US2277411A - Step-up switch - Google Patents

Step-up switch Download PDF

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Publication number
US2277411A
US2277411A US247207A US24720738A US2277411A US 2277411 A US2277411 A US 2277411A US 247207 A US247207 A US 247207A US 24720738 A US24720738 A US 24720738A US 2277411 A US2277411 A US 2277411A
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US
United States
Prior art keywords
ratchet wheel
primary
pawl
driving
ratchet
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
US247207A
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English (en)
Inventor
Obszarny Thedore
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.)
Guardian Electric Manufacturing Co
Original Assignee
Guardian Electric Manufacturing Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE482388D priority Critical patent/BE482388A/xx
Application filed by Guardian Electric Manufacturing Co filed Critical Guardian Electric Manufacturing Co
Priority to US247207A priority patent/US2277411A/en
Application granted granted Critical
Publication of US2277411A publication Critical patent/US2277411A/en
Priority to GB4753/48A priority patent/GB646401A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/02—Non-polarised relays
    • H01H51/04—Non-polarised relays with single armature; with single set of ganged armatures
    • H01H51/06—Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the electromagnet is de-energised is returned by energy stored during the movement in the first direction, e.g. by using a spring, by using a permanent magnet, by gravity
    • H01H51/08—Contacts alternately opened and closed by successive cycles of energisation and de-energisation of the electromagnet, e.g. by use of a ratchet
    • H01H51/082—Contacts alternately opened and closed by successive cycles of energisation and de-energisation of the electromagnet, e.g. by use of a ratchet using rotating ratchet mechanism
    • H01H51/086—Contacts alternately opened and closed by successive cycles of energisation and de-energisation of the electromagnet, e.g. by use of a ratchet using rotating ratchet mechanism with radial ratchet elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H67/00—Electrically-operated selector switches
    • H01H67/02—Multi-position wiper switches
    • H01H67/04—Multi-position wiper switches having wipers movable only in one direction for purpose of selection
    • H01H67/06—Rotary switches, i.e. having angularly movable wipers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1558—Grip units and features
    • Y10T74/1565—Gripper releasing devices
    • Y10T74/1566—Power pawl lifter
    • Y10T74/1568—Automatic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1558—Grip units and features
    • Y10T74/1565—Gripper releasing devices
    • Y10T74/1576—Holding pawl lifter

