Fastener for locking a rotatable part to a shaft
AssigneeITT Industries, Inc.
InventorBertil Carlstrom
Life of this patent
Estimating the term…
Abstract
A device is disclosed for locking a first screw, or other rotatable part, within a cavity in an impeller. The screw incorporates a cavity containing a spring. A second screw is positioned in the head of the first screw in such a way that it may be used to force the spring into resilient cooperation with the surrounding surface. The first screw is locked thereby to the surrounding surface and is prevented from threading-out under certain heavy load conditions. This development is especially useful for locking an impeller to a pump shaft.
Claims6
Fastening means for releasably locking a first rotatable part within the walls of a cylindrical opening in a device comprising:
- a first rotatable part adapted to be positioned within the walls of a substantially smooth-walled cylindrical opening in a power transmitting device,
- a cavity within the first rotatable part,
- said cavity extending through the first rotatable part from a first opening to a second opening in the part to provide a passageway through the part along a diameter of the part,
- resilient means in the form of a curved spring loosely positioned within said cavity and shaped to be removable through one of said openings,
- a threaded opening in said first rotatable part which provides a third opening into said cavity,
- a second rotatable part in threaded engagement within the threaded opening in said first rotatable part,
- said second rotatable part terminating in an end surface integral therewith to engage the resilient means,
- said second rotatable part responding to the application of a rotary force to rotate in said threaded opening and to press said surface against said resilient means,
- said resilient means responding to pressure from said second rotatable part to straighten the curved spring in said cavity causing it to cooperatively engage the substantially smooth walls of the cylindrical opening in the device and thereby enable the first rotatable part to be locked to the device in an arbitrary axial position and an arbitrary turntable position relative to the walls of the opening,
- said second rotatable part being easily turned to release said resilient means and unlock the first rotatable part from the device.
Fastening means for releasably locking a first screw within the walls of a cylindrical opening in an impeller and locking the impeller to a shaft comprising:
- a first screw threaded into a shaft and extending into position within the walls of a substantially smooth-walled cylindrical opening in the impeller,
- a cavity within the first screw,
- said cavity extending through the first screw from a first opening to a second opening in the screw to provide a passageway through the screw along a diameter of the screw,
- a curved spring loosely positioned within said cavity and shaped to be removable through one of said openings,
- a threaded opening in said first screw which provides a third opening into said cavity,
- a second screw in threaded engagement to the threaded opening in said first screw,
- said second screw terminating in a surface integral therewith to engage the curved spring,
- said second screw responding to the application of a rotary force to rotate in said threaded opening and to press said surface against said curved spring,
- said curved spring responding to pressure from said second screw to cooperatively engage the substantially smooth walls of the cylindrical opening in the impeller and thereby enable the first screw to be locked to the impeller in an arbitrary axial position and an arbitrary turnable position relative to the walls of the opening,
- said second screw being easily turned to release said curves spring and unlock the first screw from the impeller.
Dependencies are inferred from the claim text.