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Browse Prior Art Database

Over-Center Cash Drawer Latch

IP.com Disclosure Number: IPCOM000102220D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Harris, RH: AUTHOR [+2]

Abstract

Disclosed is a device that latches a point-of-sale cash drawer. The device is inexpensive and highly reliable. It virtually eliminates sliding friction in the latch mechanism.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Over-Center Cash Drawer Latch

       Disclosed is a device that latches a point-of-sale cash
drawer.  The device is inexpensive and highly reliable.  It virtually
eliminates sliding friction in the latch mechanism.

      Currently cash drawer latches use two surfaces that slide on
each other until their contact area is reduced to zero, which is when
unlatching occurs.  The level of stress in the contact area increases
as the area is reduced and approaches very high levels at unlatch.
High stresses cause wear, and wear increases the coefficient of
friction between the latch surfaces.  Variations in the coefficient
of friction cause this method of latching to have reliability
problems.

      The device consists of a drawer lever which pivotally attaches
to the drawer at the drawer pivot and pivotally attaches to the frame
lever.  A solenoid is shown which pushes the drawer lever clockwise
about the drawer pivot. The drawer pivot moves with the drawer.  An
optical sensor is shown which signals the terminal system that the
drawer is in the latched position.  The lock latch and open cam also
use detail on the drawer lever to either prevent its clockwise
movement (lock) or to cause clockwise movement (open the drawer).
The frame lever pivotally attaches to the drawer lever and to the
frame at the frame pivot which does not move.  The clockwise rotation
of the frame lever is limited by the stop which is part of the frame.
The torsion spring provides a small clockwise torque to the fr...