Connecting piece

Abstract

The utility model discloses a connecting piece, and relates to the technical field of hardware fittings, the connecting piece comprises a connecting rod and an expansion sleeve, the connecting rod comprises a head part, a rod part and a tail part which are connected in sequence, the expansion sleeve is sleeved on the tail part, and an expansion cavity matched with the tail part is formed in the expansion sleeve; a first circular truncated cone section, a second circular truncated cone section and a third circular truncated cone section are sequentially formed on the tail in the direction away from the head and expand step by step. The expansion sleeve comprises a connecting expansion part and an anchoring expansion part which are integrally formed, the first circular truncated cone section is sleeved with the connecting expansion part, and the first circular truncated cone section, the second circular truncated cone section and the third circular truncated cone section are sleeved with the anchoring expansion part; and a plurality of annular convex ribs are arranged on the peripheral surfaces of the connecting expansion part and the anchoring expansion part. In the utility model, the tail part of the connecting rod can effectively expand different areas of the expansion sleeve through the plurality of cone frustum sections which expand step by step, so that the expansion effect of the expansion sleeve is effectively improved, and the connection stability between furniture plates can be obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hardware accessories, in particular to a connecting piece. Background Art

[0002] At present, furniture panels are usually connected by relying on the cooperation of eccentric wheels and connecting parts, wherein the connecting parts include a connecting rod and an expansion sleeve that cooperates with the tail of the connecting rod; when assembling the furniture panels, the expansion sleeve end of the connecting part is inserted into a prefabricated hole of a furniture panel, and then the other furniture panel is aligned and inserted into the connecting part, and finally the eccentric wheel is installed in the corresponding hole position so that it clamps the head of the connecting part and locks the eccentric wheel. The eccentric wheel provides tension to the connecting rod, so that the connecting rod moves along the axial direction of the expansion sleeve, and the expansion sleeve is stretched open to achieve a tight connection between the furniture panels.

[0003] However, the existing connector only relies on a cone at the rear to expand the expansion sleeve, which has a poor expansion effect and is not conducive to the connection stability between the furniture panels. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art. The utility model provides a connecting piece, and the tail of the connecting rod can effectively open different areas of the expansion sleeve through multiple frustum sections that expand step by step, thereby effectively improving the expansion effect of the expansion sleeve and significantly improving the connection stability between furniture panels.

[0005] The utility model provides a connecting piece, which includes a connecting rod and an expansion sleeve, the connecting rod includes a head, a rod and a tail connected in sequence, the expansion sleeve is sleeved on the tail, and an expansion cavity adapted to the tail is formed inside the expansion sleeve; the tail is sequentially formed with a first frustum section, a second frustum section and a third frustum section along a direction away from the head, and the first frustum section, the second frustum section and the third frustum section expand step by step; the expansion sleeve includes an integrally formed connecting expansion part and an anchoring expansion part, the connecting expansion part is sleeved on the first frustum section, and the anchoring expansion part is sleeved on the first frustum section, the second frustum section and the third frustum section; a plurality of first annular ribs are arranged on the outer circumferential surface of the connecting expansion part, and a plurality of second annular ribs are arranged on the outer circumferential surface of the anchoring expansion part.

[0006] Specifically, the diameter of the head portion gradually decreases toward the direction approaching the rod portion.

[0007] Specifically, the second frustum segment and the third frustum segment are connected based on a transition frustum segment, and the outer circumferential surfaces of the first frustum segment, the second frustum segment, the transition frustum segment and the third frustum segment are continuously connected in sequence.

[0008] Specifically, the angle between the generatrix of the first truncated cone segment and the axis is C 1 , the angle between the generatrix of the second truncated cone segment and the axis is C 2 The angle between the generatrix of the transition cone segment and the axis is C 3 The angle between the generatrix of the third truncated cone segment and the axis is C 4 , the C 1 , said C 2 , said C 3 and the C 4 The constraint relationship is: C 4 ≥C 2 >C 3 ≥C 1 .

[0009] Specifically, a blocking ring is provided on the side where the first truncated cone section is connected to the rod portion, and a narrowing portion is provided on the side of the connecting expansion portion away from the anchoring expansion portion, and the inner diameter of the narrowing portion is smaller than the outer diameter of the blocking ring.

[0010] Specifically, a blocking platform is formed on a side where the connecting expansion portion is connected to the anchoring expansion portion and protrudes radially.

[0011] Specifically, the anchoring expansion portion includes a plurality of expansion petals disposed at intervals, and the plurality of expansion petals disposed at intervals are connected to a side away from the connecting expansion portion based on a restraining ring.

