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Патент USA US2106041

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Jan.'18, 1938.
F. scl-léaEL El‘ AL
Filbd- March 3, 1937
4 Fritz Schébel,
' I
Their" Attorney.
Patented Jan. 18, 1938
Fritz Schiibel, Berlin-Pankow, and Paul Schubert,
Berlin-Karlshorst, Germany, assignors to Gen
eral Electric Company, a. corporation of New
Application March 3, 1937, Serial No. 128,842
In Germany March 10, 1936
5 Claims.
(01. 74-100)
Our invention relates to mechanical motion
transmitting devices, and more particularly to
motion transmitting devices of the slotted crank
One object of our invention is to provide an
improved slotted crank capable of moving into
each of two extreme positions with a snap action.
Another object of our invention is to provide
improved operating mechanisms for valves used
in gas meters.
Our invention will be better understood, and
other and further objects of our invention will
be apparent by reference to the following de
scription when taken in connection with the ac
15 companying drawing, and its scope will be pointed
out in the appended claims.
In the .accompanying drawing, Fig. 1 discloses
in perspective, a front elevation of our improved
motion transmitting device as applied to a gas
20 meter, and Fig. 2 is an end view partly in cross
section of the operating arm, or crank, illustrated
in‘ its two extreme positions.
Referring to the drawing in detail, Fig. 1 illus
trates a valve housing 5 of a gas meter such as is
25 disclosed in U. S. Patent 1,878,344 issued Sep
tember 20, 1932, divided by a wall 6 into two
chambers 'I and 8, each of which contains an
opening controlled by a valve. The valves 9 and
II], respectively, controlling these openings, are
arranged in such manner that when one of the
auxiliary chambers is closed, the other is opened.
In Fig. 1, the valve 9 is illustrated as being open,
and the valve In is shown as being closed, their
respective stems II and I2 being arranged to
35 move horizontally, in any suitable guides (not
shown), are connected by a crossrod I3, upon
which is mounted a spool I4. The spool I4 is
loosely mounted on the cross rod I3, and is en
gaged by our improved device.
The motion transmitting device built in ac
cordance with our invention comprises a crank I5
mounted at one end on an operating shaft I6, and
provided at the other end with a pair of parallel
rods I1 and I8 extending at right angles to the
45 crank I5 and upwardly between the ?anges, and
on opposite sides of the body of the spool I4.
The parallel rods I1 and I8 are preferably made
of a single length of metal wire, preferably of
such metal as bronze or spring steel, bent into the
50 shape of a hair-pin and supported at the apex
by a collar I9 formed at the end of the crank I5
by ears 2D and 2| which are bent about the rods
I1 and I8 to rigidly hold them in position. A
kink 22 in the rod I‘I near the apex enables the
ear 20 to better grip the rod 11. The rod I8 is.
straight, and rod I1 is provided with a second
kink 23 near its upper end, projecting inwardly,
and providing a short narrowed space between
the rods I‘! and I8. The operating crank being
mounted upon the shaft I6, moves the parallel ,
rods I1 and I8 in an arcuate path, thereby pro
ducing a horizontal movement of the spool I4 and
the valve mechanism connected thereto, and a
vertical movement of the kink 23 relatively to
the spool; the kink 23 being above the spool in 10
one operating position of the valves and below
the spool in the second operating position. The
mechanism for turning the shaft I6 is not shown,
since it forms no part of our present invention.
Our improved device is, however, specially adapt
ed for use in gas meters of the type disclosed in
the above-mentioned Strelow patent, and the
mechanism therein disclosed can be adapted to
rotate the shaft I6. The position of the crank
in the two operating, or end, positions is better 20
illustrated in Fig. 2.
