CN112610580B - Expansion bolt - Google Patents

Expansion bolt Download PDF

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Publication number
CN112610580B
CN112610580B CN202011529580.5A CN202011529580A CN112610580B CN 112610580 B CN112610580 B CN 112610580B CN 202011529580 A CN202011529580 A CN 202011529580A CN 112610580 B CN112610580 B CN 112610580B
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CN
China
Prior art keywords
sliding block
groove
bolt
expansion
adjusting
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CN202011529580.5A
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Chinese (zh)
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CN112610580A (en
Inventor
郑志强
陈建
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Quanzhou Shuangyi Machinery Co ltd
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Quanzhou Shuangyi Machinery Co ltd
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Priority to CN202011529580.5A priority Critical patent/CN112610580B/en
Publication of CN112610580A publication Critical patent/CN112610580A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/04Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
    • F16B13/08Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front with separate or non-separate gripping parts moved into their final position in relation to the body of the device without further manual operation
    • F16B13/0808Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front with separate or non-separate gripping parts moved into their final position in relation to the body of the device without further manual operation by a toggle-mechanism

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

The invention relates to the field of bolts, in particular to an expansion bolt which comprises a bolt main body assembly, an outer adjusting assembly and an inner adjusting assembly, wherein the outer adjusting assembly and the inner adjusting assembly are arranged in the bolt main body assembly, an outer adjusting sleeve and an inner adjusting sleeve in the outer adjusting assembly and the inner adjusting assembly can drive a first sliding block and a second sliding block to slide in an adjusting groove, when the first sliding block and the second sliding block can slide, the distance between the first sliding block and the second sliding block can be adjusted through the outer adjusting sleeve and the inner adjusting sleeve, after the distance between the first sliding block and the second sliding block is changed, an included angle between a first expansion rod and a second expansion rod is changed, the first expansion rod and the second expansion rod extend outwards, the traditional support mode of the expansion bolt is replaced, the contact area between an outer shell and a floor can be effectively increased, and the connection of the expansion bolt can be more stable.

