Electricity: transmission to vehicles – Flexible extensions – Reels
Reexamination Certificate
1999-06-03
2001-01-30
Basinger, Sherman (Department: 3617)
Electricity: transmission to vehicles
Flexible extensions
Reels
C191S01200C, C191S012400, C242S614000, C242S153000
Reexamination Certificate
active
06179104
ABSTRACT:
BACKGROUND OF THE INVENTION
1. FIELD OF THE INVENTION
The invention relates to a self-winding cable reel having a base plate which receives the cable drum on a bearing spindle.
2. DESCRIPTION OF THE PRIOR ART
A cable reel of this type is known from DE 40 25 409 C1. Here, the cable drum is of multipart design and the arrangement of the functional parts, such as winding spring, brake and slip rings, is complex.
SUMMARY OF THE INVENTION
The object of the invention is a stable and concentrated construction of all the functional parts on a base plate and a contact arrangement comprising a small number of individual parts.
This object is achieved in accordance with the invention in that a circumferential stub of the cable drum projects into a U-shaped channel of the base plate, said channel being formed by a second circumferential wall, a second annular wall and a third circumferential wall, in that a chamber of the base plate adjoins a window of the third circumferential wall and receives a winding spring fastened to the circumferential stub, in that the third circumferential wall has at least one further window, through which a braking roller reaches and bears against the inner surface of the circumferential stub, in that a central annular wall of the base plate receives contact rings and carries the bearing spindle and in that an annular wall of the cable drum carries sliding contacts.
The invention differs from the prior art in that all the functional parts are received by the base plate, the braking forces of the braking roller and the tensile forces of the winding spring being transmitted inside the base plate to a circumferential stub of the cable drum, so that only low moments of force occur in the operation of the cable reel. The arrangement of the contact rings with integrally formed plug pins or flat plugs on the base plate has the advantage that the contact rings can be easily exchanged if another type of connection is required, for example flat plugs of different thickness or made of different material.
Secure reception and retention of the winding spring is obtained in that the winding spring is fastened to a central spindle of the chamber.
Uniform loading of the slip rings is obtained in that the two sliding contacts are of the same design and in that the contact heads of the sliding contacts are approximately diametrically opposite each other.
A stable design of the brake and easy accessibility are achieved in that a radial guide for a braking lever is provided on the side of the base plate opposite the bearing spindle and in that the braking lever has slots oriented symmetrically with respect to the guide for the purpose of guiding a spindle of a braking roller. The brake can be mounted from the free side of the base plate and exchanged at any time. A quick exchange of a defective brake is thus possible.
Easy installation and dismounting of the brake facilitates the exchange thereof in that the braking lever can be pushed into the guide and the base plate in the axial direction and locked by guide fins and catch lugs.
The prestressing of the braking lever into the braking position is ensured in that a compression spring active in the radial direction is supported between the braking lever and a radially oriented stud of the base plate.
Firm holding and travel limitation for the centrifugal weights is achieved in that centrifugal weights guided in radial guides of a flange of the cable drum engage, with slots, over catch elements of the guides.
Simple and reliable strain relief is achieved in that clamping strain relief elements are provided inside the core of the cable drum.
REFERENCES:
patent: 2856470 (1958-10-01), Hyde
patent: 3208121 (1965-09-01), Price
patent: 3657491 (1972-04-01), Ryder et al.
patent: 3680809 (1972-08-01), Blackmer et al.
patent: 5261514 (1993-11-01), Evans
B{umlaut over (u)}ttner Gerhard
Kleindopp G{umlaut over (u)}nther
Steinm{umlaut over (u)}ller Jörg
Atlanta Kabel Steinmuller GmbH + Co. KG
Basinger Sherman
Jules Frantz
Schindler Edwin D.
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