Definitions

  • One of the objects of thisl invention is to provide a novel, simple, compact step-up switch which is ecient andpositive in operation, and rela- ⁇ tively inexpensive to manufacture.
  • Another object is to provide an improved switch of the character indicated, having spring means for returning the contact arm to starting position, under control of mechanical timing means, which permits step-by-step advancement of the contact arm only as long as the means for moving the arm is actuated successively Within predetermined periodic intervals of time.
  • a further object is to provide an improved switch of the character indicated, having a plurality of series of contacts and separate contact arms for each series, arranged for step-by-step registration with the respective series of contacts, and driving means including separately actuated elements for moving said arms sequentially and independently of each other.
  • Still another object of the invention is to provide an improved switch of the character indicated, having two series of contacts and separate contact arms therefor, arranged for stepby-step registration with said contacts, separately actuated elements for moving said arms sequentially and independently of each other, together with driving means for moving said elements in step-by-step fashion, said elements being formed for causing said driving means to rst operate upon one for a predetermined number of actuations and then upon the other of said elements.
  • FIG. 1 is a plan view of the step-up switch bodying the present invention.
  • Fig. 2 is a plan view of the switch looking from the opposite side with respect to Fig. 1.
  • Fig. 3' is a side elevation of the switch.
  • Fig. 4 is a view similar to Fig. 1, on an enlarged scale, with parts broken away and omitted, showing the mechanism in a position of adjustment in which the primary contact arm has beenI 'moved to its anal position of adjustment and the driving pawl is shown in position ready to coinmence actuation upon the secondary ratchet wheel for moving the secondary contact arm in step-by-step fashion.
  • Fig. 5 is a fragmentary view similar to Fig. 4, with portions broken away to show details of -shaft Il.
  • Fig. 6 is an enlarged View similar to Fig. 4, with certain parts omitted for clarity, showing the parts in position of adjustment at which the driving pawl is engaging the secondary check pawl to release the secondary ratchet wheel for returning same, together with the secondary contact arm, to starting position.
  • Fig. 7 is a top view of the switch mechanism.
  • Fig. 8 is a vertical section through the switch, taken as indicated at line 8--8 on Fig. 4.
  • Fig. 9 is a perspective view of the primary and secondary ratchet wheels.
  • Fig. 10 is a sectional view through the me chanical timing mechanism, taken as indicated at line III-I0 on Fig. 4.
  • a primary set of contacts indicated at I2, I2, I2b, I2c and I2d, which are carried on a panel of insulating material, indicated at I3, rigidly attached to said mounting member by screws I4.
  • a rotatable contact arm I5 for convenience hereinafter designated as the primary contact arm, which is staked to a bushing I6 loosely journaled on the Staked on the opposite end of said bushing is a primary ratchet wheel I8, and by virtue of which connection said ratchet wheel, bushing and primary contact arm are rotatable as a unit, in step-by-step fashion.
  • a disk 20 of insulatng material mounted on which is mounted a secondary series of contacts, indicated at 2I, 2
  • a secondary, rotata'ble contact arm 23 is staked to a bushing 24, which is rigidly attached by set screw 24a to the outer end of the shaft II for rotation therewith.
  • the secondary contact arm 23 is controlled by, and movable as a unit with, a secondary ratchet wheel 26, in step-by-step fashion; said ratchet mounting plate I0, in spaced-apart relation, as
  • the primary and secondary ratchet wheels I8 and 26 are herein designated as such merely for convenience, but, as may be-seen in Fig. 9 of the drawings, these elements are in the form of .segments and have only a portion of their periphery formed with teeth. More particularly, in the primary ratchet wheel I8 there are three main teeth, as indicated at I8a, and one special tooth, as indicated at I8b.
  • the ratchet wheel is moved, step-by-step, simultaneously moving the primary contact arm I over the corresponding contacts I2, I2b and I2C, and when the driving pawl engages the special tooth I8b the primary contact arm is moved into engagement or registration with the last of the contacts of the primary series, as indicated at I2d.
  • the lower portion of the primary ratchet wheel is formed with a notch, as indicated at I8, to form a hook for the closed loop of a tension spring 32, the other end of which spring is secured to a stud 33, carried on a bracket 33a which, in turn, is secured to the mounting plate I0.
  • the spring 32 when the ratchet wheel I8 is free, returns said ratchet wheel, together with the primary contact arm I5, to the starting position, such as indicated in Fig. 1.
  • the ratchet wheel is formed with an abutment shoulder I8, which ⁇ engages a stop member 34 carried by the bracket member 33a.
  • the secondary ratchet wheel is formed with a multiplicity of teeth, indicated at 26, which, desirably, should correspond in number to at least the number of contacts comprising the secondary series of contact members.
  • Said secondary ratchet wheel is also provided at its lower portion with an abutment shoulder 26b adapted to engage the stop 34 to arrest the ratchet wheel, together with the secondary contact arm 23, in an initial or starting position, as indicated in Figs. 2 and 4. It may be understood that said stop is formed of fibrous or like material, to reduce noise.
