Expansible chamber devices – Collapsible chamber wall portion – Wall portion formed of flexible material
Patent
1993-08-06
1995-05-23
Lopez, F. Daniel
Expansible chamber devices
Collapsible chamber wall portion
Wall portion formed of flexible material
92101, 92128, 92129, 92165PR, 92166, 29888042, 29888044, 74422, F01B 1900
Patent
active
054171440
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a power transmission device for linear movements, comprising a principal member which is movable along a displacement path, and a housing, frame or similar which presents bearing means for the movement of the member along the displacement path, at least one guide member arranged to guide the principal member along the displacement path, and at least one power member which is arranged to be able to be activated to apply a force to the principal member so that it moves along its displacement path in the housing guided by the guide member, whereby a portion of the principal member is arranged to output the movement to drive a connected device.
BACKGROUND OF THE INVENTION
Power transmission devices of the type to which the present invention relates are characterized by the fact that they present a power input end and a power output end. Some type of power means, for example for activation by means of a pressure medium or an electric current, is arranged at the power input end. The power which the power means exerts on the power transmission device is transmitted by the device to the power output end for driving, for example, a machine tool, a displacement device or other arrangement which requires a displacement force for its operation. The purpose of the power transmission device is thereby to transmit the power from the power member to the driven device by converting the movement to another relationship between power and displacement than that which the power member can produce and/or controlling the movement or distributing it.
The present case relates to a power transmission device for a preferably linear movement and a reciprocal movement, that is to say not principally a rotating movement. The movement is thus restricted to a certain stroke length or displacement path in a to and fro movement. The term linear is not necessarily to be understood as a movement along a straight line; the movement can also follow a curved line and can even comprise a restricted to and fro rotational movement.
Devices of this type are previously known from many applications. By way of example, such applications include shears for plate and other material, edge-pressing machines, rods for parallel transfer or scraping, and members in automated assembly machines, etc. The knives in cutting machines or the press tool in edge pressing machines can typically be held in a carriage or on arms for parallel oscillatory movement and thereby driven by compressed air or hydraulic cylinders or electromagnets. The latter means accordingly form the power member and the power transmitting device is formed by the carriage or arm system which guides and distributes the force along the entire length of said tool. In certain cases a gear reduction takes place to achieve a greater force at the output device than the power member is capable of developing or, alternatively, an increasing of the movement path with a loss of force exertion.
OBJECT OF THE INVENTION
Power transmission devices of this and other known types are produced as units for a particular field of use and with a particular size. A change of, for example, the cutting length in a cutting device means that for a large change in dimensions not only the knives have to be extended but that the carriage and link system must also be exchanged. Accordingly, the power transmission device cannot be given a unitary structure for a wide field of application, but instead must for the large part be specially constructed for each application.
Solution
The object of the invention is achieved by making the device with the principal member, the guide member and the housing each formed by longitudinally extending sections or profiles of essentially constant cross-section along their lengths, preferably with end pieces arranged at ends of respective profiles, whereby from a basic embodiment, at least with respect to the principal member and housing, the power transmission device can be produced in various lengths by cutting said profiles from
REFERENCES:
patent: 2287179 (1942-06-01), Kocher
patent: 2534436 (1950-12-01), Gibson
patent: 2771850 (1956-11-01), Wheelton
patent: 2919682 (1960-01-01), Sung
patent: 3016884 (1962-01-01), Merriman
patent: 3110270 (1963-11-01), Ingram
patent: 3124078 (1964-03-01), Hardy
patent: 3709098 (1973-01-01), Lloyd
patent: 3815464 (1974-06-01), Frost
patent: 4506578 (1985-03-01), Gaines
Derwent's Abstract No. A86 23 C/04, SU 661 163, publ. week 8004 (Grinig).
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