US3693033A - Key operated pulse generating device - Google Patents

Key operated pulse generating device Download PDF

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Publication number
US3693033A
US3693033A US3693033DA US3693033A US 3693033 A US3693033 A US 3693033A US 3693033D A US3693033D A US 3693033DA US 3693033 A US3693033 A US 3693033A
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Prior art keywords
magnet
coil
body
housing
end
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Expired - Lifetime
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Donald L Troesh
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ELECTROMECHANISMS Inc
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ELECTROMECHANISMS Inc
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K35/00Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
    • H02K35/02Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving magnets and stationary coil systems
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K39/00Generators specially adapted for producing a desired non-sinusoidal waveform

Abstract

A key operated electric pulse generator comprising a housing of non-magnetic material supporting depressible key at one end, a coil at the other end, and a body of magnetic material spaced from the coil. A permanent magnet is supported in the housing for movement between the magnetic body and the coil and is normally magnetically attracted to the magnetic body. A spring is interposed between the permanent magnet and the depressible key so that upon depression of the key the spring will yield a certain amount and then cause the magnet to abruptly release from the magnetic body and be impelled toward the coil to generate an electric signal.

Description

"M [451 Sept. 19, 1972 KEY @PERATED PULSE GENERATING 3,132,268 5/1964 Abel et al. ..310/15 DEVHQE 72 Inventor: Donald L. Troesh, Ontario, Calif. Pnmay ExammehD Dugga Att0rney-Fred N. Schwend [73] Assignee: Electromechanisms, lnc., Azusa,

Cahf- 57 ABSTRACT [22] Filed: June 1971 A key operated electric pulse generator comprising a 2 AWL 156,318 housing of non-magnetic material supporting depressible key at one end, a c011 at the other end, and a body of magnetic material spaced from the coil. A per- [52] US. Cl ..310/14, 310/15 manem magnet is supported in the housing for move [51] Int. Cl. ..HOZk 35/00 mem between the magnetic body and the coil and is [58] Field (It Search ..310/12-15, 30 normally magnetically attracted to the magnetic body A spring is interposed between the permanent magnet [56] References and and the depressible key so that upon depression of the UNITED STATES PATENTS key the spring will yield a certain amount and then cause the magnet to abruptly release from the mag- 3,116,428 12/1963 Blodgett et a1. ..3 10/ 15 netic body and be impelled toward the i to generate 3,065,366 11/1962 Sperser et al. ..310/15 an elecm-c signal 3,398,302 8/1968 Hamau et a1. ..310/14 3,153,735 10/1964 Branagan et a1 ..310/15 4 Claims, 3 Drawing Figures mmransmsmz 3,693,033

8 vours 5 mnusecouo Ill INVENTOR. DONALD L. T9055 BY XMXM BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to key controlled electric pulse generating means.

2. Description of the Prior Art Heretofore, manually controlled electric pulse or signal transmitting devices for controlling electronic or the like equipment generally comprised key operated contact opening or closing devices. Such devices require a standby electrical circuit which is made or broken by depression of a key. Also, the contacts of such switches tend to wear and to become oxidized or corroded after extensive use, resulting in unreliable switching operation. Further, such contacts tend to bounce, which, when the contacts are in circuit with sensitive electronic equipment, gives rise to spurious and unwanted pulse signals.

Attempts have been made to overcome the above problems by providing a key operated permanent magnet which is moveable relative to a coil to generate an electric signal as the magnetic field of the magnet cuts across the windings of the coil. Although such pulse generating devices work generally satisfactorily, the size and wave form of the signal generated is dependent upon the speed and abruptness with which the key is depressed. Thus, if the key is depressed too slowly, the resulting signal may be of insufficient size or shape to adequately and reliably control a signal responsive device.