  • the secondary ratchet wheel 26 is, when free, caused to be returned, together with the secondary contact arn, to a starting position bymeans of a coil spring 38, circumscribing the end of the shaft II, projecting rearwardly beyond the clamp plate 30, and having one end extending intoK a slot II8l formed in the end of the shaft, the vother end of said spring being fixedly secured to the clamp plate 30.
  • the driving means for moving the primary and secondary ratchet wheels in step-by-step fashion includes an electro-magnet 40 mounted in a bracket 4I which, in turn, is secured to the mounting plate I0.
  • Said electro-magnet includes a core 42, with which cooperates an oscillatable armature 43, pivotally mounted at its lower end in the bracket 4I and yieldingly urged to its outermost position, as seen in Fig. 4, by means of a spring 44 having one end connected to the lower end of the armature, and the opposite end to a lug 4IEL of said bracket 4I.
  • the upper endv of the armature is provided with a bracket 46 in the form of a hook, engaging a flange of the end of the electro-magnet for limiting the -outward movement of the armature with respect to the core 42.
  • a carrier bracket 43 Rigidly connected to, and extending upwardly from, said armature is a carrier bracket 43, which is formed with a pair of spaced-apart ears 48a, in the upper ends of which are journaled the ends of a U-shaped bale or driving pawl 5U which, for convenience, is formed of a piece of relatively rigid wire.
  • Said driving pawl is yieldingly urged downwardly with the closed end thereof in position for engaging the teeth of either the primary or secondary ratchet wheels by means of a coil spring 5I having one end connected to and seated in a notch 5I)1 formed in one of the legs of the bale-like driving pawl, the opposite end of said spring being connected to the carrier bracket 48.
  • said driving pawl 50 upon being successively reciprocated by energization of the electro-magnet, advances the primary ratchet wheel I8, together with the primary contact arm I5, in step-by-step fashion, by engagement with the ratchet wheel teeth I8BL and the special tooth I8b and, after movement of theratchet wheel I8 by the driving pawl engaging the special tooth I8", said ratchet wheel is positioned, as seen in Fig. 4, so that in the next actuation of the driving pawl the closed end thereof rides beneath said special tooth and engages the teeth 26a of the secondary ratchet pawl 26, for advancing same, together with the secondary contact arm 23, in step-by-step adjustment.
  • the primary'check pawl is of bell crank type, including a rearwardly extending lever arm 56h, the end of which is formed with a hook 56 for engaging the loop end of a coil spring 58, the opposite end of which spring is secured by a pin 58 to the mounting plate.
  • the spring 58 tends to urge the lug 56 of the check pawl 55 into engagement with the teeth of the primary ratchet wheel.
  • the extreme end portion ofthe arm 55b is formed with a laterally extending lug 56dwith which engages the end of a spring-pressed sectorrack 59 of a mechanical timing mechanism, to be hereinafter described.
  • usaid segment is normally spring-pressed downwardly on said lug 56d to overcome the action of the coil spring 56, and normally maintains the lug 56a of the check pawl out of engagement with the teeth of the ratchet wheel.
  • the secondary check pawl 51 is formed at its rear lower portion with a hook 51b for engagement by the closed end of aspring 66', the opposite end of which is connected to said lug 56d of the lever arm 55h of said primarycheck pawl.
  • the spring 60 normally maintains the check pawl 51 in engage ment with the teeth of the'secondary ratchet wheel 26 for maintainingsame, together with its secondary contact arm 25, in the last position of step-by-step adjustment.
  • the forward end or nose of the secondary check pawl 51 is formed as a cam 51 disposed in the path of travel of the closed end of the bale-like driving pawl 50 during the movement of said pawl ,into engagement with the special tooth IBI of the primary ratchet ,wheell IE which, it will be apparent, and as seen in Fig. 6, raises the driving pawl slightly above its normal path of movement so that it engages cam-wise with said cam end 51 of the check pawl, lifting the lug 51li out of engagement with the teeth 2lia of the secondary ratchet wheel, thereby permitting said secondary ratchet wheel, together with the secondary contact arm 23. to be returned to starting position under iniiuence of spring 36.
  • said driving pawl acts cam-wise against the end of the secondaryJ check pawl 51., lifting same 'out of engagement with the teeth ⁇ of the secondary ratchet wheel 26', permitting same, together with the secondary contact arm 23, to be returned' to starting position.
  • said driving pawl 5U said pawl passes beneath the special tooth Illb of the primary ratchet wheel, and engages in thel rst tooth 26 of the secondary ratchet wheeLthereby advancing said ratchet wheel 26 simultaneously with the secondary contact arm 23.
  • any number of successive actuations thereafter of the driving pawl causes stepby-step advancement of the secondary ratchet wheel with the secondary contact arm to a desired position of adjustment for completing a portion of some predetermined electrical circuit through a corresponding contact with which the secondary contact larm is per ⁇ mitted to register.
  • 1t is desiredto complete merely a portion of some predetermined electrical circuit, including one of the respective contacts I2, I2h; I2c or I2, of the primary set of contacts, in which case the driving pawl 1s actuated a corresponding number of times to position the primary contact arm I5 in registration with the proper contact of said series.
