Browse Prior Art Database

Pneumatic Door Latch Release

IP.com Disclosure Number: IPCOM000077284D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Hollingsworth, RG: AUTHOR [+2]

Abstract

Most door latch release mechanisms operated by a coded badge comprise electrically-operated solenoids or catch mechanism, which is subject to failure by either the elements or an over enthusiastic user. The pneumatic door latch release illustrated in the drawing is of simple construction and yet rugged enough to withstand severe use while being self-cleaning, which prevents jamming of the mechanism even during severe inclement conditions.

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Pneumatic Door Latch Release

Most door latch release mechanisms operated by a coded badge comprise electrically-operated solenoids or catch mechanism, which is subject to failure by either the elements or an over enthusiastic user. The pneumatic door latch release illustrated in the drawing is of simple construction and yet rugged enough to withstand severe use while being self-cleaning, which prevents jamming of the mechanism even during severe inclement conditions.

Referring to the sketch, a cylinder block 10 includes a cylindrical chamber 11 in which is mounted for reciprocation a piston 12, the piston being of a rather loose fit relative to the chamber 11. The cylinder block is connected to a striker plate 13 which is in turn connected to the door jamb 14. Connection of the cylinder block 10 to the striker plate 13 is by pins 15A, 15B, which pass through and act as guides for a ram 16 connected to the piston 12. The ram 16 includes apertures 16A, 16B which loosely register with the pins 15A, 15B, respectively. The striker plate 13 includes the conventional latch receiving opening 17 to receive the latch 15 mounted along the jamb edge of a door 19. As shown, the ram 16 may include an extension 16C dimensioned for registration with the opening 17.

The chamber 11 includes an aperture 11A into which air may enter the chamber 11 through fluid piping 20. Air may enter the fluid piping 20 when a coded badge or the like operates an air solenoid to permit the entry of...