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US 5,848,781 AGranted
Balancing hoist braking system
AssigneeIngersoll-Rand Company
InventorsJoseph A. Kulhavy, Timothy G. Wamboldt
Life of this patent
Estimating the term…
Abstract
A pneumatically operated balancing hoist includes a housing forming a gas chamber, an inlet for communicating with the gas chamber, a sliding piston, and a rotatable longitudinally movable cable drum. The rotatable longitudinally movable cable drum contains one or more longitudinal openings which slidably accommodate drive rods. The drive rods impart the rotation of the cable drum to a flywheel. Exterior to the flywheel are rotating brake shoes which contact a stationary braking surface when the rotation of the longitudinally movable cable drum exceeds a predetermined angular acceleration. A conically shaped brake system attached to the flywheel is mechanically engaged to prevent rotation of the cable drum until pressurized gas is supplied to the chamber.
Claims10
A balancing hoist for raising and lowering loads comprising:
- a hollow housing and two end walls forming a chamber, said housing further including an inlet for the passage of pressurized gas into said chamber;
- a piston slidably positioned within said chamber;
- a rotatable cable drum located within said housing, said rotatable cable drum being movable longitudinally within said housing together with said piston, said rotatable cable drum containing at least one longitudinal opening;
- stationary means within said housing for rotatably supporting said rotatable cable drum, said rotatable cable drum being caused to rotate when said piston and said rotatable cable drum are moved together longitudinally within said housing;
- a cable affixed to said rotatable cable drum such that said cable is wound and unwound about said rotatable cable drum when raising and lowering loads;
- at least one rod means which slidably and longitudinally engages said rotatable cable drum through said at least one longitudinal opening;
- a flywheel fixedly connected to said at least one rod means and adjacent to one of said end walls, said flywheel being coaxial with said means for rotatably supporting said rotatable cable drum;
- a braking mechanism mounted on said flywheel, said braking mechanism being activated when the rotation of said rotatable cable drum exceeds a predetermined speed said braking mechanism will stop the rotation of said rotatable cable drum;
- and
- mechanical locking means mounted on said flywheel, said mechanical locking means being activated when the passage of pressurized gas into said chamber is interrupted.
7 more elements
A balancing hoist for raising and lowering loads comprising:
- a housing forming a chamber, said housing further including a manifold for the passage of pressured gas into said chamber;
- a piston slidably positioned within said chamber, said piston being movable within said chamber in response to the pressurized gas in response to said pressurized gas within said chamber;
- a rotatable cable drum located within said housing, said rotatable cable drum being movable longitudinally within said housing together with said piston, said rotatable cable drum containing at least one longitudinal opening;
- a stationary ball screw mounted axially within said housing, said stationary ball screw rotatably supporting said rotatable cable drum, said rotatable cable drum being caused to rotate by threadable engagement with said stationary ball screw when said piston and said cable drum are moved together longitudinally within said housing;
- a cable affixed to said rotatable cable drum such that said cable is wound and unwound about said rotatable cable drum when raising and lowering loads;
- at least one rod means slidably engaging said rotatable cable drum, said at least one rod means longitudinally aligned with said stationary ball screw;
- a flywheel fixedly connected to said at least one rod means and concentrically aligned with said stationary ball screw;
- at least one brake shoe pivotably mounted to said flywheel;
- and
- a spring mounted on said flywheel and connected to said at least one brake shoe such that said spring restrains said at least one brake shoe against outward radial movement outward until the rotational speed of said rotatable cable drum exceeds a predetermined speed;
- a braking surface within said housing for contacting with said at least one brake shoe;
- mechanical locking means mounted on said flywheel, said mechanical locking means being activated when the passage of pressurized gas into said chamber is interrupted.
9 more elements
A balancing hoist for raising and lowering loads comprising:
- a hollow housing and two end walls forming a chamber, said chamber further including an inlet for the passage of pressurized gas into said chamber;
- a piston movable by said pressurized gas slidably positioned within said chamber;
- a rotatable cable drum located within said housing, said rotatable cable drum being movable longitudinally within said housing together with said piston, said rotatable cable drum containing at least one longitudinal opening;
- stationary means within said housing for rotatably supporting said rotatable cable drum, said rotatable cable drum being caused to rotate when said piston and said cable drum are moved together longitudinally within said housing;
- a cable affixed to said rotatable cable drum such that said cable is wound and unwound about said rotatable cable drum when raising and lowering loads;
- at least one rod means which slidably and longitudinally engages said rotatable cable drum through at least one longitudinal opening;
- a flywheel fixedly connected to said at least one rod means and adjacent to one of said end walls, said flywheel being coaxial and with said means for rotatably supporting said rotatable cable drum;
- a braking mechanism mounted on said flywheel such that when the rotation of the cable drum exceeds a predetermined speed, said braking mechanism will stop the rotation of said rotatable cable drum;
- a brake disc having a plurality of detent holes formed therein mounted adjacent to said flywheel;
- a spring activated detent pin constructed and arranged to pass through one of said detent holes in the event of an interruption in the passage of pressurized gas into said chamber.
7 more elements
A balancing hoist for raising and lowering loads comprising:
- a housing forming a chamber, said housing further including a manifold for the passage of pressurized gas into said chamber.
- a piston movable by said pressurized gas, said piston slidably positioned within said chamber;
- a rotatable cable drum located within said housing, said rotatable cable drum being movable longitudinally within said housing together with said piston, said rotatable cable drum containing at least one longitudinal opening;
- a stationary ball screw mounted axially within said housing, said stationary ball screw rotatably supporting said rotatable cable drum, said rotatable cable drum being caused to rotate by threadable engagement with said stationary ball screw when said piston and said rotatable cable drum are moved together longitudinally within said housing;
- a cable affixed to said rotatable cable drum such that when said cable is wound and unwound about said rotatable cable drum when raising and lowering loads;
- at least one rod means slidably engaging said rotatable cable drum, said at least one rod means longitudinally aligned with said stationary ball screw;
- a flywheel fixedly connected to said at least one rod means, said flywheel being concentrically aligned with said stationary ball screw;
- at least one brake shoe pivotably mounted to said flywheel;
- a spring mounted on said flywheel and connected to said at least one brake shoe such that said spring restrains said at least one brake shoe against outward radial movement outward until the rotational speed of said rotatable cable drum exceeds a predetermined speed;
- a braking surface within said housing for contacting with said at least one brake shoe;
- a brake disc having a plurality of detent holes form therein mounted adjacent to said flywheel;
- a spring activated detent pin constructed and arranged to pass through one of said detent holes in the event of an interruption in the passage of pressurized gas into said chamber.
9 more elements
Dependencies are inferred from the claim text.