CN209838877U

CN209838877U - Ceiling bolt

Info

Publication number: CN209838877U
Application number: CN201920642611.4U
Authority: CN
Inventors: 饶陈伟; 沈建智; 孙丁
Original assignee: SUZHOU SHINING HIGH STRENGTH FASTENER CO Ltd
Current assignee: SUZHOU SHINING HIGH STRENGTH FASTENER CO Ltd
Priority date: 2019-05-07
Filing date: 2019-05-07
Publication date: 2019-12-24
Anticipated expiration: 2029-05-07

Abstract

The utility model provides a ceiling bolt, including bolt head and shank of bolt, the bolt head includes bolt head top and bolt head bottom, bolt head top and bolt head bottom are connected, the central point at bolt head top puts and is equipped with the recess, the recess sets up with the bolt head top is coaxial, be equipped with the internal thread on the inside wall of recess, the tip that bolt head bottom and shank of bolt are connected is ARC structure or inclined plane structure, be equipped with first screw thread and second screw thread on the shank of bolt, first screw thread and second screw thread equipartition are established on whole shank of bolt, the centre of two adjacent teeth of first screw thread is the tooth of a second screw thread, the profile angle of first screw thread is 60, the profile angle of second screw thread is 120, the pitch of first screw thread equals the pitch of second screw thread, the external diameter of first screw thread is greater than the external diameter of second screw thread, the internal diameter of first screw thread equals the internal diameter of second screw thread, the external diameter of first screw thread equals the internal diameter.

Description

Ceiling bolt

Technical Field

The utility model relates to a fastener technical field especially relates to a furred ceiling bolt.

Background

The fastener is a mechanical part which is used for fastening and connecting and has wide application, and is widely used in the industries of energy, electronics, electrical appliances, machinery, chemical engineering, metallurgy, dies, hydraulic pressure, home furnishing and the like. The most common fasteners are bolts, nuts, etc. which perform the fastening function by a threaded or interference fit when assembled.

Referring to fig. 1, in the conventional ceiling decoration, an expansion bolt 101 is fixed on a roof, then the expansion bolt 101 is connected with a decoration screw rod 200 by a threaded sleeve 102, and then the expansion bolt is fastened by a locking nut 300, so that the conventional ceiling decoration has many parts, poor reliability and low assembly efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the shortcoming that exists among the prior art, and the ceiling bolt who provides is convenient for assemble and fixed firm.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a ceiling bolt, including bolt head and shank of bolt, the bolt head includes bolt top and bolt head bottom, bolt top and bolt head bottom are connected, the central point of bolt top puts and is equipped with the recess, the recess sets up with the bolt head top is coaxial, be equipped with the internal thread on the inside wall of recess, the tip that bolt head bottom and shank of bolt are connected is arc surface structure or inclined plane structure, be equipped with first screw thread and second screw thread on the shank of bolt, first screw thread and second screw thread equipartition are established on whole shank of bolt, the centre of two adjacent teeth of first screw thread is the tooth of a second screw thread, the tooth form angle of first screw thread is 60, the tooth form angle of second screw thread is 120, the pitch of first screw thread equals the pitch of second screw thread, the external diameter of first screw thread is greater than the external diameter of second screw thread, the internal diameter of first screw thread equals the internal diameter of second screw thread, the external diameter of first screw thread equals the internal diameter.

Preferably, the recess includes a cylindrical portion located at an end of the recess remote from the bolt shank and a conical portion located at an end of the recess close to the bolt shank, the cylindrical portion having a diameter equal to a maximum diameter of the conical portion, and the internal thread is provided on an inner side wall of the cylindrical portion. Preferably, the length of the cylindrical portion is greater than the length of the conical portion.

Preferably, the top of the bolt head comprises a central part and an outer peripheral part, the central part is of a cylindrical structure, the outer peripheral part is of a regular hexagonal prism structure which is circumscribed to the central part, and the groove is arranged at the central position of the central part.

Preferably, the end of the bolt shank is chamfered.

Preferably, the length of the bolt head is less than the length of the bolt rod.

Preferably, the top of the bolt head, the bottom of the bolt head and the shank of the bolt are integrally formed and coaxially arranged.

Preferably, the maximum diameter of the top of the bolt head is smaller than the maximum diameter of the bottom of the bolt head.

Preferably, the length of the bolt head is 8 to 10 mm longer than the length of the internal thread.

Preferably, the length of the internal thread is 1 to 1.3 times the external diameter of the internal thread.

Compared with the prior art, the beneficial effects of the utility model are that: the internal thread is arranged in the groove at the top of the bolt head, so that the assembly mode is simplified, and the assembly efficiency is improved; through set up big or small double thread structure on the shank of bolt, effectively strengthened axial tension, increased the fastening effect of bolt. The utility model has the advantages of reasonable design, the fastening is effectual, safe and reliable, and the assembly of being convenient for has improved assembly efficiency.

Drawings

FIG. 1 is an assembly schematic of a conventional ceiling bolt;

fig. 2 is a schematic structural diagram of a ceiling bolt according to an embodiment of the present invention;

FIG. 3 is a left side view of the structure of FIG. 1;

fig. 4 is an assembly view of fig. 2.

Detailed Description

In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.

Referring to fig. 2 and fig. 3, the ceiling bolt of the present invention includes a bolt head 1 and a bolt shaft 2.

