U.S. patent number 3,666,900 [Application Number 05/113,645] was granted by the patent office on 1972-05-30 for push button switch operating means with improved joystick and cam structure.
This patent grant is currently assigned to Square D Company. Invention is credited to Richard C. Rothweiler, Carl B. Sohns, John A. Washburn.
United States Patent |
3,666,900 |
Rothweiler , et al. |
May 30, 1972 |
PUSH BUTTON SWITCH OPERATING MEANS WITH IMPROVED JOYSTICK AND CAM
STRUCTURE
Abstract
An operating arm pivotably movable selectively in opposite
directions along two mutually-perpendicular paths of movement about
an intermediate pivot point drives a sliding cam for operating
linear reciprocative operators of a plurality of self-restoring
switches by means of translating pins.
Inventors: |
Rothweiler; Richard C.
(Asheville, NC), Sohns; Carl B. (Whitefish Bay, WI),
Washburn; John A. (Milwaukee, WI) |
Assignee: |
Square D Company (Park Ridge,
IL)
|
Family
ID: |
27667955 |
Appl.
No.: |
05/113,645 |
Filed: |
February 8, 1971 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
886290 |
Dec 18, 1969 |
|
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Current U.S.
Class: |
200/6A; 200/17R;
200/557; 200/332.1 |
Current CPC
Class: |
G05G
9/04785 (20130101); G05G 2009/04777 (20130101); G05G
2009/04744 (20130101); G05G 2009/04707 (20130101); G05G
2009/04774 (20130101) |
Current International
Class: |
G05G
9/00 (20060101); G05G 9/047 (20060101); H01h
025/04 () |
Field of
Search: |
;200/6A |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Scott; J. R.
Parent Case Text
This application is a continuation of Ser. No. 886,290, filed Dec.
18, 1969, now abandoned.
Claims
We claim:
1. A switch operating mechanism and switch combination comprising a
supporting body, an elongated operating member pivotally mounted
intermediate its ends on said body and having an upper end portion
extending outwardly from said body, means on said body for
constraining said operating member for pivotal movement along two
mutually-perpendicular paths, a guide plate on said body positioned
at a lower end portion of said operating member for restricting
said pivotal movement of said operating member in one or both of
said paths, a base member positioned below the guide plate, a
slidable cam member slidably carried by the base member between the
base member and the guide plate and engaged by said other end
portion of said operating member for sliding thereby, means for
guiding the cam member for sliding movement along two
mutually-perpendicular paths corresponding to the paths of movement
of the operating member, a pair of pin-receiving openings extending
vertically through said base member, translating pins loosely
received in said pin-receiving openings and each engaged at their
upper end face by said cam, and a pair of switches positioned below
the base member and having self-restoring, reciprocable push
buttons respectively engaged by the lower end faces of the
translating pins.
2. A combination as in claim 1 wherein the means for guiding the
cam member comprises a pair of parallel-spaced slots in an upper
wall of the cam member and a plurality of spaced guide pins
depending from the guide plate, said guide pins being received in
said slots for guiding the cam member in one of its paths of
movement and engaging opposite side faces of the cam member for
guiding the cam member in its other path of movement.
3. A combination as in claim 1 wherein the means for guiding the
cam member comprises a cruciform-shaped recess in an upper wall of
the base member and the cam member is received in the recess.
4. A combination as in claim 1 wherein the lower face of the cam
member is provided with two camming areas each having three camming
elevations and so positioned that the camming areas respectively
engage upper end faces of the translating pins to provide three
operating positions for each of the pins selectively.
5. A combination as in claim 1 wherein the lower ends of the
openings in the base member have shouldered areas restraining the
translating pins within the openings while permitting their
lengthwise movement in response to movement of the cam member and
the self-restoring action of the push buttons.
6. A combination as in claim 5 wherein the base member comprises
separate upper and lower base portions held in face-to-face
engagement, the cruciform-shaped recess is in the upper wall of the
upper base portion, and a pair of upper openings in the upper base
portion are axially aligned with a pair of lower openings in the
lower base portion and constitute said pair of pin-receiving
openings extending through the base member, the lower openings are
of larger diameter than the upper openings, the translating pins
have lower enlarged portions of greater diameter than the upper
openings and said lower enlarged portions are received in the lower
openings.
