EP0391263A1 - An electrostatic shock-preventing key device - Google Patents

An electrostatic shock-preventing key device Download PDF

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Publication number
EP0391263A1
EP0391263A1 EP90106073A EP90106073A EP0391263A1 EP 0391263 A1 EP0391263 A1 EP 0391263A1 EP 90106073 A EP90106073 A EP 90106073A EP 90106073 A EP90106073 A EP 90106073A EP 0391263 A1 EP0391263 A1 EP 0391263A1
Authority
EP
European Patent Office
Prior art keywords
key
conductive
case
sliding plate
grip portion
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.)
Ceased
Application number
EP90106073A
Other languages
German (de)
English (en)
French (fr)
Inventor
Motohiro Gotanda
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0391263A1 publication Critical patent/EP0391263A1/en
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/02—Carrying-off electrostatic charges by means of earthing connections

Definitions

  • the present invention relates to an electrostatic shock preventing key device whereof a key's body made of a conductive material is accommodated in a case made of an insulating material and can be pushed out of the case only its by inserted portion at the time of locking and unlocking and the case which is provided with a resistor for preventing a static shock due to the discharge of static electricity accumulated on the user's body.
  • the present applicant has previously proposed an electrostatic shock-preventing key device.
  • This prior art is described in the Japanese laid open patent publication No.JPU 63-136172.
  • the key previously proposed by the present applicant is such that:the key's body is made of a conductive material and consists of an inserted portion and a grip portion; a sliding plate has a protrusion for engaging thereon the key's grip and a protrusion for sliding the key's body; a case made of an insulating material has a compartment for slidably putting therein a sliding plate and a cover; the case is provided with an electricity conductor placed on at least one surface, a resistor is connected to said conductor and also to the slide, a contact piece is in contact with the grip of the key's body when the inserting portion of the key's body is projected from the case by means of the sliding plate, and a leaf spring is provided for keeping the inserted portion of the key's body in its projected position.
  • an electrostatic shock preventing key previously proposed by the present applicant has such a drawback that the set positions of the contact piece and the leaf spring must be changed if the size and form of the key grip portion are changed. Furthermore, if the key grip is made with sharp corners, the contact piece and the leaf spring are subjected to the damaging of their surfaces by the sharp corners of the key's grip each time the key is slid out of the key's body, causing the contact piece and the spring to lose their resiliency thereby unable to keep the key's body in the necessary position and the key's grip cannot enter into contact with the contact piece, i.e. the key becomes unable to discharge the static electricity.
  • the present invention has been made in view of the above-described drawbacks of the prior art and has as its purpose to provide an electrostatic shock-preventing key wherein only an inserted portion of the key's body can be slid in and out of a case without lessening the ability of the key's body to be in the necessary position and also thereby not losing its ability to discharge static electricity.
  • the electrostatic shock preventing key includes a key made of a conductive material and composed of an inserted portion and a grip portion; a sliding plate provided with a protrusion for mounting thereon the key's grip portion and for externally sliding in the key's body; a case made of insulating material and having a compartment for slidably accommodating the sliding plate and a cover for covering said compartment; and a conductive portion including a contact piece being in contact with the key's grip portion which is bonded to the sliding plate, a compression-spring abutting onto said contact piece, a ball constantly being urged downward by said compression-spring, a slender conductive piece whereon said ball travels and being urged downward by the compression-spring, a resistor connected at one end to said conductive piece, and a conductive plate connected to the other end of said resistor and mounted onto the outer surface of the case.
  • the device according to the present invention is constructed so as to project only the inserted portion of the key from the receiving compartment of the case by externally sliding the sliding plate when the key has to be used.
  • static electricity on the person's body flows naturally through the resistor of the key's device and therefore is slowly discharged without giving the person a shock.
  • an electrostatic shock preventing key device comprises a key body made of a conductive material and composed of an inserted portion and a grip portion; a sliding plate provided with a protrusion for mounting thereon the key's grip portion and for externally sliding the key's body; a case made of an insulating material and composed of a compartment for slidably accommodating the sliding plate and a cover for covering said compartment; and a conductive portion including a contact piece that is in contact with the key grip portion which is bonded to the sliding plate, a compression-spring abutting onto said contact piece, a ball constantly being urged downward by said compression-spring, a slender conductive piece whereon said ball travels and being urged downward by the compression-spring, a resistor connected at one end to said conductive piece, and a conductive plate connected to the other end of said resistor and mounted onto the outer surface of the case, the inserted portion of the key's body being able to be completely retracted into the case while the key is not being
  • the whole device can be made smaller and easier to carry.
