CA1327624C - Tv cut-out - Google Patents
Tv cut-outInfo
- Publication number
- CA1327624C CA1327624C CA 545683 CA545683A CA1327624C CA 1327624 C CA1327624 C CA 1327624C CA 545683 CA545683 CA 545683 CA 545683 A CA545683 A CA 545683A CA 1327624 C CA1327624 C CA 1327624C
- Authority
- CA
- Canada
- Prior art keywords
- card
- casing
- switch
- contact
- slot
- 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 - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
Landscapes
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A simple switch device for use with an electrical home appliance such as a television set to prevent unauthorized use of the appliance, e.g. by a child includes a casing with a narrow slot therein for receiving a card, which closes a pair of contacts to close a switch, thus completing a circuit between the appliance and a source of electrical power. The contacts can be normal metal contacts and the switch a female plug for receiving the male plug on the free end of a television cord or cable. The contacts can also be integral with the switch, both elements being in-corporated in a push-button switch or a microswitch. A relay can also be provided between the contacts and the male plug for acting as a switch, which must be closed before a circuit is completed between the appliance and the male plug.
A simple switch device for use with an electrical home appliance such as a television set to prevent unauthorized use of the appliance, e.g. by a child includes a casing with a narrow slot therein for receiving a card, which closes a pair of contacts to close a switch, thus completing a circuit between the appliance and a source of electrical power. The contacts can be normal metal contacts and the switch a female plug for receiving the male plug on the free end of a television cord or cable. The contacts can also be integral with the switch, both elements being in-corporated in a push-button switch or a microswitch. A relay can also be provided between the contacts and the male plug for acting as a switch, which must be closed before a circuit is completed between the appliance and the male plug.
Description
~ 1327624 This invention relates to a switch device, and in particular to a safety switch device for use with electrical home appliances.
In general, electrical appliances for use in the home are not particularly dangerous. However, there is the distinct risk that a child will turn on an appliance and leave the appliance in operation. Accordingly, a need exists for a switch device which can be used to prevent operation of an electrical appliance merely by flicking a switch or pulling a button. Such need extends to appliances such as television sets, which are often in use without parental consent.
The patent literature contains a variety of switch devices of generally the same type as described herein. Such switch devices are described for example in United States Patents Nos. ~,844,675, which issued to V.R. Edgar on July 22, 1958 and 4,092,506, which issued to C.C. Saulters on May 30, 1978. However, -the patented devices are ill adapted to use in the home, and could themselves prove to be susceptible to tampering by a child.
An object of the present invention is to meet the need mentioned above by providing a relatively simple safety switch device, which is economical in terms of manufacturing costs, and which is virtually childproof.
Another object of the invention is to provide a safety switch device which can be operated either by means of a simple non-conductive card, thus preventing dangerous tampering """.
- 1 - ~
~ 327624 with metal objects, or by means of a conductive portion of a non-conductive card with additional or auxiliary safety means built into the device Accordingly, the present invention relates to a safety switch device comprising casing means; slot means in said casing means for receiving planar card means; first contact means in said casing means for connection to a source of electrical power;
second contact means in said casing means for connection to an electrical appliance; and switch means in said casing means for actuation by said card means to complete an electrically conductive :
path between said first and second contact means.
The invention will be descri~ed in greater detail with reference to the accompanying drawings, which illustrate preferred embodiments of the invention, and wherein:
Figure 1 is a mainly sectioned, schematic, front view of a switch device in accordance with the invention;
Figure 2 is a mainly sectioned, perspective view of the device of Fig. 1 from one side and the front; ``
Figure 3 is a rear perspective view of the device of Figs. 1 and 2;
Figure 4 is a cross-sectional view of a second embodiment of the switch device of the present invention;
Figure 5 is a cross section taken generally along line V-V of Fig. 4;
Figure 6 is a perspective view of a card for use in the ~
device of Figs. 4 and 5; `
Figure 7 is a perspective view of the core of a third embodiment of the switch device of the present invention;
Figure 8 is a schematic, longitudinal sectional view of the device of Fig. 7;
Figure 9 is a perspective view of a card for use in the device of Figs. 7 and 8;
Figure 10 is a perspective view of the core of a fourth embodiment of the switch device in accordance with the present invention;
Figure 11 is a schem~tic, longitudinal sectional view of the device of Fig. 10; and Figure 12 is a perspective view of a card for use in the device of Figs. 10 and 11.
