Back incline indicator

Details Back incline indicator Back incline indicator

1989-05-05

1990-09-18

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

272DIG5, 340573, 434247, G08B 2100

Patent

active

049581457

ABSTRACT:
A back incline indicator (10) employs a mercury switch (44) and a beeper (72) to indicate to a user (24) whenever the back of the user (24) is bent beyond an acceptable limit, .lambda.crit. The mercury switch (44) and beeper (72) are attached to a casing (38) including a plate (28A) that is parallel to the back of the user (24). The casing (38) is connected by a connector (14) to the shirt collar of the user (24). The mercury switch (44) is set to an angle .theta. from the plate (28A). The value of .theta. determines how much the user's back may be bent before .lambda.crit is reached. The value of .theta. may be set to different amounts as the desired value of .lambda.crit may vary with different uses of the back incline indicator (10).

REFERENCES:
patent: 3362023 (1965-06-01), McMahon
patent: 3582935 (1971-06-01), Verhaeghe
patent: 3644919 (1972-02-01), Mathauser
patent: 4284986 (1981-08-01), Amortegui
patent: 4536755 (1985-08-01), Holzgang et al.
patent: 4665388 (1987-05-01), Ivie et al.
patent: 4829285 (1989-05-01), Brand et al.
Creative Specialists Brochure for Back Box II Lift Angle Sensor.

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