Note: Descriptions are shown in the official language in which they were submitted.
BACKGRQUND OF THE INVENTION
Fiel,d of the Invention:
; mis inventlon relates to a switch structure ~or
pushbutton and rotary operation o~ ~witch blocks di~posed in
tandem linkage. i,
Description o~ the Prior Art:
- Electric swltche~ are commonly employed in clr-
cuits for controlling electrical apparatu~. Such ~witche~
;~ may be of the pushbutton type or ~he rotary type, and each
.:
;~` 20 type o~ swltch i~ often u~ed ln location~ wh~re accidental
or mistaken alteration of a particular electrical circuit
may have -8erious detrimenta]. con~equences. Example~ of such
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47,6~0
switches are disclosed in U.S. Patent Nos. 2,74~,210,
3,333,079; 3,511,955; 3,367,20~; 3,983,348; and 4,~52,582.
Some contact block assemblies have involved prob-
a lems of gradual deterioration of the movable and stationary
- contacts due to wear or arc burning~ The eventual result of
such deterioration is a failure of the contact block. This
is true notwithstanding the usual overtravel provisions for
most movable contact carriers. Accordingly, there has been
a need for a more satisfactory contact block assembly which ;
10 avoids deterioration due to the usual wear and arc burning
effects.
SUMMARY OF THE INVENTIQN
lt has been found in accordance with this inven-
tion that problems involved with prior existing switches may
` be overcome by providing a switch structure which is oper-
able either as a pushbutton or a rotary switch which com- -
prises an operator and at least one switch structure, the `
operat~r comprising a tubular housing and an actuator~ each
switch structure comprising opposite side walls, opposite
20 end walls, and opposite edge walls forming a switch chamber,
. movable contact operating means within the chamber and
` including a guided reciprocable plunger and a bridging
contact carrier movable in response to movement of khe
plunger,~each stationary contact means comprising a contact,
a conductor, and a terminal, one housing wall having a
conductor-receiving opening through which the conductor
extends, the housing having portions forming groove means
~ t
for holding the conductor in place within said opening, one
side wall of each unit comprising a tubular portion aligned
;
' 3o with similar portions of an àd;acent switch unit where ~ ~
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2~
47,620
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similar units are disposed in tandem, screw means in each
- tubular portion connected to screw means of an ad~acent
r,- unit, each tubular porti.on including a shoulder, each screw
-: means having an out-turned head surface engaging the shoul-
`.` der and the screw means of the switch unit ad~acent to the
operating unit being secured to the switch unit~ and the
side walls of the switch units in tandem being spaced from
similar side walls of another tandem assembly 5 and inter-
: connecting means on the facing side walls of the switch
... .
units and disposed in the space therebetween.
The invention also comprises an operator and at
least one switch structure, the operator comprising a tubu-
lar housing and an actuator, the actuator being movable
longitudinally and rotatably in the housing, an annular cam .:
on the actuator and a switch structure having a movable
contact operating member to effect opening and closing of a
circuit through the switch structure, said member comprising
a reciprocable plunger, the actuator comprising an annular
end zone engageable with a portion of the end of the plunger ~ -
to effect movement of the plunger when the actuator is moved
longitudinally against the plunger, the annular cam being
slidably mounted on the actuator to engage retraction of the ~
cam when the actuator is moved longitudinally~ the annular :``~-
cam having a cam surface engaging another portion of the end
of the plunger to effect movement of the plunger when the
actuator is rotated, means biasing the cam to the unre- -
tracted position of the actuator, and where there are two
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` switch structures mounted on the operator, each structure
having a reciprocable plunger engaging the cam and the . .:
3o actuator, and the actuator having at least one opening in
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47,620
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-~ said zone which is alignable with one of the plungers to
effect movement of said one plunger and no movement of the
other plunger when the actuator is moved longitudinally.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a vertical sectional view partly in
elevation of a switch embodying the principal features of - -
the invention;
Fig. 2 is a horizontal sectional view taken on the
line II-II of Fig. l; ,
; 10 Fig. 3 is a horizontal sectional view taken on the
line III-III of Fig. l; -~
`~ Fig. 4 is a horizontal sectional view taken on the -
,~ line IV-IV o~ Fig. l;
- ~
`~ Fig. 5 is an exploded view of the operating mem- ~
bers of the switch; ~`