Description

Expansion bolt
Technical Field
The invention relates to the field of bolts, in particular to an expansion bolt.
Background
An expansion bolt is a special screw connector for fixing pipeline branch/hanger/bracket or equipment on wall, floor and column.
The expansion bolts used for the floor slab are mostly characterized in that the outer shell is inserted into the floor slab and then is propped open through the inserted inner bolts, so that the outer shell is inserted into the floor slab, the thickness of the floor slab is different, the hardness of the floor slab is different, when the thickness of the floor slab is thin, contact points between the propped-open area of the outer shell and the floor slab are few, the floor slab can not be effectively and stably fixed on the outer shell, and the expansion bolts can not effectively hang objects.
Disclosure of Invention
The invention provides an expansion bolt aiming at the problems in the prior art.
The technical scheme adopted by the invention for solving the technical problem is as follows: the utility model provides an expansion bolt, includes bolt main part subassembly, outer adjusting part and interior adjusting part, outer adjusting part all sets up the inside at bolt main part subassembly, just interior adjusting part sets up the inside at outer adjusting part, bolt main part subassembly includes shell body, interior bolt, toper grafting end, recess, nut and adjustment tank and constitutes, set up the internal thread on the lateral wall of circle side in the shell body, the inside of shell body is provided with interior bolt, the top of shell body is provided with toper grafting end, the bottom of toper grafting end corresponds interior bolt and sets up flutedly, the inside of recess corresponds the external screw thread on the interior bolt outer wall and has seted up the internal thread, just interior bolt screw thread is pegged graft in the inside of recess, the shell body is extended to the one end that toper grafting end was kept away from to interior bolt, just the screw thread has cup jointed the nut on the outer wall that interior bolt extends shell body one end, equidistant the seting up of a plurality of adjustment tank on the outer wall of shell body.
Specifically, the outer adjusting assembly comprises an outer adjusting sleeve, a first sliding block, a first limiting sliding block, a first annular limiting sliding groove, a hinged projection, a first pin shaft, a first expansion rod, a second pin shaft and a second expansion rod, wherein internal threads and external threads are respectively formed in the inner cylinder wall and the outer cylinder wall of the outer adjusting sleeve, the outer adjusting sleeve is inserted in the outer shell in a threaded manner, the outer adjusting sleeve is in threaded connection with the outer shell, one end of the inner portion of the adjusting groove is slidably connected with the first sliding block, the first limiting sliding block is fixedly connected to the side wall of one side, close to the outer adjusting sleeve, of the first sliding block, the first annular limiting sliding groove is formed in the outer cylinder wall of the outer adjusting sleeve and corresponds to the first limiting sliding block, the first annular limiting sliding groove is matched with the first limiting sliding block, the hinged projection is fixedly connected to the top of the first sliding block, the first expansion rod is arranged on two sides of the top of the hinged projection, the first expansion rod is hinged to the hinged projection through the first pin shaft, one ends of the two first expansion rods, which are far away from the hinged projection, the second expansion rod is hinged to the second expansion rod, and the second expansion rod is longer than the second expansion rod, and the second expansion rod is arranged between the two expansion rods.
Specifically, the inner adjusting assembly comprises an inner adjusting sleeve, a second sliding block, a second limiting sliding block, a second annular limiting sliding groove, a hinged concave block, a hinged groove and a third pin shaft, wherein an inner wall and an outer wall of the inner adjusting sleeve are respectively provided with an internal thread and an external thread, the inner adjusting sleeve is in threaded connection with the inside of the outer adjusting sleeve, the inner adjusting sleeve is in threaded connection with the outer wall of the inner bolt in a sleeved mode, the inner top of the adjusting groove is in sliding connection with the second sliding block, the second sliding block is fixedly connected to the side wall, close to one side of the inner adjusting sleeve, of the side wall, the outer wall of the inner adjusting sleeve corresponds to the second limiting sliding block, the second annular limiting sliding block is arranged in the outer wall of the inner adjusting sleeve, the hinged concave block is fixedly connected to the bottom of the second expanding rod, one end, far away from the second pin shaft, of the second expanding rod extends to the inside of the hinged groove, and the end, extending to the inside of the hinged groove is hinged to the hinged concave block through the third pin shaft.
Specifically, the one end equidistant fixedly connected with a plurality of bracer that the toper end of pegging graft is close to the shell body, the spread groove has been seted up to corresponding the bracer on the inner wall of shell body, spread groove and bracer phase-match set up.
Specifically, a gasket is arranged between the screw cap and the outer shell, and the gasket is sleeved at one end, extending out of the outer shell, of the inner bolt.
