Connecting piece and bed frame with same

Abstract

The utility model relates to a connecting piece and a bed frame. The connecting piece comprises a first part, a matching surface is arranged on the first side of the first part in the first direction, and the matching surface comprises two plane parts and a concave surface part. The two plane parts are arranged at intervals in the second direction and are basically coplanar. The second direction is perpendicular to the first direction. The concave surface portion is located between the two flat surface portions in the second direction, and is recessed from the two flat surface portions toward a second side in the first direction to form two bead portions at a junction with the two flat surface portions. The first side and the second side are opposite in a first direction. The concave surface part is provided with a connecting part. When the pipe fitting needing to be connected is a square pipe, the two plane portions of the matching face make contact with the pipe wall of the square pipe, and connection of the square pipe is achieved. When the pipe fitting needing to be connected is a circular pipe, the two convex edge parts of the matching surface make contact with the outer surface of the circular pipe, meanwhile, the concave surface part provides secondary positioning for the outer surface of the circular pipe, the connecting part is matched with a fastener, and connection of the circular pipe is achieved.

Description

Technical Field

[0001] This utility model relates to the field of pipe fittings, and in particular, to a connector that can connect both square and round pipes, and a bed frame including the connector. Background Technology

[0002] Some bed frames consist of legs and a frame, which are often tubular components that require fasteners such as screws to connect them. During the assembly of a bed frame, it is often necessary to connect tubular components with different cross-sectional shapes, such as round or square tubes.

[0003] However, different connectors are often used to connect pipes with different cross-sectional shapes. This requires manufacturers to produce and stock different materials, i.e., different connectors. This not only leads to low production efficiency and high manufacturing costs for pipe frames, but also hinders factory management of connectors and may cause assembly problems for users. Therefore, a connector suitable for connecting pipes with different cross-sectional shapes is needed. Utility Model Content

[0004] One objective of this invention is to provide a connector that can connect both square and round tubes. This connector is simple in construction and easy to manufacture.

[0005] This connector is used to connect a first pipe fitting to a second pipe fitting. The connector includes a first portion with a mating surface on a first side in a first direction. The mating surface includes two planar portions and a concave portion. The two planar portions are spaced apart and substantially coplanar in a second direction, wherein the second direction is perpendicular to the first direction. The concave portion is located between the two planar portions in the second direction and is recessed from the two planar portions toward the second side in the first direction to form two protruding ridges at the junction with the two planar portions, wherein the first side and the second side are opposite to each other in the first direction. The concave portion is provided with a connecting portion.

[0006] It should be noted that the term "mating surface" can refer to a surface, body or other equivalent technical means used to mate with a pipe fitting, rather than being intended to define a surface without thickness.

[0007] It should also be noted that the description "the two planar portions are spaced apart and substantially coplanar in the second direction" can mean that the planes containing the two planar portions are parallel to each other, and the distance between these two parallel planes is negligible compared to the distance between the two planar portions in the second direction.

[0008] In this embodiment of the invention, the connector can connect pipes with different cross-sectional shapes. When the pipe to be connected is a square pipe, the two flat portions of the mating surface contact and position with the wall surface of the square pipe, and the connecting portion engages with the fastener to achieve the connection. When the pipe to be connected is a round pipe, the two protruding portions of the mating surface contact and position with the wall surface of the round pipe, the concave portion provides secondary positioning for the wall surface of the round pipe, and the connecting portion engages with the fastener to achieve the connection.

[0009] In one example, in the second direction, the distances from the connecting portion to the two protruding portions are H1 and H2, respectively, and 0.4 ≤ H1 / H2 ≤ 0.6.

[0010] In conjunction with the first aspect, in this embodiment of the invention, the connecting portion is disposed in the second direction relative to the two planar portions, at a position near the center of the concave portion. When the connecting portion is subjected to force, the force can be uniformly transmitted at least in the mating surface, thereby avoiding the adverse effects of residual stamping stress in the connecting member on the connecting member, making the connection more stable.

