Electricity: circuit makers and breakers – Fluid pressure – Piston
Patent
1992-06-02
1993-10-26
Tolin, Gerald P.
Electricity: circuit makers and breakers
Fluid pressure
Piston
73745, 91275, 92 5L, 248500, 200 82E, H01H 3538
Patent
active
052568407
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a holding device, which is displaceably mounted on the outside of a fluid pressure cylinder, for a piston position detector, the holder is displaceable and lockable at any desired position on a longitudinal guide on the outside of the cylinder tube.
Such a holding device is previously known from DE-C-3 516 346 (Daimler-Benz AG). This previously known device comprises a bracket like holder with two hook shaped clamping elements, which are jointly displaceable along a tension rod associated with the fluid pressure cylinder. One of the clamping elements is provided with a radially extending holding plate. A casing, incorporating a piston position detector, is detachably mounted to the holding plate by means of two screws. The other clamping element, which is pivotable relative to the first clamping element, is provided, on the one hand, with a fastening screw for application against the tension rod and, on the other hand, with a clamping screw effective between the clamping elements. Upon tightening the clamping screw the two clamping elements pivot in opposite directions, so that the casing and a protruding tongue element of the second clamping element are pressed against the exterior of the cylinder tube under clamping action.
On the basis of the above mentioned prior art and other similar arrangements (U.S. Pat. No. 4,230,023, EP-A-0 125 992 and EP-A-0 309 304) the present invention achieves a simple and reliable holding device, which
includes the least possible number of screws or similar fastening elements;
enables simple detachment of the casing of the piston position detector also when the holder is positioned and fastened in the desired position; and
protects the casing (and thereby the piston position detector) against external influences.
A further object is to assure a fixation without play of the casing to the holding device with reproducable precision, so that the casing, and thereby the piston position detector, is placed in exactly the same position after detachment and remounting, yet another object is to facilitate a protected placing of a signal cable which is connected to the piston position detector, so that the latter is also protected against external influences.
The above stated objects of the invention are achieved with a holder having a U-shaped yoke, into which the casing is at least partly insertable, whereby the casing together with a piston position detector contained therein is protected by the surrounding yoke. Further, only two fastening means are needed. The first fastening means is used for the fixation of the two shank ends of the yoke to the mutually parallel guides. The second fastening means is used for the fixation of the casing in the inserted position in the yoke. It is essential that the casing can be detached from and remounted into the yoke, also when the latter is held in a fixed position by the first fastening means.
According to a preferred embodiment of the invention, the second fastening means includes a (second) fastening screw, which upon insertion of the casing between the shanks of the yoke is inserted transversally between the shanks, and which by means of an elastic sleeve (which is compressed axially and thereby expanded radially) engages between two stop means arranged at a longitudinal distance from each other on the casing.
The invention will be explained in greater detail below with reference to the accompanying drawing.
FIG. 1 is a perspective view of a cylinder tube (the end plates and the piston of the fluid pressure cylinder are not shown) with a holding device according to the invention displaceably arranged on the outside thereof, the holding device being partly cut away to show a casing for a piston position detector inserted therein;
FIG. 2 is a perspective view of the piston position detector casing;
FIG. 3 is a cross-section through the holding device in a vertical plane and through a fastening screw used for fastening said casing; and
FIG. 4 is a cross-section of FIG. 3.
In FIG. 1 is shown a cylinder tube 1 of a flui
REFERENCES:
patent: 4071725 (1978-01-01), Smith
patent: 4086456 (1978-04-01), Bone
patent: 4230023 (1980-10-01), Ward
patent: 4594487 (1986-06-01), Grassl
patent: 4752657 (1988-06-01), Kane
patent: 4800241 (1989-01-01), McNamara
patent: 4898079 (1990-02-01), Combette
AB Mecman
Tolin Gerald P.
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