Electricity: transmission to vehicles – Flexible extensions – Reels
Patent
1982-06-18
1984-11-27
Reeves, Robert B.
Electricity: transmission to vehicles
Flexible extensions
Reels
2421073, 339 5RL, 339 8RL, H02G 1102, B65H 7530
Patent
active
044852789
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for automatically winding up an electrical cable for an electrically operable apparatus on a drum by means of a coil spring stressed with the unwinding of the cable. The drum is journalled with its hollow hub in two sleeve bearings of different diameter formed with a pivot spindle fixed on a base plate. Between the bearings, two sliding contact elements comprised of contact rings and contact springs are arranged of which the contact rings are arranged non-rotatably on the pivot spindle and the contact springs are arranged in a contact carrier insertable in a recess in the hub. These types of winding up devices (cable drums) are particularly used with electrical apparatus of all types for the household, for example, vacuum cleaners, kitchen applicances, and the like.
From the DE-AS No. 1,574,391, an installation in the base of a crushing mill is known, by which the cable drum assembled out of two parts, is journalled in two sleeve bearings of different diameter formed with a pivot pin fixed on a base plate of which the sleeve bearing of larger diameter lying above the base plate at the same time forms a thrust bearing. The bearing must accommodate the drum and the cable weight and the contact pressure of two sliding contact elements, the contact rings of which are arranged outside of the drum concentrically on a drum flange. The carrier of the contact springs is a separate intermediate base centered on the pivot pin. The coil spring is arranged inside of the hollow drum hub. The connection cable is led in the hub hollow space and to a screw lock and in the insertion is clamped through pinching between saw teeth formed ribbed walls in pulling relief.
This arrangement is extraordinarily labor intensive as the drum can only be assembled when the leads of the cable are connected in the hub hollow space and the coil spring is installed. As accessories for electrical apparatus in daily use, however, such convenience serving windup devices must be as inexpensive as possible but nevertheless must have the same service life as the apparatus itself. This necessitates a configuration and an assembly technique of as simple as possible construction.
Thus, an apparatus of the above named type has been known from the DE-OS No. 2,756,023, which these conditions should fulfill. In this apparatus, the sliding contact elements are arranged in the hollow drum hub and, also, the outer contact springs are arranged on a contact carrier tangentially slidable in the hub. The coil spring is arranged as a roll band spring on a hub extension outside of the drum in a hollow pocket-like space formed centrally of the base plate. It is coupled with the hub extension through a snap connection that is difficult to access. The drum is protected against axial drawing off of the pivot pin through a rachet wheel, that is pushed on the free end of a trunnion penetrating the hollow pivot pin. The cable, introduced in a channel-formed recess of the hub, is secured against tension by a pinching member screwed laterally on the drum flange. Its leads are, by screw means, connected in the contact springs of the contact elements. One appreciates that the assembly cost is proportionately high.
A further disadvantage is the single sided tangential arrangement of the contact springs, through which the sleeve bearings are loaded with the contact pressure that damagingly increases the friction resistance.
The object of the invention is to so constructively form a windup apparatus of the initially named type that it can be formed out of few parts and these parts can be assembled in the fabrication by means of plug and locking connections through simple sliding movements in the axial and radial directions without the use of tools such as pliers or screwdrivers.
This object is achieved through a construction with the features of claim 1. Refinements of the construction embodiment are the object of the dependent claims.
The particular features result from a fabrication that is simple and feasible with unskilled labor and wi
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Schaller Albert R.
Steiner Dieter J.
Vetter Werner
Hubbuch David F.
Reeves Robert B.
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