SUMMARY OF THE INVENTION The present invention overcomes the above problem by providing a permanent magnet which is coupled to a depressible key through a yieldable spring, and which by virtue of its magnetic attraction to a stationary magnetic body, forms the sole means of maintaining itself spaced from an electric signal generating coil; Upon a predetermined depression of the key and consequent deformation of the spring, the magnet will abruptly release from the body and will advance toward the coil at a maximum rate under the impetus of the spring to generate a sharply peaked signal pulse. It should be noted that the size and shape of the wave form of such generated signal pulse will be substantially consistent regardless of the speed or abruptness with which the key is depressed. Further, applicants construction results in a compact, self-contained pulse generating device which is adapted to be easily and readily mounted on a panel or the like. The construction also results in a compact and economically manufactured and assembled device having relatively few moving parts, has an extremely long operating life and may be safely used in explosive and other dangerous environments.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a longitudinal sectional view through a key operated pulse generating device embodying a preferred form of the present invention.

FIG. 2 is a transverse sectional view taken substantially along the line 2-2 of FIG. 1.

FIG. 3 is a diagram of a wave form generated by the device ofFlGS. l and 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawing, the device comprises a hollow cylindrical housing 11 which is preferably molded of plastic or other non-magnetic material. The housing is reduced in diameter at its righthand end and has a threaded section 12 adapted to be mounted in an opening in a panel or other supporting member 13. The housing is secured to the panel by lock nuts 14 and 15 threaded on the section 12.

A depressible key comprising a tubular keystem 16, also of plastic and having a key top 17 attached to its outer end, is slideable endwise in a bore 18 formed in the housing. The inner end of the keystem 16 has a flange 20 normally abutting a shoulder 21 in the housing to limit movement of the key.

A cylindrical cavity 22 is formed in the housing and communicates with the bore 18 through an intermediate cylindrical cavity 23.

A cup shaped magnetic body comprising a disc 24 and a ring 25 fitted in the cavity 22 is held in place against a shoulder 29 by a plastic ring 26 and a coil bobbin 27, the latter being press fitted in the cavity 22.

The bobbin 27 comprises a tubular core 28 of magnetic material having a low magnetic retentivity and a high magnetic permeability, such as is commercially available under the trade name Armco" iron. The core 28 is supported at opposites ends by flanges 30 and 31 of plastic or other non-magnetic material. A coil 32 of wire is wound on the core 28 and its ends are electrically connected to terminal strips 33 and 34 for connection to a suitable circuit (not shown) to be controlled by depression of the key.

The disc 24 and ring 25 are formed of magnetic material, such as Armco" iron, having a low magnetic retentivity.

A plunger 35 of non-magnetic material, such as brass, is slideably mounted at one end thereof in the core 28 and at the opposite end thereof in the keystem 16 for endwise movement. An annular permanent magnet 36 is mounted on the plunger and is held between annular discs 37 and 38, which, in turn, are held in place on the plunger by two spring clips 40 and 41 of non-magnetic material. The magnet 36 is formed of a magnetic material having a high degree of magnetic retentivity, such as is available under the trade name Alnico" and the discs 37 and 38 are formed of a magnetic material, such as Armco iron, having a low magnetic retentivity and high permeability.

A compression spring 42 surrounds the plunger 35 and extends between the clip 41 and the flange 20 of the keystem l6.

Normally, when the key 17 is in its illustrated undepressed condition, the magnet 36 is attracted to the disc 24, thus lightly compressing the spring 42 to hold the key in its outer illustrated undepressed position. In such condition, the magnet 36 and discs 37 and 35 are maintained within the ring 25 and the magnetic flux developed by the magnet extends generally through the disc 38, disc 24, ring 25 and across the annular air gap 43 to the disc 37. The discs 37 and 38 tend to concentrate the magnetic flux therethrough and convey the same to and from the magnet 36.

Upon depression of the key 17 through the latter portion of its full stroke and consequent compression of the spring 42, the latter suddenly overcomes the force of attraction of the magnet 36 and impels the magnet and the plunger 35 at a high rate of speed towards the coil 32. Accordingly, the magnetic flux path abruptly changes due to the increasing air gap between the discs 24 and 38 and the receding of the magnet from within the ring 25. The flux path now abruptly expands endwise toward the coil 32. At the same time, due to the rapid movement of the magnet 36 toward the coil, the lines of force of the magnetic flux rapidly cut across the windings of the coil to develop an electric pulse or signal having a sharply peaked rise in voltage as depicted in FIG. 3. The core 28 tends to convey the lines of magnetic force therealong to distribute the same throughout the coil 32.

