IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0257362
(1999-02-25)
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발명자
/ 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
11 인용 특허 :
6 |
초록
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A rotary lever assembly for a wrench includes an elongated tubular coupler, which has a tongue of a polygonal cross-section that is adapted to engage fittingly a polygonal groove in a socket portion of a fastener-rotating element. A movable rod is mounted movably in the coupler, and is biased by a s
A rotary lever assembly for a wrench includes an elongated tubular coupler, which has a tongue of a polygonal cross-section that is adapted to engage fittingly a polygonal groove in a socket portion of a fastener-rotating element. A movable rod is mounted movably in the coupler, and is biased by a spring to an extended position, in which a ball projects partially from a hole in the tongue to engage a positioning cavity in the socket portion. In this way, the fastener-rotating element can rotate synchronously with the coupler of the rotary lever assembly. When the movable rod is pushed to a retracted position, a hole in the movable rod is aligned with the hole in the tongue. In this case, the socket portion can move on the tongue in view of the condition that the inner surface of the socket portion pushes the ball to retract entirely into the hole in the tongue. When the movable rod is released and is thus biased by the spring to move from the retracted position to the extended position, an inclined guide surface of the movable rod pushes the ball to project partially from the hole in the tongue.
대표청구항
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[ I claim:] [1.] A rotary lever assembly for a wrench, the wrench including a fastener-rotating element with a socket portion, which has a plurality of interior side walls that define cooperatively a polygonal groove, each of the interior side walls being formed with a positioning cavity, said rotar
[ I claim:] [1.] A rotary lever assembly for a wrench, the wrench including a fastener-rotating element with a socket portion, which has a plurality of interior side walls that define cooperatively a polygonal groove, each of the interior side walls being formed with a positioning cavity, said rotary lever assembly including an elongated tubular coupler, which has a tongue of a polygonal cross-section that is adapted to engage fittingly the groove in the fastener-rotating element, said tongue including a spring-biased ball, which is adapted to engage one of the positioning cavities in the socket portion of the fastener-rotating element so as to retain said tongue within the socket portion of the fastener-rotating element, thereby permitting synchronous rotation of the fastener-rotating element with said coupler, wherein the improvement comprises:a wrench body having a horizontal handle and a hollow cylindrical driving head, which is formed integrally with said handle and which has an open upper end and an open lower end, said driving head of said wrench body having a small-inner-diameter upper portion and a large-inner-diameter lower portion, between which a shoulder is defined:said coupler being mounted rotatably within said driving head and including:a tubular body having an axial central bore, which is formed through said coupler and which has a large-diameter section and a small-diameter section that is smaller in diameter than said large-diameter section, said large-diameter and small-diameter sections defining a shoulder therebetween, said tubular body having a polygonal-cross-sectioned portion, which has a plurality of side walls, each of which has two vertical edges, two edge portions that are located respectively adjacent to said vertical edges, and a vertical slot that is located between said edge portions, said polygonal-cross-sectioned portion of said coupler having a top surface and a bottom surface, which contacts said shoulder of said wrench body, said tubular body further having a ball receiving hole, which is formed radially in a wall of said tubular body and which is communicated with said central bore, and an inward flange, which extends inward into a radial outer end portion of said ball receiving hole;a moveable rod being disposed movably within said central bore in said tubular body and having a thick portion and a thin portion, which is thinner than said thick portion, said thick portion of said movable rod being slightly smaller in diameter than said large-diameter section of said central bore in said tubular body, said thin portion of said movable rod being slightly smaller in diameter than said small-diameter section of said central bore in said tubular body, said movable rod having a retaining hole and an inclined guide surface;a lower central shaft extending integrally and downwardly from said polygonal-cross-sectioned portion, and an upper central shaft extending integrally and upwardly from said polygonal-cross-sectioned portion;said ball being confined within said hole in said tubular body by said inward flange of said tubular body and extending partially from said hole in said tubular body; anda coiled spring sleeved on said thin portion of said movable rod between said thick portion of said movable rod and said shoulder of said tubular body to bias said movable rod to an extended portion, in which an end portion of said thick portion of said movable rod extends from said central bore in said tubular body, said end portion of said thick portion of said movable rod being capable of being pushed to move said movable rod to a retracted position, in which said retaining hole in said movable rod is aligned with said ball receiving hole in said tubular body, thereby permitting movement of the socket portion on said tongue due to the fact that the socket portion pushes said ball to retract entirely into said ball receiving hole in said tubular body and said retaining hole in said movable rod, location of said movable rod at said retracted position permitting said ball to contact said inclined guide surface of said movable rod so that, when said movable rod is released and is thus biased by said spring to move from said retracted position to said extended position, said ball is pushed by said inclined guide surface of said movable rod to project partially from said ball receiving hole in said tubular body;a rigid ring plate fixed within said upper end of said driving head and sleeved on said upper central shaft of said coupler; and,a direction control mechanism including:a rotary member mounted rotatably within said driving head and confined within said large-inner-diameter lower portion of said driving head of said wrench body, said rotary member having a top surface and a central hole which is formed therethrough, said lower central shaft of said coupler extending through said central hole in said rotary member, thereby journalling said coupler on said ring plate and said rotary member;a plurality of angularly equidistant posts extending integrally and upwardly from said top surface of said rotary member and being in frictional contact with said driving head;a plurality of angularly equidistant vertical stop cylinders, each of which being confined between an adjacent pair of said posts and between said driving head of said wrench body and said polygonal-cross-sectioned portion of said coupler, each of said cylinders contacting the adjacent pair of said posts, said driving head of said wrench body and one of said edge portions of one of said side walls of said polygonal-cross-sectioned portion of said coupler to permit rotation of said rotary member with said wrench body in only a first direction; anda positioning unit including an adjacent pair of first and second positioning holes that are formed in one of said coupler and said rotary member, and a spring-biased ball unit which is disposed on the other one of said coupler and said rotary member and which includes a well formed in a corresponding one of said coupler and said rotary member, a ball placed in said well, and a coiled spring that pushes a portion of said ball from aid well to engage a selected one of said first and second positioning holes, said rotary member being capable of being rotated relative to said coupler so as to move said spring-biased ball unit from the selected one of said first and second positioning holes to the other one of said first and second positioning holes, thereby permitting said coupler to rotate with wrench body in only a second direction which is opposite to the first direction.
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