EP0157037A2 - Long-stroke push-button switch - Google Patents
Long-stroke push-button switch Download PDFInfo
- Publication number
- EP0157037A2 EP0157037A2 EP84306247A EP84306247A EP0157037A2 EP 0157037 A2 EP0157037 A2 EP 0157037A2 EP 84306247 A EP84306247 A EP 84306247A EP 84306247 A EP84306247 A EP 84306247A EP 0157037 A2 EP0157037 A2 EP 0157037A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch
- keytop
- travel
- lever
- spring
- 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.)
- Withdrawn
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
- H01H13/705—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/002—Longer travel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2219/00—Legends
- H01H2219/036—Light emitting elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2219/00—Legends
- H01H2219/054—Optical elements
- H01H2219/062—Light conductor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2221/00—Actuators
- H01H2221/024—Transmission element
- H01H2221/026—Guiding or lubricating nylon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2233/00—Key modules
- H01H2233/05—Actuator part on body
- H01H2233/054—Snap coupling
- H01H2233/056—Snap coupling with limited freedom
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2237/00—Mechanism between key and laykey
- H01H2237/004—Cantilever
Definitions
- the present invention relates to push-button switches, and in particular long-stroke switches which can be used in a group, such as a keyboard, or individually as a discrete stand-alone switch.
- a long-stroke switch is understood by industrial convention to have a travel of 2.28mm (0.090 inch) or more, as opposed to short-stroke and medium- stroke switches, which have a travel of 0.5mm (0.020 inch) or less and between 0.5mm and 1.5mm (0.020 and 0.060 inch), respectively.
- Short-stroke switches offer only limited perceived movement to the user. That is, it is often difficult for the user to "feel” that the switch has moved.
- Long-stroke switches provide excellent tactile response and "feel”.
- the present invention provides a long-stroke push-button switch assembly.
- the switch assembly comprises a housing supported on a base and depressible key means operatively associated with the housing and arranged for reciprocable travel relative to the housing.
- Normally-open short-stroke contact means are provided below the base, with the axis of movement of the contact means being parallel to but spaced from the axis of movement of the key means.
- a lever means is pivotably mounted relative to the housing and operatively associated with the contact means for closing the contact means when the key means is depressed.
- a spring means interconnects the key means and the lever means.
- the keytop 12 is arranged for reciprocal travel relative to a housing 22. As best seen in Figures 2 to 4, the keytop 12 is substantially in the shape of an inverted hollow cube open at one end. The keytop 12 thus fits over the housing 22, and moves reciprocally with respect to the housing.
Abstract
A long-stroke push-button switch has contacts which close in the middle of the travel and remain closed through the last half of the travel. The switch has a keytop (12) and a lever (42) interconnected by a stiff spring (38). One end of the lever is pivotably mounted (at 92) in the switch housing. A downwardly projecting actuator (84) located on the underside of the lever rests upon the top of a normally-open snap-dome switch (78,80). The axis of the snap-dome switch is located off-centre with respect to the centre line of the keytop. When the keytop (12) is depressed, the spring (38) is compressed during the first half of the keytop travel. When the spring is partially compressed, further pressure on the keytop causes the lever (42) to pivot and close the snap-dome switch contacts (78, 80) in the middle of the travel. Continued pressure on the keytop (12) further compresses the spring and allows the keytop to move through the last half of the travel after the contacts have closed.
Description
- The present invention relates to push-button switches, and in particular long-stroke switches which can be used in a group, such as a keyboard, or individually as a discrete stand-alone switch.
- A long-stroke switch is understood by industrial convention to have a travel of 2.28mm (0.090 inch) or more, as opposed to short-stroke and medium- stroke switches, which have a travel of 0.5mm (0.020 inch) or less and between 0.5mm and 1.5mm (0.020 and 0.060 inch), respectively. Short-stroke switches offer only limited perceived movement to the user. That is, it is often difficult for the user to "feel" that the switch has moved. Long-stroke switches, on the other hand, provide excellent tactile response and "feel".
- A need exists for a long-stroke push-button switch with contacts which close in the middle of the travel and remain closed through the last half of the travel. such a switch should also be capable of being easily illuminated.
- A long-stroke switch can be constructed using a lever and spring arrangement. The lever in effect moves the centre line of the actuator to allow a short-travel switch contact to be located to one side of the centre line of the long-travel keytop. A spring is used to cause the short-travel contact to close at the centre of the travel of the keytop. Use of a lever also allows indicator lamps to be mounted close to the centre of travel, permitting closer centre-to-centre spacing between the lamp and the centre of the switch. Using a short-travel switch contact permits the height of the long-travel switch assembly to be reduced to a minimum while maintaining the long stroke.