H6. 3 illustrates wave form developed from a device constructed according to FIG. 1 having a coil 32 formed of No. 46 copper wire with a total resistance of 3,000 ohms.

Upon release of the key 17 from depressed position, the magnet will again attract to the disc 24 and the ring 25 to return the parts to their illustrated positions.

I claim:

1. A pulse generating device comprising a housing,

a coil in said housing adjacent one end of said houssaid coil having a hollow core,

a manually depressible key having a hollow keystem slidably supported by said housing adjacent the opposite end of said housing for endwise movement;

a plunger in said housing slidably supported at one end thereof in said core and at the opposite end thereof in said keystem for endwise movement,

spring means for yieldably transferring endwise movement between said keystem and said plunger,

a body of magnetic material fixed in said housing,

and

means forming a permanent magent fixed on said plunger,

said magnet being normally magnetically attracted to said body and spaced from said coil, and

said spring means being effective upon a predetermined depression of said key to cause said magnet to release from said body and to approach said coil whereby to generate an electrical pulse in said coil.

2. A pulse generating device according to claim 1 comprising a member of magnetic material having rela tively low magnetic retentivity attached to one end of said magnet and engagable with said body when said magnet is attracted to said body.

3..A pulse generating device according to claim 1 wherein said body is cup-shaped and has a radially inwardly extending end,

a pair of members of magnetic material having relatively low magnetic retentivity attached to opposite ends of said magnet,

one of said members normally engaging the radially extending end of said body,

said magnet extending within said body when said magnet is attracted to said body whereby to form a substantially enclosing magnetic fluxpath for said magnet, and

said magnet receding at least partially from within id 0d d rin ovement toward said coil w iiere by ihe l i nes o magnetic force developed by said magnet will move across the windings of said coil. 4. A pulse generating device according to claim 3 comprising a core within said coil,

said core comprising a magnetic material having a relatively low magnetic retentivity.

Claims (4)

1. A pulse generating device comprising a housing, a coil in said housing adjacent one end of said housing, said coil having a hollow core, a manually depressible key having a hollow keystem slidably supported by said housing adjacent the opposite end of said housing for endwise movement; a plunger in said housing slidably supported at one end thereof in said core and at the opposite end thereof in said keystem for endwise movement, spring means for yieldably transferring endwise movement between said keystem and said plunger, a body of magnetic material fixed in said housing, and means forming a permanent magent fixed on said plunger, said magnet being normally magnetically attracted to said body and spaced from said coil, and said spring means being effective upon a predetermined depression of said key to cause said magnet to release from said body and to approach said coil whereby to generate an electrical pulse in said coil.
2. A pulse generating device according to claim 1 comprising a member of magnetic material having relatively low magnetic retentivity attached to one end of said magnet and engagable with said body when said magnet is attracted to said body.
3. A pulse generating device according to claim 1 wherein said body is cup-shaped and has a radially inwardly extending end, a pair of members of magnetic material having relatively low magnetic retentivity attached to opposite ends of said magnet, one of said members normally engaging the radially extending end of said body, said magnet extending within said body when said magnet is attracted to said body whereby to form a substantially enclosing magnetic fluxpath for said magnet, and said magnet receding at least partially from within said body during movement toward said coil whereby the lines of magnetic force developed by said magnet will move across the windings of said coil.
4. A pulse generating device according to claim 3 comprising a core within said coil, said core comprising a magnetic material having a relatively low magnetic retentivity.
US3693033A 1971-06-24 1971-06-24 Key operated pulse generating device Expired - Lifetime US3693033A (en)

