US 4,300,645 AGranted

Weighing scale for small loads

OwnerEugene L. Sly, David C. Englishinventors

Life of this patent

Estimating the term…

Loading patent…

Abstract

An elongated bending beam and an elongated flexure strap are supported in substantially parallel, spaced-apart relationship by end cantilever blocks one of which is secured to a scale base and the other of which mounts a food receiving platform for movement vertically with respect to the scale base. First and second pairs of matched strain sensing resistors are bonded to the opposite faces of the bending beam adjacent the opposite ends thereof and are connected electrically to form a balanced Wheatstone bridge, the output voltage of which is utilized to operate a digital read-out unit for indicating the weight of a small portion of sliced food deposited upon the scale platform from a food slicer, and is also utilized to turn off the food slicer when the desired weight of food is deposited on the scale platform.

Claims8

Dependent claims

A load weighing scale comprising:

(a) an elongated bending beam,
(b) an elongated flexure strap,
(c) a pair of horizontally spaced apart cantilever blocks secured to the opposite ends of the bending beam and flexure strap and supporting said beam and strap in vertically spaced-apart relationship,
(d) first and second pairs of substantially matched strain sensing resistors bonded to the opposite faces of the bending beam adjacent the opposite ends of the beam and connected together electrically to form a balanced Wheatstone bridge,
(e) a scale base member,
(f) a scale load receiving member,
(g) means for securing one of the cantilever blocks to the base member with the bending beam and flexure strap extending angularly upward therefrom, and
(h) means for securing the other cantilever block to the load receiving member for supporting the latter for movement toward and away from the base member.

5 more elements

Dependencies are inferred from the claim text.