The bolt head 1 comprises a bolt head top 11 and a bolt head bottom 12, the bolt head top 11 is connected with the bolt head bottom 12, a groove 13 is formed in the center of the bolt head top 11, the groove 13 and the bolt head top 11 are coaxially arranged, an internal thread 14 is formed in the inner side wall of the groove 13, and the end portion, connected with the bolt rod 2, of the bolt head bottom 12 is of a cambered surface structure or an inclined surface structure. In a preferred embodiment, the recess 13 includes a cylindrical portion 131 and a conical portion 132, the cylindrical portion 131 is located at an end of the recess 13 away from the bolt shank 2, the conical portion 132 is located at an end of the recess 13 near the bolt shank 2, the diameter of the cylindrical portion 131 is equal to the maximum diameter of the conical portion 132, and the internal thread 14 is provided on an inner side wall of the cylindrical portion 131. Further, the length of the cylindrical portion 131 is greater than the length of the conical portion 132. In another preferred embodiment, the bolt head top 11 includes a central portion 111 and an outer peripheral portion 112, the central portion 111 is a cylindrical structure, the outer peripheral portion 112 is a regular hexagonal prism-shaped structure circumscribing the central portion 111, and the groove 13 is provided at a central position of the central portion 111.

The bolt rod 2 is provided with a first thread 21 and a second thread 22, the first thread 21 and the second thread 22 are uniformly distributed on the whole bolt rod 2, the middle of two adjacent teeth of the first thread 21 is the tooth of the second thread 22, the tooth form angle alpha of the first thread 21 is 60 degrees, the tooth form angle beta of the second thread 22 is 120 degrees, the thread pitch P of the first thread 21 is equal to the thread pitch P1 of the second thread 22, the outer diameter D of the first thread 21 is larger than the outer diameter D1 of the second thread 22, the inner diameter of the first thread 21 is equal to the inner diameter of the second thread 22 and is D, and the outer diameter D of the first thread 21 is equal to the outer diameter D2 of the internal thread 14.

Preferably, the end of the bolt shank 2 is provided with a chamfer 23 to facilitate assembly.

Preferably, the length H of the bolt head 1 is smaller than the length L of the bolt shaft 2.

Preferably, the bolt head top 11, the bolt head bottom 12 and the bolt shank 2 are integrally formed and coaxially arranged.

Preferably, the maximum diameter of the head top 11 of the bolt is smaller than the maximum diameter of the bottom 12 of the bolt head.

Preferably, the length H of the bolt head 1 is 8 to 10 mm longer than the length H of the internal thread 14.

Preferably, the length h of the internal thread 14 is 1 to 1.3 times the outer diameter D of the internal thread 14.

The using method comprises the following steps: referring to fig. 4, when the ceiling bolt assembly is used, a prefabricated hole is drilled in a wall, the ceiling bolt 100 is screwed into the wall through a wind gun, the decoration screw rod 200 is directly screwed into the threaded hole of the bolt head of the ceiling bolt 100, and the ceiling bolt is fastened through the locking nut 300, so that the ceiling bolt assembly is completed, and the ceiling bolt assembly is convenient and fast. A flat spacer 400 is fixed between the ceiling bolt 100 and the wall to increase the contact area of the ceiling bolt 100 with the wall.

According to the ceiling bolt, the internal thread is arranged in the groove at the top of the bolt head, so that the assembly mode is simplified, and the assembly efficiency is improved; through set up big or small double thread structure on the shank of bolt, effectively strengthened axial tension, increased the fastening effect of bolt. The utility model has the advantages of reasonable design, the fastening is effectual, safe and reliable, and the assembly of being convenient for has improved assembly efficiency.

The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.

Claims

1. A ceiling bolt comprises a bolt head and a bolt rod, and is characterized in that the bolt head comprises a bolt head top and a bolt head bottom, the bolt head top is connected with the bolt head bottom, a groove is formed in the center of the bolt head top and coaxially arranged with the bolt head top, an internal thread is arranged on the inner side wall of the groove, the end part, connected with the bolt rod, of the bolt head bottom is of an arc surface structure or an inclined surface structure, a first thread and a second thread are arranged on the bolt rod, the first thread and the second thread are uniformly arranged on the whole bolt rod, a tooth of the second thread is arranged in the middle of two adjacent teeth of the first thread, the tooth form angle of the first thread is 60 degrees, the tooth form angle of the second thread is 120 degrees, and the thread pitch of the first thread is equal to the thread pitch of the second thread, the outer diameter of the first thread is larger than the outer diameter of the second thread, the inner diameter of the first thread is equal to the inner diameter of the second thread, and the outer diameter of the first thread is equal to the outer diameter of the internal thread.

2. A ceiling bolt according to claim 1, wherein the recess comprises a cylindrical portion at an end of the recess remote from the shank of the bolt and a conical portion at an end of the recess adjacent the shank of the bolt, the cylindrical portion having a diameter equal to the largest diameter of the conical portion, the internal thread being provided on an internal side wall of the cylindrical portion.

3. A ceiling bolt according to claim 2, wherein the length of the cylindrical portion is greater than the length of the conical portion.

4. A ceiling bolt according to claim 1, wherein the head portion includes a central portion of cylindrical configuration and an outer peripheral portion of regular hexagonal prismatic configuration circumscribing the central portion, the recess being provided at a central position of the central portion.

5. A ceiling bolt according to claim 1, wherein the end of the bolt shank is chamfered.

6. A drop ceiling bolt according to claim 1, wherein the length of the bolt head is less than the length of the bolt shaft.

7. A ceiling bolt according to claim 1, wherein the top of the bolt head, the bottom of the bolt head and the shank are integrally formed and coaxially arranged.

8. A drop ceiling bolt according to claim 1, wherein the maximum diameter of the top of the bolt head is less than the maximum diameter of the bottom of the bolt head.

9. A drop ceiling bolt according to claim 1, wherein the length of the bolt head is 8 to 10 mm longer than the length of the internal thread.

10. A ceiling bolt according to claim 1, wherein the length of the internal thread is 1 to 1.3 times the external diameter of the internal thread.