US2330461A - Safety switch - Google Patents

Description

C. WANTZ SAFETY SWITCH Sept. 28, 1943.

Filed May 31, 1941 2 Sheets-Sheet 1 l JL Sept. 28, 1943. c. WAN-rz I SAFETY SWITCH med may s1. 1941 2 Sheets-Sheet 2 il?, AJ0 66 fraz/enivre Cfenc'e Wm.

y 12m/u f Patented Sept. 28, 1943 UNITED STATES PATENT OFFICE 2,330,461 v 4 SAFETY swrrcn Clarence Wants. Milwaukee, Wis.; assixnor to Milwaukee Gas Specialty Company, Milwaukee, Wis., a corporation of Wisconsin This invention relates, generally, to protective devices for burner apparatus, and it has particular relation to a safety switch adapted to be con.- trolled by condition responsive means and operative to prevent the escape of unburned fuel.

While the particular device which I shall describe hereinafter inv connection with the drawings is a safety switch, operative topause a valve in the fuel supply -pipe'leading in a. burner to close whenever a flame to which the device is responsive. as a pilot llame, goes out, it is to be understood that the invention, in its broader aspects, is not limited to this particular use but may be employed I n all similar work suitable or desired.

Moreover. while I have shown and shall describe the switch of the present invention in connection with a valve that requires current yonly for opening the same, the invention is not limited to use with valves of this particular type, but may beemployed with valves that require current for both opening and closing the valve. and it is to be understood that the switch may be used for controlling other circuits and other devices than the particular circuit and partlcular-device selected for illustration.

- One of the main objects of the. invention is to provide an improved form of switch embodying a simple and improved mode o1'y operation for opening the circuit into which the switch is connected. for example, upon extlngulshmentpf the llame to which the deviceis responsive, or upon the occurrence of some other 'abnormal condition or malfunctioning of the'apparatus: also a simple and improved mode-of operation which will permit resetting the switch to closed position only when the flame 'to which the device is responsive Y is burnlngor when the other abnormal condition cr malfuncticning of the apparatus is cured.

another object oi' the invention is to provide a switch of the character described which. is `oi' simple. inexpensive, and improved construction embodying few parts and operative effectively to accomplish the purposes set forth.

Another object of the invention is to provide. in a switch of the charactendescribed, simple and improved means for indicating the position of the switch.

While the Vparticular structural features and combinations by which I obtain a device of the .character set forth are important features within the more specific aspects of the invention, it is to lac understood that the precise features shown and described may be varied within the broader ascects of tho invention.

In order to acquaint those skilled in the art with the construction and operation of a safety switch embodying tu present invention, I win' now describe..ln connecti with the .drawi'nsa ,one prelerrcd'embodimen otthe z Flsure 5 isaifrasmentary detail the position ofthe switch, achiatorfend reset.

meanswith the; switch in the reset stem and reset member released:-' and Figure 8 isa view similar to-Figure 6 chcwins i the position of the'switch actuator andreset cock or reset the device. a

means with the'reset'armpressed inwardly to In Figure Roi'the drawnls. il 85s or-othcriuel burner of any mitableor preferredtypeis converitionallyV illustrated at; burner-l0 be the burner of a xfooxnoxI heater. door furnace." gas or-y any-other burner. A gas or other fuel lllwlypipe -I l leads to thcburner llforthedeliveryof gas or other fuel example', aymlxlng chamber (not shown)V to which amittedin theusual way. as well understoodin the art.

A power actuated or elcctroresponsive valve I7. suoli` as 'Solenoid or motor valve. is interposed in the fuel supply pipe Ii.r-,l'lieval,v`e Illa shown as comprising avalvebodyl! Vand ahoodil havin?4 suitable power'xoperfated" valve actuatlngxmeans -thereim- A- stepfdown transformer-l5 supplies power' furthe-operation oi'"thevalv`e. l2;` This transformer comprises aline-voltageprimary I6 anda low voltagesecondary I'Lj 'The primary V or operative energy to the burner l0 aslong as' the circuit I9 is closed. The valve l'may have spring means. or other suitable means, for actuating the valve to closed position to shut oil view showing the lin with burner `ing hutton 32.

the supply o! fuel to the burner IU when the circuit I9 is opened orotherwise disabled.

