Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1982-06-23
1985-02-19
Levy, Stuart S.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
188184, B65H 7548, F10D 5900
Patent
active
045000484
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device with a centrifugal brake, in particular for the automatic winding up of an electrical cable for an electrically driven apparatus on a rotatable drum, that is supported with its hub on a pivot spindle standing on a base plate and is braked on the base plate.
Winding up apparatuses of this type (cable drums) serve for the storage of electrical cables, that are only required occasionally and/or in varying length. In most instances of application, one attempts to hold the space requirements for the device as small as possible, particularly if it should be incorporated in electrical apparatus of all types for the household, for example, vacuum cleaners, kitchen appliances, and the like.
The diameter of the drum required for the application determines the minimum space requirements of the device in the rotational plane of the drum. If now the centrifugal weights, are mounted, as is customary, in pockets on the edge of one of the two drum flanges, the base plate must form with a collar overlapping these flanges, the sliding surface for these centrifugal weights (as for example DE-OS No. 2,756,023). This so simply appearing construction has considerable disadvantages: the centrifugal weights have a distinct weight. The base plate with collar increases unnecessarily the dimensions and with the customary embodiment involves, as an injection molded plastic part, an unnecessarily large and thus expensive injection molding. Further it is proportionately labor intensive, as the loose weights must be inserted by hand in the pockets and during the assembly easily drop out of the drum.
As an accessory for electrical apparatus in daily use such convenience serving wind up apparatus must, however, be as inexpensive as possible. This requires a construction for as simple as possible a configuration and fabrication technique.
The invention has as its object to find a centrifugal brake for economical winding up devices of the described type that requires no additional area or space, is simple to manufacture and permits a partial or fully automated assembly of the apparatus parts.
This object is achieved according to the invention under departure from the customary conception of as large as possible movement circle for the braking weights, in the manner that the centrifugal brake is formed as a brake wheel revolving inside a brake collar and supported on a journal pin on the base plate laterally of the pivot spindle, the brake wheel being driven with a high gear ratio from the drum. This gear ratio can, according to the arrangement and dimensions, be selected in the particular between 1:5 and 1:10. The force connection between the drum and braking wheel can be formed as a friction wheel or as a gear drive. In the first instance, the hub of the braking wheel stands in engagement with the hub of the drum or a friction ring on the drum flange, in the latter case as a pinion with a ring gear on the hub or flange. One obtains the largest possible gear ratio if the journal pin of the braking wheel is arranged inside of the friction ring or the ring gear.
As the centrifugal force of a mass proportional to the expression: movement, the arrangement according to the invention, in reference to advantageous material expenditure and costs, delivers a high braking moment with a small friction wheel, that increases with the square of the gear ratio and is proportional to the drum rotational speed. From this an optimal ratio between the gear ratio and centrifugal weights to be selected can be determined.
Preferably the brake wheel has two centrifugal weight segments that are connected through resiliently deflectable webs with its hub as a unitary element and are frictionally applied under the centrifugal force against the brake collar on the base plate.
Without a free running drive, that is ruled out on the basis of cost, the centrifugal force brake of a cable drum both acts in the unwind as well as the windup direction of the cable. Here the embodiment of the brake wheel with resiliently connected centrifugal
REFERENCES:
patent: 2761650 (1956-09-01), Faugier
patent: 2959371 (1960-11-01), Melton
patent: 4270708 (1981-06-01), Vonk
Hannon Thomas R.
Levy Stuart S.
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