Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Casters
Patent
1985-07-09
1986-11-04
Goldberg, Howard N.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Casters
16DIG42, 291494A, 291495R, 29431, 29511, 384490, 384504, B60B 3300, B21D 5310, F16C 1902, F16C 3300
Patent
active
046203427
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a National Phase Application corresponding to PCT/DE No. 84.00236 filed Nov. 8, 1984 and based in turn on German National Application P No. 33 41 063 filed Nov. 12, 1983 under the International Convention.
FIELD OF THE INVENTION
The invention relates the manufacture of swivel bearings for swivel casters, which consist of a swivel bearing cup which can be fastened upon the supported structure, with a cylindrical cup wall, and a swivel bearing plate journaled in the swivel bearing cup in a swiveling mode between two rows of anti-friction bearing elements and which can be connected to the caster fork.
BACKGROUND OF THE INVENTION
Known swivel bearings or swivel casters of the above type, e.g. as described in DE-PS No. 16 05 465 or the DE-GM No. 82 28 224, are manufactured by first inserting the swivel bearing plate with the two bearing rows with the anti-friction elements realized as balls, into the essentially cylindrical cup wall which on its one end is bent over inwards, and then welding or in rarer cases riveting the cup to a fastening plate at the bottom of the swivel bearing cup, or to a fastening plate which forms this bottom. Thereafter the swivel bearing cup is frequently subjected to surface finishing such as galvanizing or the like. Experience has shown that the final welding or riveting of the wall of the swivel bearing cup to the bottom of the cup leads not infrequently to an undesired warping of the material, and to a consequent excessive or insufficient bearing play between the swivel bearing cup and the swivel bearing plate. This in turn causes irregular running and rotational stiffness of the swivel bearing, and above all gives rise to irregular and therefore increased loading, with consequent decreased operating life of such swivel bearings. Similar deleterious effects are caused by other surface finishing steps for the swivel bearing cup, whether they include immersion or spraying, upon the running properties of the balls.
OBJECT OF THE INVENTION
The principle object of the invention is to provide a swivel bearing for swivel casters which does not exhibit the above-mentioned disadvantages, but rather can be manufactured without material warpage, with good running properties, and higher loadbearing capability.
SUMMARY OF THE INVENTION
In accordance with the invention, this object is achieved in that the anti-friction elements and the swivel bearing plate are inserted into the swivel bearing cup through an open end thereof and which is initially provided with an entirely cylindrical wall, and that subsequently the cylindrical cup wall is formed (bent) over towards the interior at its free end or mouth. For the invention it is therefore essential that the anti-friction elements, usually bearing balls and the swivel bearing plate be placed in the appropriately preformed swivel bearing cup provided with an entirely cylindrical wall extending axially beyond the row of balls proximal to the mouth, and that only thereafter the cup wall be formed over on its free end. This forming over can be executed in such careful manner by means of appropriate forming-over tools that the correct running play is ensured and the running properties of the swivel bearing are not impaired. In particular, any material warpage due to a welding is avoided. In addition, portions of the swivel bearing cup and also of the swivel bearing plate can be surface finished, e.g. galvanized, before the forming-over operation, since the resulting appearance need is not be affected by the forming-over.
The swivel bearing cup produced in accordance with the invention consists advantageously, in addition to the cylindrical cup wall, of a suitably formed single-piece sheet metal part, where the bottom of the cup may be uninterrupted, or may be provided with a central attachment opening. A swivel bearing cup so constituted is of extremely simple conformation and producibility.
The swivel bearing cup may also consist, in customary manner, of a fastening plate which fo
REFERENCES:
patent: 1403367 (1922-01-01), Whitney
patent: 1421647 (1922-07-01), Wolfs
patent: 1743255 (1930-01-01), Vervoort
patent: 1821642 (1931-09-01), Johnson
patent: 1829862 (1931-11-01), Johnson
patent: 3428378 (1969-02-01), Divine et al.
patent: 4398329 (1983-08-01), Hitchner et al.
Dubno Herbert
Goldberg Howard N.
Haco-Rollen-Vertrieb GmbH & Co. KG
Ross Karl F.
Wallace Ronald S.
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