The control switch of the present invention is shown as located within a housing 20. The opposite Vends of the back Wall of the housing are turned in to form end walls 2|, and at the opposite sides of the back wall are lnturned iianges 22. The cover 23 is of generally U- shaped cross section and lits over the inturned end walls 2i with the inner marginal edges of the sides of the cover fitting over the flanges 22. Slots 24 opening inwardly from the inner marginal edges of the side walls oi the cover rit over the shanks of screws 25 which are adapted to be tightened to secure the cover in place on the base of the housing and to be loosened to permit removal of the cover.

'I'he front wall of the cover 23 has an opening 26 through which an indicator is adapted to be viewed to indicate the position of the switch, as will hereinafter-appear. v An Iactuator or'reset member 30 operates be tweenzfopen and closed positions by rectilinear movement. through an opening 3l in the adjacent end wall 2| of the housing. The outer end of the actuatormember 3D is provided with an operat- 'I'he-inner end of the actuator or reset member 30- is turned toward the back -wail ofthe"housing.A and at the back wall of the `housing'theactuator member-is turned at substantially rightangles at 34 for sliding move- -rnent on= the back wall'of the-housing; A rivet 35 retains the adjacent angular end 34 of the factuatoimember onthe back wall of the housing, and the shank .ofthe-rivet" 35- passes :fthrough :an elongated slot 36 in'the angular end v34 oftheiactuatormemberrto permit the rectilinear sliding 'movement of this'rrnember; Theaetuator-member 30 is yielding'ly retained y' iny itsV outwardly kproiectedfposition as shown in Figures 1 and 5,'and, upon release ofthe button 32, '.as'will presentlyappear. is returned to this outwardly projected position by a coiled spring 38 connected betweenthe rearwardlyturned initermedlate portion vof the V'actuator member and `sarsprlng anchoring-lug Ils-'pressedfinwardly from f-the adjacent end wall-2i1 of 'the housing. The

'screws-25am! slots 24-maybev positioned at dif- 4ferent distances-from the-opposite ends of the ""dev'lce tofA assure fproperfmounting of the cover '23, ilPivote'dat-'l on the actuatorxor reset mem- I switch closed is 'isho'wnin the-form of anelectromagnet located within" Y-the housing ,2il.f'Theelectromagnet selectedl for 'illustration comprises amagnet A1franie`i`4Sesecured.' mrezramplel to"a terminal Ibushing--W'in'the manner more fully disclosed Yrinfmy 'copendinrfapplication Serial No. 328.923. Jedpril' 10. 1940.- The-coil 4l of the electromagnet is-woundjaroundthe legs ofthe magnet Aframe 45'. The bushing-`46 isshown as splayed to the pole ends of the magnet frame 45. The electromagnet and armature are enclosed within a cup 58. The stem 51 extends for reciprocatory movement through an opening 59 in the inner end of the cup 58. The opening 59 is sealed by suitable sealing material, such as a leather washer. felt packing or the like, as indicated at 60, interposed between the inner end of the cup 58 and a spring seating disc 62.

The end of the stem 5l opposite the end on which the amature 55 is mounted is secured by a pin 64 to the adjacent end of a reset stem 65., The opposite end of the reset stern 65 is pivoted, for example, by a screw 66 to one arm of the lever 42 on one side of its pivotal attachment at 4|) to the actuator member 3U. The reset stem B5 is oi square or polygonal section, with a rounded or cylindrical end tting into a valve spring seat member 68. 'A coiled spring l0, interposed between the spring seat member 6B and the spring seating disc 62, actuates the armature 55 to retracted position and the reset stem 65 and pivoted lever 42 to the position shown in Figure 5 when the electromagnet is de` energized. for example upon extinguishment of the llame to which the device is responsive.