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855488A (en) * 1972-03-31 1974-12-17 Guardian Electric Mfg Co Push button pulse signal generator
US3936678A (en) * 1973-08-08 1976-02-03 Braun Aktiengesellschaft Magnetically latched piezoelectric striking igniter
US3937992A (en) * 1974-11-18 1976-02-10 Stackpole Carbon Company Pulse keyboard switch
US3984707A (en) * 1973-07-13 1976-10-05 Mcclintock Richard D Spring return linear signal generator
US4015151A (en) * 1974-05-14 1977-03-29 Braun Aktiengesellschaft Piezoelectric igniter with a striking mechanism
US4015152A (en) * 1974-08-12 1977-03-29 Braun Aktiengesellschaft Impact mechanism for piezoelectric transducers
FR2503950A1 (en) * 1981-04-10 1982-10-15 Goig Florencio Rotor for motorcycle alternator - includes ferromagnetic ring carrying permanent magnets encapsulated in plastics coating
US4903578A (en) * 1988-07-08 1990-02-27 Allied-Signal Inc. Electropneumatic rotary actuator having proportional fluid valving
US5434459A (en) * 1993-11-05 1995-07-18 Magnetic Bearing Technologies, Inc. Pulsed power linear actuator and method of increasing actuator stroke force
US5828144A (en) * 1997-01-13 1998-10-27 Keihin Corporation Electromagnetic actuator
DE19818580A1 (en) * 1998-04-25 1999-10-28 Dynamit Nobel Ag Gas generator to create rapid electrical energy pulse to ignite gas burner
WO2002095908A1 (en) * 2001-05-22 2002-11-28 Enocean Gmbh Inductive voltage generator
DE10315764A1 (en) * 2003-04-07 2004-10-28 Enocean Gmbh Electromagnetic transducer for converting energy for powering radio-controlled switch circuitry, has magnetic circuit which is opened or closed by movement of moving member from rest position
DE10315765A1 (en) * 2003-04-07 2004-11-04 Enocean Gmbh Electromagnetic energy converter
WO2011117031A1 (en) 2010-03-23 2011-09-29 Zf Friedrichshafen Ag Induction generator
DE102010003151A1 (en) 2010-03-23 2011-09-29 Zf Friedrichshafen Ag induction generator
DE102010028623A1 (en) 2010-05-05 2011-11-10 Zf Friedrichshafen Ag Induction generator for radio switch, has mechanical energy storage storing mechanical energy that is transferred from intermediate position into resting position for magnetic element
DE102010028622A1 (en) 2010-05-05 2011-11-10 Zf Friedrichshafen Ag Induction generator for radio switch, has magnet element arranged, such that element is moved linearly on generator in defined manner between contact positions in direction in which side pieces are arranged adjacent to one another

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065366A (en) * 1958-07-02 1962-11-20 Ibm Pulse generator
US3116428A (en) * 1961-10-16 1963-12-31 Space Equipment Corp Force responsive electrical impulse generator
US3132268A (en) * 1962-03-05 1964-05-05 Force Controls Company Motion e.m.f. generating transducer
US3153735A (en) * 1959-12-14 1964-10-20 Edward F Branagan Inertia electro-magnetic generator
US3398302A (en) * 1964-10-13 1968-08-20 Essex Wire Corp Electrical impulse generator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065366A (en) * 1958-07-02 1962-11-20 Ibm Pulse generator
US3153735A (en) * 1959-12-14 1964-10-20 Edward F Branagan Inertia electro-magnetic generator
US3116428A (en) * 1961-10-16 1963-12-31 Space Equipment Corp Force responsive electrical impulse generator
US3132268A (en) * 1962-03-05 1964-05-05 Force Controls Company Motion e.m.f. generating transducer
US3398302A (en) * 1964-10-13 1968-08-20 Essex Wire Corp Electrical impulse generator

