The invention relates to a handcart composed of a main frame, four wheels properly assembled with a frame rod of the main frame, a grip, two positioning sleeves combined movably with the grip, and two joint assemblies installed between the main frame and the grip for changeably connecting the main f
The invention relates to a handcart composed of a main frame, four wheels properly assembled with a frame rod of the main frame, a grip, two positioning sleeves combined movably with the grip, and two joint assemblies installed between the main frame and the grip for changeably connecting the main frame with the grip. The grip together with the positioning sleeves can be aligned flat or become 90° relative to the main frame by means of the joint assemblies. Then the handcart can be transformed into a two-wheel handcart or a four-wheel one by handling the grip through movement of the pivotal bases of the joint assemblies.
대표청구항▼
1. A handcart comprising: a main frame provided with a frame rod that has two ends respectively provided with a positioning member and a fitting hole;a grip having two ends, each end pivotally assembled with a positioning sleeve which is also pivotally combined with said frame rod of said main frame
1. A handcart comprising: a main frame provided with a frame rod that has two ends respectively provided with a positioning member and a fitting hole;a grip having two ends, each end pivotally assembled with a positioning sleeve which is also pivotally combined with said frame rod of said main frame via two joint assemblies;said positioning sleeves movably fitting around said end of said grip and provided with a U-shaped positioning groove at an end;a connecting rod unit connected between said two positioning sleeves and composed of two parallel horizontal rods and two parallel vertical rods fixed between said two parallel horizontal rods, enabling said two positioning sleeves to move together;said two joint assemblies installed between said main frame and said grip, said joint assemblies enabling said grip to become aligned to said main frame or to become vertical to said main frame;said joint assemblies respectively consisting of a pivotal block, a left pivotal base and a right pivotal base, said pivotal block being cross-shaped and having two projections, one upper and one lower, in an intermediate portion, said left and right pivotal base respectively provided with a vertical groove, said vertical groove formed with a blocking surface at an end and a vertical groove formed with a blocking surface at an end and said vertical groove provided with a crosswise pin hole and a said pivotal block of each joint assembly allows said right pivotal base to bend up for 90° relative to said bottom surface of said vertical groove of said left pivotal base so that said connecting rod unit and said positioning sleeves together with said grip may be bent up and down accurately and stably, easily handling for aligning or bending for 90° said grip relative to said main frame. 2. The handcart as claimed in claim 1, wherein said projections of said pivotal blocks of said joint assemblies contact with and stop by said blocking surface of said vertical grooves so that the adjustment of said grip and said main frame is very stable and simple. 3. A handcart comprising: a main frame provided with a frame rod that has two ends respectively provided with a positioning member and a fitting hole;a grip having two ends assembled respectively with a positioning sleeve which is also pivotally combined with said frame rod of said main frame by means of two joint assemblies;each said positioning sleeve movably fitting around said each end of said grip and provided with a U-shaped positioning groove at an end and a fitting projection formed under said positioning groove;said two joint assemblies installed between said main frame and said grip, said joint assemblies enabling said grip to become aligned to said main frame or to become vertical to said main frame;said joint assemblies respectively consisting of a pivotal block, a left pivotal base and a right pivotal base, said pivotal block shaped rectangular and having two pivotal members at two sides, said left and said right pivotal base provided respectively with a vertical groove at one end and a circular fitting member at another end and said vertical groove provided with a bottom surface, a crosswise pin hole and a crosswise fitting groove; andsaid pivotal block of each joint assembly allows said right pivotal base to bend up for nearly 90° relative to said bottom surface of said vertical groove of said left pivotal base so that said grip and together with said positioning sleeves may be bent up and down accurately and stably, easily handling for aligning or bending for 90° said grip relative to said main frame. 4. A handcart comprising: a main frame provided with a frame rod that has two ends respectively provided with a positioning member and a fitting hole;a grip having two ends, each end assembled respectively with a positioning sleeve which is also pivotally combined with said frame rod of said main frame by means of two joint assemblies; each positioning sleeve movably fitting around each end of said grip and provided with a U-shaped positioning groove at an end, a connecting rod unit provided between said two positioning sleeves and consisting of two parallel horizontal rods and two parallel vertical rods fixed between said two parallel horizontal rods so that said two positioning sleeves may move together;said two joint assemblies installed between said main frame and said grip, said joint assemblies enabling said grip to become aligned to said main frame or to become vertical to said main frame, said joint assemblies respectively consisting of a pivotal block, a left pivotal base and a right pivotal base, said pivotal block shaped rectangular and having two pivotal members, said two pivotal members bored with a pivotal hole, said left and said right pivotal base provided respectively with a vertical groove at one end and a circular fitting member, and said vertical groove provided with a crosswise pin hole and a bottom surface;said pivotal block of each joint assembly allows said right pivotal base to bend up for 90° relative to said bottom surface of said vertical groove of said left pivotal base so that said grip and said positioning sleeves and said connecting rod unit together may be bent up and down accurately and stably, easily handling for aligning or bending for 90° said grip relative to said main frame; andtwo reinforcing strips respectively having one end fixed on one side of said main frame and another end bored with a downward notch, said downward notch fitting with said fitting projection of said positioning sleeves so as to maintain stably a vertical condition of said positioning sleeves relative to said main frame. 5. A handcart comprising: a main frame provided with a frame rod that has two ends respectively provided with a positioning member and a fitting hole;a grip having two ends, each and assembled respectively with a positioning sleeve which is pivotally combined with said frame rod of said main frame by means of two joint assemblies; each positioning sleeve movably fitting around each end of said grip and provided with a U-shaped positioning groove at an end, a connecting rod unit provided between said two positioning sleeves and consisting of two parallel horizontal rods and two parallel vertical rods fixed between said two parallel horizontal rods so that said two positioning sleeves may move together;said two joint assemblies installed between said main frame and said grip, said joint assemblies enabling said grip to become aligned to said main frame or to become vertical to said main frame, said joint assemblies respectively consisting of a pivotal block, a left pivotal base and a right pivotal base, said pivotal block shaped rectangular and having a pivotal member at two sides, said pivotal member bored with an pivotal hole, said left pivotal base and said right pivotal base provided respectively with a vertical groove at one end and a circular fitting member at another end;said pivotal block of each joint assembly allows said right pivotal base to bend up for 90° relative to said vertical groove of said left pivotal base so that said grip together with said positioning sleeves and said connecting rod unit may be bent up and down accurately and stably, easily handling for aligning or bending for 90° said grip relative to said main frame; anda connecting-rod-unit securing unit consisting of two positioning members fixed with said main frame and having a fitting notch at one end, a groove member fixed with said main frame, a movable member having a fitting notch, a guide curve and a stop bent tip at one end and fitting movably in a central groove of said groove member, a spring having one end hooked with an end of said movable member and another end fixed with said main frame, said notches of said two positioning members and said movable member coming in a line so that a lower rod of said connecting rod unit between said two positioning sleeves fit in said fitting notches of said two positioning members and said movable member, keeping stably said grip together with said positioning sleeves in a vertical condition relative to said main frame.
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이 특허에 인용된 특허 (10)
Malloy Molly A. ; Loewenthal Howard L., Adjustable handle for a manually movable vehicle.
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