It will be appreciated that wherever po~sible the same lS reference numerals have been used to identify the same or similar elements in the drawings. Moreover, for the sake of simplicity elements and some structural details have been omitted from the drawings.
With reference to Figs. 1 to 3, one form of the switch in accordance with the invention includes a rectangular casing generally indicated at 1 defined by a top wall 2, a bottom wall 3, a front wall 4, a rear wall 5, and end walls 6 and 7. A slot 9 ..
is provided in the top wa.ll 2 for receiving acard 10 (Fig. 3) .:
which is described hereinafter in greater detail. Partitions 12 .
and 13 divide the interior of the casing 1 into a card receiving l 321624 chamber 14, a contact chamber 15 and a switch chamber 16 (Fig. 1).
The card receiving chamber 14 occupies the top central portion of the interior of the casing 1, and includes a slot 18 in each side 19 of the generally U-shaped partition 12 for receiving a disc-shaped lever 20 or 21. Each lever 20 and 21 is -pivotally mounted in the contact chamber 15 of the casing 1 by means of a pin 22. A pair of arms 23 and 24 extend generally upwardly and downwardly, respectively from each lever 20 and 21.
Helical springs 26 connected to the arms 23 and to the casing 1 bias the levers 20 and 21 for rotation around the pins 22 to move the arms 24 toward or away from electrical contacts defined by conductive metal strips 27, 28 and 29.
The strip 27 is mounted in the casing 1, and defines a fixed contact extending between the two levers 20 and 21. Strips 28 and 29 are movable contacts in that they are sufficiently resilient that they can be moved toward or away from the fixed contact (strip 27) and return to their rest positions. The lever 20 no~màlly biases the strip 28 into contact with the strip 27, and the lever 21 does not normally contact the strip 29, thus ~0 permitting the two strips 27 and 28 to remain spaced apart or open.
The bottom end of the strips 28 and 29 are connected to electrical leads 31 and 32 respectively. The lead 31 is connected to one terminal (not shown) of a switch defined by a grounded female receptacle 34 mounted in the switch chamber 16.
The receptacle 34 is intended to receive a male plug (not shown) from an electrical appliance such as a television set (not shown).
The male plug is introduced into the chamber 16 through an opening 35, which is normally closed by a door 36. A V-shaped notch 38 is provided in the end wall 6 for receiving the cable or lead (not shown) carrying the male plug.
The lead 32 is connected to a grounded male plug 40 for plugging into a wall receptacle (not shown) or other female receptacle which is connected to a source of electrical power.
The male plug 40 is also connected to the receptacle 34 by leads 41.
The operation o the above described device will be described with reference to Figs. 1 and 3. As shown in Fig. 3, the card 10 is generally rectangular with wings or arms 43 at the top end thereof limiting insertion of the card into the slot 9, and ensuring that the correct (narrower) end of the card is inserted into the slot. It will be noted (Fig. 1) that one spring 26 biases the arm 24 of the lever 20 against the strip 28, i.e.
normally maintains the contact defined by one end of the strip 27 and the strip 28 closed; and the other spring 2~ biases the arm 24 of the lever 21 away from the strip 29, i.a. normally maintains the contact defined by the other end of the strip 27 and the strip 29 open. For such purpose, when viewed from the front or rear of the casing 1, the arm 24 of the lever 20 is outside of the free end of the strip 28, and the arm 24 of the lever 21 is inside of one top, free end of the strip 27.
A semicircular notch 44 is provided in one side edge of the car 10 near the bottom end thereof, so that when the card 10 "'''' ``"' - S - : ' "~
.
