US 6,785,597 B1 · Hydraulic stabilizer system and process for monitoring load conditions

Abstract

A process for monitoring load conditions on a lifting machine having a rated load moment includes determining an actual load moment of the lifting machine due a weighted load. The actual load moment may be determined by measuring a tilt pressure within a hydraulic tilt cylinder of the lifting machine, and then calculating the actual load moment from the tilt pressure within the hydraulic tilt cylinder. The location of a center of gravity of the weighted load is also determined by measuring a lift pressure within a hydraulic lift cylinder of the lifting machine, and then calculating the weight of the weighted load from the lift pressure. Once the weight is determined, the location of the center of gravity of the weighted load may be found using the actual load moment and the calculated weight. Information about the weight and the location of the center of gravity of the weighted load may be also provided to a user as well as warnings if the operating parameters of the lifting machine are in danger of being exceeded or actually exceeded. If a load pressure switch of the lifting machine is activated, at the very least, the lifting function of the machine will be disabled.

Claims49

Dependent claims

A process for monitoring load conditions on a lifting machine having a rated load moment, comprising the steps of:

determining an actual load moment of the lifting machine due a weighted load, the determining step including the steps of:
measuring a tilt pressure within a hydraulic tilt cylinder of the lifting machine, and calculating the actual load moment from the tilt pressure within the hydraulic tilt cylinder, and
measuring a lift pressure within a hydraulic lift cylinder of the lifting machine, calculating the weight of the weighted load from the lift pressure, and calculating a location of the center of gravity of the weighted load using the actual load moment and the calculated weight;
activating a first warning if the actual load moment is below a first predetermined load moment;
activating a second warning if the actual load moment is above the firs t predetermined load moment and below a second predetermined load moment;
and
activating a third warning if the actual load moment is above the second predetermined load moment.

4 more elements

A hydraulic stabilizer system, comprising:

a hydraulic lift having a rated load moment;
a means for measuring pressure within the hydraulic lift;
a processor for determining an actual load moment of the hydraulic lift and for determining a weight of a load on the hydraulic lift based on pressure within the hydraulic lift;
an illuminated display for warning an operator of the hydraulic lift if at least one predetermined operating parameter is exceeded;
and
a load pressure switch for disabling the hydraulic lift if another predetermined operating parameter is exceeded;
wherein the hydraulic lift includes a frame, at least one load bearing member operationally connected to the frame for movement relative thereto, a hollow lift cylinder housing a lift piston and hydraulic fluid, the lift cylinder piston operationally connected to the load bearing member, with the hydraulic fluid disposed between the lift piston and one end of the frame, the lift piston imparting a lift force upon the hydraulic fluid within the lift cylinder proportional to a weight associated with the load bearing member, and a hollow tilt cylinder housing a tilt piston and hydraulic fluid, the tilt piston operationally connected to the load bearing member, with the hydraulic fluid within the tilt cylinder disposed between the tilt piston and one end of the frame, the tilt piston imparting a tilt force upon the fluid proportional to an actual load moment associated with the load bearing member;
and
wherein the means for measuring pressure within the hydraulic lift is a lift pressure sensor in fluid communication with the hydraulic fluid within the lift cylinder, for measuring pressure of the hydraulic fluid within the lift cylinder for a period of time and creating electrical signals corresponding thereto, defining at least one pressure measurement within the lift cylinder, with the pressure within the lift cylinder being related to the lift force associated with the load bearing member, and a tilt pressure sensor in fluid communication with the hydraulic fluid within the tilt cylinder, for measuring pressure of the hydraulic fluid within the tilt cylinder for a period of time and creating electrical signals corresponding thereto,
defining at least one pressure measurement within the tilt cylinder, with the pressure being related to the tilt force associated with the load bearing member.

