Power plants – Pressure fluid source and motor – Ram driven by fluid pumped from reservoir
Patent
1995-07-25
1997-07-15
Nguyen, Hoang
Power plants
Pressure fluid source and motor
Ram driven by fluid pumped from reservoir
91 3, 417186, F16D 3102, F15B 1302
Patent
active
056472102
DESCRIPTION:
BRIEF SUMMARY
This application is a Rule 371 of PCT/SE94/00041, filed on Jan. 21, 1994.
FIELD OF THE INVENTION AND PRIOR ART
This invention is related to a driving device according to the precharacterizing parts of the appending FIGS. 1-3. The driving device according to the invention may be used in any conceivable connections where it is desired to put a working member in motion. Although it can be mentioned as an example that the working arrangement could form a part of machines for splitting wood pieces, more specifically so called fire wood cleaving machines, it can be mentioned as other examples on applications general use as jacks, presses, bending apparatus etc, the working member of course being provided with an arbitrary tool for carrying out the function aimed at.
Fire wood cleaving machines of the kind mentioned in the introduction are known per se. By way of example, reference can be made to WO 92/11 980 (PCT/SE 91/00914), the European patent publication No. 0 051 853, the Swedish publication for inspection No. 7904914-4 (416 903) and the Swedish publication for inspection No. 8304029-5 (453 898).
The two first mentioned publications are particularly interesting in the present connection. The devices more closely described therein suffer from several important disadvantages. One of these disadvantages resides in the need for springs for returning the working member to a starting position, these springs having to be tensioned during the working stroke. Such springs tend to become fatigued with time, which requires exchange of springs. Furthermore, power for tensioning the springs is required during the working stroke, which increases the total power requirement of the working arrangement. Besides it should be pointed out that the need for such springs makes the embodiment complicated and necessitates also as a rule, at least in more simple embodiments, need for an increased length of the working arrangement. Finally, the work in connection with mounting and replacement of such springs is risky since the springs must be applied with some pretensioning.
Another disadvantage with the prior art is that the costs for the driving devices tend to be relatively high. In WO 92/11980 it is intended to use an internal combustion engine combined with a hydraulic pump of the kind normally appearing in hydraulic drive applications. In the European patent publication 0 051 853 it is suggested to use a part of a portable power saw and to combine this power saw part with a hydraulic pump. Such power saws are normally rather costly and will in this intended application require a specially manufactured hydraulic pump or at least a specially manufactured coupling part. Usage of the power saw part for its regular purpose requires dismounting of the hydraulic pump and application of power saw sword, chain etc.
SUMMARY OF THE INVENTION
The present invention aims at reducing the disadvantages discussed hereinabove.
According to a first aspect of the concept of the invention it is intended to provide ways to design the means for returning the working chamber to a starting position without one having to rely on springs or similar elements based upon power accumulation. This aspect of the invention is fulfilled by that primarily shown in FIGS. 1-3, namely an ejector arrangement adapted to achieve evacuation of the working chamber and thereby returning of the working member by creating a negative pressure in the working chamber.
According to a second aspect of the invention it is aimed at providing ways to reduce, to a minimum, the cost of the hydraulic fluid source, the latter at the same time being adapted to easily be used for alternative purposes without requiring substantial dismounting or mounting work. Essential in this connection is, furthermore, that the: hydraulic fluid source aimed at should be relatively widely spread and be possible to purchase at a reasonable price.
This second aspect of the invention is fulfilled by the hydraulic fluid source being constituted by a high pressure washing unit known per se or of an ar
REFERENCES:
patent: 3122039 (1964-02-01), Sowers, III
patent: 3234934 (1966-02-01), Woodward
Derwent's Abstract, No. 91-279891/38, week 9138, Abstract of Su, 1603081 (Sheremet P Z) 30 Oct. 1990.
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