Browse Prior Art Database

Tape File Protection Mechanism

IP.com Disclosure Number: IPCOM000074132D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 3 page(s) / 67K

Publishing Venue

IBM

Related People

Schwomeyer, WA: AUTHOR

Abstract

This frontal access tape file mechanism provides a means for changing and/or visually observing the file protection status of a magnetic tape reel without the necessity of removing the tape from the tape drive.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 52% of the total text.

Page 1 of 3

Tape File Protection Mechanism

This frontal access tape file mechanism provides a means for changing and/or visually observing the file protection status of a magnetic tape reel without the necessity of removing the tape from the tape drive.

Tape reel 10 shown in the exploded partial view has an inner hub 11 which attaches to the tape drive, not shown. Concentrically mounted to hub 11 is outer hub 12. The magnetic tape, not shown, is wound on the outside surface of vertical wall 13 located between flanges 14 and 15. A window 16 is provided in the frontal flange 14, between hub 11 and wall 13. On the inner surface of wall 13, a recess 17 is provided having upper and lower lug pockets 18 and 19, respectively.

An annular ring 20 slidably fits into the hollow recess 21 formed between hubs 11 and 12. A compatibly configured radial lug, not shown, is affixed to ring 20, and is selectively engagable with the pockets 18 and 19. The radial lug, not shown, is similar to its diametrically opposed mate 22. Also mounted on the ring 20 is an upwardly extending lug 23. Lug 23 has upper and lower faces 24 and 25, respectively. A finger depression pocket 26 is provided on face 24 and is radially and symmetrically aligned with the aforementioned radial lug, not shown. Lug 23 is slidably engaged in a compatibly configured groove 23A - 23B, which is formed in the under surface 27 of frontal flange 14. The groove is concentrically aligned with window 16 and is concentrically extended on both sides of the window 16.

A spring member 28 which has an annular ring configuration is fitted into the recess formed by the inverted L-shaped groove 29 of member 20 and lower inner vertical surface 30 of wall 13. When assembled, member 20 is concentrically and slidably mounted about hub 11. Outer flange 15, which is affixed to hub 12 by suitable means such as screws, for example, threaded into wall 13, is in turn concentrically mounted about the vertical portion of the inverted L-shaped groove 29 such that the vertical portion is slidable within the spacing between hub 11 and flange 15. As a result, the rear flange 15 compresses the spring 28 upwardly so that the surfaces 31, 32 and 33 of member 20 bear against the outer surface of hub 11, surfaces 27 and 30 of member 12, respectively, when lug 22 is in upper pocket 18 of recess 17 and lug 23 is in the afore...