Please select the most similar patent number from A, B, C and D. Which number is?
Provided is a tire self-rescuing recovery device, mainly comprising a recovery boot (1), a diagonal member (2), a hook connecting base (4) and a hook (5). The recovery boot (1) is of a housing consisting of an arc-shaped plate (1-3) at the top, end plates (1-4) at two ends and side plates (1-5) on two sides, wherein a lower part of the housing is opened, and an outer side of a tire can be clamped by the housing to form a bulge. Two diagonal members (2) are fixed on a side plate (1-5) on one side. The recovery boot (1), the two diagonal members (2) and the hook connecting base (4) form a triangular bracket. A through hole (4-1) passing through the upper side and the lower side is formed in the middle of the hook connecting base (4). A hook rod of the hook (5) passes through the through hole (4-1). An upper section of the hook rod is a screw rod (5-1). A fastening screw nut (3) is arranged at a part of the screw rod (5-1) extending out of the through hole (4-1) and positioned above the hook connecting base (4). A lower end of the hook (5) adopts a hook head (5-2) which faces towards an inside of the side plate (1-5). The present device is convenient to mount and dismount, and can be applied to automobile tire recovery.
A: An adjustable ditching apparatus of an agricultural machine, comprising a fixed stand column (1). A ditching shovel fixing plate (2) is fixedly installed on the outer surface of one side of the fixed stand column (1), two locking screws (3) are movably installed on the inner side of the ditching shovel fixing plate (2), a ditching shovel (4) is arranged on the upper surface of the ditching shovel fixing plate (2), a soil dividing plate (5) is fixedly installed on the upper surface of the ditching shovel (4), two locking nuts (6) are fixedly installed on the upper surface of the ditching shovel (4) located on the outer side of the soil dividing plate (5), an adjusting slot (7) is provided on the inner side of the ditching shovel (4), a support connecting base (8) is fixedly installed on the outer surface of the other side of the fixed stand column (1), a roller support (9) is arranged on the outer surface of one side of the support connecting base (8), a movable roller (10) is rotationally installed on the inner side of the roller support (9), an adjusting support (11) is fixedly installed at the outer surface of the other side of the fixed stand column (1) above the support connecting base (8), an adjusting screw rod (12) is threadedly installed on the inner side of the adjusting support (11), a connecting ball head (13) is fixedly installed on the outer surface of the lower end of the adjusting screw rod (12), and a pulling frame (14) is fixedly installed on the outer surface of one side of the fixed stand column (1) above the furrowing blade fixing plate (2). The adjustable ditching apparatus of the agricultural machine can adjust the ditching depth and the supporting height of the movable roller, and can meet the requirements for different ditching depths on different types of land.
B: Disclosed is a control mechanism for a dynamic balancing vehicle installed on the dynamic balancing vehicle. The dynamic balancing vehicle comprises a vehicle body and a steering mechanism disposed on the vehicle body. The control mechanism comprises a post (1), a connecting seat (2), a leg-controlling pad (3), a handle (4) and a grip (5). A sliding space is formed inside the post (1) for the handle (4) to slide, and the sliding space has a first position and a second position. An upper end of the post (1) is connected to the connecting seat (2), a lower end of the post (1) is connected to a steering mechanism, and when the post (1) turns, the steering mechanism is driven to turn so as to control the steering of the vehicle body. The connecting seat (2) is formed with an opening thereon, through which the handle (4) is inserted into the sliding space. The leg-controlling pad (3) is connected at two sides of the connecting seat (2) and drives the post (1) to turn. The handle (4) is telescopically slidable along the sliding space and limited therein to slide between the first position and the second position. The grip (5) is connected to the handle (4) and drives the post (1) to turn, and the position of the grip (5) is adjusted through the handle (4). The control mechanism is applicable to hand-operation and leg-operation at the same time.
C: Disclosed is a portable escape device (30) for self-rescue in the case of an auto tyre being trapped in a pit, comprising support posts (36, 12), a clamping device (38, A) fitted to the support posts (36, 12), and a jacking device (40, B) fitted to the clamping device (38, A). The support posts (36, 12) is fixedly mounted onto spokes (32, 2). The clamping device (38, A) clamps onto an auto tyre (1). The jacking device (40, B) protrudes and extends out of a top face of a tyre portion (34). The portable escape device (30) for self-rescue in the case of an auto tyre being trapped in a pit can release the trapped auto tyre and perform self-rescue fast and reliably, and is convenient to carry.
D: An easy curtain hook comprises an air bag (1), a main frame (2), attachment teeth (3), a retaining bar (4) and a hook (5). The attachment teeth (3) are arranged at a lower end surface of the main frame (2) to attach to a curtain fabric, preventing the hook (5) from falling, and enhancing attachment. The retaining bar (4) is fixed at a right end of the main frame (2). The hook (5) is arranged above the retaining bar (4). A left portion of the hook (5) is arranged at a middle position of an upper end of the air bag (1) to realize self-locking of the hook (5), facilitating detachment of the hook (5), reducing labor, and enabling secure fastening.
Answer: C