;: ~
` 1 327624 is inserted into the slot 9, the card initially causes the lever 20 to rotate around the pin 22 (clockwise in Fig. 1) to a position in which the free ends of the strips 27 and 28 are spaced apart, i.e. the contact is open. When the lever 20 enters the notch 44 in the card 10, i.e. once the card has been fully inserted, the spring 26 rotates the lever 20 so that the arm 24 pushes the strip 28 into contact with the strip 27 to close the contact. As soon as the other, straight side edge of the card 10 contacts the other lever 21, the latter is caused to rotate to a position where the arm 24 closes the contact defined by the free ends of the strips 27 and 29.
Referring to Figs. 4 to 6, a second embodiment of the invention includes a casing 1, which has the same basic structure as the casing of thè first embodiment of the invention, i.e. the casing 1 defines a rectangular parallelepiped, with a slot 9 in the top wall 2 thereof. Partitions 46, 47 and 48 extend between the front wall 4 and the rear wall 5 to divide the interior of the casing 1 into a cardchamber 50, relay chamber 51 and a bottom, lead chamber 52~ The sides o~ the card chamber 50 are defined by partitions 46 and 47, and the front and rear of such chamber 50 are defined by front and rear partitions 54 and 55, respectively.
The card chamber 50 contains a pair of spring contacts 56, which are mounted on the partition 55, and a pair of spaced contacts 57, which are mounted on the partition 48. One of the :' .
"~.
"~.', .~ ' ' . : :
.-contacts 56 is connected to a battery 60 ( a dry cell) in the chamber 51 by a lead 61. The other contact 56 is connected to the winding of a relay 62 by a lead 64. The other end of the relay winding is connected to the battery 60 by a lead 65. One lead 67 of a cable or wire 68 from a television set 70 is connected to one of the contacts 57, and the other lead 71 is connected to a male plug 72, the leads 67 and 71 entering the chamber 52 at one end 6, and the lead 71 exiting the chamber 52 at the other end 7 thereof. The other contact 57 is connected to conductive relay casing 74 by a lead 75. The casing 74 is also connected to the plug 72 by a lead 76. While not shown, the casing ..
74 is electrically insulated from the contacts 57. ~ ::
The switch device of Figs. 4 and 5 is operated by means ~.
of a card 78 (Fig. 6), which is basically rectangular. The card 78 includes a non-conductive body 79 with a conductive strip 80 at the bottQm end thereof~ When thecard 78 is inserted into the slot 9, the conductive strip 80 first establishes a circuit between the cont`acts 56, the battery 60 and the relay 62, so that the core or plunger 82 of the relay 62 moves outwardly to complete a 20 circui~ between the lead 75 and the lead 76. Thus, when the .~
card 78 is inserted fully into the casing 1, a circuit is . -completed between the lead 67, the contacts 57, through the card strip 80, the lead 75, the relay casing 74 and the lead 76, ~
i~e. between the television set 70 and the plug 72. After the .:~;
25 card 78 is inserted into the slot 10, resistànce will be encountered :
,.. ... .
~' :.
"
-` 1 327624 when the card abuts the contacts 56. If the card remains in this position for a short period of time the relay 62 is fully opened or actuated. The card 78 can be marked to indicate the relay closing position. In this embodiment of the invention, the relay functions as a switch, much as the receptacle 34 of the first embodiment of the invention.
Referring to Figs. 7 to 9, a third embodiment of the invention includes a casing, defined by front and rear walls (not shown) and a rectangular core 84. The core 84 includes a rectangular bottom portion 85 containing leads 67, 71 and 76 from a television set 70 and to the male plug 72, and a top portion 87 defining a hollow rectangular frame containing aligned slots 88 and 89 in the top end 90 thereof.
An arcuate leaf spring 92 is mounted in one side of the rectangular opening 93 through the top end 87 of the core. A
guide lug 94 is mounted near the top end of the other side of the opening 93, and a microswitch 95 is mounted in such other side of the top portion 87 of the core 84, so that the switch lever 96 -extends into the opening 93. Thus, when a non-conducting rectangular card 98 is inserted into the openings 88 and 89, the card closes the switch 95 to complete a circuit between a television set and the male plug 72. A semicircular notch 99 in the card 98 receives ~ -the lug 94 to hold the caxd in position. In this embodiment of -the invention, the contacts and switch are both found in the microswitch 95, i.e. the switch 95 replaces the contacts and female ;~-receptacle of the first embodiment of the invention.
