US2551373A

US2551373A - Electromagnetically actuated contactor with start and stop and hold-in switches

Info

Publication number: US2551373A
Application number: US51976A
Authority: US
Inventors: Herman J Hammerly
Original assignee: Trumbull Electric Manufacturing Co
Current assignee: Trumbull Electric Manufacturing Co
Priority date: 1947-08-02
Filing date: 1948-09-30
Publication date: 1951-05-01
Anticipated expiration: 1968-05-01

Description

May 1, 1951 H. J. HAMMERLY 2,551,373 ELECTROMAGNETICALLY ACTUATED CONTACTOR WITH START AND STOP AND HOLD-IN SWITCHES Original Filed Aug. 2, 1947 4 Sheets-Sheet l g Q J INVENTOR.

, J 2| (2O (2' +16. Hermon J.Hc1rr 1merly BY 1% n 7 n @5 574;-

(I60 Isa l5 16b ATTORNEY May 1, 1951 H. J. HAMMERLY 2,551,373

ELECTROMAGNETICALLY ACTUATED CONTACTOR WITH START AND STOP AND HOLD-IN SWITCHES Original Filed Aug. 2, 1947 4 Sheets-Sheet 2 7 o |27" es INVENTOR. Herman 'J. Hummerly ATTORNEY y 1, 1951 H. J. HAMMERLY 2,551,373

ELECTROMAGNETICALLY ACTUATED CONTACTOR WITH START AND STOP AND HOLD-IN SWITCHES Original Filed Aug. 2, 1947 4 Sheets-Sheet 3 IN VEN TOR.

Herman J. Hqrnmerly ATTORNEY May 1, 1951 2551,373

' H. J. HAMMERLY ELECTROMAGNETICALLY ACTUATED CONTACTOR WITH START AND STOP AND HOLD-IN SWITCHES Original Filed Aug. 2, 1947 4 Sheets-Sheet 4 16b INVENTOR.

LOAD LOAD Herman 'J. Hummerly ATTORNEY Patented May 1, 1951 ELECTROMAGNETICALLY ACTUATED CON- TACTOR WITH START AND HOLD-IN SWITCHES Herman J. Hammel'ly, Plainville, Conn., assignor to The Trumbull Electric Manufacturing Company, Plainville, Conn., a corporation of Connecticut STOP AND Original application August 2, 1947, Serial No.

765,697. Divided and this application September 30, 1948, Serial No. 51,976

Claims.

My invention relates to switches of the type of my application Ser. No. 463,215 filed October 24, 1942, now Patent No. 2,449,221, and this application is a divisional case from application Ser. No. 765,697 filed August 2, 1947, now Patent No. 2,500,635.

One object is to provide in a single device the functions of a contactor, a disconnect switch and a start and stop switch.

Another object is to provide a switch of this character which can be electromagnetically controlled and manually disabled.

Another object is to combine in a single unitan electromagnetic contactor, a hold-in switch, a thermostatic overload release, a start and stop device and a disabling switch.

In carrying out my invention in its complete form, I provide a support having line and load terminals, an electromagnetically actuated main switch with a start-and-stop control, overload relays, a hold-in switch and a manually operable switch for de-energizing the coil of the electromagnet and for disabling and disconnecting the main switch.

Details of the invention will be understood from the accompanying drawings and the following specification.

Fig. 1 is a front elevation of switch mechanism embodying one form of my invention, the

disabling switch being in the on position, parts being broken away.

Fig. 2 is a plan view of the same, parts being broken away.

Fig. 3 is a vertical sectional view on the plane of line 33 of Fig. 2, with the parts of the main Fig. 9 is a fragmentary sectional view taken on the plane of the line 9--9 of Fig. 1.

Fig. 10 is an exploded perspective view showing parts of the various switch contacts.

Fig. 11 is a diagram of the circuits.

Fig. 12 is a diagram of a fragment of a modi fled circuit.

A support 15 has a conventional resettable overload relay IS with a button or knob IS on each side and an electromagnet coil l1 between them. The armature core 18 is movable up and down within the coil and carries a cross piece I9 beneath the lower bar of a yoke 20 which slides between guides 2|, 2|. A plate 22 forms the upper part of yoke 20 and the side arms of the yoke are slidable through the bottom plate 23 of the main support.

An insulating body is mounted on plate 23 and comprises two

parts

24 and 25 which are secured in place by screws 26. In the passageway between those parts, an insulating block 21 is slidable horizontally by means of a handle 28 on the crank shaft 29. This shaft has its ends supported in

parts

24 and 25 and has an offset portion 29' which engages in a recess 21' in the block 21. A throwing spring and bar 30 holds the crank shaft and the block 21 in the off or on position at the right or left as the case may be.

