US1033900A - Motor-controlling device. - Google Patents

Description

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J. T. JANBTTB.

v 1QT0R CONTROLLING 'DEYICL Y APPLICATION. IILED NOV. 7, 1910. I V 1,033,900, Patented July 30,1912.

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MOTOR CONTROLLING DEVICE@ APPLICATION FILED N0v.7,1910.

l) A. I

. Patented July-3o, 1912. I

Afiiiuiiiii .STATES onirica.

To all whom it may concern.' 'I

Be it known that I, JOHN T. JANETTE,

l a citizen of the'United States, residing at Chicago, county of' Cook, and State of Illinois, have invented new and useful' Improvements -in Motor-,(`)ontro1lii1gl Devices,

of `which. the following is a specification.

My invention relates'to improvements in controlling devices for motors, ywith especial reference'to that class of devices which are employed for' automatically' starting and --stopping an electric motor connected with air pumping mechanism, whereby a desired air pressure in the delivery or service pipe connections may be uniformly maintained. The object of my invention is to provide a' form of controlling apparatus which will be actuated in part by the air itselfwhen the predetermined pressure is attained, and in part by an independent positive movement or free throw, adapted to separate the electrical connections with a quick positive stroke independently of the slower inc vements caused by the gradually increasing pressure of the air.

In the following description, reference is had -to the accompanying drawings, in which- Figure l is aside view, part Yin'section, of

an air pumping mechanism embodyingmy invention, thepart in section being drawn to a plane exposing one side of the cpntrolling apparatus. Fig. 2 is a plan view of thev same-with the air pumps illustrated in horizontalI or cross section, and the motor,l`

together with the connections for driving the pump' pistons, removed.

Like parts are identified by the same vreference. characters in both, views.

The motor .Ar and pump cylinder. preferably ing cylinders are employed, and the pis- -tons b therein are driven from the motor' through a shaft a and suitable gearinglojcated in the casing a (a worm and wormv a valve VD beingpreferably employed in I3 are mounted upon the same base C.- In the construction illustrated, two` pump- MOTORLCONTROLLING -DEVIGE Specification of Letters l:Patent I Patented uly 30, 1912. ApplicationnledNovember`7, 191,0. l Seria1`No;5-90,9'68. l

the pipe connectionsd to prevent a return g of air to the pump cylinders'. A diaphragm f chamber E, rovided with a partition diaphragm e, is' connected below -the diaphragmv withV the air supplyv connections.

In the construction-illustrated, the pipe e n serves as a means ofcommunicationbetween the pipe' d beyondgthe valve Df and the chamber The diaphragme is-fleXible, and it is therefore obvinisvv that aS,-t he pressure increases inthe-pipedfand :inthe I diaphragm chamber below thediaphragm c, said diaphragm vvvwill be lifted ,with increasing upward pressure proportioned to the pressure of the air. 'r

The upward movement operation of a switch bar F, `whichA inf'jturn controls the circuit of the electric motor A,

said switch bar F beingv provided with downwardly extending contact arms f at each end, adapted to pass between resilient terminals, comprising upwardly projecting lips f mounted upon'the base C and electrically connected with the current con;

ductors G which supply current to the mof tor A from any suitable source of electrical energy. Y l v The switch bar F is provided with a rearwardly extending-arm H, which is rigidly connected with 'a lever I pivotally supportedl from the base vor bed at I. When the diaphragm e is raised by the pressure of the motor delivered air as above explained, the upward movement of said diaphragm e is transmitted througha post J, mounted upon the diaphragm, to a lever K, to one arm of which said post i's pivoted at'lc. The leverv lis pivoted atclv to a fulcrumlinkipost L supported freni any suitableA part vof the of the diaphragm c, above described, .is used tol control-the frame or base, preferably from thecasing X vof the diaphragm chamber E. This lever I( is provided with a depending-foot piece 5M, adapted to engage one arm of the lever .I in the rear ofthe connection between said lever I and the arm H, in` the vconstruction 'as illustrated in tlie'.'drawings. Said lever K vis also provided'with a'swingi'ng switch actuating member-,Nif Said member Nfis pivoted Vtothe lever K and is provi-ded with an anti-friction. rollerN, adapted to bear;- f" normally upon an angular face'fri at theeXtremity of the lever. I which is nearest the switch bar A spring O connects the lever N with the lever K in such a manner as to hold the roller N forcibly against said angular face n of the lever I. When the diaphragme is lifted by the air pressure in the lower part of the diaphragm chamber, the actuating member N moves downwardly until the roller passes the extremity z' of the lever I and engages upon the angular under surface n of said lever, whereupon the pressure of the roller N of the actuating member N, will be exerted upon the 'angular face n and will tendto lift this arm of the lever I, thereby also vlifting the switch bar F out of contact with the terminals f. This lifting pressure is produced by the reaction of the spring O and` therefore, as soon as the switch bar F commences to move, the pull exerted by said spring O will cause it to lift with a quick positive stroke in a manner to prevent dev structive areing between the contacts f and terminals f. y

