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Selection Lever Bail Adjustable

IP.com Disclosure Number: IPCOM000048403D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Dials, EN: AUTHOR [+2]

Abstract

In typewriters, cam driven bails are used to reset latches and spring catches and are typically driven by eccentric shaft-rotated single lobe cams.

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Selection Lever Bail Adjustable

In typewriters, cam driven bails are used to reset latches and spring catches and are typically driven by eccentric shaft-rotated single lobe cams.

One technique for fabricating a bail which is relatively inexpensive is to stamp and form the bail, such as that illustrated in Fig. 1. Bail 10 is formed with a lever arm 12 and a cam follower arm 14 and cam follower tip 16. This arrangement allows the appropriate movement of the bail about pivot segment 18 upon the rotation of the cam. The problem with this particular type of forming is that it requires adjustment by hand, which is imprecise, by bending and forming the bail with hand tools after assembly.

An alternative to the hand forming and adjustment of the cam follower arm portion of the bail is illustrated in Fig. 2. Again, bail 10 is provided with a lever arm 12 and pivot segment 14. Rather than forming the remaining portion of the bail into a cam follower arm, such as found in Fig. 1, a bend is formed into the bail in a less precise manner to form a pivot axis 20. Cam follower tip 22 is provided with holes 24 to accommodate pivot section 20. Upper follower tip 26 extends to the follower arm 28. Also included is a threaded hole 30 to accept adjustment screw 32. Adjustment screw 32 carries lock nut 34 to prevent the adjustment from vibrating loose at a later time. The bottom end of adjustment screw 32 rests on the upper portion of pivot arm 14 and thus the follower tip 26 and arm...