US3126460A - Tseal - Google Patents

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Publication number
US3126460A
US3126460A US3126460DA US3126460A US 3126460 A US3126460 A US 3126460A US 3126460D A US3126460D A US 3126460DA US 3126460 A US3126460 A US 3126460A
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Prior art keywords
shaft
cam
switch
casing
arm
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H53/00—Cams or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G15/00—Mechanical devices for initiating a movement automatically due to a specific cause
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/22—Operating parts, e.g. handle
    • H01H21/30—Operating parts, e.g. handle not biased to return to a normal position upon removal of operating force
    • H01H21/34—Operating parts, e.g. handle not biased to return to a normal position upon removal of operating force adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/36—Driving mechanisms
    • H01H21/50—Driving mechanisms with indexing or latching means, e.g. indexing by ball and spring; with means to ensure stopping at intermediate operative positions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/22—Operating parts, e.g. handle
    • H01H21/24—Operating parts, e.g. handle biased to return to normal position upon removal of operating force
    • H01H21/28—Operating parts, e.g. handle biased to return to normal position upon removal of operating force adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
    • H01H21/285—Operating parts, e.g. handle biased to return to normal position upon removal of operating force adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift having an operating arm actuated by the movement of the body and mounted on an axis converting its rotating movement into a rectilinear switch activating movement

