Matches 1 - 50 out of 50


Match Document Document Title
8991626 Portable lifting system  
A portable lifting system includes a moveable base component including a scissors lift assembly, and a crane assembly coupled the movable base component, the crane assembly including a support...
8844738 Foldable lifting apparatus  
The present invention is a self-locking folding crane apparatus that can be installed onto any pivot shaft and held in place by small positioning devices such as clamps, slip-rings, bolts, shaft...
8720127 Retractable column and method of forming  
The present invention is an improved apparatus and method for forming a retractable tower or column. The present invention includes pointed hooks wherein the hooks are attached to each section of...
8684198 Working machine  
A working machine includes a base machine and a working attachment. The working attachment has a base-end boom, a lead-end boom, and an arm. The working machine is collapsible into a triple-folded...
8459477 Hoisting crane and vessel with such a crane  
A hoisting crane with a substantially hollow vertical column with a foot which is or can be fixed to a support, and with a top, an annular bearing structure, which extends around the vertical...
8408329 Piling and drilling rig with foldable deflection apparatus  
The present invention relates to a piling and drilling rig having a leader, a deflection apparatus for the deflection a rope which is pivotally connected to the head of the leader in a manner...
8225559 Retractable column and method of forming  
The present invention is an improved apparatus and method for forming a retractable tower or column. The present invention includes pointed hooks wherein the hooks are attached to each section of...
7921611 Retractable column and method of forming  
The present invention is an improved apparatus and method for forming a retractable tower or column. The present invention includes pointed hooks wherein the hooks are attached to each section of...
7581360 Retractable column and method of forming  
The present invention is an improved apparatus and method for forming a retractable tower or column. The present invention includes pointed hooks wherein the hooks are attached to each section of...
7350770 Air conditioner compressor hoist  
The present invention provides a portable hoist for use by air conditioner mechanics, or others, to lift compressors in and out of HVAC units (or other heavy objects). The hoist has a lifting arm...
7216774 Crane  
The present invention provides a crane where a spreader retainer is disposed on a rear surface of an extreme end of the lowest boom portion used both for a tower boom and a normal boom, a distance...
7093730 Tower crane with collapsible counter-jib  
The auto-erection tower crane possesses a tie-free jib, mounted at the summit of a mast and extended, toward the rear of its connection point to the summit of the mast, by a counter-jib, the end...
6928774 Enveloping body  
The invention relates to a covering body for masts of construction cranes, electricity lines, or the like with an outer covering which is designed to partially or totally encase a mast in the...
6272413 Safety system for boom-equipped vehicle  
While a crawler body 110 is traveling, infrared sensors 144 and an elevational difference calculator 132 incorporated in a controller 130 detects the magnitude of a step present ahead of the...
5431526 Lifting system for transporting vehicle  
A lift mountable in a transporting vehicle for loading and unloading objects such as small motorized carts. The lift includes an adjustable stand and pivotal boom assembly. An electric motor...
5016768 Pickup truck derrick with traveling sheaves  
A portable derrick assembly adapted for mounting on a pickup truck or a trailer, includes a base frame, a derrick tower, a tower erection subassembly, and an elongated boom pivotally mounted on...
4684306 Auxiliary workover rig  
An auxiliary rig is used in combination with a primary drilling or workover rig. The primary drilling rig typically includes an elongated upstanding drill tower, a base and a crown block. The...
4651884 Portable and collapsible derrick structure  
A pickup truck derrick assembly includes a base frame, a derrick A-frame pivotally mounted on the base frame, a derrick frame erection subassembly, a frame support and locking subassembly and a...
4590719 Erection hinge  
An erection hinge for use in erecting columns for open air structures utilizes a mounting plate which removably attaches to the foundation of such structures and which supports an offset hinge....
4381060 Ring supported mobile tower crane  
A ring supported mobile lift crane includes a load carrier and a counterweight carrier in riding contact with the ring and a tower mounted on the carrier for pivotal movement between generally...
4004778 Portable roof winch  
A portable roof winch comprising a collapsible frame that is adjustable to accommodate the slant of a roof, an extensible beam consisting of two telescoping parts one of which is pivotally mounted...
3892316 Crane with folding mast and jib  
A crane of the type having a mast pivoted to a base for movement between a horizontal and vertical position and a jib pivoted to the top end of the mast is provided with a compensation bar to...
3804264 TOWER CRANE WITH ROCKABLE TOP SECTOR  
A tower crane is provided with a sector shaped rocker at the top of the tower boom and with a control cable which winds itself upon and unwinds itself from the arcuate periphery of the rocker...
3803780 FOLDING POLE FOR HIGH FLOOR MAST  
An oil well derrick gin pole has the upper ends of its front legs connected to its rear legs, and sheaves supported by the upper ends of the rear legs to aid in raising a mast hinged to the base...
3797672 APPARATUS ATTACHABLE TO A TRUCK BODY OR THE LIKE FOR USE FOR HOISTING OR LIFTING, OR AS AN ELEVATED SUPPORT  
A unit formed of components which may be shipped in disassembled condition to occupy a minimum of space, yet may be readily assembled and attached to the truck body of a vehicle to provide a...
3687323 TOWER CRANE WITH TELESCOPIC JIB  
This tower crane comprises a mast and a telescopic horizontally extending jib. Said jib is made of two lengths, i.e. a first length connected to the end of the mast and a second length of smaller...
3631988 SELF-PROPELLED CRANE  
A self-propelled crane is provided with a mast pivoted on a rotatable platform for movement between a horizontal and a vertical position. A telescopic jib is pivoted on the mast and the same cable...
3596772 TOWER CRANES  
A slewable tower crane comprises upper and lower hinged mast elements, the lower of which carries a carriage reciprocated by a screw jack. The carriage is connected by rods to a fixed portion of...
3433368 COLLAPSIBLE CRANE  
3367448 Mobile elevator  
3361268 Tower crane  
3357573 Cranes  
3338428 Crane having a principal mast and a pivotable auxiliary jib  
3335876 Collapsible tower crane  
3318463 Heavy hoisting crane  
3306468 Boom and pivotal jib structure  
3285445 Mobile crane having a double-armed jib  
3280519 Slingline arrangement for oil well masts  
3280520 Snubbing apparatus for use with a portable drilling mast  
3252585 Rigging for mobile tower crane having a topping jib-boom  
3246769 Crane  
3198345 Crane  
3194411 Pivoting tower crane  
3189189 Collapsible crane with interiorly housed jib  
3180496 Portable derrick  
3101816 Drilling and servicing mast  
3084806 Tower cranes  
3083837 Crane  
3037641 Tower crane attachment  
2924341 Pulley assembly for cranes  

Matches 1 - 50 out of 50