CA1254603A - Alternate off-on switch - Google Patents
Alternate off-on switchInfo
- Publication number
- CA1254603A CA1254603A CA000558762A CA558762A CA1254603A CA 1254603 A CA1254603 A CA 1254603A CA 000558762 A CA000558762 A CA 000558762A CA 558762 A CA558762 A CA 558762A CA 1254603 A CA1254603 A CA 1254603A
- Authority
- CA
- Canada
- Prior art keywords
- plunger
- stationary
- base
- blade
- switch
- 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
Links
Abstract
Abstract An alternate mechanism comprising a plunger supported for a linear movement, a rotary cam rotatably supported by the plunger, a spring for biasing the plunger toward an original position of the plunger, a first stationary cam which as the plunger is pushed to a first position against the spring, is adapted to be engaged with the rotary cam so as to rotate the rotary cam by a predetermined angle, and a second stationary cam which as the plunger supporting the rotary cam at the predetermined angle returns from the first position, is engaged with the rotary cam so as to lock the plunger in a second position, and as the plunger locked in the second position is pushed again, the rotary cam is further rotated by the first stationary cam so as to be disengaged from the second stationary cam when the plunger returns to the second position.
Description
a~3 Alternate On-Off Switch This invention relates to an alternate mechanism, and more particularly, to an improved alternate mechanism which may be employed in a push-on-and-push-off switch.
It is a divisional of Canadian application Serial No.
418,672, filed December 29, 1982.
There is well known an alternate mechanism which includes a heart-shaped groove ~ormed on a plunger and a spring-biased swingable lever having.a fixed base end so that a free end of the swingable lever swings along the heart-shaped groove. Such a conventional alternate mecha-nism, however, has the disa2vantage that the mechanical life of the mechanism is not satisfactory due to extreme dimensional accuracy requirements of the swingable lever, abrasion of plastics by sliding metal and the like.
Moreover, each detailed dimension of the swingable lever must be precisely adjusted with the heart-shaped groove on assembling so as to avoid any misoperation of the mecha-nism, so that its assembling work is complicated and 20. expensive.
It is, therefore, a primary object of this invention to provide an alternate mechanism which has a long mechanical life, operates consistently, and is easy to assemble.
Thus, the present invention relates to an alternate on-off switch comprising in combinaticn: a tube shaped plunger member having a card member formed on an inner wall of the plunger member; a base member; a stationary blade supported by the base member; a movable blade supported by the base member so as to be actuated by said card member; a cover member surrounding said plunger member; and a switch mechanism located between said plunger member and said cover member; wherein said stationary blade and said movable blade are located inside said plunger member; wherein said cover member is mounted on said base member and encloses said plunger member and said switch mechanism; and wherein the card member on the plunger member moves said movable blade out of contact with said stationary blade and moves in a direction which is substantially parallel to said stationary and movable blades.
Certain preferred embodiments of the invention are illustrated by the attached drawings in which:
Fig, 1 is a partially sectional elevation view of a keyboard switch employing an alternate mechanism as a preferred embodiment of this invention;
~ig. 2 is a perspective disassembled view of the keyboard switch of Fig. l;
Fig. 3 is an elevation view of a light emitting diode employed in the switch of Fig. 2;
Fig. 4 is the alternate mechanism employed in the switch of Fig. l; and Figs. 5, 6 and 7 are perspective views illustrating a sequence of processes for making a base member employed in the device of Fig. 2.
Detailed Description Referring to Figs. 1 and 2, there is shown an alternate mechanism or push-on-and-push-off mechanism which is employed in a keyboard switch as a preferred embodiment of this invention. Base member 1 is an insert-molded plastic member carrying a contact member 2, a locking clip 11 and a light emitting diode (hereinafter, abbreviated as LED) supporter 12 as a single molded unit. A cover 3 is mounted on the base member 1 by engagement with the locking clip 11 so as to support a plunger member 4 for vertical sliding movement within the cover 3. The plunger member 4 is ( upwardly biased by a recessed coil spring 43 within the cover 3. The case 3 consists of a lower portion of a square cylindrical shape, and an upper portion of a cylin-drical shape through which a head portion of the plunger member 4 projects so as to accept a key button 5. As illu-strated in Fig. 2, ~here is disposed a window portion 31 on an upper wall of the square portion of the cover 3. The window portion 31 is normally closed by a thin plate which is molded together with the cover 3 as a single unit and is easily broken to form a hole extending through the window portion 31 if desired.
