US3830991A - Pressure sensitive mat switch construction - Google Patents

Pressure sensitive mat switch construction Download PDF

Info

Publication number
US3830991A
US3830991A US00382138A US38213873A US3830991A US 3830991 A US3830991 A US 3830991A US 00382138 A US00382138 A US 00382138A US 38213873 A US38213873 A US 38213873A US 3830991 A US3830991 A US 3830991A
Authority
US
United States
Prior art keywords
conductors
conductive
assembly according
bridging
compressive force
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
US00382138A
Other languages
English (en)
Inventor
G Durocher
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.)
Lear Corp EEDS and Interiors
Original Assignee
Essex International Inc
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
Application filed by Essex International Inc filed Critical Essex International Inc
Priority to US00382138A priority Critical patent/US3830991A/en
Priority to CA204,301A priority patent/CA1045696A/en
Priority to DE2432844A priority patent/DE2432844A1/de
Priority to GB3051374A priority patent/GB1454805A/en
Priority to JP49084273A priority patent/JPS5042385A/ja
Application granted granted Critical
Publication of US3830991A publication Critical patent/US3830991A/en
Assigned to UNITED TECHNOLOGIES AUTOMOTIVES, INC., A CORP. OF DE reassignment UNITED TECHNOLOGIES AUTOMOTIVES, INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ESSEX GROUP, INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/14—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for operation by a part of the human body other than the hand, e.g. by foot
    • H01H3/141—Cushion or mat switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/029—Composite material comprising conducting material dispersed in an elastic support or binding material

