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Патент USA US2128164

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Aug. 23, 1938.
F,
H. RICHTERKESSING
2,128,164
RAIL OPERATED CIRCUIT CONTROLLER
Original Filed June 16, 1932
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FQANK H. QICHTEQKESSING
Que/(MW
Aug. 23, 1938.
F. H. RICHTERKESSING
2,128,164
RAIL OPERATED CIRCUIT CONTROLLER
Original Filed June 16, 1932
2 Sheets-Sheet 2_
"III-Inn’,
Fig. 3
l______
Fig. 5
FQANK H. Dxcm-EQKEssme
Patented Aug. 23, 1938
2,128,164
UNITED STATES
PATENT OFFICE‘
2,128,164
RAIL OPERATED CIRCUIT CONTROLLER
Frank H. Richterkessing, Louisville, Ky., assignor
to Nachod & United States Signal Company,
Incorporated, Louisville, Ky., a corporation of
Kentucky
Continuation of application Serial No. 617,506,
June 16, 1932. This application February 28,
1938, Serial No. 193,180
15 Claims. (Cl. 200—52)
This application is a continuation of applica
ment on its foundation, and the relation of the
'
tion, Serial Number 617,506, ?led by Frank H. foundation and instrument to the rail.
Figure. 3 is a sectional view taken along lines
Richterkessing on June 16, 1932, and entitled
3—3 of Figure 2; the terminal‘ block 38 being
“Rail operated circuit controller”.
This invention relates to rail operated circuit illustrated in full elevation.
controllers, sometimes referred to as track in
struments.
The primary object of the invention is to pro
vide a reliable and ef?cient instrument that is
101 operated by the vertical movement of the rail or
track, when a car or train is passing thereover.
Another object of this invention is to provide
a track instrument that is self-aligning with re
spect to the track so as to provide proper opera
151tion thereof irrespective of the position of the
track.
A further object of this invention is to provide
an instrument embodying a single contact mech
anism that is easily and readily set for controlling
‘is. either normally open or normally closed circuits.
A further object of this invention is to pro
vide an instrument having a separable housing
and a removable cover, whereby removing the
cover provides for usual inspection and mainte
_. nance, while separating the housing provides for
the complete removal of all operating parts, there
by providing for replacement of the operating
mechanisms Without disturbing the predetermined
relation of the instrument with respect to the
3,0, track.
A still further object of this invention is to pro
vide an instrument that will automatically ad
just itself and thereby compensate for variations
in track alignment, as effected by tamping of
35a‘: ballast, freezing and thawing of ballast, excessive
variation in rail de?ection, and any other varia
tion in track or rail alignment that may be pro
duced by variations in temperature, or variation
in train loads passing thereover.
Other objects of the invention will be apparent
from a consideration of the following description
made in connection with the accompanying draw
ings forming a part of this application, with the
understanding, however, that the embodiment
45w illustrated is by no means the only embodiment
that the invention may assume. Therefore, the
invention is not con?ned to any strict conformity
with the showing of the drawings, other than that
falling within. the scope of the appended claims.
In the drawings:
Figure 1 is a plan view of the instrument with
the cover removed, illustrating the relation of the
instrument to a rail or track.
_
Figure 2 is an end elevation of the instrument,
52b, illustrating the method of mounting the instru
Figure 4 is an enlarged detail of the‘ contact
mechanism and base, illustrating the relation
of the parts when the rail arm is lodged at one
end of its travel, while,
Figure 5 is a similar view of the parts shown
in Figure 4, illustrating the relation of the parts
when the rail arm is lodged at the opposite end
of its travel.
‘
Similar reference characters designate simi
lar parts throughout the several ?gures.
Referring to the drawings in detail, the operat
ing mechanism is illustrated as being entirely car
ried by a removable end plate l4 that is secured‘
to a support casing l0 through bolts 15; a seal
ing gasket l6 being provided between the end 20
plate [4 and support casing I 0. Thus, the end
plate l4 and support casing l0 combine to form a
housing for the instrument.
A removable cover
l3, shown only in Figure 2, serves to totally en
close the operating mechanism in the housing. 25
It is to be understood that the cover [3 is pro
vided with a ‘suitable gasket to prevent ingress' '
of water and dirt into the housing. As particu
larly shown in Figure 3, the longitudinal ‘walls
of the support casing H], which project from they 30
removable end plate M, are inclined toward the’
opposite end of the support casing, to provide
thorough accessibility of the contact mechanism
parts.