The particular switch shown in the drawings comprises a-switch base 'l5 in the form` of a block of suitable insulating material closed at the front and hollowed-out from the back to form the switch cavitylG. Aswitch bracket I8 in the form of a.cup having its back wall spotweldedor otherwise suitably secured to the back wall otthe housing 2li hasthr'ee outstanding side flanges 19,- 80; and 8|, thev fourth side being closedby'Y the -adjacent side flange 22 of the housing 2B- The-switch base `'l5 lits removably in the'bracket .'l'withits open back side pre- .v-sented .to' the back-wall of the housing 2li, and

has along oneside a ridge or ledge B2 which is engaged bythe inturned outer edge of the flange 80. The opposite side oi the switch base l5 has a corresponding ridge or ledge 83, and a cotter pin 84 is passed through openings;85 in the flanges. 19 and 8l and engages therldge or ledge B3 rmly and removably ftor secure the switch base 'l5 in place on the backvwallof the housing ,20. One shank of vthecutter-upm 84 is spread or turnedinwardlyzatfitofprevent accidental displacement of thezpin.fff- 1:

.. .i Positlonedinfspaced relation'within switch @cavity l-sareiemaimfeenistf'lpins Si)4 secured vr to :separatezspaeed terminalA members Si, which terminal. members pass through and are secured in the'ix'ontwall of the insulating switch base 15..:-Eacligtermina1vmember has an integral in- Y waralypspaeed temmsirpomon sa also secured in the;irontwal1 92v of the switch base l5. The cbnductorsrls offthe circuit for-the valve I2. whichare insulatediat--BL enter? the housing 2li 4through(anfinsulating.grommet 95. One of the Aconductors I9 is connectedbya terminal screw at48 topi-event its turning in the opening 49 in the djacentendlwall 2i. 4 The bushing 46 is also externallygthreaded for 'threaded engagement at 50 with a nut'52'by means of which the bushing is clamped in plagceuin the end wall 2i of the I 9B to the'termlnal member 9| for one contact 90. and the other conductor i9 is connected by a corresponding terminal screw tothe correspond a ing terminal member 9iV for the other contact 20.

A switch insulator piece 91 is preferably interposed between the open back of the switch base 15 and the base oi the bracket 18.

The switch stern |00 has rectilinear sliding movement in the switch base 15 with the headed outer end of the stem operating in position for cooperation with the,inturned end |02 o! an arm |03 on the switchlever 42;?tliis arm H23 being on the side of the pivot 40 opposite the sidc o! the lever which is pivoted to the reset stem 55. Within the switch cavity 16 the reduced inner end of the stem passes, through a bridging contact plate |05. A coiled spring |06, surrounding the reduced inner end of the stem |00 and interposed between the contact plate and a shoulder |0`| on the switch base 15, yieldingly urges the plate |05 into bridging contact with the contacts 90 to complete the circuit |9. By engagement of the contact plate |05 with the shoulder |08 on the stem |00I the spring |06 also yieldingly urges the stem |00 to its outwardly projected position as shown in Figure 1.

The pivoted arm 42 as a ag or indicator member ||0 formed integral therewith. This indicator member ||0 has "on" and .off" markings thereon as shown, or is provided with colored or other appropriatelyl marked portions for indicating through the opening in the switch cover 23, the position of the switch, as will presently appear.

The pilot bumer` 5, which is located in juxtaposition to the main burner l0 to maintain a pilot light for lighting the main burner, is supplied with gaseous fuel by a pilot supply pipe I6. The pilot supplypipe ||6 may be connected with the main fueLsupply pipe anterior of the valve I2, or it may be supplied with fuel for delivery to Vthe pilot burner in any other desired manner.