Fig. 6 is a development showing the profile of the
operating cam when the switch functions in two modesj `-
;`~ Fig. 7 is a development showing the profile of the
cam when the switch functions in three modes;
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.` ~ 20 Fig. 8 is a development showing the profile of~
~` the cam when the switch functions in four modesj -
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Figs. 9, 10 and 11 are elevational views of vari- i
ous legend plates with which the switch handle may be used;
-~ Fig. 12 is a vertical sectional view partly in ;
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~; elevation of another embodiment of the switch;
Fig. 13 is an exploded view of the operating parts
of the switch shown in Fig. 12;
i Flg. 14 is a horizontal sectional view taken on
~` the line XIV-XIV of Fig. 12;
Figs. 15 and 16 are alternate positions o~ the
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~ 6Z~ 47,620; 47,~95; 47,696
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` switch as shown in Fig. 14;
Figs. 17, 18, 19, and 20 are fragmentary vertical
~; sectional views, partly in elevation, showing various ~unc-
tions of the actuator;
Fig. 21 is a horizontal sectional view taken on
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the line XXI-XXI o~ Fig. 1;
~ Fig. Z2 is an elevational view with a portion
; broken away showing the ~elative positions o~ a pair of
~l~ contact blocks; "
v 10 Fig. 23 is an end view taken on the line XXIII- ~ :;
XXIII in Fig. 2 o~ a contact block with an additional upper
contact block added in tandem; and ;
Fig. 24 is a horizontal view partly in section and
.~ partly in ele~ation taken on the line XXIV-XXIV of Fig. 23. ~`~
;~ DESCRIPTION OF THE PREFERRED EMBODI ~ TS ~;
In. Fig. 1 a switch is generally lndicated at 25 `~
and is mounted on a panel 27. The switch 25 comprises an
operating unit 29 and palrs of contact~blocks 31, 33 in ~-
tandem. ,The operating unit~29 comprises a housing 35, a
20 clamp rlng 37, a handle or actuating kno~ 39, a contact ~`"
actuator 4~1, detent means or de~ent cam 43, and an operating
cam;45. m e housing 35 is a tubular m~ember including a
reduced portlon 47 which extends through an aperture in the
panel 27~and which comprises a threaded upper end portion 49 ;-~
- ~ on which~the clamp ring 37 i~ tightened for engagement wlth
the panel at 50. A legend plate 51 is disposed on ~he panel
27 and around~the clamp rlng 37.
The~handle 39 is composed of an electrioally
` insulating material; and is pre~erably translucent to trans-
mit light ~rom a light source or bulb~53. The handle 39
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~ 20; ~7,695; ~7,69
comprises a tubular por-tion 55 which is detachably mounted
on the upper end of the contact actuator 41. As shown more
particularly in Fig. 5, the tubular portion 55 co~prises an
end surface 57 and a pair of ears 59, 61 extending radially
inwardly from the inner surface of the portion 55 and having
end surfaces allgned with the end surface 57. The ears 59.
61 are not diametrically opposed, rather the arc between
them on one side is greater than on the other. In addi-tion,
the tubular portion 55 includes a first pair of outwardly ~`
; 10 extending stop ribs 63, 65 having end portions 64, 66 which
project beyond the end surface 57. me circular arc between
the ribs 63, 65 on one side is greater than the arc on the
other side thereof. Finally, the tubular portion 55 also
includes a second pair of stop ribs 67, 69 which are wider
`: than the ribs 63, 65, and which project beyond the end
surface 57 by a distance 71 equal to that of the ribs 63, 65.
The tubular portion 55 also has spaced notches 73 to permit
contraction of the portion 55 as it is snapped into and out
of place on the contact actuator 41 when repositioning the
handle from one mode to another.
The contact actuator 41 (Fig. 5) has an upper end
. portion which is annular and includes a radial flange 75, as ;`
well as a lower portion which is splined9 that is, it com-
`~ prises a plurality of radially spaced grooves or slots 77
which form a~u~berof longitudinal member379, the lower
ends of which include outturned flanges 81. The detent cam
43 is annular and is mounted on the lower portion of the
contact actuator 41 where it is movable against a coil
spring 83 (Fig. 1) between the actuator 41 and the housing
30 35. The detent cam 43 (Fig. 5~ includes a plurality of
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~ 2 0 47,620; 47,695; 47,696
spaced cam notches 85 in which a pair of diametrically
opposite cam detents 86 (one of which is shown) operate.
The cam detents 86 are part o~ the actuator 41 and extend
radially therefrom. The detent cam 43 also includes a
pair o~ diametrically opposite grooves or notches 87 ~one
`~ of which is shown) in which opposite cam guides or guide
ribs 89, 91 are located, which guide~ extend longitudinally
upon the lnternal surface o~ the housing 35 and enable the
detent cam 43 to move longitudinally without rotating~ The
.~ 10 guides 89, 91 are also shown in Figs. 3 and 4.