- The present invention provides a long-stroke push-button switch assembly. The switch assembly comprises a housing supported on a base and depressible key means operatively associated with the housing and arranged for reciprocable travel relative to the housing. Normally-open short-stroke contact means are provided below the base, with the axis of movement of the contact means being parallel to but spaced from the axis of movement of the key means. A lever means is pivotably mounted relative to the housing and operatively associated with the contact means for closing the contact means when the key means is depressed. A spring means interconnects the key means and the lever means. The spring means has a stiffness sufficient to overcome the resistance of the contact means so as to cause the lever means to pivot and close the contact means when the key means is at approximately the midpoint of its travel, but also has a resilience sufficient to allow the key means to complete the last half of the travel after the contacts have been closed.
- In order that the invention shall be fully understood, one preferred embodiment of switch in accordance with the invention will now be described by way of example and with reference to the accompanying drawings. In the drawings:
- Figure 1 is a perspective view of a switch assembly in accordance with the present invention.
- Figure 2 is an exploded view of the switch assembly shown in Figure 1, showing the interrelationship of the individual parts.
- Figure 3 is a sectional view taken along the line 3-3 of Figure 1.
- Figure 4 is a sectional view taken along the line 4-4 of Figure 3.
- Figure 5 is a sectional view taken along the line 5-5 of Figure 3, showing the switch in the normally-open position.
- Figure 6 is a sectional view taken along the line 5-5 of Figure 3, showing the switch in the fully- depressed position.
- Referring now to the drawings, wherein like numerals indicate like elements, there is shown in Figure 1 a long-stroke push-
button switch assembly 10 in accordance with the present invention. Theswitch 10 includes akeytop 12 actuated by the user's finger. Thekeytop 12 may be made of a clear or translucent polycarbonate material. Thekeytop 12 has alegend area 14 surmounted by alegend cap 16. Thelegend cap 16 is preferably made of a clear acrylic material. Thelegend surface 14 may be used to display a graphic or printed legend to the user. Thelegend cap 16 snap fits on to thekeytop 12 via a pair of mating structures comprising arecess 18 in thekeytop 12 and aprojection 20 on the inner surface of thelegend cap 16, see Figure 2. - The
keytop 12 is arranged for reciprocal travel relative to ahousing 22. As best seen in Figures 2 to 4, thekeytop 12 is substantially in the shape of an inverted hollow cube open at one end. Thekeytop 12 thus fits over thehousing 22, and moves reciprocally with respect to the housing. - The
switch 10 further comprises thehousing 22 which includes a base 24. Integral with the base 24 are a plurality offeet 26 which rest on the surface of a printed circuit board. Two locatingpins 28 depend downwardly beneath diagonallyopposite feet 26 and serve to locate and attach theswitch 10 in proper registry with a mounting surface. - As best seen in Figure 2, the
switch 10 includes aninsert 30 located within thekeytop 12. Theinsert 30 carries twolight pipes 32 which serve to conduct light from an illuminating lamp or lamps 34 (see Figures 5 and 6) to thekeytop 12. Thelight pipes 32 are preferably made of the same clear acrylic material from which the legend cap is made. Theinsert 30 has a downwardly projectingpost 36 which secures one end of acoil spring 38. The other end of thecoil spring 38 is secured in acavity 40 within thehousing 22. Alever 42 is pivotably mounted at one end in thehousing 22, see Figures 5 and 6. Theilluminating lamps 34 are located withinrespective cavities 44 in thehousing 22. - The
keytop 12 is retained on thehousing 22 by retainingpawls retaining pawls stops openings keytop 12. Theretaining pawls keytop 12 can simply be snapped on to the'housing 22. The stops 50 and 52 limit upward movement of thekeytop 12. Downward movement of thekeytop 12 is limited by contact between the sides of thekeytop 12 and the top of the base 24. Thekeytop 12 has a plurality ofinternal ribs elongated slots housing 22. The ribs and slots serve as guides to constrain movement of thekeytop 12 to linear reciprocal movement. - As best seen in Figures 5 and 6, the
light pipes 32 are each retained in theinsert 30 by aretaining finger 70, which snaps into an opening 72 in theinsert 30. Eachlight pipe 32 extends downwardly through thecavity 44 in theinsert 30 and is substantially coaxial with itslamp 34. A pair of leads 74 supply electric current to thelamp 34. - Figures 5 and 6 show the
