| Patent Number |
Title Of Patent |
Date Issued |
| 5927520 |
Electro-hydraulic operating system for extensible boom crane |
July 27, 1999 |
| An electro-hydraulic operating system for an extensible boom includes one or more hydraulic cylinders for imparting relative motion between the boom sections to retract the boom according to an electronically stored program of sequences of movement and speeds. A source of pressurized hyd |
| 5911239 |
Metering valve |
June 15, 1999 |
| The metering valve includes a housing assembly defining a metering cavity therein. At least one inlet port supplies fluid to be metered to the cavity, and at least one output port outputs metered fluid from the cavity. A valve seat in the cavity is disposed between the input and outp |
| 5884791 |
Telescopic jib for vehicular cranes |
March 23, 1999 |
| A telescopic jib includes a base part, and at least one telescopic part telescoped in the base part. A shift mechanism extends and retracts each telescopic part. The base part and each telescopic part includes an upper semi-box shaped section part, and at least one of the base part and t |
| 5829606 |
Device for guiding a telescopic part for a telescopic boom |
November 3, 1998 |
| A boom collar for an outer telescopic boom section of a telescopic boom includes a tension belt forming at least a bottom surface and first and second curved corner portions of the collar. First and second sliders are disposed in the first and second curved corner portions, respectively, |
| 5731987 |
Telescopic booms |
March 24, 1998 |
| An operating system for telescoping a telescopic boom for a crane, particularly a boom having three or more telescoping sections, enabling the boom to be extended and retracted automatically under load according to a predetermined sequence which optimises the load capacity of the boom |
| 5718345 |
Carrier track system for independent and/or synchronized operation of a multi-section telescopic |
February 17, 1998 |
| A carrier track system for a multi-section telescopic boom structure having a base section, a mid section and a fly section. A pair of flexible tracks carrying flexible hydraulic hoses and electrical cables are positioned within the base and fly sections and are respectively connected be |
| 5704498 |
Transportable crane |
January 6, 1998 |
| A transportable multi-purpose crane includes a platform having outriggers disposed at opposite ends thereof. A turntable is rotatably mounted to the platform between the outriggers on opposite ends of the platform, and has a center axis of rotation. A riser boom, having a first end and a |
| 5632391 |
Weight for a lift-limiting switch |
May 27, 1997 |
| A weight for operating the lift-limiting switch of a crane, especially a telescoping-boom crane, is composed of two identical castings connected together by a hinge at one side and having a lock on the opposite side which, when actuated, holds the two members around the crane cable but |
| 5584356 |
Centerline double riser with single lift cylinder and link for a low profile self propelled aeri |
December 17, 1996 |
| A vehicular low profile, self propelled aerial work platform having an articulated parallelogram boom assembly including a lower boom assembly having pairs of compression and tension arms pivotally connected between a support frame on the vehicle and a floating frame, and an upper boom |
| 5489114 |
Tie rod extendable and retractable telescopic axle assembly |
February 6, 1996 |
| A tie rod extendable and retractable telescopic axle assembly wherein a pair of axle beams are slidably mounted in a box beam integral with a vehicle chassis. Steering linkage and associated wheel assemblies are mounted on the outer ends of the axle beams, and the inner ends of the a |
| 5355970 |
Multicell articulated riser system for a self propelled aerial work platform |
October 18, 1994 |
| An articulated riser system for aerial access equipment wherein a parallelogram linkage is provided by a support frame, a riser frame assembly, and a pair of substantially parallel arms pivotally connected at each end to the support frame and riser frame assembly. The parallel arms a |
| 5249643 |
Vehicular self-propelled aerial work platform and telescoping parallelogram boom therefor |
October 5, 1993 |
| A vehicular self-propelled aerial work platform wherein a lower telescopic boom assembly is connected to a riser frame assembly having an upper telescopic boom assembly also connected thereto. A work platform is connected to the outer end of the upper telescopic boom assembly. Both the |
| 5145029 |
Self-storing maintenance stand for a scissor lift aerial work platform |
September 8, 1992 |
| A self-storing maintenance stand for a scissor lift aerial work platform wherein a pair of arms are freely pivoted on each side of a stack of pivotally connected scissor arms at the medial portion thereof. An arcuate saddle plate is provided on each end of the pair of arms for engaging |
| 5129480 |
Articulated parallelogram boom assembly synchronization device |
July 14, 1992 |
| A synchronization device for an articulated parallelogram boom assembly having a floating frame connected between an upper work platform carrying boom assembly, and a lower vehicle mounted boom assembly. The synchronization device is mounted on the floating frame and includes a slida |
| 5111945 |
Boom extension alignment device |
May 12, 1992 |
| An alignment device on a crane boom having telescopic boom sections and a side stowable boom extension swingable from a stowed position to a working position and connectable to a nose assembly on a boom section by upper and lower clevis connections on each side of the nose assembly. The |
| 5060427 |
Extension and retraction system for four section telescopic boom having simultaneous and equal e |
October 29, 1991 |
| An extension and retraction system for a four section telescopic boom having simultaneous and equal extension and retraction of the telescopic sections, wherein a pair of hydraulic cylinders are mounted exteriorly of the boom for extending and retracting the inner mid section relative to |
| 5021917 |
Control panel power enabling and disabling system for aerial work platforms |
June 4, 1991 |
| A control panel enabling and automatically disabling system is coupled between a source of electrical power and a plurality of motion controls on an aerial work platform. Upon activation of a pushbutton type power enabling switch, power is coupled to all the motion controls for a pre |
| 4979588 |
Overhead impact sensing system |
December 25, 1990 |
| 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 work platform of an aerial work platform. The guard bar members are connected to the frame of |
| 4964778 |
Forklift truck having a telescopic auxiliary boom articulated to a telescopic main boom |
October 23, 1990 |
| A forklift truck having a fork assembly connected to a telescopic auxiliary boom articulated to a telescopic main boom. The telescopic and articulating features of the auxiliary boom in conjunction with the telescopic feature of the main boom increases the range and reach of the fork |
| 4809472 |
Carrier track assembly for extensible and retractable boom machines |
March 7, 1989 |
| A carrier track assembly for extensible and retractable boom machines wherein the carrier track assembly is positioned within the telescopic boom sections and has one end connected to the extension and retraction fluid cylinder in the base boom section and the opposite end connected to |