; As shown in Fig. 5, the upper end of the contact
~; actuator 41 comprises a plurality, such as three, notches
:
93, 95, 97 in which the ears 59, 61 are detachably located,
, depending upon whether the switch is operated in two, three
~i or four modes or positions. For example, to turn the switch
between two modes, the ear 59 is disposed in the notch 95
; with the ear 61 in the notch 97. To operate the switch in
three modes, the ear 61 is located in the notch 93, while
the ear 59 is in the notch 97. To operate the switch in
four modes, the ears 59, 61 may be in either notch 93, 95, ~-
~ or 97 because, as explained below, the end portions 64, 66
;; corresponding to the projection distances 71 of the several
ribs 63, 65, 67, 69 are removed.
- The switch 25 is operated through the two, three,
,: .i and ~our modes as shown in Figs. 6, 7, and 8, respecti~ely.
For two modes (Fig. 6) the handle 39 is rotated to turn the
actuator 41 and the cam detents 86 from specific notches 85a
to notches 85b, whereby the handle turns from OFF to ON, as
shown in Fig. 9. me ribs 63, 65 limit the movement o~ the
handle because in the OFF position, the rib 63 abuts the
upper end of the guide
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47,620; 47,695; 47,696
89; and in the ON position the rib 65 abuts the guide 89 on
-` the opposite side thereof. Accordingly, the ribs 63, 65 incooperation with the guide 89 limit movement of the handle
between two positions ON and OFF, when the ears 59, 61 are
properly disposed in the corresponding notches 95, 97.
-.` For three mode operation, the handle 39 is reposi-
; tioned with respect to the notches 93~ 97 so that the stop
ribs 67, 69 are in the solid line positions as shown in Fig.
; 7, whereby the rib 67 is in abutment with the upper end
` 10 portion of the guide 89 so that the handle moves the detents ~ ;
86 from notches 85a to notches 85b and subsequently to
notches 85c. Thus, the stop ribs 67, 69 move from the solid
~`.;` line positions to the broken line positions until the rib 69
confronts the other side of the guide 89. Thus, as shown in
` Fig. 10, the handle may be turned between the positions `
. HAND, OFF, and AUTO.
~` To operate the switch in four modes, the lower end
~ portions 71 ~Fig. 5) of the several ribs 63, 65, 67, 69 arei removed or cut orf so that none of the ribs con~ront the
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20 upper end portion of the guide 89 as shown in Fig. 8.
Accordingly, when the handle 39 is rotated, the detents 86
move between the four notches 85a, 85b, 85c, 85d where they
are limited by the guide 89. In addition to the guide 89, a
~ portion 99 of the detent cam 43 (Fig. 5~ projects into the
path of the cam detents on diametrically opposi~e sides o~
the cam and align with the guides 89. Accordingly, as shown
in Fig. 11~ the handle 39 may be rotated between the four
` positions ~ncluding ON, OFF, RU~, JOG.
Another embodiment of the switch is generall~
indicated at 101 in Fig. 12 in which, for simplification, ~ ;
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~ 3.~ 7,~20; 1~7,695; l~7,696
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~- similar reference numbers re~er to similar parts shown in
Fig. 1. The operating uni-t 29 comprises a handle 103 which
includes a tubular portion 105 and stop means comprising a
projection or flange 107 extending from one side thereof.
A tab 109 (Fig. 13) projects from the tubular portion 105
~ and is peripherally spaced from a radial flange 111 which ~s
;` less on one side than on the other; that is, the tab 109 and
.;~` the radial flange 111 are not diametrically opposed. The tab
~ 109 preferably includes an indicator mark, such as an arrow
- 10 113. ~he reduced portion 47 of the housing 35 (Fig. 12)
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;~; includes a pair of diametrically opposed guide ribs 115 and 117
which are s~bstan~i`ally~slmilar to:~he:guide rib~ ~9~ 9l (~igo 1~9
but which differ there~rom in that the guide 117 has a lower
surface 119 (Fig. 14) and a projection 1Z1 extending to the
level of the upper end of the guide 115. The projection 121
includes stop edges 123 and 125 for limiting rotation of the
~: handle 103.