Definitions

  • the switch assembly is enclosed within a non-conductive rubber or plastic sheath. Conductive wires connected to thetwo conductors of the switch assembly extend through the sheath for connection to a source of energy and to the actuating mechanism for the door to be operated.
  • Means are provided for limiting the compressive force to which said bridging member may be subjected.
  • Mat switches of the kind referred to conventionally are located adjacent doors leading into and out of supermarkets, airports, and other public places so as to lie in the path of pedestrians approaching such doors. As a pedestrian approaches such a door he steps upon the mat, thereby compressing the latter and closing a normally open switch con tained in the mat so as to actuate a mechanism for opening the door automatically.
  • An object of this invention is to provide a mat switch construction which overcomes the disadvantages referred to above of previously known mat switches.
  • Another object of the invention is to provide a mat switch construction which enables operation of the switch at any part of the mat under a uniform force.
  • a further object of the invention' is to provide a mat switch of the character described and in which the switch assembly incorporates means for automatically protecting the switch assembly against damage due to the application of excessive forces.
  • FIG. 1 is a plan view of a mat switch constructed in accordance with the invention with parts being broken away;
  • FIG. 2 is a sectional view taken on the line 2-2 of FIG. 1 and illustrating the switch in its open or nonconductive condition;
  • FIG. 3 is a view similar to FIG. 2, but illustrating the mat switch in its conductive condition
  • FIG. 4 is a vertical section view taken on the line 4-4 of FIG. I and illustrating the means for connecting the mat switch to a source of energy and to apparatus to be operated by the switch.
  • a switch assembly constructed in accordance with the invention comprises a flat sheet I of resiliently compressible and expansible, non-conductive material such as foamed rubber, polyurethane, or the like having a plurality of rows of spaced openings 2 extending therethrough.
  • the openings in each row are uniformly spaced apart at about 2-inch intervals and adjacent rows are spaced about one inch apart, with the openings in adjacent rows staggered.
  • Adhesively secured to the lower surface of the sheet I is a plurality of washers 3, each of which has a bore 4.
  • the washers may be formed of any suitable phenolic or other nonconductive, rigid, relatively incompressible material.
  • the washers 3 are so arranged that one washer is associated with one of the openings 2 and is so oriented with respect to its associated opening that the opening 2 and the bore 4 are coaxial.
  • the washers constitute force limiting means as will be explained more fully hereinafter.
  • the non-conductive sheet 1 On opposite sides of the non-conductive sheet 1 are flexible, electrically conductive sheets 5 and 6 which preferably comprise copper screens.
  • the screen 5 may be adhered to the sheet 1 by an adhesive 7, if desired.
  • the adhesive 7 preferably is electrically conductive, of which there are many known kinds, but if the adhesive 7 is not conductive, then such adhesive will be omitted at the openings 2.
  • the conductive screen 6 may have applied thereto a layer of adhesive 8 similar to the adhesive 7. Again, the adhesive maybe electrically conductive or non-conductive. In the latter case, the adhesive will be omitted at the openings 2.
  • a resiliently compressible and expansible switching or bridging member 9 Accommodated in each opening 2 and in the bore of the companion washer 3 is a resiliently compressible and expansible switching or bridging member 9, each of which preferably comprises a cylindrical module composed of an elastomeric, non-conductive material, such as silicone rubber, throughout which is dispersed a large quantity of electrically conductive, preferably spherical particles.
  • Each bridging member may be electrically conductive in the absence of an external compressive force or, if desired, each bridging member may be non-conductive until it is subjected to a compressive force of predetermined magnitude. In either case, any one of the bridging members is capable of establishing an electrically conductive path between the conductive screens 5 and 6.
  • the initial condition of conductivity of the bridging members 9 is determined in general by the concentration of the conductive particles and by the state of the elastomer. If the elastomer resin contains a relatively large number of particles and is molded under pressure, the bridging member may be normally conductive. If the number of particles contained in the resin is less, or if the resin is molded in the absence of pressure, the bridging member may be normally non-conductive. In this case, the application of a compressive force on the bridging member effects relative movement of the particles so that a sufficient number thereof move into engagement and establish a conductive path through the elastomer. Upon removal of the compressive force the elastomer expands, thereby enabling the engaged particles to move out of engagement and break the conductive path.
  • I member must be subjected to render it conductive depends upon several factors, such as the size and concentration of the particles, the hardness of the elastomer, and the dimensions of the bridging member. These factors are described in detail in pending application Ser. No. 857,941 filed Sept. 15, 1969, and to which reference may be had for a more detailed disclosure. Such factors also may be determined empirically.
  • the assembly may be enclosed in a molded, non-conductive sheath 10 composed of two mating halves 11 and 12 of a resiliently compressible plastisol such as polyvinylchloride.
  • the two halves of the sheath then may be secured to one another by ultrasonic welding or the like so as to provide an airand moisture-tight enclosure for the switch assembly.