7. A combination as in claim 1 wherein an indexing collar is
slidably received on the operating member above the guide plate,
the guide plate has a guiding recess in an upper wall surface
thereof, and spring means are provided for biasing the collar into
engagement with the recess thereby to restrict movement of the
indexing collar and the operating member along one or both of said
paths.
8. A combination as in claim 7 wherein the area around the guiding
recess is concave upwardly so that when the guiding collar is moved
selectively from an intermediate position toward the outer ends of
the guiding recess by movement of the operating member, the spring
means is compressed thereby to urge the indexing collar and the
operating member toward the intermediate position.
Description
This invention relates to improvements in operating means for
electric switches, and more particularly to a switch operator
mechanism having an operating arm or joy stick constrained for
selective pivotal movement from a central position in opposite
directions along two paths of movement at right angles to each
other for selective operation of a plurality of self-contained,
self-restoring switches of the push button type.
In prior operators of this type, a sliding cam which operates the
switches has been exposed permitting accumulation of dirt to
adversely affect the operation. In accordance with the present
invention, improved means are provided for guiding the cam, and the
cam is completely enclosed. Further any desired number of switches
may be operated. Standard switches may be used and a base member of
the operator is so dimensioned that a modular construction is
provided as will be described.
An object of the invention is to provide an improved switch
operator of the joy stick type.
Another object is to provide an improved joy stick switch operator
capable of operating any desired number of push button type
switches arranged with pairs of the switches in tandem.
A further object is to provide an improved joy stick switch
operator including a sliding cam arranged to cause operation of
self-contained switches by means of translating pins interposed
between the cam and the switch push buttons.
Further objects and advantages of this invention will become
apparent from the following description wherein reference is made
to the drawings, in which:
FIG. 1 is a sectional view of a switch operator in accordance with
this invention, the section being taken generally along the line
1--1 of FIG. 2;
FIG. 2 is an elevational view of the switch operator of FIG. 1
showing a plurality of switches attached thereto;
FIG. 3 is a perspective view of the underside of an operating cam
forming part of the switch operator of FIGS. 1 and 2;
FIG. 4 is a perspective view of the underside of a
maintained-contact, five-position guide plate that can be used in
the switch operator of FIGS. 1 and 2;
FIG. 5 is an exploded view of the switch operator of FIGS. 1 and 2,
including a pair of switches, but with some parts and details of
some parts omitted for clarity of illustration;
FIGS. 6, 7, 8, and 9 are perspective views of the uppersides of
various guide plates that can be used in the switch operator of
FIGS. 1 and 2; FIG. 6 being a momentary-contact, five-position
guide plate; FIG. 7 being a maintained-contact, five-position guide
plate; FIG. 8 being a momentary-contact, five-position guide plate;
and FIG. 9 being a maintained-contact, three-position guide plate;
and
FIG. 10 is a sectional view of a portion of a modified switch
operator including an OFF-point latch mechanism, the section being
taken along the longitudinal axis of the switch operator as in FIG.
1, but with the cutting plane for the section rotated about that
axis so as to intersect a body member of the switch operator as
indicated by the line 10--10 in FIG. 5.
Referring principally to FIGS. 1, 2, and 5, the switch operator
comprises a hollow metal supporting body member 10 having a
generally cylindrical upper portion 11 and a lower rectangular
flange portion 12. The body member 10 is shown as mounted on a
panel 14 by insertion from the lower side of the panel through an
opening therein. Different numbers of rubber-like gaskets 15 may be
placed between the flange portion 12 and the lower face of the
panel 14 to compensate for panels of different thicknesses. The
body member 10 is held in position on the panel 14 by a ring nut 16
which threads over the upper portion 11 of the body member 10. A
conventional locating ring 17 may be interposed between the upper
face of the panel 14 and the bottom of the ring nut 16 to secure
the body member 10 against rotation with respect to the panel 14.
