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Document Title |
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8141681 |
Tower climbing assist device
A climb assist system is disclosed that dynamically adjust the rate and level of assist of a climber as the climber needs may change over the period of traverse of the ladder. A sensor detects the...
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7798288 |
Climbing aid for ladders
The invention relates to a climbing aid for ladders or the like, comprising an endless traction means running between guide pulleys, from which a person may optionally hang by means of a suspension...
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7281609 |
Elevator inspection safety devices
An elevator car includes a cross-head portion and a balustrade mounted to the cross-head portion. The balustrade is moveable from a retracted position for normal operation of the car to a deployed...
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7004285 |
Load-sensing mechanism for aerial work apparatus
An aerial work apparatus having a boom mounted to a base, a platform attached to the distal end of the boom, a boom mechanism for positioning the platform, a boom control module mounted with...
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6811161 |
Fire engine having extension ladder and lateral stabilizers
A fire engine having an extension ladder mounted thereto, wherein said extension ladder may be rotated through a full 360 degrees while the ladder is fully extended—regardless of the vertical a...
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6405114 |
Aerial work platform boom having ground and platform controls linked by a controller area network
An aerial work platform supported by a riser boom, a telescoping main boom, and a jib boom. Boom movement may be controlled by a platform control module or a ground control module connected to a...
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6357549 |
Guide rail climbing lifting platform and method
A guide rail system is used to erect towers, to place equipment on towers and for maintenance of towers. The guide rail may be added to existing towers, a climbing lifting platform is attached to...
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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...
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5803203 |
Active scaffolding systems
The invention consists of an active scaffolding system adapted to hold a payload, said active scaffolding system comprising: (a) a plurality of adjustable links and rigid links connected by joints;...
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5685392 |
Multiple lift platform with lateral movement
A powered lift platform apparatus is disclosed having a fixed support structure and two independently operable platforms which move in both the vertical and horizontal direction, for use with...
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5605203 |
Automatic foldable emergency ladder system
An automatic foldable emergency ladder system for use in a building having a smoke detecting device includes an inverted L-shaped housing having a horizontal portion and a vertical portion and...
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5337858 |
Safety system for multi-stage lifts
A lift has a base frame supported on a pair of screw jacks and a pair of support legs when a multi-stage mast on the lift is to be raised. The support legs are slide mounted in guides and each is...
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5333544 |
Mobile platform for operators of calenders
A platform at one side of a battery of rolls in a calender can be moved up or down when the rolls are not driven or when a breastwork at the parapet of the platform is moved to a raised position so...
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5203425 |
Personnel lift devices
The present invention provides personnel lift devices that include at least one of six design features. Each of the design features is discussed individually. The lift device includes an operator's...
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5159989 |
Automatic hydraulic leveling system
An automatic leveling system for a four-wheel vehicle system having outrigger assemblies at each of the four corners of the vehicle chassis and in which each outrigger assembly has an outrigger pad...
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5127491 |
Terra firma exterior-mount fire/rescue elevator
A fire/rescue system which overcomes the deficiencies of internal and external fire escapes noted above by providing a plurality of compartments which are mounted to traverse the vertical side...
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5111906 |
Retractable ladder apparatus
A retractable ladder apparatus (30) for access between a lower and an upper floor is provided. A ladder (60) is moved by moving means, which may be a garage door opener (40), between a position of...
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5103934 |
Method and apparatus for providing a fire escape for a multi-story building
An emergency escape system for multistory buildings in which stair units are stored in recesses in the floor of each above grade level of the building. The stair units are released for gravity...
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5098049 |
Balanced supporting arm
The invention relates to a balanced supporting arm, comprising a substantially elongate structural member which is mounted on a supporting assembly for tilting movement and which is provided with...
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4997064 |
Device for automatically securing a climber climbing a wall
This invention relates to a device for automatically securing a climber climbing a wall, wherein it comprises: a shaft guided in rotation, at least one drum comprising a groove for receiving a line...
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4979588 |
Overhead impact sensing system
An electrical deactivation circuit and a two piece overhead guard assembly including two separately movable bar members which extends upward and over the head of an operator located on the upper...
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4919235 |
Fire exit system
A fire escape system is described in which a latched escape door in a building is unlatched by withdrawal of a restraining pin from a latch mechanism, producing automatic opening of the door by any...
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4869341 |
Automatic control of work platforms
This invention relates to the automatic control of work platforms and in particular to a circuit means that provides a safe operation and automatic relevelling of a work platform that is being...
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4821842 |
Security unit for a hanging stage scaffolding
A security unit for a hanging stage scaffolding motorized by two electric winches of which each is supplied through a control circuit, said stage having a platform or gondola directly or indirectly...
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4792015 |
Automatic escape ladder
An automatic escape ladder is set forth for use particularly in multiple unit, multi-level residential dwellings. A compact interfolded ladder is positionable within an associated enclosure wherein...
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4706570 |
Crane with anti-skewing device
A crane with an anti-skewing device comprising a platform suspended under a bridge deck by two end truck assemblies supported by runways on a bridge. Each end truck assembly includes two sets of...