[0011] In one example, the concave surface is provided with a plurality of connecting portions, which are spaced apart in a third direction, and the third direction is perpendicular to both the first direction and the second direction.

[0012] In one example, the connecting portion includes at least three connecting portions, which are non-uniformly arranged in the third direction.

[0013] It should be noted that the description "non-uniformly arranged in the third direction" means that, in the third direction, the maximum and / or minimum distances from the plurality of connecting parts to the top of the first part are not necessarily a non-arithmetic sequence, rather than intended to exclude the case where the maximum and / or minimum distances from the plurality of connecting parts to the top of the first part are an arithmetic sequence. In other words, technical solutions where the distances between adjacent connecting parts are equal are also included within the protection scope of this utility model.

[0014] In one example, the connecting portion includes a first connecting portion, a second connecting portion, a third connecting portion, and a fourth connecting portion. The second connecting portion may be a connecting portion adjacent to the first connecting portion in a third direction, with a maximum distance D1 from the first connecting portion to its apex in that third direction. The third connecting portion may be a connecting portion adjacent to the second connecting portion in a third direction, located on the side of the first connecting portion away from its apex, with a minimum distance D2 from the apex in that third direction. The fourth connecting portion may be a connecting portion adjacent to the third connecting portion in a third direction, located on the side of the third connecting portion away from its apex, with a minimum distance D3 from the apex in that third direction. Here, D1 ≤ 25 mm, D2 > 30 mm, and D3 > 40 mm.

[0015] In one example, the connector may include a plurality of connectors spaced apart in the third direction. The plurality of connectors can be adapted to connect pipe fittings of different sizes, and further, can be adapted to connect multiple pipe fittings. By providing at least three of the connectors non-uniformly arranged in the third direction, and specifically by setting the maximum and / or minimum distances from each connector to the top end corresponding to the sizes of commonly used square pipes on the market (20mm×25mm, 20mm×30mm, and 20mm×40mm), the connector can be adapted to connect commonly used pipe fittings on the market. Furthermore, the connector can be adapted to connect multiple commonly used pipe fittings on the market.

[0016] In one example, the connecting portion is a blind hole or a through hole with internal threads, or a through hole through which a fastener passes in the first portion, or a connecting protrusion extending toward the first side.

[0017] In one example, the connector is formed by stamping and / or bending a steel plate member.

[0018] In one example, the connector further includes two second portions that are spaced apart in the second direction, connected to the first portion, and protruding from the first portion toward the second side in the first direction.

[0019] In one example, each second part has a first segment and a second segment arranged in a third direction, which is perpendicular to both the first and second directions. The first segment has a dimension of D4 in the first direction, and the second segment has a dimension of D5 in the first direction, where D4 > D5.

[0020] In one example, the two second portions, together with the first portion, form an open cavity capable of receiving the first fitting. The two second portions can be fixedly connected to the first fitting received by the cavity. The dimensional difference between the first and second segments arranged in the third-direction orientation in the first direction saves material while achieving a fixed connection and facilitates visual positioning during the fixing process.

[0021] Another objective of this invention is to provide a bed frame. This bed frame includes the aforementioned connectors, and therefore has an optimized stress distribution on the tubing, lower manufacturing and management costs, and a simple structure that is easy to assemble.

[0022] The bed frame includes the connector as described above, a first tube fixedly connected to the connector, a second tube abutting against the mating surface, and a fastener for securing the second tube to the connector by means of the connecting portion.

[0023] In one example, the second fitting is a square tube, the length direction of which is perpendicular to both the first and second directions. The square tube has a tube wall surface facing the mating surface, and the tube wall surface is attached to and pressed against the two planar portions.

[0024] In one example, the second tube is a circular tube, the length direction of which is perpendicular to both the first and second directions, and the circular tube has an outer surface, with the two protruding ridges pressed against the outer surface of the circular tube.