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855488A (en) * 1972-03-31 1974-12-17 Guardian Electric Mfg Co Push button pulse signal generator
US3984707A (en) * 1973-07-13 1976-10-05 Mcclintock Richard D Spring return linear signal generator
US3936678A (en) * 1973-08-08 1976-02-03 Braun Aktiengesellschaft Magnetically latched piezoelectric striking igniter
US4015151A (en) * 1974-05-14 1977-03-29 Braun Aktiengesellschaft Piezoelectric igniter with a striking mechanism
US4015152A (en) * 1974-08-12 1977-03-29 Braun Aktiengesellschaft Impact mechanism for piezoelectric transducers
US3937992A (en) * 1974-11-18 1976-02-10 Stackpole Carbon Company Pulse keyboard switch
FR2503950A1 (en) * 1981-04-10 1982-10-15 Goig Florencio Rotor for motorcycle alternator - includes ferromagnetic ring carrying permanent magnets encapsulated in plastics coating
US4903578A (en) * 1988-07-08 1990-02-27 Allied-Signal Inc. Electropneumatic rotary actuator having proportional fluid valving
US5434459A (en) * 1993-11-05 1995-07-18 Magnetic Bearing Technologies, Inc. Pulsed power linear actuator and method of increasing actuator stroke force
US5828144A (en) * 1997-01-13 1998-10-27 Keihin Corporation Electromagnetic actuator
DE19818580A1 (en) * 1998-04-25 1999-10-28 Dynamit Nobel Ag Gas generator to create rapid electrical energy pulse to ignite gas burner
WO1999056382A1 (en) * 1998-04-25 1999-11-04 Dynamit Nobel Gmbh Explosivstoff- Und Systemtechnik Generator for generating transient impulses of electrical energy
WO2002095908A1 (en) * 2001-05-22 2002-11-28 Enocean Gmbh Inductive voltage generator
DE10125059A1 (en) * 2001-05-22 2002-12-12 Enocean Gmbh Inductive voltage generator
DE10125059C5 (en) * 2001-05-22 2016-07-21 Enocean Gmbh Inductive voltage generator
DE10125059B4 (en) * 2001-05-22 2006-11-09 Enocean Gmbh Inductive voltage generator
US20050035600A1 (en) * 2001-05-22 2005-02-17 Andre Albsmeier Inductive voltage generator
DE10315764A1 (en) * 2003-04-07 2004-10-28 Enocean Gmbh Electromagnetic transducer for converting energy for powering radio-controlled switch circuitry, has magnetic circuit which is opened or closed by movement of moving member from rest position
US20060087392A1 (en) * 2003-04-07 2006-04-27 Enocean Gmbh Electromagnetic energy converter
DE10315765A1 (en) * 2003-04-07 2004-11-04 Enocean Gmbh Electromagnetic energy converter
DE10315764B4 (en) * 2003-04-07 2006-11-16 Enocean Gmbh Electromagnetic energy converter for miniaturized radio switch
DE10315765B4 (en) * 2003-04-07 2006-12-07 Enocean Gmbh Electromagnetic energy converter
US7391135B2 (en) 2003-04-07 2008-06-24 Enocean Gmbh Electromagnetic energy converter
US20080265693A1 (en) * 2003-04-07 2008-10-30 Enocean Gmbh Electromagnetic energy converter
US7710227B2 (en) 2003-04-07 2010-05-04 Enocean Gmbh Electromagnetic energy transducer
US20100194213A1 (en) * 2003-04-07 2010-08-05 Frank Schmidt Electromagnetic Energy Transducer
US7786887B2 (en) 2003-04-07 2010-08-31 Enocean Gmbh Electromagnetic energy converter
US8704625B2 (en) 2003-04-07 2014-04-22 Enocean Gmbh Electromagnetic energy transducer
US20060091984A1 (en) * 2003-04-07 2006-05-04 Enocean Gmbh Electromagnetic energy transducer
US8228151B2 (en) 2003-04-07 2012-07-24 Enocean Gmbh Electromagnetic energy transducer
US9484786B2 (en) 2010-03-23 2016-11-01 Zf Friedrichshafen Ag Induction generator
WO2011117022A2 (en) 2010-03-23 2011-09-29 Zf Friedrichshafen Ag Induction generator
DE102010003151A1 (en) 2010-03-23 2011-09-29 Zf Friedrichshafen Ag induction generator
US9013084B2 (en) 2010-03-23 2015-04-21 Zf Friedrichshafen Ag Induction generator
WO2011117031A1 (en) 2010-03-23 2011-09-29 Zf Friedrichshafen Ag Induction generator
DE102010028622A1 (en) 2010-05-05 2011-11-10 Zf Friedrichshafen Ag Induction generator for radio switch, has magnet element arranged, such that element is moved linearly on generator in defined manner between contact positions in direction in which side pieces are arranged adjacent to one another
DE102010028623A1 (en) 2010-05-05 2011-11-10 Zf Friedrichshafen Ag Induction generator for radio switch, has mechanical energy storage storing mechanical energy that is transferred from intermediate position into resting position for magnetic element

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