Bolt with length convenient to adjust

Abstract

The utility model relates to the technical field of machining and manufacturing, and discloses a bolt convenient to adjust length, which comprises a fixed cylinder, an external thread base is fixedly mounted at the bottom of the fixed cylinder, and a fixed external thread sleeve is fixedly mounted on the outer side of the fixed cylinder. A proper number of movable external thread bushings are selected for insertion, the head and the top end of the telescopic rod are fixed through the fixing mechanism, the telescopic rod retracts into the fixing cylinder through the spring, the movable external thread bushings are tightly attached to the fixed external thread bushings, the limiting ring is matched with the fixing strip, and all pairs of positioning columns and positioning holes are matched. Therefore, when the head part is rotated, the fixed external thread sleeve and the added movable external thread sleeves synchronously rotate and are matched for use, so that the length of the bolt can be adjusted to a certain extent, the bolt is used according to actual requirements to adapt to the requirements of different through hole depths, the adaptability of the bolt is enhanced, the universality is improved, and the bolt is convenient to use; and the fixed operation efficiency of workers is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing and manufacturing, in particular to a bolt which is convenient for adjusting the length. Background Art

[0002] A bolt is a special mechanical part, mainly composed of a threaded rod and a head. As a commonly used fastener, it is specifically used to connect two parts with matching threaded holes. The bolt connection method makes it easy to disassemble the two connected parts, so it is widely used in various industries.

[0003] However, the length of the threaded rod of the existing bolts is mostly fixed and cannot be adjusted according to the actual situation. When encountering a deeper through hole, it is necessary to replace the bolt with a threaded rod of the corresponding length for connection. Due to poor adaptability and low versatility, the efficiency of workers' fixing operations is affected. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] The purpose of the utility model is to provide a bolt with an adjustable length to solve the problem raised in the above-mentioned background technology that the length of the threaded rod of the existing bolts is mostly fixed and cannot be adjusted according to the specific actual situation. When encountering a deeper through hole, it is necessary to replace the bolt with a threaded rod of the corresponding length for connection. Due to the poor adaptability and low versatility, the efficiency of the workers' fixing operation is affected.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a bolt that is easy to adjust the length, comprising a fixing tube, an externally threaded base is fixedly installed on the bottom of the fixing tube, a fixed externally threaded sleeve is fixedly installed on the outside of the fixing tube, a telescopic rod is inserted into the inner side of the upper end of the fixing tube, three movable externally threaded sleeves are sleeved on the outer side of the telescopic rod, a head is provided on the upper side of the telescopic rod, and a docking hole is provided at the bottom of the head, the top of the telescopic rod is inserted into the docking hole, an inner groove is provided on the inner side of the head and is connected to both sides of the docking hole, a fixing mechanism for fixing the telescopic rod is provided in the inner groove, and a tamping hole connected to the inside is provided at the bottom of the fixing tube and the externally threaded base.

[0008] Preferably, a limiting ring is fixedly installed on the bottom of the telescopic rod, a limiting sleeve is fixedly installed on the upper end of the fixed tube, fixing bars are fixedly installed on both ends of the inner side of the fixed tube, and sliding grooves corresponding to the fixing bars sliding through are opened on both sides of the limiting ring.

[0009] Through the above technical solution, the limiting sleeve and the limiting ring cooperate to limit the telescopic rod in the fixed tube to prevent it from being pulled out, and the fixing strip cooperates with the sliding groove so that when the telescopic rod is rotated, the fixed tube also rotates synchronously.

[0010] Preferably, a concave hole is opened on the inner side of the bottom of the telescopic rod, a spring is fixedly installed in the concave hole, and the lower end of the spring passes through the concave hole and is fixedly installed on the bottom wall of the fixed cylinder.

[0011] Through the above technical solution, the spring is always in a stretched state, giving a force to a telescopic rod to retract into the fixed tube, so that each movable external threaded sleeve is pressed against the fixed external threaded sleeve for coordinated use.

[0012] Preferably, the threads at the connection between the fixed tube and the externally threaded base are arranged continuously, and the external threads between the three movable externally threaded sleeves and with the external threads of the fixed externally threaded sleeve are arranged continuously.

[0013] Through the above technical solution, the fixed tube, the external thread base and each movable external thread sleeve are threaded continuously and can be used in combination, wherein the number of movable external thread sleeves can be selected to adjust the overall length.