[0025] In one example, the concave portion is a partially cylindrical surface, the diameter of which is smaller than the diameter of the outer surface of the circular tube.

[0026] In one example, when multiple first pipe fittings are fixedly connected to a connector having multiple connecting portions, a second pipe fitting can be simultaneously connected to multiple first pipe fittings via the fastener. When multiple first pipe fittings are disposed on different pipe wall surfaces / outer surfaces of a second pipe fitting, the staggered connecting portions can achieve connection between the same second pipe fitting and multiple first pipe fittings via the fastener.

[0027] In one example, multiple first fittings connected to the same second fitting are in the same horizontal position.

[0028] In one example, multiple first fittings connected to the same second fitting are in different horizontal positions.

[0029] The connector and bed frame provided by this utility model have a mating surface comprising two flat portions and one concave portion. When the mating surface of the connector is connected to the second pipe, if the second pipe is a square pipe, it presses against the two flat portions of the mating surface, and the first pipe and the second pipe are connected to the fastener through the connector; if the second pipe is a round pipe, it presses against the two convex portions of the mating surface, and the first pipe and the second pipe are connected to the fastener through the connector. This ensures that the connector can connect both square and round pipes, offering advantages in warehouse management and general connections. The positioning of the connector with the two flat portions and the connector with the two convex portions optimizes the stress distribution of the support pipe assembly using this connector, while the bed frame structure using this connector and support pipe assembly is simple, easy to assemble, and has a small volume. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0031] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope of the present invention.

[0032] It should also be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0033] It should also be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0034] Figure 1A This is an exploded view of a bed frame.

[0035] Figure 1B This is an exploded view of another type of bed frame.

[0036] Figure 2 This is a schematic diagram of a bed frame using the connector of the first embodiment of this utility model.

[0037] Figure 3 yes Figure 2 A partial exploded view of section E of the middle bed frame.

[0038] Figure 4A It shows observations from multiple perspectives. Figure 2 A schematic diagram of the middle connector.

[0039] Figure 4B It is connected to a square tube. Figure 4A A schematic diagram of the connecting parts.

[0040] Figure 4C It is connected to a circular tube. Figure 4AA schematic diagram of the connecting parts.

[0041] Figure 5 This is a structural schematic diagram of the connector according to the second embodiment of the present invention.

[0042] Figures 6A-6C It is for connection with square tubes of different sizes. Figure 5 The diagram shows the structure of the connector.

[0043] Figure 7 Through Figure 5 A schematic diagram of the structure of multiple pipe fittings connected together by connectors. Detailed Implementation

[0044] The embodiments of the present invention will now be described by way of example with reference to the accompanying drawings. It should be understood that there are many ways to implement the present invention, and it should not be limited to the embodiments described below. The embodiments described below are only for a more thorough and clear understanding of the present invention.

[0045] Figure 1A and Figure 1B These are exploded view diagrams of two different bed frame designs. See also... Figure 1A The bed frame 1 includes a frame 20 and legs 30. The frame 20 includes a slatted frame 201 and a side frame 202. The side frame 202 includes multiple square tubes, each with an opening 202A on its surface near both ends. The legs 30 are square tubes. The square tubes of the side frame 202 are connected to the legs 30 via connectors 10, with the length direction of the legs 30 perpendicular to the plane of the side frame 202. The connector 10 can be a U-shaped metal sheet. The connector 10 is fixedly connected to the tube wall surface of the legs 30 at its U-shaped cross-section. The bottom of the connector 10 has a hole 10A. When the connector 10 is fixedly connected to the legs 30, the plane of the bottom of the connector 10 is parallel to the length direction of the legs 30. Fasteners such as bolts are used to pass through the openings 202A of the square tubes of the side frame 202 and the hole 10A of the connector 10 to connect the side frame 202 (i.e., the frame 20) to the legs 30 via the connectors 10.