Two cylindrical locating nibs 18 FIG. 5 depend from the bottom of
the flange portion 12 and have tapped openings for receiving screws
19 which maintain the parts of the switch operator in assembled
relation as will be described.
An upper wall portion 20 of the body member 10 has a clover-leaf
shaped opening 21 defining four recesses arranged in quadrature for
guiding an elongated operating member or operator arm 24 for
movement selectively along two mutually-perpendicular paths of
movement. A flexible dustproofing boot 25 has a lower lip portion
26 received in an annular groove in the upper portion 11 of the
body member 10 and an upper lip portion 28 received in an annular
groove in an enlarged upper portion of the operator arm 24.
Intermediate of its length, the operator arm 24 has a generally
spherical bearing portion 29 received within a journal defined by
aligned openings in two identical face-to-face positioned bearing
members 30 and 31, the upper bearing member 30 being held, in a
manner to be described, against an annular downwardly-facing
shoulder 32 formed on an inner wall of the upper portion 11 of the
body member 10. A generally spherical lower end portion 34 of the
operator arm 24 is received in a cylindrical socket 35 formed in
the upper surface of an operating cam 36, and an indexing collar
38, preferably formed of oil-impregnated sintered iron material for
a reason to be described, is slidably mounted along the operator
arm 24 above a selected one of a group of guide plates such as
guide plate 39 shown in FIGS. 1, 2, 4, 5, and 7. A spring 40 is
interposed between the indexing collar 38 and the bearing portion
29 and a conical spring 41 surrounds the spring 40 and is
interposed between the lower bearing member 31 and an annular
shoulder on the indexing collar 38. In addition to biasing the
indexing collar 38 against the guide plate 39, the springs 40 and
41 serve to hold the upper bearing member 30 against the shoulder
32 and, when certain guide plates are used, also serve as return
springs for the operator arm 24 as will be described.
The operating cam 36, which is positioned below the guide plate 39,
is slidably mounted in a cruciform-shaped recess 42 in a molded
upper base portion 43 having a pair of openings 44 through which a
pair of translating pins 45 extends. Four spaced guide pins 46
(FIG. 4) depend from the guide plate 39. The cam 36 is guided for
movement along one axis by reception of the guide pins 46 in
parallel-spaced slots 47 formed in the upper surface of the cam 36,
and is guided for movement along the other axis by engagement of
the guide pins 46 with opposing side walls 48 of the cam 36. The
inner walls of the recess 42 assist in guiding the cam 36 along
both axes of movement.
The translating pins 45 are slidably received, respectively, in the
openings 44 in the upper base portion 43 and in openings 50 in a
molded lower base portion 51, the base portions 43 and 51 together
constituting a base member of the switch operator. As best
illustrated in FIG. 1, the openings 44 and 50 are preferably
circular and are axially aligned, and the openings 50 are of a
greater diameter than the openings 44. A semi-circular shoulder 50a
at the lower end of each of the openings 50 prevents the associated
translating pin 45 from dropping out of its opening 50, and a lower
enlarged portion of the pins 45,cooperating with the narrowed
diameter of the openings 44, limits the extent to which the pins
can extend into the recess 42 in the upper molded base portion 43
thereby to prevent the pins 45 from interfering with the sliding
movement of the cam 36. The translating pins 45 engage respective
self-restoring reciprocable push buttons 52 of a pair of
self-contained switches 54 arranged by side-by-side relation as
best illustrated in FIG. 5.
The switches 54 are preferably of the general type disclosed in
Turnbull U.S. Pat. No. 3,336,455 issued Aug. 15, 1967. Each
comprises a hollow housing 55 enclosing a bridging contact (not
shown) which moves, in response to movement of its associated push
button 52, to engage or disengage from upper and lower pairs of
stationary contacts electrically connected to respective pairs of
terminals 56. Although the switches as heretofore described are
double pole double throw switches, they could, as will be apparent
to those skilled in the art, also be made in a single pole
configuration merely by omitting one of the pairs of stationary
contacts.