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The contact actuator 41 (Fig. 13) is provided a
pluralit~, such as three, tab-recei~ing notches 127, 129,
131 facing the t~p surface of the actuator, as well as three
slots 133, 135, 137. When the tab 109 is placed in o~e of ~ .
the notches 127, 129~ 131, the radial ~lange 111 fits into
one of the corresponding slots 133, 135, 137. Accordingly,
when the handle 103 is rotated, the force o~ turning is
shared by the tab 109 and the ~lange 111. To facilitate
placement of the tab 109, the indicator mark 113 is placed ~ ~.
in the appropriate notch having the desired mode or position : :
~ number, such as 2, 3, 4, as shown. .:
m e manner in which the several parts o~ the handle
103 and the notches and slots of the contact actuator
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L!7~620; 47,695; 1~7,696
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! 41 operake is shown in Figs. 14, 15, 16. For two-mode
;, operation (Fig. 14), the tab 109 is placed in the notch 127
having the identification "2" with the radial flange 111
-~ fitting into the slot 135, whereby the flange 107 is dis
.
~ posed over a peripheral sector of the actuator 41. To
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illustrate the several parts 107, 109, 111 in Figs. 14, 15,
16, these parts are indicated by stippling which has no
reference to the kind of material invol~ed. Thus, the
handle 103 is rotated between the OFF and ON positions, as
shown in Fig. 9, with the flange 107 moving to the broken
line position (Fig. 14), the tab 109 and notch 127 moving to
their respective broken line positions, and the detent cam
86 moving to its broken line position. In the broken line
position of flange 107 no further rotation is possible -~
because the flange 111 strikes the guide 115 at the surface
139. When the handle is rotated in the reverse direction,
the cam detent 86 strikes the ~K~ guide 115 at the stop
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surface 141, and the diametrically opposite detent cam 86
strikes the stop edge 125 of the projection 121 simultaneously.
. 20 For three-mode operation ~Fig. 15), the tab 109
and the flange 111 are placed in the notch 129 and slot 133,
respectively, which notch is identiried with the number "3". ~ ;
In that position, the cam detents 86 are against the stop
` surfaces 125 and 141; and the handle is rotated clockwise
from a first position A to a second position B, or to a
third position C through arcs of appropriate angles, such as
. :
. 45 degrees each. When the tab 10~ reaches the broken line
position 109, the flange 107 strikes the stop surface 123 :
` and prevents further rotation. As the flange 107 approaches
30 the stop surface 123, it clears the surface ll9 of the guide
1 0 - ,,
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~ ~ 62 ~ 7,620; ~7,695; 47,696
117.
When -the operating unit 29 is used Por four-mode
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- ~ operation, it is necessary to remove, such as by eut~ing, a
~i~ lower portion 143 of the flange 107 along a line, such as
indicated by the broken line 145 (Fig. 13). To facilitate
~` removal of that portion, a breaking groove may be provided
~ i
`; at the line 145. With the lower portion 143 removed, the
flange 107 no longer collides with the projection 143 when
; the handle is rotateda However, the tab 109 and the flange
-- lO 111 are pre~erably placed in the notches 131 and slot 137,
respectively, so that an indicator, such as an arrow 147
r~7,' (Fig. 11) points to the appropriate position, such as ON~
OFF, RUN, JOG on the legend plate 51. The limits to the
~; rotation o~ the operating unit 29 are then provided by the
cam detents 86 (Fig. 16) which are stopped when they collide
with the guides 115, 117. In this manner, the handle is
turned through four positions through three arcuate sectors
of suitable degrees, such as 45 degrees, each, until the tab
; 109 and the notch 131 reached the broken line positions
thereof.
Rotation o~ the operating unit 29 with either the
embodiment of Fig. 1 or Fig 12 9 rotates the operating cam
45 through the indicated modes to open or close the circuits
i through the contact blocks 31, 33. As the operating cam 45
is rotated, it actuates s~itch operating plungers 149, 151
in various combinations of UP and DOWN positions, depending
upon the cam sur~ace. The contact blocks 31, 33 may be
disposed in tandem (Fig. 12) with at least two blocks in
position.