  • the device according to the present invention requires no readjustment of the key's grip position. Furthermore, since the present device has no portion being subjected to wear during the movement of the key inside the case, the device may be improved remarkably in its practical use and quality.
  • Fig.1A and 1B show a conventional electrostatic shock-preventing key device.
  • Fig.1A is a front view and Fig.1B is a sectional view along line IB-IB of Fig.1A.
  • numeral 51 designates a complete set of the conventional electrostatic shock-preventing key device.
  • a key body 2 made of a conductive material is composed of an inserted portion 3 and a grip portion 4.
  • a sliding plate 52 has an engaged protrusion 53 for mounting thereon the grip portion 4 of the key's body 2 and a protrusion 54 for sliding the key's body 2.
  • a case 55 made of an insulating material is composed of a compartment 56, in which a sliding plate 52 is slidably accommodated, and a cover 57 for covering the compartment 56.
  • the case 55 is provided with a conductor 58 mounted on at least one surface of the case, a resistor 59 connected with the conductor 58, a contact piece 60 which comes into contact with the grip portion 4 of the key's body 2 when the inserted portion 3 of the key's body 2 is projected from the case 55 by sliding the sliding plate 52 connected with the resistor 59, and a leaf spring 61 for retaining the inserted portion 3 of the key's body 2 in the projected position.
  • the contact piece 60 and the leaf spring 61 are subjected to the damaging of their surfaces by the sharp corners of the key's grip portion 4 each time the key is slid out of the key's body 2, causing the contact piece 60 and the spring to lose their resiliency and thereby unable to keep the key's body 2 in the necessary position and the key's grip portion 4 cannot enter into contact with the contact piece 60, i.e. the key becomes unable to discharge the static electricity.
  • Fig.2A - 2E show an embodiment of the present invention.
  • Numeral 1 designates a complete an electrostatic shock-preventing key device.
  • a key's body 2 is made of a conductive material and is composed of an inserted portion 3, a grip portion 4 and a through-hole 5.
  • a slide plate 11 for mounting the key's body 2 thereon is made of an insulating material such as a synthetic resin etc.
  • Figs.3A and 3B are respectively plan and side views showing the sliding plate 2 which has a recessed portion 12 for mounting thereon the grip portion 4 of the key's body 2, a protrusion 13 for engaging the through-hole 5 of the key's body 2, a protrusion 14 for engaging thereon the grip portion 4 of the key's body 2, a protrusion 15 for sliding the sliding plate 11 and a slot 16.
  • a case 21, in which the slide 11 is slidably accommodated is made of an insulating material such as a synthetic resin or the like and and has a compartment 22 for accommodating the sliding plate 11, a slotted hole 23 made on the rear surface of the case 21, an opening 24 through which the inserted portion 3 of the key's body 2 moves in and out of the case, a through-hole 25 and tapped-holes 26.
  • Fig.4 is a construction view showing the conducting portion of electrostatic shock-preventing key 1.
  • numeral 31 is the whole conducting portion
  • 32 is a contact piece being in contact with the grip portion 4 of the key's body 2
  • 33 is a compression spring abutting on said contact piece 32
  • 34 is a ball constantly being urged downward by said compression spring 33
  • 35 is a slender conductive piece whereon said ball 34 travels being urged downward by the compression-spring 33
  • 35a and 35b are recessed portion's for engaging the ball 34 therein
  • 36 is a resistor which is connected at its one end to the conducting piece 35 so as to slowly discharge the static electricity and has a high resistance of, for example, several mega-ohms selected so as not to give a shock to the human body.
  • a cover 41 for covering the receiving compartment 22 is made of a metal sheet so as to increase the strength of the key device 1 and has the configuration shown in Fig.
  • the cover 41 has through-holes 42 made in the respective positions corresponding to the positions of the tapped-holes 26 on the case 21 for threadably securing the cover 41 to the case 21, and it also has a notch made therein so as not to interfere with the resistor 36 and the coil spring 37 shown in Fig.2B.
  • a name plate 44 made of synthetic resin covers the whole top surface of the cover 41.
  • Fig.6 is a plan view showing an electrostatic shock-preventing key device 1 being accommodated in the case 21.
  • the inserted potion 3 of the key's body 2 can be retracted into the case 21 by sliding the protrusion 15 in a direction opposite to the direction shown by an arrow A.
  • the electrostatic shock-preventing key device comprises: a key's body made of a conductive material and composed of an inserted portion and a grip portion; a sliding plate provided with a protrusion for mounting thereon the key's grip portion and for externally sliding the key's body; a case made of an insulating material and composed of a compartment for slidably accommodating the sliding plate and a cover for covering said compartment; and a conductive portion including a contact piece that is in contact with the key's grip portion which is bonded to the sliding plate, a compression-spring abutting onto said contact piece, a ball constantly being urged downward by said compression-spring, a slender conductive piece whereon said ball travels and being urged downward by the compression-spring, a resistor connected at one end to said conductive piece, and a conductive plate connected to the other end of said resistor and mounted onto the outer surface of the case, it is possible to completely retract the inserted portion of the key's body into case
  • the device according to the present invention requires no readjustment of the key grip's position. Furthermore, the device has no portion wearing due to friction at the time of sliding the key grip in and out of the case and therefore may be remarkably improved in its quality.