A description of one of the double pole switches 54 will suffice
for all. The push button 52 is biased outwardly to its extended
position by a return spring (not shown) contained within the
housing 55. In the extended or released position of the push button
52, the bridging contact completes the circuit between the upper
pair of stationary contacts. When the push button 52 is in its
fully depressed position, the bridging contact completes the
circuit between the lower pair of stationary contacts. At an
intermediate position of the reciprocable push button, neither pair
of the stationary contacts is engaged by the bridging contact. Thus
three distinct contact conditions corresponding to three positions
of the reciprocable push button 52 exist for each of the switches
54, as follows: a released position in which the circuit is closed
between the upper pair of stationary contacts, an intermediate
position in which the circuit is open; and a depressed position in
which the circuit is completed between the lower pair of stationary
contacts. As will later be described, the operating cam 36 effects
movement of the push buttons 52 selectively between each of the
three aforementioned positions.
The versatility of the joy stick operator is enhanced in that the
push buttons 52 of the switches 54 are exposed for access through
the bottom of their respective housing 55 thereby permitting, as
described in the Turnbull patent and as shown in FIG. 2, additional
switches 57, which are like the switches 54, to be mounted in
tandem below the switches 54 for concurrent operation therewith.
Additionally, one or more of the switches 54 or 57 may be provided
with means whereby its contacts open or close either early or late
with respect to the operation of a standard one of the switches. As
will be apparent to those skilled in the art, this may be
accomplished by altering the length of the push button 52 or by
changing the effective spacing between the stationary and bridging
contacts within the switch.
Although the operator arm 24 may be made in one piece, it is
preferably an assembly, as best shown in FIG. 5, having an upper
sleeve portion 24a press-fitted onto a lower stem portion 24b on
which the bearing portion 29 is secured by soldering. The operator
arm 24 has an axial bore 24c and an intersecting transverse bore
24d for a purpose to be described. The sleeve portion 24a is
threaded to receive a knob 58, and the rounded lower end portion 34
is formed on the stem portion 24b.
As shown best in FIG. 3, four projecting portions 60,61,62, and 63
extend from a bottom face 36a of the cam 36. The projecting
portions 60 and 61 are at one pair of diagonally opposite corners
of the cam 36 and the projecting portions 62 and 63 are at the
other pair of diagonally opposite corners. The projecting portions
60 and 61 have inwardly-facing camming surfaces 64 and 65, and
opposite end walls 66 and 67 of the cam 36 have outwardly facing
camming surfaces 69 and 70, the surface 69 being between the
projections 61 and 63, and the surface 70 being between the
projections 60 and 62. Thus, the cam 36 provides three camming
elevations for operation of the translating pins 45, one being on
the bottom surface of the projecting portions 60 and 61, a second
being at the bottom face 36a, and a third being at the outer edge
of the camming surfaces 69 and 70. Accordingly, the cam 36 is
operable to move each of the push buttons 52 of the switches 54 and
57 by means of the translating pins 45 selectively into the three
distinct positions mentioned above.
As previously described, the translating pins 45 are free to slide
within the confines of the openings 44 and 50. As illustrated in
FIG. 1, the lower end portion of each translating pin 45 terminates
in a flat surface against which the push button 52 of the switches
54 bear, the outward bias of the self-restoring push buttons 52
urging the translating pins into engagement at their upper ends
with the under surface of the operating cam 36. Thus, in effect,
the translating pins 45 act as extensions of the push buttons 52,
thereby causing the push buttons to be operated by the camming
surfaces 64, 65, 69, and 70 of the cam 36. But for the operating
cam 36, the push buttons 52 would assume their respective
fully-extended or released positions.
In the central or OFF position of the switch operator illustrated
in FIG. 1, both push buttons 52 engage the face 36a of the
operating cam 36 and thus are depressed to their intermediate
position so that all circuits of the switches 54 are open. By way
of illustrating the operation of the cam 36, it will be observed
that as the cam 36 is slidingly moved to the left from the position
shown in FIG. 1, the right hand one of the translating pins 45
will, under the self-restoring bias of its associated push button
52, follow the camming surface 69 so as to permit the right hand
push button 52 to assume its released or extended position.