‘
Referring further to ‘Figure 3, it will be ob
served‘that the removable end plate l4 is'pro-"
vided with a hub ll projecting outwardly from
the housing, and a hub l8, in axial alignment
with hub l1, projecting inwardly into the housing.
A suitable bearing formed‘ in hubs l1 and 18 re 40
ceives a main operating shaft I9. At the inner
end of shaft I9, a disc 20 is permanently se
cured thereto, while, at the outer end, an arm 2|
is adjustably secured'thereto by means of a bolt
23, illustrated only in Figure 1. The arm 2| is 45
provided with any auxiliary removable clamping
strip 22, which is likewise held in place by bolt
23.
Thus, as illustrated in Figures 1 and 2, arm
2| and clamping strip 22, together with clamping
bolt 23, provide the sole operating connection be 50
tween the instrument and rail 24.
A contact mechanism base 25, made of insulat
ing material, is provided with an annular recess
freely receiving the disc 20; the operating shaft
l 9 freely passing through an aperture in the base
2
2,128,164
located centrally of the said annular recess. A
friction disc 26, located within the recess between
juxtapositioned faces of disc 20 and base 25, pro
vides a yielding connection between the aforesaid
dition without departing from the spirit of the
invention. Thus, it is immaterial whether the
lever 3| is regarded as rotating about stop pin
parts.
tionary in the present embodiment, the lever 3|
will be regarded as rotating about pin 28 for the
purpose of this description.
To provide a constant pressure between the
juxtapositioned faces of disc 20 and base 25, a
compression spring 21 surrounds the inwardly
projecting hub l8, and reacts between base 25
10 and end plate l4. This constant pressure obvi
ously establishes a uniform friction between the
disc 20 and base 25 through the medium of the
friction disc 26.
At this time reference is directed to the bev
15 eled annular recess 42, which is formed in the
outwardly projecting hub l1 concentric with the
bearing for shaft l9. A suitable packing ma
terial 43 is lodged in the recess 42, and is forced
into the recess by the adjacent face of arm 2|
20 by reason of compression spring 21. Thus, the
spring 21 in addition to establishing uniform
friction between base 25 and disc 20 through the
medium of friction disc 26, also provides constant
pressure on packing 43 to establish a uniform
25 and dependable seal around shaft I9, thus pre
venting the ingress of water and dirt at this point.
At the lower end of the contact mechanism
base 25, a stop pin 28, rigidly secured to the end
plate I4 by means of an insulating post 29, passes
30 through a relatively large hole 25a in the base.
Thus, the difference in diameter of the stop pin
28 and hole 25a determines the extent to which
base 25 may be rotated about shaft 19.
From the foregoing description it will be ap
35 parent that a vertical movement of rail 24 ro
tates shaft l9 by reason of the interconnection
provided by arm 21 and clamping strip 22. R0
tation of shaft l9 likewise provides rotation of
base 25 by reason of the frictional interconnec
41 tion provided by disc 20 and friction disc 26.
However, as hereinbefore pointed out, stop pin
28, engaging diametrically opposed surfaces of
the relatively large hole 25a, limits the extent
of rotation of base 25 in both clockwise and coun
ter-clockwise directions.
Therefore, since the rotational movement of
' base 25 is limited to a predetermined amount, it
will be obvious that downward movement of arm
2|, after the stop pin 28 engages one side of hole
3 250., will cause the frictional interconnection be
tween disc 20 and base 25 to yield, and accom
modate the excess movement by permitting the
disc 20 to slip on the friction medium 26. Obvi
ously, a similar operation is provided for an up
. ward movement of arm 2! in excess of the cor
28 or drive pin 25b. Since the stop pin 28 is sta
At the upper end of base 25, a contact pin 32
is rigidly secured thereto. A co-acting contact
33 is carried by a ?exible member 34, which is 10
secured to lever 3| by a screw 35 passing be
tween the bearing holes of pins 28 and 25b.
It
will be observed that screw 35 intersects a por
tion of pin 25b, and, while not particularly shown
in Figures 4 and 5 it is to be understood that 15
the pin 25b is notched at this point so that the
screw may pass therethrough. This construc
tion enables screw 35 to retain lever 3| in oper
ating position on pin 25b. In Figure 3 the con
struction and relation of pin 25b and screw 35 is 20
illustrated in detail.
