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Патент USA US2130072

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Sept. 13, 1938. _
Filed April 30, 1934
[72%572 for
Patented Sept. 13, 1938
Frederick De Cesaris, Cranston, R. I.
Application April 30, 1934, Serial No. 723,199
1 Claim.
(Cl. 24—-11)
My present invention relates to the construc
tion of compasses, and has particular reference
to clamping devices utilized for gripping a pencil
in the compass leg.
The pencil clamping devices now provided on
compasses have certain disadvantages, in that
they either look a pencil in place by denting or
otherwise marring the pencil, or else require a
strong clamping pressure, whereby small children
have difficulty in properly operating the clamp.
These disadvantageous features are particu
larly objectionable because the pencil must be
has the novel pencil clamp H, which is formed
integral, or may be secured to, one leg of the
compass. The clamp l I, see Figs. 2 to 5, includes
a generally cylindrical barrel l2 which may be
of rigid or resilient metal, the barrel preferably
having cut out portions to provide spaced pencil
contact areas, and having aligned pairs of hinge
ears l3, l4 between the spaced barrel sides l5, I6
which are pierced to receive the corresponding
pintles of a cam lever I1 and a curved lock base 10
I8. The cam lever has a cam end l9 engageable
with the free end of the lock bar, and a lever
periodically sharpened, the sharpening usually
portion 20 terminating in a ?nger engageable
requiring removal of the pencil from the compass
end 2| which normally rests between the ears
l4 when the cam lever is in closed position. Both 15
the cam lever and the curved lock bar are prefer
and reclamping.
It is the principal object of my invention to
provide a clamping device that is easily operated
ably stamped from sheet metal.
without the exercise of too much force. Another
object of my invention is to provide a clamp that
20 ?rmly grips a pencil of any standard size, with
out marring the pencil in any way.
The operation of the novel clamp is now clear;
a pencil of any standard size, round, hexagonal,
or the like, is inserted through the barrel, the
cam lever being in open position. The curved
With the above and other objects and advan
tageous features in view, my invention consists
lock bar contacts the pencil side, due to its
of a novel arrangement of parts more fully dis
25 closed in the detailed description following, in
conjunction with the accompanying drawing, and
more speci?cally de?ned in the claim appended
In the drawing,
Fig. 1 is a plan view of a pencil compass
equipped with the novel pencil clamp;
Fig. 2 is a front elevation of the clamp portion;
Fig. 3 is a side elevation of the clamp portion;
Fig. 4 is a sectional view on the line 4-—4 of
35 Fig. 2, the parts being shown in unclamped rela
Fig. 5 is a view similar to Fig. 4, the parts being
shown in clamped relation.
I have devised a novel pencil clamp arrange
40 ment for compasses that is simple to operate and
is effective in locking, without requiring more
than a slight effort on the part of the user to
either lock or unlock the pencil from the com
pass. The novel clamp includes a barrel through
which the pencil is inserted, a hinged lock bar,
and a cam lever which engages the lock bar to
force the lock bar into clamping engagement
with the pencil, thus providing a simple arrange
ment which will function with any size pencil
50 and is easily operated. In-this arrangement the
barrel need not be of resilient material.
I have
also devised modi?ed arrangements, which uti
lize a cam element for pressing the sides of the
55 barrel together, and which utilize a slide element
instead of a cam lever to press a lock bar against
the pencil.
These novel arrangements are described in the
detailed description following, and illustrated in
60 the drawing, in which the compass I0, see Fig. 1,
curvature; closing the cam lever forces the free
end of the lock bar down, whereby the pencil is
?rmly gripped. The cam lever is readily opened 25
by inserting a ?nger nail under the end 2 I.
The above described clamp does not require
any resilience pf the barrel; if desired, however,
the barrel may be resilient.
It is thus evident that the novel clamp is of 30
simple structure, readily manufactured at low
cost, and is easily operated, to both clamp and
unclamp a pencil.
While I have described speci?c constructional 35
embodiments of my invention, it is obvious that
desired changes in the size, material, and ar
rangement of the parts and in their relative posi
tioning and functioning, may be made to suit the
requirements for different compass designs, With 40
in the spirit and the scope of the invention as
de?ned in the appended claim.
I claim:
A pencil leg for a compass or the like, com
prising a pencil receiving part having a pencil 45
clamp including a generally circular body por
tion with integral spaced parallel end walls, an
arcuate member of sheet metal having a convex
portion extending inwardly and hinged in said
end Walls adjacent one end thereof and movable 50
between said end walls to overlie an inserted pen
cil, and a cam lever hinged in the end Walls adja
cent the other end thereof and having a cam
element engageable with the free end of said
member for forcing said member into locking en 55
gagement with the pencil, said cam lever overly
ing said member when in member engaging posi
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