- 30 In accordance with this invention the blocks 31,
` 32 may be disposed in side-by-side positions (F'ig. 22) with
their respective
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~ 47,620; 47,695; ~17,696
plungers 1ll9, 151 engaging the cam ll3. Each con'cact block
contains a pair of movable contacts 153 and a pair of sta-
tionary contacts 155. The movable contacts 153 are mounted
on a bridging contact carrier 157 which in turn is mounted
on the plunger 151 in a conventional manner, such as shown
in Patent No. 3,919,506. Each contact block is adjusted for
either normally open (as shown) or normally closed condi-
tions. Each contact block 31~ 32, 33 includes a pair of
similar contacts 153, 155, con'cact carrier 157, and plunger
151 or 149 which are disposed in a contact chamber 159
formed by a pair of opposite side walls 151, 162, opposite
end walls 165, 167, as well as top and bottom opposite edge
walls 169, 171. To facilitate assembly, the side wall 161
and end walls 165, 167 constitute a cover and are separable
from the body portion which comprises the side wall 162 and
the upper and lower edge walls 169, 171. When assembled,
suitable means (not shown) maintain the cover and body ;
portions intact. ~
As shown in Fig. 22, the stationary contacts 155 ~`
are mounted on a terminal connector 173 which has a gener~
ally Z-shaped configuration comprising an inner end portîon
175, an outer end portion 177, and an intermediate portion
179. The outer end portion comprises an assembly of a ;
terminal screw and clamp 181 to which a flexlble conductor
(not shown), such as a stranded wire, is attached.
:~ :-
In Fig. 22, the intermediate portion 179 is dis-
posed between the side wall 162 and a wall portion or flange
183 which is spaced at 185 by a distance substantially equal
to the thickness of the intermediate portion 179. The wall
portion 183 is comprised of an electrically insulating
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L~7,620; Ll7,695, 47,696
material similar to the walls forrning the several contact
blocks 31~ 32, 33 and serves as an insulating barrier to
prevent any arc1occurring between the contacts 153, 155 from
moving from the stationary contact 155 to the intermediate
portion 179, which is closer to the movable contact 153 when
it is in the open position. Thus, the wall portion 183
facilitates in terminating any arc occurring during separa-
tion of the contacts.
The terminal connectors 173 are retained in the ~`
position shown in Fig. 24 by the end walls 165, 167 when the
body and cover portions are completely assembled.
Although the contact blocks 31, 32, 33 are pro-
vided with integral interfitting members including prongs
187, which engage cooperating recesses 189 to retain the
blocks in tandem, the blocks are also provided with tubular
portions forming bores 193 adapted to receive screws i95.
Each screw 195 comprises a threaded sha~t 197 and a head
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199, which head engages a reduced shoulder surface 201 (Fig.
~` 23). Each head 199 comprises a threaded bore 203 in which
20 the end portion o~ the shaft 197 is secured to the next
adjacent screw 195. The uppermost screws of a pair o~
' tandem mounted contact blocks are attached in a suitable
-`~ manner, such as to threaded apertures in the lower side
the housing 35. ~ ``
When a sufficient number of contact blocks 31, 32,
33 are connected in tandem and secured in place b~ an elong-
~ ated series of screws 195, the contact blocks o~ adjacent
`,``! stacks or tandems are inclined to separate outwardly due to
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the force applied by the screws. As a result, ad~acent
30 pairs of contact blocks in the spaced tandem stacks are
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Ll7,620, 47,695, 47,696
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provided with laterally interconnecting means, such as
cooperating hooks 205, 207, of which a pair extend from each
pair of spaced blocks 31, 33 (Fig. 24). Thus, the hooks
```- 205, 207 maintain a pair of tandem contact blocks in the
desired spacing with respect to each other and in alignment
with the operating unit 29.
The manner in which the operating cam 45 is mounted ;
on the lower end of the contact actuator 41 is shown in
Figs. 17-20. The cam 45 is an annular member having cam
surfaces 209, 211 (Fig. 1) and mounting spokes 213 (Fig. 5).
As shown in Fig. 21, the spokes are disposed in the grooves
77 between the several longitudinal members 79. Thus, when
the contact actuator 41 is rotated, the cam 45 rotates to
actuate one or both plungers 149, 151, such as shown in Fig.
17. However, where the handle 39 or 103 is operated as a
~r~ push button instead of a rotary selector switch, the-actuator `
B is moved in the direction o~ the arrow 215~to9depress both
plungers 149, 151. The operating cam 45, however, remains
in its position because the spokes 213 slide in the slots
77. As shown in Fig. 21, the upper ends of the plungers
~- 149, 151 overlap the surfaces of the cam 45 and the flanges`- 41 at the lower end of each longitudinal member 79. Accord~
ingly, the plungers 149, 151 are actuated by either or both
o~ the cam and longitudinal members.
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Finally, where necessary, one or more of the lon-
gitudinal members 79 may be eliminated, such as shown in
` Fig. 19 on the right-hand side, thereby removing one of the
flanges 81 which overlaps the plunger 149. Thus, when the
actuator 41 is depressed in the arrow 215 (F'ig. 20 ~, the `
~ 30 plunger 151 is depressed, but the plunger 149 remains in the
~ ~` upper position.
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