Please select the most similar patent number from A, B, C and D. Which number is?
A weighted-resistance, endurance and balance strength training device. Two antiskid slide plates (2) are disposed at two footings (10) of a main connecting frame (8). Weighted rods (1) and a short weighted rod (3) are disposed at the center of the main connecting frame (8). Two weighted-rod insertion holes (11) are formed in the main connecting frame (8) in a transverse direction and a longitudinal direction. Two adjustable hook plates (9) are disposed at the outer side of the main connecting frame (8). The main connecting frame (8) is connected to a front connecting frame (7). A pulley (5) convenient to move is disposed at the other end of the main body of the front connecting frame (7). The short weighted rod (3) is disposed on the front connecting frame (7). Also provided is a manufacturing method for the weighted-resistance, endurance and balance strength training device.
A: The utility model discloses an anti-smashing strength training device, which comprises a bottom plate, both ends of the upper surface of the bottom plate are provided with adjusting devices, the side of a first vertical plate of the adjusting device is provided with a positioning device, and the upper surface of a second vertical plate of the adjusting device is provided with a fixing plate, the side of the fixing plate is provided with a strip hole, and a support device is arranged inside the strip hole, both ends of the side of a first screw rod of the support device are threadedly connected with two second nuts, and the side surface of the second nut is in contact with the side surface of a counterweight, the upper end of the side surface of the fixing plate is provided with a cylindrical nut, and the inner part of the cylindrical nut is provided with a stabilizing device, and the second screw rod of the stabilizing device is threadedly connected with the cylindrical nut. The anti-smashing strength training device has a simple structure, can be disassembled and folded, can reduce the occupied area of the entire training device, save space, and is convenient for people of different body types to perform strength training, and is convenient to use.
B: A shear-fork type feeding device, comprising a cross beam (1), an inner shear-fork bracket (3), an outer shear-fork bracket (4), and a chuck framework (2). The upper end of the inner shear-fork bracket is connected to an inner U-shaped connecting frame (7). The upper end of the outer shear-fork bracket is connected to an outer U-shaped connecting frame (8). A linear guide rails (9) is provided at both sides of the cross beam, separately. A sliding block (10) is provided at inner walls of the inner U-shaped connecting frame and the outer U-shaped connecting frame, separately. A lifting drive motor (11) is provided on a rear side plate of the outer U-shaped connecting frame, and a drive sprocket (12) is provided at an output end of the lifting drive motor. A transition sprocket (13) is provided at the inner side of the rear side plate. A sliding seat (14) is provided at the rear side of the cross beam. A tension sprocket (15) is mounted at the front side of the sliding seat. A chain (16) is wound on the drive sprocket, the transition sprocket, and the tension sprocket. One end of the chain is fixedly connected, and the other end is connected to an external connecting hinge pin (6). A horizontal drive motor (17) is provided on a front side plate of the outer U-shaped connecting frame. A gear is mounted on an output end of the horizontal drive motor, and the gear matches with a rack (18). The shear-fork type feeding device is simple in structure, can realize large material taking stroke, and the space occupation is smaller.
C: Provided are a seat and a bicycle having said seat; the seat comprises a seat body (6) and a U-shaped connection frame (7); said U-shaped connection frame (7) is fixedly connected to a seat frame (4); said seat body (6) is hingedly connected to the U-shaped connection frame (7); the U-shaped connection frame (7) is arranged horizontally; the distance between the two sides of the U-shaped connection frame (7) is greater than the thickness of the seat; the seat body (6) can turn over. Using the described seat, it is possible, upon parking the bicycle, to turn over the seat body and thus prevent the seat from getting wet in the rain and being exposed to the sun.
D: Disclosed is an efficient lock shackle machining device. The efficient lock shackle machining device comprises a rack (1). A horizontal plate (2) is fixedly connected to the rack (1); first guide wheels (3) and second guide wheels (4), which are provided with a gap therebetween, are rotationally arranged on one side of the horizontal plate (2); a rotary disc (7) is arranged on another side of the horizontal plate (2), a circular center fixing block (8) is fixed to the middle of the rotary disc (7), and a circular bending block (9), fixed to the rotary disc (7), is arranged on one side of the center fixing block (8); a guide pipe (10) fixed to the horizontal plate (2) is arranged between the gap and the rotary disc (7), an extension line at one end of the guide pipe (10) is aligned with the gap, and an extension line at the other end of the guide pipe (10) is arranged at a position between the center fixing block (8) and the circular bending block (9); and a cutting-off frame (11) is fixed to the horizontal plate (2), a connecting frame (13) is fixed to the top of the cutting-off frame (11) by means of a telescopic rod (12), a cutting-off cutter disc (14) and a grooving cutter disc (15) are rotationally connected to the connecting frame (13), and the grooving cutter disc (15) is located below the cutting-off cutter disc (14). The efficient lock shackle machining device not only can reduce the labor intensity for workers, but also has the advantages of having a high machining efficiency, a high yield and high conveying stability.
Answer: A