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Патент USA US2130035

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Sept. 13,1938.
F. c. SéHNABEL >
Filed Aug. 13. 1937
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A iiorneys
Patented Sept. 13, 1938
Frederick Charles Schnabel, Hopkins, Minn.
Application August 13, 1937, Serial No. 159,015
1 Claim. (Cl. 24—253)
This invention relates to a clamp device, the
general object of the invention being to provide
a head formed to provide a jaw and a second
jaw connected with the head by a spring hinge,
5 so that the two- jaws form a clamp for holding
paper or the like.
This invention also consists in certain other
features of construction and in the combination
and arrangement of the several parts, to be here
10 inafter fully described, illustrated in the ac
companying drawing and speci?cally pointed out
in the appended claim.
In describing the invention in detail, reference
will be had to the accompanying drawing where
15 in like characters denote like or corresponding
parts throughout the several views, and in which:
Figure l is an edge view of the device with the
jaws closed.
Figure 2 is a similar view with the upper jaw
2 O in raised position.
Figure 3 is a top plan view of Figure 1.
Figure 4 is a perspective view with the hinged
jaw removed.
Figure 5 is a perspective view of the hinged
25 jaw.
Figure 6 is a view of the pin of the hinge.
Figure '7 is a view of the spring.
As shown in these views,thehead I of the thumb
tack is of substantially rectangular shape in cross
30 section so as to' provide straight edges which re
tard the tack rolling along a surface when
dropped upon the surface, so that there is less
danger of the improved thumb tack being lost
than there is when the thumb tack is made with
35 a round head, as usual. The tack is provided
with the usual point 2 and at one edge the head
on its upper face is formed with the perforated
ears 3 and a groove 4 is formed in the head
between the ears. The movable jaw is shown
40 at 5 and is of substantially the same shape as
the head, but one edge of the jaw 5 is formed
with the perforated hinge ears or barrels 6 which
partly extend into the groove 4 and abut the
inner ends of the ears 3. A hinge pin 1 passes
45 through the ears 3 and 6 and a spring 8 is placed
on the pin and has a central projection 9 ?tting
in a recess I0 in the head I, with the ends I I
of the spring resting on the upper face of‘
the jaw 5. Thus this spring tends to hold the
Jaw 5 against the head I and parts of the con
tacting faces of the head and jaw are roughened,
as shown at I2, to increase the gripping effect of
the two parts.
Thus the spring hinge tends to hold the jaw
5 against the head of the thumb tack, so that these
parts will grip and hold a sheet of paper or the
With this invention, the thumb tack can be
pressed into a drawing board or the like and
the jaw and head of the‘ tack used for holding
the paper or the like, and this will permit the
paper to be changed without removing the thumb
tack from the board. Of course, the thumb tack
can be used in the regular way, and if desired,
the tack can be used in the usual manner for
holding one sheet and a second sheet held by
the clamp.
It is thought from the foregoing description
that the advantages and novel features of the
invention will be readily apparent.
It is to be understood that changesmay be
made in the construction and in the combination
and arrangement of the several parts, provided
that such changes fall within the scope of the
appended claim.
What I claim is:
A device of the class described comprising a
plate, perforated ears extending from one face 30
of the plate adjacent one edge thereof and said
face of the plate having a groove therein lo
cated between the ears, the ends of the groove
terminating at the ears a second plate having
hinge barrels extending from one edge thereof, 35
said barrels partly ?tting in the ends of the
groove and having their outer ends abutting the
inner ends of the ears of the first plate, a pin
passing through the ears and the barrels for
hingedly connecting the two plates together, and 40
a coiled spring on the pin having its ends engag
ing the outer face of the second plate and said
spring having a central projection, the ?rst plate
having a recess therein between the groove and
the adjacent edge of the plate, said recess open
ing into the groove and receiving said projection.
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