. , - 8 - ~ ~
With reference to Figs. 10 to 12, a fourth embodiment of the invention includes a casing defined by front and rear walls (not shown) and a qenerally U-shaped core 101. The core 101 includes a hollow rectangular base 102 for housing the leads 67, 71 and 76, which are connected to a television set 70 and a male .
plug 72. The leads 67 and 76 are connected to a switch 103 e~uivalent in function to the microswitch 95 of the third embodiment of the invention (Figs. 7 to 9). The switch 103 is recessed in a cylindrical sleeve 104 extending upwardly from the top lD surface o~ the base 102 of the core 101. The ends 106 of the core 101 support inwardly extending, arcuate leaf springs 107.
A slot 109 is provided in the top 110 of the core 101 for receiving a card 112. The card 112 includes a pair of spaced -apart notches 113 in one end thereof bordering a central projection 114. Thus, when the card 112 is inserted into the slot 109, the .:; :
card is centered by the springs 107, so that the projection 114 presses against the switch 103 to complete a circuit between the ~
television set 70 and the plug 72. : :
Thus, there has been described a plurality of relatively simple safety switch devices, which reduce the likelihood that an electrical appliance will be actuated and ~:~
remain "on" unless such actuation is intentional. .
: ' :' ~ :~
_ g _ ~ .:
,,:, .: ' ','''''':
In general, electrical appliances for use in the home are not particularly dangerous. However, there is the distinct risk that a child will turn on an appliance and leave the appliance in operation. Accordingly, a need exists for a switch device which can be used to prevent operation of an electrical appliance merely by flicking a switch or pulling a button. Such need extends to appliances such as television sets, which are often in use without parental consent.
The patent literature contains a variety of switch devices of generally the same type as described herein. Such switch devices are described for example in United States Patents Nos. ~,844,675, which issued to V.R. Edgar on July 22, 1958 and 4,092,506, which issued to C.C. Saulters on May 30, 1978. However, -the patented devices are ill adapted to use in the home, and could themselves prove to be susceptible to tampering by a child.
An object of the present invention is to meet the need mentioned above by providing a relatively simple safety switch device, which is economical in terms of manufacturing costs, and which is virtually childproof.
Another object of the invention is to provide a safety switch device which can be operated either by means of a simple non-conductive card, thus preventing dangerous tampering """.
- 1 - ~
~ 327624 with metal objects, or by means of a conductive portion of a non-conductive card with additional or auxiliary safety means built into the device Accordingly, the present invention relates to a safety switch device comprising casing means; slot means in said casing means for receiving planar card means; first contact means in said casing means for connection to a source of electrical power;
second contact means in said casing means for connection to an electrical appliance; and switch means in said casing means for actuation by said card means to complete an electrically conductive :
path between said first and second contact means.
The invention will be descri~ed in greater detail with reference to the accompanying drawings, which illustrate preferred embodiments of the invention, and wherein:
Figure 1 is a mainly sectioned, schematic, front view of a switch device in accordance with the invention;
Figure 2 is a mainly sectioned, perspective view of the device of Fig. 1 from one side and the front; ``
Figure 3 is a rear perspective view of the device of Figs. 1 and 2;
Figure 4 is a cross-sectional view of a second embodiment of the switch device of the present invention;
Figure 5 is a cross section taken generally along line V-V of Fig. 4;
Figure 6 is a perspective view of a card for use in the ~
device of Figs. 4 and 5; `
Figure 7 is a perspective view of the core of a third embodiment of the switch device of the present invention;
Figure 8 is a schematic, longitudinal sectional view of the device of Fig. 7;
Figure 9 is a perspective view of a card for use in the device of Figs. 7 and 8;
Figure 10 is a perspective view of the core of a fourth embodiment of the switch device in accordance with the present invention;
Figure 11 is a schem~tic, longitudinal sectional view of the device of Fig. 10; and Figure 12 is a perspective view of a card for use in the device of Figs. 10 and 11.
