U.S. patent number 3,870,133 [Application Number 05/395,555] was granted by the patent office on 1975-03-11 for cable drums.
Invention is credited to Hugo Brennenstuhl.
United States Patent |
3,870,133 |
Brennenstuhl |
March 11, 1975 |
CABLE DRUMS
Abstract
A cable drum comprising a carrier, a drum body for taking an
extension cable and having a cylindrical part with first and second
axially spaced end walls, and a plug base having at least one
socket connected electrically with an extension cable, the drum
body incorporating a holder for a lamp and a switch enabling
electrical connection to be established between the lamp and the
extension cable.
Inventors: |
Brennenstuhl; Hugo
(Tubingen-Prondorf, DT) |
Family
ID: |
6632599 |
Appl.
No.: |
05/395,555 |
Filed: |
September 10, 1973 |
Foreign Application Priority Data
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Sep 10, 1972 [DT] |
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7233401[U] |
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Current U.S.
Class: |
191/12.2R;
191/12.4 |
Current CPC
Class: |
H02G
11/02 (20130101) |
Current International
Class: |
H02G
11/00 (20060101); H02G 11/02 (20060101); H02g
011/00 () |
Field of
Search: |
;191/12.2R,12.4
;242/77 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: King; Lloyd L.
Assistant Examiner: Keen; D. W.
Claims
I claim:
1. A cable drum, particularly for household, workshops, building
sites and the like, comprising a carrier, a drum body for taking an
extension cable containing a cylindrical part with a first and
second end wall on its axial ends and with a plug base having at
least one socket connected electrically with an extension cable in
which the drum body has a holder and a lamp and a switch for the
electrical connection between the lamp and the extension cable, and
in which the switch is arranged in the region of the plug base on
the first end wall and the holder and lamp is placed in a central
opening in the second end wall opposite to the first end wall.
2. A cable drum according to claim 1 in which the lamp is covered
with a cover of translucent material which is connected with the
second end wall for example by means of a screw or snap
connection.
3. A cable drum according to claim 2 in which between the inner
space of the cover containing the lamp and the second end wall a
heat insulating plate is arranged.
4. A cable drum according to claim 2 in which the cover is
connected so as to rotate with the holder and the holder is
arranged to rotate in the second end wall, a rotation of the cover
and thus of the holder causing operation of the switch.
5. A cable drum according to claim 2 in which the second end
surface contains an annular groove in which the edge of the cover
fits and there is at least one hole in the second end surface in a
radial direction from the periphery of the second end surface into
the annular groove, a screw being screwed into this in such a way
that the end of the screw abuts against the edge of the cover.
6. A cable drum according to claim 1 in which ventilation openings
are provided for heat removal in the end wall of the drum body and
in the cover.
7. A cable drum according to claim 1 in which blocks are provided
on the first end side serving as feet.
8. A cable drum according to claim 1 in which the drum body is
mounted in a rotatable fashion in a housing shutting off the space
in the drum body containing the extension cable from outside and
the carrier is fastened to the housing.
9. A cable drum according to claim 8 in which plug holes are
provided on the carrier the distance between them being such that
the contacts on the plug on the extension cable can be pushed into
them.
10. A cable drum according to claim 1 in which the carrier has a
U-shape and extends like a bow in the direction of a diameter of
the drum body over the lamp and is connected to the second end wall
with the free end of its legs.
11. A cable drum according to claim 10 in which the carrier
connected to the second end wall is carried in a rotatable fashion
on the second end wall and can rotate about the axis of the drum
body.
12. A cable drum according to claim 1 in which at least one hanging
hole is provided on the carrier and/or on the end wall.
13. A cable drum according to claim 1 in which the two end walls
have a substantially quadratic periphery.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a cable drum particularly for household,
workshop, building sites and similar use with a carrying handle to
which is connected a cylindrical portion with a first and second
end wall at its two axial ends, containing a drum for an extension
cable and with at least one plug base in a plug base holder with
which the extension cable is electrically connected.
2. The Prior Art
If a cable drum of the known type is used in conjunction with a
lamp, whose connecting cable (for example when working in a room
without any electricity) is connected by means of a plug and plug
base with the cable drum brought to the site, then the very often
unduly long connecting cable presents unnecessary material
expenditure whose disentangling and winding up requires a
relatively large amount of work after the end of the day and
furthermore the usually untidy way in which the cable lies around
causes the danger that someone may trip over it and be injured.
