US1316305A

US1316305A - hoeschen

Info

Publication number: US1316305A
Authority: US
Publication date: 1919-09-16
Anticipated expiration: 1936-09-16

Description

H. A. HOESCHEN.

AUTOMATIC ELECTRIC SWITCH.

APPLICATION FILED N.0V.22,1918'.

1 ,3 1 6,305 Patented Sept. 16, 1919.

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i i, HENRY A HOESCHEN. Q/vi tvwoo;

H. A. HOESCHEN.

AUTOMATIC ELECTRIC SWITCH.

APPLICATION FILED NOV. 22,1918.

1 316,305, PatentedSept. 16, 1919.

2 SHEETSSHEET Z.

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HENRY A. Hozscuzu.

attouwiw UNITED sirrrrns- A E T OFFICE.

HENRY A. nonscnmr, or organs, unnnnsxmnssmnon or own-mu 'ro BAKER ICE MACHINE 001mm,;or omens, NEBRASKA, A CORPORATION or NEBRASKA. I

ev'romnrrc ntncrmo' swrron.

Specification of Letters Patent. Patentd Sept, 16, 1919.

I Applicationfiled liove nber 22, 1918. Serial No. 263,930.

I To all whom/ct may concern} l Be it knownthatL'HENRrA. HoEsonnN,

a citizen of the United States, and a resident of Omaha, in the county of Douglas and State, of Nebraska, have invented certain 'MY invention relates to' el y actu' 10- matically, to sto and start the motor or to 4 stop and start t e operation of other electrically-operated devices in accordance with conditions which are Vfil'ld' b the operation of the motor or the like. l huawhere an electric motor is employed to operate a com pressor for a refrigerant, it. may, be desirable to stop and start the-motor automatically according to decreases and increases of temperature 1n a refrigerating chamber which is cooled by the compressed refrigerant. The main switch providedby my invention is actuated by elect'romagnets or solenoids'which are energized alternately by electrical energy supplied thereto by control-circuits, the latter being controlled by a thermostat or the like, and the control-circuits being opened at theends of movements of the main switch, after being closed for a sufiicient time to efi'ect the actuation of the main switch. It is the object of my invention to provide actuating means for the main switch whereby the same is locked inboth open and closed against movement by any force other than that of the actuating means itself; to provide means for opening the control-circuit only after the main switch has been fully moved in either direction, whereby the full force oi the'solenoids or electroinagnets is available for actuating the main switch; and in general to provide an inexpensive, durable, efiicient and convenient mechanism of this character.

In the accompanying drawings, Figure 1 is a front view of a switch mechanism'embodying my invention, Fig. 2 is a diagram- Bil maticview illustrating-the electrical circuits of a possible application of the switch mechanism, 3 is a front view of the switch mechanism in closed position, one of the actuating solenoids being in axial section, Fig. is a detail section on the line ii of Fig.

1ron, having foot-portions. 1 v uporr and. are secured to the base-plate 8.

material such as' brass said sleeve 3, Fig. 5 is. a detail sectionon the line 5--'5 of Fig, 3, Fig. 6 is a detail side view of the main switch-lever, a portion of the base being in section, and Fig.' 7 is a detail view of one of the contact-posts.

In carrying out my invention according t the illustrated embodiment-thereof, I provlde a base-plate 8 of insulating material, on which there is mounted a pair of soleside noids A and B, extending horizontally and y in axial alinement with each other. Each so'lenoidhas a pair of end-

plates

9 and 10, preferably of magnetic materi 1 such as soft which rest Said end-plates are connected to each other by a sleeve 12,;preferably of non-ma ttin over a tubular 13 on the plate 9, an

passing through a central aperture in the plate 10. The end-plates and sleeve thus form-a spool, which is suitably insulated and has a coil 14: wound thereon, the terminals of the. coil being connected with binding-V:

etioposts 15 on the base 8. 'Tubular cores 16 fit slidably within the sleeves 12 of the solenoids, and said cores are loosely connected to each other'by means of rods 17 formed internally with and extendin oppositely from the-ends of a plate 19. %he portions of said rods adjoining the plate are of smaller diameter than the bore of the cores 16,

but the ends of the rods have heads nearly, aslarge as the bore, and said heads areconnected with-the cores by transverse pins 18 of which the ends fit in short slots in the sides of the cores. By the described connections a slight movement of either core may occur without moving the other core or the plate 19, and binding of the cores in the sleeves is avoided, even should the sleeves not 'bein perfect alinement with eaclr other. The plate 19 has a cam-slot formed 33 extending parallel with the 'axis of the solenoids, but oppositely displaced laterally from saidaxis, and an intermediate ogeecurved portion 3% connecting said-end-portions 33. One edge of the cam-plate l9 bear against a roller 36 which is mounted revolu'bly upona post 37 secured on the baseplate 8 by a screw 38 extending through from the back of the base-plate as shown in Fig. 5

therein, said slot comprising end-portions by the arm 22.