  • each bridging member 9 is less than the spacing between the conductive screens 5 and 6 so as to preclude any possibility of establishing a current path between the screens.
  • the relative diameters of the openings 2, the bore 4, and the members 9 are such that clearance exists around each member 9 when the latter is in its normal, uncompressed condition.
  • FIG. 4 discloses suitable connection means comprising an annular, resiliently compressible and expansible contact member 13, similar to the bridging members 9 except for its annular configuration, in engagement with the conductor 5 and in engagement with a conductive terminal 14 which extends through the sheath 10 for connection to a mechanism 15 to be operated electrically.
  • a contact member 16 like the contact 13 engages the conductor 6 and a terminal 17 which is adapted for connection to a source of electrical energy.
  • Between the terminals 14 and 17 is an annular insulator l8. Insulating grommets 19 and 20 overlie the screens 5 and 6, respectively.
  • a rivet 21 maintains the grommets in axial alignment so as to subject the members 13 and 16 to sufficient compressive force to maintain them conductive.
  • the terminals 14 and 15 are enclosed within an insulating sheath 22.
  • the sheath-enclosed switch assembly may, be positioned on a suitable foundation adjacent a door (not shown) with the terminal 14 connected to the door actuating mechanism 15 and the terminal 17 connected to an energy source.
  • a switch assembly adapted to be actuated by pedestrians must be capable of functioning under greatly varying forces.
  • a switch should be operable by the weight of a child, as well as by the weight of a much heavier adult.
  • such a switch must be capable of accommodating an extermely high concentration of force, such as that imposed by the relatively small area of a womans shoe heel.
  • a switch assembly according to the invention is capable of functioning under the greatly differing load factors referred to inasmuch as the sheath 10, the member 7, and the bridging members 9 are all resiliently compressible and the conductors 5 and 6 are flexible.
  • the switch assembly can withstand greatly excessive compressive forces inasmuch as the washers 3 protect the bridging members 9 against excessive compression due to the incompressibility of the washers themselves.
  • an increase in the force F does not cause a corresponding increase in the compressive force applied to the adjacent bridging member 9 inasmuch as the latter cannot be compressed to a thickness less than that of the force limiting washer 3.
  • the bridging members therefore, are protected by the washers against destruction or deterioration due to excessive compression, irrespective of the force applied on the switch assembly.
  • a pressure sensitive switch assembly comprising a resilient, compressible, non-conductive member having an opening therethrough; electrical conductors spaced apart by said non-conductive member, the compressibility of said non-conductive member enabling relative movement of said conductors toward one another; bridging means accommodated in said opening and operable in response to relative movement of said conductors toward one another to establish a conductive path between said conductors; and means for limiting the compressive force to which said bridging means may be subjected irrespective of the extent to which said non-conductive member may be compressed.
  • bridging means normally is conductive and has a height less than the spacing between said conductors when said non-conductive member is in its uncompressed condition.
  • An assembly according to claim 1 including a nonconductive sheath enclosing said assembly.
  • An assembly according to claim 1 including means for connecting at least one of said conductors to a source of electrical energy.
  • said bridging member comprises an elastomer throughout which is dispersed a plurality of electrically conductive particles.
  • a pressure sensitive switch assembly comprising a pair of spaced apart sheet-like conductors; a sheetlike, non-conductive, resilient, relatively compressible and expansible member interposed between said conductors and having a plurality of spaced apart openings therethrough, the compressibility of said nonconductive member enabling relative movement of said conductors toward one another; a bridging member accommodated in each of said openings and operable in response to relative movement of said conductors toward one another to establish an electrically conductive path between said conductors; and relatively incompressible limit means interposed between said conductors adjacent each of said bridging members for limiting the extent of movement of said conductors toward one another and consequently limiting the compressive force to which said bridging members may be subjected.
  • each of said limit means comprises an annulus encircling a bridging member.
  • each of said annuli is interposed between said nonconductive member and one of said conductors.
  • An assembly according to claim 14 including a resilient, non-conductive sheath enclosing said assembly.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Push-Button Switches (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
US00382138A 1973-07-24 1973-07-24 Pressure sensitive mat switch construction Expired - Lifetime US3830991A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00382138A US3830991A (en) 1973-07-24 1973-07-24 Pressure sensitive mat switch construction
CA204,301A CA1045696A (en) 1973-07-24 1974-07-08 Pressure sensitive mat switch construction
DE2432844A DE2432844A1 (de) 1973-07-24 1974-07-09 Druckempfindliche schalteranordnung
GB3051374A GB1454805A (en) 1973-07-24 1974-07-10 Pressure sensitive switch construction
JP49084273A JPS5042385A (enrdf_load_stackoverflow) 1973-07-24 1974-07-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00382138A US3830991A (en) 1973-07-24 1973-07-24 Pressure sensitive mat switch construction

