Nut anti-drop structure of electric chain saw

Abstract

The utility model relates to chain saw technical field, concretely discloses a nut anti -drop structure of electric chain saw, include: side cover, set up in the insert of side cover, casing, set up on the bolt of casing, the bolt passes through insert, the nut that can be screwed into insert, the nut can be screwed on bolt simultaneously and lock up with casing to side cover, wherein, the nut can be separated from the bolt when rotating in a direction but cannot separate from insert, when the nut continues to rotate in the opposite direction, can separate from insert. The utility model has the advantages of simple structure, easy assembly, realizing the complete separation function of nut anti -drop, and facilitating the replacement of parts.

Description

Technical Field

[0001] This utility model relates to the field of chainsaw technology, specifically to a nut-preventing structure for electric chainsaws. Background Technology

[0002] Electric chainsaws are driven by electricity to make a chain with cutting teeth rotate at high speed on a guide plate, thereby cutting materials such as wood. During use, it has been found that when working in dense forests, once the nuts on the side cover of the machine are removed to install the chain, the nuts are easy to fall into the dry grass or leaves and are easily lost. In order to avoid losing the nuts, CN101121272B discloses a sprocket cover system for a handheld chainsaw, including a sprocket cover (1); a housing (2); at least one fastening bolt (3) fixed on the housing (2) for threaded connection between the sprocket cover (1) and the housing (2); and a nut (4) for screwing onto a free thread end (5) of the fastening bolt (3), the fastening bolt being introduced through a hole (6) in the sprocket cover (1) in the assembled state. The characteristic is that the nut (4) is rotatably held in the hole (6) of the sprocket cover (1) without loss and with a gap. Once the nut is fixed to the sprocket cover, it is extremely difficult to remove. Furthermore, once the nut threads wear down during repeated tightening and loosening, the structure will cease to function. Additionally, it requires specific tools for installation, which is time-consuming and labor-intensive. Utility Model Content

[0003] The purpose of this invention is to provide a nut-preventing structure for electric chainsaws to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: a nut anti-drop structure for an electric chainsaw, comprising: Side cover; An insert set inside the side cover; chassis; Bolts are mounted on the housing and pass through inserts; A nut that can be screwed into the insert, which can simultaneously be screwed onto the bolt and lock the side cover to the housing; The nut can disengage from the bolt but not from the insert when rotated in one direction, and can disengage from the insert when rotated in the opposite direction.

[0005] Furthermore, the nut includes an end, the inner wall of which has a first internal thread, and a tube extending axially from one side of the end, the tube having a first external thread.

[0006] Furthermore, the end cannot be inserted into the insert and side cover.

[0007] Furthermore, the tube is used to screw in the insert, and the first external thread is provided on a portion of the tube away from the end.

[0008] Furthermore, the top portion of the inner wall of the insert is provided with a second internal thread, and the first external thread is screwed into the second internal thread.

[0009] Furthermore, one end of the bolt has a second external thread, which is screwed into the first internal thread.

[0010] Furthermore, the engagement direction of the first external thread and the second internal thread is opposite to the engagement direction of the second external thread and the first internal thread.

[0011] This utility model has the following beneficial effects: This utility model has a simple structure and is easy to assemble. It can prevent the nut from being lost and also enable the nut to be completely detached, making it convenient for the replacement and use of parts. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a partial cross-sectional schematic diagram of the nut anti-drop structure of the electric chainsaw in Example 1; Figure 2 for Figure 1 Enlarged schematic diagram of the central inlay; Figure 3 for Figure 1 Enlarged schematic diagram of the center nut; Figure 4 for Figure 1 Enlarged schematic diagram of the bolt.

