阅读说明：本技术 一种防脱紧固装置 (Anti-drop fastener ) 是由 宋智文 于 2020-06-09 设计创作，主要内容包括：本发明公开了一种防脱紧固装置,包括杆件及至少两个螺母；所述杆件的外周上设置有两组旋进方向相反的螺纹；两个所述螺母均套装在杆件上,且分别旋合在不同旋向的所述螺纹上；两个所述螺母相向一侧的侧面上均设置有至少一组相互配合并抵接的闭锁突笋。本发明采用双螺纹、双螺母防脱设计,并通过双螺母上的闭锁突笋结构实现双螺母的互锁功能,提高防脱效果。(The invention discloses an anti-drop fastening device, which comprises a rod piece and at least two nuts; two groups of threads with opposite screwing directions are arranged on the periphery of the rod piece; the two nuts are sleeved on the rod piece and are respectively screwed on the threads in different screwing directions; at least one group of locking protruding bamboo shoots which are matched with each other and abutted against each other are arranged on the side surface of one opposite side of each of the two nuts. The anti-falling device adopts a double-thread and double-nut anti-falling design, and realizes the interlocking function of the double nuts through the locking bamboo shoot structures on the double nuts, so that the anti-falling effect is improved.)

1. An anti-drop fastening device comprises a rod piece and at least two nuts; the screw rod is characterized in that two groups of threads with opposite screwing directions are arranged on the periphery of the rod piece; the two nuts are sleeved on the rod piece and are respectively screwed on the threads in different screwing directions; at least one group of locking protruding bamboo shoots which are matched with each other and abutted against each other are arranged on the side surface of one opposite side of each of the two nuts.

2. The anti-drop fastening device as claimed in claim 1, wherein each set of locking protrusions comprises a pressing portion and an extending portion; the pressing part protrudes outwards; and one side of the pressing part along the screwing direction of the nut is smoothly transited to the surface of the nut to form the extending part.

3. The anti-loosening fastening device according to claim 2, wherein at least two sets of locking protrusions are arranged on one side of the nut, and all the locking protrusions are connected end to end.

4. The anti-loosening fastening device according to claim 1, wherein the rod is a bolt or a screw.

5. The anti-loosening fastening device according to claim 4, wherein the rod member is provided with a forward thread and a reverse thread on the outer periphery thereof; the thread pitches of the forward thread and the reverse thread are equal and are arranged in an overlapping mode.

6. The anti-loosening fastening device according to claim 5, wherein the nut comprises a first nut and a second nut; a first internal thread matched with the positive thread is arranged on the first nut; and a second internal thread matched with the reverse thread is arranged on the second nut.

7. The anti-loosening fastening device according to claim 5, further comprising a spring washer fitted over the rod.

Technical Field

The invention relates to the technical field of fasteners, in particular to an anti-falling fastening device.

Background

Bolted connection is one of the most commonly used connected mode, and people often utilize the bolt to fasten the article, need avoid the bolt to loosen by oneself and take off and lead to connecting not firm problem during the use, and present ordinary bolt generally adopts the gasket or increases the nut when carrying out locking design and carries out lockingly, but ordinary two nut locking effects are not ideal, and locking effect reduces along with frequency of vibration's increase and time growth.

Disclosure of Invention

The invention provides an anti-loosening fastening device which adopts double threads and double nuts for loosening prevention, realizes the interlocking function of the double nuts through locking protruding bamboo shoot structures on the double nuts, and improves the loosening prevention effect.

In order to achieve the purpose, the invention adopts the technical scheme that:

an anti-drop fastening device comprises a rod piece and at least two nuts; two groups of threads with opposite screwing directions are arranged on the periphery of the rod piece; the two nuts are sleeved on the rod piece and are respectively screwed on the threads in different screwing directions; at least one group of locking protruding bamboo shoots which are matched with each other and abutted against each other are arranged on the side surface of one opposite side of each of the two nuts.

Furthermore, each group of locking protruding bamboo shoots comprises a pressing part and an extending part; the pressing part protrudes outwards; and one side of the pressing part along the screwing direction of the nut is smoothly transited to the surface of the nut to form the extending part.

Furthermore, at least two groups of locking protruding bamboo shoots are arranged on one side of the nut, and all the locking protruding bamboo shoots are connected end to end. .

Further, the rod is a bolt or a screw.

Further, the periphery of the rod piece is provided with a forward thread and a reverse thread; the thread pitches of the forward thread and the reverse thread are equal and are arranged in an overlapping mode.

Further, the nut comprises a first nut and a second nut; a first internal thread matched with the positive thread is arranged on the first nut; and a second internal thread matched with the reverse thread is arranged on the second nut.

Furthermore, the anti-drop fastening device also comprises a spring gasket sleeved on the rod piece.

The invention has the beneficial effects that:

1) the anti-drop device adopts a double-thread and double-nut structural design, and realizes the interlocking function of the double nuts through the locking protruding bamboo shoot structure on the double nuts, so that the anti-drop effect is improved;

2) the extension parts on the locking protruding bamboo shoots enable the locking protruding bamboo shoots between the first nut and the second nut to be tightly attached, so that the pressing parts on the locking protruding bamboo shoots are mutually abutted, the relative movement between the first nut and the second nut is prevented, and the interlocking effect is improved.

3) The screw rod is provided with the bidirectional threads, so that the length of the screw rod is effectively reduced, and materials are saved.