[0012] Specifically, the longitudinal section of the first annular convex rib is a first right-angled triangle structure, the hypotenuse of the first right-angled triangle structure faces upward; the longitudinal section of the second annular convex rib is a second right-angled triangle structure, the hypotenuse of the second right-angled triangle structure faces downward; and / or

[0013] The plurality of first annular convex ribs form a first thread structure; the plurality of second annular convex ribs form a second thread structure.

[0014] Specifically, a blind hole is provided in the end of the tail; and / or

[0015] The terminal edge of the tail portion is provided with a first chamfered portion or a first rounded portion.

[0016] Specifically, the outer peripheral surface of the rod portion is vertically formed with a plurality of grooves; and / or

[0017] The end edge of the rod portion close to the head portion is provided with a second chamfered portion or a second rounded portion.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] In the connecting piece of the utility model, the tail of the connecting rod is provided with a first conical section, a second conical section and a third conical section which expand step by step in sequence along the direction away from the head. When the connecting rod moves along the axial direction of the expansion sleeve, it can not only effectively expand the anchoring expansion part of the expansion sleeve, but also effectively expand the connection expansion part of the expansion sleeve, so that different areas of the expansion sleeve are fully expanded, and the expansion effect is excellent. Combined with the annular convex ribs on the outer circumferential surface of the expansion sleeve, it can effectively resist the hole walls of the two furniture panels at the same time, thereby ensuring the connection stability between the furniture panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the overall structure of the connecting piece in the embodiment of the utility model;

[0022] Figure 2 It is a structural schematic diagram of a connecting rod in an embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the connecting member in the embodiment of the utility model;

[0024] Figure 4 It is a schematic structural diagram of the expansion sleeve in the embodiment of the utility model.

[0025] In the accompanying drawings, 100, connecting rod; 110, head; 120, rod; 121, groove; 130, tail; 131, first frustum segment; 132, second frustum segment; 133, third frustum segment; 134, transition frustum segment; 135, blocking ring; 136, blind hole; 200, expansion sleeve; 210, connecting expansion part; 211, narrowing part; 220, anchoring expansion part; 221, expansion petal; 222, constraint ring; 230, blocking platform. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] The utility model provides a connecting piece. Figure 1 The overall structural schematic diagram of the connecting member in the embodiment of the utility model is shown, and the connecting member includes a connecting rod 100 and an expansion sleeve 200; Figure 2 1 shows a schematic diagram of the structure of the connecting rod in the embodiment of the utility model, wherein the connecting rod 100 comprises a head portion 110, a rod portion 120 and a tail portion 130 connected in sequence; Figure 1 and Figure 2 The expansion sleeve 200 is sleeved on the tail portion 130, and an expansion cavity adapted to the tail portion 130 is formed inside the expansion sleeve 200; please refer to Figure 2 The tail portion 130 is formed with a first truncated cone segment 131, a second truncated cone segment 132 and a third truncated cone segment 133 in sequence along a direction away from the head portion 110. The first truncated cone segment 131, the second truncated cone segment 132 and the third truncated cone segment 133 expand step by step; please refer to Figure 1 , the expansion sleeve 200 includes an integrally formed connection expansion portion 210 and an anchoring expansion portion 220; Figure 3 The cross-sectional structure diagram of the connecting member in the embodiment of the utility model is shown, the connecting expansion part 210 is sleeved on the first truncated cone section 131, and the anchoring expansion part 220 is sleeved on the first truncated cone section 131, the second truncated cone section 132 and the third truncated cone section 133; please refer to Figure 1 A plurality of first annular convex ribs are arranged on the outer circumference of the connecting expansion part 210 , and a plurality of second annular convex ribs are arranged on the outer circumference of the anchoring expansion part 220 .

[0028] In the connector of the present utility model, please refer to Figure 3 The tail portion 130 of the connecting rod 100 is provided with a first conical section 131, a second conical section 132 and a third conical section 133 which are gradually expanded in sequence along the direction away from the head portion 110. When the connecting rod 100 moves along the axial direction of the expansion sleeve 200, it can not only effectively expand the anchoring expansion portion 220 of the expansion sleeve 200, but also effectively expand the connecting expansion portion 210 of the expansion sleeve 200, so that different areas of the expansion sleeve 200 are fully expanded, and the expansion effect is excellent. Combined with the annular convex ribs on the outer circumference of the expansion sleeve 200, it can effectively resist the hole walls of the two furniture panels at the same time, thereby ensuring the connection stability between the furniture panels.