As illustrated in Fig. 3, the LED supporter 12 is dis-posed to support a LED 6 on a head portion of the suppor~er 12. Though other reference numerals in Fig. 3 are made in reference to components in the left-hand of the drawing for a simplified explanation, Fig. 3 should read that the reference numerals 14, 62, 13 and 61 are drawn to the corresponding components depicted in the right-hand of the drawing. A pair of terminals 61 of the LED 6 are so guided by grooves 13 that projecting portions 62 of the terminals 61 are engaged with recesses 14 formed in the grooves 13 for temporarily fixing the LED in position. As the cover 3 is mounted on the base 1, the temporarily fixed LED 6 is sandwiched between the supporter 12 and an inner wall surface of the cover so as to fix the LED in position.
Then, the lead terminals 61 are guided by the grooves 31 so as to extend below the base member 1, so that any addi-tional connection terminals for the LED need not be dis-posed on the base member 1. The light emitted from the LED 6 through the window 31 is guided by a transparent member 51 embedded in the key button 5 so as to radiate therefrom. Since the window portion 31 is closed by the thin plate on molding, it must be broken in advance 50 as to receive the LED 6.
If the keyboard switch of Fig. 2 is designed for a non-illuminated switch, it has only to be modified in such a ( manner that the LED 6 i5 not employed, the key button 5 does not have the transparent member 51 and the thin plate in the window portion 31 is not broken. Thus, by employing such common components, this keyboard switch i5 convertible with ease b~tween illuminated and non-illuminated switches.
Since the window portion 31 in such a non-illuminated switch is closed, any foreign matter, such as external dust or the like, is prevented from entering the cover 3. Alternatively, if the keyboard æwitch is desired to be solely designed for this illuminated LED switch, the window portion 31 may be molded to include a hole extending therethrough.
The plunger member 4 on its lower opposite side walls includes a pair of stub shafts 42 on which rotary cam 71 is rotatably mounted. As illustrated in more detail in Fig. 4, the rotary cam 71 is symmetrical about center hole 70 pierced by the shaft 42. The rotary cam 71 at its periphery is provided with a symmetrical pair of grooves 72 and 74 and a pair of sloping surfaces 73 and 75. A first stationary cam 76 having a projection 77 is mounted on a recessed step formed on the base member 1 so as to be fixed by a projec-tion formed on an inner wall of the cover 3 as mounted. A
second stationary cam 32 is formed on an inner side wall surface of the cover 3 as a single molding.
The operations of the alternate mechanism according to this embodiment will be described hereinafter with reference to Fig. 4.
Where the plunger member 4 is in a normal position, viz., in the highest position, the shaft 42 is in position Pl.
As the plunger member 4 is downwardly depressed in accordance with the external depression applied to the key button 5 and the shaft 42 comes into position P2, the cam 71 takes the position shown by the two dotted lines 71a where a lower surface of the cam 71 comes in contact with an upper surfaGe of the projection 77 of the stationary cam 76. As the plunger member 4 is further depressed, the top end of the projection 77 comes in contact with the groove 74 ( of the rotary cam 71 and the shaft 42 comes into position P3 where the rotary cam 71 takes the angular position rotated by about 10 degrees as shown by the two dotted lines 71b. If the key button 5 is released, the rotary cam 71 upwardly moves at the same angular position of about 10 degrees but is stopped by the bottom end 33 of the stationary cam 32, engaging with the upper groove 72 of the cam 71. Then, the shaft 42 is locked in position P4, and the cam 71 takes the position shown in the two dotted lines 71c. If the key button 5 is depressed again, the plunger member 4 is depressed downwardly and the lower sloping surface 75 comes in contact wi~h the upper surface 77 of the stationary cam 76 because as the upper groove 72 was engaged with the bottom end 33 in the former operation, the cam 71 has been further rotated in a counterclockwise direction and thus retains the same angular position. Upon further depression of button 5, the rotary cam 71 further rotates counterclockwise because of the slope 75 engaged with the slope 77. Upon releasing button 5, the plunger member 4 moves upwardly and the rotary cam 71 further rotates counter-clockwise because the upper sloping surface 73 and a side wall of the cam 71 are pushed by the bottom end 33 of the secondary stationary cam 32, so that the rotary cam 71 returns to its original position where the shaft 42 is in position Pl.