[0046] See Figure 1BThe bed frame 1 includes a frame 20 and legs 30. The frame 20 includes a slatted frame 201 and a side frame 202. The side frame 202 includes multiple square tubes, each with an inwardly extending threaded hole 202A at both ends. The legs 30 are circular tubes. Openings 30A are provided on the surface of the tube wall of the legs 30. The square tubes of the side frame 202 are connected to the legs 30 via connectors 10, with the length direction of the legs 30 perpendicular to the plane of the side frame 202. The connector 10 can be a double-hole nut plate with openings 10A. The metal plate of the connector 10 is fixedly connected to the end of the square tube of the side frame 202. When the connector 10 is fixedly connected to the end of the square tube of the side frame 202, the axis of the hole in the nut of the connector 10 is perpendicular to the length direction of the legs 30. Fasteners such as screws are used to sequentially pass through the opening 30A of the leg 30, the opening 10A of the nut of the connector 10, and the threaded hole 202A of the square tube to connect the frame 202 (i.e. the frame 20) to the leg 30 via the connector 10.

[0047] It should be noted that the description "the plane in which the frame 202 is located" can refer to the plane in which the planes of at least four of the frame 202's tubes are substantially coplanar. For a bed frame that has been fully connected, the plane in which the frame 202 is located can be the plane in which the surfaces of the tubes of the frame 202 are located, perpendicular to the length direction of the legs 30.

[0048] In the past, different connectors 10 were used when connecting pipes with different cross-sectional shapes. This not only resulted in low production efficiency and high manufacturing costs for the bed frame, but also indirectly increased the management costs of the connectors.

[0049] In view of this, a bed frame using the connector described in the embodiments of this utility model is provided. Figure 2 This is a schematic diagram of a bed frame using connectors. Figure 3 yes Figure 2 A partial exploded view of section E of the bed frame shown. See also... Figure 2 and Figure 3 The bed frame 1 includes a frame 20 and legs 30. The frame 20 includes a slatted frame 201 and a side frame 202. The slatted frame 201 comprises multiple parallel-arranged metal square tubes, but can also be made of materials such as bentwood, solid wood, or plastic. The slatted frame 201 is connected to the side frame 202 at its edges to be supported by the side frame 202, at least in the direction of gravity. The side frame 202 comprises multiple square tubes. The legs 30 are square tubes. At least a portion of the square tubes of the side frame 202 are connected to the legs 30 via connectors 10, and the length direction of the legs 30 is perpendicular to the plane of the side frame 202.

[0050] Figure 4A yes Figure 2The schematic diagram of the connector 10 used in the embodiment of this utility model shown includes a perspective view, a right view, and a front view of the connector 10 in the first embodiment of this utility model. The right view schematically labels the first direction A, the second direction B, and the third direction C. See also... Figure 4A The connector 10 includes a first portion 11, wherein the first portion 11 has a mating surface 110 on a first side in a first direction A (i.e., the side pointed to by the first direction A in the right view). The mating surface 110 includes two planar portions 111 and a concave portion 112. The two planar portions 111 are spaced apart and substantially coplanar in a second direction B, which is perpendicular to the first direction A. The concave portion 112 is located between the two planar portions 111 in the second direction B and is recessed from the two planar portions 111 toward a second side in the first direction A (i.e., the side opposite to the side pointed to by the first direction A in the right view) to form two protruding ridges 113 at the junction with the two planar portions 111. The concave portion 112 is provided with a connecting portion 114.

[0051] The planes on which the two planar portions 111 are located are both perpendicular to the first direction A, and the distance between the planes on which the two planar portions 111 are located is negligible compared to the distance between the two planar portions 111 in the second direction B.

[0052] In this embodiment of the invention, the cross-sectional shape of the two planar portions 111 observed in the third direction C is not limited, as long as the planes where the two planar portions 111 are located are both perpendicular to the first direction A.