The main switch-lever has three arms, 20, 21 and 22, and is mounted pivotally upon a stud 23 secured on the base-plate. Blocks 24 of insulating material are secured to the

arms

21 and 22 by means of screws 25, and said blocks carry laminated brushes each comprising a series of curved resilient metal -plates 26, having the end-portions thereof longitudinally kerfed or slitted, as shown in Fig. 6, to thereby form a plurality of resilient contact fingers. A pair of

contactposts

27 and 28 are arranged to be engaged by the brush carried by the arm 21', and a ment of those following. Opening movement of the switch-lever is limited by an adjusta'ble stop formed by a screw 29 carried on a post 30 arranged on the base-plate 8, as shown.

The arm 20 of the switch-lever extends alongside the cam-plate 19, contacting slidably therewith, and having an extended footportion .35 which engages the plate so as to prevent any tendency thereof to tilt or rotate about the axis of the rods 17. A roller 32 is mounted revolubly on a pin or stud 31 carried by said lever-arm 20, and said roller works within the cam-slot 1n the plate 19. By alternate energization' of the solenoids A and B, the cores 16 and cam-plate 19 are moved to actuate the switch-lever between the open and closed positions, shown respectlvely in Figs. 1 and 3, the movement of the lever being made while the roller 32 is traversing the ogee-curved intermediate portion 34 of the cam-slot, and the lever being held stationary during such time as the roller is in the end-portions 33 of the cam-slot.

At one edge of the cam-plate there is a projecting insulated pin 48 which is employed to operate circuit-breaking devices for opening the solenoid-circuits at the conclusion of the movements of the cam-plate. On the base-plate 8 near the solenoids there are mounted a pair of

posts

39 and 46 of which the end-portions are slotted to receive resilient contact-

fingers

41 and 45, respectively, said fingers being retained in the slots by screws.40. The adjacent ends of the contact-

fingers

41 and 45 are slitted as indicated in Fig. 4, and the ends of the fingers tend to engage a contact-plate 42 carried by a post 43 which is secured to the base at a position intermediate the

posts

39 and 46. Each of the contact-fingers have a bowed portion 47 presenting inclined surfaces for engagement-with the pin 48 carried by the cam-plate. The arrangement is such that, at each end of themovement of the cam-plate, and after the roller 32 has passed from the curved intermediate portion of the cam-slot into the axially extending end-portions 3.3 of said slot, the pin 48 will engage one of the portions 47 and press the respective contact-finger out of engagement with the plate 42.

Electrical connections between the Various parts are formed by conductors arranged on the back of the base-plateS, and indicated by dotted lines in Fig. 1, as follows: From the terminals of the solenoid A at the binding-posts 15, connections are formed to the post 39 carrying the contact-finger 41, and to a binding-post 49 disposed near the edge of the base-plate. From the terminals of the coil B similar connections are formed with the contact-finger 45 and a bindingpost 51. The post 43 which carries the plate 42 is connected with a binding-post 50, and the main-switch contact-

posts

27, 28,27 and 28 are connected respectively with

bindingposts

52, 53, 54 and 55 mounted on the baseplate as shown.

Referring to the circuit-diagram in Fig. 2, there are represented, in addition to the parts of the switch mechanism proper, an electrical generator G, a motor M, and a thermostatic switch or circuit-closer T, the latter comprising a central member or contact-arm 56 movable between stationary contacts 57 and 58. It may be assumed, as before mentioned, that the motor actuates a compressor for supplying a refrigerant to cool a room or chamber in which the thermostat T is located, and that it is desired to start the motor automatically when the temperature in the chamber reaches a determined maximum,- and to stop the motor automatically when the temperature has been reduced to a determined minimum. The main circuit from the enerator to the motor is indicated in t e diagram by heavy lines, and passes through the main-

switch contacts

27, 28, 27 and 28. The controlcircuits in the arrangement shown are supplied with energy from the same generator, one of the supply wires being connected with the center contact 42 of the circuit-breaking device or control-switch, and the other supply wire being connected with the central member 56 of the thermostat. One terminal of the solenoid A, as from the binding-post 49, is connected with the thermostat-contact 57, and one terminal of the solenoid B, as from the binding-post 51, is connected with the thermostat contact 58, the other terminals of the solenoids being connected respectively with the contact-

