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6848675 |
Electrical hoist drive system
The invention provides a hoist drive system for controlling the position of a hoist platform in a palletizer. In an embodiment of the invention, a hoist drive system comprises two electrical motors...
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6352136 |
Auxiliary safety lift device for elevator
An auxiliary safety lift device for an elevator includes a main elevator power system, a spare electric power system, a secondary motor, a secondary speed reducer, and an electromagnetic clutch....
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6182945 |
Redundant drawworks
A fully redundant drawworks is provided with two complete and totally independent systems for controlling and powering the drum and drum shaft of the drawworks. Each system broadly comprises at...
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4663128 |
Pulling head for a crystal growing furnace
A pulling head adapted for use with a crystal growing furnace and a crystal growing furnace containing such pulling head, which furnace comprises a high and low speed seed lift motor, a seed...
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4625946 |
Hoist having worm safety device
A hoist having a worm safety device in which the worm is continuously meshed with a worm wheel coupled to the drum. The worm is accelerated to a speed greater than that of the worm wheel and at a...
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4579044 |
Two-speed shift valve
A two-speed, pilot-operated selector valve which directs hydraulic fluid to two motor elements with a common output shaft to obtain a high-torque, low-speed mode, or to one motor element, while...
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4448396 |
Heave motion compensation apparatus
A heave motion compensation appartus is used to move a load from a supply ship in heavy seas to a platform on an oil rig. A main load line extending down from a point of a crane boom mounted on the...
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4434972 |
Hoisting winch
The present invention is a hoisting winch that uses two motors, one a low-speed, high-torque hoisting motor and the other a high-speed, low-torque compensation motor. The motor shafts are connected...
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4431037 |
Low particulate liquid filling machine and method
An improved automatic bottle filling apparatus is provided. The apparatus includes a spring loaded back pressure plate which avoids jamming of bottles that are carried by conveyor. A bottle...
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4188790 |
Hydraulic system for operation of a winch
Hydraulic system for operation of a winch, including a hydraulic motor for operation of the winch, a pump for pumping hydraulic oil for operation of the motor, a manoeuvering valve for control of...
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4132387 |
Winding mechanism
Winding mechanism for example for cranes in which a winding drum is rotatable by two motors the first arranged to drive the drum so as to take up any slack rope when operating conditions, for...
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4132322 |
Silo unloader winch drive
A winch with a cable suspending a silo unloader in a silo; the winch having a gear mechanism and an input shaft operating a worm; a reversible motor connected with the input shaft; an incremental...
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4100822 |
Drive system for a moving mechanism
The drive system comprises an annular member carrying first engagement means which couple to second engagement means carried by drive motor means. The drive motor means are effective to rotate the...
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3981485 |
Helicopter transportable drilling rig
A portable drilling rig which may be disassembled into subcomponent packages small enough to be transported to the site by helicopter and quickly reassembled utilizes unique chain drive units,...
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3917230 |
Well drilling control system
A well drilling control system in which the hoist mechanism which supports the drill string and which is also employed to move well bore and well head equipment between a floating barge and the...
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3841507 |
LOAD HANDLING APPARATUS
A log skidder of the type equipped with a boom assembly and a grapple assembly having a pair of arms operable to be closed around the front end of a load of logs or trees. Loop means are associated...
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3836122 |
CABLE WINCH
A three-speed hydraulic winch includes a base, a drum support, a drum shaft mounted on the support, a cable drum rotatable on the drum shaft and means mounting the support on the base for...
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3836121 |
MOTOR-DRIVEN HOIST WITH PROTECTIVE BRAKING SYSTEM
A motor driven hoist especially useful for moving nuclear reactor fuel is described. A principal feature is a positive locking system to prevent load dropping when a malfunction develops. The hoist...
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3698690 |
HYDRAULICALLY OPERATED WINCH
A power-operated winch assembly with multiple power-driven pinion gears meshing with an driving a drive gear coaxial with the winch drum in the assembly. Each of the pinion gears is coupled to a...
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3675900 |
MOTION COMPENSATING HOIST
A motion compensating hoist for moving a load between relatively vertically movable points, in which a cable from a tensioning hoist is interconnected between the two points, and the cable from a...
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3499286 |
CONTROLLABLE HYDRAULIC POWER UNIT
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3477695 |
LIFTING WINCHES
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3467359 |
PORTABLE WINCH
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3390785 |
Crane with twin motor winch
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3381939 |
Hydraulic draw works with automatic power output control
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3294369 |
Variable speed drives
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2939680 |
Balancer lowering assist
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2924121 |
Universal shaft drive compound for rotary drilling rigs
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2868331 |
Lifting appliance
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2827763 |
Hydraulic system
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2795396 |
Automatic feed for cable-tool drills
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2718377 |
Power winch
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2680004 |
Hoist
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2666876 |
Electric motor drive for differential gearing
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2576872 |
Rotary drilling rig
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2567427 |
Skip hoist motor control
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2552705 |
Mining machine feeding mechanism
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2481037 |
Multiple torsion spring
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2462484 |
Skip hoist control
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2443028 |
Control system
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2370855 |
Skip hoist control
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2345662 |
Skip hoist
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2335079 |
Automatic tension hoist equipment
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2321525 |
Electric hoist
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2300343 |
Hoisting mechanism
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2298222 |
Automatic feed for rotary well drills
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2258756 |
Hydraulically controlled brake
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2258307 |
Power transmission
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2254319 |
Power transmission
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2171177 |
Power transmission
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