Bearings – Linear bearing – Roller bearing for drawer
Patent
1995-01-18
1996-01-30
Hannon, Thomas R.
Bearings
Linear bearing
Roller bearing for drawer
384 54, A47B 8800
Patent
active
054876109
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a wheel for roller drawer guides for extractable furniture parts, with a wheel body made from a hard plastic of stable shape mounted for rotation on an axle, the wheel body having a circumferential slot or groove in the wheel body with at least one recess, and having a tire of resilient material, preferably an elastomeric plastic, extending slightly beyond the wheel body's circumference, which is injected in fluid form into the slot with the at least one recess and which, in its resilient solid state, fills the slot and the at least one recess.
For some time it has been common practice, in the case of roller drawer guides, to equip the wheels with tires to damp the rumble created when the wheels run on the guide rails and runner rails. These tires were originally made separately in the form of elastic O-rings and mounted on the wheels. These separate tires, however, could stretch in the course of time, slip, and then sometimes jam the drawer guide.
To avoid this disadvantage, German Patent 39 10 934A1 has disclosed a wheel with an integrated tire of resilient material, preferably elastomeric plastic, which is injected in fluid form into recesses provided for this purpose on the wheel, and in its final resilient state the tire is seated on the wheel body such that any loosening or displacement of the tire on the wheel is effectively prevented. In German Patent 39 10 934A1 the configuration of the wheel is made such that the wheel body has a circumferential slot in its rim in which the tire of resilient material protruding slightly beyond the rim of the wheel body is disposed, and that in at least one of the confronting lateral surfaces and/or in the circumferential bottom surface of the slot at least one, preferably several, recesses are provided, in which the material of the tire injected in fluid form and then converted to the resilient state also is fitted, and that furthermore, in a side wall of the slot there is created at least one bore for the injection of the tire material, which terminates at the other end inside of the slot. In the manufacture of this known wheel it is necessary to align precisely the bores for injecting the tire material, and with them the entire injection mold, with the nozzles that inject the tire material. This considerably complicates manufacture.
The present invention is therefore addressed to the problem of improving the known wheel so that the wheel on the one hand and the integrated tire of elastic material on the other can be manufactured as simply and inexpensively as possible in two successive injection molding processes.
Setting out from a wheel of the kind described above, this problem is solved in accordance with the invention in that an annular groove is provided in one lateral surface of the wheel body, and that the recess or recesses for the integrated tire are in the form of at least one passage leading into the annular groove. By providing an annular groove in a lateral surface of the wheel body instead of the injection bores, the tire material can be injected independently of the position of the injection molding mold with respect to the axis of rotation, i.e., the axle. The still fluid tire material then distributes itself from the annular groove through the passage or passages to the circumferential slot whose periphery is closed off during the injection process by a part of the mold which completely surrounds it. Preferably the passage or passages run from the bottom of the circumferential slot.
To enable the still fluid tire material to be distributed as easily as possible, it is expedient to provide several, preferably four, passages between the annular groove and the circumferential slot, and to distribute them so that they run from the slot at equal intervals.
Particularly in case a plurality of passages are provided, they should run in the opening direction of the parts of the wheel body injection molding mold which form the slot, and should be shaped so that they do not have any undercuts interfering with the opening of the di
REFERENCES:
patent: 2873150 (1955-01-01), Hutzelman
patent: 3464744 (1969-09-01), Fall
patent: 4639145 (1987-01-01), Lautenschlager
patent: 5169237 (1992-12-01), Domenig
Hannon Thomas R.
MEPLA-Werke Lautenschlager GmbH & Co. KG
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