fingers

41 and 45 of the control-switch. as before noted. The parts being in the positions indicated in full lines, which correspond with the positions of the switch mechanism shown in Fig. 1, the motor-circuit is open and both control-circuits are open, but the circuit through the solenoid B is closable by movement of the thermostat-member 56 to engage the contact 58. Upon closing of said control-circuit and energization of said solenoid, the switch-mechanism is moved to the positions indicated by dotted lines in Fig. 2 and shown fully in Fig. 3, at whichthe main-switch is closed and the controlcircuit through the solenoid'B is broken by the disengagement of the contact-finger 45 from the plate 42. At the same time the contact-finger 41 is engaged with the plate 42, so that the control-circuit through the solenoid A is closable by movement of the thermostatmember 56 to engage the contact 57 It will be obvious that by the described actuating means for the main switch-lever, said leveris locked in either the closed or open position when the roller 32 lies in the end-portions 33 of the cam-slot, and no movement of the switch-lever can occur unless the cam-plate is moved by the solenoids. It will be noted also that the form of the intermediate portion 34 of the cam-slot is such that the movement of the lever is most rapid at an intermediate portion of its travel, andthat the rate of movement 1s reduced at the ends oftits travel, thereby making the work of the solenoids eas er, particularly at the end of the switch-closlng movement, where it is necessary to cause bending of the laminated brushes 26. When the switch is closed the reaction of the brushes against the lever causes a downward pressure of the roller 32 upon the cam-plate, but most of the lateral pressure is recelved from the cam-plate upon the guide-roller 36, so that movement of the cam-plate 1s not materially retarded by lateral pressure upon the solenoid cores,

Now, having described my invention, what I claim and desire to secure by Letters Patent is:

1. In an automatic electric switch, a pivoted main switch-lever, actuating means movable reotilinearly adjacent to said switch-lever, a plate carried by said actuating means and having therein a cam-slot comprising laterally offset end-portions extending parallel to the line of travel of the actuating means and an intermediate portion extending angul-arly to said line of travel, and a member carried by the switch-lever and entering said cam-slot, said parts so arranged that the switch-lever is moved about its pivot by movement of the plate while said member is in the intermediate portion of the camslot, and movement of the switch-lever prevented by said member when the same lies in the end-portions of the cam-slot.

2. In an automatic electric switch, a pivoted main switch-lever, a pair of solenoids axially alined and having movable cores, a

. ted

cam-plate disposed intermediate said cores. and connected loosely therewith, said camplate having a slot with an intermediate portion extending across the axis of the cores I and end-portions extending parallel to said axis, a portion of the main switch-lever lying in saidslot so as to traverse the intermediate portion of the slot and be actuated about the pivot of the lever by rectilinear movement of the plate, a control-switch having members connected in circuits through the solenoids/and means carried by the camplate and arranged to actuate the controlswitch at the conclusion of movements of the main switch-lever.

3. In an automatic electric switch, apair of solenoids having movable cores, 9. switchactuating member connected with said cores and movable thereby rectilinearly in alternating directions, ,a pivoted switch-lever having a part engaged by said actuating member and movable thereby during an intermediate portion of the travel of said member, control-switches connected in circuits through the solenoids, and means on the actuating member for opening the ,con-

-trol-switch for each solenoid at the conclusion of the movement of the member efi'ected by energization of the, respective solenoid.

4:. In an automatic electric switch, a pair of axially alined solenoids, cores slidable therein, a switch-actuating member loosely connected with and carried by said core member also arranged to lock the main switch-lever in circuit-closing and circuito-pening position at the conclusion of the respective movements. v

5. Mechanismas specified in claim 4:, in which the switch-actuating member comprises a cam-slotted plate, and the main switch-lever is pivotally mounted and has an arm extending adjacent to said cam-slotplate and movable transversely of the path of travel of said plate.

6. Mechanism as specified in claim 4, in which the switch-actuating member comprises a cam-slotted plate, resilient brushes carried bythe main switch-lever, fixed contacts engageable by said brushes at the circuit-closing position, and a guide-roller arranged to receive the lateral pressure from the cam-slotted plate resulting from reactive pressure of the resilient brushes upon the extending alongside the cam-plate and movswitch-lever when the same is inv circuitable transversely of the path of travel of closing position. said plate-said arm contacting slidably with 10 7. Mechanism as specified in claim 4, in I one side of the plate and adapted to prevent 5 which the switch-actuating member c'omtilting thereof.

prises a, cam-plate, the main switch-levei pivotally mounted and having an arm HENRY A. HOESCI-IEN.