Thus, the rotary cam 71 is gradually rotated by the stationary cams 76 and 32, so that there is provided an alternate mechanism or a push-on-and-push-off mechanism such that it is locked upon a first depression applied to the key button 5 and is unlocked upon a second depression after releasing of the first depression. It should be understood that the rotary cam 71 is tightly supported by the shaft 42 to such an extent that the cam 71 can be rotated only by the cams 76 and 32 and is hard to rotate because of external mechanical shock to the cam 71.
If the keyboard switch is desired to be of a non-alternate mechanism type or a momen~ary type having no locking function, the rotary cam 71 and/or the stationary cam 76 need only be omitted. Thus, by adding only a small number of components, the keyboard switch according to this embodiment can be modified from the momentary type to the alternate type. Alternatively, the first cam 76 may be molded to further include the second cam 32 so as to be mounted on the base member 1 as a single component. Or, the first and second cams 76 and 32 may be modified to be formed on an inner wall surface of the plunger member 4.
Further alternatively, the first and the second cam 76 and 32 may be formed on an inner wall surface of the plunger member 4 and the base member 1, respectively.
Referring to Figs. 1 and 2, the contact member 2 consists of an arch-shaped stationary blade 21 having a pair of legs 22 and a springy movable blade 25. The respective blades 21 and 25 carry respective contacts 23 and 26.
The contact member 2 may be assembled by the following automated producing processes: In the first step, as illu-strated in section A of Fig. 5, a single metal plate 29 is stamped out to form a hoop-shaped member including the stationary blade 21, a pair of legs 22, a terminal 24, and a contact 23. In the subsequent step, as illustrated in section B of Fig. 5, a hoop-shaped member having the movable blade 25 is driven to a predetermined position above the hoop-shaped plate 29 from a side direction. In advance, the movable blade 25 is formed by stamping out a metal plate, the contact 26 is disposed on the blade 25 at its free end, and a bent portion 27 is formed. As the movable blade 25 reaches the above-mentioned predetermined position, it is put upon the plate 29 so as to fixedly mount base end of the blade 25 on the terminal blade 24.
Then, a connecting portion of the movable blade 25 is cut off so as to form a component as illustrated in section C
( of Fig. 5. ~urther, a connecting portion 28 of the ter-minal blade 24 is cut off to form a component as illu-strated in section D of Fig. 5. Then, each such component is separated one by one so as to form an isolated compo-nent as shown in Fig. 6. Further, the metal plate of Fig.
6 is inserted in a molded plastic member by an insert-molding process so as to form base member 1 as illustrated in Fig. 7. Finally, a peripheral frame portion of the component of Fig. 7 is cut off so as to constitute the base member 2 shown in Fig. 2.
According to this assembled contact component 2, the legs 22 of the stationary blade 21 downwardly extend through the base member 1 to form connection ter~inals, and the terminal blade 24 and the blade 21 are made of a single plate so that they can be thick and solid.
Therefore, the keyboard switch is easy to be mounted on a printed circuit board without deforming its connecting terminals, i.e., the bottom ends of the blades 24 and 21.
Moreover, since the switching terminal 24 is positioned between a pair of interconnected terminals 22, the keyboard switch can easily be used in a simplified connection pat-tern on a printed circuit board~ That is, according to an associated circuit pattern on the board, either of the ter-minals 2 can be connected to other components on the board.
Where the plunger member 4 is in the highest position, the bent portion 27 of the movable blade 25 is pushed by a card or slide pro]ection 41 formed within or on the plunger member 4 so that the contacts 23 and 26 are separated from each other as illustrated in Fig. 1. As the card 41 moves downwardly upon depressing the key button 5, the card 41 slides on a surface of the portion 27 downwardly so that the springy blade 25 returns in a leftward direction as shown in Fig. 1 to close the contacts 23 and 26. Thus, as the button 5 is depressed or locked in a depressed position, the terminals 22 and 24 make a closed circuit.
3;~
( On the contrary, as such depression or lock is released, the terminal 21 and 24 provides an opened circuit.
