Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed are a return device and a windproof roller shutter. The return device comprises an end cover (10), a sliding component (21) and a fixing plate (20), wherein the end cover (10) is provided with a sliding slot (131); the sliding slot (131) is obliquely disposed; the horizontal height of a first end of the sliding slot (131) is higher than that of a second end of the sliding slot (131); the sliding component (21) moves along the sliding slot (131); the fixing plate (20) is mounted at one end of a roller tube (50); and the sliding component (21) is mounted on the fixing plate (20). The windproof roller shutter comprises the roller tube (50), a shutter body (60), a lower rail (55), two side rails (40) and two return devices. The return device can effectively reduce friction between the shutter body and the side rails when the shutter body is raised or lowered so as to ensure that the windproof roller shutter can be raised or lowered smoothly.
A: Disclosed is an opening and closing structure for a cosmetic container, comprising a shell (10) and a middle binding core (20). The shell (10) comprises an outer cover (11), an inner cover (12), a middle ring (13) and a bottom cover (14). A side wall at a lower part of the outer cover (11) is provided with a first sliding groove (111) along the axial direction. The inner cover (12) is sheathed in the lower part of the outer cover (11). A side wall of the inner cover (12) has a first sliding column (121) provided in the first sliding groove (111) in a sliding manner. An inner wall of the middle ring (13) is provided with a first spiral groove (131), and is sheathed on the lower part of the outer cover (11) in a rotating manner, so that the first sliding column (121) is provided in the first spiral groove (131) in a sliding manner. An upper edge of the bottom cover (14) is connected to a lower edge of the outer cover (11) in a fixed manner. The middle binding core (20) is stuck in an inner cavity formed by the bottom cover (14) and the inner cover (12). By rotating the middle ring (13), the middle binding core (20) is automatically ejected downwards, and can automatically return to the shell (10) by directly pressing the bottom after use, thereby breaking through the traditional method of use whereby a cover is pulled out, and increasing the overall simplicity and convenience.
B: An electronic device (200) and a folding mechanism (100). The folding mechanism (100) comprises a first supporting member (10), a second supporting member (20), a bendable fixing assembly (30), a connecting assembly (40), a first sliding assembly (50), and a second sliding assembly (60). The first supporting member (10) is provided with a first sliding slot (11). The second supporting member (20) is provided with a second sliding slot (21). Two opposite sides of the fixing assembly (30) are respectively fixed on the first supporting member (10) and the second supporting member (20). The connecting assembly (40) is fixed on the fixing assembly (30), and the connecting assembly (40) comprises a connecting rotating shaft (41). The first sliding assembly (50) comprises a first sliding portion (51) and a first rotating portion (52); the first sliding portion (51) is mounted in the first sliding slot (11) and is slidable with respect to the first supporting member (10); the first rotating portion (52) is rotatably mounted on the connecting rotating shaft (41). The second sliding assembly (60) comprises a second sliding portion (61) and a second rotating portion (62); the second sliding portion (61) is mounted in the second sliding slot (21) and is slidable with respect to the second supporting member (20); the second rotating portion (62) is rotatably mounted on the connecting rotating shaft (41).
C: Provided is a roller shutter which is convenient to mount, comprising a roller shutter body (1) with a reel pipe (2), wherein a positioning sleeve (41) embedded in the reel pipe (2) and a retractable fixing assembly (4) located in the positioning sleeve are arranged on at least one end of the roller shutter body (1); the positioning sleeve (41) is fixedly connected to the reel pipe (2); the positioning sleeve (41) and the retractable fixing assembly (4) can rotate in a relative manner; and the retractable fixing assembly (4) comprises a self-locking retractable mechanism and a retaining plug assembly for bearing against a wall surface to increase a friction force. The roller shutter is convenient to mount and dismount, and the distance between fixed points at two sides of the roller shutter can be adjusted according to the width of a window.
D: An interventional instrument assistive control member (100) for positioning an interventional instrument (200). The interventional instrument assistive control member (100) comprises a supporting frame (10) and at least one sliding assembly (20); the interventional instrument (200) is detachably connected to the sliding assembly (20); the supporting frame (10) comprises a sliding guide rod (13); the sliding guide rod (13) is provided with at least one gear rack (131) along the length direction of the sliding guide rod; the sliding assembly (20) comprises a sliding block (21) and an adjustment mechanism (23) detachably provided on the sliding block (21); the adjustment mechanism (23) comprises a limiting portion (235) and a gear (234) fixedly connected to the limiting portion (235); when the sliding assembly (20) is mounted on the sliding guide rod (13), the sliding block (21) is sleeved on the sliding guide rod (13), the gear (234) is engaged with the gear rack (131), and the limiting portion (235) is limited between the sliding guide rod (13) and the sidewall of the sliding block (21); and when the sliding assembly (20) is separated from the sliding guide rod (13), the adjustment mechanism (23) can be separated from the sliding block (21). Further provided is an interventional medical system comprising the interventional instrument (200) and the interventional instrument assistive control member (100).
Answer: C