Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Casters – Locked
Patent
1996-10-29
1998-07-07
Mah, Chuck
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Casters
Locked
B60B 3300
Patent
active
057749361
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a roller, in particular a castor, having a fork carrying the tired wheel and a braking device at least for the rotational movement of the wheel, which braking device has a push-rod displaceable towards the wheel by means of an actuating device, a braking member pressing into the tire, and an energy storage spring interposed between actuating device and braking member.
This type of roller is known from DE-GM 93 07 665. The construction in question seeks to achieve an ABS-style braking system. The aim is therefore to exert a highest possible braking force on the wheel in such a way that blocking just about occurs, while continuing to maintain the wheel slip. Any additional force is diverted into the roller parts. A component of the device in question is a push-rod, displaceable by external force, which has an energy storage spring interposed between an actuating device and braking member or which is itself set up as a push-rod resilient in itself. The braking member, which is pivotally mounted as a double-armed lever in the base of the fork, is provided with an additional spring for the lifting of the braking component. The push-rod is inserted freely from above into the corresponding receiving portion of the roller.
SUMMARY OF THE INVENTION
In view of the above, it is an object of the present invention to providing a roller of this kind in a manner which is more advantageous in use, while achieving a braking device which is less severe on tires.
As a result of the invention, a roller of this kind with increased utility value is achieved: for example, the rapid wear to be observed in the event of unsuitable tolerance pairings and/or incorrect mounting of the wheel may be substantially minimised. In practical terms, it is provided that the characteristic/prestress of the energy storage spring in relation to the pressure resistance of the tire is arranged so that when the actuating device is in the braking position, the braking member maintains but does not exceed a depth of penetration into the tire specified for stopping the rotation of the wheel. Under the normal force conditions, the push-rod operates like a rigid push-rod; it is only in the event of higher braking-related resistance that the desired overload safety arrangement takes effect. The strength of the relatively hard energy storage spring, which by far exceeds the effect of a restoring spring, thereby neutralises a part of the length of the push-rod stroke as set-up, precisely to the extent to prevent damage. In the long term, this brings about a substantial saving of the tire and keeps the actuating forces to be applied within the normal range. Furthermore, it is advantageous from a construction viewpoint for the energy storage spring to be disposed between an externally-controlled plate of the actuating device and a spring-biased slide member, which engages in the energy storage spring and is biased by a second spring in the direction of the plate, which slide member is positioned at the one end of the push-rod. Plate and slide member thus form the support for the energy storage spring, the two-part arrangement being further utilised so that plate and slide member engage against one another before the energy storage spring bottoms, i.e. the turns of the spring close up. This enables exact consideration of the free space required for the respective type and size of roller. For this, an arbor portion of the plate engages in addition into a passage of the slide device. This provide a non-tilting abutment for both of the ends of the energy storage spring. This construction may also be further used to the effect that slide member and arbor portion of the plate are coupled positively in one another. A precise determination of the stop-limited spring path may thereby be achieved by simple means in that the positive coupling is formed by the head of a screw, whose screw-bolt side external edge engages against a shoulder in the passage of the slide member. Finally, it also proves to be a
REFERENCES:
patent: 3988800 (1976-11-01), Sachser
patent: 4815161 (1989-03-01), Timmer et al.
patent: 5377372 (1995-01-01), Rudolf et al.
Farber Martin A.
Mah Chuck
Tente-Rollen GmbH & Co.
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