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US 4,055,141 AGranted
Transparent dial and outer transparent cover for scale with zero-setting adjustment
OwnerDouglas M. Homsinventor
Life of this patent
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OwnerDouglas M. Homsinventor
Estimating the term…
For dial scales, scale graduations are displayed on a transparent dial which fits in front of the pointer. The dial has a flange which fits over the circular flange of the metal pan behind the dial. The transparent dial may be removed and interchanged and twisted relative to the pointer for zero-adjustment or tare adjustment. The dial may have various types of graduations. In one modification the pan is blank and all graduations are on the twistable transparent dial. In another modification the pan dial is marked in normal fashion; the transparent dial has one or several "under-over" markings which can be aligned with the pan marking for the desired average weight. To adjust the metal pan so that it is centered relative to the pointer staff, a template is used which fits accurately relative to the flange of the pan. A plug in the center of the template receives the staff. The screws which fasten the pan to its mounting bracket may be tightened through openings in the template.
A scale dial-cover combination comprising a transparent circular cover having a flat circular face and cylindrical peripheral first flange, a scale pan having a cylindrical peripheral second flange shaped to engage said first flange, said circular face marked with scale dial markings, said flanges fitting over each other with a slip fit to permit rotation of said cover about the central axis of said pan and to permit said cover to be slipped off said second flange for replacement with a different face, a scale frame bracket, said pan being apertured, attachment means for securing said pan to said bracket, a pointer staff extending through said pan, and a pointer on said staff a short distance behind said face, said pan being formed with enlarged holes and said bracket with tapped holes, screws fitting with play through said enlarged holes and into said tapped holes, to adjust and fix the position of said pan relative to said bracket with said second flange centered relative to said staff.
A scale dial-cover combination comprising a transparent circular cover having a flat circular face and cylindrical peripheral first flange, a scale pan having a cylindrical peripheral second flange shaped to engage said first flange, said flanges fitting over each other with a slip fit to permit rotation of said cover about the central axis of said pan and to permit said cover to be slipped off said second flange for replacement with a different face, a pointer rotatable concentric with said flanges, said pan being marked with weight markings and said face with under-over markings having a center line and marks to either side of said center line equally spaced from said center line a distance which is a multiple of one weight marking on said pan, whereby said cover may be turned so that said center line is aligned with a weight marking on said pan, said marks indicating that the weight imposed on said scale is within the under-over limits of said weight marking when said pointer is between said marks.
Dependencies are inferred from the claim text.