Particularly observing Figure 5, it will be ap
parent that contacts 32 and 33 engage before base
25 engages stop pin 28, when the base is rotated
in the counter-clockwise direction. Similarly, by 25
observing Figure 4, it will be apparent that con
tacts 32 and 33 separate before base 25 engages
stop 28, when the base is rotated in the clockwise
direction. In Figures 4 and 5 the corresponding
reverse limit position of base 25 is indicated by
dotted lines.
As a means of assuring a definite time of en
gagement and disengagement of contacts 32 and
33, the lever 3| is provided with an upwardly pro
jecting extension, which engages the ?exible
member 34 adjacent contact 33. Thus, once the
extension is adjusted, as for instance by bending
the extension between drive pin 25b and the
upper end thereof, a de?nite relation is estab
lished between contacts 32 and 33. It will be
further apparent that the extension enables ini
tial tension to be given the ?exible member 34,
thereby further assuring the de?nite relation be
tween contacts 32 and 33.
Referring now to Figure 3, it will be observed
that the contact mechanisms previously de
scribed, are enclosed by a glass cover 44, which is
secured to end plate M by means of screws 45.
Thus, all of the working parts are carried by the
end plate l4 as a separable unit; which parts are
50
further protected by the glass cover 44. Accord
ingly, the glass cover provides for a thorough in
spection of the parts under operating conditions,
and adequate protection for the same, when the
end plate [4 is removed from the support cas 65
responding limited movement of base 25 in the
ing in.
reverse direction.
Referring to Figure 1, it will be observed that
?exible connecting wires extend from beneath
the glass cover 44 and terminate at terminals 36
and 31 of terminal block 38. While not illus— 60
trated in detail, it is to be understood that these
connecting wires pass through suitable conduits
in end plate 14 into the interior of the glass cover
Referring further to Figure 3, it will be ob
served that the cylindrical stop pin 28 projects
60 beyond base 25 to provide a pivot or fulcrum for
the contact lever 3|. A hole 30 in the lower end
of lever 3| provides a bearing therefor. A sec
ond hole in the lower end of lever 3|, spaced
slightly above hole 30, provides a suitable bear
ing for the drive pin 25b, which is rigidly secured
in base 25. As illustrated in Figures 4 and 5,
hole 30 is made slightly larger than the diameter
of stop pin 28. This construction is provided to
compensate for the small difference between the
centers of pins 25b and 28 that is encountered as
the base 25 is rotated from one extreme posi
tion to another. On the other hand, it is appar—
ent that the hole for drive pin 25b could be simi
larly arranged with a relatively close ?t between
hole 30 and pin 28 to provide for the same con
44 and connect contacts 32 and 33.
In this re
spect one. connecting Wire is connected to termi
nal 32 at the rear of base 25 through the medium
of terminal nut 32a, while the other connecting
wire passes through hole 250 in base 25, and is
connected to the conducting ?exible member 34
by means of screw 35. Accordingly, it is to be
understood that lever 3|, ?exible member 34 and
screw 35 are metallic, and not insulated one from
the other, therefore, no difference in potential is
encountered therebetween at any stage of their
operation.
3
2,128,164
In Figures 1 and 3, it will be observed that the
terminal 38 is secured to a raised lateral web
connecting the longitudinal walls of the casing
ID by means of screws 39 thereby providing a
chamber 4| in the forward end of the casing. It
will be further observed that a hole 40 is provided
in the base of casing Ill within chamber 4 |. This
construction provides for the admission of the
external cables through hole 40, and the sealing
10 of same by ?lling chamber 4| with a sealing com
pound after the cables have been connected to
terminals 36 and 31.
Observing Figure 4, it will be assumed that the
arm 2| projects to the left of base 25. There
16 fore, downward movement of rail 24 rotates shaft
IS in the counter clockwise direction, and,
through the medium of the friction clutch com
posed of disc 20 and friction disc 26 lodged in the
annular recess of base 25, base 25 similarly ro
20 tates in the counter-clockwise. direction. Coun
ter-clockwise rotation of base 25, through the
medium of drive pin 2519, provides clockwise ro
tation of lever 3| around stop pin 28. Obviously
counter-clockwise rotation of base 25 provides
counter-clockwise rotation of contact 32. There
fore, the aforesaid downward movement of rail
24 provides counter-clockwise rotation of contact
32 about shaft l9, and clockwise rotation of con
tact 53 about stop pin 28. Thus, the contacts32
and 33 are engaged by moving each one toward
the other. Accordingly, from the aforesaid de
scription, the arm projecting to the left of base
25 in Figure 4, corresponds with the showing of
the arm in Figures 1, 2 and 3, under which con
35 ditions the contacts are normally open, and
_
closed by the downward movement of the rail.