[0053] The concave portion 112 has a connecting portion 114. The connecting portion 114 is located near the center of the concave portion 112 relative to the two planar portions 111 in the second direction B. The connecting portion 114 is configured to engage with a fastener to complete the pipe connection. When the mating surface 110 of the connector 10 is connected to the second pipe, the fastener engages with the connecting portion 114, and the connecting portion 114 is thus subjected to force. Because the connecting portion 114 is located near the center, the force can be evenly transmitted at least in the mating surface 110, thereby avoiding the adverse effects of residual stress in the connector 10, especially in the concave portion 112 formed by stamping, on the pipe connection, resulting in a more stable connection.

[0054] It should be noted that the description that "the connecting portion 114 is located in the second direction B, relative to the two planar portions 111, at a position near the center in the concave portion 112" does not strictly limit the position of the connecting portion 114, as long as it can achieve uniform force transmission in the mating surface 110. Preferably, in the second direction B, the distances from the connecting portion 114 to the two convex portions 113 are H1 and H2, respectively, and 0.4 ≤ H1 / H2 ≤ 0.6.

[0055] The connecting part 114 can have various forms, as long as it can be used to connect the pipe fittings. Optionally, the connecting part 114 can be a hole such as a blind hole or a through hole with internal threads for fasteners to pass through to connect the pipe fittings; it can also be a connecting protrusion such as a threaded post protruding towards the first side.

[0056] Preferably, the connecting part 114 is a threaded hole.

[0057] Figure 4B yes Figure 4A The diagram shows the structure when the connector is connected to the second fitting of the square tube. Figure 4B The diagram schematically marks a first direction A, a second direction B, and a third direction C. When the mating surface 110 of the connector 10 is connected to the square tube, the two flat portions 111 press against the tube wall surface of the square tube. Since the two flat portions 111 are spaced apart in the second direction, they only apply force to both sides of the tube wall surface. Commonly available square tubes are thin-walled fittings, with thicker walls on both sides and thinner walls in the middle. The force application position of the two flat portions 111 can prevent the thin-walled square tube from deforming during connection, thus effectively extending the service life of the square tube.

[0058] The concave portion 112 is located between the two planar portions 111 in the second direction B. In a plan view viewed along the third direction C, the concave portion 112 may be arc-shaped. The third direction C is perpendicular to both the first direction A and the second direction B. When the mating surface 110 of the connector 10 is connected to a square tube, at least part of the concave portion 112 is not completely in contact with the tube wall surface of the square tube. This results in an arched gap 1121, as observed in the third direction C, between the concave portion 112 and the tube wall surface of the square tube. In actual production, the concave portion 112 of the connector 10 is usually formed by stamping, and residual stress often exists in the concave portion 112, making it prone to deformation under external force. The arched gap 1121 provides allowance for this deformation, which not only makes the connection between the tubes more stable but also extends the service life of the connector 10. In other words, during the bed frame connection process, the concave portion 112 is locked in place by the cooperation of the connecting part 114 and the fasteners to gradually fit the second tube, which is a square tube, and form an arch structure. This arch structure is more robust than the traditional fully fitted curved surface.

[0059] Due to the positional relationship between the connecting part 114 and the two planar parts 111, when the mating surface 110 of the connector 10 is connected to the second pipe fitting which is a square pipe, the force vector of the connector 10 forms a relatively stable isosceles triangle, which further prevents deformation of the connector and improves the stability of the connection.

[0060] Optionally, the connection between the connecting part 114 and the corresponding fastener 43 can be a detachable connection or a non-detachable connection.

[0061] Figure 4C Is using Figure 4A The diagram shown illustrates the structure when the connector is connected to the second fitting, which is a circular tube. Figure 4C The diagram schematically marks a first direction A, a second direction B, and a third direction C. When the mating surface 110 of the connector 10 is connected to the circular tube, the two protruding ridges 113 press against the tube wall surface. Viewed in the third direction C, the protruding ridges 113 are smooth curves. Since the two protruding ridges 113 are formed by the concave portion 112 and two flat portions 111 respectively in the second direction, and are spaced apart in the second direction B, they apply force only to the outer portion of the circular tube's outer surface. Because circular tubes are often thin-walled fittings, with thicker walls on both sides and thinner walls in the middle, the force application position of the two protruding ridges 113 can prevent the thin-walled circular tube from deforming during connection, effectively extending the service life of the circular tube.

