US2823281A - High speed relay - Google Patents

High speed relay Download PDF

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US2823281A
US2823281A US612495A US61249556A US2823281A US 2823281 A US2823281 A US 2823281A US 612495 A US612495 A US 612495A US 61249556 A US61249556 A US 61249556A US 2823281 A US2823281 A US 2823281A
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reed
relay
contact
magnetic
resilient
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US612495A
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Anthony E Sprando
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Iron Fireman Manufacturing Co
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Iron Fireman Manufacturing Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/29—Relays having armature, contacts, and operating coil within a sealed casing

Definitions

  • This invention reiates generally to electric relay mechanisms and more particularly to sensitive millisecond relays required to withstand mechanical or thermal shock or a wide range of mechanical vibration without loss of ycalibration or operating reliability.
  • Fig. l is a side elevation View in partial section of a relay with a single pole switch, the relay being made in accordance with the teaching of this invention and being encapsulated in a standard form of hermetically sealed container having the electric terminals for the relay insulatedly sealed through the end of the container in a well known standard pattern.
  • Fig. 2 is a view similar to Fig. l but with an additional relay encapsulated within the same container.
  • Fig. 3 is a View in plan section along the line 3-3 of Fig. l.
  • Fig. 4 is a fragmentary View in side elevation and partial section as viewed from the line 44 in Fig. 2.
  • Fig. 5 is a View in plan section along the line 5 5 of Fig. 4.
  • a container base rabbeted at 12 to be received in the open end of container cup 13 to which base 11 is soldered in iinal assembly.
  • FIG. 4 and 5 there are ten spaced electric terminals, 1d to 23, hermetically and insulatedly sealed with glass 24 into appropriate holes 25 in base 11.
  • Metal axle 26 ⁇ fixed axially to base 11 is formed with a longitudinal rib, not shown, to require proper registration, in use, of terminals 14, 23 in a plug receptacle, not shown, common in the art.
  • Fixed upwardly axially on base 11 is a stud 27 having its upper end threaded, as shown.
  • Toroidal ceramic insulator 2-8 cored centrally to receive stud 27 has an upwardly extending neck, not shown, received by a mating centrally bored hole, not shown, in electromagnet base part 29.
  • Insulating washer 30 resting on base part 29 together with lock washer 31, nut 32 and ceramic insulator 28 insulatedly secure magnetic circuit base part 29. to container base 11.
  • relay frame 33 is shown to comprise an annular ring 34 attened on opposite sides as at 35 and rabbeted at 36 to enter cap 37 to which ring 34 is soldered in assembly.
  • Insulatedly and hermetically sealed within annular ring 34 by a filling of inorganic glass material 38 are magnetic circuit pole pieces 39, 4G, and electrical bushings 41 to 44 internally threaded to receive screws 45 to 48 for the purpose of securing stationary contact brackets 49, Sil in place as shown.
  • electromagnetic coils 51 and 52 are placed axially over pole pieces 39, 40 after which magnetic circuit base 29 'i ce i is riveted onto pole pieces 39, 40, all before magnetic base 29 is fixed to container base 11 by stud 27 and nut 3f..
  • the relayv magnetic circuit is seen to include magnetic base part 29, pole pieces 39, and reed 53, all of magnetic material.
  • the magnetic circuit is arranged to oe energized when an electric current is passed through coiis 51, 52 connected so that the magnetomotive forces of the two coils are additive in setting up the magnetic field in the magnetic circuit.
  • Two ends of the coils Si and SZ, not shown, are connected together while as shown in Fig. l the other two ends ci coils 51 and 52 are connected to relay terminals 16 and 15;
  • the magnetic circuit parts not electrically insulated one from the other so that by connecting base part to terminal 1S as shown, terminal 18 is electricaliy connected to reed 53 and the relay switch moving Contact 5S carried by reed 53 as shown in Figure 3.
  • Stationary contacts 56 and 57 of resilient non-magnetic electrically conducting material are seen in Fig. 3 to be welded at one end respectively to contact brackets d@ and 5i..