Specifically, the diameter of the conical insertion end is larger than the inner diameter of the outer shell.
The invention has the beneficial effects that:
(1) According to the expansion bolt, the outer adjusting assembly and the inner adjusting assembly are arranged in the bolt main body assembly, the outer adjusting sleeve and the inner adjusting sleeve in the outer adjusting assembly and the inner adjusting assembly can drive the first sliding block and the second sliding block to slide in the adjusting groove, when the first sliding block and the second sliding block can slide, the distance between the first sliding block and the second sliding block can be adjusted through the outer adjusting sleeve and the inner adjusting sleeve, after the distance between the first sliding block and the second sliding block is changed, the included angle between the first expansion rod and the second expansion rod is changed, the first expansion rod and the second expansion rod extend outwards, the traditional supporting mode of the expansion bolt is replaced, the contact area between the outer shell and a floor slab can be effectively increased, the connection of the expansion bolt can be more stable, and the first sliding block and the second sliding block can slide in the adjusting groove, so that the inserting depth of the expansion bolt can be adjusted more as required.
(2) According to the expansion bolt, the traditional plastic outer shell is replaced by the metal outer shell in the bolt main body assembly, so that the overall strength of the expansion bolt can be effectively improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural view of an expansion bolt according to the present invention in use;
FIG. 2 is a schematic structural view of an expansion bolt according to the present invention;
FIG. 3 is an enlarged view of a portion A of FIG. 2 of an expansion bolt according to the present invention;
FIG. 4 is a schematic structural view of a tapered insertion end of an expansion bolt according to the present invention;
fig. 5 is a schematic view of an internal structure of an outer shell in an expansion bolt according to the present invention;
fig. 6 is a schematic view of a connection structure of a first expansion rod and a second expansion rod in the expansion bolt provided by the invention;
fig. 7 is a schematic structural view of an outer adjusting sleeve and an inner adjusting sleeve in an expansion bolt provided by the present invention.
In the figure: 1. a bolt body assembly; 11. an outer housing; 12. an inner bolt; 13. a tapered plug end; 14. a groove; 15. a supporting block; 16. connecting grooves; 17. a gasket; 18. a nut; 19. an adjustment groove; 2. an outer adjustment assembly; 21. an outer adjustment sleeve; 22. a first slider; 23. a first limit slide block; 24. a first annular limiting chute; 25. a hinge projection; 26. a first pin shaft; 27. a first expansion link; 28. a second pin shaft; 29. a second expansion link; 3. an inner adjustment assembly; 31. an inner adjustment sleeve; 32. a second slider; 33. a second limit slide block; 34. a second annular limiting chute; 35. hinging the concave block; 36. a hinge slot; 37. and a third pin shaft.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 7, the expansion bolt of the present invention includes a bolt main body assembly 1, an outer adjustment assembly 2, and an inner adjustment assembly 3, wherein the outer adjustment assembly 2 is disposed inside the bolt main body assembly 1, and the inner adjustment assembly 3 is disposed inside the outer adjustment assembly 2, the bolt main body assembly 1 includes an outer shell 11, an inner bolt 12, a tapered insertion end 13, a groove 14, a nut 18, and an adjustment groove 19, an inner thread is disposed on a side wall of an inner circular side of the outer shell 11, the inner bolt 12 is disposed inside the outer shell 11, a tapered insertion end 13 is disposed on a top of the outer shell 11, a groove 14 is disposed at a bottom of the tapered insertion end 13 corresponding to the inner bolt 12, an inner thread is disposed inside the groove 14 corresponding to an outer thread on an outer wall of the inner bolt 12, the thread of the inner bolt 12 is inserted into the groove 14, an end of the inner bolt 12 far from the tapered insertion end 13 extends out of the outer shell 11, the inner bolt 12 extends out of the outer wall of the outer shell 11, the outer wall of the outer shell 11 is sleeved with the thread 18, a plurality of the adjustment grooves 19 are disposed on the outer wall, and the insertion end of the outer wall of the outer shell 11 can be used conveniently.
Specifically, the external adjustment assembly 2 includes an external adjustment sleeve 21, a first sliding block 22, a first limit slider 23, a first annular limit sliding groove 24, a hinge projection 25, a first pin shaft 26, a first expansion rod 27, a second pin shaft 28 and a second expansion rod 29, an inner cylinder wall and an outer cylinder wall of the external adjustment sleeve 21 are respectively provided with an internal thread and an external thread, the external adjustment sleeve 21 is inserted in the external shell 11 in a threaded manner, the external adjustment sleeve 21 is connected with the external shell 11 in a threaded manner, one end of the inside of the adjustment groove 19 is slidably connected with the first sliding block 22, the first sliding block 22 is fixedly connected with the first limit sliding block 23 on the side wall close to one side of the external adjustment sleeve 21, the first annular limit sliding groove 24 is provided on the outer cylinder wall of the external adjustment sleeve 21 