According to this embodiment, the cover 3 is a molded plastic member having no opening as assembled, so that the assembled keyboard switch is protected from any external foreign matter. Further, according to this invention, there is provided an alternate mechanism which can have a long mechanical life and provide a high electrical insula-tion therein because the rotary cam and stationary cams are plastic mold members with accurate dimensions and thus engage with one another without abrasion. Moreover, since the respective components constituting the alternate mecha-nism are molded in highly accurate dimensions, any mis-operation, such as inoperative lock and so forth, is prevented from occurring, and any adjustment on assembling is unnecessary. By such a simplified assembly, the alter-nate mechanism can be produced at a reduced cost. If desired, of course, some components of the alternate mechanism may be of metal.
It should be understood that the above description is merely illustrative of this invention and that many changes and modifications may be made by those skilled in the art without departing from the scope of the appended claims.
It is a divisional of Canadian application Serial No.
418,672, filed December 29, 1982.
There is well known an alternate mechanism which includes a heart-shaped groove ~ormed on a plunger and a spring-biased swingable lever having.a fixed base end so that a free end of the swingable lever swings along the heart-shaped groove. Such a conventional alternate mecha-nism, however, has the disa2vantage that the mechanical life of the mechanism is not satisfactory due to extreme dimensional accuracy requirements of the swingable lever, abrasion of plastics by sliding metal and the like.
Moreover, each detailed dimension of the swingable lever must be precisely adjusted with the heart-shaped groove on assembling so as to avoid any misoperation of the mecha-nism, so that its assembling work is complicated and 20. expensive.
It is, therefore, a primary object of this invention to provide an alternate mechanism which has a long mechanical life, operates consistently, and is easy to assemble.
Thus, the present invention relates to an alternate on-off switch comprising in combinaticn: a tube shaped plunger member having a card member formed on an inner wall of the plunger member; a base member; a stationary blade supported by the base member; a movable blade supported by the base member so as to be actuated by said card member; a cover member surrounding said plunger member; and a switch mechanism located between said plunger member and said cover member; wherein said stationary blade and said movable blade are located inside said plunger member; wherein said cover member is mounted on said base member and encloses said plunger member and said switch mechanism; and wherein the card member on the plunger member moves said movable blade out of contact with said stationary blade and moves in a direction which is substantially parallel to said stationary and movable blades.
Certain preferred embodiments of the invention are illustrated by the attached drawings in which:
Fig, 1 is a partially sectional elevation view of a keyboard switch employing an alternate mechanism as a preferred embodiment of this invention;
~ig. 2 is a perspective disassembled view of the keyboard switch of Fig. l;
Fig. 3 is an elevation view of a light emitting diode employed in the switch of Fig. 2;
Fig. 4 is the alternate mechanism employed in the switch of Fig. l; and Figs. 5, 6 and 7 are perspective views illustrating a sequence of processes for making a base member employed in the device of Fig. 2.
Detailed Description Referring to Figs. 1 and 2, there is shown an alternate mechanism or push-on-and-push-off mechanism which is employed in a keyboard switch as a preferred embodiment of this invention. Base member 1 is an insert-molded plastic member carrying a contact member 2, a locking clip 11 and a light emitting diode (hereinafter, abbreviated as LED) supporter 12 as a single molded unit. A cover 3 is mounted on the base member 1 by engagement with the locking clip 11 so as to support a plunger member 4 for vertical sliding movement within the cover 3. The plunger member 4 is ( upwardly biased by a recessed coil spring 43 within the cover 3. The case 3 consists of a lower portion of a square cylindrical shape, and an upper portion of a cylin-drical shape through which a head portion of the plunger member 4 projects so as to accept a key button 5. As illu-strated in Fig. 2, ~here is disposed a window portion 31 on an upper wall of the square portion of the cover 3. The window portion 31 is normally closed by a thin plate which is molded together with the cover 3 as a single unit and is easily broken to form a hole extending through the window portion 31 if desired.
As illustrated in Fig. 3, the LED supporter 12 is dis-posed to support a LED 6 on a head portion of the suppor~er 12. Though other reference numerals in Fig. 3 are made in reference to components in the left-hand of the drawing for a simplified explanation, Fig. 3 should read that the reference numerals 14, 62, 13 and 61 are drawn to the corresponding components depicted in the right-hand of the drawing. A pair of terminals 61 of the LED 6 are so guided by grooves 13 that projecting portions 62 of the terminals 61 are engaged with recesses 14 formed in the grooves 13 for temporarily fixing the LED in position. As the cover 3 is mounted on the base 1, the temporarily fixed LED 6 is sandwiched between the supporter 12 and an inner wall surface of the cover so as to fix the LED in position.
