US3858017A - Peripheral cam actuating a plurality of contact blades - Google Patents

Peripheral cam actuating a plurality of contact blades Download PDF

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Publication number
US3858017A
US3858017A US00420903A US42090373A US3858017A US 3858017 A US3858017 A US 3858017A US 00420903 A US00420903 A US 00420903A US 42090373 A US42090373 A US 42090373A US 3858017 A US3858017 A US 3858017A
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United States
Prior art keywords
electrical
carried
cam
spring contact
blade
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Expired - Lifetime
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US00420903A
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M Chioffi
M Bertozzi
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Emerson Electric Co
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Individual
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Assigned to EMERSON ELECTRIC CO. A CORP. OF MISSOURI reassignment EMERSON ELECTRIC CO. A CORP. OF MISSOURI ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EMHART INDUSTRIES, INC. A CORP. OF CONNECTICUT
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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
    • H01H19/62—Contacts actuated by radial cams

Definitions

  • a means for selectively completing a plurality of electrical circuits comprising a rotatable cam having at least four consecutive steps; at least four electrical terminals carried by an electrically insulative base in a line, spaced from and in line with the rotational direction of the cam; a first spring contact blade affixed at one end to a first electricalterminal at one end of the line, at least one electrical contact carried at a free end of the blade, and a cam follower carried between the fixed and free ends and responsive to the cam; a second spring contact blade affixed at one end to a second electrical terminal disposed next to the first electrical terminal; means carried by the base engaging a free end of the second spring contact blade to limit its travel; at least one electrical contact carried by the second spring contact blade between the fixed and free ends; a first
  • the present invention concerns an improvement in the arrangement of contacts and is particularly adoptable to cam driven electro-mechanical timers.
  • the timers commonly used for example, in electrical home appliances, such as clothes washers, dish washers and the like, include at least a small base or support of insulating material on which are mounted fixed or mobile contacts (contact springs) usually connected to current carriers in which the mobile contacts perform the electrical commutations to the fixed contacts under a mechanical drive supplied by rotating cams having a pre-fixed profile as a function of the desired commutation sequence.
  • the contact arrangements in timers of the described commonly used type are comprised of simple opening and closing contacts and/or exchange contacts.
  • the principal feature of the present invention is that of furnishing an improved contact arrangement for electro-mechanical contacts of the aforementioned type which enables the attainment of an additional contact closing (.and opening) in contrast to the well known type of arrangement.
  • FIG. 1 shows schematically the structure of the contact arrangement according to the present invention.
  • FIG. 2 shows a variation of the arrangement shown in FIG. 1.
  • a base 1 of insulating material sufficiently sturdy from a mechanical standpoint to maintain in place, the anchorings or electrical terminals 2, 3, 4, 5 spaced from cam 18 and substantially aligned directionally with its rotation.
  • Affixed to terminal 2 is a small metallic square 6 on which is carried an electrical contact pellet 7.
  • a first contact spring blade 8 arranged to exert force in the direction of the arrow F l, on the free end of which are carried electrical contact pellets 9, l0.
  • a second contact spring blade 11 arranged to exert force in the direction of the arrow F 2 and having a first electrical contact pellet 12 disposed in its center position with respect to its length, and a second electrical contact pellet 13 at its free end position.
  • the terminal end 14 of the spring 11 extends until coming into contact with the junction 15 in the small insulation base 1 to provide a means engaging the blade to limit its travel.
  • electrical contact pellet 16 is affixed to terminal 3.
  • the contact spring 8 is furnished, approximately in center position, with a tooth 17, the free end of which is arranged to engage the profile of rotating cam 18, shown only in part.
  • the cam 18 has four successive steps B, A, C, D, each defining four circumferences 20, 19, 21, and 22.
  • FIG. 2 is shown a variation of the FIG. 1 concept for the case in which a circuit closing between terminals 4 and 5 is not necessary or desired.
  • a spacer or insert 23 is mounted on spring 11 which, in correspondence with the rising of the tooth 17 controlled by zone D of the cam 18, controls the closing of contacts 12 and 16 and therefore the circuit between terminals 3 and 4.
  • the remainder of parts shown in FIG. 2 are identical to those in FIG. 1 and carry the same reference numbers.
  • Means selectively activating a plurality of electrical circuits comprising:
  • a first spring contact blade affixed at one end to a first electrical terminal at an end of said line, at least one electrical contact carried at a free end of said blade, and a cam follower carried between said fixed and free ends, said cam follower responsive to said cam,

Abstract

A four step cam operates electrical contacts to open and close electrical circuits to four electrical terminals which are spaced from and substantially in alignment with the rotational direction of the cam.