  • the positioning of the respective contact arms in engagement Qwith a predetermined contact of either of the respective series of contacts is determined by the number of successive actuations of the driving pawl caused by magnetization of the' electro-magnet 46 and any convenient, wellknown means may be employed for imparting electrical current impulses u to the electro-magnet in a predetermined ⁇ number of uniformly timed intervals.
  • the rate of impulses of electric. current imparted to the electro-magnet for satisfactory and proper functioning of t-he mechanism should be between five and ten pulsations per second.
  • the timing mechanism herein disclosed is of a mechanical nature, and includes a frame member 6I mounted on studs 62 for supporting same in spaced relation to the mounting plate I0.
  • auxiliary frame or support 64 Supported from this frame member by means of studs 63 is an auxiliary frame or support 64, between which frame members is Journaled a shaft 65 on which is loosely mounted a pinion 66, meshed with the sector rack 59.
  • a coil spring 61 Surrounding said shaft 65 is a coil spring 61 having one end secured in said pinion, as seen in-Fig. 10, and the opposite end of which frictionally engages the hub of an escapement gear 68 journaled on the opposite end of the shaft 65.
  • Journaled in said frame members 6I, 6I is another shaft 69, on which is rigidly mounted a disk 10 carrying a pair of diametrically, oppositely disposed, laterally extending pins 1
  • the escapement gear 68 acts somewhat as a brake to maintain a uniform speed of rotation of the pinion 66 when 'actuated bythe segment rack 59.
  • the spring B'I constitutes a one way friction drive for the escapement gear 68, which is prevented from rotating in counterclockwise direction (as seen in Figure 4) by the pins 1I of the oscillatable disk 1I), during rotation of pinion 66 incident to the upward rocking movement of the segment gear 59.
  • the disk 'I0 oscillates, first projecting one of the pins 'I0 into engagement with the teeth of the escapement wheel 68 and which pin is then cammed out of engagement due to the shape of the teeth of said wheel, causing the opposite pin to be Y the segmental rack 5S is rocked upwardly about the pivot 'I2 in the end of the frame 6I, thereby rotating the pinion 66, and due to the action of pins 1I of disk 10, the spring 6l cannot frictionally rotate the escapement wheel 68.
  • the spring B1 Upon the return movement of the segment rack 59 the spring B1 is permitted to frictionally drive the escapement wheel 68, which is controlled by the action of pins II of the oscillatable disk 10, and thereby causes said wheel 68 to rotate at a uniform rate of speed.
  • Such rotation of the wheel 1 68 tends to maintain -a uniform speed of return movement of the segment rack, and which thereby provides a definite timing action for the period of time that said primary check pawl 56 is permitted to function to retain the primary ratchet wheel I8 in thelast position of adjustment attained by actuation of the driving p-awl 50.
  • Said segment rack is a two-piece construction, including a supporting body 14, to which the rack proper is pivoted at 15.
  • Said body portion 'I4 includes a vleg portion projecting downwardly from the mainV pivot 'I2 in position to be engaged by the carrier bracket 48 when the armature 43 is attracted to the core 42 of the electro-magnet, which action rocks the segment rack 59 in an upward direction, and which, as above described, disengages the end of the rack with the lug 56d of the primary check pawl, permitting the primary check pawl 56 to retain the primary ratchet wheel I8, together with the primary contact arm I5, in the last position of adjustment effected by actuation of the driving pawl 50.
  • the segment rack 59 is held in proper position tothe pinion 66 by a coil spring 'I8 connected to lugs 59a and 14a of the respective parts of the rack unit.
  • the rack unit including the operating armV 16, is yieldingly urged to the position seen in Fig. 4 by means of a coil spring 8l), connecting a lug Hb of said body portion of the segment rack unit, and -a lug 6Ia of the frame member 6I of the timer mechanism.
  • the step-up switch constituting the present invention is positive in operation and is relatively simple in construction as compared to equivalent step-up switches for performing similar functions; in fact, the number of parts utilized are substantially less, and the cost of manufacture is greatly reduced as compared with the equivalent type units that are now commercially available.
  • a primary ratchet wheel and a secondary ratchet wheel said ratchet wheels being mounted for rotation independently of each other, a reciprocating pawl for driving said ratchet. wheels and adapted upon one or more of a predetermined number of actuations for rotating the primary ratchet wheel in step-by-step adjustment, and means associated with and movable by the primary ratchet whefel into the path of travel of the driving pawl after said predetermined number of actuations to preclude further movement of the primary ratchet wheel by said pawl, Whereby further actuation of said driving pawl rotates the secondary ratchet wheel in step-by-step adjustment.
  • a shaft, a primary ratchet wheel and a secondary ratchet wheel said ratchet wheels being mounted on said shaft for rotation independently of each other, a reciprocating pawl for driving said ratchet wheels and adapted upon one or more of a predetermined number of actuations for rotating the primary ratchet wheel in step-by-stepadjustment, means associated with and movable by the primary ratchet wheel into the path of travel of the driving ypawl after said predetermn-ed number of actuations, to preclude further movement of the primary ratchet wheel by said pawl, whereby further actuation of said driving pawl rotates the secondary ratchet Wheel in stepby-step adjustment, one of said ratchet wheels being iixed on the shaft and the other free on said shaft, ⁇ spring means tending to rotate said shaft in opposition to operating direction of rotation of said fixed ratchet wheel, and spring means opposing movement of the loose ratche