[0062] In this embodiment of the utility model, there are no special restrictions on the specific shape of the two protruding ridges 113, as long as they can connect the flat part 111 and the concave part 112, and contact the outer surface of the circular tube when the second tube to which the connector 10 is connected is a circular tube.

[0063] The concave portion 112 is located between the two convex portions 113 in the second direction B. When the mating surface 110 of the connector 10 is connected to a second pipe, at least part of the concave portion 112 does not completely fit with the outer surface of the circular pipe. This results in a gap 1122, as observed in the third direction C, between the concave portion 112 and the outer surface of the circular pipe.

[0064] The description “a gap 1122 is formed between the concave portion 112 and the outer surface of the circular tube, as observed in the third direction C” can refer to the fact that the diameter of a portion of the cylindrical surface of the concave portion 112 is smaller than the diameter of the outer surface of the circular tube.

[0065] In actual production, the concave portion 112 of the connector 10 is often formed by stamping, and its final shape is greatly affected by the manufacturing process. In particular, when the concave portion 112 is a partially cylindrical surface, a high degree of precision is required in matching the diameter of the concave portion 112 with the diameter of the circular tube. By setting a gap 1122, that is, by setting the diameter of the partially cylindrical surface of the concave portion 112 to be smaller than the diameter of the outer surface of the circular tube, not only are the precision requirements for the concave portion 112 of the connector 10 reduced, making the connector 10 suitable for circular tubes of different sizes, but also allowance is provided for possible deformation due to residual stamping stress in the concave portion 112. During the tube connection process, the concave portion 112 is locked to gradually fit the second tube, which is the circular tube, and forms an arch structure observable in the third direction C. This arch structure is more robust than in conventional connectors where the concave portion 112 is designed to completely fit the circular tube, i.e., the diameter of the partially cylindrical surface of the concave portion 112 is designed to be equal to the diameter of the outer surface of the circular tube. This not only makes the connection between the pipe fittings more secure, but also extends the service life of the connector 10. When the second pipe fitting connected to the mating surface 110 of the connector 10 is a circular pipe, the concave surface 112 also provides secondary positioning for the connection between the mating surface 110 and the circular pipe with its shape observed in the third direction C.

[0066] The concave portion 112 has a connecting portion 114. See also Figure 4A The connecting portion 114 is disposed in the second direction B at a position near the center of the concave portion 112 relative to the two planar portions 111. Therefore, the connecting portion 114 is also disposed in the second direction B at a position near the center of the concave portion 112 relative to the two convex portions 113.

[0067] Due to the positional relationship between the connecting part 114 and the two protruding parts 113, when the mating surface 110 of the connector 10 is connected to the second pipe, which is a circular pipe, the force vector of the connector 10 forms a relatively stable isosceles triangle. This further prevents the deformation of the connector and improves the stability of the connection.

[0068] Optionally, the connection between the connecting part 114 and the corresponding fastener 43 can be a detachable connection or a non-detachable connection.

[0069] Figure 5 This is a structural schematic diagram of another connector 10 used in an embodiment of the present utility model, including a perspective view, a right view, and a front view of the connector 10 of the second embodiment of the present utility model. The right view schematically labels a first direction A, a second direction B, and a third direction C. See also... Figure 5The connector 10 includes a plurality of connecting portions 114. More specifically, the connecting portions 114 include a first connecting portion 1141, a second connecting portion 1142, a third connecting portion 1143, and a fourth connecting portion 1144, which are non-uniformly arranged in a third direction C. In the third direction C, the second connecting portion 1142 is adjacent to the first connecting portion 1141 and the third connecting portion 1143, the third connecting portion 1143 is adjacent to the second connecting portion 1142 and the fourth connecting portion 1144, and the fourth connecting portion 1144 is adjacent to the third connecting portion 1143. In the third direction C, the maximum distance from the second connecting portion 1142 to the top end 14 of the first portion 11 in the third direction C is marked as D1. The third connecting portion 1143 is located on the side of the first connecting portion 1141 opposite to the top end 14, and its minimum distance from the top end 14 in the third direction C is marked as D2. The fourth connecting part 1144 is located on the side of the third connecting part 1143 away from the top end 14, and its minimum distance from the top end 14 in the third direction C is marked as D3.