Then, the lead terminals 61 are guided by the grooves 31 so as to extend below the base member 1, so that any addi-tional connection terminals for the LED need not be dis-posed on the base member 1. The light emitted from the LED 6 through the window 31 is guided by a transparent member 51 embedded in the key button 5 so as to radiate therefrom. Since the window portion 31 is closed by the thin plate on molding, it must be broken in advance 50 as to receive the LED 6.
If the keyboard switch of Fig. 2 is designed for a non-illuminated switch, it has only to be modified in such a ( manner that the LED 6 i5 not employed, the key button 5 does not have the transparent member 51 and the thin plate in the window portion 31 is not broken. Thus, by employing such common components, this keyboard switch i5 convertible with ease b~tween illuminated and non-illuminated switches.
Since the window portion 31 in such a non-illuminated switch is closed, any foreign matter, such as external dust or the like, is prevented from entering the cover 3. Alternatively, if the keyboard æwitch is desired to be solely designed for this illuminated LED switch, the window portion 31 may be molded to include a hole extending therethrough.
The plunger member 4 on its lower opposite side walls includes a pair of stub shafts 42 on which rotary cam 71 is rotatably mounted. As illustrated in more detail in Fig. 4, the rotary cam 71 is symmetrical about center hole 70 pierced by the shaft 42. The rotary cam 71 at its periphery is provided with a symmetrical pair of grooves 72 and 74 and a pair of sloping surfaces 73 and 75. A first stationary cam 76 having a projection 77 is mounted on a recessed step formed on the base member 1 so as to be fixed by a projec-tion formed on an inner wall of the cover 3 as mounted. A
second stationary cam 32 is formed on an inner side wall surface of the cover 3 as a single molding.
The operations of the alternate mechanism according to this embodiment will be described hereinafter with reference to Fig. 4.
Where the plunger member 4 is in a normal position, viz., in the highest position, the shaft 42 is in position Pl.
As the plunger member 4 is downwardly depressed in accordance with the external depression applied to the key button 5 and the shaft 42 comes into position P2, the cam 71 takes the position shown by the two dotted lines 71a where a lower surface of the cam 71 comes in contact with an upper surfaGe of the projection 77 of the stationary cam 76. As the plunger member 4 is further depressed, the top end of the projection 77 comes in contact with the groove 74 ( of the rotary cam 71 and the shaft 42 comes into position P3 where the rotary cam 71 takes the angular position rotated by about 10 degrees as shown by the two dotted lines 71b. If the key button 5 is released, the rotary cam 71 upwardly moves at the same angular position of about 10 degrees but is stopped by the bottom end 33 of the stationary cam 32, engaging with the upper groove 72 of the cam 71. Then, the shaft 42 is locked in position P4, and the cam 71 takes the position shown in the two dotted lines 71c. If the key button 5 is depressed again, the plunger member 4 is depressed downwardly and the lower sloping surface 75 comes in contact wi~h the upper surface 77 of the stationary cam 76 because as the upper groove 72 was engaged with the bottom end 33 in the former operation, the cam 71 has been further rotated in a counterclockwise direction and thus retains the same angular position. Upon further depression of button 5, the rotary cam 71 further rotates counterclockwise because of the slope 75 engaged with the slope 77. Upon releasing button 5, the plunger member 4 moves upwardly and the rotary cam 71 further rotates counter-clockwise because the upper sloping surface 73 and a side wall of the cam 71 are pushed by the bottom end 33 of the secondary stationary cam 32, so that the rotary cam 71 returns to its original position where the shaft 42 is in position Pl.
Thus, the rotary cam 71 is gradually rotated by the stationary cams 76 and 32, so that there is provided an alternate mechanism or a push-on-and-push-off mechanism such that it is locked upon a first depression applied to the key button 5 and is unlocked upon a second depression after releasing of the first depression. It should be understood that the rotary cam 71 is tightly supported by the shaft 42 to such an extent that the cam 71 can be rotated only by the cams 76 and 32 and is hard to rotate because of external mechanical shock to the cam 71.
If the keyboard switch is desired to be of a non-alternate mechanism type or a momen~ary type having no locking function, the rotary cam 71 and/or the stationary cam 76 need only be omitted. Thus, by adding only a small number of components, the keyboard switch according to this embodiment can be modified from the momentary type to the alternate type. Alternatively, the first cam 76 may be molded to further include the second cam 32 so as to be mounted on the base member 1 as a single component. Or, the first and second cams 76 and 32 may be modified to be formed on an inner wall surface of the plunger member 4.