SUMMARY OF THE INVENTION
In order to avoid these disadvantages the invention provides that
the drum has a holder and a lamp and a switch for the electrical
connection between the lamp and the extension cable. The switch may
be in the region of the plug base on the first end wall and the
holder and lamp in the second wall which is opposite to the first
end wall. In order to protect the lamp from damage, the lamp may be
covered by a covering consisting of translucent material. In order
to keep the heat produced by the lamp away from the other parts of
the cable drum, heat insulation plates may be provided on the
second end wall. Similarly, in order to provide heat removal,
ventilation openings can be provided in the end walls of the drum
body and in the cover. If the cover is fastened so as to rotate
with the holder and the holder is arranged to rotate on the drum
body, then the appropriately arranged switch can be operated by
turning the cover. Several feet mounted on the second end wall can
be used for setting the cable drum on the floor; thus a cable
complete with plug inserted in the socket can be led without
difficulty out of the arrangement. If the drum is mounted so that
it can be rotated in a housing which is provided with a handle,
then the cable drum can be held by the handle while the extension
cable is wound in or out. In a particularly favourable arrangement
with regard to manufacturing costs it is envisaged that a U-shaped
piece should act as the carrier; this piece should be mounted above
the lamp in the direction of a diameter of the drum and is
connected to the second end wall at the free ends of both its legs
it being possible also in this case to mount the handle so that it
is rotatable in the second end wall. If several holes in the handle
are provided, these holes having a distance between them
corresponding to the distance between the contacts on the plug
connected to the extension cable, then when the article is not in
use the plug can be simply held on the carrier. For the purpose of
hanging the cable drum, on an arrangement for example on the wall,
for example a nail, at least one hanging hole may be provided on
the handle of the cable drum and/or the end walls. If the two end
walls have a substantially rectangular periphery, then the cable
drum can be set with its periphery on the floor without it rolling
away during winding in or out of the extension cable.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is now described by means of the drawings. These
show:
FIG. 1 is a side view of the cable drum according to the invention
in a first arrangement;
FIG. 2 is a section along the line II--II in FIG. 1 to an enlarged
scale;
FIG. 3 is a similar section to FIG. 2 in a second arrangement;
FIG. 4 shows the detail A corresponding to FIG. 2 but however in a
third arrangement; and
FIG. 5 is a sectional representation of a fourth arrangement of the
cable drum.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the examples of arrangements shown in FIGS. 1 to 4, the cable
drum contains a two-part drum body 3, 4, which contains a
cylindrical part 10 as well as a first end wall 11 and a second end
wall 12. In order to hold together the two parts of the drum body
3, 4 annularly distributed connecting pieces 6 are provided. An
extension cable 14 is wound on the cylindrical part 10, one end of
this extension cable being pushed through an opening 15 in the
cylindrical part 10. Inside the cylindrical part 10 there is a plug
base 7 with sockets 8 connected so as to rotate with the drum body
3, 4, the plug base 7 being connected to the end of the extension
cable 14; this is not shown in the drawings. A holder 16 with a
lamp 17 are disposed in a central opening 18 on the second end wall
12. In the arrangement according to FIG. 2, the holder 16 is
connected so as to rotate with the second end wall 12, the screws
indicated at 19 serving this purpose. The electrical connections to
the lamp 17 (not shown) are connected with the extension cable 14
by means of a switch 9 placed in the vicinity of the plug base 7.
In the arrangement according to FIG. 3, in contrast to the
arrangement according to FIG. 2, the holder 16 is arranged to
rotate in the second end wall 12 and the switch 9' for the
electrical connection to the lamp 17 is on the rear wall of the
plug base 7, there being an operating connection 33 on the holder
and thus the switch 9' is operated by rotating the holder and the
lamp is in this manner switched on or off. The lamp 17 is covered
with a translucent cover 20 of heat resisting material and the lamp
17 is therefore protected from damage. It is also possible by
suitably colouring the cover 20 to utilise the cable drum as a
warning lamp. Because of the heat produced by the lamp 17 it is
desirable to provide heat insulation between the inner space of the
cover 20 and the second end wall 12. In the arrangement according
to FIG. 2 this heat insulation is achieved by two insulating plates
21, 22, between which there is an air space 23; in this case the
cover 20 is for example screwed to the connecting piece 22A between
the insulating plates 21, 22 with the screws indicated at 26 and is
thus connected indirectly with the second end wall 12. It is of
course possible to do without one of the insulating plates 21, 22.