[0014] Preferably, the bottom of each movable external threaded sleeve and the bottom of the head are both symmetrically fixed with four positioning columns on the central axis, and the upper end of each movable external threaded sleeve and the upper end of the fixed external threaded sleeve are both symmetrically opened with four corresponding positioning holes on the central axis.

[0015] Through the above technical solution, the positioning column and the positioning hole cooperate to quickly connect the movable external thread sleeves, the head and the fixed external thread sleeve to complete the continuous connection of the external thread.

[0016] Preferably, the fixing mechanism includes a threaded rod and a bevel gear, the threaded rod is rotatably installed on the upper side of the inner groove, threads with opposite rotation directions are symmetrically arranged on the outer sides of both ends of the threaded rod, and a bevel gear is fixedly installed on the outer side of the middle part of the threaded rod.

[0017] Through the above technical solution, the rotation of the bevel gear 1 can drive the threaded rod to rotate.

[0018] Preferably, the fixing mechanism also includes bevel gear 2, a connecting column and a rotating head, the upper end of bevel gear 1 is meshingly connected with bevel gear 2, the upper end of bevel gear 2 is fixedly installed with a connecting column, the upper end of the connecting column passes through the inner groove and is fixedly installed with a rotating head.

[0019] Through the above technical solution, rotating the rotating head drives the connecting column to rotate, the connecting column drives the second bevel gear to rotate, and the second bevel gear drives the first bevel gear to rotate, and the threaded rod rotates accordingly.

[0020] Preferably, the fixing mechanism also includes a movable plate, a plug column and a socket, the outer sides of both ends of the threaded rod are symmetrically threaded with movable plates, the relatively close ends of the two movable plates are fixedly installed with a plug column, and the upper end of the telescopic rod is correspondingly provided with a through socket.

[0021] Through the above technical solution, when the threaded rod rotates, it drives the two movable plates to move relatively close to each other, and the movable plates push the two plug posts to be inserted into the plug holes at the upper ends of the telescopic rods to complete the docking and fixation.

[0022] Compared with the prior art, the utility model provides a bolt that is easy to adjust in length and has the following beneficial effects:

[0023] The utility model provides a fixed cylinder, an externally threaded base, a fixed externally threaded sleeve, a telescopic rod, a movable externally threaded sleeve, a head, a fixing mechanism, etc. The external movable externally threaded sleeve can be inserted in an appropriate number according to needs, and the head is fixed to the top of the telescopic rod by using the fixing mechanism. Under the action of a spring, etc., the telescopic rod is retracted into the fixed cylinder, and each movable externally threaded sleeve fits tightly with the fixed externally threaded sleeve and the head. In addition, the limit ring cooperates with the fixing strip, and each pair of positioning columns and the positioning holes cooperates, so that when the head is rotated, the fixed externally threaded sleeve and each added movable externally threaded sleeve can rotate synchronously and be used in coordination, so that the length of the bolt can be adjusted to a certain extent to adapt to the needs of different through-hole depths, thereby enhancing the adaptability of the bolt, improving versatility, and facilitating use without affecting the efficiency of workers' fixing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0026] Figure 3 It is a schematic diagram of the top view of the limit ring of the utility model;

[0027] Figure 4 For this utility model Figure 2 The enlarged structural diagram at A in the middle;

[0028] Figure 5 For this utility model Figure 2 Enlarged structural diagram at B in the middle.

[0029] In the figure: 1. fixed cylinder; 2. external thread base; 3. fixed external thread sleeve; 4. telescopic rod; 5. movable external thread sleeve; 6. head; 7. docking hole; 8. inner groove; 9. fixing mechanism; 901. threaded rod; 902. bevel gear one; 903. bevel gear two; 904. connecting column; 905. rotating head; 906. moving plate; 907. plug column; 908. plug hole; 10. limiting ring; 11. limiting sleeve; 12. fixing strip; 13. slide groove; 14. concave hole; 15. spring; 16. positioning column; 17. positioning hole; 18. tamping hole. DETAILED DESCRIPTION

[0030] 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 in 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.

