US3752944A - Timer blade arrangement - Google Patents

Timer blade arrangement Download PDF

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Publication number
US3752944A
US3752944A US00194184A US3752944DA US3752944A US 3752944 A US3752944 A US 3752944A US 00194184 A US00194184 A US 00194184A US 3752944D A US3752944D A US 3752944DA US 3752944 A US3752944 A US 3752944A
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US
United States
Prior art keywords
blade
cam
program member
follower
blades
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00194184A
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English (en)
Inventor
J Willigman
R Cartier
G Obermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eaton Corp
Original Assignee
Controls Company of America
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Filing date
Publication date
Application filed by Controls Company of America filed Critical Controls Company of America
Application granted granted Critical
Publication of US3752944A publication Critical patent/US3752944A/en
Assigned to CONTROLS COMPANY OF AMERICA, 9655 W. SORENG AVENUE, SCHILLER PARK, IL., A CORP. OF DE. reassignment CONTROLS COMPANY OF AMERICA, 9655 W. SORENG AVENUE, SCHILLER PARK, IL., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SINGER COMPANY, THE
Assigned to EATON CORPORATION, A CORP. OF OH. reassignment EATON CORPORATION, A CORP. OF OH. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CONTROLS COMPANY OF AMERICA
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H01H43/02—Details
    • H01H43/026—Contact arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/60—Angularly-movable actuating part carrying no contacts
    • H01H19/63—Contacts actuated by axial cams