[0029] Moreover, the connecting rod 100 only needs to move a small distance to fully expand the expansion sleeve 200, that is, the pulling stroke of the connecting rod 100 is small, which is conducive to reducing the size of the eccentric wheel, thereby helping to reduce the opening on the furniture panel and making it more concealed.

[0030] In some specific embodiments, see Figure 1The diameter of the head 110 gradually decreases toward the direction approaching the rod 120, that is, the head 110 is in an inverted truncated cone shape. Such a head 110 is easier to be inserted into the eccentric wheel. Even if the installation error of the connecting piece is large, the bayonet of the eccentric wheel cannot be completely aligned with the head 110, or the head 110 cannot be completely inserted into the hole of the furniture panel, the eccentric wheel can easily hook the head 110 of the inverted truncated cone shape and smoothly insert the head 110 into the eccentric track, which has high fault tolerance and is practical and convenient. Moreover, the head 110 of the inverted truncated cone shape can cooperate with the eccentric wheel to create a larger pulling stroke in a limited space, so that the expansion effect of the expansion sleeve 200 is better.

[0031] In some specific embodiments, see Figure 2 and Figure 3 The second conical segment 132 and the third conical segment 133 are connected based on the transition conical segment 134, and the outer peripheral surfaces of the first conical segment 131, the second conical segment 132, the transition conical segment 134 and the third conical segment 133 are continuously connected in sequence, which is conducive to the smooth sliding of the expansion sleeve 200 relative to the tail portion 130. At the same time, the second conical segment 132, the transition conical segment 134 and the third conical segment 133 can provide good support for the anchoring expansion part 220 to maintain the stability of the anchoring expansion part 220 after expansion.

[0032] Specifically, the angle between the generatrix of the first truncated cone segment 131 and the axis is C 1 The included angle between the generatrix of the second truncated cone segment 132 and the axis is C 2 The angle between the generatrix of the transition truncated cone section 134 and the axis is C 3 The included angle between the generatrix of the third truncated cone segment 133 and the axis is C 4 , the C 1 , said C 2 , said C 3 and the C 4 The constraint relationship is: C 4 ≥C 2 >C 3 ≥C 1 , further ensuring that the expansion sleeve 200 can slide smoothly relative to the tail portion 130, while being conducive to the anchoring expansion portion 220 to produce the most expansion within the smallest possible pulling stroke.

[0033] Furthermore, the bottom diameter of the first truncated cone section 131 is D 1 The bottom diameter of the second truncated cone section 132 is D 2 The bottom diameter of the third truncated cone segment 133 is D 3 , the D 1 , said D 2 and the D 3The constraint relationship is: D 2 -D 1 ≥1mm, D 3 -D 2 ≥1.5mm, which is beneficial for the anchoring expansion part 220 to generate the maximum expansion within the smallest possible pulling stroke.

[0034] In some specific embodiments, see Figure 3 A blocking ring 135 is provided on the side where the first conical section 131 is connected to the rod portion 120, and a narrowing portion 211 is provided on the side of the connecting expansion portion 210 away from the anchoring expansion portion 220, and the inner diameter of the narrowing portion 211 is smaller than the outer diameter of the blocking ring 135; when the expansion sleeve 200 end of the connecting piece is inserted into the prefabricated hole of the furniture panel, the blocking ring 135 can block the narrowing portion 211, thereby preventing the expansion sleeve 200 from escaping from the tail portion 130, ensuring that the connecting rod 100 is inserted into the furniture panel together with the expansion sleeve 200.

[0035] Specifically, the expansion sleeve 200 has a movable gap in the axial direction of the tail portion 130 (the size of the movable gap refers to the axial distance between the narrowing portion 211 and the blocking ring 135), and the expansion sleeve 200 can freely move a certain distance along the axial direction of the connecting rod 100; when the expansion sleeve 200 end of the connecting piece is inserted into the prefabricated hole of the furniture panel, the expansion sleeve 200 automatically moves to abut against the blocking ring 135, away from the end of the tail portion 130. At this time, the expansion sleeve 200 will not be stretched open by the tail portion 130 and can be easily inserted into the furniture panel.

[0036] Furthermore, the range of the movable gap is 1 to 1.5 mm. If the movable gap is too large, the pulling stroke of the connecting rod 100 will increase, weakening the expansion effect of the expansion sleeve 200; if the movable gap is too small, it will increase the difficulty of inserting the expansion sleeve 200 into the furniture panel.