A therrnocouple,` indicated at I3, is placed in position so that thehot junction ||9 thereof will vbe heated by the pilot flame as long as the pilot flame is burning. 'The construction of the thermoccuple may be similar to that more fully disclosed: in Oscar J. Leins Patent No. 2,126,564,

granted August 9, 1938, or a .thermopile or any other form of thermoelectric generator may be employed. i

.For the purpose of the-present descriptionpsuflice it to state that the particular `therrnocouple thermocouple member |20, for. instance through a sleeve |25, to iorm a third thermojunction |26. The inner lead conductor |22 is insulated from the outer lead conductor |24, or instance., by a wrapping of insulation on the inner lead conductor as indicated at |20.

A. quick detachablegcr. removable connection is preferably provided between the opposite-ends of the'leads 22 and |241and the-coil 41 of the electromagnet. This removable lead connectipnmay be of the form disclosed in my copending--application hereinbefore identiiied, and is illustrated in that form, although itmaybe of any other suitable or preferred form.. Sufdce it to state that the inner lead |22 has a connector cone |30 which seats in the correspondingly recessed outer end of the-terminal tip |32 and is clamped in contact therewithby a connector sleeve |34. The adjacent end of the outer tubular lead conductor |24 s connected in circuit with one-side of the coil 41 through the bushing 46, and-the other side of the coil is connected to the terminal tip |32, the parts being suitably insulated as shown.

To start the operation of the system shown in the drawings, the following sequence is followed:

The actuator or reset member 30 is pressed inwardly from the position shown in Figure 5 by engaging the button 32 with the hand or fingers and imparting pressure thereto. The spring 10 at this time, and when the actuator member 30 is in projected position as shown in Figure 5. tends to rock the lever 42 about its pivot 40, holding the inturned end |02 of the lever against the switch pin |00, and the spring 10, being stronger than the spring |06, holds the switch pin in its inwardly retracted position and the bridging contact |05 out of contact with the contacts 90. As the actuator or reset arm 30 is pressed inwardly, the spring 'I0 continues to hold the switch plate |05 in open position, and the inward movement oi the actuator arm 30 rocks the lever 42 about the cooperating end of the switch pin |00 as a fulcrum until the armature 55 is cocked or set into attracted position against the pole ends of the magnet frame 45.

The pilot burner ||5 is lighted, or, having been lighted, 'heats the thermoelectric generator, and the actuator member 30 is held pressed inwardly until the heat of the pilot name on the thermoelectric generator has energized the electromagnet suiclentLv4 so that it will hold the armature 55 attractednthereto.

When the electromagnet is energized sufficient ly. to hold the amature 55 in attracted position. the actuator member 30 is'released and the reset stem remains in cocked position holding the :pivot 56 in xed position so that the outward arm in a clockwise direction about the pivot 66 vand under the action'of the spring 38 to the position shownin Figure 1; The switch pin |00 is releasedupon 'separation of the cooperating portion |02 oi the arm 42 therefrom, and the spring |08- moves the contact plate |05 into bridging contact with, the contacts S0 to close the circuit i9. `'I'l-ie circuit is thus closed not by theinward-movement of the reset member 30. but-'by the-movement of this reset member 30 to its outwardly projected position following the resetting operation' and only whenY the electromagnet .is eiiective to hold the amature 55 in attracted position.`

II thezcpilotburner is not lighted t'o produce the thermoelectrlc current-for holding the armaturev 55 .in 'attracted position upon setting the same to 'that position by the .actuator member 30, the armature 55 and the stem' 55'wi1l move to retractedposition with the movement of the actuator member 30 Ato its outwardly projected position',AI the"`spring 10 'at such time maintaining the switcl'iiplatel in open position through the Pireienn-Hif.

l ILfaitr are set as shown in Figure 1 and thepilot burner is lighted to holdthe parts' in` the positions shown in this gurethe pilot burner is extinguished, the amature 55 is released. The spring 'I0 then operates to move the armature-to retracted position and, through the reset stem 55, swings the pivoted arm` 42 in a counterclockwise direction about its pivot 40 on the actuator .member 30, causing the inturned end |02 of the arm 42 to engage the switch pin |00, forcing the same inwardly and separating the switch plate |05 from the contacts 90 to open thefswitch. This opens or'interrupts the circuit I9 and the valve I2 operates to closed position to shut off the supply of4 fuel'to` the main burner.