[0014] Reference numerals: side cover 10; insert 20; second internal thread 21; housing 30; bolt 40; second external thread 41; nut 50; end 51; first internal thread 511; tube 52; first external thread 521; chain plate 60. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1 like Figures 1-4 As shown, the anti-drop nut structure of the electric chainsaw in this embodiment mainly consists of a side cover 10, an insert 20 disposed in the side cover 10, a housing 30, a bolt 40 fixedly disposed on the housing 30, a nut 50 that can be screwed into the insert 20, and a chain plate 60 disposed between the side cover 10 and the housing 30. Through the structural cooperation of the insert 20, the bolt 40 and the nut 50, the functions of anti-drop and disassembly are realized.

[0017] One end of the bolt 40 has a second external thread 41, and this end passes through the insert 20 and is screwed onto the nut 50.

[0018] Furthermore, when the nut 50 is screwed onto the insert 20, it can also be screwed onto the bolt 40, thereby locking the side cover 10 and the housing 30, and subsequently locking the chain plate 60.

[0019] Specifically, the nut 50 includes an end 51 that cannot be inserted into the insert 20 and the side cover 10. The inner wall of the end 51 has a first internal thread 511. A tube 52 is provided on one side of the end 51 extending axially. The tube 52 is used to insert into the insert 20 and is located in the gap between the insert 20 and the bolt 40.

[0020] Meanwhile, the tube 52 is provided with a first external thread 521. The first external thread 521 is located at a local position on the outer wall of the tube 52 on the side away from the end 51, that is, most of the outer wall is smooth.

[0021] Furthermore, the insert 20 can be integrally injection molded with the side cover 10 or press-fitted. The top part of the inner wall of the insert 20 is provided with a second internal thread 21, that is, most of the inner wall of the insert 20 is smooth.

[0022] Here, the first external thread 521 is screwed into the second internal thread 21, and the second external thread 41 is screwed into the first internal thread 511. Moreover, the screwing direction of the first external thread 521 and the second internal thread 21, that is, the screwing direction of the nut 50 and the insert 20, is opposite to the screwing direction of the second external thread 41 and the first internal thread 511, that is, the screwing direction of the bolt 40 and the nut 50.

[0023] If the nut 50 and the insert 20 have a reverse thread fit, then the bolt 40 and the nut 50 have a positive thread fit.

[0024] Therefore, when the nut 50 rotates in a certain direction, it can disengage from the bolt 40 but cannot disengage from the insert 20. At this time, the side cover 10 can be removed. The nut 50 is still connected to the side cover and will not be lost. When it is necessary to disassemble the nut 50... When the nut 50 is lifted and rotated in the opposite direction, it can be disengaged from the insert 20, thus removing the nut 50.

[0025] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A nut anti-drop structure for an electric chainsaw, characterized in that, include: Side cover; An insert set inside the side cover; chassis; Bolts are mounted on the housing and pass through inserts; A nut that can be screwed into the insert, which can simultaneously be screwed onto the bolt and lock the side cover to the housing; The nut can disengage from the bolt but not from the insert when rotated in one direction, and can disengage from the insert when rotated in the opposite direction.

2. The nut anti-drop structure for an electric chainsaw according to claim 1, characterized in that: The nut includes an end, the inner wall of which has a first internal thread, and a tube extending axially from one side of the end, the tube having a first external thread.

3. The nut anti-drop structure for an electric chainsaw according to claim 2, characterized in that: The end cannot be inserted into the insert or side cover.

4. The nut anti-drop structure for an electric chainsaw according to claim 2, characterized in that: The tube is used to screw in the insert, and the first external thread is provided on a portion of the tube away from the end.

5. The nut anti-drop structure for an electric chainsaw according to claim 4, characterized in that: The top portion of the inner wall of the insert is provided with a second internal thread, and the first external thread is screwed into the second internal thread.

6. The nut anti-drop structure for an electric chainsaw according to claim 5, characterized in that: One end of the bolt has a second external thread, which is screwed into the first internal thread.

7. The nut anti-drop structure for an electric chainsaw according to claim 6, characterized in that: The direction of engagement between the first external thread and the second internal thread is opposite to the direction of engagement between the second external thread and the first internal thread.

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