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Патент USA US2105006

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Jan. 11, 1938.
Filed Ffèb. l2, 193.5
2 Sheets-S1166?. l
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Jan. 11, 1938.
2 Sheets-Sheet 2
Filed Feb. 12, 1935
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Patented Jan. 11, 1938
Joseph Pickard, Chicago, Ill.
Application February 12, 1935, Serial No. 6,203
1 Claim. (Cl. 200-54)
The present invention appertains to new and
One end portion of the clamp arm 29 is formed
useful improvements in switches especially adapt
to provide a jaw 32 engageable with a door knob
ed for use in burglar alarm apparatus.
shank (not shown) and which coacts with a piv
The principal object of the invention is to oted jaw 33 for securing said arm 29 in position.
5 provide a burglar alarm switch which is especial
A screw 34 is mounted in the arm 29 and extends
ly adapted for use in hotels and other public slidably through the pivoted jaw 33 and has
dwelling places.
threaded thereon a wing nut 35 for closing said
Another important object of the invention is pivoted jaw against the tension of a coil spring 36
to provide a switch structure which can be con
10 veniently installed for use in conjunction with
burglar alarms without requiring alteration of
the building construction.
Other objects of the invention are to provide a
burglar alarm switch which will be comparatively
simple in. construction, strong, durable, eilicient
and reliable in use, compact, portable and which
may be manufactured at low cost.
All of the foregoing and still further objects
and advantages of the invention will become ap
20 parent from a study of the following specification,
taken in connection with the accompanying draw
ings wherein like characters of reference designate
corresponding parts throughout the several views,
and wherein:
Figure 1 is a view in front elevation of the door
Figure 2 is a top plan View of the door switch.
Figure 3 is a view in rear elevation of the door
Figure 4 is a vertical sectional view, taken sub
stantially on the line 4--4 of Figure 1.
Figure 5 is a View in front elevation of the
operating means for the door switch.
Figure 6 is a detail View in perspective of the
35 rod constituting a part of the door switch operat
ing means.
Referring particularly to Figures 1 to 4, inclu«
sive, of the drawings, it will be seen that the door
unit I ‘I includes a clamp which is designated gen
40 erally by the reference numeral I8 which is
adapted to be removably mounted on the door
frame I9. The clamp I8 includes a pair of op
posed, co-acting jaws 20 which are slidably con~
nected with each other and which are adapted to
45 embrace the door frame I9 therebetween. As
best seen in Figure 3 of the drawings, the longi
tudinal portion of one of the jaws 20 is provided
with inturned flanges 2I providing channels in
which the other of said jaws is slidable.
50 elongated screw 22 is mounted in the opposed por
tions of the jaws 20 and provided with a wing nut
23 for clamping said jaws on the door framíe I9.
Mounted on the clamp I8 is a switch 24 which
includes contacts 25 with which a pivoted blade
55 26 is engageable, said blade 26 being provided
with a projection or handle 2'I on its free end
which. is mounted on said screw 34. Rising from
the upper end of the arm 29 is a reduced threaded 10
shank 31 having mounted thereon a pair of wash
ers 38 between which a rod 39 is adjustably se
cured by a wing nut 40 on said shank 31. The
rod 39 is preferably formed from a single length
of suitable wire and said rod has formed on one
end thereof a vertically elongated loop 4I in
which the handle or projection 21 of the switch 24
is engaged. At its other end, the rod 39 termie
nates in a substantially U-shaped portion 42 (see
Figure 6) which straddles the shank 31 and which
is clamped between the washers 38. It may be
well to here state that the switch 24 is secured
on one of the jaws 20 of the clamp I8 by a bolt
43, the other jaw 20 having formed therein a slot
44 which accommodates said bolt and the secur 25
ing nut thereon, as shown to advantage in Figure
3 of the drawings.
It _is believed that the many advantages of a
burglar alarm constructed in accordance with the
present invention will be readily understood, and 30
although a preferred embodiment of the inven
tion is as illustrated and described, it is to be
understood that changes in the details of con
struction and in the combination and arrange
ment of parts may be resorted to which will fall
within the scope of the invention as claimed.
What is claimed is:
A switch operator comprising a switch operat
ing arm having an outstanding pintle, a door
knob attaching clamp, said clamp consisting of
an elongated member having a curved end por
tion, a leg pivotally secured at one end to the
intermediate portion of the elongated member
and having its opposite end portion curved and
opposed to the curved end of the elongated mem 45
ber, a bolt and nut connecting the leg with the
elongated member, a coiled compressible spring
on the bolt having its ends impinging against the
said elongated member and the leg, the upper end
of the elongated member being provided with a
threaded extension, a nut on the threaded exten
sion, a connecting rod having a slotted end receiv
ing the pintle on the switch arm, the other end
of the rod being secured to the door knob clamp
by the clamping action of the nut on the threaded
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