Publications (1)

Publication Number Publication Date
US3830991A true US3830991A (en) 1974-08-20

Family

ID=23507674

Family Applications (1)

Application Number Title Priority Date Filing Date
US00382138A Expired - Lifetime US3830991A (en) 1973-07-24 1973-07-24 Pressure sensitive mat switch construction

Country Status (5)

Country Link
US (1) US3830991A (enrdf_load_stackoverflow)
JP (1) JPS5042385A (enrdf_load_stackoverflow)
CA (1) CA1045696A (enrdf_load_stackoverflow)
DE (1) DE2432844A1 (enrdf_load_stackoverflow)
GB (1) GB1454805A (enrdf_load_stackoverflow)

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873795A (en) * 1973-04-28 1975-03-25 Lucas Electrical Co Ltd Electrical switch with reciprocating cam
US4137116A (en) * 1977-04-22 1979-01-30 Miller Brothers Method of making a pressure switch
US4164634A (en) * 1977-06-10 1979-08-14 Telaris Telecommunications, Inc. Keyboard switch assembly with multiple isolated electrical engagement regions
US4172216A (en) * 1978-05-19 1979-10-23 Sprague Electric Company Pressure sensitive switch
US4200777A (en) * 1977-04-22 1980-04-29 Miller Norman K Pressure switch
US4233523A (en) * 1978-01-31 1980-11-11 Lars Jarder Pressure sensitive device
US4308439A (en) * 1978-06-08 1981-12-29 Nissan Motor Company, Limited Switching device
EP0068133A3 (en) * 1981-06-12 1983-03-30 Wilhelm Ruf Kg Switch disposition with an elastic switch element
US4401896A (en) * 1981-05-26 1983-08-30 Fowler Eugene W Weight or ambient pressure-responsive mechanical pressure switch
US4439647A (en) * 1982-07-14 1984-03-27 Nick Calandrello Touchpad keyboard
FR2543764A1 (fr) * 1983-03-31 1984-10-05 Canon Kk Element d'entree tel qu'un commutateur de tableau
US4570521A (en) * 1984-03-30 1986-02-18 Jeffrey Fox Electronic musical instrument with string-simulating switches
US4617433A (en) * 1984-06-25 1986-10-14 Bridgestone Corporation Pressure-sensitive conductive strip switch assembly and a method of manufacturing the same
US4623766A (en) 1983-07-01 1986-11-18 Alps Electric Co., Ltd. Pressure-sensitive sheet material
EP0210002A1 (en) * 1985-07-04 1987-01-28 Uniroyal Limited Pressure responsive electrically conductive materials
US4701629A (en) * 1985-04-10 1987-10-20 Citroen Maxime H Switch control unit for motor vehicle
EP0293734A1 (en) * 1987-06-02 1988-12-07 LEDA Logarithmic Electrical Devices for Automation S.r.l. Two-dimensional electric conductor designed to function as an electric switch
US5239148A (en) * 1991-05-15 1993-08-24 Progressive Engineering Technologies Corp. Lane discriminating traffic counting device
US5322086A (en) * 1992-11-12 1994-06-21 Sullivan Robert A Hands-free, leg-operated, faucet-control device
US5602428A (en) * 1995-06-07 1997-02-11 Acrometal Companies, Inc. Switch mat with active threshold
US6611783B2 (en) 2000-01-07 2003-08-26 Nocwatch, Inc. Attitude indicator and activity monitoring device
US6748869B1 (en) * 1998-12-16 2004-06-15 Delegation Generale Pour L'armement Batiment La Rotonde Device for firing a primer
US20070163365A1 (en) * 2006-01-19 2007-07-19 Progressive Engineering Technologies Corp. Sensor apparatus and method
US20090236207A1 (en) * 2008-03-21 2009-09-24 Shenzhen Futaihong Precision Industry Co., Ltd. Key button structure for electronic device
US20090241621A1 (en) * 2008-03-26 2009-10-01 Shenzhen Futaihong Precision Industry Co., Ltd. Key assembly
US20150114814A1 (en) * 2013-10-30 2015-04-30 Panasonic Intellectual Property Management Co., Ltd. Pressure-sensitive switch, manufacturing method for same, touch panel including pressure-sensitive switch, and manufacturing method for touch panel
US20150116073A1 (en) * 2013-10-30 2015-04-30 Panasonic Intellectual Property Management Co., Ltd. Pressure-sensitive switch, manufacturing method for same, touch panel including pressure-sensitive switch, and manufacturing method for touch panel
US9799183B2 (en) 2013-12-06 2017-10-24 SkyBell Technologies, Inc. Doorbell package detection systems and methods
US20190267163A1 (en) * 2016-11-11 2019-08-29 Kitagawa Industries Co., Ltd. Pressure sensor
US10444094B1 (en) * 2017-07-14 2019-10-15 Flex Ltd. Bladder system for force sensitive resistors (FSR) sensors
US10466118B1 (en) 2015-08-28 2019-11-05 Multek Technologies, Ltd. Stretchable flexible durable pressure sensor
EP3528271A4 (en) * 2016-10-14 2019-12-25 Omron Corporation RESIN STRUCTURE, ELECTRONIC DEVICE, AND METHOD FOR PRODUCING RESIN STRUCTURE
US10650946B1 (en) 2018-08-08 2020-05-12 Flex Ltd. Trimming method of DCR sensing circuits
WO2020094503A1 (en) * 2018-11-07 2020-05-14 Iee International Electronics & Engineering S.A. Method for producing a foil-based pressure sensor
LU101058B1 (en) * 2018-12-14 2020-06-15 Iee Sa Method for Producing a Foil-Based Pressure Sensor
US10690559B1 (en) 2018-03-28 2020-06-23 Flex Ltd. Pressure sensor array and the method of making
US10794779B2 (en) 2016-12-20 2020-10-06 Kitagawa Industries Co., Ltd. Pressure sensor
US10993635B1 (en) 2016-03-22 2021-05-04 Flextronics Ap, Llc Integrating biosensor to compression shirt textile and interconnect method
US11022580B1 (en) 2019-01-31 2021-06-01 Flex Ltd. Low impedance structure for PCB based electrodes
US11124390B2 (en) 2018-05-22 2021-09-21 Otis Elevator Company Pressure sensitive mat
US11668686B1 (en) 2019-06-17 2023-06-06 Flex Ltd. Batteryless architecture for color detection in smart labels

