Browse Prior Art Database

Universal Margin Rack

IP.com Disclosure Number: IPCOM000090504D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Mott, WE: AUTHOR

Abstract

A margin rack is provided for variable pitch escapement typewriters which separates the positioning devices from the locking devices for the margin stop. Rectangular metal slider bar 11 has mounted on it positioning plate 13 and sliding carriage 15. Plate 13 contains two sets of slots 17 and 19. These slots are spaced in accordance with the two pitches of the escapement rack. Shield 21 is pivotally secured to slide bar 11 at 23 and is adapted to be pivoted by arm 25 so that it masks either set of slots 17 and 19.

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Universal Margin Rack

A margin rack is provided for variable pitch escapement typewriters which separates the positioning devices from the locking devices for the margin stop. Rectangular metal slider bar 11 has mounted on it positioning plate 13 and sliding carriage 15. Plate 13 contains two sets of slots 17 and 19. These slots are spaced in accordance with the two pitches of the escapement rack. Shield 21 is pivotally secured to slide bar 11 at 23 and is adapted to be pivoted by arm 25 so that it masks either set of slots 17 and 19.

Margin set lever 27 is pivotally connected to plate 29 by pins 31 passing through holes 32. Lever 27 has spring detent 33 whose two prongs 35 and 37 detent in either slots 17 or 19 depending upon which set is masked by shield 21. Plate 29 rides on carriage 15 with handle portion 28 of lever 27 extending under and to the right of plate 13. Lever 27 is mounted to slide relative to carriage 15 in a direction perpendicular to bar 11 so that detent 33 is freed from slots 17 and 19 by moving lever 27 to the left. Cam lock 39 is pivotally connected to plate 29 and carriage 15 by pin 41 and has locking lever 45 with a cam spring lock portion 47. Restoring spring 49, connected between lever 27 and carriage 15, urges lever 27 and thus plate 29 and lock 39 toward bar 11 such that lock 39 contacts vertical surface 51 of bar 11.

In operation, lever 27 is first pushed in to free detent 33 and then carriage 15 is slid along bar 11 to the position...