Definitions

  • ABSTRACT The timer has switches including upper and lower pas sive blades and an active blade therebetween.
  • the distal end of the lower passive blade has depending spacers which straddle the cam upon which the follower on the distal end of the active blade rides.
  • the spacers reference the lower passive blade off the hub of the drum type program cam.
  • the lower passive blade is provided with a rest or stop for the upper passive blade limiting downward movement of that blade.
  • the distal ends of the passive blades were referenced by means of a guide block held between the end plates of the timer.
  • the guide block also received Teflon coated steel followers which, by reason of the positioning of the guide block, where quite accurately located on the projected diameter of the timing cam. The active blade end projected into the follower and accurate switching was thus attained.
  • FIGS. 1-5 improves over the patented construction just described by way of eliminating the guide block and the separate follower.
  • the lower passive blade has spacers which are referenced relative to the cam hub and thus accommodate any run-out in the hub shape without adversely affecting precision of switching. This eliminates tolerance problems encountered in the prior construction.
  • the construction also increases the accuracy of switching without increasing the precision of manufacture necessary to attain this increased accuracy. Furthermore, the friction of the follower in the guide block in the prior construction has been eliminated and, hence, the torque requirement to turn the cam is reduced to one half.
  • the construction incorporates integral electrical barriers on the blade assemblies to minimize the risk of arcing between adjacent blades. All of this has been attained with cost reduction in manufacture and in assembly.
  • a further advantage of the increased accuracy of switching resides in the fact the step (angle of rotation) for a given size cam drum can be reduced, thus making more steps available and, hence, more program information possible or, on the other side, the angular step can be maintained as in the past but the drum diameter and, hence, size of the overall timer can be reduced.
  • the basic construction is readily adapted to "flat timers as shown in FIGS. 6 and 7 while retaining the advantages already mentioned. Further, by providing two cam tracks whereby the passive" blades are also actuated as in FIG. 8 the switching time can be made shorter and permit application to "creep" type timers having flat cam or drum configuration.
  • the make-make arrangement can readily be incorporated in any of the foregoing.
  • FIG. ll shows in fragmentary form portions of a timer having a program cam operating the switches in radially opposed positions.
  • FIG. 2 is an end view as indicated in FIG. 1 showing the manner in which the spacers on the distal end of the blades straddle the cams operating the switches.
  • FIG. 3 is similar to a portion of FIG. 1 but illustrates the active blade in the mid position, that is with no circuit closed.
  • FIG. 4 is similar to FIG. 3 but shows the active blade closed on the lower passive blade.
  • FIG. 5 is an exploded perspective view partly in section further illustrating the construction.
  • FIG. 6 is a simplified plan view showing application of the concept to a flat program cam.
  • FIG. 7 is a simplified fragmentary view showing the preferred manner of application to the flat cam in FIG. 6.
  • FIG. 8 is a simplified view showing a double cam track arrangement for faster switching time.
  • FIGS. 9-11 show the concept applied to a makemake switching arrangement.
  • the program cam drum 10 islocated between the timer end plates for rotation in a counterclockwise direction as viewed in FIG. 1.
  • a cam In the foreground of FIG. 1 a cam has a maximum elevation portion 12, a mid portion 14 and a low portion 16.
  • the switch actuated by this cam has a plastic follower 18 molded on the distal end of active blade 20, the proximal end of which is embedded in a wafer 22 with the end of the blade projecting to provide a terminal 24.
  • the molded wafer 22 is the middle wafer of the three stacked wafers.
  • the bottom wafer 26 embeds passive blade 28 which has a molded assembly 30 on its distal end.
  • the assembly 30 constitutes a pair of depending spacers 32,32 which ride on the hub or inter-cam space of the cam drum 10 so as to straddle the cam 12,14,16 against which follower 18 is self-biased.
  • the assembly 30 also includes an electrical barrier 34 projecting upwardly at one side of the assembly to increase the effective spacing between adjacent switch assemblies to minimize arcing between adjacent switches.
  • the assembly 30 also includes a rest or stop 36 which limits the downward travel of the upper passive blade 38 which is embedded in the upper wafer 40 with its end also projecting to form a terminal 42. The lower passive blade also runs through the wafer to provide a terminal 44.
  • the follower 18 is riding on the highest portion 12 of the cam so as to lift the active blade and bring its contact 46 into engagement with the contact 48 carried by the upper passive blade.
  • the high portion of the cam 12 is selected so as to lift the distal end of the upper blade 38 off of stop 36 (against its self-bias) to insure good contact pressure.
  • the follower drops down to the mid portion 14 of the cam and at this point the distal end of the upper blade 38 rests on stop 36 and contact 46 on the active blade has moved away from contact 48 on the upper passive blade while contact 50 on the active blade has not moved down far enough to engage the contact 52 on the lower blade. Therefore, the circuits are open in this position.
  • the spacers 32 on the molded assembly 30 function to position the end of the lower blade and also provide the stop for the upper blade and, hence, determine the minimum spacing between contacts 48 and 52 on the upper and lower blades, respectively, accuracy is assured in this portion.
  • the molded tip including the follower 18 on the active blade is accurately located and since all of the wafers are stacked and this locates the root or proximal ends of the blades, accuracy is insured simply by proper mounting of the stacked wafers between the timer end plates. Thus it is only necessary to locate the wafers with some degree of precision and the follower will then be in the proper location and must be properly located relative to the passive blades.
  • the generally diametrically oriented surface of the follower 18 is on what might be termed the trailing side of the follower with respect to the direction of rotation of the cam drum.
  • the upper and lower switches have differently shaped followers relative to the overall assembly. This is to insure proper tracking on the cam surfaces.
  • the blades in the upper assembly (the same is true in the lower assembly) operate on alternate cam tracks with the opposed assembly of switches on the other side of the cam drum being operated by the other cams. Since the spacers reference off the cam hub, any run-out in the cam circumference is automatically compensated and will not affect switching accuracy. It will be noted, particularly in FIG. 2, that the spacing between the spacers and the cam is such that it is not possible to orientthe blades relative to the cam upon which they are to operate in such a way that the follower would miss" the cam, that is, fall between the cam and an adjacent spacer.
  • the activeblade molded followerand the assembly on the lower passive blade are preferably self-lubricating plastic such as Nylon or filled Nylon. Due to this factor and the elimination of the friction of the followers in the guide blocks as in the aforesaid patent, the torque required to rotate this assembly is about one half that found in the patent structure.
  • FIG. 5 an additional feature may be noted (it should be noted that this figure has no particular reference to the others, being representative only) in that the active blade in the left of the figure is provided with a laterally projecting arm 54 which includes a depending finger 56. This permits this blade to operate or be operated by a lever which is, in turn, operated by a subinterval cam. For example, this can interconnect a subinterval cam (old in the art) so as to determine when the subinterval switch is effective in conjunction with the program cam.
  • FIGS. 6 and 7 illustrate the adaptation of this concept to a flat program cam or face cam 60 having radially spaced recessed cam tracks 62.
  • the switches are positioned in this instance in a generally tangential relationship to the cam tracks with the actuation points lying on the radius in the interest of accuracy.
  • the passive blades are reference relative to the smooth surface 64 between the recessed cam tracks or grooves.
  • the spacer 66 molded on the end of the lower passive blade 68 has a rounded bottom designed to contact and ride on the smooth inter-cam surface 64.
  • the spacer includes the upwardly projecting finger portion 70 against which the upper passive blade 72 may rest when it is not being contacted by the active blade 74.
  • the active blade is provided with a follower 76 which rides in the cam track or groove 62 and in the illustrated position is in the neutral position since it is riding on surface 78.
  • the surface 80 will lift the active blade into contact with the upper blade 72 which will be lifted from the rest or finger 70. A little further cam movement will drop the follower into the deepest portion 82 of the groove 62 permitting the active blade to now contact the lower blade.
  • the switches in any assembly will operateon alternate cam tracks while the switch assembly or array on the opposite side of the cam face will be operated by the other set of alternate cams.
  • the passive blades referenced from a smooth portion of the program member.
  • the molded end fitting on the lower passive blade may include an electrical barrier 84 to minimize are over and permit reduction in spacing between adjacent switches.
  • the passive blade in the embodiments thus far described is referenced relative to the smooth surface (i.e. the hub or intergroove surface) and the active blade is the only blade which is moved by a cam track. If the program cam is operated in an intermittent or step-by-step fashion and the actual step is fast, the switching time will be fast. If it is desired toapply the same concept to a creep timer or to a steppingtimer in which more rapid switching time is desirable, it is possible to actuate the normally passive blade along with the active blade. This is illustrated in FIG. 8 where the active blade 86 has a follower 88 resting on the cam surface 90.
  • the lower blade 92 has a follower 94 resting in cam track 96 and including the upwardly projecting finger 100 as well as the electrical barrier 102.
  • the lower blade will be lifted so the follower rests on surface 104 while at the same time the active blade will drop off surface down tosurface 106.
  • the active blade moves down while the heretofore passive blade 92 moves up.
  • the rest also moves up and the effect is to catch the upper blade 108 on its way down (following movement) while at the same time allowing the active blade 86 to drop away from the upper blade, thereby breaking the circuit rapidly.
  • Increased switching speed can be achieved by this means to permit application of this construction to a creep-type timer whether that timer be the flat or face cam type or the drum type.
  • the switching action is essentially SPDT.
  • the switch arrangement may only be necessary to have the switch arrangement be SPST (using only two blades).
  • SPST using only two blades.
  • the upper blade 110 is provided with an integral molded spacer l 12 which has a curved contact or shoe portion riding on the smooth surface 114 be tween the cams.
  • the bias of the upper blade 110 will hold the spacer 112 against the smooth surface 114 but due to the resiliency of the blade, the blade and its follower can be elevated when indicated.
  • the free end of the middle blade 116 is biased against the rest or stop surface 118 on the follower.
  • the lower blade 120 is self-biased downwardly so that the follower 122 on the end of the blade will ride in the cam groove as illustrated in these drawings.
  • the upper pair of contacts can be opened first followed by opening of the second pair of contacts or all contacts could be opened substantially at once by having the follower 122 drop from the highest elevation 126 to the lowest in one step. While this description has been directed to application of the make-make circuit to a flat cam, it is obvious that this will work equally well in connection with a drumtype program cam.
  • a timer including a program member rotatable about an axis and provided with spaced cams
  • said switch including two blades the free ends of which are biased towards the program member,
  • said follower means including a stop limiting movement of the third blade towards the program mem her.
  • said follower means including a stop engageable by said third blade to limit movement of the third blade.
  • a timer according to claim 4 in which the first blade is actuated by the cam to first engage the third blade and upon continued motion to move the third blade from said stop into contact with the second blade.
  • said first blade being engageable with either the second or third blades and the blades moving into or out of contact may be moved in the desired direction simultaneously to increase the speed of switchmg.
  • a timer including a program member provided with spaced cams for operating switches and means for rotating the program member,
  • each of the switches including a blade having its proximal end fixed and its distal end including a contact and spacer means engaging the program member so as to reference the contact relative to the program member,
  • a second blade having its proximal end fixed relative to the first blade with its distal end including a contact and a depending follower engaging one of the cams on the programmember
  • the second blade being self-biased to urge the follower into engagement with the cam whereby the second blade is actuated in accordance with the configuration of the cam to open and close said contacts in a programmed sequence.
  • said switches being disposed in generally tangential relationship to the earns.
  • a timer according to claim 7 in which the program member is cylindrical with the cams axially spaced along the cylinder and the switches are disposed in generally tangential relationship to the cylinder.
  • Apparatus according to claim 7 including an electrical barrier projecting from one of the blades between it and the adjacent blades of the adjacent switch a sufficient height to electrically shield the contacts associated with the first switch from the adjacent switch contacts.
  • a third blade having its proximal end fixed relative to the first and second blades and having its distal end overlying said stop and having a contact adapted to be engaged by the second blade contact
  • said third blade being self-biased against said stop and movable upwardly therefrom in response to elevation of the second blade by the cam to close the second blade contact on the upper blade contact. 14.
  • a timer including a program member having spaced cams
  • each of said switches including a blade having its free end self-biased towards said program member and including a spacer acting on the program member to reference the blade relative thereto,
US00194184A 1971-11-01 1971-11-01 Timer blade arrangement Expired - Lifetime US3752944A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19418471A 1971-11-01 1971-11-01

Publications (1)

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US3752944A true US3752944A (en) 1973-08-14

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Application Number Title Priority Date Filing Date
US00194184A Expired - Lifetime US3752944A (en) 1971-11-01 1971-11-01 Timer blade arrangement

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US (1) US3752944A (fr)
JP (1) JPS5531975B2 (fr)
AU (1) AU466641B2 (fr)
CA (1) CA942364A (fr)
DE (1) DE2245873C3 (fr)
FR (1) FR2158345A1 (fr)
IT (1) IT969013B (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858017A (en) * 1973-07-12 1974-12-31 M Bertozzi Peripheral cam actuating a plurality of contact blades
US4060702A (en) * 1976-01-09 1977-11-29 Wallace Leon Linn Timer switch assembly having escapement mechanism
US4130744A (en) * 1977-04-25 1978-12-19 Bell Telephone Laboratories, Incorporated Cam actuated multiple contact spring switch
US4366352A (en) * 1980-08-29 1982-12-28 The Singer Company Two-speed continuous drive timer
US4381432A (en) * 1981-06-01 1983-04-26 General Electric Company Electromechanical timer with improved short interval accuracy
US4413164A (en) * 1982-04-22 1983-11-01 The Singer Company Timer with manual means for disabling a switch
US4490768A (en) * 1979-03-16 1984-12-25 Jeco Co., Ltd. Apparatus for preventing arc discharge of transfer switch circuit for inductive load
US4531028A (en) * 1983-12-27 1985-07-23 Emhart Industries, Inc. Timer with improved switch blade arrangement
US4604504A (en) * 1983-04-25 1986-08-05 Emhart Industries, Inc. Timer blade arrangement
US4892983A (en) * 1988-12-08 1990-01-09 Eaton Corporation Programmer/timer with combined line and program function switch
US4912939A (en) * 1989-02-28 1990-04-03 Eaton Corporation Making ice in a refrigerator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5548527Y2 (fr) * 1975-05-13 1980-11-13
JPS5468183U (fr) * 1977-10-25 1979-05-15

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118982A (en) * 1960-12-01 1964-01-21 Ranco Inc Cam operated timing device
US3221116A (en) * 1962-07-24 1965-11-30 Chester J Later Ignition system for internal combustion engines
US3472976A (en) * 1967-12-01 1969-10-14 North American Rockwell Contact operating mechanism
US3478181A (en) * 1966-03-10 1969-11-11 Edward Thomas Buckerridge Electric circuit controllers incorporating time-switches
US3679988A (en) * 1970-11-10 1972-07-25 Tri Tech Cam actuated switch assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118982A (en) * 1960-12-01 1964-01-21 Ranco Inc Cam operated timing device
US3221116A (en) * 1962-07-24 1965-11-30 Chester J Later Ignition system for internal combustion engines
US3478181A (en) * 1966-03-10 1969-11-11 Edward Thomas Buckerridge Electric circuit controllers incorporating time-switches
US3472976A (en) * 1967-12-01 1969-10-14 North American Rockwell Contact operating mechanism
US3679988A (en) * 1970-11-10 1972-07-25 Tri Tech Cam actuated switch assembly

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858017A (en) * 1973-07-12 1974-12-31 M Bertozzi Peripheral cam actuating a plurality of contact blades
US4060702A (en) * 1976-01-09 1977-11-29 Wallace Leon Linn Timer switch assembly having escapement mechanism
US4130744A (en) * 1977-04-25 1978-12-19 Bell Telephone Laboratories, Incorporated Cam actuated multiple contact spring switch
US4490768A (en) * 1979-03-16 1984-12-25 Jeco Co., Ltd. Apparatus for preventing arc discharge of transfer switch circuit for inductive load
US4366352A (en) * 1980-08-29 1982-12-28 The Singer Company Two-speed continuous drive timer
US4381432A (en) * 1981-06-01 1983-04-26 General Electric Company Electromechanical timer with improved short interval accuracy
US4413164A (en) * 1982-04-22 1983-11-01 The Singer Company Timer with manual means for disabling a switch
US4604504A (en) * 1983-04-25 1986-08-05 Emhart Industries, Inc. Timer blade arrangement
US4531028A (en) * 1983-12-27 1985-07-23 Emhart Industries, Inc. Timer with improved switch blade arrangement
US4892983A (en) * 1988-12-08 1990-01-09 Eaton Corporation Programmer/timer with combined line and program function switch
US4912939A (en) * 1989-02-28 1990-04-03 Eaton Corporation Making ice in a refrigerator

Also Published As

Publication number Publication date
IT969013B (it) 1974-03-30
AU466641B2 (en) 1975-11-06
AU4501172A (en) 1974-01-31
JPS5531975B2 (fr) 1980-08-22
DE2245873A1 (de) 1973-05-10
FR2158345A1 (fr) 1973-06-15
DE2245873B2 (de) 1977-06-16
DE2245873C3 (de) 1978-11-02
CA942364A (en) 1974-02-19
JPS4853270A (fr) 1973-07-26

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STCF Information on status: patent grant

Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES)

AS Assignment

Owner name: CONTROLS COMPANY OF AMERICA, 9655 W. SORENG AVENUE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:004505/0515

Effective date: 19860110

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Owner name: EATON CORPORATION, EATON CENTER, 1111 SUPERIOR AVE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CONTROLS COMPANY OF AMERICA;REEL/FRAME:004614/0433

Effective date: 19861002