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2854459A1 (de) * 1978-12-16 1980-08-28 Fraunhofer Ges Forschung Sicherheitseinrichtung fuer anlagen mit in den raum bewegten teilen
DE2901704C3 (de) * 1979-01-17 1981-10-08 Hans Dipl.-Ing. 5928 Laasphe Osterrath An einer Tür angeordneter Elektroschalter
US4373122A (en) * 1981-01-26 1983-02-08 W. H. Brady Co. Capacitance switch
US4373124A (en) * 1981-01-26 1983-02-08 W. H. Brady Co. Capacitance switch
US4367385A (en) * 1981-01-26 1983-01-04 W. H. Brady Co. Capacitance switch
GB8314801D0 (en) * 1983-05-27 1983-07-06 Minnesota Mining & Mfg Electrical switch
DE3507922A1 (de) * 1985-03-06 1986-09-11 Mayser-Gmbh & Co, 7900 Ulm Schaltmatte und verfahren zu ihrer herstellung
GB2261115A (en) * 1991-10-29 1993-05-05 Eja Eng Plc Pressure sensitive mat
US5695859A (en) * 1995-04-27 1997-12-09 Burgess; Lester E. Pressure activated switching device
GB2304458B (en) * 1995-08-19 1999-02-24 Rover Group A detection system
GB2320347A (en) * 1996-12-04 1998-06-17 Hodgkinson & Corby Limited Inflatable cellular support cushion or mattress detector
GB2326283B (en) * 1997-06-13 1999-05-05 Brite Power International Limi Pressure pad,switch and alarm apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1775755A (en) * 1928-11-26 1930-09-16 Nat Pneumatic Co Treadle switch structure
US2625621A (en) * 1950-02-11 1953-01-13 Stanley Works Electric mat switch
US3648002A (en) * 1970-05-04 1972-03-07 Essex International Inc Current control apparatus and methods of manufacture

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044080A (en) * 1935-07-31 1936-06-16 Charles R Kemper Circuit controlling device
JPS429734Y1 (enrdf_load_stackoverflow) * 1965-01-27 1967-05-26
JPS441744Y1 (enrdf_load_stackoverflow) * 1966-06-07 1969-01-23

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1775755A (en) * 1928-11-26 1930-09-16 Nat Pneumatic Co Treadle switch structure
US2625621A (en) * 1950-02-11 1953-01-13 Stanley Works Electric mat switch
US3648002A (en) * 1970-05-04 1972-03-07 Essex International Inc Current control apparatus and methods of manufacture

Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873795A (en) * 1973-04-28 1975-03-25 Lucas Electrical Co Ltd Electrical switch with reciprocating cam
US4137116A (en) * 1977-04-22 1979-01-30 Miller Brothers Method of making a pressure switch
US4200777A (en) * 1977-04-22 1980-04-29 Miller Norman K Pressure switch
US4164634A (en) * 1977-06-10 1979-08-14 Telaris Telecommunications, Inc. Keyboard switch assembly with multiple isolated electrical engagement regions
US4233523A (en) * 1978-01-31 1980-11-11 Lars Jarder Pressure sensitive device
US4172216A (en) * 1978-05-19 1979-10-23 Sprague Electric Company Pressure sensitive switch
US4308439A (en) * 1978-06-08 1981-12-29 Nissan Motor Company, Limited Switching device
US4401896A (en) * 1981-05-26 1983-08-30 Fowler Eugene W Weight or ambient pressure-responsive mechanical pressure switch
EP0068133A3 (en) * 1981-06-12 1983-03-30 Wilhelm Ruf Kg Switch disposition with an elastic switch element
US4439647A (en) * 1982-07-14 1984-03-27 Nick Calandrello Touchpad keyboard
FR2543764A1 (fr) * 1983-03-31 1984-10-05 Canon Kk Element d'entree tel qu'un commutateur de tableau
US4623766A (en) 1983-07-01 1986-11-18 Alps Electric Co., Ltd. Pressure-sensitive sheet material
US4570521A (en) * 1984-03-30 1986-02-18 Jeffrey Fox Electronic musical instrument with string-simulating switches
US4617433A (en) * 1984-06-25 1986-10-14 Bridgestone Corporation Pressure-sensitive conductive strip switch assembly and a method of manufacturing the same
US4701629A (en) * 1985-04-10 1987-10-20 Citroen Maxime H Switch control unit for motor vehicle
EP0210002A1 (en) * 1985-07-04 1987-01-28 Uniroyal Limited Pressure responsive electrically conductive materials
EP0293734A1 (en) * 1987-06-02 1988-12-07 LEDA Logarithmic Electrical Devices for Automation S.r.l. Two-dimensional electric conductor designed to function as an electric switch
US4876419A (en) * 1987-06-02 1989-10-24 Leda Logarithmic Electrical Devices For Automation S.R.L. Two-dimensional electric conductor designed to function as an electric switch
US5239148A (en) * 1991-05-15 1993-08-24 Progressive Engineering Technologies Corp. Lane discriminating traffic counting device
US5360953A (en) * 1991-05-15 1994-11-01 Progressive Engineering Technologies Corp. Lane discriminating traffic counting device
US5322086A (en) * 1992-11-12 1994-06-21 Sullivan Robert A Hands-free, leg-operated, faucet-control device
US5602428A (en) * 1995-06-07 1997-02-11 Acrometal Companies, Inc. Switch mat with active threshold
US6748869B1 (en) * 1998-12-16 2004-06-15 Delegation Generale Pour L'armement Batiment La Rotonde Device for firing a primer
US6611783B2 (en) 2000-01-07 2003-08-26 Nocwatch, Inc. Attitude indicator and activity monitoring device
US20070163365A1 (en) * 2006-01-19 2007-07-19 Progressive Engineering Technologies Corp. Sensor apparatus and method
US7460027B2 (en) * 2006-01-19 2008-12-02 Progressive Engineering Technologies Corp. Sensor cord array and method with conductive sensors for detecting activity on or around an object
US20090236207A1 (en) * 2008-03-21 2009-09-24 Shenzhen Futaihong Precision Industry Co., Ltd. Key button structure for electronic device
US8008591B2 (en) * 2008-03-21 2011-08-30 Shenzhen Futaihong Precision Industry Co., Ltd. Key button structure for electronic device
US20090241621A1 (en) * 2008-03-26 2009-10-01 Shenzhen Futaihong Precision Industry Co., Ltd. Key assembly
US20150114814A1 (en) * 2013-10-30 2015-04-30 Panasonic Intellectual Property Management Co., Ltd. Pressure-sensitive switch, manufacturing method for same, touch panel including pressure-sensitive switch, and manufacturing method for touch panel
CN104599878A (zh) * 2013-10-30 2015-05-06 松下电器产业株式会社 压敏开关及具备压敏开关的触控面板、和它们的制造方法
CN104598066A (zh) * 2013-10-30 2015-05-06 松下电器产业株式会社 压敏开关及具备压敏开关的触控面板、和它们的制造方法
US9509303B2 (en) * 2013-10-30 2016-11-29 Panasonic Intellectual Property Management Co., Ltd. Pressure-sensitive switch, manufacturing method for same, touch panel including pressure-sensitive switch, and manufacturing method for touch panel
US9508504B2 (en) * 2013-10-30 2016-11-29 Panasonic Intellectual Property Management Co., Ltd. Pressure-sensitive switch, manufacturing method for same, touch panel including pressure-sensitive switch, and manufacturing method for touch panel
US20150116073A1 (en) * 2013-10-30 2015-04-30 Panasonic Intellectual Property Management Co., Ltd. Pressure-sensitive switch, manufacturing method for same, touch panel including pressure-sensitive switch, and manufacturing method for touch panel
US9799183B2 (en) 2013-12-06 2017-10-24 SkyBell Technologies, Inc. Doorbell package detection systems and methods
US10466118B1 (en) 2015-08-28 2019-11-05 Multek Technologies, Ltd. Stretchable flexible durable pressure sensor
US10993635B1 (en) 2016-03-22 2021-05-04 Flextronics Ap, Llc Integrating biosensor to compression shirt textile and interconnect method
EP3528271A4 (en) * 2016-10-14 2019-12-25 Omron Corporation RESIN STRUCTURE, ELECTRONIC DEVICE, AND METHOD FOR PRODUCING RESIN STRUCTURE
US10734170B2 (en) 2016-10-14 2020-08-04 Omron Corporation Resin structure, electronic device, and method of manufacturing resin structure
US10629337B2 (en) * 2016-11-11 2020-04-21 Kitagawa Industries Co., Ltd. Pressure sensor
US20190267163A1 (en) * 2016-11-11 2019-08-29 Kitagawa Industries Co., Ltd. Pressure sensor
US10794779B2 (en) 2016-12-20 2020-10-06 Kitagawa Industries Co., Ltd. Pressure sensor
US10444094B1 (en) * 2017-07-14 2019-10-15 Flex Ltd. Bladder system for force sensitive resistors (FSR) sensors
US10690559B1 (en) 2018-03-28 2020-06-23 Flex Ltd. Pressure sensor array and the method of making
US11124390B2 (en) 2018-05-22 2021-09-21 Otis Elevator Company Pressure sensitive mat
US10650946B1 (en) 2018-08-08 2020-05-12 Flex Ltd. Trimming method of DCR sensing circuits
WO2020094503A1 (en) * 2018-11-07 2020-05-14 Iee International Electronics & Engineering S.A. Method for producing a foil-based pressure sensor
LU101058B1 (en) * 2018-12-14 2020-06-15 Iee Sa Method for Producing a Foil-Based Pressure Sensor
US11022580B1 (en) 2019-01-31 2021-06-01 Flex Ltd. Low impedance structure for PCB based electrodes
US11668686B1 (en) 2019-06-17 2023-06-06 Flex Ltd. Batteryless architecture for color detection in smart labels