For the purpose of illustration, it will be as
sumed that the ratio of the various lever arms
provides a complete movement of base 25 with a
1/8” downward movement of the rail 24. Ob
viously. the downward movement of the rail is
normally greatly in excess of 1/8" when a train
passes thereover. Thus, the ?rst 1/3” downward
movement of the rail provides the complete
45 counter-clockwise rotation of base 25 and cor
responding operation of the contacts. At this
point base 25 will assume the dotted position of
Figure 4, which is the equivalent of the. solid line
position of Figure 5. Accordingly, further coun
ter-clockwise rotation of base 25 is prevented by
50
means of the relation between stop pin 28 and
hole 30 illustrated in Figure 5. However, further
downward movement of the rail 24 provides fur
ther counter-clockwise rotation of shaft l9 and
65 disc 20, under which conditions the disc 28 mere
ly slips on the friction disc 26, as aforesaid.
When the train passes beyond, the rail 24 moves
upwardly, and assumes a position practically cor
responding with its previous normal position
Thus, the
?rst 1/8" upward movement of the rail provides
60 prior to the train passing thereover.
a complete clockwise rotation of base 25 and cor
responding operation of the contacts. At this
point base 25 assumes the dotted position of Fig
65 ure 5, which is the equivalent of the solid line
positions of Figure 4. Accordingly, further
clockwise rotation of base 25 is prevented by
means of the relation between stop pin 28 and
hole 30 illustrated in Figure 4. However, further
70 upward movement of the rail 24 provides further
clockwise rotation of shaft l9 and disc 20, under
which conditions the disc 20 merely slips on the
friction disc 26, as aforesaid.
From the foregoing it is clear that after a cer
75 tain amount of rotation of base 25, additional ro
tation of shaft I9 is accommodated by allowing
disc 20 to slip on friction disc 26. Obviously,
therefore, the construction allows the arm 2| to
be rotated from one side of the instrument case
to the other.
In. the preceding illustration the arm 2| was
assumed projecting to the left of base 25 in Fig
ure 4, under which conditions a downward move
ment of the rail closed contacts 32 and 33. It
was further illustrated that, under this assump 10
tion the contacts illustrated their respective po
sitions while no train was passing thereover.
Likewise, Figure 5 illustrated the contacts in
their respective positions while a train was pass
ing thereover.
‘
15
It will now be assumed that the arm 2| is ro
tated 180 degrees so as to project to the right of
base 25 in Figures 4 and 5. Obviously, this re
verses the conditions encountered when the arm
projected to the left, as assumed supra. Thus, 20
with the arm 2| projecting to the right of base
25, Figure. 4 illustrates the conditions of the parts
while a train is passing over the rail, while Figure
5 illustrates the corresponding conditions after
the train has passed beyond.
25
Accordingly, when the arm projects to the
right of base 25, which is reverse to that illus
trated in solid lines in ‘Figures 1 and 2, the con
tacts are normally closed and disengaged by the
downward movement of the rail by moving each
contact away from the other. In Figure 2 the
reverse or “normally closed" position for arm 2|
is illustrated in dotted lines.
Accordingly, it has been shown that, by rotat
ing the arm 2| through 180 degrees, the instru
35
ment is converted from a “normally closed” to a
“normally open”, or vice versa. Therefore, a
single pair of contacts are susceptible of control
ling a closed or open circuit without altering or
changing the internal construction. or adjust 40
ments of the mechanism parts.
From the foregoing description made in con
nection with the accompanying drawings, it is
apparent that I have provided a track instrument
having a contact mechanism operated by a por
tion of the vertical movement of the rail, where
in the movement in excess of the required por
tion is accommodated by allowing such excess
movement to slip a friction clutch, and establish
an immediate operating condition to provide for
the proper operation. of the contacts immedi 50
ately upon reversal of the rail movement. Thus,
variations in relative rail positions due to thaw
ing, freezing, etc., is analogous to- excess rail
movement, and, accordingly, operation of the in 55
strument under various changes in rail positions,
automatically establishes the required operating
relation between the‘contact mechanism and rail
arm by reason of the particular organization of
the friction clutch and novel arrangement of the 60
contact mechanism. Furthermore, it is obvious
that the construction and arrangement of the
track instrument, allows for lateral and horizon
tal displacement of the rail as well as the afore
said vertical change without affecting, in any 65
manner, the proper operation of the instrument.