[0037] Figure 4 A schematic diagram of the structure of the expansion sleeve in an embodiment of the utility model is shown, and a blocking platform 230 is radially protruded on one side where the connecting expansion part 210 and the anchoring expansion part 220 are connected. The blocking platform 230 is used to locate the depth of the anchoring expansion part 220 inserted into the furniture panel, which can prompt the user to install the anchoring expansion part 220 in place, which is beneficial to improving the assembly stability of the furniture panel.

[0038] In some specific embodiments, see Figure 4The anchoring expansion part 220 includes a plurality of expansion petals 221 arranged at intervals, which can reduce the expansion resistance, increase the expansion amplitude, improve the expansion effect, and improve the fastening performance; the plurality of expansion petals 221 arranged at intervals are connected to the side away from the connecting expansion part 210 based on a constraint ring 222, which can prevent the expansion petals 221 from diverging during storage, transportation, etc., and ensure that the anchoring expansion part 220 can be easily inserted into the furniture panel.

[0039] Specifically, the plurality of expansion petals 221 disposed at intervals include two relatively small petals and two relatively large petals, which have a good expansion effect and high stability after expansion.

[0040] In some specific embodiments, the longitudinal section of the first annular rib is a first right-angled triangle structure, and the hypotenuse of the first right-angled triangle structure faces upward; the longitudinal section of the second annular rib is a second right-angled triangle structure, and the hypotenuse of the second right-angled triangle structure faces downward; the first annular rib and the second annular rib cooperate with each other and will not affect the insertion of the furniture panel, can improve the gripping force of the expansion sleeve 200, is conducive to preventing the furniture panel from falling out, and can significantly improve the connection stability between the furniture panels.

[0041] Optionally, the plurality of first annular convex ribs form a first thread structure, and the plurality of second annular convex ribs form a second thread structure, which can further improve the gripping force of the expansion sleeve 200 and significantly improve the connection stability between furniture panels.

[0042] In some specific embodiments, see Figure 3 The end of the tail portion 130 is provided with a blind hole 136 to reduce the weight of the connector. Optionally, the end edge of the tail portion 130 is provided with a first chamfer or a first rounded corner, which not only facilitates the connector to be smoothly inserted into the prefabricated hole of the furniture panel, but also helps to reduce the weight of the connector.

[0043] In some specific embodiments, see Figure 1 The outer peripheral surface of the rod 120 is vertically formed with a plurality of grooves 121, which can not only reduce the weight of the connector, but also improve the aesthetics of the connector. Optionally, the end edge of the rod 120 close to the head 110 is provided with a second chamfered portion or a second rounded portion, which not only facilitates the smooth insertion of the furniture panel into the connector, but also helps to reduce the weight of the connector.

[0044] In some specific embodiments, the connecting rod 100 is a metal connecting rod, which may be made of iron or zinc alloy, etc., with good strength, durability; the expansion sleeve 200 is a plastic expansion sleeve, which may be made of nylon, PP or PE, etc., which is easy to process and has good expansion performance.

[0045] The working process of the connector of the utility model is as follows:

[0046] Insert the anchoring expansion part 220 of the connecting piece into the prefabricated hole of a furniture panel, align another furniture panel and insert it onto the connecting expansion part 210 of the connecting piece, and finally install the eccentric wheel into the corresponding hole position so that it clamps the head 110 of the connecting piece and locks the eccentric wheel. The eccentric wheel provides a pulling force to the connecting rod 100, so that the connecting rod 100 moves axially along the expansion sleeve 200; during the axial movement of the connecting rod 100, the first frustum section 131 expands the upper end of the connecting expansion part 210, and the second frustum section 132 and the third frustum section 133 respectively expand the upper and lower ends of the anchoring expansion part 220, so that the expansion sleeve 200 firmly presses against the hole wall of the furniture panel, thereby realizing a tight connection between the furniture panels.