switch 10 mounted on a printed circuit board 76. PC board 76 is provided with openings (not numbered) for receiving the locatingpins 28. The locatingpins 28 serve properly to position theswitch 10 over the normally open switch contacts. The switch contacts may comprise any short-stroke set of contacts, such as snap-dome, membrane or other short-stroke contacts. For the purpose of illustrating this preferred embodiment of the invention, theswitch 10 is shown with short-stroke contacts in the form of a snap-dome 78 and a printedcontact 80 on PC board 76. Snap-dome switches are well-known and need not be described in detail here. Thefeet 26 space theswitch 10 above the PC board 76, and define aspace 82 surrounding theswitch contacts - The
lever 42 has a downwardly-projectingactuator 84 which rests lightly upon the snap-dome contact 78 when theswitch 10 is in the normally-open position, as shown in Figure 5. Thelever 42 is provided with astop surface 86 which coacts with astop surface 88 in thehousing 22 to limit downward movement of thelever 42 when theswitch 10 is depressed. Thelever 42 also has ashort post 90 on its upper surface to position the lower end of thespring 38.Trunnions 92 pivotably secure thelever 42 to thehousing 22. - The operation of the switch will now be described with particular reference to Figures 5 and 6. Figure 5 is a sectional elevation of the switch in the normally-open position. The
spring 38 is mildly compressed and thekeytop 12 is urged by thespring 38 to its highest position. The snap-dome 78 is in the normally-open position, and supports thelever 42 via thelever actuator 84 at a position inclined slightly above the horizontal. - As the
keytop 12 is depressed, thespring 38 is compressed further. Thespring 38 is stiff enough so that, when thekeytop 12 is at approximately the midpoint of its travel, thespring 38 is only partially compressed and the force with which thekeytop 12 is depressed is transmitted through thespring 38 to thelever 42. The mechanical resistance of the snap-dome contact 78 is overcome by the force depressing thekeytop 12, and thelever 42 pivots clockwise as viewed in Figure 5 and presses the snap-dome contact 78 down to bring it into contact with the printedcontact 80, thereby closing the switch contacts. - Further pressure on the
keytop 12 continues to compress thespring 38 until the spring is still further compressed, as shown in Figure 6. Thus, thekeytop 12 continues to move downward under finger pressure after thecontacts keytop 12 is released, thespring 38 expands, returning thekeytop 12 to its initial position, allowing thelever 42 to pivotcounter- clockwise as viewed in Figure 5. As the lever 42pivots counter-clockwise, the snap-dome contact 78, because of its inherent resilience, returns to the normally-open position. - It will be appreciated that the switch of the present invention achieves the objects set forth above in a unique and non-obvious manner.
- It will also be appreciated that the present invention can be used easily to convert any conventional short-stroke switch into a long-stroke switch by locating the
switch 10 over any conventional short-stroke switch.
Claims (9)
1. A long-stroke push-button switch assembly, comprising:
(a) a housing (22) supported on a base (24),
(b) depressible key means (12) operatively associated with the housing and arranged for reciprocable travel relative thereto,
(c) normally-open short-stroke contact means (78,80) below the base (24), the axis of movement of the contact means being parallel to but spaced from the axis of movement of the key means,
(d) lever means (42) pivotably mounted relative to the housing and operatively associated with the contact means for closing the contact means (78,80) when the key means (12) is depressed, and
(e) spring means (38) interconnecting the key means (12) and the lever means (42), the spring means having a stiffness sufficient to overcome the resistance of the contact means so as to cause the lever means to pivot and close the contact means when the key means is at approximately the midpoint of its travel but having a resilience sufficient to allow the key means to complete the last half of the travel after the contacts have been closed.
2. A switch according to claim 1, characterised by means (34,32) for illuminating the key means (12) after the switch contact means (78,80) have been closed.
3. A switch according to claim 1 or 2, characterised by means (14) for displaying a legend on its upper surface.
4. A switch according to claim 1, 2 or 3, characterised in that said housing (22) includes a plurality of spacer means (26) integral with the base (24) for locating the base a fixed distance above the contact means.
5. A switch according to claim 4, characterised by further means (28) integral with the base (24) for locating and mounting the switch in registry with a switch mounting surface.
6. A switch according to claim 5, characterised in that said locating and mounting means comprise downwardly projecting pins (28) on at least two of the spaced means (26).