Similarly, as the operating cam 36 is moved to the right from the
position shown in FIG. 1, the left hand one of the translating pins
45 will follow the camming surface 70, thereby permitting the left
hand push button 52 to assume a released position.
Movement of the push buttons 52 between their intermediate and
depressed positions is effected by movement of the operating cam 36
along a path normal to that which moves the push buttons 52 between
their intermediate and released positions. As viewed in FIG. 1,
this path of movement is into and out of the plane of the sheet of
drawing. Movement of the operating cam 36 normal to the plane of
the drawing and toward the viewer causes the camming surface 65 to
urge the right hand one of the translating pins 45 downwardly so as
to urge the associated push button 52 against its self-restoring
bias to its depressed position. In like fashion, sliding movement
of the operating cam 36 into the plane of the drawing and away from
the viewer causes the camming surface 64 (See (FIG. 3) to urge the
left hand one of the push buttons 52 against its self-restoring
bias to its depressed position. In this manner, selective movement
of the operating cam 36 from its central position to four positions
within the cruciform shaped recess 42 (FIG. 5) effects selective
operation of the switches 54 and the switches 57, if used.
Movement of the operating cam 36 in the recess 42 is caused by
movement of the lower end portion 34 of the operator arm 24. The
operator arm 24 may be selectively manipulated from its central or
OFF position, as illustrated in FIG. 1, to any of four distinct
positions determined by the clover-leaf shaped opening 21. The
lower end portion of the operator arm 24 is similarly guided in
complementary fashion by the inter-action of the indexing collar 38
with a clover-leaf shaped opening 39b in the guide plate 39, the
lower end portion of the indexing collar being urged into abutting
relationship with the edges of the opening 39b by the bias of the
springs 40 and 41.
By the use of the interchangeable guide plates illustrated in FIGS.
6 - 9, the switch operator mechanism can be assembled to provide
four different modes of operation, selectively. Three position or
five position operation may be provided with either maintained or
momentary operation of the switches 54. Each of the guide plates of
FIGS. 6 - 9 is proved with a pair of holes like the holes 39a of
the guide plate 39 which cooperate with the locating nibs 18 of the
flange portion 12 to insure proper orientation of each guide plate
with respect to the remainder of the switch operator mechanism. The
function and operation of each of the guide plates will now be
described.
FIG. 6 illustrates a guide plate 71 that provides momentary
contact, three-position operation. The guide plate 71 is provided
with a raised boss 72 having a curved recess 73 therein with an
elongated indexing slot 74 within the recess 73. When the guide
plate 71 is assembled in the switch operator mechanism intermediate
the flange portion 12 and the upper base portion 43, the lower
portion of the indexing collar 38 is guidingly positioned in the
slot 74. As is evident from FIG. 6, the indexing slot 74 limits
movement of the operator arm 24 to a single path of movement even
though the clover-leaf shaped opening 21 in the body member 10
would otherwise permit movement of the operator arm in two mutually
perpendicular paths. When the operator arm 24 is in its central or
OFF position, the indexing collar 38 is disposed at the bottom of
the recess 73 intermediate the ends of the slot 74. As the operator
arm 24 is moved in its path of movement to either side of the OFF
position, the indexing collar 38 is caused to slide along the
surface of the curved recess 73 in a path defined by the slot 74.
The recess 73 is concave upwardly so that as the indexing collar 38
moves in either direction from the OFF position, it is caused to
slide axially along the operator arm 24 in a direction to further
compress the spring 40. The bias of the spring 40 and the
cooperation of the indexing collar 38 with the curved recess 73
cause the operator arm 24 to return to its central position if the
operator arm 24 is moved in either of its two directions from the
OFF position and then released. The conical spring 41 also assists
in restoring the operator arm to its OFF position. To minimize
sliding friction between the indexing collar 38 and the guide plate
71, the collar 38, as previously mentioned, is preferably formed of
oil-impregnated sintered iron material. Thus, the guide plate 71
provides three-position momentary contact operation for the switch
operator mechanism.
The guide plate 39 of FIGS. 1, 2, 4, 5 and 7 provides five-position
maintained-contact operation for the switch operating mechanism.
