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Патент USA US3080487

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March 5, 1963
Filed Aug. 5, 1960
@5144,w f/Z/w
“ atent
Patented Mar. 5, 1963
Floyd E. Kemp, 155 Ashury St, Evanston, Ill.
Filed Aug. 5, 1960, Ser. No. 47,722
4- Claims. (Cl. 240-5215)
the spool 25 into the truck interior, the bracket carrying
the lamp 30. A passage is provided through the spool and
bracket for a cord 32 which supplies electric current to
the lamp.
The housing 20 contains a switch interposed between
the cords 18 and 32. Thus, one terminal of this switch
receives the feed wires 18a of the cord 18 in the contact
My invention relates to trucks which are loaded and
posts 35a of a companion pair of curved blades 35. These
unloaded on freight docks, and more particularly to the
bear against an insulation block 37 which is slidable in
lamps employed for illuminating the interior of the trucks.
This type of lamp is carried by a cord which leads from 10 the rear end of the housing 20, the inner end of the block
having hollows 37a to seat the blades, and a partition 37b
the ceiling of the dock. When the rear doors of the truck
to separate them. The block also has longitudinal top and
have been opened, the conventional lamp is hooked or
bottom grooves 370 receiving housing ribs 20a for sliding
otherwise temporarily attached over the entrance, so that
guidance and to keep the block from turning.
the interior of the truck is illuminated while loading or
In the forward end portion of the housing is lodged
unloading is going on. However, at times the driver of 15
a partition disc 40 extended with a central boss 40a.
the truck forgets to detach the lamp when he drives
To the latter are applied the end portions of a companion
away from the dock, in which event the cord is broken and
pair of spring loops 42 which are in registration with the
the lamp is carried away by the truck.
‘curved blades 35. Thus, when the block 37 is pushed
In view of the above disadvantage, it is one object of
the present invention to provide a lamp which becomes 20 inwardly, it will arch the blades until they meet the loops
42; and the further advance of the block will Wrap the
detached from the truck automatically and without dam
age or other impairment in case the truck is driven away ' blades over the loops and compress the latter to the bulg
ing form illustrated in FIG. 4.
from the dock while carrying the lamp.
Before the cord enters the housing 20, it descends
A further object is to employ a magnetic mounting
device for the lamp which is attachable to the top of the 25 through a keeper 45 behind the switch block 37. The latter
has a latch 47 hinged horizontally at 47a and poised
truck over the rear entrance by simple application.
apart from the cord 18 when the lamp is not in use and
Another object is to employ an electromagnet as the
the switch block 37 is in the backed position indicated in
attaching device for the lamp, and include the electro
FIG. 3; and the tension of the blades 35 normally main
magnet in the Wiring circuit of the lamp.
An additional object is to provide a holder for the 30 tains the switch block in the backed position, which is an
lamp which incorporates a switch in the electromagnet
indication that the switch is open.
When the device is to be applied to a truck, the ?rst
concern is of course to light the lamp. To do this, the
lamp in case the truck departs from the dock and pulls on
latch 47 is swung down to the horizontal position indicated
the cord, the electromagnet releasing its hold in such
event and causing the lamp to drop away from the truck. 35 in FIG. 4. The length of the latch ?rst causes it to bear
rearwardly on the cord 18 and seat the same ?rmly in the
Another object is to construct the novel lamp as a com
rear end of a keeper 45; and the action of the latch also
pact unit, and along lines of simplicity.
causes it to bear forwardly on the switch block 37, to the
A better understanding of the invention may be gained
extent of closing the switch as shown in FIG. 4. The
by reference to the accompanying drawing, in which—
FIG. 1 is a fragmental rear view of the truck body, 40 switch connects with the wires 32a of the cord 32 by
way of the terminals 42a of the loops 42, and the lamp
showing the lamp attached to the same;
therefore becomes lighted by the action just described.
FIG. 2 is a section on the line 2—2 of FIG. 1;
The housing carries an electromagnet 50 in its front
FIG. 3 is an enlarged section on the line 3—3 of FIG. 2,
end, the core 50a of which may project as shown. The
showing the switch open;
FIG. 4 is a view similar to FIG. 3, showing the switch 45 terminals of the electromagnet are shown at 5612, and
connection between them and the terminals 42a is made
closed; and
by spring contact strips 52 carried by the disc 40, or other
FIGS. 5 and 6 are, respectively, sections on the lines
suitable means, whereby to include the electromagnet in
5—5 and 6—6 of FIG. 3.
circuit and means to open the switch and extinguish the
the lamp circuit. Now the device is ready for applica
Referring speci?cally to the drawings, 10 denotes a
typical truck body, with side doors 11 hinged to the same 50 tion with the electromagnet core Sila to the metallic top
edge 13 of the truck as indicated in FIG. 2, so that the
at 12 and shown folded back. The metallic rear edge of
lamp is supported to illuminate the interior of the truck.
the body top is indicated at 13.