When the armature is in retracted position and the switch is in open position as shown in Figure 5, the Oil marking on the indicator arm H is positioned to be viewed through the opening 2li to indicate that the switch is 0111" When the armature is in attracted position and the actufator member 30 is in its outwardly projected p0- sition, the "On" markingon the indicator arm illl is positioned to be viewed through the opening 26 to indicate that the switch is On."

The iront wall of the insulating switch base I5 may be provided with an integral insulating rib |60 forming an insulating barrier between the terminals 9i. It may also have integral insulating side ribs IBI forming insulating barriers at opposite sides thereof.

The embodiment of the invention shown in the drawings is for illustrative purposes only', and it is to be expressly understood that said drawings and the accompanying specification are not to be construed as a definition of the limits or scope of the invention, reference being had to the appended claims for that purpose.

I claim:

l. In a. switch of the class described, lx1-comblnation, a reset member, a lever having pivotal connection with said reset memberipafswitch'having a switch' stem cooperable withfsald 'lever and constituting a fulcrum about which 'said -lever is adapted to be rocked by resetting movement of said reset member, the 1cooperation 6I said lever with said switch pin'holding sald'switch pin in open circuit position duringthe 'resetting operation, a resetstem connected to said lever and adapted to be reset bythe 'rocking movement imparted to said lever about said switch pin as a fulcrum by resetting movement'fofsaiwreset member, and means for holding saldreset stem in reset position. f f I A 2. In a switch of the class described, in com,- bination, a. reset member, a lever havingV pivotal connection with Vsaid reset member, a switch' having a switch stem cooperable with said lever and constituting a fulcrum about which-'isaid lever is adapted to be rocked byresetting movement of said reset member, the cooperation uof said lever with said switch pin holding said switch pin in open circuit position during thefresettin'g operation.' a reset stem having pivotal connection with said lever and adapted t'o-be reset by the rocking movement imparted to"` said lever about said switch pin as affulcrum'iay resetting movement of' said reset member; means'vior holding said reset stem in reset positionfandfmeans operative upon release of said reset-member ifor actuatingsaid member to its: outwardlyfprolected Aposition andl operative when said resetl member is released with said reset stem held in resetposition to swing said lever aboutits pivotal ponection with lsaid reset stern in a' direction torelease said switch stem. A

3. In a switch o f the class-describei'in cornbination, a reset member, a lever having pivotal connection with said reset member, a switch havlng a'switch stem cooper-able with saidlever and constituting a fulcrum about'which said lever is adapted to be rocked by resetting movement of said re'set member, the cooperation o't said lever with said switch pin holding said switch pin in open circuit position during the resetting operation, a reset stem connected to said lever and adapted to be reset by the rocking movement imparted to said lever about saidswitch pines a.

fulcrurn by resetting movement ol said reset member, means for holding said reset stem in reset position, an enclosing housing having an opening in the wall thereof, and an indicator 5 arm on said lever and having indicator means visible through said opening to indicate the position of the switch.

