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Патент USA US3041070

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June 26, 1962.
3,041,060
J. JACOBSEN
ADJUSTING MEANS FOR A LAMP STRUCTURE
Filed April 12, 1960
2 Sheets-Sheet 1
June 26, 1962
J. JACOBSEN
3,041,060
ADJUSTING MEANS FOR A LAMP STRUCTURE
Filed April 12, 1960
2 Sheets-Sheet 2
1
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INVENTOR
BY
ATTORNEY
United States Patent 0 " ice
3,041,060
Patented June 26, 1962
2
1
turning the screw 25 the spring 23 is tensioned to a de
3,041,060
Jacob Jacobsen, Ekelyveien 10, Oslo, Norway
The present invention relates to adjusting means for a
lamp structure comprising at least one by means of ten
sired degree. Surrounding the ends of the spring are
covers 26, for instance of metal or plastic, which by
means of a transverse opening 27 is supported on the
member 22, an opening 29 in the end of the cover 26
forming base for the head of the screw 25. The lower
cover in FIGURE 2 has a throughgoing opening 27 for
instance for the arrangement of more than one spring
sion springs equipoised parallelogram linkage assembly.
on the same support member 22.
ADJUSTING MEANS FOR A LAMP STRUCTURE
Filed Apr. 12, 1960, Ser. No. 21,800
5 Claims. (Cl. 267-1)
In FIGURE 3 support members 32 are pivotally
fastened on two different parts of the lamp structure
31. The spring 33 has in both ends 34 contracted di
ameter so that the spring ends engage the threaded part
as the weight of the lamp may change by changing the
of the screws 35. In this case the ends of the spring
light source, by changing the lamp reflector and the
spring tension may vary with time. To obtain an ap 15 are also provided with a cover 36 which by means of
a transverse opening 37 is supported on the member 32
proximate correction of such eventualities it is known by
and ?xed by the screw 35 which extends through an
such lamp structures to arrange in the bar-s more than
opening 39 in the end of the cover 36. The spring 33
one anchorage hole for at least one end of the spring, so
is tensioned by turning the screw 35 by means of a
as to enable a step by step tensioning of the spring.
The object of such lamp structures is that the lamp 10
should be set in any. desired position and thereby re
main in this position. This effect is not easy to obtain
Such a step by step tensioning has proved not to be 20 screw driver.
satisfying.
The main object of the present invention is therefore
by such a lamp structure to provide a continuous adjust
ment of the spring tension.
This is according to the invention achieved in that ‘at 25
least one end of each spring is connected to a ?xed on
the structure rotatable member, by means of a screw
In FIGURE 4 support members 42 are pivotally
fastened on two different parts of the ‘lamp structure 41.
The spring 43 is at both ends provided with a nut 44
for screws 45 which extend through holes 48 in the
members 42.
In this case the covers 46 are extended
and given different diameters so as to overlap each other
telescopically and thereby surrounding the whole spring
which is ‘freely rotatable in said member, in such a way
43.
that the spring tensioning may be continuously adjusted
the covers, these are supported on the members 42, an
By means of transverse openings 47 in the end of
by rotation of the screw either by hand or by means of
opening 49 in the end of the cover 46 forming base for
a screw driver.
the head of the screw 45.
In a preferred embodiment according to the invention,
the threaded part of each screw engages a nut ?xed to the
The head 50 of the screws
45 is adapted to be operated by hand for adjustment of
the spring tension.
I claim:
1. In an equipoised lamp mechanism which includes a
In another embodiment according to the invention 35
linkage assembly comprising ?rst and second paral
the diameter of the end of the spring coil is contracted
lelogram linkages and an intermediate frame member
to engage the threaded part of the screw.
spring end.
To stiffen the spring ends is, according to the inven
tion, each end of the spring surrounded 'by a cover which
by means of a transverse opening is supported on the
pivotally interconnecting the linkages in end-to-end rela
tionship and a base frame member pivotally connected to
the other end of one of said linkages and a top frame
member pivotally connected to the other end of the
other of said linkages and a lamp construction mounted
upon said top frame member; a pair of spring assem
said member and ?xed by the screw which extends
through an opening in the end of the cover.