Referring to Fig. 2, the shaft I6, together with
the operating crank I5 and the parallel rods I1
and I8, are shown in full lines in the same posi
tion as in Fig. 1. The second position of the 25
rods I1 and I8 is shown in dotted lines. In this
second position of the rods I1 and I8, the connect
ing rod I3 has been moved inwardly to close the
valve 9 and to open the valve Ill. The kink 23
in the rod I1 is clearly visible in both positions, 30
above and below the spool body I4. In order to
move between these positions in response to the
movement of the crank I5 and a rotation of the
shaft I6, the rod I1 is bent back so that the apex
of the kink may pass over the cylindrical surface
of the spool body. Since both the rod I1 and the
rod I8 are made of bronze, or spring steel, the
force required to move the spool past the kink
is distributed between the two arms I‘! and I8, and
they are both bent outwardly, and both tend to 40
return to their respective normal positions.
Therefore, when the apex of the kink 23 passes
over the cylindrical surface of the spool body,
an unstable condition is created and the resil
iency of the rods tends to force the spool above, 45
or below the kink 23. This action necessitates
a slightly greater torque at the beginning of a
movement of the crank I5, but provides an addi
tional force at the end of such movement which
tends to drive the valves into their respective 50
positions. In this manner, therefore, a simple
over-center device is provided for moving the
valves into either of the two extreme positions
with a snap action, and thereby eliminating a
chattering or ?uttering of the valves during these 55
operations. On the other hand, a positive force
is required to initiate an operation thereof.
The above-described motion transmitting de
vice, although described as applied to the valves
provided with a spool having its axis substan
tially at right angles to said stem, a crank for
operating said valve comprising a pair of spaced
parallel and resilient arms engaging said spool
and the operating shaft of a gas meter, com
pn'ses a simple and inexpensive, yet rugged over
on opposite sides of its axis, and a tapered pro
jection on one of said arms projecting toward
center device capable of application to other
What we claim as new and desire to secure by
10 Letters Patent of the United States, is:
1. In a mechanical motion transmitting device,
the combination of an operated member provided
the other of said arms, said spool being moved
past said projection during each operating move
ment of said valve whereby an unstable condition
exists in any position of said valve except the 10
open and closed positions thereof.
4. In a dry gas meter, the combination of a
set of valves, a pair of valve stems arranged to
operate said valves to opened and closed posi
with a cylindrical surface and arranged to move
in a straight line between two end positions, an
15 operating member including a crank provided
with a pair of resilient members adjacent oppo
site sides of said cylindrical surface and arranged
to move transversely of said operated member
during its linear movement, and a tapered pro
20 jection on one of said resilient members arranged
to move past said operated member during said
transverse movement to force apart said spaced
members thereby creating an unstable condition
between the two end positions of said operated
25 member.
2. In a mechanical motion transmitting device,
snap action is obtained at the end of each move
the combination of an operating crank including
a pair of spaced resilient members, an operated
member between said spaced members provided
30 with a spool extending substantially between said
ment tending to quickly seat the valves in either
direction of movement.
5. In a mechanical motion transmitting device,
the combination of an operated member arranged 30
two resilient members, a tapered projection on
one of said parallel spaced members and project
ing towards the other of said members thereby
providing a reduced spacing between said spaced
35 members, and means for moving said crank
whereby said operated member is moved linearly
and said tapered projection is moved transversely
of said spool an unstable condition being created
until said projection has moved past said spool.
3. In a dry gas meter, the combination of a
valve, an operating stem therefor operable in a
straight line to open and close said valve and
tions respectively, a cross bar provided with a
spool connecting said valve stems for simulta
neous operation, a crank for moving said cross
bar comprising a pair of spaced resilient arms
engaging said spool on opposite sides of its axis,
a tapered projection on one of said arms pro- -
jecting toward the other of said arms said pro
jection being moved transversely of said spool
during each operating movement of said crank
whereby an unstable condition is created until
said projection moves past the said spool and a
to move in a straight line and provided with a
cylindrical surface, a slotted crank engaging said
surface on opposite sides thereof, a tapered mem
ber projecting into said slot, resilient means for
holding said member in the said slot, and means .'
for turning said crank whereby said projecting
member is moved transversely of said cylindrical
surface and provides a snap-action at the end of
the movement of the said operated member.
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