Abstract Collapsible hoisting apparatus comprises an upright member having a shoe at one end and a swivel pin mounted in the shoe and adapted to pivotally seat in a socket. A boom head affixes one end of a boom to the other end of the upright member for rotation from a position in which the boom is parallel to the upright member in the plane of the boom and the upright member to a position in which the boom is at right angles to the upright member in the plane. A trolley device is movably mounted on the boom for movement along the length thereof. A cable winding device is rotatably mounted on the trolley device. A cable having a hook at one end thereof and affixed to the cable winding device at the other end thereof is wound on the cable winding device. A turning device coupled to the cable winding device extends beyond the boom head for selective manual winding and unwinding of the cable.
Collapsible hoisting apparatus, comprising an upright member having a shoe at one end and a swivel pin mounted in the shoe and adapted to pivotally seat in a socket; a boom; a boom head affixing one end of the boom to the other end of the upright member for rotation from a position in which the boom is parallel to the upright member in the plane of the boom and the upright member to a position in which the boom is at right angles to the upright member in said plane; trolley means movably mounted on the boom for movement along the length thereof; cable winding means rotatably mounted on the trolley means; a cable having a hook at one end thereof and affixed to the cable winding means at the other end thereof and wound on the cable winding means; and turning means coupled to the cable winding means and extending beyond the boom head for selective manual winding and unwinding of the cable.
Claim 2
Dependent Claim
165 words
Collapsible hoisting apparatus, comprising an upright member having a shoe at one end and a swivel pin mounted in the shoe and adapted to pivotally seat in a socket; a boom; a boom head affixing one end of the boom to the other end of the upright member for rotation from a position in which the boom is parallel to the upright member in the plane of the boom and the upright member to a position in which the boom is at right angles to the upright member in said plane; trolley means movably mounted on the boom for movement along the length thereof; cable winding means rotatably mounted on the trolley means; a cable having a hook at one end thereof and affixed to the cable winding means at the other end thereof and wound on the cable winding means; and turning means coupled to the cable winding means and extending beyond the boom head for selective manual winding and unwinding of the cable.
Claim 3
Dependent Claim
29 words
Collapsible hoisting apparatus as claimed in claim 1, wherein the boom head includes locking means for releasably locking the boom in position at right angles to the upright member.
Claim 4
Dependent Claim
85 words
Collapsible hoisting apparatus as claimed in claim 1, wherein the shoe affixes the upright member to the swivel pin for rotation from a position in which the upright member is at right angles to the swivel pin in the plane of the upright member and the swivel pin to a position in which the upright member is coaxial with the swivel pin in said plane, and wherein the shoe includes locking means for releasably locking the upright member in position coaxially with the swivel pin.