To prevent dust concentration in the spring and to
blies one of which is connected at one end to said base
give the structure a better look, are according to the
invention the covers extended and given different di 45 frame member and at the other end to the adjacent
parallelogram linkage, the other of said spring assem
ameters so as to overlap each other telescopically.
blies being connected at one end to said intermediate
Some embodiments of the invention will be more de
frame and at the other end to the other of said paral
tailed explained with reference to the accompanying
lelogram linkages, one of said spring assemblies includ
FIG. 1 shows an over-all perspective view of a lamp 50 ing an extensible tight-wound tension spring, means at
each end of said spring providing for threaded engage
structure with adjusting means according to the invention.
ment with a screw, a pair of screws threaded respectively
FIG. 2 shows one embodiment of the invention.
into the last-named means, means ?xed respectively to
FIG. 3 shows a second embodiment according to the
drawing.
the frame member and the parallelogram linkage and
'
a
FIG. 4 shows a third embodiment according to the 55 providing an opening in which the adjacent screw is held
and permitted to turn thereby to provide for adjusting the
invention.
In FIGURE 1 a lamp structure 1 is clamped to a
tension of the spring by turning the screw, and a pair of
invention.
table or desk 2 by means of a base member 3. The
covers ?xed respectively to the last-named means and
structure 1 has an upper pivoted lever assembly 5 com
covering the adjacent end of the spring and the connect
prising the bars 10 and 11 and a lower pivoted lever 60 ing portion of the screw.
assembly 4, comprising the bars 6 and 7, the lower end
2. Apparatus as described in claim 1, wherein the
of which is pivoted to a swivel bearing member 8 which
cooperate with the base member 3. The upper end of
the lower lever 4 and the lower end of the upper lever
means at each end of said spring providing threaded
engagement with the screw comprises a cylindrical plug
threaded into the end of the screw and having a thread
5 are connected pivotally by means of a member 9. The 65 ed bore into which the screw is threaded.
upper end of the upper lever 5 being by means of a
3. Apparatus as described in claim 1 wherein the
member 12 pivotally connected to the lamp re?ector 13.
means at each end of said spring providing threaded
In FIGURE 2 support members 22 are pivotally
engagement with the screw comprises the end portion of
fastened on two diiferent parts of the lamp structure
21. The spring 23 which serves as equipoising means, 70 the spring which is reduced in radius so as to form a screw
thread.
at both ends is provided with a nut 24 for screws 25
4. Apparatus as described in claim 1 which includes
which extend through holes 28 in the members 22. By
»
3,041,060
a pair of telescoped sleeves enclosing said spring and
connected respectively to move with the screws.
5. In an equipoised lamp mechanism which includes
a linkage assembly comprising ?rst and second paral
lelogram linkages and an intermediate frame member
pivotally interconnecting the linkages in end-to-end rela
tionship and a base frame member pivotally connected
to the other end of one of said linkages and a top frame
member pivotally connected tothe other end of the other
of said linkages and a lamp construction mounted upon
4
drical plug nested within one end of said spring and
having a threaded axial bore engaging said screw thereby
to provide for adjusting the tension of the spring by
turning the screw, and a pair of covers, one of which is
?xed to the support means and covering and connected
to the adjacent end of the spring, and the other cover
being ?xed to the support means and covering the other
end of said spring and the connecting portion of said
screw.
References Cited in the ?le of this patent
said top frame member; a pair of spring assemblies one
of which is connected at one end to said base frame
member and at the other end to the adjacent paral
lelogram linkage, the other of said spring assemblies
being connected at one end to said intermediate frame 15
and at the other end to the other of said parallelogram
linkages, one of said spring assemblies including an ex
tensible tight-wound tension spring, support means for
said spring ?xed respectively to the frame member and
to the parallelogram linkage and including a bracket 20
having ‘an opening, a screw held in said opening, a cylin
UNITED STATES PATENTS
836,811
1,966,957
Kennebrew __________ __ Nov. 27, 1906
Dunn ______________ __ July 17, 1934
2,090,439
Carwardine __________ __ Aug. 17, 1937
2,129,338
2,265,629
Timmons ____________ __ Sept. 6, 1938
Christiansen _________ __ Dec. 9, 1941
2,787,434
J acobsen ____________ __ Apr. 2, 1957
.
179,826
FOREIGN PATENTS
Austria _____________ _._ Oct. 11, 1954
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