Device for controlling crane stop angle
AssigneeD & R Crane, Inc.
InventorsJames Henry Schroeder, Byron R. Patrick
Life of this patent
Estimating the term…
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.
Claims12
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 to the mast at a stop height, the collar having,
- a collar height and a collar width,
- a first collar portion having a first joint end and a first clamp end,
- a second collar portion having a second joint end and a second clamp end,
- a joining plate operable to secure the first joint end to the second joint end about the mast;
- and
- a clamp fastener configured to compress the first clamp end toward the second clamp end and decrease an inner diameter of the device sufficiently to secure the device to the mast;
- and
- one or more stopping tabs enagagable with the collar and adjustable on the collar at one or more points about a circumference of the mast, the stop height placing the one or more stopping tabs in a position configured to interfere with the jib 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:
- determining a stop height on the mast coincident with a portion of the jib;
- securing a collar at the stop height on the mast, the collar configured to be slidably fit around the mast, the collar having,
- a collar height and a collar width,
- a first collar portion having a first joint end and a first clamp end,
- a second collar portion having a second joint end and a second clamp end,
- a joining plate operable to secure the first joint end to the second joint end about the mast, and
- a clamp fastener configured to compress the first clamp end toward the second clamp end and decrease an inner diameter of the device sufficiently to secure the device to the mast;
- engaging one or more stopping tabs with the collar, the sopping tabs being adjustable to one or more points about a circumference of the mast, the stop height placing the one or more stopping tabs in a position configured to interfere with the jib;
- and
- limiting an effective swing angle of the jib based on the one or more points.
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 first collar portion having a first joint end and a first flange end, the first flange end having a first flange disposed orthogonally to the first flange end;
- a second collar portion having a second joint end and a second flange end, the second flange end having a second flange disposed orthogonally to the second flange end, the first collar portion and the second collar portion having a semicircular shape;
- a joining plate engageable with the first joint end and the second joint end wherein the first collar portion and the second collar portion are configured to surround the mast to form a collar when engaged with the joining plate;
- and
- one or more stopping tabs configured to engage with the collar and be adjustably positioned at one or more points around the collar, the one or more stopping tabs being in a position configured to interfere with the jib so as to limit a movement of the jib to an angle determined by the stopping tabs.
Dependencies are inferred from the claim text.