Also Published As

Publication number Publication date
CA1045696A (en) 1979-01-02
JPS5042385A (enrdf_load_stackoverflow) 1975-04-17
GB1454805A (en) 1976-11-03
DE2432844A1 (de) 1975-02-13

Similar Documents

Publication Publication Date Title
US3830991A (en) Pressure sensitive mat switch construction
US3879586A (en) Tactile keyboard switch assembly with metallic or elastomeric type conductive contacts on diaphragm support
RU1808142C (ru) Плоскостной электрический проводник
US3710209A (en) Variable capacitor
US4343973A (en) Low cost electrical switch
CA1289176C (en) High sensitivity mat switch
US3862381A (en) Keyboard switch assembly with multilayer, coextensive contactor means
US3773998A (en) Pedestal and spring member for key actuator of diaphragm switch
CA1317334C (en) Electrical switch having a snap-acting switch element
US3099774A (en) Static discharge device
US4524249A (en) Keyboard switch assembly
US3209089A (en) Miniature casing pressure operated switch with resilient contact spacer and short circuit prevention structure
US4515999A (en) Full travel keyboard
US3694600A (en) Cushion switch means
US4524256A (en) Pressure-sensitive element
JPH04332414A (ja) 常閉圧力作動スイッチ
EP0109159B1 (en) Pressure sensitive switchmats
US3553404A (en) Normally closed pressure switch
USRE28595E (en) Current control apparatus and methods of manufacture
US3732390A (en) Keyswitch
US3825277A (en) Mat switch
JPH07141958A (ja) 感圧スイッチ
GB2261115A (en) Pressure sensitive mat
GB2102626A (en) Contact dimple pad
EP0127454B1 (en) Pressure-sensitive electrical switchmat and electrical switch for use therein

Legal Events

Date Code Title Description
AS Assignment

Owner name: UNITED TECHNOLOGIES AUTOMOTIVES, INC., A CORP. OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ESSEX GROUP, INC.;REEL/FRAME:004933/0578

Effective date: 19880223