When the work in the truck is ended, it is only neces
The ceiling or overhead support of the dock in which
sary to open the latch d7 in order to extinguish the lamp
the truck is loaded or unloaded is indicated at 15, with
an electric outlet ?xture 17 installed. A cord 13 depends 55 and de-energize the electromagnet. The device will now
drop away from the truck and remain suspended from the
from the ?xture to terminate with the usual lamp designed
?xture 17 until its use is again required. However, should
to provide illumination for the interior of the truck while
the driver or truck attendant neglect to open the latch,
it is in the dock. When the lamp is not in use, it simply
but drive off with the truck, the pull on the cord 18 will
hangs from the ?xture to a point where it may be reached
from the rear of the truck.
60 be upward in relation to the latch 47 and keeper 45, so
that the cord will open the latch. The relaxation of the
For the present purpose the cord 18 does not lead to the
blades 35 will now open the switch in the housing 20,
lamp directly, but through the intermediary of a lamp
causing the lamp to become extinguished and the electro
holder or attaching unit 20. Primarily this unit is in the
magnet to release its hold, so that the device drops away
form of a horizontally-positionable tubular housing made
from the truck to the suspended or idle position mentioned.
in lower and upper halves 20 and 21 which are secured
By making the housing in upper and lower halves, it
together by side lugs 22, bolted at 23. The housing carries
will be possible to assemble its contents with facility; and
a pendent vertical spool 25, having an end ?ange indicated
the disc 40 and electromagnet 50 may be locked in place
at 25a; and the cord—-if found too long-is designed to
by being formed with peripheral pockets 40c and 500
be wrapped around the spool before entering the housing
which receive lugs 29d carried by the walls of the housing.
20, as shown in FIGS. 1 and 3. FIGS. 2 and 4 show 70
it will now be apparent that the present device accom
that a bracket 27 extends laterally from the lower end of
plishes the mounting of the lamp in the truck with an
v sped/s77
automatic detaching factor. Normally, the device would
be detached manually when the truck is about to be driven
away; or, where it is necessary to close the doors of the
truck before leaving, the position of the device is an
obstacle. to the’ closing of the doors and therefore dic
tates the. manual removal of the device before the doors
are closed. However, where the truck has been emptied
or has few contents, the closing of the doors may be con
said cord; said housing including therein a normally‘open
switch, said switch including a ?rst contact means elec
trically connected to said electromagnet means; an elec
trically energized lamp carried by said housing and electri
cally connected to said ?rst contact means for simultane
ous energization‘ with said electromagnet means; said
switch including a‘ switch block displaceably supported ‘
in said housing in opposition to said cord-keeper means;
sidered unnecessary and the removal of the device ne
said switch including a biasing-contact means electrically
glected or overlooked, in which event the automatic de 10 connected to said cord and normally spaced from said
taching feature would accomplish the removal of the de
?rst contact means engaging said switch block and nor
vice and the extinguishing of the lamp withoutda-mage
to or loss of any part. The cord 18 should be made of
ample length in case the truck is located at 'a distance
mally urging the block toward said cord-keeper means;
said switch block including a latch’ movably mounted
thereon and clampingly engageable with saidcord ad
from the outlet ?xture 17. However, where the truck is 15 jacentand against said cord-keeper means in opposition
nearby or directly underneath, the slack in the cord may
to said biasing-contact means for urging said‘block and
be taken up by wrapping it on the spool 25, so that no
biasing-contact means toward said ?rst contact means
part of the cord will hang in back of the truck entrance
for closing a circuit therebetween and simultaneously
to be inthe way. Further, the exposed position of the
energizing said electromagnet means and said lamp.
devce and- its liability to impact with the truck or objects 20 2. The structure of claim 1 wherein said housing in
being moved in, or out of the same would disqualify the
cludes a depending spool and bracket supporting said
use of a conventional switch, whereas a strong pressing
lamp, said lamp electrical connection including a current
and wrapping engagement is secured in the present switch
conductor threaded in said spool and bracket and elec
which should enable it to withstand shocks and vibra ' trically connected to said ?rst contact means.
tion; and the fully enclosed position of the switch should 25 3. The structure of claim 1 wherein said ?rst contact
protect it against corrosion from climatic conditions.
means comprises a U-shaped leaf spring extending toward
While I have described the. invention alongspeci?c
said switch block, said biasing-contact means comprising
lines, various minor changes or re?nements may be made
an arcuate leafspring disposed in confronting relation
therein without departing from its principle, and I re
to said U-shaped leaf spring, said switch block including
serve- the right to. employ all such changes and re?ne 30. an arcuate groove slidably receiving» said arcuate leaf
ments as may come within the scope and spirit of the
appended claims.
4. The structure of claim lwherein ‘said latch com
prises a lever pivotally mounted on said switch block.
I claim:
1. An automaticallyoperating switch-and-lamp holder
for‘use'on a magnetically atractive support surface com 35
prising in combination anelectric current conducting
cord; a hollow housing; said housing including electro
' magnet means for engagement on' said magnetically at
tractive support surface; said housing including cord
keeper means extending about an intermediate portion of 40
7 s
References Cited in the ?le of this patent
Koenig ______________ __ June 22, 1920
Little _~_ _____________ __.Nov. 18, 1924.
Dobkins ______ -_l'_ ____ __ Nov. 1, 1955
Nicholson et al. ____ ..'.._.. Apr. 24, 1956
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