[0047] The connecting piece of the utility model can effectively expand different areas of the expansion sleeve 200 through multiple truncated cone sections that expand step by step, thereby effectively improving the expansion effect of the expansion sleeve 200 and significantly improving the connection stability between furniture panels; the surfaces of the multiple truncated cone sections are continuously connected in sequence, and there is a constraint relationship between the angles between the generatrix of each truncated cone section and the axis, and there is a constraint relationship between the bottom diameters of each truncated cone section, which ensures that the expansion sleeve 200 can slide smoothly relative to the tail 130, and at the same time is conducive to the anchoring expansion part 220 to produce the most expansion within the smallest possible pulling stroke, and can maintain the stability of the anchoring expansion part 220 after expansion; the expansion petal 221 of the anchoring expansion part 220 can reduce the expansion resistance, increase the expansion amplitude, improve the expansion effect, and have better fastening; the tail 130 is provided with an anti-slip blocking ring 135, and the expansion sleeve 200 has a movable gap in the axial direction of the tail 130, and the expansion of the expansion sleeve 200 The expansion flap 221 is connected based on the constraint ring 222, which can make the expansion sleeve 200 easily inserted into the furniture panel without weakening the expansion effect of the expansion sleeve 200; the outer peripheral surfaces of the connecting expansion part 210 and the anchoring expansion part 220 are both provided with annular convex ribs, which can improve the gripping force of the expansion sleeve 200 and significantly improve the connection stability between the furniture panels; the head 110 is an inverted frustum-shaped structure, even if the installation error of the connecting piece is large, the eccentric wheel can easily hook the head 110 and smoothly insert the head 110 into the eccentric track, with high fault tolerance and practical convenience; the blind hole 136, groove 121, chamfered part, rounded corner part, etc. on the connecting rod 100 can reduce the weight of the connecting piece, and the chamfered part or rounded corner part also facilitates the smooth plug-in between the furniture panel and the connecting piece; the connecting rod 100 made of metal and the expansion sleeve 200 made of plastic are strong and durable, with good expansion performance, and can effectively connect furniture panels.

[0048] A connecting piece provided in an embodiment of the present invention is introduced in detail above. Specific examples are used herein to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for a person skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A connector, characterized in that: The connecting piece includes a connecting rod and an expansion sleeve, the connecting rod includes a head, a rod and a tail connected in sequence, the expansion sleeve is mounted on the tail, and an expansion cavity adapted to the tail is formed inside the expansion sleeve; the tail is sequentially formed with a first truncated cone section, a second truncated cone section and a third truncated cone section along a direction away from the head, and the first truncated cone section, the second truncated cone section and the third truncated cone section expand step by step; the expansion sleeve includes an integrally formed connecting expansion part and an anchoring expansion part, the connecting expansion part is mounted on the first truncated cone section, and the anchoring expansion part is mounted on the first truncated cone section, the second truncated cone section and the third truncated cone section; a plurality of first annular ribs are arranged on the outer circumferential surface of the connecting expansion part, and a plurality of second annular ribs are arranged on the outer circumferential surface of the anchoring expansion part.

2. The connector according to claim 1, characterized in that The diameter of the head portion gradually decreases toward the direction approaching the stem portion.

3. The connector according to claim 1, characterized in that: The second frustum segment and the third frustum segment are connected based on a transition frustum segment, and the outer circumferences of the first frustum segment, the second frustum segment, the transition frustum segment and the third frustum segment are continuously connected in sequence.

4. The connector according to claim 3, characterized in that The angle between the generatrix of the first truncated cone segment and the axis is C1, the angle between the generatrix of the second truncated cone segment and the axis is C2, the angle between the generatrix of the transition truncated cone segment and the axis is C3, and the angle between the generatrix of the third truncated cone segment and the axis is C4. The constraint relationship among C1, C2, C3 and C4 is: C4≥C2>C3≥C1.

5. The connector according to claim 1, characterized in that: A blocking ring is provided on the side where the first truncated cone section is connected to the rod portion, and a narrowing portion is provided on the side of the connecting expansion portion away from the anchoring expansion portion, wherein the inner diameter of the narrowing portion is smaller than the outer diameter of the blocking ring.

6. The connector according to claim 1, characterized in that: A blocking platform is formed on one side of the connecting expansion portion connected to the anchoring expansion portion in a radially protruding manner.

7. The connector according to claim 1, characterized in that: The anchoring expansion portion includes a plurality of expansion petals arranged at intervals, and the plurality of expansion petals arranged at intervals are connected based on a restraining ring at a side away from the connecting expansion portion.

8. The connector according to claim 1, characterized in that The longitudinal section of the first annular rib is a first right-angled triangle structure, with the hypotenuse of the first right-angled triangle structure facing upward; the longitudinal section of the second annular rib is a second right-angled triangle structure, with the hypotenuse of the second right-angled triangle structure facing downward; and / or The plurality of first annular convex ribs form a first thread structure; the plurality of second annular convex ribs form a second thread structure.

9. The connector according to claim 1, characterized in that: A blind hole is provided in the end of the tail portion; and / or The terminal edge of the tail portion is provided with a first chamfered portion or a first rounded portion.

10. The connector according to claim 1, wherein: The outer peripheral surface of the rod portion is vertically formed with a plurality of grooves; and / or The end edge of the rod portion close to the head portion is provided with a second chamfered portion or a second rounded portion.

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