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Патент USA US3071691

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Jan. 1, 1963
3,071,681
R. G. SCHMIDT ETAI.
FHOTOFLASH APPARATUS
Filed Jan. 15, 1961
INVENTORS
RONALD G. SCHMIDT
JOHN G. TOMKINSON
BY
~
I
ATTORNEY
United States Patent Office
1
3,071,681
PHOTGFLASH APPARATUS
Ronald G. Schmidt and John G. Tornkinson, Denver,
Colo., assignors to Minneapolis-Honeywell Regulator
3,071,681
Fatented Jan. 1, 1963
2.
facturing variations Within a given tube type and also
allow for expansion or contraction due to variations in
temperature or other affecting factors while still providing
a ?rm, positive grip on the tube.
FIGURE 1 is a front or full face view of a photo?ash
re?ector, showing a U-shaped ?ash tube mounted within '
it by means of the bracket which is shown in detail at
ware
Filed Jan. 13, 1961, Ser. No‘. 82,562
FIGURE 3.
3 tClaims. (Cl. 240-13)
FIGURE 2 shows the re?ector in cross section to pro
vide a detailed picture of the manner in which the bracket
10
The present invention relates to improvements in that
and ?ash tube are mounted within the re?ector.
portion of the photographic art utilizing electronic photo
FIGURE 3 is a detailed view of the mounting bracket.
(Iompany, Minneapolis, Minn, a corporation of Dela
?ash apparatus;
FIGURE 4 shows a modi?ed form of the mounting
A broad object of the invention is to provide a simple
bracket wherein the frame member is of a “solid" con
means of mechanically and electrically placing a gas
struction which provides a greater amount of heat pro
?lled, electronically ?red ?ashtube within a re?ecting en
tection for the re?ector surface.
closure. Present practice in the art usually provides for
In FIGURE 1 of the drawing, the reference numeral
positioning and affixing the ?ash tube by methods wherein
11 refers to the photo?ash re?ector which is of the usual
several manufacturing and assembly steps or procedures
forwardly directed concave design. Numeral 12 refers to
are required.
an electronic discharge device or gas~?lled photo?ash tube
The present invention provides a means whereby the 20 which is of the standard U-shaped construction. The
bracket or clip used for mechanically af?xing the photo
photo?ash tube is held in place within the re?ector by a
?ash tube may also be utilized as a triggering electrode.
mounting clip or bracket (such as the brackets shown at
Present practice quite generally involves “painting” a
3 or at FIGURE 4).
metallic or conductive strip on the tube itself. To this 25 FIGURE
FIGURE 2 shows the U-shaped photo?ash tube 12
painted strip is applied a voltage for the purpose of ini
mounted in position. ‘Re?ector I1 is provided with two
tially ionizing the gas contained within the tube with or
diametrically opposed openings 15 and 16, which serve
for a resultant purpose of “triggering” or starting the
the purpose of allowing the mounting clip or bracket to
ionization process that results in a brilliant ?ash. The
be inserted in position within the re?ector. The bracket
apparatus, the details of which are divulged in this applica 30 is ?tted with an extension 19 formed in a manner to
tion, eliminates the manufacturing steps necessitated by
painting the conductive strip. The mounting means serves
in the capacity of a triggering electrode.
create a U-shaped clamp means which “?ts” over a pro
truding portion of the re?ector body in a manner that
provides pressure coupling thereto. (Reference is made
The invention protects the photo?ash re?ector surface
to FIGURE 3 for detailed numbering of the bracket.)
from‘the heat generated by the photo?ash tube. Many, 35 Reference numeral 20 identi?es an extension of the
or most re?ecting surfaces in the photo art are disposed
by a vacuum metalizing process. This vacuum metalizing
process places a very thin re?ecting surface on the re
bracket frame member which is constructed in a manner
to form a spring biasing adapted to be passed through
opening 16 and spring bias the clip or holder against the
re?ector body. The bracket extension 20‘ which is also
?ector shell which is susceptible to heat damage. It is
contemplated that the bracket frame member, as incorpo 40 constructed of a material having a su?icient resilience to
rated in the present invention, may serve as a buffer be
give it a spring-like characteristic, is adapted to pass
tween the ?ash tube and the re?ecting surface. The
through an opening or hole in the re?ector. It is formed
heat protection afforded by this invention will allow an
in such a manner as to provide a spring biasing against
even thinner coating of re?ecting surface or a more heat
the sides of the ‘opening through which it is passed.
sensitive coating material for the general re?ector con
Bracket extension 20 is provided with protrusions 21
struction than has been used in the past. By being posi
for the purpose of “locking” the clip into place after it
tioned between the ?ash tube and the re?ecting surface,
has been inserted to the desired position within the re
the bracket frame member will prevent the re?ecting sur
?ector. When bracket extension 20 has been passed
face from being confronted with the heat generated.
through to the desired position, its spring-like charac
The subject invention will provide a positive method
teristic forces its opposing portions apart, which in turn
for exact positioning of the photo?ash tube. Study and
forces the protrusions 21 to lock against the re?ector body,
past experience have shown that in order to get maximum
thus preventing the bracket from being displaced from
advantage from a given concave re?ecting surface, exact
its desired position until such time as the extension 20 is
positioning of the ?ash tube with respect to the concave
compressed to a point whereby protrusions 21 may be
surface is very important. The present invention, by the 55 released and passed through the re?ector opening 16.
simple procedure of inserting the bracket, will perform the
The bracket frame member (the main portion or ?at
operation of the desired exacting positioning.
surface designated as 22 in FIGURE 3) is presented be
Servicing in the ?eld is also made easier in view of the
simpli?ed method of tube placement. Much concern has
tween the re?ector shell and the photo?ash tube, and has
the effect of protecting the surface of the re?ector from
been expressed over the servicing problem represented by 60 the heat given off by the ?ash tube. Resilient grasping
the necessity of positioning a replacement tube in the
?ngers 23 and 24 are shown in FIGURE 2, acting in their
proper position.