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4690246 |
Articulated work platform with scissors motion
An improved work platform suitable for mounting on a vehicle mounted telescoping boom. The work platform includes a fixed platform section mounted on the tip of the boom in conjunction with a...
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4690247 |
Inspection car for bridge construction of a high level road
The inspection car is intended to inspect the lower side of the bridge construction of a high level road from above the high level road as well as from the ground and it comprises a swingable and...
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4687073 |
Hydraulically elevatable access equipment
Access equipment including a vehicle (10) on which stands a mast (14) movable between horizontal and vertical positions and mounted for rotation about an axis (13). The mast is telescopically...
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4660730 |
Apparatus for controlling movement of valve override control handles
Apparatus for use in supporting a plurality of override control handles of a control valve assembly, the control handles supported for movement in a first direction between engagement and...
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4643273 |
Access equipment
Access equipment of the type comprising a turntable on a mobile base and having a lower boom, at least one upper boom and a platform carried by the upper or uppermost boom has the operation of the...
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4625830 |
Work platform centering apparatus
There is provided an over-translation sensing and centering apparatus for a scissors lift work platform comprising a linear cam arranged with electronic sensing means to detect an out-of-balance...
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4589518 |
Revolving block for high place working vehicle
A revolving block having an inclination correcting mechanism housed therein is adapted to revolvably support a working implement, such as a ladder or boom, mounted on a high place working vehicle.
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4553632 |
Auto-leveled crane boom man baskets
An automatic leveling device for crane boom supported work baskets includes a weighted and damped plumb sensor coupled to a first potentiometer and a second potentiometer for measuring the relative...
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4499971 |
Material handling vehicle having improved chain monitoring
An improved system for monitoring lift chains included within mast assemblies in material handling vehicles disables downward movement of the forks upon detection of a first level of slackness in a...
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4498556 |
Vertically movable, road towable work platform
A road towable platform having a sectional mast for rapid erection at the face of a structure for the performance of work thereon. The platform is vertically driven on the mast by means of dual...
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4467888 |
Work platform for buildings
A work platform for buildings having a guard rail having, at one end, a movable part pivotally mounted for movement about a horizontal axis between a working position and an upright safety position...
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4462484 |
Tension sensing device
A tension sensing device for scaffolds suspended by at least one hoist cable is described. The tension sensing device generally comprises a support structure adapted to be secured to the scaffold...
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4456093 |
Control system for aerial work platform machine and method of controlling an aerial work platform machine
An electronic control system allows control over the safe operation of an aerial work platform machine. The control system uses a firmware programmed digital processor to execute a sequence of...
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4437543 |
Control system for cage supported by articulated boom
A control system for a personnel carrier attached to a boom which is displaceable by pressure fluid. The control system comprises at least one hand operable controlled handle axially rotatable in a...
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4418791 |
Device for enhancing the versatility of cranes or the like
The free end portion of the boom of a crane carries a separable pivot bearing defining a horizontal pivot axis for a second bearing which reciprocably guides an upright column for one or more...
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4412598 |
Personnel transfer apparatus and method
A system is disclosed for safely transferring personnel to and from a sea launch from and to a tanker, a freighter, a bulk carrier, passenger ship or any other vessel or platform relatively larger...
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4369984 |
Passenger vehicle such as a bus having a laterally extending stair assembly
A stair assembly for a passenger vehicle, especially an omnibus, in which the stair assembly is arranged in a lateral access area of the vehicle. The stair assembly comprises a horizontally...
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4280589 |
Elevating device
An elevating device consists of a base frame, usually mounted on running wheels, a turntable on the base frame, a vertical first post on the turntable and first and second arm means mounted on the...
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4252213 |
Lifting system control device
A device for controlling a lifting system, for example a so-called sky-lift, a building construction machine or the like, where the lifting system comprises at least one articulated arm (5,10,11),...
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4237999 |
Automatic anti-tilt device for scaffoldings
This device is associated with a scaffolding suspended from at least two winches and is adapted to automatically control a safety mechanism when the scaffolding is inclined beyond a predetermined...
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4231200 |
Method and apparatus for assembling a portable tower
Method and apparatus for transporting a sectional tower to a selected location and for erecting the tower at the selected location is disclosed. The apparatus includes a mobile trailer bed on which...
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4207965 |
Gliding cars and tracks type high building emergency escaping device
An emergency escaping device of this invention consists of a continuous W shape metallic tracks vertically mounted alongside the outer wall of a building or between buildings. Said tracks having...
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4191301 |
Rotation limiter
A device for limiting the rotation of a member rotatable about an axis extending from a base, while permitting rotation clockwise and counterclockwise through a preselected number of turns. An...
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4185426 |
Extension/elevation intra-action device for aerial lift apparatus
A telescoping boom lift apparatus having a first boom mounted about a first substantially fixed horizontal pivot axis in a mobile base for vertically pivotable movement with respect thereto and...
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