Definitions

  • This invention relates to switch control mechanisms of the type that are used in the automatic control of machinery including displaceable components such as sliders, carriages or the like.
  • displaceable components such as sliders, carriages or the like.
  • switches interposed adjacent the path of motion of the displaceable component and adapted for actuation by stops or fingers projecting from the component.
  • the switch when thus actuated may act to make and break energizing circuits for relay windings, contactors, solenoidoperated fluid valves, and for other electrical apparatus serving to control the desired automatic sequence of movements of the machinery.
  • Such arrangements are especially useful in connection with machine-tools, hoisting and handling equipment, e.g. lifts, in handling installations including conveyers, where such arrangements may be provided for counting and/or indicating the presence of articles carried on the conveyers, as well as in various other fields of engineering.
  • the manner of operation of the switches used and the character of the electric signals transmitted thereby when operated may differ according to the circumstances in which they are used.
  • a pair of switch contacts be closed or opened by a displaceable component of the controlled apparatus as said component is moving past the switch, and that said contacts will remain in their closed or open position until such time as the said component moves past again in the reverse direction, at which time they will be restored to their initial condition.
  • the lever or arm actuated by the mechanical component may have either one or two stable positions.
  • Switches designed for this type of operation are usually symmetrically constructed, with an actuating arm that has a stable midposition and is adapted to be deflected from that position to either right or left as the component moves past, and then being restored to its midposition by biasing means.
  • the switch has two stable positions, but is arranged to emit only a brief transient signal as it is shifted from one to the other of these positions.
  • a switch control device there is provided a versatile switch control mechanism capable of being quickly and easily reset to provide any selected one of a variety of modes of operation such for example as those listed above.
  • EX- perience has shown that there are many cases in practice where it would be entirely adequate to provide such mechanism making it possible to select one out of only two different modes of operation, or switch program sequences e.g. two opposite symmetrical sequences.
  • the present Ce Patented Mar. 24, 1964 invention concerns a switch control device wherein such dual selection is provided for.
  • an object of this invention to provide an improved arrangement for controlling the condition of an electric circuit under control of a moving part, and in accordance with either of two different programmed sequences. Another object is to provide such an arrangement which will be simple, robust, easy to operate and of a foolproof character. Further objects will appear as the disclosure proceeds.
  • an arrangement for controlling the condition of an electric circuit under control of a moving part and in accordance with either of two different programmed sequences comprising a switch connected to said circuit and having an actuating element displaceable to actuate the switch and thereby control the condition of the circuit; a rotatable shaft having an arm projecting therefrom for engagement by said moving part to rotate said shaft; a cam carried by the shaft and having a first peripheral contour portion presentable toward said switch-actuating element so as to actuate the switch on rotation of the shaft in accordance with a first programmed sequence as determined by the configuration of said first cam contour portion; means biassing said shaft to at least one stable angular position on disengagement of the arm by said part; disablable means for limiting the angular range of shaft rotation to a portion of a full circumference; and selectively operable means for momentarily disabling said limiting means so as to rotate the shaft beyond said angular range and thereby present a different contour portion of said cam
  • FIG. 1 is an exploded view in perspective, illustrating the principal components of the improved switch control mechanism of this invention
  • FIG. 2 is a side view, chiefly in axial longitudinal section, of the mechanism, in which the actuating arm and the switch unit are only partly shown;
  • FIG. 3 is a rear view of the mechanism shown in FIG. 2, with the cover, compression spring and second can removed for clarity;
  • FIG. 4a is a detail View, on the same plane as that of FIG. 3, showing the first cam of the mechanism and the ball actuated thereby, in a first setting of the mechanism for obtaining a first program sequence;
  • FIG. 4b is a view similar to FIG. 4a but illustrating the cam in the alternative setting, for providing a second program sequence.
  • the switch control mechanism shown comprises a casing 10 (see especially FIG. 2) having a bore therein in which is fitted a bearing sleeve 12.
  • a shaft 11 is rotatably and slidably mounted within the sleeve 12 and projects out of the casing.
  • the roller 14 is arranged to project into the path of motion of some moving part, such as a machine-tool slide or an elevator cage for example, so as to be struck by said part and thereby impart a rotational displacement to the shaft 11 at predetermined point or points of the motion of said part.
  • some moving part such as a machine-tool slide or an elevator cage for example
  • a first cam unit Secured around the shaft 11 within the casing 10 is a first cam unit including a peripherally contoured cam 39 and a pair of axially projecting diametrically opposed V-shaped ridges or teeth 31a and 3112 (also see FIG. 1).
  • the cam unit is an integral molding of superpolyamid resin and is press fitted around shaft 11, preferably around a castellated, flatted or fluted section of said shaft to improve the bond of the molding therewith.
  • a ball 7 is slidably and rollingly positioned within a suitable socket formed in casing 10 in register with the cam 30 so as to be actuated by it on rotation of the shaft, and said ball acts in turn upon a push-button 6 which constitutes the actuating element of a switch unit 1 of conventional construction, preferably of the type including a spring plate, such as a warped spring disk, actuatable between two oppositely sprung conditions by depression of the button 6. Switches of this type are well known in the art and for this reason the switch unit 1 has been shown herein only in general outline (FIG. 1).
  • the switch unit 1 may be supported through any suitable means, not shown, in fixed position with respect to the casing 10.
  • cam unit is formed with a stop pin, or preferably as shown two diametrically opposed stop pins 32 and 40 projecting from the transverse side face of the cam 30 opposite from the side thereof from which the teeth 31a and 31b project.
  • the said transverse face of cam 30 is abuttingly seated, in an annular area of said face positioned radially inwardly of the pins 32 and 40, against the adjacent end face of the sleeve 12, as will be clear from FIG. 2, thereby limiting the axial displacement of shaft 11 in the rightward direction.
  • Second cam 17 Seated against the other side of the cam unit 30, i.e. the side formed with the ridges 31a and 31b therein, is a second cam 17 which is formed with an opposite pair of V-shaped recesses 33a and 33b complementary to and cooperating with said V-shaped ridges of the first cam 30.
  • Second cam 17 is freely rotatable and slidable about the shaft 11 and is prevented from rotation relatively to the casing 10 by means such as a set of angularly spaced ears or lugs 17a received in notches such as 10a and 10b formed in the inner peripheral wall of casing 10 as shown in FIG. 3.
  • a compression spring 19 is coiled around the periphery of cam 17 and is seated at one end against an end cover 34 of casing 10, secured to the casing body with screws 35, and is seated at its other end against a flange of cam 17.
  • the spring 19 at all times urges the second cam 17 axially against the first cam 30 and simultaneously urges the shaft 11 around which cam 30 is secured, towards an axially abutted, operative position within the casing.
  • a pair of diametrically opposed stops 37 and 38 projecting inwardly from the surface 36 of casing 10 cooperate with the stop pins 32 and 40 of cam 30 to define the angular range of rotational displacement of said cam and hence shaft 11 within the casing 10, as will presently appear.
  • the two fixed stops 37 and 38 are shown diametrically opposite each other.
  • the angular range of permissible shaft displacement in each direction from its neutral position which displacement is indicated as the angles a in FIG. 3, will be somewhat less than owing to the circumferential thickness dimensions of the stop lugs 37 and 38 and the stop pin 32.
  • the fact that the maximum displacement in each direction from neutral is somewhat less than 90 further ensures that the V-shaped teeth or ridges 31a and 31b of cam 30 will not escape out of the notches 33a and 33b of cam 17.
  • cam 30 is symmetrical to opposite sides from a midline AC.
  • the cam is shown in the position assumed by it in the neutral or stable position of the shaft 11 carrying it.
  • the midline AC of the cam contour is horizontal (as shown in FIGS. 2 and 3), while the line shown at XX is vertical (as shown in those figures), i.e. extends through the center of ball 7 and switch pushbutton 6.
  • the contour ABDC includes a first large-radius portion AB followed by a brief connecting portion BD of decreasing radius, leading to the point D on the midline XX, and finally a smaller-radius portion DC extending over the remaining are of the contour.
  • cam 39 is symmetrical in both portions ABDC and ABD'C on opposite sides of cam diameter AC as in the illustrated embodiment, then the new type of operation of the system will be the following: on rotation of shaft 11 from neutral in direction F1 the switch will not be actuated and on rotation from neutral in direction F2 the switch will be actuated.
  • cam pattern described and shown is especially suitable, inter alia, for use in cases where the control device of the invention is associated with a reciprocating controlling object (for actuating arm 13 of the device) of heavy Weight, such as an elevator cage for example, apt to overshoot its end position.
  • a reciprocating controlling object for actuating arm 13 of the device
  • heavy Weight such as an elevator cage for example
  • a circuit for energizing a safety device of some kind may be energized as the elevator cage reaches and overshoots an end of its reciprocatory stroke as determined by the position of control device arm 13 thereby actuating arm 13 in one direction (F1, FIG. 4a), but will be deenergized again as the elevator cage moves back to Within the prescribed limits of its travel, thereby actuating arm 13 in the reverse direction (F2, FIG. 4a).
  • Cam contours suitable to provide such a program as well as any other programmed sequence of switch actuation and deactuation will be readily devised by those familiar with the art of automatic control.
  • the cam 17 instead of being formed with only two diametrically opposed notches or recesses 33a, 33b, may be provided with more, e.g. two pairs of diametrically opposed such recesses symmetrically disposed on opposite sides of the plane indicated by the line XX in FIG. 4a.
  • the shaft 11 instead of being provided in operation with a stable neutral position centrally of the range of shaft displacement, as described above, will have two stable end positions at both ends of its range of angular displacements, since the spring 19 will at all times be urging the assembly into one or the other of its two positions in which the ridges 31a, 31b of cam 30 are engaging one or the other of the two pairs of notches in cam 17, and these positions will then define the end points of the range of shaft displacement.
  • the stop lugs 37 and 38 on the casing may be provided spaced by an angle less than 180; in such case, after the shaft 11 has been rotated one half turn to alter the active contour of cam 30, the stop pin 40 earlier mentioned will serve to limit the shaft displacement instead of the stop pin 13.
  • the stop pin 40 shown herein may have utility in :all cases, including the embodiment specifically illustrated herein, in that the provision of the pair of pins 32 and 40 will serve to distribute the impact created on arresting the rotation of arm 13 as between the two stop pins.
  • the 6 arm 13- is shown as being recessed at 42 in one of its sides, the recess fitting freely over and around a projecting portion of the sleeve 12, or a corresponding projecting boss of the casing 10.
  • the relative dimensioning is such that when the arm 13 is secured in position upon the shaft 11 the bottom of the recess in the arm will abuttingly engage the outer end surface of the sleeve, or casing, before the stop pins 32, and 40 have moved clear of the stop lugs 37 and 38.
  • latching means thus provided are only exemplary, and may be replaced by some other latching means, not involving the arm 13, or may be altogether omitted.
  • An arrangement for controlling the condition of an electric circuit under control of a moving part and in accordance with either of two different programmed sequences comprising a switch having an actuating element displaceable to actuate the switch and thereby control the condition of said circuit; a casing; a shaft rotatable in the casing and having an arm projecting therefrom for engagement by said moving part to rotate said shaft; a first cam carried by the shaft and having a first peripheral contour portion presentable towards said switch-actuating element so as to actuate the switch on rotation of the shaft in accordance with a first programmed sequence as determined by the configuration of said first cam contour portion; a second cam non-rotatably mounted in said casing for axial sliding displacement relatively to said shaft coaxially therewith; complementary camming surfaces on said second cam and shaft respectively and spring means biassing said camming surfaces into mutual engagement thereby to urge said shaft to rotate to at least one stable angular position in the casing on disengagement of the arm by said part; disable stop means for limiting the angular range of
  • said complementary camming surfaces comprise a pair of diametrically opposed generally V-shaped camming ridges and a pair of complementary diametrically opposed camming recesses respectively.
  • stops include a stop projecting from said first cam and a pair of cooperating angularly spaced stops in said casing.
  • cam contour portions includes two concentric arcuate sections of different radius and an interconnecting intermediate section.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Transmission Devices (AREA)
  • Sheet Holders (AREA)
  • Push-Button Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)
US3126460D 1961-04-05 Tseal Expired - Lifetime US3126460A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR857825A FR79640E (fr) 1961-04-05 1961-04-05 Appareil interrupteur de commande mécanique par rencontre de mobiles

