Weighing system

• US 4,771,837 A
• Filed: 05/14/1987
• Issued: 09/20/1988
• Est. Priority Date: 10/20/1986
• Status: Expired due to Fees

• Current Assignee: Waste Management Incorporated
• Original Assignee: Breakthru Industries Incorporated
• Inventors: Mikelk, Paul D., Appleton, Gregory H.
• Primary Examiner(s): MILLER JR, GEORGE
• Application Number:
  US07/050,321
• Time in Patent Office: 495 Days
• Field of Search: 177/145, 177/139, 177/141
• US Class Current: 177/139
• CPC Class Codes: B65F 2003/022 the discharging means comprising a device for determining the weight of the content of refuse receptacles
• CPC Class Codes: B65F 2003/0279 the discharging means mounted at the front of the vehicle
• CPC Class Codes: B65F 3/04 Linkages, pivoted arms, or pivoted carriers for raising and subsequently tipping receptacles
• CPC Class Codes: B65F 3/041 Pivoted arms or pivoted carriers
• CPC Class Codes: B65F 3/043 with additional means for keeping the receptacle substantially vertical during raising
• CPC Class Codes: G01G 19/083 lift truck scale

Abstract

A weighing system for a refuse truck having lifting means for engaging and lifting a refuse container. The weighing system comprises a transducer which is mounted on the lifting means of the truck for sensing the weight of the refuse container for producing an electrical analog signal. Electrical digitizing means convert and analog signal to a digital signal which is indicative of the weight which is sensed by the transducer. A limit switch is operatively connected to the transducer so that the transducer is energized at a point when a full container is supported by the lifting means and when an empty container is supported by the lifting means for the purpose of determining the weight of the refuse in the container.

Claims

1. Weighing system for a refuse truck having a refuse receptacle which has a top opening and hydraulically actuated lifting means for engaging and lifting a refuse container which has a top opening from a resting position outside of the truck to an inverted position above the opening of the refuse receptacle to permit the contents of the refuse container to fall into the refuse receptacle, said lifting means also being effective to lower said refuse container to said resting position, said weighing system comprising:

(a) a fluid pressure transducer which is operatively connected to said hydraulically actuated lifting means of said refuse truck for sensing the weight of a refuse container when the container is lifted and lowered by the lifting means, said transducer being effective for generating an electrical analog signal which is proportional to the weight which is sensed by the transducer,

(b) electrical digitizing means which is operatively connected to said transducer for converting said analog signal to a digital signal which is indicative of the weight which is sensed by the transducer,

(c) a source of electrical power, and

(d) electrical control means, including a normally open pressure actuated threshold switch which is operatively connected to said hydraulic system for connecting said transducer to said source of electrical power for energizing said transducer, said switch being operatively connected to said lifting means so that said switch is closed during the lifting of a full refuse container and during the lowering of an empty refuse container, said electrical control means being operatively connected to said electrical digitizing means for producing a first digital signal at a point during the lowering of an empty refuse container which is indicative of the weight of said empty refuse container.

2. Weighing system as recited in claim 1, wherein said first and second digital signals occur when the refuse container is at the same spatial position relative to the truck.

3. Weighing system as recited in claim 1, wherein said electrical control means comprises:

(a) an electronic scale reader which is operatively connected to said source of electrical power, said electrical digitizing means, said lifting means and said switch so that said scale reader is energized upon closing of said switch, and

(b) a computer which is operatively connected to said transducer and said electronic positioning scale and said electrical digitizing means.

4. Weighing system as recited in claim 3, wherein said hydraulically actuated system includes a cylinder, a piston which is slidably mounted within the cylinder, a piston rod which is fixed to the piston, and a hydraulic pressure line which is operatively connected to the cylinder, and, wherein said electronic scale reader is operatively connected to the cylinder and the piston rod for measuring the relative movement between the piston rod and the cylinder.

5. Weighing system as recited in claim 3, wherein said transducer and said switch are operatively connected to said hydraulic pressure line.