An insulating carrier 3| is slidable vertically in a guideway in the block 21 and has

lugs

32, 32 projecting from its lower edge to interlock or engage in slots 33 in the side arms of the yoke 20 when in one position. A tubular cross bar .34 is mounted on a screw 35 which passes through the front part 25 and is screwed into Fig. 5 is a fragmentary sectional view on the A a bracket 36 on the rear part 24. The carrier 3| has a cam-like portion 31 at the left (Figs. 2, 3 and 10) adapted to engage the cross bar 34 of the carrier when the block 21 and the carrier 31 are moved manually to the right to disable the switch. Such action forces the carrier downwardly regardless of'the action of the coil [1.

At the back of the body are the terminals 46, 4! and 42 and at the front are the

main line terminals

43, 44 and 45. Each of these terminals has a contact member 46 which projects into an undercut recess 41 in one of the insulating parts of the body such as 25 (see Fig. 8). The block '21 has a corresponding number of outwardly extending contacts 48, 4B. These contacts 48 are so located that they are all exposed to view when the block is at the right and are 3 concealed when the block is at the left as viewed in Fig. 2.

Contacts

46 and 48 are the contacts of the disabling switch. Terminals 4'5, 44., 45 and the mainline terminals and terminals [6a, "5b and M are the load terminals.

At the inner end of each contact 48 is a contact 50 of the main switch.. Thecarrier" 31 has a number of switch members 5!, 51' the: ends of which engage the

respective contacts

50, 50 and .each is mounted in a recess 52 in the carrier. and

pressed upwardly by a spring'bts'o that when. the carrier is raised the main circuit switches will be closed provided the block 2'!" is at the left hand or on position.

A safety switch in the coil circuithas two ter"

minals

55 and 56 with contacts 51'', 51""whi'chs are concealed in an L-shaped recess 58 in the part 25 (see Figure 2). The block 27 has a contact 59 which connects the contacts 51, 5'! when the disabling switch: block is in the: closed circuit position. When the blockis moved toward the right as viewed in Fig. 1,. this. safety switch immedi'ately open the coil circuit and. deenergizcs the magnet A start-and-stop switch (Figs. 1, 2, l,- 5, 8 and 10) has a contact bar 66' with an offset member 60 loosely mounted. on a stud 6|. in a hollow insuiating housing 21". Bar 69 is connected to terminal 44" by a strap 62 and pressed outwardly by spring 631 The ofi'set 6'5 and the opposite end of b'ar'tecoact with contact members 613 and 65 respectively supported by body part 25. The spring 63 normally presses the right hand end of said bar' 60 away from contact member 65 and presses the left hand end 68' against contact member 6 This bar 60' is manually actuated by pressing the start button 66 or the stop button bias the case may require. Button 56 has a limited motion in' the block 271" so that it can not p'ush the bar Bil" far enough to cause the left" end of 60 to engage contact 64. This left endof lieof course may be insulated" in any suitable manner from: contact 64.

The hold-in switch (see Figs. 4', 5-, 8 and 10)" includes a switch member 10" which is resiliently mounted on one end ofan insulating bar ii. The other end of bar 11' is carried by the cross piece 22' of the armature yoke or frame 20 so that switch member it moves up and down with the armature core: 8 f the magnet. When the coil [IT isenergized the switch member 76* contacts and electrically connects the extensions 13 and 14' of the stop and-

start contacts

64 and 65 re'- spectively.

If we assume that the overload relays are set foroperation and that the: manually operable slide 21 with its

satety switch contacts

51, 55*, are: in the on position at the left in. Figs. 1 and 2, the loadcircuits may be completed by pressing on the start button 66'. This connects switch member 60 to contact 65 andcompletes a circuit from line terminal 44 through the thermal cut-ou-t of the right hand relay, I6, through the coil I l of the electromagnet, through the thermal cut-out of the left hand relay IE to the terminal 56, through the safety switch contact 5'1. 59, 51 and terminal 55 to the line terminal 43. The magnet is thus energized and raises it armature which lifts the main switch contact carrier 3i and closes the main switch and the hold-in switch. The starting switch butten 66 is then released. The switch bar 60 when released tilts against contact 64 and thus closes acircuit through contact 13;, and switch member so that the coil circuit remains closed until opened by an overload, an underload or manual operation.

It will be notedthatthe switch. bar 69 normally engages contact 64 and remains in contact even while the start button 66 is pressed in. As a matter of fact the piece 60 with 60' actually pivots about the contact 64 when the start button 66' is actuated. The result is that when button Wis compressedii'ti completes the circuit between member 60 and the. contact 65 and thus closes the circuit through 73 and 14 and those circuits remain. closed even after piece 60 leaves the contact 65, and until piece 60' leaves contact 64.

