Device for controlling crane stop angle
AssigneeD & R Crane, Inc.
InventorsJames Henry Schroeder, Byron R. Patrick
Life of this patent
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Abstract
This disclosure provides a system and method for limiting a swing angle of a jib crane, the jib crane having a jib rotatably mounted to a mast. The device can have a collar having a collar height and a collar width, the collar being configured to be fit to the mast at a stop height. The device can also have one or more stopping tabs enagagable with the collar and configured to be positioned on the collar at one or more points about a circumference of the mast. The stop height can place the one or more stopping tabs in a position coincident with the jib to interfere with the swing angle of the jib. The method can use the device to limit the angle through which the jibe crane can swing unimpeded.
Claims14
A device for limiting a swing angle of a jib crane, the jib crane having a jib rotatably mounted to a mast, the device comprising:
- a collar configured to be fit around the mast at a stop height, the collar having a plurality of collar apertures disposed radially about an outer face of the collar and extending into the collar;
- and
- one or more stopping tabs having a tab shank and a tab arm extending orthogonally away from the tab shank, the one or more stopping tabs enagagable with the collar via a portion of the plurality of collar apertures and configured to be positioned on the collar at one or more points on the outer face of the collar along a circumference of the mast, the stop height placing the one or more stopping tabs in a position operable to limit the swing angle of the jib.
A method for limiting a swing angle of a jib crane, the jib crane having a jib rotatably mounted to a mast, the method comprising:
- selecting a selected stop height from a plurality of possible stop heights on the mast, the stop height being coincident with a portion of the jib;
- securing a collar at the selected stop height on the mast, the collar configured to be slidably fit around the mast, the collar further having a plurality of collar apertures disposed radially about an outer face of the collar and extending into the collar;
- engaging one or more stopping tabs with the collar at one or more points about a circumference of the mast via a portion of the plurality of collar apertures, the stopping tabs having a tab shank and a tab arm extending orthogonally away from the tab shank, the stop height placing the tab arm of the one or more stopping tabs in a position coincident with the jib;
- and
- limiting an effective swing angle of the jib based on the one or more points.
Dependencies are inferred from the claim text.