[0070] It should be noted that "the top 14 of the first part 11 on the third direction C" can refer to the end of the first part 11 that is closer to the first connecting part 1141 on the third direction C.

[0071] Optionally, the minimum distance between the first connecting part 1141 and the top end 14 is D0, and D0≤3mm.

[0072] It should also be noted that the terms "maximum distance" and "minimum distance" can refer to the distance between the point closest to the top 14 in the outline of the connecting part 114 and the top 14 when viewed from a third-direction C, and the distance between the point farthest from the top 14 in the outline of the connecting part 114 and the top 14.

[0073] Figures 6A-6C Is using Figure 5 The diagram shows the connection between the connector and a second fitting of different sizes, which is a square tube. See also... Figure 6AFor a common square tube with a cross-sectional size of 20mm × 25mm, D1 is designed to be D1 ≤ 25mm, so that the first connecting part 1141 and the second connecting part 1142 can be used to connect with a square tube of this size. For a common square tube with a cross-sectional size of 20mm × 35mm, D2 is designed to be D2 > 30mm, so that the first connecting part 1141 and the second connecting part 1142 can be used to connect with a square tube of this size. For a common square tube with a cross-sectional size of 20mm × 40mm, D3 is designed to be D3 > 40mm, so that the first connecting part 1141, the second connecting part 1142 and the third connecting part 1143 can be used to connect with a square tube of this size. The maximum and / or minimum distances D1-D3 designed in this way can help users distinguish the installation position of the square tube and achieve the purpose of foolproofing, while including an integer number of connecting parts 114 within the cross-section of the second tube, so that the connected parts 10 are evenly stressed in the third direction C after connection, thereby improving the stability of the bed frame and increasing the service life of the connecting parts 10.

[0074] By providing multiple connecting parts 114, and especially by setting the maximum and / or minimum distance between the multiple connecting parts 114 and the top end 14, the connector 10 of the second embodiment of the present invention can connect second pipe fittings of different sizes, which are square tubes.

[0075] It should be noted that the description "non-uniformly arranged in the third direction" means that, in the third direction, the maximum and / or minimum distances from the plurality of connecting parts to the top of the first part are not necessarily a non-arithmetic sequence, rather than intended to exclude the case where the maximum and / or minimum distances from the plurality of connecting parts to the top of the first part are an arithmetic sequence. In other words, as long as it is possible to achieve that when the second pipe connected to the mating surface 110 of the connector 10 is a square pipe, the plurality of connecting parts 114 can connect square pipes of different sizes, then the technical solution of having equal distances between the connecting parts 114 is also included within the protection scope of this utility model.

[0076] For other commonly available square tubes, the dimensions between each connecting part 114 can be set similarly to achieve the connection of tubes of different sizes.

[0077] For other common sizes of round tubes on the market, when the second tube to which the connector 10 is connected is a round tube, the maximum and / or minimum distance between the connector 114 and the top end 14 can be set similarly, as long as they can achieve the same or similar technical effects.

[0078] Figure 7 Is using Figure 5The diagram illustrates the structure when multiple square tubes are connected to a second square tube using a connector. (See attached diagram.) Figure 7 Two square tubes, each with a uniform connector 10 and perpendicular to each other in the length direction, can be connected to the same second tube. That is, the multiple connecting portions 114 of the two connectors 10, which are not uniformly arranged, can all be located in one of the planes perpendicular to a third direction. The non-uniformly arranged connecting portions 114 of the two connectors 10 intersect each other and are connected to the same second tube. Preferably, the connecting portions 114 of the two connectors 10 are located in a group formed by the planes perpendicular to a third direction, and cooperate with the fastener 43 to complete the connection of the bed frame.