It will be appreciated that wherever po~sible the same lS reference numerals have been used to identify the same or similar elements in the drawings. Moreover, for the sake of simplicity elements and some structural details have been omitted from the drawings.
With reference to Figs. 1 to 3, one form of the switch in accordance with the invention includes a rectangular casing generally indicated at 1 defined by a top wall 2, a bottom wall 3, a front wall 4, a rear wall 5, and end walls 6 and 7. A slot 9 ..
is provided in the top wa.ll 2 for receiving acard 10 (Fig. 3) .:
which is described hereinafter in greater detail. Partitions 12 .
and 13 divide the interior of the casing 1 into a card receiving l 321624 chamber 14, a contact chamber 15 and a switch chamber 16 (Fig. 1).
The card receiving chamber 14 occupies the top central portion of the interior of the casing 1, and includes a slot 18 in each side 19 of the generally U-shaped partition 12 for receiving a disc-shaped lever 20 or 21. Each lever 20 and 21 is -pivotally mounted in the contact chamber 15 of the casing 1 by means of a pin 22. A pair of arms 23 and 24 extend generally upwardly and downwardly, respectively from each lever 20 and 21.
Helical springs 26 connected to the arms 23 and to the casing 1 bias the levers 20 and 21 for rotation around the pins 22 to move the arms 24 toward or away from electrical contacts defined by conductive metal strips 27, 28 and 29.
The strip 27 is mounted in the casing 1, and defines a fixed contact extending between the two levers 20 and 21. Strips 28 and 29 are movable contacts in that they are sufficiently resilient that they can be moved toward or away from the fixed contact (strip 27) and return to their rest positions. The lever 20 no~màlly biases the strip 28 into contact with the strip 27, and the lever 21 does not normally contact the strip 29, thus ~0 permitting the two strips 27 and 28 to remain spaced apart or open.
The bottom end of the strips 28 and 29 are connected to electrical leads 31 and 32 respectively. The lead 31 is connected to one terminal (not shown) of a switch defined by a grounded female receptacle 34 mounted in the switch chamber 16.
The receptacle 34 is intended to receive a male plug (not shown) from an electrical appliance such as a television set (not shown).
The male plug is introduced into the chamber 16 through an opening 35, which is normally closed by a door 36. A V-shaped notch 38 is provided in the end wall 6 for receiving the cable or lead (not shown) carrying the male plug.
The lead 32 is connected to a grounded male plug 40 for plugging into a wall receptacle (not shown) or other female receptacle which is connected to a source of electrical power.
The male plug 40 is also connected to the receptacle 34 by leads 41.
The operation o the above described device will be described with reference to Figs. 1 and 3. As shown in Fig. 3, the card 10 is generally rectangular with wings or arms 43 at the top end thereof limiting insertion of the card into the slot 9, and ensuring that the correct (narrower) end of the card is inserted into the slot. It will be noted (Fig. 1) that one spring 26 biases the arm 24 of the lever 20 against the strip 28, i.e.
normally maintains the contact defined by one end of the strip 27 and the strip 28 closed; and the other spring 2~ biases the arm 24 of the lever 21 away from the strip 29, i.a. normally maintains the contact defined by the other end of the strip 27 and the strip 29 open. For such purpose, when viewed from the front or rear of the casing 1, the arm 24 of the lever 20 is outside of the free end of the strip 28, and the arm 24 of the lever 21 is inside of one top, free end of the strip 27.
A semicircular notch 44 is provided in one side edge of the car 10 near the bottom end thereof, so that when the card 10 "'''' ``"' - S - : ' "~
.
;: ~
` 1 327624 is inserted into the slot 9, the card initially causes the lever 20 to rotate around the pin 22 (clockwise in Fig. 1) to a position in which the free ends of the strips 27 and 28 are spaced apart, i.e. the contact is open. When the lever 20 enters the notch 44 in the card 10, i.e. once the card has been fully inserted, the spring 26 rotates the lever 20 so that the arm 24 pushes the strip 28 into contact with the strip 27 to close the contact. As soon as the other, straight side edge of the card 10 contacts the other lever 21, the latter is caused to rotate to a position where the arm 24 closes the contact defined by the free ends of the strips 27 and 29.
