Browse Prior Art Database

Elapsed Time Signaling Devices

IP.com Disclosure Number: IPCOM000082918D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 3 page(s) / 45K

Publishing Venue

IBM

Related People

Bakis, R: AUTHOR [+2]

Abstract

An expense for supporting intermittently used equipment remote from repair personnel, involves sending repairmen for preventive maintenance after a specified number of operating hours of the unit. Typical units include, electric typewriters and computer terminals. It is difficult to predict the actual number of operating hours per month, and so money is wasted on maintenance done based on the maximum possible number of operating hours per month, not the actual. This small, reliable, inexpensive component signals when a certain number of operating hours accumulates.

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Elapsed Time Signaling Devices

An expense for supporting intermittently used equipment remote from repair personnel, involves sending repairmen for preventive maintenance after a specified number of operating hours of the unit. Typical units include, electric typewriters and computer terminals. It is difficult to predict the actual number of operating hours per month, and so money is wasted on maintenance done based on the maximum possible number of operating hours per month, not the actual. This small, reliable, inexpensive component signals when a certain number of operating hours accumulates.

A device currently available on the commercial market and widely used and shown in Fig. 1 is used on typewriters and terminals. It uses a chemical process that goes when power is turned on at the unit. As running time elapses, an electrolyte boundary gap 11 between two liquid electrodes slowly migrates. This provides only a passive indication, so the user or the repairman must look at the component to observe its status. A solution is an obvious active device that will turn on a lamp or operate an audible signal.

The device of Fig. 2 is an adaptation of the timer of Fig. 1. Two segments 8 and 9 of liquid electrode material colored red lie inside a capillary tube 10, and are separated by gap 11. An operating time elapses, gap 11 moves steadily from one electrode to the other as material moves from one segment 8 or 9 and is deposited onto the other. Electrodes 14 and 15 connect power to segments 8 and 9, respectively.

Contacts 16 and 17 attach into the capillary column perpendicularly at the two points indicated. A neon lamp 18 is connected to one contact 17. When gap 11 migrates to the position of contact 17, the neon lamp 18 is lit, and since the maintaining voltage required is lower than the striking voltage, lamp 18 stays lit. The device is reusable by simply reversing tube 10 so contact 16 now connects to lamp 18. Renewability by simply rotating the element 180 Degrees is a feature of the unit...