Please select the most similar patent number from A, B, C and D. Which number is?
A folding joint (2) for a baby carriage. The folding joint (2) comprises: an upper rotary disk (23) and a lower rotary disk (24) each provided with a positioning hole; a rotary disk positioning outer cover (22) and a rotary disk positioning inner cover (21) each provided with a positioning hole, wherein the two positioning holes are corresponding to the positioning hole of the upper rotary disk (23) and that of the lower rotary disk (24); a first traction cable (25), a second traction cable (26), and a stopping member (27) capable of preventing the upper rotary disk (23) and the lower rotary disk (24) from rotating. The upper rotary disk (23) and the lower rotary disk (24) each have a P-shaped swing lever, wherein the P-shaped swing lever of the lower rotary disk (24) is fixedly connected to front feet tubes (3) of the baby carriage, and the P-shaped swing lever of the upper rotary disk (23) is fixedly connected to handle tubes (1) of the baby carriage. The rotary disk positioning inner cover (21) and the rotary disk positioning outer cover (22) are fixedly connected to rear feet tubes (4) of the baby carriage. The folding joint (2) can avoid the hands from being cut or clamped during folding of the baby carriage, so that the infant-care parents can use the baby carriage more comfortably.
A: Disclosed is a large-joint structure of a baby carriage, the large-joint structure comprising a front foot assembly (1), a rear foot plate (2) and a handle (3). The front foot assembly (1) comprises a front foot plate (4) and a front foot housing (5), the handle (3) and the rear foot plate (2) are hinged to the front foot plate (4) correspondingly in the front foot housing (5), the handle (3) is provided with an inner cavity, the inner cavity of the handle (3) is provided with a first hinge (6), the first hinge (6) is provided with a handle latch hook (7), a first torsional spring (8) is arranged between the handle latch hook (7) and the inner cavity of the handle, and the handle latch hook (7) is fixedly connected to a pulling wire (9); a groove (41) is provided in an edge of a tail of the front foot plate (4), and the handle latch hook (7) is in movable clamping connection with the groove (41) of the front foot plate (4); a second hinge (10) is arranged on the front foot housing (5), the second hinge (10) is provided with a rear foot latch hook (11) and a rear foot latch hook seat (12), a second torsional spring (13) is arranged between the rear foot latch hook (11) and the rear foot latch hook seat (12), and a reset spring (14) is arranged between the rear foot latch hook seat (12) and the front foot housing (5); the rear foot latch hook (11) is in movable clamping connection with a limiting clamp groove (21) in the rear foot plate (2); and the front foot assembly (1) is synchronously locked with the handle (3) and the rear foot plate (2) and unfolded for linkage, such that the whole structure is compact, the manufacturing cost is effectively reduced, and the operation is more simple, convenient and quick.
B: A poultry offal taking out apparatus. An apparatus body (1), a leg separating device (2), a chest positioner (3), a wing positioner (4) and a chest pressing device (5) are sequentially mounted on a left guide rod (10) and a right guide rod (11); a track wheel (6) is arranged between an upper rotary disc (7) and a lower rotary disc (8); the left guide rod and the right guide rod are arranged on the outer side of the track wheel in parallel and fixed to the upper rotary disc and the lower rotary disc; the track wheel is of a cone structure, and a plurality of irregular tracks (9) are arranged on the track wheel in the circumferential direction; the apparatus body, the leg separating device, the chest positioner, the wing positioner and the chest pressing device are driven by the upper rotary disc and the lower rotary disc to rotate circumferentially; the apparatus body, the leg separating device, the chest positioner, the wing positioner and the chest pressing device respectively move up and down and swing on the left guide rod and the right guide rod along the tracks on the static track wheel. The apparatus body comprises a fixed arm (16) and a swinging arm (17); a clamping finger (33) capable of freely moving is arranged at the end of the swinging arm; water and gas channels are formed in the fixed arm and the swinging arm. Frictional damage of a clamping apparatus to the liver (109) is reduced, and the gastroesophagus (105) can smoothly enter an opening of the clamping finger.
C: Disclosed is a mechanical power outputting device, comprising a fitting seat (20), characterized in that a turntable (1) is hinged on the fitting seat (20), two U-shaped holes (2, 5) are provided on the turntable (1), a movable plate (14) is movably mounted in the U-shaped holes (2, 5), hooks (6, 11) are respectively provided on parts of the turntable (1) above or below the movable plate (14), a retractable arm (31) and balancers (15, 17) are mounted on the movable plate (14), a track guiding element (28) guiding the offset direction of the movable plate (14) is provided above the U-shaped holes (2, 5), the track guiding element (28) being mounted on the fitting seat (20), a snapping position (27) for controlling the rotation of the turntable (1) is further provided on the periphery of the turntable (1), and a snap (25) corresponding to the snapping position (27) is provided on the fitting seat (20). The retractable arm (31), the snap (25) and the track guiding element (28) are connected to a control box (26) to control the actions thereof. A protruding output shaft (24) is further provided on the turntable (1), and rollers (21, 22, 23) are respectively provided on the inner sides of upper and lower ends of the movable plate (14) and the balancers (15, 17). The mechanical power outputting device has a wide power range and a simple structure, can be driven in various manners and is convenient to use.
D: An electric-mechanical dual-control household smart lock, comprising a mechanical clutch structure and a smart electric control structure; the mechanical clutch structure comprises a lock cylinder (11), a rebound spring bolt (12), a first round rotation plate (13) and a fixed seat (14), the rebound spring bolt (12) is fixed onto the fixed seat (14), the end portion of the rebound spring bolt (12) extends out from the fixed seat (14), an arc-shaped guide rail (121) fitted with the first round rotation plate (13) is provided on one surface of the rebound spring bolt (12), the lock cylinder (11) is connected to the rebound spring bolt (12) by means of the first round rotation plate (13), a key is inserted into the lock cylinder (11) to rotate and drives the first round rotation plate (13) to rotate, and the end portion of the rebound spring bolt (12) retracts into the fixed seat (14); the smart electric control structure comprises a PCB board (21), a motor (22), a telescopic set (23) and a second round rotation plate (24), the PCB board (21) is electrically connected to the motor (22), one end of the telescopic set (23) is fixedly connected to the motor (22) and the other end of the flexible set (23) is fixedly connected to the second round rotation plate (24), an arc-shaped guide rail (121) fitted with the second round rotation plate (24) is provided on the other surface of the rebound spring bolt (12), the telescopic set (23) drives the second round rotation plate (24) to rotate, and the end portion of the rebound spring bolt (12) retracts into the fixed seat (14).
Answer: A