[0031] Embodiment 1:

[0032] like Figure 1-4 As shown, the utility model provides a bolt that is easy to adjust the length, including a fixed cylinder 1, an externally threaded base 2 is fixedly installed at the bottom of the fixed cylinder 1, a fixed externally threaded sleeve 3 is fixedly installed on the outside of the fixed cylinder 1, a telescopic rod 4 is inserted into the inner side of the upper end of the fixed cylinder 1, three movable externally threaded sleeves 5 are sleeved on the outer side of the telescopic rod 4, a head 6 is provided on the upper side of the telescopic rod 4, and a docking hole 7 is provided at the bottom of the head 6, the top of the telescopic rod 4 is inserted into the docking hole 7, an inner groove 8 connected with both sides of the docking hole 7 is provided on the inner side of the head 6, a fixing mechanism 9 for fixing the telescopic rod 4 is provided in the inner groove 8, and a tamping hole 18 connected to the inside is provided at the bottom of the fixed cylinder 1 and the externally threaded base 2.

[0033] Specifically, a limiting ring 10 is fixedly installed at the bottom of the telescopic rod 4, a limiting sleeve 11 is fixedly installed at the upper end of the fixed cylinder 1, fixing bars 12 are fixedly installed at both ends of the inner side of the fixed cylinder 1, and sliding grooves 13 corresponding to the sliding of the fixing bars 12 are opened on both sides of the limiting ring 10. The advantage is that the limiting sleeve 11 and the limiting ring 10 cooperate to limit the telescopic rod 4 in the fixed cylinder 1 to prevent it from being pulled out, and the fixing bars 12 cooperate with the sliding grooves 13, so that when the telescopic rod 4 is rotated, the fixed cylinder 1 also rotates synchronously.

[0034] Specifically, a concave hole 14 is formed on the inner side of the bottom of the telescopic rod 4, and a spring 15 is fixedly installed in the concave hole 14. The lower end of the spring 15 passes through the concave hole 14 and is fixedly installed on the bottom wall of the fixed tube 1. The advantage is that the spring 15 is always in a stretched state, giving a force to the telescopic rod 4 to contract into the fixed tube 1, so that each movable external threaded sleeve 5 is pressed against the fixed external threaded sleeve 3 for use.

[0035] Specifically, the thread arrangement at the connection between the fixed cylinder 1 and the external thread base 2 is continuous, and the external threads of the three movable external thread sleeves 5 are continuous with each other and with the external threads of the fixed external thread sleeve 3. The advantage is that the threads of the fixed cylinder 1, the external thread base 2 and each movable external thread sleeve 5 are continuous, and then they can be used together, wherein the number of movable external thread sleeves 5 can be selected to adjust the overall length.

[0036] Specifically, four positioning columns 16 are fixedly installed on the bottom of each movable external thread sleeve 5 and the bottom of the head 6 in a central axis symmetrical manner, and four corresponding positioning holes 17 are opened on the upper end of each movable external thread sleeve 5 and the upper end of the fixed external thread sleeve 3 in a central axis symmetrical manner. The advantage is that the positioning columns 16 and the positioning holes 17 cooperate to quickly connect the movable external thread sleeves 5, the head 6 and the fixed external thread sleeve 3 to complete the continuous connection of the outer threads.

[0037] Embodiment 2:

[0038] like Figure 5 As shown, as an improvement to the previous embodiment, the fixing mechanism 9 includes a threaded rod 901 and a bevel gear 1 902. The threaded rod 901 is rotatably mounted on the upper side of the inner groove 8. The outer sides of both ends of the threaded rod 901 are symmetrically provided with threads with opposite rotation directions, and a bevel gear 1 902 is fixedly mounted on the outer side of the middle part of the threaded rod 901. The advantage is that the rotation of the bevel gear 1 902 can drive the threaded rod 901 to rotate.

[0039] Specifically, the fixing mechanism 9 further includes a bevel gear 2 903, a connecting column 904 and a rotating head 905. The upper end of the bevel gear 1 902 is meshedly connected with the bevel gear 2 903, the upper end of the bevel gear 2 903 is fixedly installed with the connecting column 904, the upper end of the connecting column 904 passes through the inner groove 8 and is fixedly installed with the rotating head 905. The advantage is that the rotating head 905 drives the connecting column 904 to rotate, the connecting column 904 drives the bevel gear 2 903 to rotate, and thus the bevel gear 2 903 drives the bevel gear 1 902 to rotate, and the threaded rod 901 rotates accordingly.