For this purpose, the guide plate 39 is provided with the generally
quatrefoil shaped opening 39b defining four indexing slots 76-79
which are aligned with the recesses of the opening 21 in the upper
wall portion 20 of the body member 10. In operation, the indexing
collar 38 may be moved selectively into any one of the four slots
76-79 where it will remain because of interaction between the
indexing collar 38 and the guide plate, until forcibly returned to
the central or OFF position. This is accomplished in the following
manner. Because the indexing slots 76-79 are generally coplanar,
the indexing collar is urged, by the spring 40, to slide downwardly
along the operator arm 24 in a direction to permit the spring 40 to
expand as the operator arm is moved from its OFF position.
Conversely, in order to return the arm 24 to its central or OFF
position, the indexing collar must slide along the arm 24 in a
direction to compress the spring 40. Hence, if the operator arm 24
is moved from its central position to any one of the four positions
corresponding to the slots 76-79, positive force is required to
return the operator arm to the OFF position. In the OFF position,
the indexing collar 38 is seated at the center of the opening 39b
against the cusps defining the slots 76-79 where it is resiliently
retained by the springs 40 and 41.
The guide plate 80 of FIG. 8 provides five-position momentary
contact operation for the switch operator mechanism. The manner of
cooperation of the indexing collar 38 with the guide plate 80 is
similar to that described in connection with the guide plate 71 of
FIG. 6 in that the collar 38 is caused to follow a curved recess
81, thereby to permit the springs 40 and 41 to return the operator
arm 24 to its central position from any of its four operating
positions. In the guide plate 80, however, there is provided a
quatrefoil-shaped opening 82 having four indexing slots 83-86,
thereby to permit operation of the operator arm 24 to five
operating positions rather than the three positions of the guide
plate 71.
The guide plate 87 of FIG. 9 provides maintained contact operation
in a fashion similar to the guide plate 39 of FIGS. 1, 2, 4, 5 and
7, but when the guide plate 87 is used the operator arm 24 is
restricted to bi-directional operation from the OFF position in a
single path of movement. As illustrated in FIG. 9, a slot 88 has a
number of protrusions 88a over which the indexing collar 38 passes
as it moves from its central position to either of its operating
positions. The protrusions 88a define a seating portion
intermediate the ends of the slot 88 where the indexing collar 38
is resiliently retained when the arm 24 is in the OFF position.
As previously mentioned, the screws 19 maintain the switch operator
mechanism in assembled relationship. The screws 19 pass through
aligned openings in the lower base portion 51, the upper base
portion 43, and the selected 51, the upper of the guide plates and
are threadedly received in the tapped openings in the locating nibs
18, the heads of the screws being recessed in the base portion
51.
Referring now to FIG. 10, there is illustrated a modified operating
mechanism which includes an OFF-point latch assembly. In this
assembly, the hollow upper sleeve portion 24a and the bore 24c in
the lower stem portion 24b of the operator arm 24 accommodate a
releasing mechanism including a release pin or shaft 89 having a
larger diameter head 89a projecting into a recessed portion of a
knob 90 and an undercut lower portion surrounded by a helical
spring 91. A cross pin 92, slidable axially of the stem portion 24b
within the confines of the transverse bore 24d, rigidly couples a
bearing sleeve 93 to the release pin 89 and the release pin 89 is
normally biased by the spring 91 to position the side of the
bearing sleeve 93 centrally within the opening 21. With the release
pin 89 and bearing sleeve 93 in the position shown in FIG. 10, the
operator arm 24 is prevented from movement out of its central
portion; however, upon depressing the release pin 89 against the
bias of the coil spring 91, the release pin and bearing sleeve 93
are moved downwardly, whereby the operator arm 24 may be moved as
determined by the indexing slots of the selected one of the guide
plates 39, 71, 80 and 87.
Referring now to FIG. 2, it will be observed that the combined
thickness or height (measured vertically in FIG. 2) of the base
portions 43 and 51 is approximately equal to the height of one of
the switches 54. Such sizing of the base portions was purposefully
accomplished to enable users of this joy stick operator mechanism
to employ a modular approach in designing and building control
stations incorporating the mechanism.
* * * * *