corresponding to the first limit sliding block 23, the first annular limit sliding groove 24 is matched with the first limit sliding block 23, the top of the first sliding block 22 is fixedly connected with the hinge projection 25, two sides of the top of the hinge projection 25 are provided with the first limit sliding block 27, the first limit sliding block 27 is hinged to the second limit sliding block 22, the expansion rod 29 is hinged to the first limit sliding block 27, the first limit sliding block 27 is hinged to drive the second expansion rod 22, the first limit sliding block 27, and the second limit sliding block 27 is hinged to rotate in the external adjustment sleeve 21, and the expansion rod when the external adjustment sleeve 21, the expansion rod 29, the expansion rod 27 is hinged expansion rod, the two expansion rod 27 is hinged expansion rod 27, the external adjustment sleeve 21.
Specifically, the inner adjusting assembly 3 includes an inner adjusting sleeve 31, a second sliding block 32, a second limiting sliding block 33, a second annular limiting sliding groove 34, a hinged concave block 35, a hinged groove 36 and a third pin shaft 37, an inner wall and an outer wall of the inner adjusting sleeve 31 are respectively provided with an internal thread and an external thread, the inner adjusting sleeve 31 is inserted in the outer adjusting sleeve 21 in a threaded manner, the inner adjusting sleeve 31 is sleeved on the outer wall of the inner bolt 12 in a threaded manner, the inner top of the adjusting groove 19 is slidably connected with the second sliding block 32, the second sliding block 32 is fixedly connected to the side wall close to one side of the inner adjusting sleeve 31, the second limiting sliding block 33 is fixedly connected to the outer wall of the inner adjusting sleeve 31, the second annular limiting sliding groove 34 is provided on the outer wall of the inner adjusting sleeve 31 corresponding to the second limiting sliding block 33, the hinged concave block 35 is fixedly connected to the bottom of the second sliding block 32, the hinged concave block 35 is provided to the bottom of the hinged concave block 35, one end, far away from the second pin shaft 28, extends to the inside of the hinged groove 36, and the inner adjusting sleeve 31 of the second sliding block 31 rotates along with the inner adjusting sleeve 34, and the inner adjusting sleeve 31.
Specifically, the equidistant fixedly connected with a plurality of bracer 15 of one end that toper end of pegging graft 13 is close to shell body 11, connecting groove 16 has been seted up to corresponding bracer 15 on the inner wall of shell body 11, connecting groove 16 sets up with bracer 15 phase-match, and interior bolt 12 can drive threaded connection's toper end of pegging graft 13 and remove towards the inside of shell body 11 when the out-draw, can drive bracer 15 along connecting groove 16 and strut shell body 11 when toper end of pegging graft 13 when the out-draw for shell body 11 can not break away from by the inside of wall body.
Specifically, be provided with packing ring 17 between nut 18 and the shell body 11, packing ring 17 cup joints the one end that interior bolt 12 extends shell body 11, and packing ring 17 can increase the area of contact between installed part and nut 18 and the shell body 11, can effectually make to be connected more stable between nut 18 and the shell body 11.
Specifically, the diameter of the conical insertion end 13 is greater than the inner diameter of the outer shell 11, so that the conical insertion end 13 can be effectively prevented from sliding into the outer shell 11, and the conical insertion end 13 can effectively support the inner bolt 12.
In use, as shown in fig. 2 in an initial state, the first expansion rod 27 and the second expansion rod 29 are both located inside the adjustment slot 19 and at a central position, the conical insertion end 13 is firstly contacted with the floor slab, since the top end of the conical insertion end 13 is sharp, the conical insertion end 13 can conveniently drive the outer shell 11 to be inserted into the floor slab and pass through the floor slab, the conical insertion end 13 passes through the floor slab, then the inner wall of one end of the outer adjustment sleeve 21 and the inner adjustment sleeve 31 away from the conical insertion end 13 is provided with the inner groove 14 to be shifted, the outer adjustment sleeve 21 moves towards one end close to the conical insertion end 13, and the outer adjustment sleeve 21 can drive the inner adjustment sleeve 31 to move together, when the second sliding block 32 is contacted with the inner top wall of the adjustment slot 19, because the jacking of first sliding block 22 can make the contained angle between articulated first expansion pole 27 and second expansion pole 29 narrow, and first expansion pole 27 and second expansion pole 29 will extend outwards along second round pin axle 28, when first expansion pole 27 is like the state shown in fig. 1, and behind first expansion pole 27 level, stop the rotation of outer adjusting sleeve 21, finally, rotate interior adjusting sleeve 31, interior adjusting sleeve 31 can drive second sliding block 32 vertical downward movement when rotating, second sliding block 32 drives articulated second expansion pole 29 and supports first expansion pole 27 and makes first expansion pole 27 and the top in close contact with the floor, make first expansion pole 27 and second expansion pole 29 be connected the shell body 11 precision with the floor.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are intended to be within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (4)