It is desirable. that the engagement of the contact arms f'with the terminals f shall be a forcible engagement, and the ter- -minal lips f are'therefore formed of resilient material capable of 'exerting' considerable frictional pressure upon thecontact arms f. ForI this reason the springO. cannotbe made of sufficient strength to insure the lifting of the switch bar F under all conditions withouthaving said spring O .of such strength as to .require considerable power to force the roller N past the lever extremity z'.y .For this reason the4 foot piece M is provided, and a spring O of comparatively light -weight is used." The parts are so proportioned, that as soon as the roller N passes below the lever extremity z', the foot piecev Ml will come in contact' with the other arm of the lever IA beyond the pivot I and thus. exert a direct downward pressure upon this arm of the lever I, whereby theinitial upward movement ofthe switch bar F may be easily produced.' `This movement will continue until the Contact arms f of the switch bar F are suiiiciently released4 to permit them to be thrown upwardly by a quick positive stroke caused by the reaction'of spring O.-

lA spring S 'is coiled-around the'i'post J" and' interposed between the diaphragm -E- eted member T, having threadedand a Vsoc connection with the diaphragm casing in an aperture through which Said post J Iextends. When the pressure in the dia' phragm chamber E below the diaphragm e falls below the desiredor predetermined limit, the reaction of spring S forces t-he diaphragm e downwardly and draws the short end of lever K downwardly, whereupon the member N moves upwardly until the roller N passes above the extremity z' of the lever I and' bears' upon the angular face a of saidv lever I. 4In this position the pressure of' the roller N causes the leve'rI to swing back tothe normal position? invention as employed in connection with an electric motor, Ido not intend to limit the,scope of my claims to the use of any specic type of motor, nor to the use of any specific motor controlling member, such vas the switch bar F.; Neither do I intend by the specific descriptionV of the mechanism illustrated, including the connections for actuating the switch bar- F or controlling so as to exclude any mechanical' equivalents for the parts shown and described, the

member, to limit the scope of my invention" terms and expressions herein used and employed'in the appended `elaimsbeing used) as terms of description and not of limitation.-

Having thus described my invention, whatA I claim as new, and desire to secure by Letters Patent is;-

1. A fluid pressure switch mechanism,`

comprising the combination of a switch supporting lever having a projection angularly' faced' in two directions from an4 apexed extremity, an actuating lever controlled as to operation by Huid under pressure, a resilient yielding operating Vmember carried by the actuating lever in a position to move along the angular faces of said apexed extremity and tov beyforced across said extremityby the actuating lever, and a projection on the actuating lever adapted to engage and actuate-the Switch supporting lever in one direction at a predetermined stage of actuating lever movement, independently of said operating member. y

2. A fluid pressure switch mechanism, comprising the combination of a switch supporting lever provided with a fulcrum intermediate of ends and having an an- -gularly faced apexed projection -on one side of said fulcrum, an' actuating lever provided with ya foot piece adapted to engage the switch supportlng lever on the other sideA of'said fulcrum, an. operatin" member lpivoted tov the' actuating lever an adapted to move along the 'angular faces of said apexed projection to points above and below f. the apex, and -means for resilientlypressing said operating member against said longitudinal axis of the switch supporting lever. l

3. A switchl ',eclianism, comprising the combination of avswitch supporting lever provided with a tapered extremity, an actuating 'lever having a projection adapted to engage ,and positively actuate the switch supporting leverV in one direction, a switch ioo ,angular faces Aand inthe 'direction of the operating member yieldingly connected verl mayv be actuated in two directions by with the actuating lever and adaptedl to the pressure of said operating member. 10 move across said tapered extremity to posi- In testimony whereof I aizr my signations above and below the same, said opefr? ture inthe presence of two-witnesses.

5 ating'member being Aadapted t0 bear yield- -JOHN T. JANETTE.

ingly against the switch supporting lever Witnesses both whenA above and when below said eX- EUGENEA. MoNAs'r,

tremity, whereby said switch supporting lel .GEonGE H. STILLlvrAN.

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