Excavating – Combined or convertible – Having quick-connect coupling
Patent
1996-08-08
1998-09-08
Melius, Terry Lee
Excavating
Combined or convertible
Having quick-connect coupling
92117R, 92111, 172273, 414723, E02F 396
Patent
active
058027530
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a push-pull assembly and a method for automatic connection of the push-pull coupling of the assembly.
Previously known are pull-push assemblies for attaching scoops, bulldozer blades or other tools on work machines. Generally known is a connecting piece adapted to the work machine and furnished with hooks and a locking device. By means of the hooks the tool can be picked up, for instance, from the ground on fulcrum pins in the work machine, which match with the hooks in the tool and around which the hooks are wound. The connecting piece has also a locking device to secure the tool at least from another spot to the connecting piece. The attachment of a tool is carried out from the work machine cabin.
On using a connecting piece a disadvantage is the fact that the tool must be furnished with counter-pieces matching with the hooks. The connecting piece means increased weight, especially at the head of an excavator boom, and especially a decrease of the breaking strength of the excavator scoop while lengthening the boom arm which lengthens the scoop torque arm.
By means of a push-pull assembly according to this invention, these disadvantages are eliminated.
The advantages of this invention are that the tools can be quite normal scoops, bulldozer blades or percussion devices with usual mounting holes for fulcrum pins. No separate conneting piece is needed that would increase weight and lengthen the boom arm. Further, as by other push-pull means, mountings and tool replacements can be carried out from the work machine cabin. This push-pull assembly allows automatic coupling of pressure connectors and electric connectors.
In the following the invention is disclosed with reference to the enclosed drawing, where
FIG. 1 is a side view of an excavator boom head and a scoop.
FIG. 2 is the inverted image of the details in FIG. 1.
FIG. 3 is a sectional view of a-fulcrum pin assembly.
FIG. 4 is a sectional view of another fulcrum pin assembly embodiment.
FIG. 5 is automatic connection of a pressure connector.
FIG. 6 is a sectional view of a third embodiment of the invention.
FIG. 1 shows the head of an excavator 2 boom to which scoop 9 is attached. Scoop 9 has two attachment lines 17 to which bushings 8 are applied. In the head of boom 2 there is an immobile mounting hole 5 matching with the pins of the assembly of this invention. Further, at the head of boom 2 there is a mobile mounting hole 4, into which the inventional assembly also fits. The mobile joint 4 is in one end of arm 3 and effected by cylinder 1. In addition, the boom 2 has a steering mechanism comprising an arm 7 and hole 6 to control the cylinder 1 head and allowing the scoop 9 greater clearance by means of arm 3.
FIG. 2 shows a boom head 2 in a position from where it is lowered to the attachment line 17 in scoop 9 in order to fit the pins 10 of mounting hole 5 into bushings 8. In the near vicinity of the of bushings 8 there can be control surfaces to facilitate the alignment of boom head and mounting hole 5 with attachment line 17. When the boom head has reached its proper position, the fulcrum pins 10 are pushed out from the mounting hole 5, whereat they are guided into bushings 8 and the tool 9 is locked in the boom head. Then the mounting hole 4 is secured in the same manner to the other scoop bushings 8 in pushing out the corresponding fulcrum pins 10 into the open ends of bushings 8 by means of compressed air or hydraulic pressure. Disconnection of tool is easily carried out simply by pulling in the fulcrum pins 10 by means of compressed air or hydraulic pressure.
FIG. 3 shows a simple example of the push-pull assembly, where fulcrum pins 10 can be moved in and out. Fulcrum pins 10 having collars 10' are bushings moving on a shaft pin 13 supporting them from the inside. The immobility of shaft pin 13 is secured by fixing it by means of a support 14 to an outer bushing 11 that functions as a frame. Support 14 is a ring almost enveloping shaft pin 13 and preventing shaft pin 13 from bending in situations of stress. Pressure w
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Batson Victor
Melius Terry Lee
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