Browse Prior Art Database

Reduced Noise Keybutton

IP.com Disclosure Number: IPCOM000034686D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Sonday, EJ: AUTHOR

Abstract

A typewriter key is provided which minimizes noise created at both the "make" position of the keystroke and also at "upstopping" when the upward or return movement of the keybutton is stopped. A typewriter key assembly is shown in Figs. 1 and 3 in the upstroke or return position and in Fig. 2 in the make position. The key assembly includes a stem 10 having a pair of oppositely disposed side legs 12 and a cantilever member 14 as can be best seen in Figs. 3 and 4. A buckling spring 16 is disposed within the stem 10 and is positioned to coact with the cantilever member 14. The legs 12 each have a stop member 20 on the outer side thereof with each stop member being provided with a tapered upper surface 22.

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Reduced Noise Keybutton

A typewriter key is provided which minimizes noise created at both the "make" position of the keystroke and also at "upstopping" when the upward or return movement of the keybutton is stopped. A typewriter key assembly is shown in Figs. 1 and 3 in the upstroke or return position and in Fig. 2 in the make position. The key assembly includes a stem 10 having a pair of oppositely disposed side legs 12 and a cantilever member 14 as can be best seen in Figs. 3 and 4. A buckling spring 16 is disposed within the stem 10 and is positioned to coact with the cantilever member 14. The legs 12 each have a stop member 20 on the outer side thereof with each stop member being provided with a tapered upper surface 22. The upper surfaces 22 of the stop members 20 are positioned to coact with abutment surfaces 24 formed on the typewriter frame. When the key is depressed from the position shown in Figs. 1 and 3 to that shown in Fig. 2, the cantilever member 14 coacts with the spring 16 and the deflection or outward movement of the spring is slowed, causing a more gradual movement, thus preventing the spring from a rapid buckling and slamming into the keybutton ramp 18 and keyboard frame. This action will reduce the noise on the make stroke. Upon return of the key from the make position in Fig. 2 to the return or upstroke position in Figs. 1 and 3, the action of the abutment surfaces 24 against the angled surfaces 22 of the stop member 20 causes the dissipati...