Browse Prior Art Database

SOLENOID ACTIVATED SPRING TRIP ALERT

IP.com Disclosure Number: IPCOM000006065D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Nov-29
Document File: 1 page(s) / 60K

Publishing Venue

Motorola

Related People

Doug Ayerst: AUTHOR [+2]

Abstract

Miniaturization of the personal paging device to a size that may be incorporated within a wrist watch requires a reduction in battery size. This results in a reduction of available power to the device. The standard motor and beeper alerts draw a significant amount of current when in use. There is a need to reduce this drain so that the battery life may be extended as much as possible.

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MOTOROLA INC. Technical Developments Volume 12 April 1991

SOLENOID ACTIVATED SPRING TRIP ALERT

by Doug Ayerst and Clinton Powell

  Miniaturization of the personal paging device to a size that may be incorporated within a wrist watch requires a reduction in battery size. This results in a reduction of available power to the device. The standard motor and beeper alerts draw a significant amount of current when in use. There is a need to reduce this drain so that the battery life may be extended as much as possible.

  The spring trip alert uses stored mechanical energy combined with a small amount of energy provided by the battery which is used to activate an electrical solenoid. The alert arm method requires that only a short duration of current need be applied to the solenoid once for each page received. This momentary draw of current allows for a significant savings in current drain over that of a vibrating motor or tone alert which runs continuously (and periodically) until interrupted by the wearer.

The device combines a solenoid with a mechanical lever and springs to provide the watch

pager wearer with a non-audible alert. In figure 1 we see the side and front views of the device. At rest one arm of the lever is held against the solenoid by a spring. The solenoid is relaxed (disengaged). This causes the other arm of the lever to be engaged in the alert arm holding it in a position parallel to the side of the watch. When a page is received the solenoid is activ...