Drawings

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:

FIG. 1 is a perspective view of an embodiment of the present invention;

FIG. 2 is a perspective view of an unclamped state in an embodiment of the present invention;

FIG. 3 is a perspective view of the pre-tensioned state of an embodiment of the present invention;

FIG. 4 is a perspective view of a first nut of the present invention;

FIG. 5 is a perspective view of the bolt of the present invention;

FIG. 6 is an enlarged view taken at A of FIG. 5;

the attached drawings are as follows:

1-a bolt, 2-a first nut,

3-second nut, 11-positive thread,

12-reverse thread, 21-locking protruding bamboo shoot,

211, an extension part and 212, a pressing part.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or there can be intervening components, and when a component is referred to as being "disposed in the middle," it is not just disposed in the middle, so long as it is not disposed at both ends, but rather is within the scope of the middle. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items

Referring to fig. 1 to 6, an anti-drop fastening device includes a rod 1 and at least two nuts; two groups of threads with opposite screwing directions are arranged on the periphery of the rod piece 1; the two nuts are sleeved on the rod piece 1 and are screwed on the threads in different screwing directions respectively; at least one group of locking protruding bamboo shoots 21 which are matched with each other and abutted against each other are arranged on the side surfaces of the opposite sides of the two nuts.

Each group of locking protruding bamboo shoots 21 comprises a pressing part 212 and an extending part 211; the pressing part 212 protrudes outwards; one side of the pressing part 212 along the screwing direction of the nut smoothly transitions to the surface of the nut to form the extension part 211. In an embodiment, three locking protrusions 21 are provided on two nuts, and the number of the corresponding extending portions 211 and the pressing portions 212 is also three. Referring to fig. 4, all the locking protrusions 21 are connected end to end. The extending part 211 in each group of locking protruding bamboo shoots 21 is connected from the top end of the pressing part 212 of the group of locking protruding bamboo shoots 21 to the bottom end of the pressing part 212 of the next group of locking protruding bamboo shoots 21 to form an inclined plane.

The rod piece 1 is a bolt or a screw. In this embodiment, the rod member 1 is a bolt with a bolt head. The periphery of the rod piece 1 is provided with a forward thread 11 and a reverse thread 12; the thread pitches of the forward thread 11 and the reverse thread 12 are equal and are arranged in an overlapping manner. During machining, firstly, a forward thread 11 is machined at the head of the rod piece 1, then a reverse thread 12 with the same thread pitch and the reverse rotation direction as the forward thread 11 is machined on the basis of the forward thread 11, and a two-way thread which is overlapped is formed; the thread starting points of the forward thread 11 and the reverse thread 12 can be selectively arranged oppositely; two sections of threads are processed at the same position of the rod piece 1 together, so that the processing length of the threads is reduced, the length of the rod piece 1 is reduced, and materials are saved.

The nut comprises a first nut 2 and a second nut 3; a first internal thread matched with the positive thread 11 is arranged on the first nut 2; and a second internal thread matched with the reverse thread 12 is arranged on the second nut 3. The structure of the second nut 3 is similar to that of the first nut 2, and the description is omitted here.

The anti-falling fastening device also comprises a spring gasket sleeved on the rod piece 1. In particular, the spring washer is located between the fastened piece and the first nut 2. The spring washer is used for providing reverse acting force for the first nut 2 to enhance the interlocking effect between the first nut and the second nut 3, and simultaneously can compensate the movement allowance between a fastened piece and the first nut 2 so as to fix the fastened piece.

The working principle of the invention is as follows:

the first nut 2 is positioned at one end close to the head of the bolt, the left-handed direction of the first nut is close to the head of the bolt, and the right-handed direction of the first nut is far away from the head of the bolt; the second nut 3 is located at one end far away from the bolt head, the left-handed direction of the second nut is far away from the bolt head, and the right-handed direction of the second nut is close to the bolt head 11. Referring to fig. 1, the locking protrusion 21 of the first nut 2 and the locking protrusion 31 of the second nut 3 abut against each other; if the first nut 2 tends to loosen outwards, that is, the first nut 2 receives the acting force in the right-handed direction, the acting force is transmitted to the second nut 3 through the two locking protrusions 21, and the acting force in the right-handed direction enables the second nut 3 to have a tendency of advancing in the direction close to the head of the bolt, so that the effect of clamping the first nut 2 is achieved, the first nut 2 is prevented from loosening outwards, and the interlocking anti-falling effect is achieved.

The use mode of the invention is as follows:

1) when fastening, a fastened piece is placed between the first nut 2 and the bolt head, the first nut 2 is rotated to the limit position, and the second nut is pre-tightened to the state shown in fig. 3; finally, the first nut 2 is rotated rightwards, and the second nut 3 is rotated rightwards at the same time, so that the corresponding locking protrusion 21 is in an abutting state (as shown in fig. 1). The first nut 2 is loosened for a certain distance after being rotated rightwards, and a movement allowance is reserved for the first nut 2, so that the subsequent disassembly work is facilitated.

2) When the nut is loosened, because a certain movement allowance exists between the first nut 2 and the fastened piece, the first nut 2 and the second nut 3 can be simultaneously rotated leftwards, the first nut 2 moves downwards, the second nut 3 moves upwards, the locking protrusions 21 of the first nut 2 and the second nut are separated from the butt state, as shown in fig. 2, the second nut 3 is firstly disassembled, and then the first nut 2 is disassembled.

The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.