A lifting implement, such as a shovel has a handle and a load bearing member. The handle includes an articulated joint dividing the handle between a major portion and a lever portion. The lever is adapted to pivot within the range of an acute angle relative to the handle profile. The lever and the m
A lifting implement, such as a shovel has a handle and a load bearing member. The handle includes an articulated joint dividing the handle between a major portion and a lever portion. The lever is adapted to pivot within the range of an acute angle relative to the handle profile. The lever and the major portion of the handle each have a means for mounting a resilient member therebetween, where the resilient member is capable of absorbing shock and storing energy when urged by the pivoting of the lever within the range during the motion of lifting a load, and which stored energy is released when the load is being heaved by the implement. The handle may include a hand grip and a gripping portion on the major portion spaced from the articulated joint such that a triangle is formed with the hand grip, the gripping portion and the articulated joint at the apex of the triangle, wherein the apex of the triangle.
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1. An elongated handle for a lifting instrument including a load bearing member, the handle having a distal end and a proximal end, the distal end being configured for connection to the load bearing member; the handle having a handle profile and including an articulated joint at a minor distance fro
1. An elongated handle for a lifting instrument including a load bearing member, the handle having a distal end and a proximal end, the distal end being configured for connection to the load bearing member; the handle having a handle profile and including an articulated joint at a minor distance from the proximal end, the articulated joint dividing the handle between a major portion extending from the distal end to the articulated joint, and a lever portion extending from the articulated joint to the proximal end; a first prehension zone provided at the proximal end of the lever portion and a second prehension zone on the major portion; the lever portion being pivotable about the articulated joint within the range of an acute angle relative to the handle profile, the handle profile defining a triangle with a base of the triangle extending between the first and second prehension zones and the articulated joint forming an apex of the triangle; the lever portion and the major portion of the handle each mounting respective ends of a resilient member extending therebetween, the resilient member storing energy when applied by the pivoting of the lever portion within the range due to a load transferred to the handle characterized by the translation of the apex of the triangle with respect to the base causing the resilient member to absorb shock and store energy. 2. The elongated handle as defined in claim 1, wherein the handle includes a hand grip at the first prehension zone and a gripping portion at the second prehension zone, and wherein the triangle is an isosceles triangle, whereby the apex of the triangle is translated during a load transferred to the handle. 3. The elongated handle as defined in claim 1, wherein the resilient member is a coiled spring. 4. The elongated handle as defined in claim 3, wherein the coiled spring stores the energy in compression. 5. The elongated handle as defined in claim 3, wherein the coiled spring stores the energy in tension. 6. The elongated handle as defined in claim 1, wherein the range is between 0° and 20°. 7. The elongated handle as defined in claim 1, wherein the lever portion includes a recessed seat adjacent the articulated joint, wherein first and second brackets are located at the seat, the first bracket being provided to the lever portion while the second bracket is provided to the major portion of the handle; and wherein the resilient member is fixed to and extends between the first and second brackets, overlying the seat. 8. The elongated handle as defined in claim 1, wherein the resilient member is an elongated flexible member. 9. The elongated handle as defined in claim 8, wherein the elongated flexible member is a spring blade. 10. The elongated handle as defined in claim 9, wherein the spring blade is made of spring steel. 11. The elongated handle as defined in claim 1, wherein the lever portion and the major portion of the handle each include a bracket for mounting the resilient member therebetween, the resilient member storing energy when urged by the pivoting of the lever within the range during the motion of lifting a load. 12. The elongated as defined in claim 1, wherein the resilient member is adjustable to provide different degrees of stiffness to the handle. 13. The elongated handle as defined in claim 1, wherein the resilient member is adjustable to provide different degrees of stiffness to the handle, and wherein the resilient member is an elongated flexible member held between a pair of brackets one on the lever portion and the other on the major portion, whereby one of the brackets may be moved relative to the other to vary the length of the elongated flexible member to thereby adjust the degree of stiffness of the resilient member. 14. The elongated handle as defined in claim 13 wherein the elongated flexible member is a spring blade and one end of the blade is fixed to a movable bracket of the brackets, the movable bracket being movably engaged to one of the lever portion and the major portion. 15. The lifting implement as defined in claim 14, wherein the movable bracket is mounted for movement to the major portion and the other bracket is fixed to the lever portion and is in the form of a geared wheel journalled to the axis of the joint and forming part of the lever portion, the geared wheel engaging a geared rack fixed to the movable bracket such that when the geared wheel is rotated, it moves the movable bracket and the blade relative to the other bracket thereby adjusting the stiffness of the blade. 16. The elongated handle as defined in claim 14 wherein each of the brackets is movable, one on the major portion and the other on the lever portion; a track is fixedly mounted to one of the major portion and the lever portion so that one or the other of the brackets may be selectively engaged thereby; the spring blade being restrained from axial movement while the bracket selectively engaged on the track can determine the length of the spring blade between the brackets thus determining the stiffness of the spring blade. 17. The lifting implement as defined in claim 14, wherein the spring blade is a spring steel blade. 18. A lifting implement including an elongated handle with a distal end and a proximal end and a load bearing member at the distal end; the handle having a handle profile and including an articulated joint at a minor distance from the proximal end dividing the handle between a major portion extending from the distal end to the joint, and a lever portion extending from the joint to the proximal end; a first prehension zone provided at the proximal end of the lever portion and a second prehension zone on the major portion; the lever portion adapted to pivot about the joint within the range of an acute angle relative to the handle profile, the handle profile defining a triangle with a base of the triangle extending between the first and second prehension zones and the joint forming an apex of the triangle; the lever portion and the major portion of the handle each mounting respective ends of a resilient member therebetween, the resilient member storing energy when applied by the pivoting of the lever within the range during the motion of engaging a load characterized by the translation of the apex of the triangle with respect to the base causing the resilient member to absorb shock and store energy. 19. The lifting implement as defined in claim 18, wherein the handle includes a hand grip at the first prehension zone and a gripping portion at the second prehension zone and the triangle is an isosceles triangle, whereby the apex of the triangle is translated during a lifting and heaving motion of the lifting implement. 20. The lifting implement as defined in claim 18, wherein the handle profile is that of an arc with a chord extending from the proximal end to the tip of the implement at the distal end of the handle and the articulated joint is spaced from the chord. 21. An energy storing device for a lifting implement including a handle and a load bearing portion wherein the energy storing device includes an articulated joint to be mounted to a proximal end of the handle; the device forming a lever extending from the joint to a first prehension zone provided at the proximal end of the lever and a second prehension zone on the handle; the lever being pivotable about the joint within the range of an acute angle relative to the handle; the handle and the lever defining a triangle with a base of the triangle extending between the first and second prehension zones and the joint forming the apex of the triangle; the lever and the handle each mounting respective ends of a resilient member therebetween, the resilient member storing energy when applied by the pivoting of the lever within the range during the motion of engaging a load characterized by the translation of the apex of the triangle with respect to the base causing the resilient member to absorb shock and store energy.
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이 특허에 인용된 특허 (14)
Gosselin, Joseph A., Auxiliary handle for a shovel.
Amundson Frank M. (Punxsutawney PA) Manners Herbert C. (Punxsutawney PA) Jeffries Paul M. (Punxsutawney PA), Device for removing or stripping material.
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