  • Contact bracket 49 insulatedly supported by screws 4 5, 46, set into bushings 41, 42 in glass 3S, seated into ring 3dof relay frame 33 is shown to be connected through bushing 42 to relay terminal
  • Contact bracket Sd insulatedly supported by screws fi?, 4S set into bushings 4.3, 44, in glass 38, sealed into ring 34 of relay frame 33y is indicated to be connected through bushing 44, not shown, to relay terminal 17.
  • opposing spring leaves 61, 62 have adjacent ends welded respectively to opposite sides of magnetic pole piece 4i), 54.
  • the free ends of leaves 61, 62 are oppositely resiliently biased against the opposite sides of reed 53.
  • Screws 63, 64, threadedly engaged through contact brackets 5i), 49 respectively are respectively adjustable to contact leaves 61, 62'with pressures determined for two distinct purposes.
  • One purpose is to position the free end of reed 53 away from pole piece 39 when coils 51, 52 are unenergized so that moving contact 55 will be in contact with stationary contact 56.
  • The'other important purpose is to adjust the biasing forces of leaves 61, 62 on reed 53 to resist the motion of reed S3 by the minute rubbing of leaves 61, 62 on reed 53 when reed 53 moves to shift movable contact 55 from one stationary contact 56 or 57 to the other.
  • screws 65, 66 threadedly engaged through contact brackets 50, 49 respectively are respectively adjustable to position resilient stationary contacts 57, 56 with respect to moving contact 55 in the respective two positions reed 53 will take when coils 51, 52 are energized or unenergized.
  • the teetering support of resilient contacts 57, 56 between the ends thereof by screws 65, 66 is effective in preventing contact bounce of moving contact 55 on striking either of the stationary contacts since on the attempt to bounce oli the contact 55 supported on reed 53 the energy of the reed is tirst absorbed by the yielding stationary contact less the frictional energy absorption of the friction leaves 61, 62 and then the remaining energy is returned to the reed 53 by the stationary contact against the friction energy absorption of leaves 61, 62. While the motions and energies are small the result of the combination of the reed with its biasing leaves and the resilient stationary contacts is to produce a relay switch with substantially no contact bounce.
  • each of the screws 63, 64, 65 and 66 are tipped with Pyrex glass on their inner ends so that no wear or-change of calibration will be caused by the slight rubbing when the reed structure is in motion of contacts 57, 56 on screws 65, 66 or of leaves 61, 62 on screws 63, 64.
  • the glass tips of screws 63, 64 also electrically insulate the vibrating reed structure from a respective stationary contact structure when the reed structure is in contact with the other stationary contact structure through the moving contact 55.
  • a mechanically stable high speed relay comprising an inorganic electrically insulating mechanically rigid base disk, a pair of spaced parallel magnetic pole pieces hermetically sealed in said base to extend from both sides thereof, a magnetic yoke connecting the ends of said pole pieces on one side of said disk, a magnetic resilient reed having one end tixed to the other end of one of said pole pieces on the other side of said disk, the free end of said reed, extending towards the other end of the other of said pole pieces on said other side of said disk to terminate there-alongside, a second resilient reed having one end lixed to said other end of said one of said pole pieces laterally spaced from said one end of said magnetic reed, the free end of said second resilient reed being biased against said free end of said magnetic reed to bias the free end of said magnetic reed away from said other end of said other of said pole pieces, and an electromagnetic coil surrounding part of the series magnetic circuit formed by said yoke, said pole pieces
  • the mechanically stable high speed relay of claim 1 including a third resilient reed having one end xed to said other end of said one of said pole pieces laterally spaced from said one end of said magnetic reed on the other side thereof from said one end of said second resilient -reed, the free end of said third resilient reed being biased against 4 said free end of said magnetic reed in opposition to the free end of said second magnetic reed.
  • the mechanically stable high speed relay of claim 2 including a movable contact moved by the free end of said magnetic reed as said magnetic reed is moved, a stationary contact structure insulatedly sealed in sai-d base to extend therefrom on the said other side thereof, said iirst stationary contact structure including a first stationary contact positioned to be contacted by said movable contact when said coil is deenergized and the free end of said magnetic reed is moved away from said other end of said other of said pole pieces by said tirst resilient reed.