Having thus described my invention, I claim:
1. A switch instrument comprising, a stationary
support (W, M); a rotatable means (|9—22)
mounted on said support; a base (25) mounted 70
on said means and rotatable therewith; a con
tact (32) ?xed to said base at one side of the
axis of rotation of said base; said base having
an aperture (25a) therein at the opposite side
of the said axis of rotation; a stationary mem 75
4
2,128,164
ber (28) ?xed to said support and projected
through said aperture; an arm (3|) pivotally at
tached to said member, and carrying a contact
(33) for engaging said ?xed contact (32); a pin
(25b) ?xed to said base, and operatively asso
ciated with said arm between, the pivot thereof
and said axis of rotation, whereby rotation of
tively connecting said co-acting contact to said
member, for rotating said co-acting contact in a
said base in one or the opposite direction, moves
tively.
said ?xed contact and arm-carried contact
toward or away from each other, respectively.
2. A switch instrument comprising, a stationary
member (l0, M); a rotatable means (l9--22)
ary frame; a member rotatably mounted on said 10
mounted on said member; a base (25) mounted
on said means and rotatable therewith; a contact
15 (32) ?xed to said base at one side of the axis of
rotation of said base; an arm (3|) pivotally at
tached to the said member at the opposite side of
said axis of rotation, and carrying a contact ( 33)
for engaging said ?xed contact (32) ; a pin (25b)
?xed to said base, and operatively associated
with said arm between the pivot thereof and said
axis of rotation, whereby rotation of said base in
one or the opposite direction moves said ?xed
contact and arm-carried contact toward or away
25 from each other, respectively.
3. A switch instrument comprising, a stationary
direction reverse to the direction of rotation of
the said member so as to move the said co-acting
contact into or out of electrical engagement with
the said ?xed contact, when the said member is
rotated in one or the opposite direction, respec
'7. A switch instrument comprising, a station
frame; means for rotating the said member; an
arm rotatably mounted on said frame; a contact
?xed to said member and a contact ?xed to said
arm for electrically engaging the ?rst men
tioned contact; and means, operatively connect
ing said arm to said member, for rotating said
arm in a direction reverse to the direction of ro
tation of the said member so as to electrically
engage or disengage said contacts, when the said
member is rotated in one or the opposite direc
tion, respectively.
8. A switch instrument comprising, a station
ary frame; a member movably mounted on said
frame; means for moving the said member; an
arm movably mounted on said frame; an elec
mounted on said member; a base (25) mounted
trical switch operatively associated with the said
member and said arm; and means, operatively
connecting said arm to said member, for moving
on said means and rotatable therewith; a con
said arm in a direction reverse to the direction
tact (32) ?xed to said base at one side of the
axis of rotation of said base; an arm (3|) piv
otally attached to the said member at the oppo
site side of said axis of rotation, and carrying a
contact (33) for engaging said ?x'ed contact (32) ;
a pin, (25b) ?xed to said base, and operatively
associated with said arm between the pivot there
of movement of said member, when the said
member is moved in one or the opposite direction,
member ([0, I4); a rotatable means (19-22)
of and said axis of rotation, whereby rotation of
said base in one or the opposite direction moves
‘said ?xed contact and arm-carried contact
toward or away from each other, respectively;
and means (28), carried by the said stationary
member (ID) and engaged by the said base (25),
for limiting the rotation of said base in either
direction.
4. A switch instrument comprising, a stationary
frame; an element movably mounted on said
frame; means for moving the said element; a
contact fixed to said movable element; a eo-act
ing contact movably mounted on said frame for
thereby opening or closing the said electrical
switch, respectively.
9. A switch instrument comprising a station
ary frame; a contact member movably mounted
on said frame; means for moving said member;
a second contact member movably mounted on
said frame for electrically engaging the ?rst
mentioned contact member; and means, oper
atively connecting the said second movable con
tact member to the said ?rst mentioned movable
contact member, for moving the said second mov
able contact member into or out of electrical
engagement with the said ?rst mentioned con
tact member, when the said ?rst mentioned con
tact member is moved in one or the opposite
direction, respectively.
50 electrically engaging said ?xed contact; and
means, ‘cperatively connecting said co-acting
10. A switch instrument comprising, a station
ary frame; an actuating member movably mount
ed on said frame; means for moving the said
member; an actuated member movably mounted
contact to said movable element, for moving the
on the said frame; a contact ?xed to the said
said co-acting contact into or out of electrical en
actuating member, and a contact ?xed to the
said actuated member for electrically engaging
the ?rst mentioned contact; and means, oper 55
atively connecting the said actuated member to
the said actuating member, for moving the said
gagement with the said ?xed contact, when the
55 said movable element is moved in one or the
opposite direction, respectively.
