Weight scale for a hydraulic loader and related method

• US 4,792,004 A
• Filed: 09/25/1987
• Issued: 12/20/1988
• Est. Priority Date: 09/25/1987
• Status: Expired due to Fees

• Current Assignee: Sheffield, Richard
• Original Assignee: Sheffield, Richard
• Inventors: Sheffield, Richard
• Primary Examiner(s): Miller, Jr., George H.
• Application Number:
  US07/101,362
• Time in Patent Office: 452 Days
• Field of Search: 177/141, 177/146, 177/208-209
• US Class Current: 177/141
• CPC Class Codes: E02F 9/264 Sensors and their calibration for indicating the position of the work tool
• CPC Class Codes: G01G 19/10 having fluid weight-sensitive devices

Abstract

A weight scale for a loader operated by a hydraulic system incorporated in equipment and a related method are provided. The scale includes a pressure gauge installed in a hydraulic line of the hydraulic system. The gauge may either be located at a loader boom or the tractor instrument panel. The gauge includes an adjustable pointer to correspond the gauge to the tare weight of the particular loaded it is applied to; a calibration factor which allows the operator to convert from the pressure reading on the gauge to a weight value in pounds or kilograms; and a safety line for warning the operator when the safe load limit of the loader is being surpassed. The method includes the steps of: lifting an object on the loader; sensing the pressure exerted in the system by the gauge when the object is lifted by the loader; displaying the pressure; and converting the pressure displayed to a weight value based on the predetermined calibration factor.

Claims

1. A weight scale for a loader operated by a hydraulic system and incorporated on an operator controlled vehicle, comprising:

(a) a hydraulic line for operating the loader; and

(b) a gauge in pressure communication with the hydraulic line, said gauge being directly responsive to changes in hydraulic pressure in the hydraulic line and visually indicating the changes in pressure thereon, the gauge including

(i) a movable pointer adjustable to a tare weight of the loader with which the gauge is used,

(ii) a dial having a series of indicia representing different pressures, and

(iii) a predetermined calibration factor for converting the pressure indicated to a weight value,

wherein, when an object is lifted by the loader, a pressure is visually indicated on the dial by the pointer, which can be converted by the operator of the vehicle to the weight value based on the calibration factor for said loader.

2. The scale as recited in claim 1, wherein the weight value is selected from the group comprising pounds and kilograms.

3. The scale as recited in claim 2, wherein the dial further comprises a line representing the safe lifting capacity of the loader.