1. An expansion bolt is characterized by comprising a bolt main body assembly (1), an outer adjusting assembly (2) and an inner adjusting assembly (3), wherein the outer adjusting assembly (2) is arranged inside the bolt main body assembly (1), and the inner adjusting assembly (3) is arranged inside the outer adjusting assembly (2); the bolt main body assembly (1) comprises an outer shell (11), an inner bolt (12), a conical insertion end (13), a groove (14), a nut (18) and adjusting grooves (19), wherein an internal thread is formed in the side wall of the inner circle side of the outer shell (11), the inner bolt (12) is arranged inside the outer shell (11), the conical insertion end (13) is arranged at the top of the outer shell (11), the groove (14) is formed in the bottom of the conical insertion end (13) corresponding to the inner bolt (12), an internal thread is formed in the groove (14) corresponding to an external thread on the outer wall of the inner bolt (12), the inner bolt (12) is inserted into the groove (14) in a threaded manner, one end, far away from the conical insertion end (13), of the inner bolt (12) extends out of the outer shell (11), the nut (18) is sleeved on the external thread on the outer wall of one end, extending out of the outer shell (11), and the plurality of the adjusting grooves (19) are formed in an equidistant manner in the outer wall of the outer shell (11);
the outer adjusting assembly (2) comprises an outer adjusting sleeve (21), a first sliding block (22), a first limiting sliding block (23), a first annular limiting sliding groove (24), a hinge lug (25), a first pin shaft (26), a first expansion rod (27), a second pin shaft (28) and a second expansion rod (29), wherein an inner cylinder wall and an outer cylinder wall of the outer adjusting sleeve (21) are respectively provided with an internal thread and an external thread, the outer adjusting sleeve (21) is in threaded connection with the outer shell (11), one end inside the adjusting groove (19) is slidably connected with the first sliding block (22), the side wall of the first sliding block (22) close to one side of the outer adjusting sleeve (21) is fixedly connected with the first limiting sliding block (23), the outer cylinder wall of the outer adjusting sleeve (21) is provided with the first annular limiting sliding groove (24) corresponding to the first limiting sliding block (23), the first annular limiting sliding groove (24) is matched with the first limiting sliding block (23), the first limiting sliding block (25) is fixedly connected with the hinge lug (25), the hinge lug (25) at the top of the first limiting sliding block (27) is connected with the hinge lug (25), one ends, far away from the hinge lug (25), of the two first expansion rods (27) are hinged to second expansion rods (29) through second pin shafts (28), the second expansion rods (29) are arranged between the two first expansion rods (27), and the length of each second expansion rod (29) is larger than that of each first expansion rod (27);
the inner adjusting component (3) comprises an inner adjusting sleeve (31), a second sliding block (32), a second limiting sliding block (33), a second annular limiting sliding groove (34), a hinge concave block (35), a hinge groove (36) and a third pin shaft (37), the inner cylinder wall and the outer cylinder wall of the inner adjusting sleeve (31) are respectively provided with an internal thread and an external thread, the inner adjusting sleeve (31) is inserted in the outer adjusting sleeve (21) in a threaded manner, and the inner adjusting sleeve (31) is sleeved on the outer wall of the inner bolt (12) in a threaded manner, the inner top of the adjusting groove (19) is connected with a second sliding block (32) in a sliding way, a second limiting slide block (33) is fixedly connected on the side wall of one side of the second slide block (32) close to the inner adjusting sleeve (31), a second annular limiting sliding groove (34) is arranged on the outer cylinder wall of the inner adjusting sleeve (31) corresponding to the second limiting sliding block (33), the bottom of the second sliding block (32) is fixedly connected with a hinged concave block (35), the bottom of the hinge concave block (35) is provided with a hinge groove (36), one end of the second expansion rod (29) far away from the second pin shaft (28) extends to the inside of the hinge groove (36), and one end of the second expansion rod (29) extending to the inside of the hinge groove (36) is hinged with the hinge concave block (35) through a third pin shaft (37).
2. An expansion bolt according to claim 1, characterized in that: the utility model discloses a taper splicing device, including shell body (11), toper grafting end (13) are close to the equidistant fixedly connected with a plurality of bracer (15) of one end of shell body (11), spread groove (16) have been seted up corresponding bracer (15) on the inner wall of shell body (11), spread groove (16) and bracer (15) phase-match set up.
3. An expansion bolt according to claim 1, wherein: a gasket (17) is arranged between the nut (18) and the outer shell (11), and the gasket (17) is sleeved at one end, extending out of the outer shell (11), of the inner bolt (12).
4. An expansion bolt according to claim 1, wherein: the diameter of the conical insertion end (13) is larger than the inner diameter of the outer shell (11).
CN202011529580.5A 2020-12-22 2020-12-22 Expansion bolt Active CN112610580B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011529580.5A CN112610580B (en) 2020-12-22 2020-12-22 Expansion bolt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011529580.5A CN112610580B (en) 2020-12-22 2020-12-22 Expansion bolt