5. A switch instrument comprising, a stationary
frame; a member rotatably mounted on said
frame; means for rotating the said member; a
contact ?xed to said member; an arm rotatably
mounted on said frame and carrying a contact
for electrically engaging said ?xed contact; and
means, operatively connecting said arm to said
member, for rotating said arm in a direction
65 reverse to the direction of rotation of said mem
‘oer so as to move said contacts into‘ or out of
electrical engagement, when the said member is
rotated in one or the opposite direction, respec
tively.
70.
6. A switch instrument comprising, a stationary
frame; a member rotatably mounted on said
frame; means for rotating the said member; a
contact ?xed to said member; a co-acting contact
rotatably mounted on said frame for electrically
75 engaging said ?xed contact; and means, opera
actuated member in a direction reverse to the
direction of movement of the said actuating
member, when the said actuating member is
moved in one or the opposite direction, thereby
moving the said contacts into or out ‘of electrical
engagement, respectively.
11. A switch instrument comprising, a station
ary frame; an actuating member rotatably
mounted on said frame; means for rotating said
actuating member; a contact mounted on said
member and rotatable therewith; a second con
tact rotatably mounted on said frame for elec
trically engaging the ?rst mentioned contact;
and means, operatively connecting the said sec
ond contact to the said actuating member, for
rotating the said second contact toward the ?rst
mentioned contact and into electrical connection
therewith, when the said actuating member is
2,128,164
rotated in one direction, and for rotating the said
second contact away from the said ?rst men
tioned contact and into electrical disconnection,
when the said actuating member is rotated‘in an
opposite direction.
12. A switch instrument comprising, a station
ary frame; a base rotatably mounted on said
frame; means for rotating said base; a rigid con
tact ?xed to said base at one side of the axis of
10 rotation of said base; said base having an aper
ture therein at the opposite side of the said axis
of rotation; a stationary member ?xed to said
support and projected through said aperture for
limiting the rotation of said base; an arm rotat
15 ably mounted on said member; a second contact
into engagement with the said base carried con
tact, when the base is moved in one direction,
and into disengagement, when the base is rotated
in the opposite direction.
14. A switch instrument comprising, a station
ary frame; a member movably mounted on said
frame; means for moving the said member; an
element rotatably mounted on said frame; means,
operatively connecting the said element to said
member, for rotating the said element in a direc 10
tion opposite to the direction of movement of the
said member; and electrical contacts operatively
associated with the said element and said mem
ber so as to be opened or closed, when the said
member is moved in one or the opposite direc 15
?exibly mounted on the said arm for engaging
tion, respectively.
the said rigid contact, the said second contact
being rotatable with said arm; and a pin ?xed
to said base, and operatively associated with the
15. A switch instrument comprising a station
ary support (l0, l4) ; amember I 9—22) rotatably
20 said arm between
of rotation of said
ible contact and
away from each
the pivot thereof and the axis
base, for rotating the said ?ex
said rigid contact toward or
other, when the said base is
rotated in one or the opposite direction, re
spectively.
13. A switch instrument comprising, a station—
ary support; a base rotatably mounted on said
support; means for rotating said base; a contact
?xed to said base at one side of the axis of rota
30 tion of said base; an arm rotatably mounted on
said support at the opposite side of the axis of
rotation of said base; a contact ?xed to said arm
for engaging the ?rst mentioned contact; a pin
?xed to said base between the axis of rotation
35 of said base and the axis of rotation of said arm,
said pin being operatively associated with said
arm, for moving the said arm~carried contact
mounted on said support; means for rotating the
said member; a base (25) mounted on said mem 20
ber and rotatable therewith; a contact (32) ?xed
to said base at one side of the axis of rotation
of said base; said base having an aperture (25a)
therein at the opposite side of the said axis of
rotation; a stationary member (28) ?xed to said 25
support and projected through said aperture for
limiting the rotation of said base; an arm (3|)
pivotally attached to said stationary member,
and carrying a contact (33) for engaging said
?xed contact (32); and a pin (25b) ?xed to said 30
base between the said axis of rotation and the
aperture in the said base and operatively asso
ciated with the said arm, for moving the con
tacts into or out of engagement, when the ?rst
mentioned member is rotated in one or the 35
opposite direction, respectively.
FRANK H. RICH'I‘ERKESSING.
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