Calibration device for a helical spring scale

Details Calibration device for a helical spring scale Calibration device for a helical spring scale

2006-03-07

2006-03-07

Gibson, Randy W. (Department: 2841)

Weighing scales

Self-positioning

Spring

C177S225000, C177S233000, C073S001130

Reexamination Certificate

active

07009120

ABSTRACT:
A scale includes a housing, a first pressing element, a second pressing element, an adjusting unit, a spring, a carrying unit and an indicator. The housing includes a graduation provided thereon and has a lower portion. The adjusting unit is secured to the lower portion of the housing and has a first thread. The first pressing element is slidably secured in said housing and has a second thread engaged with the first thread of said adjusting unit. The adjusting unit can be rotated relative to the first pressing element for moving the first pressing element in the housing in the direction where the spring can be compressed. The second pressing element is slidably received in the housing. The spring is received in the housing and between the first and second pressing elements. The carrying unit is suited for carrying an object to be weighed and is engaged with the second pressing element. The indicator is moved in concert with the second pressing element for aligning with the graduation and for indicating the weight of the object.

REFERENCES:
patent: 452278 (1891-05-01), McIlvane
patent: 2446720 (1948-08-01), Rominski
patent: 3022845 (1962-02-01), Provi
patent: 4078625 (1978-03-01), Loeb
patent: 4785891 (1988-11-01), Noland
patent: 4964479 (1990-10-01), Sumida
patent: 6246017 (2001-06-01), Yang
patent: 6649850 (2003-11-01), Strohmeier

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