Scale

• US 4,744,428 A
• Filed: 09/29/1986
• Issued: 05/17/1988
• Est. Priority Date: 09/29/1986
• Status: Expired due to Term

• Current Assignee: Deering Precision Instruments LLC
• Original Assignee: David G. Knotter, Donald R. Levin, Numbers JODY L
• Inventors: Levin, Donald R., Numbers, Jody L., Knotter, David G.
• Primary Examiner(s): MILLER JR, GEORGE
• Application Number:
  US06/912,912
• Time in Patent Office: 596 Days
• Field of Search: 177/127, 177/165, 177/247, 177/252, 177/DIG. 9
• US Class Current: 177/127
• CPC Class Codes: G01G 1/36 wherein the counterweights are slideable along the beam, e.g. steelyards
• CPC Class Codes: G01G 21/28 Frames, Housings
• CPC Class Codes: Y10S 177/09 Scale bearings

Abstract

A scale small enough and light enough to be carried in a person'"'"'s pocket by virtue of the fact that most of its components are formed of lightweight molded plastic material. The fulcrum for the beam of the scale is provided by a pair of pointed, metal fulcrum posts adapted to cooperate with a pair of metal bearing inserts in the beam. A sliding weight which is movable along the beam has a metal insert to increase its weight and the metal insert is positioned in the plane of the fulcrum when the sliding weight is in its zero position.

Claims

1. A lightweight portable scale comprising a base, a beam having a substance holder at one end thereof and a scale extending toward the opposite end thereof, a sliding weight movably carried by said beam for movement along said scale, a pair of metallic fulcrum posts projecting upwardly from said base, and a pair of metallic bearing inserts in said beam for cooperation with said fulcrum posts, one pair of the pair of posts or the pair of inserts having pointed projections thereon receivable in tapered recesses in the other pair for positioning and pivotally supporting said beam, said sliding weight being movable from a zero position to a position near the said opposite end of the beam and said sliding weight when in its zero position having a portion thereof disposed substantially in an imaginary plane containing the fulcrum of the beam, whereby to minimize the weight of the substance holder required to balance the beam when the sliding weight is in its zero position.

2. The portable scale of claim 1 further characterized in that said sliding weight is formed of molded plastic material and has a metallic insert therein in the portion thereof which can be positioned in the plane containing the fulcrum.

3. A lightweight portable scale comprising a base, a beam having a substance holder at one end thereof and a scale extending toward the opposite end thereof, means providing a fulcrum for said beam, and a sliding weight carried by said beam for movement along said scale from a zero position to a position near the opposite end of the beam, said base being provided by the lwoer portion of a two-part case having upper and lower portions adapted to contain said beam and said substance holder when said beam is positioned on said fulcrum means, said case having a generally rectangular configuration with one corner region thereof chopped off and the upper and lower portions of the case having separating tabs projecting therefrom in said one corner region.

4. A lightweight portable scale comprising a base, a beam having a substance holder at one end thereof and a scale extending toward the opposite end thereof, means providing a fulcrum for said beam, and a sliding weight carried by said beam for movement along said scale from a zero position to a position near the said opposite end of the beam, said sliding weight when in its zero position having a portion thereof disposed substantially in an imaginary plane containing the fulcrum of the beam whereby to minimize the weight of the substance holder required to balance the beam when the sliding weight is in its zero position.

5. The portable scale of claim 4 further characterized in that said sliding weight is formed of molded plastic material and has a metallic insert therein in the portion thereof which can be positioned in the plane containing the fulcrum.