4. In a switch of the class described, in combination, a reset member, a lever having pivotal l0 connection with said reset member, a switch having a switch stem cooperable with said lever and constituting a fulcrurn about which said lever is adapted to be rocked by resetting movement oi said reset member, the cooperation of said lever with said switch pin holding said switch pin in open circuit position during the resetting operation, a reset stem having pivotal connection with said lever and adapted to be reset by the rocking movement imparted to said lever about said switch pin as a fulcrum by resetting movement of said reset member, means for holding said reset stem in reset position, means operative upon release of said reset member for actuating said .member to its outwardly projected position and operative when said reset member is released with said reset stem held in reset position to swing said lever l'about its pivotal connection with said reset-stem in a direction'to release' said switch stem-tor movement to closed circuit position, an

enclosing housing having an opening in the wall thereof, and an `indicator arm having onand off indications thereon, with the oi indication visible'lthrbu'gh said opening when the r'eset stem and `reset member are released, the on indication .being visible through said opening when the reset stem is heldin reset` `position and the reset memberisreleased;"

5. In a switch of the class described, in comblnatio'rna support, a reset member slidable on 4o 'said support, a'lever having pivotal connection member, the' cooperation of said lever'with said switch'pinholding lsaidsvvitch pin in open circuit positlonlduringthe reset-ting operation, a reset stem Vhaving'pivotal connection with said lever-imd'adapted tobe rese't by the rocking move- 'ment imparten to said lever about said switch pinas'amlcimn by`rsettlng movement of said reset mmbe'r, andimeans for holding said reset steminresetpos'ltion.-

6. In`a switch o! theV class described, in com- 55 bination, a'reset nember'factuated between resetting and"projeted positions by rectilinear m'ovem'eizit,` alever having 'pivotal `connection with saidreset member intermediate its" ends, a switch `having contact means' f andf 'a pin spring- 6o "pressed to on positlomsaid switch pin cooperflungV with saidievr on drie 'sid-e ''f its pivotal "connection with said l'reset member and consti- 'tutingaifulcrum about whichsaid'lever is adapted'to'be rocked by' resetting movement of said re'set member, the cooperation 'oi' said lever with said switch-pin holding fsaid'switch pin in open circuit position during the resetting operation, a reset stem operatively -connectedLto said lever on the other side of lsaid pivotal; connection and condition responsive means for holding said re- (5 movement, alever having pivotal connection with said reset member intermediate`its ends. a switch having contact means and a switch pin spring pressed to "on position, said switch pin cooperating with said lever on one side of its pivotal connection with said reset member and constituting a fulcrum about which said lever is adapted to be rocked by resetting movement oi said reset member, the cooperation of said lever with said switch pin holding said switch pin in open circuit position during the resetting operation, Vi() a reset stem operatively connected to said lever on the other side oi said pivotal connection. condition responsive means for holding said reset stem in reset position, and spring means lor actuating said reset stem to retracted position and operative to swing said lever about its pivotal connection with said reset member in a direction to actuate said switch pin and r contact means to "oil" position.

8. In a switch'of the class described. in com- 2o with said reset member and constituting a ful- 3o crum about which said lever is adapted to be rocked by resetting movement oi said reset member, the cooperation of said lever with said switch pin holding said switch pin in open circuit posi,-

tion during the resetting operation, a reset stem having pivotal connection with said lever on the other side of its pivotal connection with said reset member, condition responsive means for holding said reset stem in resetfposition, and spring means stronger than said first spring means and 40 operative to actuate said reset stem to retracted position upon release of said holding means and to swing said lever about its pivotal connection with said reset member in a direction to actuate said switch pin and contact means to o posi- 45.

tion against the tension oi said rst spring means.

,9. In, a switch of the class described. in com bination. a support, a reset member having recresetting and projected positions, a lever having pivotal connection with said reset member inter# mediate its ends, a switch having contact means and aswitch pin, iirst spring means for actuating said contact means and said switch pin to` n" position, said switch pin cooperating with said lever on one side of its pivotal connection with said reset member and constituting a fulcrum about which saidlever is adapted to be rocked by resetting movement ot said reset memso ber, the cooperation of said lever with said`switch pin holding said switch pin in open circuit P0- sition during the resetting operation, a vreset stem having pivotal connection with said lever on the other side oi its pivotal connection with said re- 05 Set member, condition responsive means for holding said reset stem in reset position, spring means Y against the tension of said first spring means.

and spring means operative to actuate said reset member toits projected position.