In the case of an overload, the circuit is opened by oneoft'he conventional relays Hi which may be reset by a: push. button I6".

In" case of an underload, the magnet is deenergized' and its armature with the carrier 3! and the main switch contacts 5!, 5! drops from contacts 48., 4S and breaksthe. main circuits. To open the circuit inthe usual manner without disabling itthestop switchbutton- 51' is pressed in.-v This opens the circuit through the ho1d-in switch and thus breaks the coil circuit.

If it is desired to disable the switch so that it can not be started automatically, or if it is desired to obtain access to the main switch contacts, the block 27 carrying the main contacts ismoved to the right as viewed in Fig. 1 by turning the handle 28". This. breaks the coil circuit through the safety switch member 59 and. opens the main load lines and in fact bar 3 5. forces the; carrier with the main contacts downward toensure' separation of the main switch contact.

Figure 12' is a diagram showing a simplified. arrangement of the start and stop and hold-in switch members. In this figure the start contact 6 3- has' a resilient spring portion 64' with which member 68" normally contacts. MOVing the member 60 into engagement with contact 65 completes the circuit through the coil I7 and thus closes the circuit through contacts I3 and M as the other arrangement. To open the circuit, member 60 is moved away from the resilient contact 64 which breaks the coil circuit and deenergizes the switch. In such an arrangement if the start button (not shown-)- should become stuck or welded the circuit can be opened b the stop button".

1. The combination of an insulating body having terminals with switch contacts connected to the respective terminals, an insulating block manually movable with respect to said body and having outer switch contacts adapted to coact with the: respective contacts on the body, said block having other inner contacts constituting the main. contacts and respectively connected. to the outer contacts of the block, a carrier movable in said block; switch members carried. by said carrier for coacting with the respective main innor contacts of said block, a magnet coiland armature for actuating said carrier to close circuits through: the main contacts when. said coil isenerg'ized, a hold-in switch having a member carried by said carrier and a start-and-stop switch having contacts connected to the hold-inswitch.

2-.. The combination of an insulating body, an electromagnet having a movable armature member, a common support for said. body and said electromagnet, a start-and-stop switch having stationary contacts and a movable contact mem-- ber supported by said body and a hold-in switch having stationary contacts carried by said body and a movable contact member, conducting straps connecting the respective stationary contacts or" the start-and-stop switch and the holdin switch, means for manually actuating the contact member of the start and stop switch in a direction at right angles to the movement of said armature, and means of connection between the armature and the contact member of the hold-in switch to close a circuit through said coil when the magnet is energized.

3. The combination of an insulating body, an electromagnet having a movable armature member, a common support for said body and said electromagnet, a start-and-stop switch having stationary contacts and a manually operable movable contact member supported by said body and a hold-in switch havin stationary contacts carried by said body and a movable contact member, conducting straps connecting the respective stationary contacts of the start-and-stop switch and the hold-in switch, means for manually actuating the contact member of the start-and-stop switch in a direction at right angles to the movement or" said armature, means of connection between the armature and the contact member of the hold-in switch to close a circuit through said coil when the magnet is energized and a main switch having a movable member actuated by said armature.

4. In a magnetic contactor, a back plate, an insulating body secured to the upper part of the back plate, an electromagnet carried by the lower part of the back plate and having a coil with a vertically movable armature, a yoke carried by said armature, a start-and-stop switch carried by the body at the front thereof and havlIlg contacts in front of said yoke and a tilting switch member for opening and closing a circuit through said magnetic coil, a hold-in switch having a-movable contact member carried by said yoke and stationary contacts, and conductors connecting respectively the contacts of the start-and-stop switch with the contacts of the hold-in switch.

5. A contactor comprising a back plate, an insulating body secured to the upper part of the back plate, a main switch carried by said body and having stationary and movable contact members, an electromagnet carried by the lower part of the back plate and having a coil with a movable armature, a yoke carried by said armature, a slide carried by said yoke, said movable contact member being carried by said slide to close a circuit through said main switch when the magnet is energized, a start-and-stop switch carried by the body at the front thereof and having contacts in front of said yoke and a movable contact with movable push buttons for actuating the same and a hold-in switch having a movable contact member carried by said yoke and stationary contacts connected respectively to the contacts of the start-and-stop switch.

HERMAN J. HAMMERLY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,477,834 Leddick Dec. 18, 1923 1,845,227 Bower Feb. 16, 1932 1,919,979 Gofi July 25, 1933 2,339,750 Bartholy Jan. 25, 1944