Further alternatively, the first and the second cam 76 and 32 may be formed on an inner wall surface of the plunger member 4 and the base member 1, respectively.
Referring to Figs. 1 and 2, the contact member 2 consists of an arch-shaped stationary blade 21 having a pair of legs 22 and a springy movable blade 25. The respective blades 21 and 25 carry respective contacts 23 and 26.
The contact member 2 may be assembled by the following automated producing processes: In the first step, as illu-strated in section A of Fig. 5, a single metal plate 29 is stamped out to form a hoop-shaped member including the stationary blade 21, a pair of legs 22, a terminal 24, and a contact 23. In the subsequent step, as illustrated in section B of Fig. 5, a hoop-shaped member having the movable blade 25 is driven to a predetermined position above the hoop-shaped plate 29 from a side direction. In advance, the movable blade 25 is formed by stamping out a metal plate, the contact 26 is disposed on the blade 25 at its free end, and a bent portion 27 is formed. As the movable blade 25 reaches the above-mentioned predetermined position, it is put upon the plate 29 so as to fixedly mount base end of the blade 25 on the terminal blade 24.
Then, a connecting portion of the movable blade 25 is cut off so as to form a component as illustrated in section C
( of Fig. 5. ~urther, a connecting portion 28 of the ter-minal blade 24 is cut off to form a component as illu-strated in section D of Fig. 5. Then, each such component is separated one by one so as to form an isolated compo-nent as shown in Fig. 6. Further, the metal plate of Fig.
6 is inserted in a molded plastic member by an insert-molding process so as to form base member 1 as illustrated in Fig. 7. Finally, a peripheral frame portion of the component of Fig. 7 is cut off so as to constitute the base member 2 shown in Fig. 2.
According to this assembled contact component 2, the legs 22 of the stationary blade 21 downwardly extend through the base member 1 to form connection ter~inals, and the terminal blade 24 and the blade 21 are made of a single plate so that they can be thick and solid.
Therefore, the keyboard switch is easy to be mounted on a printed circuit board without deforming its connecting terminals, i.e., the bottom ends of the blades 24 and 21.
Moreover, since the switching terminal 24 is positioned between a pair of interconnected terminals 22, the keyboard switch can easily be used in a simplified connection pat-tern on a printed circuit board~ That is, according to an associated circuit pattern on the board, either of the ter-minals 2 can be connected to other components on the board.
Where the plunger member 4 is in the highest position, the bent portion 27 of the movable blade 25 is pushed by a card or slide pro]ection 41 formed within or on the plunger member 4 so that the contacts 23 and 26 are separated from each other as illustrated in Fig. 1. As the card 41 moves downwardly upon depressing the key button 5, the card 41 slides on a surface of the portion 27 downwardly so that the springy blade 25 returns in a leftward direction as shown in Fig. 1 to close the contacts 23 and 26. Thus, as the button 5 is depressed or locked in a depressed position, the terminals 22 and 24 make a closed circuit.
3;~
( On the contrary, as such depression or lock is released, the terminal 21 and 24 provides an opened circuit.
According to this embodiment, the cover 3 is a molded plastic member having no opening as assembled, so that the assembled keyboard switch is protected from any external foreign matter. Further, according to this invention, there is provided an alternate mechanism which can have a long mechanical life and provide a high electrical insula-tion therein because the rotary cam and stationary cams are plastic mold members with accurate dimensions and thus engage with one another without abrasion. Moreover, since the respective components constituting the alternate mecha-nism are molded in highly accurate dimensions, any mis-operation, such as inoperative lock and so forth, is prevented from occurring, and any adjustment on assembling is unnecessary. By such a simplified assembly, the alter-nate mechanism can be produced at a reduced cost. If desired, of course, some components of the alternate mechanism may be of metal.
It should be understood that the above description is merely illustrative of this invention and that many changes and modifications may be made by those skilled in the art without departing from the scope of the appended claims.