10. In a switch o! the class described, in combination, a support, a reset member having rectilinear sliding movement on said support between resetting and projected positions, a lever having pivoted connection with said reset member intermediate its ends, a switch having contact means and a switch pin. iii'st spring means for actuating said contact means and said switch pin to on" position, said switch pin cooperating with said lever on one side of its pivotal connection with said reset member and constituting a ulcrum about which said lever is adapted to be rocked. by resetting movement oi said reset member. the cooperation of said lever with said switch pin holding said switch pin in open circuit position ouring the resetting operation, a reset stem having pivotal connection with said lever on the other side of its pivotal connection with said reset member, an electro-magnet adapted; when energized, to hold said reset member in reset position, a thermoeiectric generator responsive to the heat oi.' a name and connected in circuit with said electromagnet, spring means stronger than said nrst spring means anu opera.- tive to actuate said reset stem to retracted position and to swingsam lever about its pivoteo. connection with said reset member in a direction to actuate said switch pm and contact means to "oir" positionagainst the or said nrs spring means, an 'enclosing housing having an opening m tne wan thereof, and an mmcawr ann on said lever and having indicator means visible through said opening to indicate the position of the switch.

il. 1n a switch o! the class described, in combination, a support, a reset member mounted on said support, alever having pivotal connection WILD. Sld Ieefv m8111061', 8 SWILCII Comprising 8.11

bese, a contact plate on said pin. spring meansv for actuating said switch pin to proiected position and said contact plate intobringing contact .$131 saldmcontacgpins'said`switcn pin constil 1 u s a I crum out m tilinear sliding movement on said support between lillv w ch sam ever is adapt ed to berocxednyreseutmg movement or said reset member, the cooperation of said lever with said switch pin homing said switch pin in open circuit position dunng the resetting operation,

a reset stem pivotauy'connected to said lever and adapted to ne reset by the rocking movement imparted to said lever. by resetting movement of I said reset. member. condition responsive means for holdin! saidreset stem in reset position, and

second spring means for actuating said reset stem to retracted position and operative to swing said'lever about its pivotal connection with said reset member in a direction to actuate said switch pin and contact means to on" position against the tension of said iirst spring meana 12. In a switch of the'class described, in combination, switchmeans. spring means for actuating said switch to on" position, a reset member. a lever having pivotal connection with said reset member andV cooperable with said switch,

a reset stem pivotally connected to said lever and adapted4 to be Iactuated toreset position by resetting movement oi' said lever about said switch means as a iulcrum, condition responsive mc'ins for holding said reset stem in reset position. and

spring means operative upon release 0i' said condition responsive holding means for actuating said reset stem to retracted position and operative to actuate said switch to "oil'" position through said lever and its cooperation with the switch.

13. In a switch of the class described, in combination, a reset member, a lever having pivotal connection intermediate its ends with said reset member, switch means cooperable with said lever on one side of its pivotal connection with said reset member. and means having operative'com nection with said lever on the other side oi its pivotal connection with said reset member-and adapted to be actuated tococked position by swinging movement imparted to said lever about said switch means as a iulcrum by resetting movement of said reset member.

14. In combination, a reset member.4 a lever having pivotal connection with said reset member, a controlling member having an operating position and a safety position and cooperable with said lever to constitute a fulcrum about which said lever is adapted to be rocked by resetting movement oi said reset memberI the cooperation of said lever with said controlling member holding said controlling member in safety position during the resetting operation, a. reset stem connected to said lever and adapted to be reset by the rocking movement imparted to said lever about said controlling member as a fulcrum by resetting movement of said reset member, and means for holding said reset stem in reset position, the pivotal connection between the lever and said reset member constituting a fulcrum about which said lever is adapted to rock to actuate said controlling member to safety position upon release of said holding means.

CLARENCE WANTZ.

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