  • the mechanically stable high speed relay of claim 3 including a second stationary contact structure insulatedly sealed in said base to extend therefrom on the said other side Ythereof spaced from said first stationary contact structure on the other side of said reeds therefrom, said second stationary contact structure including a second stationary contact positioned in opposition to said rst stationary contact to be contacted by said movable contact when said coil is energized and the free end of said magnetic reed is moved by the energy of said magnetic circuit towards said other end of said other of said pole pieces against the bias of said tirst resilient reed.
  • the mechanically stable relay of claim 3 in which said first stationary contact includes a first resilient part secured at one end to said first stationary contact structure with the other end of said first resilient part biased away from said movable contact and said lirst stationary contact structure includes a first adjustable means positioned to Contact said first resilient part between the Vends thereof adjustably rockably and resiliently to position the free end of said first stationary contact with respect to said movable contact.
  • said mechanically stable relay of claim 4 in which said second stationary contact includes a second resilient part secured at one end to sai-d second stationary contact structure with the other end of said second resilient part biased away from said movable contact and said second jstationary contact structure includes a second adjustable means positioned to contact said second resilient part between the ends thereof adjustably, rockably and resiliently to position the free end of said second stationary contact with respect to said movable contact.
  • said first stationary contact structure includes a third adjustable means positioned to contact said second resilient reed adjustably rockably and resiliently to position the free end of said magnetic reed by said second resilient reed.
  • said second stationary contact structure includes a fourth adjustable means positioned to contact sai-d third resilient reed adjustably rockably and resiliently to position the free end of said magnetic reed by said third resilient reed.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Description

Feb. 11, 1958 A. E. SPRANDO 2,823,281
HIGH SPEED RELAY Filed sept. 27, 195e M Wm 2,5 VTI United States arent HIGH SPEED RELAY Anthony E. Sprando, Portland, Greg., assigner to Iron Fireman Manufacturing Company, Portland, Oreg.
Application September 27, 1956, Serial No. 612,495 8 Claims. (Cl. 20G- 87) This invention reiates generally to electric relay mechanisms and more particularly to sensitive millisecond relays required to withstand mechanical or thermal shock or a wide range of mechanical vibration without loss of ycalibration or operating reliability.
It is a principal object of this invention to provide such a relay having no organic structural parts to vary in size, shape or position under thermal or mechanical shock or vibration.
It is a second object of this invention to provide such a relay designed to require no organic structural parts.
How these and other objects are attained is explained in the following description referring to the attached drawing in which Fig. l is a side elevation View in partial section of a relay with a single pole switch, the relay being made in accordance with the teaching of this invention and being encapsulated in a standard form of hermetically sealed container having the electric terminals for the relay insulatedly sealed through the end of the container in a well known standard pattern.
Fig. 2 is a view similar to Fig. l but with an additional relay encapsulated within the same container.
Fig. 3 is a View in plan section along the line 3-3 of Fig. l.
Fig. 4 is a fragmentary View in side elevation and partial section as viewed from the line 44 in Fig. 2.
Fig. 5 is a View in plan section along the line 5 5 of Fig. 4.
Like reference numerals refer to like parts in the several igures ofthe drawing.
Referring now to the drawing at 11 is shown a container base rabbeted at 12 to be received in the open end of container cup 13 to which base 11 is soldered in iinal assembly.
As shown in Figures 4 and 5 there are ten spaced electric terminals, 1d to 23, hermetically and insulatedly sealed with glass 24 into appropriate holes 25 in base 11. Metal axle 26 `fixed axially to base 11 is formed with a longitudinal rib, not shown, to require proper registration, in use, of terminals 14, 23 in a plug receptacle, not shown, common in the art. Fixed upwardly axially on base 11 is a stud 27 having its upper end threaded, as shown. Toroidal ceramic insulator 2-8 cored centrally to receive stud 27 has an upwardly extending neck, not shown, received by a mating centrally bored hole, not shown, in electromagnet base part 29. Insulating washer 30 resting on base part 29 together with lock washer 31, nut 32 and ceramic insulator 28 insulatedly secure magnetic circuit base part 29. to container base 11.
As particularly shown in Figures 3 and 4 relay frame 33 is shown to comprise an annular ring 34 attened on opposite sides as at 35 and rabbeted at 36 to enter cap 37 to which ring 34 is soldered in assembly. Insulatedly and hermetically sealed within annular ring 34 by a filling of inorganic glass material 38 are magnetic circuit pole pieces 39, 4G, and electrical bushings 41 to 44 internally threaded to receive screws 45 to 48 for the purpose of securing stationary contact brackets 49, Sil in place as shown.
