Combination cylinder and pistons

Expansible chamber devices – Relatively movable working members – First working member moves second coaxial working member...

Reexamination Certificate

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Details

C092S108000

Reexamination Certificate

active

06314862

ABSTRACT:

BACKGROUND OF THE INVENTION
Occasionally, it is desired to increase the piston rod output force in a cylinder while utilizing a single existing power source to the piston. Of particular interest is where the power source is a pneumatic or hydraulic power source. At the present time, this is accomplished by providing a power supply that is exterior to the cylinder body using multiple ports and exhausts mounted thereon. Control valves and manifolds are required in such a structure. Examples of this are shown in U.S. Pat. Nos. 3,288,036 Fisher and 3,880,051 Eppler. Such devices are complex and expensive. Furthermore, for applications such as handheld tools, the outside contour of such devices makes them inapplicable for such use due to external valving and piping. Also, equal force is not provided to all pistons simultaneously.
Attempts have been made to eliminate the complex control valves and manifolds but the results have been complex, expensive multi-piece designs where the pistons are all mounted on one rod and there is an internal manifold. Examples of these are U.S. Pat. Nos. 3,430,539 Freeman; 3,485,141 Ott, et al.; and 3,457,840 Grimes.
BRIEF SUMMARY OF THE INVENTION
Applicant's invention utilizes a plurality of pistons in a single cylinder where the pistons are axially aligned and wherein the actuating pressure is introduced to the cylinder head at one end and is transmitted through an opening in the piston rods to the cylinder head of the next piston and thus, repeatedly conducted through the piston rod of succeeding pistons until the last piston which is not so equipped and which is connected to the tool which is thus actuated by the movement of the pistons.
It is therefore an object of this invention to provide a simple, multiple piston, single cylinder device which may be readily adapted for use as a hand tool for multiplying the force from a single internal power supply.
This, together with other objects of the invention, will become apparent from the following detailed description of the invention and the accompanying drawings.


REFERENCES:
patent: 2896413 (1959-07-01), Hussey
patent: 2983256 (1961-05-01), Seeloff
patent: 3053294 (1962-09-01), Andersson
patent: 3288036 (1966-11-01), Fisher
patent: 3385172 (1968-05-01), Kaminga
patent: 3430539 (1969-03-01), Freeman
patent: 3457840 (1969-07-01), Grimes
patent: 3485141 (1969-12-01), Ott et al.
patent: 3853037 (1974-12-01), Denzler et al.
patent: 3880051 (1975-04-01), Eppler
patent: 3968735 (1976-07-01), Boisde et al.
patent: 4005598 (1977-02-01), Ehmann et al.
patent: 4759260 (1988-07-01), Lew
patent: 4903939 (1990-02-01), Ariizumi et al.
patent: 5191825 (1993-03-01), Beneteau et al.
patent: 5522302 (1996-06-01), Yuda et al.
patent: 5623861 (1997-04-01), Ward et al.

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