Please select the most similar patent number from A, B, C and D. Which number is?
A concealed connection structure for profiled beams and columns comprises a profiled column (1), and a profiled beam (2) perpendicularly connected to the profiled column (1). An upper plug (3) and a lower plug (4) are pre-arranged in a T-shaped groove on one side of the profiled column (1). A retractable connection-locking mechanism is arranged in a cavity of the profiled beam (2); said retractable connection-locking mechanism extends into the T-shaped groove on the side of the profiled column (1) and fits to the upper plug (3) and the lower plug (4). The connection structure allows convenient assembly and disassembly, and features high rigidity and stability at the joint.
A: A connecting structure for an embedment-type composite profile comprises a standing column (1) and a beam (2, 3) which are in forms of thin-wall column bodies formed by staggered embedding of elongated members. The standing column (1) and the beam (2, 3) are vertically connected through a connecting joint (4, 5) which comprises a bottom plate (41, 51) and a lug boss (42, 52). The lug boss (42, 52) is provided with a hole cavity (421,521) along the direction vertical to the bottom plate (41, 51). The lug boss (42, 52) and the beam (2,3) are connected by insertion matching, and the bottom plate (41, 51) and the side wall of the standing column (1) are connected through a fastener. The outer side wall of the standing column (1) is provided with a convex rib (11, 13) along the length direction, and the bottom of the bottom plate (41, 51) is provided with a guide groove (412, 511) capable of being matched by the convex rib (11, 13). The outer side wall of the standing column (1) is also provided with a protrusion (12, 14) propped against the lower edge of the bottom plate (41, 51). By using the vertical connection through the detachable connecting joint (4, 5) and the connection between the bottom plate (41, 51) of the connecting joint (4, 5) and the standing column (1) through a profiled bolt (7), not only a detachable connection can be realized, but also a tight joint between the double side walls of the standing column (1) of the composite structure can be ensured, thus providing a seamless connection between the double side walls of the standing column (1) and remarkably improving the strength and rigidity of the standing column (1).
B: The present invention relates to a quick-adjusting locking mechanism, comprising a long and hollow profile frame body. The profile frame body is provided with a positioning groove arranged along the axial direction thereof and positions glass. The upper end at one side of the glass is fixedly provided with a locking profile. The locking profile is located in the positioning groove. The top part of the profile frame body is detachably clamped with a cover plate body. The cover plate body and the locking profile are matched and clamped for use in adjusting and positioning the position of the glass on the profile frame body. The present invention is simple in structure and convenient to use. The cover plate body and the locking profile match and are clamped to adjust and position the position of the glass on the profile frame body, and the positional relationship between the glass and the profile frame body may be adjusted according to the actual assembly situation, which has a wide range of applications.
C: A frame forming structure for use with a frame and sash of an aluminum–wood combined door and window, the door and window at least comprising a door and window frame or a door and window sash and frame: the door and window frame or the door and window sash and frame is formed by connecting adjacent sectional frame bars (1) by means of an angle forming device (2) and a circular tenon rod (3) on adjacent connection end surfaces; connection end surfaces of two adjacent sectional frame bars (1) are manufactured to oppose an end plane of a normal sectional frame bar to assume a 0-60° cross section, respectively, and are mutually connected to form a perpendicular frame edge; the connection end surfaces of the two sectional frame bars (1) are processed to be provided thereon with a symmetrical U-shaped groove (4), which is used for positioning the angle forming device, and circular tenon rod hole (5), respectively; a circular tenon rod (6), which is used for positioning, is inserted into the circular tenon rod hole (5); after the adjacent sectional frame bars (1) are mutually coupled, a space (7) which is used for accommodating the assembly-type angle forming device (2) is formed at a coupling location, the assembly-type angle forming device (2) being formed by means of combining two halves of the angle forming device (21), wherein the two halves of the angle forming device (21) are each fixed in a corresponding U-shaped groove (4), which is used for positioning a sectional frame bar, by using a screw (22), and the two halves of the angle forming device (21) are mechanically tightened by means of a bevel gear pair mechanism, which is paired in a three-pronged engagement, to tightly fix and connect the two adjacent sectional frame bars (1). The present invention has the features of being capable of increasing connection strength at angle portions, increasing sealing performance after angle formation, improving the convenience of frame forming, increasing productivity, and the like.
D: A display lightbox comprises profiles (1) forming a frame, and LED strip lights (2) disposed at an inner side of the frame. The display light box further comprises a corner connector (3) and a fastener member (4). Each corner of the frame is formed by joining and engaging two of the profiles (1). The profiles (1) have line symmetry and, from the center to two sides thereof, are sequentially provided with a first cavity (1-1), a second cavity (1-2), and a fabric insertion recess (1-3). The corner connector (3) has one end serving as a fixed end (3-1) and another end serving as a fastening end (3-2). The fastening end (3-2) is provided with a fastening notch (3-3), and shapes of the fixed end (3-1) and the fastening end (3-2) of the corner connector (3) match a shape of the first cavity (1-1). The fixed end (3-1) of the corner connector (3) is inserted into and fixed to the first cavity (1-1) of one profile (1) at a corner. The fastener member (4) is fixedly connected to the other profile (1) at the corner, and when the two profiles (1) at the corner are joined together, the fastening end (3-2) of the corner connector (3) is inserted into the first cavity (1-1) of the other profile (1) at the corner, and the fastener member (4) is fastened to and fixed within the fastening notch (3-3). The display lightbox has a clean design, and is aesthetically pleasing and easy to assemble and disassemble.
Answer: A