The present invention also provides a ?rm and stable,
yet resilient photo?ash tube mounting means. It is desira
ble wherein a glass object such as a photo?ash tube is
capacity of holding the photo?ash tube in a captive posi
tion.
As may be seen from FIGURE 2, the bracket
(which is shown in detail at FIGURE 3) is constructed
combination of resilient grasping ?ngers and spring bias
and positioned in such a manner as'to “hold” the ?ash
tube in a captive position but in effect, “?oating” on the
end which is held in position by the spring bias means.
The resilient ?ngers which hold the photo?ash tube are
mounting provides an area of “give” which will create the
constructed in a manner which will allow expansion or
desired cushioning effect. Also, it might be added, that
the resilient ?ngers provide a holding means for the photo~
contraction of the ?ash tube while they maintain their
?rm grip thereon. The bracket is shown in detail at
utilized, to provide a cushion against shock resulting from
accidental dropping or striking of the ?ash unit. The
tube which will allow a Wide degree of tolerance for manu
FIGURE 3. Numerals 23, 24, 25, 26, and 27 refer to
3,071,681
4
the grasping ?ngers which form a part of the bracket.
These ?ngers, as stated previously are constructed of a
?ash tube and said bracket within said re?ector such that
said second extension enters one of said spaced openings
material and in a manner that makes them resilient or
in said re?ector and expands to engage said re?ector with
springlike. The broad U-shaped frame extension 19
forms a channel which is adapted to ?t over a portion of U! said ?rst extension then in position at the other of said
openings to clamp a portion of said re?ector within said
the re?ector body in a manner that creates a “pressure
U-shaped clamp means, said photo?ash tube and bracket
holding.” The U-shaped member 19 is ?tted with an
being removable from said re?ector by virtue ‘of compres
extension 28 for the purpose of allowing an electrical
sion of said second extension to disengage said re?ector,
connection thereto. The main frame 22 is formed in a
and a tab formed on said bracket adapted to receive elec
manner that allows it to follow the contour of, and to be 10 trical wiring means.
placed in immediate proximity with the photo?ash tube.
2. ‘In combination; a photo?ash re?ector having a pair
Thus the frame member, which is made of an electrically
of spaced openings, a curved photo?ash tube, a one piece
conductive material, forms a path of current for “trigger
bracket having resilience and electrical conductive proper
ing” or “?ring” voltage which is applied at the clip ex
ties, said bracket having a curved frame member formed
tension 23.
to follow the contour of said curved photo?ash tube and
A modi?ed clip frame member, as shown in FIGURE
having
resilient'?ngers extending therefrom, means in
4, is of a solid construction. By this “solid” construction,
cluding said ?ngers for holding said photo?ash tube in a
a greater amount of shielding against heat damage is pro
captive position, a ?rst extension on said frame member,
vided. ‘The clip as represented in FIGURE 4 is also
a
second extension on said frame member, said ?rst and
utilized for all other purposes including that of a trigger
second extensions having means removably mounting said
ing electrode, as is the construction represented at
photo?ash tube and said bracket within said re?ector
FIGURE 3.
such that said second extension enters one of said openings
From the above description, it is evident that we have
in said re?ector with said ?rst extension then in position
invented an apparatus which provides an accurate, simpli
at the other of said openings, and a tab formed on said
?ed and less expensive means of phototube mounting.
25 bracket adapted to receive electrical wirinc means.
We claim as our invention:
3. The combination as claimed in claim 2 wherein said
1. In combination; a photo?ash re?ector having a pair
of diametrically spaced openings, a curved photo?ash
tube, a one piece bracket having resilience and electrical
conductive properties, said bracket having a curved frame
member formed to follow the contour of said curved
photo?ash tube and having resilient ?ngers extending
therefrom, means including said ?ngers for holding said
photo?ash tube in a captive position, U-shaped clamp
means formed by a ?rst extension on one end of said 35
frame member, a second extension on said frame member
including a resilient spring clip, said ?rst and second ex
tensions forming means removably mounting said photo
bracket is positioned between said photo?ash tube and said
re?ector to protect said re?ector from the heat generated
by said photo?ash tube.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,975,820
2,392,828
2,766,020
Wright _______________ __ Oct. 9, 1934
Noel ________________ __ Jan. 15, 1946
‘Woods _______________ _.. Oct. 9, 1956
2,906,862
2,948,938
McCammon __________ __ Sept. 29, 1959
Holton ______________ __ Aug. 16, 1960
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