Claims (5)
1. An alternate on-off switch comprising in combination:
a tube shaped plunger member having a card member formed on an inner wall of the plunger member;
a base member;
a stationary blade supported by the base member;
a movable blade supported by the base member so as to be actuated by said card member;
a cover member surrounding said plunger member; and a switch mechanism located between said plunger member and said cover member;
wherein said stationary blade and said movable blade are located inside said plunger member;
wherein said cover member is mounted on said base member and encloses said plunger member and said switch mechanism;
and wherein the card member on the plunger member moves said movable blade out of contact with said stationary blade and moves in a direction which is substantially parallel to said stationary and movable blades.
a tube shaped plunger member having a card member formed on an inner wall of the plunger member;
a base member;
a stationary blade supported by the base member;
a movable blade supported by the base member so as to be actuated by said card member;
a cover member surrounding said plunger member; and a switch mechanism located between said plunger member and said cover member;
wherein said stationary blade and said movable blade are located inside said plunger member;
wherein said cover member is mounted on said base member and encloses said plunger member and said switch mechanism;
and wherein the card member on the plunger member moves said movable blade out of contact with said stationary blade and moves in a direction which is substantially parallel to said stationary and movable blades.
2. The apparatus as set forth in Claim 1, wherein said stationary and movable blades are substantially parallel to each other and are perpendicular to said base.
3. An on-off switch comprising in combination:
a plunger member having a card member affixed thereto;
a base;
a stationary arch shaped blade having a pair of fixed blades having one end of each mounted on said base and a contact point for said switch located on said arch;
a movable blade mounted on said base substantially parallel to said stationary arch shaped blade and interposed between said fixed blades and having a contact which engages said contact point when said switch is on, and which has a bent portion which is engaged by said card member; and whereby movement parallel to said fixed blades and said movable blade of said plunger and card member against said bent portion opens and closes the switch at said contact point.
a plunger member having a card member affixed thereto;
a base;
a stationary arch shaped blade having a pair of fixed blades having one end of each mounted on said base and a contact point for said switch located on said arch;
a movable blade mounted on said base substantially parallel to said stationary arch shaped blade and interposed between said fixed blades and having a contact which engages said contact point when said switch is on, and which has a bent portion which is engaged by said card member; and whereby movement parallel to said fixed blades and said movable blade of said plunger and card member against said bent portion opens and closes the switch at said contact point.
4. The apparatus of claim 3, wherein said blades are substantially perpendicular to said base and in vertical position.
5. An alternate on-off switch comprising in combination:
a tube shaped plunger member having a card member formed on an inner wall of the plunger member;
a base member;
a stationary blade supported by the base member;
a movable blade supported by the base member so as to be actuated by said card member;
a cover member surrounding said plunger member; and a switch mechanism located between said plunger member and said cover member;
wherein said stationary blade and said movable blade are located inside said plunger member;
wherein said cover member is mounted on said base member and encloses said plunger member and said switch mechanism;
and wherein said stationary blade comprises separate, essentially parallel legs, and wherein said movable blade has a bent portion which projects through the opening formed between the legs of the stationary blade.
a tube shaped plunger member having a card member formed on an inner wall of the plunger member;
a base member;
a stationary blade supported by the base member;
a movable blade supported by the base member so as to be actuated by said card member;
a cover member surrounding said plunger member; and a switch mechanism located between said plunger member and said cover member;
wherein said stationary blade and said movable blade are located inside said plunger member;
wherein said cover member is mounted on said base member and encloses said plunger member and said switch mechanism;
and wherein said stationary blade comprises separate, essentially parallel legs, and wherein said movable blade has a bent portion which projects through the opening formed between the legs of the stationary blade.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP196815/81 | 1981-12-29 | ||
| JP19681581U JPS58101432U (en) | 1981-12-29 | 1981-12-29 | keyboard switch |
| JP438282A JPS58121517A (en) | 1982-01-13 | 1982-01-13 | Alternating mechanism |
| JP4382/82 | 1982-01-13 | ||
| CA000418672A CA1237751A (en) | 1981-12-29 | 1982-12-29 | Cam actuated alternate on-off push button switch |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000418672A Division CA1237751A (en) | 1981-12-29 | 1982-12-29 | Cam actuated alternate on-off push button switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1254603A true CA1254603A (en) | 1989-05-23 |
Family
ID=27167317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000558762A Expired CA1254603A (en) | 1981-12-29 | 1988-02-11 | Alternate off-on switch |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1254603A (en) |
-
1988
- 1988-02-11 CA CA000558762A patent/CA1254603A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |