Hoist test stand
AssigneeColumbus McKinnon Corporation
InventorOtmar M. Ulbing
Life of this patent
Estimating the term…
Abstract
A self-contained portable test stand for testing hoists and the like both statically and dynamically. The test stand includes a cantilever beam adapted to support a hoist at one end and a hydraulic cylinder at the other. A variable mechanical advantage force transmitting means which may include a chain and chain block is provided to interconnect the hoist and the cylinder. The hydraulic loading of the cylinder is regulated both by a variable relief valve and a variable pressure and flow hydraulic pump which is controlled by a feedback line responsive to the pressure and flow in the system.
Claims14
A self-contained, portable test apparatus capable of dynamically and statically testing a tensioning, pulling or lifting device, such as a hoist, over a wide range of predetermined loads over a predetermined distance as to a variety of characteristics such as rated load, braking ability the functioning of overload safety mechanisms and generally every in service aspect of all of the operating and load bearing members of the device, said apparatus characterized by including:
- (a) a portable support frame having a horizontally disposed structural beam member from which the device under test may be suspended, said beam member being supported by a vertically disposed column member which in turn is supported at its lower end by a base;
- (b) a controllable variable power means suspended from said beam member for exerting a preselected load throughout the entire length of said predetermined distance;
- and
- (c) means of variable, selectable mechanical advantage adapted to interconnect the device under test and said variable power means for transmitting a tension force therebetween, said tension transmitting means including a tension element, guide means on said base for guiding said element and a reeving device.
A test apparatus for testing a tensioning or lifting device, said apparatus characterized by including:
- (a) a support frame having a structural member from which a tensioning or lifting device may be suspended;
- (b) a controllable variable power means fixed to said frame for exerting a preselected load;
- (c) means adapted to interconnect the suspended device and said variable power means for transmitting a force therebetween;
- and
- (d) said structural member being a horizontally disposed beam supported intermediate its two ends by a vertically disposed column member which is in turn supported at its lower end by a base, said variable power means being supported by said beam on one side of said vertically disposed member, the other end of said beam being adapted to support the tensioning or lifting device to be tested.
Dependencies are inferred from the claim text.