Browse Prior Art Database

Two Level Pushbutton Switch

IP.com Disclosure Number: IPCOM000084180D
Original Publication Date: 1975-Oct-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Esham, NR: AUTHOR

Abstract

In pushbutton switch assembly 1 shown in Figs. 1, 3, and 4, a first set of contacts is engaged by partial depression of the switch plunger and a second set of contacts is engaged by full depression of the switch plunger. Upon depression of the plunger from the partially depressed to the fully depressed position, the first set of contacts is disengaged. Release of the plunger disengages the second set of contacts and does not reengage the first set of contacts, as the plunger returns to the fully undepressed position.

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Two Level Pushbutton Switch

In pushbutton switch assembly 1 shown in Figs. 1, 3, and 4, a first set of contacts is engaged by partial depression of the switch plunger and a second set of contacts is engaged by full depression of the switch plunger. Upon depression of the plunger from the partially depressed to the fully depressed position, the first set of contacts is disengaged. Release of the plunger disengages the second set of contacts and does not reengage the first set of contacts, as the plunger returns to the fully undepressed position.

Referring to Figs. 1 and 3, switch assembly 1 includes plunger 2 having a protrusion 3 engageable with cam arm 4. During partial depression of plunger 2, the engagement of protrusion 3 and cam surface 5 of arm 4 causes arm 4 to contact arm 7 for engaging the contacts of switch 8, as shown in Fig. 3. This downward movement of plunger 2 is against the bias of spring 9 that is compressed between stop 10 on plunger 2 and yoke 11 at the lower end of arm
4.

Further downward movement of plunger 2 compresses spring 15 between stop 13 on plunger 2 and plate 14. When plunger 2 is depressed to its most downward position as shown in Fig. 4, protrusion 3 moves beyond the end of cam surface 5 of arm 4 which allows the lower surface of yoke 11 to be rotated against plate 12. This brings arm 4 out of contact with arm 7 of switch 8 and disengages the contacts of switch 8. At this time plunger 2 engages switch 17 by movement of plunger 2 in...