Landscapes

  • Elimination Of Static Electricity (AREA)
  • Supports Or Holders For Household Use (AREA)
EP90106073A 1989-04-07 1990-03-29 An electrostatic shock-preventing key device Ceased EP0391263A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1989040536U JPH0732793Y2 (ja) 1989-04-07 1989-04-07 静電ショック防止キー
JP40536/89U 1989-04-07

Publications (1)

Publication Number Publication Date
EP0391263A1 true EP0391263A1 (en) 1990-10-10

Family

ID=12583177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90106073A Ceased EP0391263A1 (en) 1989-04-07 1990-03-29 An electrostatic shock-preventing key device

Country Status (2)

Country Link
EP (1) EP0391263A1 (ja)
JP (1) JPH0732793Y2 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994001305A1 (en) * 1992-07-07 1994-01-20 C.V.G. - Centro Veneto Galvanico - S.R.L. Method and a device for preventing flashovers
CN106382057A (zh) * 2016-10-24 2017-02-08 珠海优特电力科技股份有限公司 一种电控钥匙和磁控锁以及开锁方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2611372A1 (fr) * 1987-02-28 1988-09-02 Gotanda Motohiro Structure de cle antistatique

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2611372A1 (fr) * 1987-02-28 1988-09-02 Gotanda Motohiro Structure de cle antistatique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994001305A1 (en) * 1992-07-07 1994-01-20 C.V.G. - Centro Veneto Galvanico - S.R.L. Method and a device for preventing flashovers
CN106382057A (zh) * 2016-10-24 2017-02-08 珠海优特电力科技股份有限公司 一种电控钥匙和磁控锁以及开锁方法
CN106382057B (zh) * 2016-10-24 2018-10-19 珠海优特物联科技有限公司 一种电控钥匙和磁控锁以及开锁方法

Also Published As

Publication number Publication date
JPH0732793Y2 (ja) 1995-07-31
JPH02130965U (ja) 1990-10-30

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