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Class Information
Number: 212/280
Name: Traversing hoists > Having random condition sensor combined with an indicator or alarm or controlling means or disabling means > Boom movement stops responsive to overtravel or proximity to powerline
Description: Subject matter wherein stopping or disabling occurs in response to either (a) the pivotal movement or telescopic extension of a boom* beyond a predetermined limit or (b) the electromagnetic field of an adjacent electrical power transmission wire.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7194358 |
Lift collision avoidance system |
Mar. 20, 2007 |
| 7034669 |
Anti-collision protection system |
Apr. 25, 2006 |
| 6499610 |
Portable hoist system |
Dec. 31, 2002 |
| 6252513 |
Pole alarm system |
Jun. 26, 2001 |
| 6230090 |
Interference prevention system for two-piece boom type hydraulic excavator |
May. 8, 2001 |
| 6170681 |
Swing type machine and method for setting a safe work area and a rated load in same |
Jan. 9, 2001 |
| 6133841 |
Pole alarm system |
Oct. 17, 2000 |
| 6102373 |
Crane swing warning system |
Aug. 15, 2000 |
| 5730305 |
Crane safety apparatus |
Mar. 24, 1998 |
| 5678707 |
Mechanism for rotating a crane turret through a 500.degree. arc |
Oct. 21, 1997 |
| 5676264 |
Hydraulic boom stop |
Oct. 14, 1997 |
| 5490081 |
Working tool operation range limiting apparatus |
Feb. 6, 1996 |
| 5343739 |
Gantry crane collision avoidance device |
Sep. 6, 1994 |
| 5332110 |
Tractor mounted hydraulic pipelayer with side boom |
Jul. 26, 1994 |
| 5211526 |
Mobile crane |
May. 18, 1993 |
| 5198800 |
Alarm system for constructional machine |
Mar. 30, 1993 |
| 5160056 |
Safety device for crane |
Nov. 3, 1992 |
| 5094353 |
Clamping device for crane or the like |
Mar. 10, 1992 |
| 4979588 |
Overhead impact sensing system |
Dec. 25, 1990 |
| 4752012 |
Crane control means employing load sensing devices |
Jun. 21, 1988 |
| 4685860 |
Apparatus for loading a wheelchair or similar object |
Aug. 11, 1987 |
| 4675664 |
Alarm system and method for detecting proximity of an object to electrical power lines |
Jun. 23, 1987 |
| 4660729 |
Method and apparatus for preventing boom overload |
Apr. 28, 1987 |
| 4649375 |
Apparatus for detecting power lines |
Mar. 10, 1987 |
| 4598829 |
Hydraulic circuit for crane |
Jul. 8, 1986 |
| 4589076 |
Method for controlling stretching and contracting operations of telescopic multistage boom |
May. 13, 1986 |
| 4535899 |
Boom warning actuator |
Aug. 20, 1985 |
| 4523686 |
Anti-two block system |
Jun. 18, 1985 |
| 4516117 |
Range controller for continuously monitoring the position of the boom of heavy machinery |
May. 7, 1985 |
| 4498370 |
Power transmission |
Feb. 12, 1985 |
| 4436476 |
Rod device for use as an arm of an excavator |
Mar. 13, 1984 |
| 4424909 |
Crane boom warning actuator |
Jan. 10, 1984 |
| 4236864 |
Safety control system for the boom of a crane |
Dec. 2, 1980 |
| 4141454 |
Crane with "Z" configured boom |
Feb. 27, 1979 |
| 4119212 |
Monitoring the location of a robot hand |
Oct. 10, 1978 |
| 4099628 |
Towing vehicle |
Jul. 11, 1978 |
| 4064997 |
Crane swing safety control |
Dec. 27, 1977 |
| 4044902 |
Aerial lifting equipment |
Aug. 30, 1977 |
| 4030088 |
Vehicle proximity sensing and control system |
Jun. 14, 1977 |
| 3997062 |
Multi-section telescopic jibs |
Dec. 14, 1976 |
| 3993986 |
Device for restricting the operation range of cranes |
Nov. 23, 1976 |
| 3963127 |
Blocking arrangement in hydraulically operated cranes |
Jun. 15, 1976 |
| 3961685 |
Ladder working limit based ladder stopping device for aerial ladder truck |
Jun. 8, 1976 |
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