Lifting device employing a weight integrative weighing system
First Claim
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1. A weighing system for a device lifting a load comprising:
- a frame;
a sprocket-wheel attached to said frame to rotate about an axis;
a carriage operationally coupled to said sprocket-wheel for movement relative to said frame;
a load bearing member adapted to engage said load, said load bearing member connected to said carriage, with said load exerting a force upon said carriage;
a sensing device, coupled between said frame and said carriage, said sensing device adapted to sense said force, a magnitude of which varies in relation to rotational movement of said sprocket-wheel, said sensing device thereby producing a sequence of force measurements corresponding to rotational movement of said sprocket-wheel;
a detector having an output indicating an occurrence of a predetermined amount of rotational movement of said sprocket-wheel; and
processing means, electronically coupled to said sensing means and to said output of said detector, for computing an average of a sequence of force measurements corresponding to said predetermined amount of rotational movement of said sprocket-wheel;
whereby said average represents a weight calculation of said load.
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Abstract
A lifting device that has a carriage supported by a chain which passes over a sprocket-wheel disposed to rotate about an axis and features a sensing device which allows detecting forces on the chain for a predetermined duration so that the weight of a load supported by the carriage may be determined by calculating an average weight during the duration. To further enhance the accuracy of the measurement, the load cell is designed to accurately measure the load placed thereon independent of the position of the load on the cell.
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Citations
22 Claims
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1. A weighing system for a device lifting a load comprising:
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a frame; a sprocket-wheel attached to said frame to rotate about an axis; a carriage operationally coupled to said sprocket-wheel for movement relative to said frame; a load bearing member adapted to engage said load, said load bearing member connected to said carriage, with said load exerting a force upon said carriage; a sensing device, coupled between said frame and said carriage, said sensing device adapted to sense said force, a magnitude of which varies in relation to rotational movement of said sprocket-wheel, said sensing device thereby producing a sequence of force measurements corresponding to rotational movement of said sprocket-wheel; a detector having an output indicating an occurrence of a predetermined amount of rotational movement of said sprocket-wheel; and processing means, electronically coupled to said sensing means and to said output of said detector, for computing an average of a sequence of force measurements corresponding to said predetermined amount of rotational movement of said sprocket-wheel; whereby said average represents a weight calculation of said load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A weighing system for a device lifting a load comprising:
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a frame; a sprocket-wheel attached to said frame to rotate about an axis; a carriage operationally coupled to said sprocket-wheel for movement relative to said frame; a load bearing member adapted to engage said load, said load bearing member connected to said carriage, with said load exerting a force upon said carriage; means, coupled between said frame and said carriage, for sensing said force, a magnitude of which varies in relation to rotational movement of said sprocket-wheel, said sensing means being adapted to produce electrical signals corresponding to the sensed force, thereby creating a sequence of force measurements; a detector having an output indicating an occurrence of a predetermined amount of rotational movement of said sprocket-wheel; processing means, electronically coupled to said force sensing means and to said output of said detector, for computing an average of a sequence of force measurements corresponding to said predetermined amount of rotational movement of said sprocket-wheel, whereby said average represents a weight calculation of said load; and a display means, in electrical communication with said processing means, for producing a visual representation of said weight calculation. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A weighing system for a device lifting a load comprising:
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a frame; a sprocket-wheel attached to said frame to rotate about an axis; a carriage operationally coupled to said frame for movement relative thereto; a flexible member passing over said wheel to form two spaced-apart opposing sections, one of which is fixedly secured to said frame, defining an anchor portion, with the remaining section attached to said carriage, defining a load portion, with said load portion being spaced-apart from said axis a first distance and said anchor portion being spaced apart from said axis a second distance; a load bearing member adapted to engage said load, said load bearing member connected to said carriage for movement relative to said frame and exerting a first force on said load portion corresponding to a weight of said load, said first force producing a second force on said anchor portion, with said second force being proportional to a ratio of said first and second distances; and means, coupled to said frame, for sensing variations in said second force as said load bearing member moves relative to said frame, thereby producing a plurality of measurements of said second force; a detector having an output indicating an occurrence of a predetermined amount of rotational movement of said sprocket-wheel; and processing means coupled to said means for sensing to receive said plurality of measurements and coupled to said detector, whereby said average represents a weight calculation of said load. - View Dependent Claims (19, 20, 21, 22)
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Specification