In the arrangement according to FIG. 3 the heat insulation is
achieved by means of an insulating plate 21' which is connected so
as to rotate with the holder 16 and to whose periphery the cover 20
is attached by means of a flap connection 27. On the arrangement
according to FIG. 3, in which as already mentioned the holder 16 is
mounted so as to rotate in the second end wall 12, turning the
cover suffices to operate the switch 9'. Furthermore in this
arrangement according to FIG. 3 the heat insulation is increased by
the air space 23' formed by an insulating plate 21' and the second
end wall 12. According to FIG. 4 it is also possible to fasten the
cover 20 directly to the second end wall 12 in which case the
insulating plates are not fitted and the cover 20 is screwed
directly on the periphery of the second end wall 12 by means of the
screw thread 24. In this arrangement heat insulation is provided by
the coating 25 which can be glued or sprayed on to the second end
wall 12 for example. FIG. 3 shows a further possibility which can
also be used in the arrangement according to FIG. 2; it shows how
the cable drum may be protected from too much heating. In the first
end wall 11 there are ventilation openings 29, in the second end
wall 12 ventilation openings 29' and in the insulation plate 21'
ventilation openings 30. All the ventilation openings 29, 29' and
30 are distributed around the periphery. The air can find its way
through from one side to the other by these ventilation openings
29, 29' and 30 and also through the ventilation opening 28 in the
cover 20; thus the heat produced by the lamp 17 is taken up and
carried away. In this connection it is advantageous if the feet 31
on the first end wall 11, which also are used for positioning the
cable drum, protrude sufficiently far from the end wall 11 so that
when a cable drum is placed on the feet 31 there is sufficient
space left for drawing in the air. The flow of the cooling air is
shown by arrows in FIG. 3. Furthermore the feet 31 are long enough
so that the connecting cable together with its plug can be inserted
into the socket 7 without difficulty. Furthermore the drum body in
the arrangements according to FIGS. 1 to 4 is mounted so that it
can be rotated in a two part housing 1, 2, the housing being
provided with a carrier. The two parts of the housing 1, 2 are held
together by connecting pieces 5, for example in the form of screws
or the like. Because of the rotational support of the drum body 3,
4 in the housing 1, 2, it is possible to hold the cable drum in the
hand while winding in or out the extension cable 14. The housing 1,
2 closes off from outside the space 13 containing the extension
cable 14. It is also possible to rotate the drum body 3, 4 by means
of the feet 31 in the housing in order to wind in or out the
extension cable. The free end of the extension cable 14 can for
example on the second end wall 12 approximately in the region 1A
(or by means of an opening not shown in the housing 1, 2) be lead
to the outside. The extension cable 14 can be wound off the drum
body 3, 4 by pulling on its end.
The arrangement of the cable drum according to FIG. 5 corresponds
in many details to the arrangements shown in FIGS. 1 to 4. Thus the
chrome body 50 contains a cylindrical part 51 as well as a first
end wall 52 and a second end wall 53. The extension cable 54 is
wound on the cylindrical part 51 and led to the plug base through
the opening 55 in the cylindrical part (the plug base is not shown
but is near 58). The end 56 of the extension cable 54 is connected
to the plug base. Furthermore the holder 63 with the lamp 60 is
placed in the central opening 62 in the second end wall 53. The
schematically indicated electrical connections 64, 65 for the lamp
60 are connected with the switch (not shown) via a common
connecting cable 66. (The switch is at 67). A precise presentation
of the region around the plug base is not shown in the arrangement
according to FIG. 5 because this region can be similarly arranged
to that in FIGS. 1 to 4. The region 59 of the second end wall 53
containing central opening 62 is placed opposite the remaining area
of the second end wall 53 in the axial direction. In this way a
piece 68 is formed on which the cover 61 is placed, the connection
between the cover 61 and the second end wall 53 being formed by the
teeth 69 on the piece 68 and by appropriate grooves 70 on the cover
61. This provides a snap connection. There is an annular groove 71
in the second end wall and the edge of the cover 61 fits into it.
Furthermore the end surface 53 has at least one hole 73 in the
radial direction from the periphery of the second end surface to
the annular groove 71. The screw 72 is screwed into this so that
its end grips the edge of the cover 61. In this way the cover 61 is
very firmly held. The screw 72 in the hole 73 is provided with a
counter bore 74 which can be used to hang the cable drum on a
suitable support for example on a wall, for example a nail.
Furthermore a carrier 75 is provided which is U-shaped and is
placed like a bow in the direction of a diameter of the drum body
over the lamp and cover 61. The carrier 75 has a form of a double T
in section and at its free ends are connected to the second end
wall 53. The carrier 75 can therefore be manufactured in one piece
with the drum body 50. It is however also possible to arrange the
free ends of both legs of the carrier 75 so that they can be
rotated about the axis 82 and the second end wall 53 so that the
extension cable 54 can be wound on and off with the carrier 75 held
steady. Plug holes 78 are provided on the cross piece 77 of the
carrier 75, the distance between them corresponding to the distance
between the contacts 79 on the plug 57 of the extension cable 54.
In this way the plug 57 when not in use can be pushed into the plug
holes 78. There are hanging holes both on the carrier and on the
first end wall, 81 to 86, which can be used for hanging up the
cable drum on a suitable support on a wall. The cable drum
according to FIG. 5 can, just like the arrangements according to
FIGS. 1 to 4, be provided with feet 84, 85 which protrude on the
first end wall 52 in the direction of the axis 82 and thus be
placed on the floor. The feet 84, 85 are sufficiently high that
there is sufficient place in the space 83 for a plug pushed into
the socket 58 and that the connecting cable with its plug can be
led without difficulty between the feet 84, 85. It is envisaged
that the two end walls 52, 53 should have a substantially
rectangular periphery so that the cable drum shown in FIG. 5 can
also be placed on its side on the floor. The material envisaged for
the manufacture of the drum body and the drum carrier is hard
rubber but of course other materials for example plastic could be
used.
* * * * *