As shown particularly in Figure 4 for pole piece 4t), electromagnetic coils 51 and 52 are placed axially over pole pieces 39, 40 after which magnetic circuit base 29 'i ce i is riveted onto pole pieces 39, 40, all before magnetic base 29 is fixed to container base 11 by stud 27 and nut 3f..
The upper or free ends oi both pole pieces 3d, 4t? have half round sections removed leaving diametral flat surfaces in the same plane on both pole pieces. Reed arinature 53 has one end positioned as shown and welded to the flat surface of pole piece 4t? after which segment 54 of pole piece d is replaced as shown and welded to reed 53 and pole piece 4i?. Normally the other end of reed 53 would lay` adjacent the ilat surface of pole piece 3?.
The relayv magnetic circuit is seen to include magnetic base part 29, pole pieces 39, and reed 53, all of magnetic material. The magnetic circuit is arranged to oe energized when an electric current is passed through coiis 51, 52 connected so that the magnetomotive forces of the two coils are additive in setting up the magnetic field in the magnetic circuit. Two ends of the coils Si and SZ, not shown, are connected together while as shown in Fig. l the other two ends ci coils 51 and 52 are connected to relay terminals 16 and 15; The magnetic circuit parts not electrically insulated one from the other so that by connecting base part to terminal 1S as shown, terminal 18 is electricaliy connected to reed 53 and the relay switch moving Contact 5S carried by reed 53 as shown in Figure 3.
Stationary contacts 56 and 57 of resilient non-magnetic electrically conducting material are seen in Fig. 3 to be welded at one end respectively to contact brackets d@ and 5i.. Contact bracket 49 insulatedly supported by screws 4 5, 46, set into bushings 41, 42 in glass 3S, seated into ring 3dof relay frame 33 is shown to be connected through bushing 42 to relay terminal Contact bracket Sd insulatedly supported by screws fi?, 4S set into bushings 4.3, 44, in glass 38, sealed into ring 34 of relay frame 33y is indicated to be connected through bushing 44, not shown, to relay terminal 17.
It is seen that of the ten relay terminals 14 to 23 set into container base 11 live are required when a single relay only is encapsulated in the container as shown in Fig. l of the live terminals used, 15 and 16 feed current to the operating coils 51, 52, 18 connects to the moving contact of the S. P. D. T. relay switch and 17 and 22 connect to the two stationary contacts of the relay switch. Thus tive terminals are needed for one relay and the additional live are available when an additional rely is encapsulated in the same container as shown in scheme in Fig. 2. It will be noticed in Figure 2 that the flattened edges 35 of rings 34 allow clearance from the inside of container cup 13 for the wires, not shown, from the upper end of the can to be brought down to the terminal end of cup 13 to conneet the second relay with the relay terminal. The particular terminals usedv for a particular purpose is a matter decided by the use to which the relay is put.
When a single relay is used it is ordinarily tightly supported in container 11, 13 as shown in Figure l by use of the cylindrical spacer .58 and the annularly rippled spring washer 59. When two relays are encapsulated in the same container 11, 13, switch cap 37 is not used the relays are turned switch end to switch end as shown in Figure 2 and securely relatively positioned by entering the rabbeted surfaces 36 of the respective relay base rings into the opposite ends of spacer 58. Ceramic insulating disl; 6l) is then used between the upper relay parts and the spring washer 59.
To return to the construction of the relay switch, it is seen in Figure 3 that opposing spring leaves 61, 62 have adjacent ends welded respectively to opposite sides of magnetic pole piece 4i), 54. The free ends of leaves 61, 62 are oppositely resiliently biased against the opposite sides of reed 53. Screws 63, 64, threadedly engaged through contact brackets 5i), 49 respectively are respectively adjustable to contact leaves 61, 62'with pressures determined for two distinct purposes. One purpose is to position the free end of reed 53 away from pole piece 39 when coils 51, 52 are unenergized so that moving contact 55 will be in contact with stationary contact 56. The'other important purpose is to adust the biasing forces of leaves 61, 62 on reed 53 to resist the motion of reed S3 by the minute rubbing of leaves 61, 62 on reed 53 when reed 53 moves to shift movable contact 55 from one stationary contact 56 or 57 to the other.