Description

O United States Patent [191 [111 3,858,017 Bertozzi et al. Dec. 31, 1974 PERIPHERAL CAM ACTUATING A [56] References Cited PLURALITY OF CONTACT BLADES UNITED STATES PATENTS [76] Inventors: Marcello Bertozzi, No. 47, Via 2,935,591 5/1960 Lee 200/ 153 LB Brighindi; Mario Chioffi, NO 84 2,938,970 5/1960 Constantine ZOO/38 B via Marittima 1 of Fr in ne HOiZ.el' B Italy 3,752,944 8/1973 Cartier et al. 200/38 B [22] Filed: 1973 A Primary Examiner-Robert K. Schaefer [21] APPL 420 903 Assistant Examiner-William J. Smith Attorney, Agent, or FirmCharles W. Hoffmann;
Robe t F. Me er; Donald W. H s [30] Foreign Application Priority Data r y an on July 12, 1973 Italy 51427/73 [57 ABSTRACT A four step cam operates electrical contacts to open zoo/153 2 2 43 and close electrical circuits to four electrical terminals [58] Fie'ld B 153 LB which are spaced from and substantially in alignment 200/38 BA, 27 BA, 27 BB, 6 B, 6 BB, 283, 246
with the rotational direction of the cam.
3 Claims, 2 Drawing Figures PAIENIED BEES I ma SHEET 2 OF 2 PERIPHERAL .CAM ACTUATING A PLURALITY OF CONTACT BLADES Generally speaking, there is provided in the present invention a means for selectively completing a plurality of electrical circuits comprising a rotatable cam having at least four consecutive steps; at least four electrical terminals carried by an electrically insulative base in a line, spaced from and in line with the rotational direction of the cam; a first spring contact blade affixed at one end to a first electricalterminal at one end of the line, at least one electrical contact carried at a free end of the blade, and a cam follower carried between the fixed and free ends and responsive to the cam; a second spring contact blade affixed at one end to a second electrical terminal disposed next to the first electrical terminal; means carried by the base engaging a free end of the second spring contact blade to limit its travel; at least one electrical contact carried by the second spring contact blade between the fixed and free ends; a first stationary electrical contact carried by a third electrical terminal disposed next to the second electrical terminal and cooperating with the electrical contact carried by the second spring contact blade; and a second stationary contact carried by a fourth electrical terminal disposed at another end of the line and cooperating with the electrical contact carried by the first spring contact blade.
The present invention concerns an improvement in the arrangement of contacts and is particularly adoptable to cam driven electro-mechanical timers.
The timers commonly used for example, in electrical home appliances, such as clothes washers, dish washers and the like, include at least a small base or support of insulating material on which are mounted fixed or mobile contacts (contact springs) usually connected to current carriers in which the mobile contacts perform the electrical commutations to the fixed contacts under a mechanical drive supplied by rotating cams having a pre-fixed profile as a function of the desired commutation sequence.
Normally, the contact arrangements in timers of the described commonly used type, are comprised of simple opening and closing contacts and/or exchange contacts.
The principal feature of the present invention is that of furnishing an improved contact arrangement for electro-mechanical contacts of the aforementioned type which enables the attainment of an additional contact closing (.and opening) in contrast to the well known type of arrangement.
The present invention will now be described with reference to its currently presented design as an illustrative and not limiting example, based on the attached drawings in which:
FIG. 1 shows schematically the structure of the contact arrangement according to the present invention.
FIG. 2 shows a variation of the arrangement shown in FIG. 1.
With reference to the drawings and particularly to FIG. -I, there is provided a base 1 of insulating material, sufficiently sturdy from a mechanical standpoint to maintain in place, the anchorings or electrical terminals 2, 3, 4, 5 spaced from cam 18 and substantially aligned directionally with its rotation.
Affixed to terminal 2, is a small metallic square 6 on which is carried an electrical contact pellet 7. To terminal 5 is affixed a first contact spring blade 8 arranged to exert force in the direction of the arrow F l, on the free end of which are carried electrical contact pellets 9, l0. Affixed to terminal 4, is a second contact spring blade 11, arranged to exert force in the direction of the arrow F 2 and having a first electrical contact pellet 12 disposed in its center position with respect to its length, and a second electrical contact pellet 13 at its free end position. The terminal end 14 of the spring 11 extends until coming into contact with the junction 15 in the small insulation base 1 to provide a means engaging the blade to limit its travel. Finally electrical contact pellet 16 is affixed to terminal 3.
The contact spring 8 is furnished, approximately in center position, with a tooth 17, the free end of which is arranged to engage the profile of rotating cam 18, shown only in part.
The cam 18 has four successive steps B, A, C, D, each defining four circumferences 20, 19, 21, and 22.
During the operation of the structure shown in FIG. 1, when the end of the tooth 17, engages zone A (neutral zone of the cam 18), the various contacts are found in the positions indicated and all circuits are open. When tooth 17 engages zone B (lower) of the cam 18, under the pre-load action of the spring 8 indicated by the arrow F l, the pellets 7 and 9 will enter into contact, closing the circuit between terminals 2 and 5. When tooth 17 engages zone C of the cam 18 (first upper) there will be contact between the pellets 10 and 13 with a pressure determined by the pre-load of the spring 11 indicated by the arrow F 2 and a circuit between terminals 4 and 5 will be closed. Finally when tooth 17 engages zone D of the cam (second upper) besides engaging pellets 10 and 13, there will also be an engagement of pellets 12 and 16 and therefore there will be a closing of the circuit between terminal 5 and terminals 3 and 4.
In FIG. 2, is shown a variation of the FIG. 1 concept for the case in which a circuit closing between terminals 4 and 5 is not necessary or desired. With this object in mind, a spacer or insert 23 is mounted on spring 11 which, in correspondence with the rising of the tooth 17 controlled by zone D of the cam 18, controls the closing of contacts 12 and 16 and therefore the circuit between terminals 3 and 4. The remainder of parts shown in FIG. 2 are identical to those in FIG. 1 and carry the same reference numbers.
What is claimed is:
1. Means selectively activating a plurality of electrical circuits comprising:
a. a rotatable cam, said cam having at least four successive steps,
b. at least four electrical terminals carried by an electrically insulative base in a line, spaced from and in alignment with the rotational direction of said cam,
c. a first spring contact blade affixed at one end to a first electrical terminal at an end of said line, at least one electrical contact carried at a free end of said blade, and a cam follower carried between said fixed and free ends, said cam follower responsive to said cam,
d. a second spring contact blade affixed at one end to a second electrical terminal disposed next to said first electrical terminal,
e. means carried by said base engaging a free end of of said line and cooperating with said electrical contact carried by said first spring contact blade.
2. Means according to claim 1 wherein spacer means is carried on said second spring contact blade, said 5 spacer means engaging said first spring contact blade.
3. Means according to claim 1 wherein there is another electrical contact carried at said free end of said second spring contact blade cooperating with another electrical contact carried at said free end of said first spring contact blade.