Referring to Figs. 4 to 6, a second embodiment of the invention includes a casing 1, which has the same basic structure as the casing of thè first embodiment of the invention, i.e. the casing 1 defines a rectangular parallelepiped, with a slot 9 in the top wall 2 thereof. Partitions 46, 47 and 48 extend between the front wall 4 and the rear wall 5 to divide the interior of the casing 1 into a cardchamber 50, relay chamber 51 and a bottom, lead chamber 52~ The sides o~ the card chamber 50 are defined by partitions 46 and 47, and the front and rear of such chamber 50 are defined by front and rear partitions 54 and 55, respectively.
The card chamber 50 contains a pair of spring contacts 56, which are mounted on the partition 55, and a pair of spaced contacts 57, which are mounted on the partition 48. One of the :' .
"~.
"~.', .~ ' ' . : :
.-contacts 56 is connected to a battery 60 ( a dry cell) in the chamber 51 by a lead 61. The other contact 56 is connected to the winding of a relay 62 by a lead 64. The other end of the relay winding is connected to the battery 60 by a lead 65. One lead 67 of a cable or wire 68 from a television set 70 is connected to one of the contacts 57, and the other lead 71 is connected to a male plug 72, the leads 67 and 71 entering the chamber 52 at one end 6, and the lead 71 exiting the chamber 52 at the other end 7 thereof. The other contact 57 is connected to conductive relay casing 74 by a lead 75. The casing 74 is also connected to the plug 72 by a lead 76. While not shown, the casing ..
74 is electrically insulated from the contacts 57. ~ ::
The switch device of Figs. 4 and 5 is operated by means ~.
of a card 78 (Fig. 6), which is basically rectangular. The card 78 includes a non-conductive body 79 with a conductive strip 80 at the bottQm end thereof~ When thecard 78 is inserted into the slot 9, the conductive strip 80 first establishes a circuit between the cont`acts 56, the battery 60 and the relay 62, so that the core or plunger 82 of the relay 62 moves outwardly to complete a 20 circui~ between the lead 75 and the lead 76. Thus, when the .~
card 78 is inserted fully into the casing 1, a circuit is . -completed between the lead 67, the contacts 57, through the card strip 80, the lead 75, the relay casing 74 and the lead 76, ~
i~e. between the television set 70 and the plug 72. After the .:~;
25 card 78 is inserted into the slot 10, resistànce will be encountered :
,.. ... .
~' :.
"
-` 1 327624 when the card abuts the contacts 56. If the card remains in this position for a short period of time the relay 62 is fully opened or actuated. The card 78 can be marked to indicate the relay closing position. In this embodiment of the invention, the relay functions as a switch, much as the receptacle 34 of the first embodiment of the invention.
Referring to Figs. 7 to 9, a third embodiment of the invention includes a casing, defined by front and rear walls (not shown) and a rectangular core 84. The core 84 includes a rectangular bottom portion 85 containing leads 67, 71 and 76 from a television set 70 and to the male plug 72, and a top portion 87 defining a hollow rectangular frame containing aligned slots 88 and 89 in the top end 90 thereof.
An arcuate leaf spring 92 is mounted in one side of the rectangular opening 93 through the top end 87 of the core. A
guide lug 94 is mounted near the top end of the other side of the opening 93, and a microswitch 95 is mounted in such other side of the top portion 87 of the core 84, so that the switch lever 96 -extends into the opening 93. Thus, when a non-conducting rectangular card 98 is inserted into the openings 88 and 89, the card closes the switch 95 to complete a circuit between a television set and the male plug 72. A semicircular notch 99 in the card 98 receives ~ -the lug 94 to hold the caxd in position. In this embodiment of -the invention, the contacts and switch are both found in the microswitch 95, i.e. the switch 95 replaces the contacts and female ;~-receptacle of the first embodiment of the invention.
