Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1983-02-01
1986-06-03
Siemens, Terrance L.
Material or article handling
Vertically swinging load support
Shovel or fork type
414722, 414694, 37DIG18, E02F 342
Patent
active
045926964
DESCRIPTION:
BRIEF SUMMARY
This invention relates to material working machines such as excavators, loaders, drills or breakers, and compactors having an implement for working on material in some way. Throughout this specification the term "working" on material is intended to encompass all forms of interaction of a working implement with material being worked on, for example, penetration, compaction, loading and transportation etc. of materials.
Commonly, material working machines comprise a "prime mover", which is some form of powered vehicle, to which is articulated support means carrying a working implement. A system of hydraulically powered rams mounted on booms is used to impart rotational and/or translatory movement to the working implement. Typical examples are back hoes in which the working implement is a bucket used to dig into the ground and towards the prime mover then lift excavated material out of the ground, and front loaders in which the working implement is also a bucket but is arranged to be driven generally horizontally into material then tilted and raised to lift the material collected. In use, such machines, especially earth working machines, may encounter very high resistance at the working implement and in "deadweight" machines this resistance must be overcome using forces generated by the rotational and/or translatory movement of the working implement, the available level of such forces being dependent on the weight of the prime mover, the support means and the working implement and the reach of the working implement. In deadweight back hoes, to achieve the same working capability but a longer reach, for example, it would be necessary to increase the weight of the prime mover to ensure penetration without the prime mover lifting instead. In deadweight front loaders, to achieve greater tractive effort to force the bucket into more resistive loads, it would be necessary to improve ground grip by increased weight of the prime mover and/or resorting to crawler tracks instead of ground wheels.
It is known to vibrate a working implement mounted on a material working machine.
In proposed forms of material working machines utilising vibrating bucket or blade type implements which penetrate the ground, a straight or slightly arcuate linear reciprocating movement is imparted to the portion of the working implement in contact with the material being worked but such "dynamic" arrangements have not in practice proved to be of very great advantage.
Straight reciprocation of a drilling spike is satisfactory for penetration but often the spike becomes wedged in the hole it has drilled.
Road rollers have been vibrated by means of mechanically rotated unbalanced weights but the resultant vibration of the roller is of an uncontrolled form and unsuited to other applications.
The present invention provides a material handling machine having means supporting an implement for working on material, the machine comprising a material working machine having means supporting an implement for working on material, the machine comprising means for vibrating the implement by applying a mechanically predetermined movement to the implement such that, in use, a portion of the implement for engaging material to be worked on describes a closed curve during each cycle of vibration. This form of vibration has the advantage that a higher frequency is obtainable for a given vibratory power input than with linear reciprocation, which wastes power due to the motion being discontinuous.
The resistance presented by the material being worked on is then much more easily overcome enabling the same working capability to be achieved using lighter equipment. Dynamic machines which are cheaper, lighter and have a longer reach can thus perform as well as deadweight machines which are heavier, more expensive and of shorter reach. When using the invention in certain machines, the tractive forces between the prime mover and the ground need not be as great as in deadweight machines which may enable, for example, wheels to be used instead of the crawler treads which wo
REFERENCES:
patent: 1939289 (1933-12-01), Baker
patent: 2986294 (1961-05-01), Granryd
patent: 3443327 (1969-05-01), Martin
patent: 3677426 (1972-07-01), Luck
patent: 3762481 (1973-10-01), Allen et al.
Pulsar International Limited
Siemens Terrance L.
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