Claims (3)

1. Means selectively activating a plurality of electrical circuits comprising: a. a rotatable cam, said cam having at least four successive steps, b. at least four electrical terminals carried by an electrically insulative base in a line, spaced from and in alignment with the rotational direction of said cam, c. a first spring contact blade affixed at one end to a first electrical terminal at an end of said line, at least one electrical contact carried at a free end of said blade, and a cam follower carried between said fixed and free ends, said cam follower responsive to said cam, d. a second spring contact blade affixed at one end to a second electrical terminal disposed next to said first electrical terminal, e. means carried by said base engaging a free end of said second spring contact blade to limit its travel, f. at least one electrical contact carried by said second spring contact blade between said fixed and free ends, g. a first stationary electrical contact carried by a third electrical terminal disposed next to said second electrical terminal cooperating with said electrical contact carried by said second spring contact blade, and h. a second stationary electrical contact carried by a fourth electrical terminal disposed at another end of said line and cooperating with said eLectrical contact carried by said first spring contact blade.
2. Means according to claim 1 wherein spacer means is carried on said second spring contact blade, said spacer means engaging said first spring contact blade.
3. Means according to claim 1 wherein there is another electrical contact carried at said free end of said second spring contact blade cooperating with another electrical contact carried at said free end of said first spring contact blade.
US00420903A 1973-07-12 1973-12-03 Peripheral cam actuating a plurality of contact blades Expired - Lifetime US3858017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BR601574A BR7406015D0 (en) 1973-12-03 1974-07-19 DEVICE FOR SELECTIVELY ACTIVATING A PLURALITY OF ELECTRIC SWITCHES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT51427/73A IT991980B (en) 1973-07-12 1973-07-12 IMPROVEMENT IN THE ARRANGEMENTS OF CONTACTS FOR TIMERS ELET TROMECCA IOI WITH COMMAND OF MEDE SIMI VIA CAMS