7. A switch according to any preceding claim, characterised in that the spring means comprises a cylindrical coil spring (38).
8. A switch according to any preceding claim, characterised in that the contact means comprise a snap-dome switch (78,80).
9. A switch according to any of claims 1 to 7, characterised in that the contact means comprise a membrane switch.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US59449284A | 1984-03-29 | 1984-03-29 | |
US594492 | 1984-03-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0157037A2 true EP0157037A2 (en) | 1985-10-09 |
EP0157037A3 EP0157037A3 (en) | 1986-11-05 |
Family
ID=24379099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84306247A Withdrawn EP0157037A3 (en) | 1984-03-29 | 1984-09-12 | Long-stroke push-button switch |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0157037A3 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0562389A1 (en) * | 1992-03-24 | 1993-09-29 | SCHURTER GmbH | Stroke lengthening element for foil keyboards |
EP0887819A2 (en) * | 1997-06-23 | 1998-12-30 | Eaton Corporation | Electric push-button switch |
EP1004462A1 (en) * | 1998-11-21 | 2000-05-31 | Preh-Werke GmbH & Co. KG | Operating keypad, especially for vehicle air conditioning system |
US7651232B2 (en) * | 2002-12-02 | 2010-01-26 | Bsh Bosch Und Siemens Haugeraete Gmbh | Domestic appliance and switch for application in a domestic appliance |
US8536168B2 (en) | 2007-03-15 | 2013-09-17 | Novartis Ag | Benzyl and pyridinyl derivatives as modulators of the hedgehog signaling pathway |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3648394A (en) * | 1970-01-12 | 1972-03-14 | Burroughs Corp | Keytop structure |
US3749859A (en) * | 1972-04-19 | 1973-07-31 | Colorado Instr Inc | Keyboard switch assembly with improved hermetically sealed diaphragm contact structure |
US3916150A (en) * | 1974-03-04 | 1975-10-28 | Stackpole Component Co | Data machine keyboard assembly with elongated key cap for actuating an electric switch |
EP0118131A2 (en) * | 1983-03-07 | 1984-09-12 | Oak Industries Inc. | Tactile feel switch with positive switch actuation |
-
1984
- 1984-09-12 EP EP84306247A patent/EP0157037A3/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3648394A (en) * | 1970-01-12 | 1972-03-14 | Burroughs Corp | Keytop structure |
US3749859A (en) * | 1972-04-19 | 1973-07-31 | Colorado Instr Inc | Keyboard switch assembly with improved hermetically sealed diaphragm contact structure |
US3916150A (en) * | 1974-03-04 | 1975-10-28 | Stackpole Component Co | Data machine keyboard assembly with elongated key cap for actuating an electric switch |
EP0118131A2 (en) * | 1983-03-07 | 1984-09-12 | Oak Industries Inc. | Tactile feel switch with positive switch actuation |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0562389A1 (en) * | 1992-03-24 | 1993-09-29 | SCHURTER GmbH | Stroke lengthening element for foil keyboards |
EP0887819A2 (en) * | 1997-06-23 | 1998-12-30 | Eaton Corporation | Electric push-button switch |
EP0887819A3 (en) * | 1997-06-23 | 1999-06-09 | Eaton Corporation | Electric push-button switch |
EP1004462A1 (en) * | 1998-11-21 | 2000-05-31 | Preh-Werke GmbH & Co. KG | Operating keypad, especially for vehicle air conditioning system |
US6180904B1 (en) | 1998-11-21 | 2001-01-30 | Preh-Werke Gmbh & Co. Kg | Activation keyboard, particularly for motor-vehicle climate controls |
US7651232B2 (en) * | 2002-12-02 | 2010-01-26 | Bsh Bosch Und Siemens Haugeraete Gmbh | Domestic appliance and switch for application in a domestic appliance |
DE10256171B4 (en) * | 2002-12-02 | 2012-04-26 | BSH Bosch und Siemens Hausgeräte GmbH | Household appliance and switch for use in a household appliance |
US8536168B2 (en) | 2007-03-15 | 2013-09-17 | Novartis Ag | Benzyl and pyridinyl derivatives as modulators of the hedgehog signaling pathway |
Also Published As
Publication number | Publication date |
---|---|
EP0157037A3 (en) | 1986-11-05 |
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18D | Application deemed to be withdrawn |
Effective date: 19861001 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: GILBERT, JAMES C. |