  • a primary ratchet wheel and a secondary ratchet wheel said ratchet wheels being mounted for rotation independently .of each other, a reciprocating pawl for driving said ratchet wheels and adapted upon one or more of a predetermined number of actuations for rotating the primary ratchet wheel in step-by-step adjustment, means associated with and movable by the primary ratchet wheel into the path of travel of the driving pawl after said predetermined number of actuations to preclude further movement of the primary ratchet wheel by said pawl, whereby further actuation of said driving pawl rotates the secondary ratchet wheel in step-by-step adjustment, separate spring-pressed check pawls for the respective ratchet wheels, said last mentioned means comprising the last operating tooth of the primary ratchet wheel, formed as a cam for raising said driving pawl during its actuating stroke, and spring means for resetting said ratchet wheels to starting position, upon disengagement
  • a primary ratchet Wheel and a secondary ratchet wheel said ratchet wheels being mounted for rotation independently of each other, a reciproeating pawl for driving said ratchet wheels and adapted upon one or more of a predetermined number of actuations for rotating the primary ratchet wheel in step-by-step adjustment, and means comprising the last operating tooth of the primary ratchet wheel formed as a cam for raising said driving pawl after said predetermined number of actuations to preclude further movement ofthe primary ratchet wheel by said pawl, whereby further actuation of said driving pawl rotates the secondary ratchet wheel in step-bystep adjustment, the teeth of the primary ratchet wheel, comprising the angular range of movement of said wheel, being formed about a radius greater than the radius of the teeth of the secondary ratchet wheel, and the peripheral portion of said -primary ratchet wheel, beyond the last tooth thereof, and within the range of
  • a primary ratchet Wheel and a secondary ratchet wheel said ratchet wheels being mounted for rotation independently of each other, a recipro-4 cating pawl for driving said ratchet wheels and adapted upon one or more of a predetermined number of actuations for rotating the primary ratchet wheel in step-by-step adjustment, means associated with and movable by the primary ratchet Wheel into the path of travel of the driving pawl after said predetermined number of actuations to preclude further movement of the primary ratchet Wheel by said pawl, whereby further actuation of said drivingl pawl rotates the secondary ratchet wheel in step-by-step adjustment, separate spring-pressed check pawls for the respective ratchet Wheels, said last mentioned means comprising the last operating tooth of the primary ratchet Wheel, formed as a cam for raising said drivingpawl during its actuating stroke, and spring means for resetting said ratchet Wheels to starting position
  • a primary ratchet Wheel and a secondary ratchet wheel said ratchet wheels being mounted for rotation independently of each other, a reciprocating pawl for driving said ratchet Wheels and adapted upon one or more of a predetermined number of actuations for rotating the primary ratchet Wheel in stepby-step adjustment, means comprising the last operating tooth of the primary ratchet Wheel formed as a cam for raising said driving pawl after said predetermined number of actuations to preclude further movement of the primary ratchet Wheel by said pawl, whereby further actuation of said driving pawl 'rotates the secondary ratchet Wheel in step-by-step adjustment, the teeth of the primary ratchet Wheel comprising the angular range of movement oi said wheel being formed about a radius greater than the radius of the teeth of the secondary ratchet Wheel, and the peripheral portion of said primary ratchet wheel, beyond the last tooth thereof, and within the range of angular movement of the secondary
  • a primary ratchet wheel and a secondary ratchet Wheel said ratchet Wheels being mounted for rotation independently of each other, a reciprocating pawl for driving said ratchet wheels and adapted upon one or more of a predetermined number of actuations for rotating the primary ratchet wheel in step-by-step adjustment, means associated with and movable by the primary ratchet wheel into the path of travel of the driving pawl after said predetermined number of actuations to preclude further movement of the primary ratchet Wheel by said pawl, whereby further actuation f said driving pawl rotates the secondary ratchet wheel in step-by-step adjustment, separate spring-pressed check pawls for the respective ratchet wheels, said last mentioned means comprising the last operating tooth of the primary ratchet wheel, formed as a cam for rais- .ing said driving pawl during its actuating stroke, spring means for resetting said ratchet wheels to starting position
  • a ratchet wheel a reciprocating pawlfor driving said ratchet wheel and adapted upon one or more of a predetermined number of actuations for rotating said Wheel in step-by-step adjustment
  • electro-magnetic means adapted to be energized at periodic intervals of time and having an armature operably connected to said driving pawl, a spring-pressed check pawl for said ratchet wheel, spring means for resetting said ratchet Wheel to starting position upon disengagement of the check pawl, and gear and pinion type timing mechanism for controlling said check pawl for preceluding resetting of said ratchet Wheel to starting position during the time that said driving pawl is being successively actuated by said electro-magnetic means within periodic intervals of time, said timing mechanism including a segment gear having an operating arm positioned for engagement by the armature ofl the electro-magnetic means for energizing said mechanism, and an abutment shoulder adapted to

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transmission Devices (AREA)
  • Electromagnets (AREA)
US247207A 1938-12-22 1938-12-22 Step-up switch Expired - Lifetime US2277411A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE482388D BE482388A (enrdf_load_stackoverflow) 1938-12-22
US247207A US2277411A (en) 1938-12-22 1938-12-22 Step-up switch
GB4753/48A GB646401A (en) 1938-12-22 1948-02-18 An electromagnetically-operated step-by-step selector switch

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Application Number Priority Date Filing Date Title
US247207A US2277411A (en) 1938-12-22 1938-12-22 Step-up switch

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Publication Number Publication Date
US2277411A true US2277411A (en) 1942-03-24

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US247207A Expired - Lifetime US2277411A (en) 1938-12-22 1938-12-22 Step-up switch

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US (1) US2277411A (enrdf_load_stackoverflow)
BE (1) BE482388A (enrdf_load_stackoverflow)
GB (1) GB646401A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2837928A (en) * 1954-11-17 1958-06-10 Pines Engineering Co Inc Indexing and stroke control mechanisms for reciprocating devices
US2847534A (en) * 1955-03-24 1958-08-12 Gen Dynamics Corp Stepping switch
US3200577A (en) * 1961-11-07 1965-08-17 Gen Time Corp Single control for full feature timer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2837928A (en) * 1954-11-17 1958-06-10 Pines Engineering Co Inc Indexing and stroke control mechanisms for reciprocating devices
US2847534A (en) * 1955-03-24 1958-08-12 Gen Dynamics Corp Stepping switch
US3200577A (en) * 1961-11-07 1965-08-17 Gen Time Corp Single control for full feature timer

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Publication number Publication date
BE482388A (enrdf_load_stackoverflow)
GB646401A (en) 1950-11-22

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