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US3858017A true US3858017A (en) 1974-12-31

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US (1) US3858017A (en)
JP (1) JPS5053881A (en)
DE (2) DE2362384A1 (en)
FR (1) FR2237299B1 (en)
GB (1) GB1471993A (en)
IT (1) IT991980B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4117286A (en) * 1975-06-13 1978-09-26 J. & J. Marquardt Electric switch
US4490768A (en) * 1979-03-16 1984-12-25 Jeco Co., Ltd. Apparatus for preventing arc discharge of transfer switch circuit for inductive load
US20110204725A1 (en) * 2010-02-24 2011-08-25 Adrian Shipley Electromagnetic circuit interrupter
CN103487072A (en) * 2012-06-08 2014-01-01 博西华电器（江苏）有限公司 Household electric appliance, gear detection device thereof and combination of household electric appliance, cooker and smoke exhaust ventilator
US20140062626A1 (en) * 2012-08-31 2014-03-06 Fujitsu Component Limited Electromagnetic relay

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1053586B (en) * 1976-02-13 1981-10-10 Syntronic Ag IMPROVEMENT IN THE ELECTRICAL SWITCHING DEVICES OF THE CONTACTS OF A TIMER

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935591A (en) * 1958-06-23 1960-05-03 Westinghouse Electric Corp Electric oven control
US2938970A (en) * 1957-02-01 1960-05-31 Controls Co Of America Sequence timer
US3213217A (en) * 1960-11-22 1965-10-19 Holzer Walter Program delay control device
US3752944A (en) * 1971-11-01 1973-08-14 Controls Co Of America Timer blade arrangement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1518704A (en) * 1966-01-03 1968-03-29 Mallory Timers Continent Sequential timer with several predetermined advance intervals
DE1665978A1 (en) * 1967-02-25 1971-04-08 Siemens Elektrogeraete Gmbh Contact spring arrangement
BE729437A (en) * 1968-03-08 1969-09-08
JPS4837671A (en) * 1971-09-16 1973-06-02

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2938970A (en) * 1957-02-01 1960-05-31 Controls Co Of America Sequence timer
US2935591A (en) * 1958-06-23 1960-05-03 Westinghouse Electric Corp Electric oven control
US3213217A (en) * 1960-11-22 1965-10-19 Holzer Walter Program delay control device
US3752944A (en) * 1971-11-01 1973-08-14 Controls Co Of America Timer blade arrangement

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4117286A (en) * 1975-06-13 1978-09-26 J. & J. Marquardt Electric switch
US4490768A (en) * 1979-03-16 1984-12-25 Jeco Co., Ltd. Apparatus for preventing arc discharge of transfer switch circuit for inductive load
US20110204725A1 (en) * 2010-02-24 2011-08-25 Adrian Shipley Electromagnetic circuit interrupter
US8564389B2 (en) * 2010-05-24 2013-10-22 Ge Aviation Systems Limited Electromagnetic circuit interrupter
CN103487072A (en) * 2012-06-08 2014-01-01 博西华电器（江苏）有限公司 Household electric appliance, gear detection device thereof and combination of household electric appliance, cooker and smoke exhaust ventilator
US20140062626A1 (en) * 2012-08-31 2014-03-06 Fujitsu Component Limited Electromagnetic relay
US9007155B2 (en) * 2012-08-31 2015-04-14 Fujitsu Component Limited Electromagnetic relay
US9293286B2 (en) * 2012-08-31 2016-03-22 Fujitsu Component Limited Electromagnetic relay

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Publication number Publication date
GB1471993A (en) 1977-04-27
FR2237299B1 (en) 1977-09-23
JPS5053881A (en) 1975-05-13
IT991980B (en) 1975-08-30
FR2237299A1 (en) 1975-02-07
DE7344433U (en) 1976-06-03
DE2362384A1 (en) 1975-01-30

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Date Code Title Description
AS Assignment

Owner name: EMERSON ELECTRIC CO. A CORP. OF MISSOURI, MISSO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:EMHART INDUSTRIES, INC. A CORP. OF CONNECTICUT;REEL/FRAME:005691/0720

Effective date: 19910125