Please select the most similar patent number from A, B, C and D. Which number is?
A folding chair capable of being used as a walking stick comprises a main rod piece (20), two seat handles (30) and three supports (40). The bottom of the main rod piece (20) is provided with a plurality of first clip parts (261). The seat handles (30) are pivoted to the top of the main rod piece (20). The supports (40) are pivoted to the bottom of the main rod piece (20), and each of the rod pieces has two second clip parts (443). When the user unfolds the seat handles (30) and the supports (40), the first clip parts and the second clip parts are clipped together to keep the supports in the unfolded state, and the seat handles (30) are available for the user to sit on. When the seat handles (30) and the supports (40) are folded, the folding chair can be used as a walking stick.
A: A fastening structure for a drum-shaped housing (1) and support legs (2), and a vacuum cleaner. A first fastening part (51) is mounted on the drum-shaped housing (1), and at least one second fastening part (22) and a third fastening part (24) are mounted on the support legs (2). Each of the support legs (2) comprises a housing (21), the housing (21) having a lateral face (211) oriented toward the drum-shaped housing (1). The at least one second fastening part (22) and the third fastening part (24) are mounted separately on the lateral face (211), and the at least one second fastening part (22) extends from the lateral face (211), allowing a fastening space (221) to be formed between the at least one second fastening part (22) and the lateral face (211). When the support leg (2) fastens to the drum-shaped housing (1), a lower part of the drum-shaped housing (1) enters into the fastening space (221), and the first fastening part (51) and the third fastening part (24) interlock. Among the first fastening part (51) and the third fastening part (24), one of the parts is a fastening projection and the other part is a fastening aperture.
B: The present invention relates to a chassis structure and a quick release rack thereof. The chassis structure comprises a chassis body and one or more quick release racks. The chassis body is provided with a fixed frame. The fixed frame is provided with one or more slots, one or more first engaging parts, and one or more locking pieces. The first engaging part and the locking piece are provided in proximity to the slot. The quick release rack is mounted on the fixed frame. The quick release rack comprises a rack body and a clip element. The rack body is provided with a bottom plate and a second engaging part. The clip element is pivotally connected to the base plate. The rack body can be inserted into the slot. The second engaging part can be engaged with the first engaging part. The clip element can clip onto the locking piece. As such, achieved are the advantages that the chassis structure and the quick release rack are convenient to mount and unmount and the space for mounting the chassis body is reduced.
C: Disclosed is a walking stick chair, comprising a main stick (1), a seat assembly (2) and a folding support assembly (3). When the walking stick chair is folded up, the folding support assembly (3) thereof can fold up near a handle part (11), i.e. the entire centre of gravity is in the top half; therefore, a user is saved from swaying while using the support thereof and is also able to be stably supported on the ground, avoiding the safety problems in existing structures where encountering uneven ground and colliding with other objects causes a user to be trapped and fall.
D: A box (1) and buckle assemblies (25) thereof comprise a box body (10), a box cover (20), at least one buckle (30) and at least one connection piece (40) used for locking the box cover (20) and the box body (10). The connection piece (40) comprises a first end (42) and a second end (44) opposite to the first end (42). The first end (42) of the connection piece (40) is rotationally connected with one of the box body (10) and the box cover (20), and at least one clamping block (142) is arranged on the other one of the box body (10) and the box cover (20). The number of the buckles (30), the number of the connection pieces (40) and the number of the clamping blocks (142) are the same. The second end (44) of the connection piece (40) is rotationally connected with the buckle (30), and the buckle (30) comprises a clamping portion (38) capable of being clamped on the clamping block (142). The clamping portions (38) of the buckles (30) of the box (1) can be buckled with the clamping blocks (142), so that the box (1) can be buckled tightly. The buckles (30) are rotationally connected with the movable connection pieces (40), and the mobility of the buckles (30) during unlocking is enhanced, so that the box (10) is opened conveniently.
Answer: C