Mass and force meter

• US 4,088,014 A
• Filed: 01/12/1976
• Issued: 05/09/1978
• Est. Priority Date: 01/14/1975
• Status: Expired due to Term

• Current Assignee: K-Tron Patent AG
• Original Assignee: Wirth Gallo & Company
• Inventors: Gallo, Mario, Wirth, Johannes, Wirth, Armin
• Primary Examiner(s): Goldstein, Herbert
• Application Number:
  US05/648,366
• Time in Patent Office: 848 Days
• Field of Search: 73/141 R, 73/141 A, 73/DIG. 1, 177/210 R, 177/210 FP
• US Class Current: 73/862.59
• CPC Class Codes: G01G 3/165 Constructional details
• CPC Class Codes: G01L 1/10 by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings using resistance strain gauges G01L1/22
• CPC Class Codes: Y10S 73/01 Vibration

Abstract

A mass and force meter comprising a frame, a load support, a digital evaluation and display device and two electrically-excited, transversely-vibrating, pre-tensioned strings each having one end fixed to the frame. The other ends of the strings are connected to a force distributor, and first and second transmission elements are provided for transmitting to the force distributor a pre-tensioning force and a force which depends on the load to be measured. One end of each of the transmission elements is fixed to the force distributor and the other ends are connected to the respective pre-tensioning and load forces. A guide member having one end connected to the frame and the other end connected to the force distributor acts together with the strings to guide the force distributor in a statically defined manner relative to the frame with respect to the pre-tensioning force and the force established by the load to be measured. Means are further provided for applying to the evaluation display device the resultant frequency variations caused by application of load to the strings thereby permitting measurement and display of the magnitude of the measured load.

Claims

1. A mass and force meter comprising

a frame,

a load support,

digital evaluation and display means mounted on said frame,

a force distributor,

first and second strings, each having one end attached to said force distributor at spaced apart locations,

a first transmission element attached to said force distributor, said first transmission element transmitting a pre-tensioning force to said force distributor for pre-tensioning said first and second strings,

a second transmission element attached to said force distributor for transmitting a force depending on the load placed on said meter, the longitudinal axes of said first and second strings and said first and second transmission elements not intersecting at a common point thereby distributing the forces exerted thereby over said force distributor, said strings vibrating transversely when electrically excited,

means for applying to the evaluation and display means resultant frequency variations caused by the application of said forces to said strings for computation and display of the magnitude of said load, and

a guide having one end connected to said frame and its other end connected to said force distributor, said guide and said strings guiding said force distributor in a statically defined way relative to said frame with respect to said pre-tensioning force and said force depending on the load to be measured.

2. A mass and force meter as defined by claim 1 wherein said first transmission element is attached to said force distributor at a location intermediate the points of attachment of said strings.

3. A mass and force meter as defined by claim 1 which further comprises a pre-loading mass for applying a force to said transmission element.

4. A mass and force meter as defined by claim 1 wherein the other ends of said first and second strings are attached to said frame.

5. A mass and force meter as defined by claim 1 wherein the other ends of said first and second strings are attached to said load support.

6. A mass and force meter as defined by claim 1 wherein said first transmission element comprises a lever attached to said load support and to said force distributor, the other ends of said strings being secured to said lever, said force distributor and frame being further provided with opposing knife edges separated by a support element.

7. A meter for measuring the mass of a load comprising

a frame,

a load support,

digital evaluation and display means mounted on said frame,

a force distributor,

first and second strings, each having one end attached to said frame and the other ends attached to said force distributor at spaced apart locations,

a preloading mass,

a first transmission element having one end attached to said preloading mass and the other end attached to said force distributor at a location intermediate the points of attachment of said strings,

a second transmission element having one end attached to said mass and the other end to said force distributor, the longitudinal axes of said first and second strings and said first and second transmission element not intersecting at a common point thereby distributing the forces exerted thereby over said force distributor, said strings vibrating transversely when electrically excited,

means for applying to the evaluation and display means resultant frequency variations caused by the application of said forces to said strings for computation and display of the magnitude of said load, and

a guide having one end connected to said frame and its other end connected to said force distributor, said guide and said strings guiding said force distributor in a statically defined way relative to said frame with respect to said pre-tensioning force and said force depending on the load to be measured.