7 more elements

A hydraulic stabilizer system, comprising:

a hydraulic lift having a rated load moment and maximum lifting capacity, wherein the hydraulic lift includes a frame, at least one load bearing member operationally connected to the frame for movement relative thereto, a hollow lift cylinder housing a lift piston and hydraulic fluid, the lift cylinder piston operationally connected to the load bearing member, with the hydraulic fluid disposed between the lift piston and one end of the frame, the lift piston imparting a lift force upon the hydraulic fluid within the lift cylinder proportional to a weight associated with the load bearing member, and a hollow tilt cylinder housing a tilt piston and hydraulic fluid, the tilt piston operationally connected to the load bearing member, with the hydraulic fluid within the tilt cylinder disposed between the tilt piston and one end of the frame, the tilt piston imparting a tilt force upon the fluid proportional to an actual load moment associated with the load bearing member;
at least one lift pressure switch in fluid communication with the hydraulic fluid within the lift cylinder, for measuring pressure of the hydraulic fluid within the lift cylinder, with the pressure within the lift cylinder being related to the lift force associated with the load bearing member, and at least one tilt pressure switch in fluid communication with the hydraulic fluid within the tilt cylinder, for measuring pressure of the hydraulic fluid within the tilt cylinder, with the pressure being related to the tilt force associated with the load bearing member;
an illuminated display for warning an operator of the hydraulic lift if at least one predetermined operating parameter is exceeded, wherein the illuminated display is in communication with the at least one lift pressure switch and the at least one tilt pressure switch;
and
a load pressure switch for disabling the hydraulic lift if another predetermined operating parameter is exceeded, wherein the lift pressure switch measures the lift force and the tilt pressure switch measures the tilt force, whereby the illuminated display activates a first warning if the actual load moment is below a first predetermined load moment, activates a second warning if the actual load moment is above the first predetermined load moment and below a second predetermined load moment, activates a third warning if the actual load moment is above the second predetermined load moment, and disables the hydraulic lift if the weight is above the maximum lifting capacity.

2 more elements

A hydraulic stabilizer system, comprising:

a hydraulic lift having a rated load moment and maximum lifting capacity, wherein the hydraulic lift includes a frame, at least one load bearing member operationally connected to the frame for movement relative thereto, a hollow lift cylinder housing a lift piston and hydraulic fluid, the lift cylinder piston operationally connected to the load bearing member, with the hydraulic fluid disposed between the lift piston and one end of the frame, the lift piston imparting a lift force upon the hydraulic fluid within the lift cylinder proportional to a weight associated with the load bearing member, and a hollow tilt cylinder housing a tilt piston and hydraulic fluid, the tilt piston operationally connected to the load bearing member, with the hydraulic fluid within the tilt cylinder disposed between the tilt piston and one end of the frame, the tilt piston imparting a tilt force upon the fluid proportional to an actual load moment associated with the load bearing member;
at least one tilt pressure switch in fluid communication with the hydraulic fluid within the tilt cylinder, for measuring pressure of the hydraulic fluid within the tilt cylinder, with the pressure being related to the tilt force associated with the load bearing member;
an illuminated display for warning an operator of the hydraulic lift if at least one predetermined operating parameter is exceeded, wherein the illuminated display is in communication with the at least one tilt pressure switch;
and
a load pressure switch for disabling the hydraulic lift if the predetermined operating parameter is exceeded, wherein the tilt pressure switch measures the tilt force, whereby the illuminated display activates a warning if the actual load moment is above a predetermined load moment.

2 more elements

A hydraulic stabilizer system, comprising:

a hydraulic lift having a rated load moment;
a means for measuring pressure within the hydraulic lift;
a processor for determining an actual load moment of the hydraulic lift and for determining a weight of a load on the hydraulic lift based on pressure within the hydraulic lift, the processor including at least one subroutine of a program stored in a memory to be operated on by the processor, determining, from at least one pressure measurement within the lift cylinder, the weight of the load on the hydraulic lift, and determining, from at least one pressure measurement within the tilt cylinder, the actual load moment of the load on the hydraulic lift, wherein another sub-routine of the program stored in the memory to be operated on by the processor uses the actual load moment and the weight of the load to determine a location of a center of gravity of the load o the hydraulic lift;
an illuminated display for warning an operator of the hydraulic lift if at least one predetermined operating parameter is exceeded;
and
a load pressure switch for disabling the hydraulic lift if another predetermined operating parameter is exceeded.

3 more elements

Dependencies are inferred from the claim text.

Hydraulic stabilizer system and process for monitoring load conditions

Life of this patent

Hydraulic stabilizer system and process for monitoring load conditions

Life of this patent

Abstract

Claims49