Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
  • B66C3/14—Grabs opened or closed by driving motors thereon
  • B66C3/16—Grabs opened or closed by driving motors thereon by fluid motors

Definitions

• the present invention relates to a grapple device, preferably designed tobe used iriloading and unloading of goods, such as timber or bulk material.
• Grapple devices for timbe /pulp and bucket devices for pulp material often have different design, although the mechanism performing the opening can be the same for the two devices.
• Timber grapples have during the last 30 years developed from comparatively heavy constru tions towards smaller and lighter constructions where the geometry of grip- and movement of the grapple device all the time has developed to better suit its purpose.
• Sometimes the lifetime of the more complex version of the modern grapple devices has become unacceptably short at the same time as the need for service has increased.
• One explanation to this negative development can probably be found in the choose of just one hydraulic cylinder.
• the main purpose of the present invention is to obtain a grapple device beeing both compact - low construction hight - and per ⁇ forming a very favourable geometry of movement.
• An other purpose of the invention is to obtain a grapple device performing a very favourable geometry of forces.
• Yet an other object of the present invention is to obtain a grapple device combined with a conventional rotator and a crane, which forms very effective device for loading and unloading of pulpwood.
• the figure is a schematic perspective view of a grapple device according to the invention.
• the prongs 1 and 2 are both movably articulated around the shaft 3.
• a knee-joint mechanism 4 and 5 connects the prongs 1 and 2 at both sides of the shaft 3.
• Between the cross-bars 6 and 7 is a double acting hydraulic piston-cylinder device 7.
• the inlet of hydraulic fluid at the +-side of the device provides a powerful and slow closing movement and inlet at the —side provides a faster and less powerful opening movement of the " two prongs.
• a rotator At the upper side of the knee-jointata rotator can be placed.
• the gripping geometry shown by the prongs 1 and 2 is surprisingly favourable.
• the prongs can be opened to an extend where their points will be directed substantially in parallell and downwards. This is of advantage for the ability to from above be able to grip into e.g. a pulpwood stack. When the prongs grip the load, this will at the same time be moved a little bit upwards, which in a favourable way makes it easier for the logs to roll in between the prongs.
• the waist mounting of the hydraulic devices preferably takes place at both sides of the vertical symetrical axis of the grapple device.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Load-Engaging Elements For Cranes (AREA)
• Prostheses (AREA)
• Portable Nailing Machines And Staplers (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20367896

Family Applications (1)

Country Status (5)

Citations (4)

• 1987
  • 1987-03-18 SE SE8701108A patent/SE8701108A0/sv unknown
• 1988
  • 1988-06-16 WO PCT/SE1988/000329 patent/WO1988010231A1/en active Application Filing
  • 1988-06-16 AU AU19591/88A patent/AU1959188A/en not_active Abandoned
• 1989
  • 1989-02-17 FI FI890773A patent/FI890773A0/fi not_active Application Discontinuation
  • 1989-02-21 NO NO89890722A patent/NO890722L/no unknown

Patent Citations (4)

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