It should also be noticed that screws 65, 66 threadedly engaged through contact brackets 50, 49 respectively are respectively adjustable to position resilient stationary contacts 57, 56 with respect to moving contact 55 in the respective two positions reed 53 will take when coils 51, 52 are energized or unenergized. The teetering support of resilient contacts 57, 56 between the ends thereof by screws 65, 66 is effective in preventing contact bounce of moving contact 55 on striking either of the stationary contacts since on the attempt to bounce oli the contact 55 supported on reed 53 the energy of the reed is tirst absorbed by the yielding stationary contact less the frictional energy absorption of the friction leaves 61, 62 and then the remaining energy is returned to the reed 53 by the stationary contact against the friction energy absorption of leaves 61, 62. While the motions and energies are small the result of the combination of the reed with its biasing leaves and the resilient stationary contacts is to produce a relay switch with substantially no contact bounce.
It of course should be pointed out as a requirement of the disclosed rigid frame structure having no organic insulating parts that each of the screws 63, 64, 65 and 66 are tipped with Pyrex glass on their inner ends so that no wear or-change of calibration will be caused by the slight rubbing when the reed structure is in motion of contacts 57, 56 on screws 65, 66 or of leaves 61, 62 on screws 63, 64. The glass tips of screws 63, 64 also electrically insulate the vibrating reed structure from a respective stationary contact structure when the reed structure is in contact with the other stationary contact structure through the moving contact 55.
Having recited some of the objects of this invention and disclosed and described a preferred rform in which the invention may be practiced, the use, construction, adjustment and operation of the invention will be apparent to those skilled in the art.
I claim:
1. A mechanically stable high speed relay comprising an inorganic electrically insulating mechanically rigid base disk, a pair of spaced parallel magnetic pole pieces hermetically sealed in said base to extend from both sides thereof, a magnetic yoke connecting the ends of said pole pieces on one side of said disk, a magnetic resilient reed having one end tixed to the other end of one of said pole pieces on the other side of said disk, the free end of said reed, extending towards the other end of the other of said pole pieces on said other side of said disk to terminate there-alongside, a second resilient reed having one end lixed to said other end of said one of said pole pieces laterally spaced from said one end of said magnetic reed, the free end of said second resilient reed being biased against said free end of said magnetic reed to bias the free end of said magnetic reed away from said other end of said other of said pole pieces, and an electromagnetic coil surrounding part of the series magnetic circuit formed by said yoke, said pole pieces and said magnetic reed, said coil being adapted when energized to energize said series magnetic circuit to cause the free end of said magnetic reed to move against the bias of said second reed towards said other end of said other of said pole pieces.
2. The mechanically stable high speed relay of claim 1 including a third resilient reed having one end xed to said other end of said one of said pole pieces laterally spaced from said one end of said magnetic reed on the other side thereof from said one end of said second resilient -reed, the free end of said third resilient reed being biased against 4 said free end of said magnetic reed in opposition to the free end of said second magnetic reed.
3. The mechanically stable high speed relay of claim 2 including a movable contact moved by the free end of said magnetic reed as said magnetic reed is moved, a stationary contact structure insulatedly sealed in sai-d base to extend therefrom on the said other side thereof, said iirst stationary contact structure including a first stationary contact positioned to be contacted by said movable contact when said coil is deenergized and the free end of said magnetic reed is moved away from said other end of said other of said pole pieces by said tirst resilient reed.
4. The mechanically stable high speed relay of claim 3 including a second stationary contact structure insulatedly sealed in said base to extend therefrom on the said other side Ythereof spaced from said first stationary contact structure on the other side of said reeds therefrom, said second stationary contact structure including a second stationary contact positioned in opposition to said rst stationary contact to be contacted by said movable contact when said coil is energized and the free end of said magnetic reed is moved by the energy of said magnetic circuit towards said other end of said other of said pole pieces against the bias of said tirst resilient reed.
