Please select the most similar patent number from A, B, C and D. Which number is?
A knee joint force line correction system, for use in wearing on a human knee joint and upper and lower thigh and calf positions, and comprising an upper brace assembly (300), a lower brace assembly (400), a first connection assembly (210), a second connection assembly (220) and a first adjustment mechanism (100A). The upper brace assembly (300), the lower brace assembly (400), the first connection assembly (210), the second connection assembly (220) and the first adjustment mechanism (100A) are enclosed to form a closed-loop structure. According to the knee joint force line correction system, by means of adjusting the first adjustment mechanism (100A), a brace forms a three-point force on the human leg to achieve the effect of correcting a force line. Moreover, the knee joint force line correction system has strong applicability and a good effect. The entire frame system has a simple structure and small volume and is lightweight. An elastic structure is used as a connection piece, which makes adjustment more convenient. The versatility is strong, and the costs are low.
A: A dummy for a sitting posture pressure comfort test, comprising: a head (1), upper arms (2), lower arms (3), a torso (4), upper legs (5), lower legs (6), hip joints, knee joints, shoulder joints and elbow joints. The head (1) is fixedly connected to the torso (4). The torso (4) is connected to the upper legs (5) by means of the hip joints. The upper legs (5) are connected to the lower legs (6) by means of the knee joints. The upper arms (2) are connected to the lower arms (3) by means of the elbow joints. The head (1), the upper arms (2), the lower arms (3), the torso (4), each upper leg (5) and lower leg (6) comprises, from the outside to the inside, an epidermal layer (8), a support layer (9) and an inner layer (10). The torso (4) and the upper legs (5) are each provided with a plurality of pressure sensors. A first center-of-gravity adjustment mechanism is provided inside the torso (4). The head (1), the upper arms (2), the lower arms (3), the upper legs (5) and the lower legs (6) are internally provided with a second center-of-gravity adjustment mechanism. The present dummy may be used as a standard test tool for comfort testing of a seat product, is capable of calculating seat structure size parameters and human body posture parameters of a comfortable sitting posture, and is capable of measuring structural ergonomics and human-machine interaction pressure parameters such as seat surface height, depth, hardness and body pressure distribution of a comfortable sitting posture.
B: A limiting adjustment linkage device and a lower limb support. The device comprises: a housing (10); a first bracket (20) provided on the housing (10); a second bracket (30) provided on the housing (10) and connected to the first bracket (20) by means of a reverse four-bar linkage (50), wherein the second bracket (30) moves relative to the first bracket (20) and the housing (10), respectively; and a limiting device (40) mounted on the housing (10) and located between the first bracket (20) and the second bracket (30), wherein when the first bracket (20) or the second bracket (30) moves relative to the housing (10), the limiting device abuts against the first bracket (20) and the second bracket (30) to limit the maximum amplitude of the movement of the first bracket (20) or the second bracket (30). By providing the lower limb support with the replaceable or adjustable limiting adjustment linkage device, the lower limb support can adjust a relative angle between upper and lower brackets according to the conditions of knee joints of different people, so that the lower limb support has stronger adaptability and is applicable to patients in different leg rehabilitation periods, thus reducing rehabilitation cost of the patients.
C: A lens fine adjustment apparatus (1000), a lens adjustment module (2000), and a projection device. The lens fine adjustment apparatus (1000) comprises a first support (600) and a second support (110) which are adjustably and movably connected, and the lens fine adjustment apparatus (1000) also comprises a plurality of position adjustment mechanisms (700) used for adjusting the relative positions of the first support (600) and the second support (110), and various position adjustment mechanism connection assemblies and adjustment assemblies. The connection assemblies movably connect the first support (600) and the second support (110), and the adjustment assemblies apply forces causing one of the first support (600) and the second support (110) to move with respect to the other. The present invention provides ample freedom of adjustment for lens position adjustment, and has a high adjustment accuracy and a rapid adjustment means.
D: A projection device position adjusting bracket (100). The projection device position adjusting bracket (100) comprises a fixing base (110), a first adjusting mechanism (130), and a second adjusting mechanism (140). The fixing base (110) is used for fixing a projection device (160), and a first transmission member (116) is fixedly connected to the fixing base (110). The first adjusting mechanism (130) is provided on a side of the fixing base (110) close to the first transmission member (116); the first adjusting mechanism (130) comprises a first adjusting base (131), a first driving assembly (133), and a second transmission member (137), and the first driving assembly (133) is transmittingly connected to the first transmission member (116) so as to drive the fixing base (110) to rotate around a first shaft (101). The second adjusting mechanism (140) is located on a side of the first adjusting mechanism (130) facing away from the fixing base (110); the second adjusting mechanism (140) comprises a second adjusting base (141) and a second driving assembly (143), and the second driving assembly (143) is transmittingly connected to the second transmission member (137); the second transmission member (137) drives the first adjusting base (131), and the first adjusting base (131) drives the fixing base (110) to do a lifting/lowering motion or a pitching motion.
Answer: B