B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
29/27
B23B 31/26 (2006.01) B23B 29/04 (2006.01)
Patent
CA 1263909
TOOL RETENTION MECHANISM Abstract of the Disclosure . A tool retention mechanism is disclosed for clamping a tool holder knob. An elongate rod member is supported lengthwise in a compartment formed within the center of an elongate housing. A knob clamping assembly is mounted on the outer end of the rod member and is constructed of a circular array of claw finger that are spring biased to urge them to move radially inward. A first piston is slideably supported on the actuator rod rearwardly of the claw fingers and has a cylindrical collar portion which sides over the claw fingers to retain them in a knob c1amping position. A second piston is secured to the inner end portion of the actuator rod and slideably supported in the compartment to define a closed chamber with the inner closed end of the compartment. A first set of belleville spring washers is mounted on the actuator rod between the first and second pistons to bias the first piston to the knob holding position, and a second set of belleville washers is coaxislly disposed relative to the first set of belleville washers between an annular shoulder formed in the compartment and the second piston to effect a large force on the actuator rod in a direction towards the closed end of the compartment. A fluid control and is provided for selectively driving the second piston a slight distance to overcome the force exerted by the outer set of belleville washers and to simultaneously drive the first piston inwardly of the compartment and move the cylindrical collar portion inwardly of the claw fingers to free them to open.
512695
Tennerstedt Milton R.
Illinois Tool Works Inc.
Meredith & Finlayson
Tennerstedt Milton R.
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