-pressure actuator – Socket type
Patent
1989-02-10
1990-08-07
Howell, Daniel
Chucks or sockets
With fluid-pressure actuator
Socket type
279 22, 279 75, B23B 3102
Patent
active
049461796
ABSTRACT:
The invention is a self-gradually locking chuck for drills and similar devices. It is particularly suitable for portable drills in surgical use. The chuck has a cylindrical sleeve that can be fixed axially to the shaft of a drill and predominantly tapering ferrule with lobes. The ferrule can be axially engaged with the sleeve. Means for centering a tool and at least one spring are located within a hollow space in the sleeve. The chuck also has a mounting with a passage and holes for housing jaws. The mounting and the ferrule are axially movable with respect to each other and the sleeve. Jaws, located in the holes and urged toward the axis of the chuck by the lobes, hold a tool that has been inserted between the jaws. The chuck further has an annular ring which can be screwed onto an externally threaded portion of the mounting projecting from the ferrule. The annular ring serves to engage the tool in a locked condition to prevent accidental release of the tool by the chuck.
REFERENCES:
patent: 685677 (1901-10-01), Furbish
patent: 1112349 (1914-09-01), Barnes
patent: 2466315 (1949-04-01), Johansson
patent: 3767218 (1973-10-01), Linthicum et al.
patent: 3816015 (1974-06-01), Bilz et al.
patent: 4171821 (1979-10-01), Miller
patent: 4692073 (1987-09-01), Martindell
patent: 4828277 (1989-05-01), De Bastiani et al.
Aldegheri Roberto
Brivio Lodovico R.
De Bastiani Giovanni
Faccioli Giovanni
Howell Daniel
Orthofix S.r.l.
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