Y 5. The mechanically stable relay of claim 3 in which said first stationary contact includes a first resilient part secured at one end to said first stationary contact structure with the other end of said first resilient part biased away from said movable contact and said lirst stationary contact structure includes a first adjustable means positioned to Contact said first resilient part between the Vends thereof adjustably rockably and resiliently to position the free end of said first stationary contact with respect to said movable contact.
6. The mechanically stable relay of claim 4 in which said second stationary contact includes a second resilient part secured at one end to sai-d second stationary contact structure with the other end of said second resilient part biased away from said movable contact and said second jstationary contact structure includes a second adjustable means positioned to contact said second resilient part between the ends thereof adjustably, rockably and resiliently to position the free end of said second stationary contact with respect to said movable contact.
7. The mechanically stable relay of claim 3 in which said first stationary contact structure includes a third adjustable means positioned to contact said second resilient reed adjustably rockably and resiliently to position the free end of said magnetic reed by said second resilient reed.
8. The mechanically stable relay of claim 4 in which said second stationary contact structure includes a fourth adjustable means positioned to contact sai-d third resilient reed adjustably rockably and resiliently to position the free end of said magnetic reed by said third resilient reed.
References Cited in the le of this patent UNITED STATES PATENTS 2,013,513 Dressel Sept. 3, 1935 2,156,048 Baier et al. Apr. 25, 1939 2,247,469 Barrett July l, 1941 2,303,952 Plieger Dec. l, 1942 2,677,027 Woods Apr. 27, 1954 2,718,568 Somers Sept. 20, 1955 2,718,570 Caldwell Sept. 20, 1955 2,768,263 Callihan Oct. 23, 1956 2,774,846V Lee Dec. 18, 1956 2,791,662 Mertler May 7, 1957 FOREIGN PATENTS 241,291 Switzerland July l, 1946 412,209 France -l Apr. 27, 1910
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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR412209A (en) * 1910-01-31 1910-07-07 Mors Electricite Electric relays
US2013513A (en) * 1935-03-14 1935-09-03 Oak Mfg Co Vibrator
US2156048A (en) * 1937-05-15 1939-04-25 Lorenz C Ag Electric discharge device
US2247469A (en) * 1935-03-21 1941-07-01 Utah Radio Products Company Vibratory motor
US2303952A (en) * 1940-10-05 1942-12-01 Bell Telephone Labor Inc Relay
CH241291A (en) * 1942-10-02 1946-02-28 Fides Gmbh Contact arrangement.
US2677027A (en) * 1952-08-04 1954-04-27 North American Aviation Inc Chopper
US2718568A (en) * 1952-08-19 1955-09-20 Connecticut Valley Entpr Inc Rotary type relays
US2718570A (en) * 1954-02-05 1955-09-20 Conrad C Caldwell Electric vibrator contact dampening means
US2768263A (en) * 1955-01-06 1956-10-23 Pace Inc Switch mechanism
US2774846A (en) * 1954-04-12 1956-12-18 Westinghouse Electric Corp Thermostat apparatus
US2791662A (en) * 1954-08-02 1957-05-07 Stevens Mfg Co Inc Thermostat detent

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR412209A (en) * 1910-01-31 1910-07-07 Mors Electricite Electric relays
US2013513A (en) * 1935-03-14 1935-09-03 Oak Mfg Co Vibrator
US2247469A (en) * 1935-03-21 1941-07-01 Utah Radio Products Company Vibratory motor
US2156048A (en) * 1937-05-15 1939-04-25 Lorenz C Ag Electric discharge device
US2303952A (en) * 1940-10-05 1942-12-01 Bell Telephone Labor Inc Relay
CH241291A (en) * 1942-10-02 1946-02-28 Fides Gmbh Contact arrangement.
US2677027A (en) * 1952-08-04 1954-04-27 North American Aviation Inc Chopper
US2718568A (en) * 1952-08-19 1955-09-20 Connecticut Valley Entpr Inc Rotary type relays
US2718570A (en) * 1954-02-05 1955-09-20 Conrad C Caldwell Electric vibrator contact dampening means
US2774846A (en) * 1954-04-12 1956-12-18 Westinghouse Electric Corp Thermostat apparatus
US2791662A (en) * 1954-08-02 1957-05-07 Stevens Mfg Co Inc Thermostat detent
US2768263A (en) * 1955-01-06 1956-10-23 Pace Inc Switch mechanism

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