. , - 8 - ~ ~
With reference to Figs. 10 to 12, a fourth embodiment of the invention includes a casing defined by front and rear walls (not shown) and a qenerally U-shaped core 101. The core 101 includes a hollow rectangular base 102 for housing the leads 67, 71 and 76, which are connected to a television set 70 and a male .
plug 72. The leads 67 and 76 are connected to a switch 103 e~uivalent in function to the microswitch 95 of the third embodiment of the invention (Figs. 7 to 9). The switch 103 is recessed in a cylindrical sleeve 104 extending upwardly from the top lD surface o~ the base 102 of the core 101. The ends 106 of the core 101 support inwardly extending, arcuate leaf springs 107.
A slot 109 is provided in the top 110 of the core 101 for receiving a card 112. The card 112 includes a pair of spaced -apart notches 113 in one end thereof bordering a central projection 114. Thus, when the card 112 is inserted into the slot 109, the .:; :
card is centered by the springs 107, so that the projection 114 presses against the switch 103 to complete a circuit between the ~
television set 70 and the plug 72. : :
Thus, there has been described a plurality of relatively simple safety switch devices, which reduce the likelihood that an electrical appliance will be actuated and ~:~
remain "on" unless such actuation is intentional. .
: ' :' ~ :~
_ g _ ~ .:
,,:, .: ' ','''''':
Claims (11)
1. A safety switch device comprising casing means; slot means in said casing means for receiving planar card means; means for centering said card in said casing means; first electrically conductive contact means in said casing means for connection to a source of electrical power; second electrically conductive contact means in said casing means normally spaced from said first contact means for connection to an electrical appliance; socket means in said casing means connected to one said contact means for receiving an electrical plug; and plug means connected to the other said contact means for insertion into an electrical wall socket; switch means in said casing means for actuation by said card means to complete an electrically conductive path between said first and second contact means.
2. A device according to claim 1, wherein said first and second contact means include spaced apart conductors, and said switch means includes lever means pivotal in said casing means for rotation by said card means to move said conductors together for closing a circuit therebetween.
3. A device according to claim 2, including spring means biasing said lever means to a rest position in which said conductors are spaced apart, whereby, in the absence of said card means the circuit between the conductors is open.
4. A device according to claim 1, including relay means in said casing means connected to said contact means and to said switch means for actuating by closing of said switch means to delay completion of the conductive path between said contact means.
5. A device according to claim 1, wherein said switch means is located on one side of said slot means for closing by one side edge of said card means the device including spring means located on the opposite side edge of said slot means for biasing the card against said switch means.
6. A device according to claim 1, wherein said switch means incorporate said first and second contact means.
7. A device according to claim 1, wherein said means for centering said card means in said casing means includes at least one spring means.
8. A device according to claim 7, wherein said casing means defines a thin parallellepided, with said slot means in one end thereof and a rectangular chamber therein, said switch means being located on an end of said casing means opposite to said slot means.
9. A device according to claim 1, wherein said planar card means is imperforate.
10. A device according to claim 7, wherein said spring means includes a spring on each side of said chamber for pressing against the side edges of said card means.
11
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 545683 CA1327624C (en) | 1987-08-28 | 1987-08-28 | Tv cut-out |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 545683 CA1327624C (en) | 1987-08-28 | 1987-08-28 | Tv cut-out |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1327624C true CA1327624C (en) | 1994-03-08 |
Family
ID=4136361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 545683 Expired - Fee Related CA1327624C (en) | 1987-08-28 | 1987-08-28 | Tv cut-out |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1327624C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1071048A2 (en) * | 1999-07-21 | 2001-01-24 | IAR-SILTAL S.p.A. | Device for the safety activation of household appliances and the like |
| EP1566821A1 (en) * | 2004-02-21 | 2005-08-24 | Leao Wang | Emergency switch for an exercise apparatus |
-
1987
- 1987-08-28 CA CA 545683 patent/CA1327624C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1071048A2 (en) * | 1999-07-21 | 2001-01-24 | IAR-SILTAL S.p.A. | Device for the safety activation of household appliances and the like |
| EP1071048A3 (en) * | 1999-07-21 | 2003-12-03 | IAR-SILTAL S.p.A. | Device for the safety activation of household appliances and the like |
| EP1566821A1 (en) * | 2004-02-21 | 2005-08-24 | Leao Wang | Emergency switch for an exercise apparatus |
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