[0079] Preferably, the distance between the connecting portions 114 of the connector 10 is adapted to the dimensions of the cross-section of the second pipe.

[0080] Optionally, multiple first fittings connected to the second fitting can be positioned at the same level or at different levels.

[0081] A similar setup can be used when multiple first fittings that are square tubes are connected to second fittings that are round tubes.

[0082] It should be understood that the term "comprising" and its variations as used in this disclosure are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0083] The scope of protection of this disclosure is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A connector, characterized in that, The connector is used to connect a first pipe to a second pipe. The connector includes a first portion, on a first side of the first portion in a first direction, a mating surface, the mating surface including two planar portions and a concave portion; the two planar portions are spaced apart and substantially coplanar in a second direction, wherein the second direction is perpendicular to the first direction; the concave portion is located between the two planar portions in the second direction and is recessed from the two planar portions toward a second side in the first direction to form two convex ridges at the junction with the two planar portions, wherein the first side and the second side are opposite to each other in the first direction; the concave portion is provided with a connecting portion.

2. The connector according to claim 1, characterized in that, The concave surface is provided with a plurality of connecting portions, which are arranged at intervals in a third direction, and the third direction is perpendicular to both the first direction and the second direction; the plurality of connecting portions includes at least three connecting portions, which are non-uniformly arranged in the third direction.

3. The connector according to claim 2, characterized in that, At least three of the connecting parts include: First connecting part; The second connecting part is adjacent to the first connecting part, and the maximum distance from the first part to the top of the third part in the upward direction is D1; The third connecting portion, adjacent to the second connecting portion, is located on the side of the first connecting portion opposite to the top end, and the minimum distance from the top end in the third direction is D2; and The fourth connecting part is adjacent to the third connecting part, located on the side of the third connecting part away from the top end, and the minimum distance from the third connecting part to the top end is D3. Where D1≤25mm, D2>30mm, and D3>40mm.

4. The connector according to claim 1, characterized in that, The connector further includes two second parts, which are spaced apart in the second direction, connected to the first part, and protruding from the first part toward the second side in the first direction.

5. The connector according to claim 4, characterized in that, Each second part has a first segment and a second segment arranged in a third direction, the third direction being perpendicular to both the first and second directions, the first segment having a dimension of D4 in the first direction, the second segment (122) having a dimension of D5 in the first direction, and D4 > D5.

6. The connector according to claim 1, characterized in that, In a plan view taken along a third direction, the concave portion is arc-shaped, wherein the third direction is perpendicular to both the first and second directions.

7. The connector according to claim 1, characterized in that, The connecting part is a blind hole or a through hole with internal threads, or a through hole through which fasteners pass in the first part, or a connecting protrusion extending toward the first side.

8. A bed frame, characterized in that, include: The connector according to any one of claims 1 to 7; The first pipe fitting is fixedly connected to the connector. The second fitting abuts against the mating surface; as well as Fasteners are used to secure the second pipe fitting to the connector via the connecting portion.

9. The bed frame according to claim 8, characterized in that, The second pipe fitting is a square pipe, the length direction of which is perpendicular to both the first and second directions. The square pipe has a pipe wall surface facing the mating surface, and the pipe wall surface is attached to and pressed against the two planar portions.

10. The bed frame according to claim 8, characterized in that, The second fitting is a circular tube, the length direction of which is perpendicular to both the first and second directions, and the two protruding ridges are pressed against the outer surface of the circular tube.

11. The bed frame according to claim 10, characterized in that, The concave portion is a partially cylindrical surface, and the diameter of the partially cylindrical surface is smaller than the diameter of the outer surface of the circular tube.

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