Publications (1)

Publication Number Publication Date
US3126460A true US3126460A (en) 1964-03-24

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US3126460D Expired - Lifetime US3126460A (en) 1961-04-05 Tseal

Country Status (8)

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US (1) US3126460A (OSRAM)
CH (1) CH385317A (OSRAM)
DE (1) DE1184397B (OSRAM)
ES (1) ES275985A2 (OSRAM)
FR (1) FR79640E (OSRAM)
GB (1) GB996521A (OSRAM)
LU (1) LU37633A1 (OSRAM)
NL (2) NL276396A (OSRAM)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3546954A (en) * 1966-07-22 1970-12-15 Buchanan Electrical Prod Corp Device for actuating a limit control element
US6716936B1 (en) 2002-12-16 2004-04-06 Equistar Chemicals L.P. Cascaded boiling pool slurry reactors for producing bimodal low to medium density polyethylene polymers
FR2943839A1 (fr) * 2009-03-30 2010-10-01 Schneider Electric Ind Sas Interrupteur de position
CN101499383B (zh) * 2008-01-31 2011-12-07 河南平高电气股份有限公司 一种高压开关设备上的导电管与导电管的电连接装置
WO2014117248A1 (en) * 2013-01-31 2014-08-07 Messier-Dowty Inc. Switch assembly and over-steer detection system
CN105097345A (zh) * 2014-05-23 2015-11-25 阿尔卑斯电气株式会社 旋转操作装置
US9896525B2 (en) 2015-04-29 2018-02-20 Exxonmobil Chemical Patents Inc. Homogeneous polymerization process using evaporative cooling
US9941063B2 (en) 2012-01-13 2018-04-10 Omron Corporation Limit switch and method for producing same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770926A (en) * 1972-07-27 1973-11-06 Allen Bradley Co Selector switch actuator with part of detent means integral with actuator cam

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2289643A (en) * 1941-06-09 1942-07-14 Furnas Cam type limit switch
US2522278A (en) * 1947-11-12 1950-09-12 Furnas Electric Co Cam type limit switch assemblage

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1212196A (fr) * 1958-09-11 1960-03-22 Telemecanique Electrique Appareil interrupteur de commande mécanique par rencontre de mobiles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2289643A (en) * 1941-06-09 1942-07-14 Furnas Cam type limit switch
US2522278A (en) * 1947-11-12 1950-09-12 Furnas Electric Co Cam type limit switch assemblage

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3546954A (en) * 1966-07-22 1970-12-15 Buchanan Electrical Prod Corp Device for actuating a limit control element
US6716936B1 (en) 2002-12-16 2004-04-06 Equistar Chemicals L.P. Cascaded boiling pool slurry reactors for producing bimodal low to medium density polyethylene polymers
CN101499383B (zh) * 2008-01-31 2011-12-07 河南平高电气股份有限公司 一种高压开关设备上的导电管与导电管的电连接装置
FR2943839A1 (fr) * 2009-03-30 2010-10-01 Schneider Electric Ind Sas Interrupteur de position
EP2237299A1 (fr) * 2009-03-30 2010-10-06 Schneider Electric Industries SAS Interrupteur de position
US9941063B2 (en) 2012-01-13 2018-04-10 Omron Corporation Limit switch and method for producing same
WO2014117248A1 (en) * 2013-01-31 2014-08-07 Messier-Dowty Inc. Switch assembly and over-steer detection system
CN105102328A (zh) * 2013-01-31 2015-11-25 梅西埃-道蒂公司 开关组件和过度转向检测系统
CN105097345A (zh) * 2014-05-23 2015-11-25 阿尔卑斯电气株式会社 旋转操作装置
CN105097345B (zh) * 2014-05-23 2017-05-17 阿尔卑斯电气株式会社 旋转操作装置
US9896525B2 (en) 2015-04-29 2018-02-20 Exxonmobil Chemical Patents Inc. Homogeneous polymerization process using evaporative cooling

Also Published As

Publication number Publication date
GB996521A (en) 1965-06-30
FR79640E (fr) 1962-12-28
LU37633A1 (OSRAM) 1960-03-08
ES275985A2 (es) 1962-06-01
NL276396A (OSRAM)
DE1184397B (de) 1964-12-31
CH385317A (fr) 1964-12-15
NL123490C (OSRAM)

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