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CN112610580A CN112610580A (en) 2021-04-06
CN112610580B true CN112610580B (en) 2022-12-13

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113062907B (en) * 2021-04-12 2023-01-03 浙江联通家具配件有限公司 Expansion fastening bolt for cork material and mounting method thereof
CN113217515A (en) * 2021-05-20 2021-08-06 香港理工大学 Blind plate bolt

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CN208605467U (en) * 2018-07-21 2019-03-15 天津市信泰科技发展有限公司 A kind of helix nailing that band is auxiliarily fixed
CN211525285U (en) * 2020-01-13 2020-09-18 深圳市建辉五金制品有限公司 Novel unsmooth self-adaptation expansion bolts

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Publication number Priority date Publication date Assignee Title
FR2008342A7 (en) * 1968-05-13 1970-01-23 Pretat Raymond
EP0287981A2 (en) * 1987-04-22 1988-10-26 Julius Blum Gesellschaft m.b.H. Connector for connecting two structural elements
US5205693A (en) * 1992-05-11 1993-04-27 Fuller S Wyatt Quick release bolt
DE102011111064A1 (en) * 2010-08-27 2012-04-05 Markus Fröwis Arrangement for, in particular distanced, fixing at least one Dammstoffplatte to a building
CN202768570U (en) * 2011-08-02 2013-03-06 裴春光 Shearing type expansion bolt
CN107355458A (en) * 2017-07-06 2017-11-17 海盐县通顺标准件厂 A kind of modified form setscrew
CN107605913A (en) * 2017-10-30 2018-01-19 安徽凯瑞汽配制造有限公司 A kind of adjustable type anti-drop bolt
CN208605467U (en) * 2018-07-21 2019-03-15 天津市信泰科技发展有限公司 A kind of helix nailing that band is auxiliarily fixed
CN211525285U (en) * 2020-01-13 2020-09-18 深圳市建辉五金制品有限公司 Novel unsmooth self-adaptation expansion bolts

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