[0040] Specifically, the fixing mechanism 9 also includes a moving plate 906, a plug post 907 and a socket 908. The moving plates 906 are symmetrically threaded on the outer sides of the two ends of the threaded rod 901. The plug posts 907 are fixedly installed on the relatively close ends of the two moving plates 906. The upper end of the telescopic rod 4 is correspondingly provided with a through socket 908. The advantage is that when the threaded rod 901 rotates, the two moving plates 906 are driven to move relatively close to each other, and the moving plates 906 push the two plug posts 907 to be inserted into the socket 908 at the upper end of the telescopic rod 4, completing the docking and fixing.

[0041] When in use, first use a tamping rod to insert it into the inner side of the fixed tube 1 from the tamping hole 18, and guide the telescopic rod 4 outward to the maximum length, then select a suitable number of movable external threaded sleeves 5 according to the depth of the through hole to be connected by the bolt, and stack them on the outer side of the telescopic rod 4, and each movable external threaded sleeve 5 is correspondingly plugged with the fixed external threaded sleeve 3, then put the head 6 on the telescopic rod 4, and make the telescopic rod 4 inserted into the head 6, and the head 6 is also plugged with the uppermost movable external threaded sleeve 5, and then rotate the head 905 to drive the connecting column 904 to rotate, and the connecting column 904 drives the bevel gear The second 903 rotates, and the bevel gear 903 drives the bevel gear 1 902 to rotate. The threaded rod 901 rotates and drives the two movable plates 906 to move relatively close to each other. The movable plate 906 pushes the two plug posts 907 to be inserted into the plug holes 908 at the upper end of the telescopic rod 4 to complete the docking and fixation. The tamping stick is removed, and under the pulling force of the extension spring 15, the movable external threaded sleeves 5, the fixed external threaded sleeves 3 and the head 6 are tightly docked, and the outer threads are continuously docked. When the head 6 is rotated, the fixed external threaded sleeve 3 and each movable external threaded sleeve 5 can be synchronously driven to rotate and screwed into the through hole.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bolt that is easy to adjust in length, comprising a fixing tube (1), Features: An externally threaded base (2) is fixedly mounted on the bottom of the fixed cylinder (1), a fixed externally threaded sleeve (3) is fixedly mounted on the outside of the fixed cylinder (1), a telescopic rod (4) is inserted into the inner side of the upper end of the fixed cylinder (1), three movable externally threaded sleeves (5) are sleeved on the outer side of the telescopic rod (4), a head (6) is arranged on the upper side of the telescopic rod (4), and a docking hole (7) is provided at the bottom of the head (6), the top end of the telescopic rod (4) is inserted into the docking hole (7), an inner groove (8) is provided on the inner side of the head (6) and is connected to both sides of the docking hole (7), a fixing mechanism (9) for fixing the telescopic rod (4) is provided in the inner groove (8), and a tamping hole (18) communicating with the inside is provided at the bottom of the fixed cylinder (1) and the externally threaded base (2).

2. A bolt that is easy to adjust in length according to claim 1, Features: A limiting ring (10) is fixedly installed at the bottom of the telescopic rod (4), a limiting sleeve (11) is fixedly installed at the upper end of the fixing tube (1), fixing strips (12) are fixedly installed at both ends of the inner side of the fixing tube (1), and sliding grooves (13) corresponding to the fixing strips (12) are provided on both sides of the limiting ring (10) for sliding through.

3. A bolt that is easy to adjust in length according to claim 2, Features: A concave hole (14) is provided on the inner side of the bottom of the telescopic rod (4), a spring (15) is fixedly installed in the concave hole (14), and the lower end of the spring (15) passes through the concave hole (14) and is fixedly installed on the bottom wall of the fixed cylinder (1).

4. A bolt that is easy to adjust in length according to claim 1, Features: The threads at the connection between the fixed cylinder (1) and the external thread base (2) are arranged continuously, and the external threads between the three movable external thread sleeves (5) and with the external threads of the fixed external thread sleeve (3) are arranged continuously.

5. A bolt that is easy to adjust in length according to claim 1, Features: The bottom of each movable external threaded sleeve (5) and the bottom of the head (6) are both symmetrically fixed with four positioning columns (16) about the central axis, and the upper end of each movable external threaded sleeve (5) and the upper end of the fixed external threaded sleeve (3) are both symmetrically provided with four corresponding positioning holes (17) about the central axis.

6. A bolt that is easy to adjust in length according to claim 1, Features: The fixing mechanism (9) comprises a threaded rod (901) and a bevel gear one (902); the threaded rod (901) is rotatably mounted on the upper side of the inner groove (8); threads with opposite rotation directions are symmetrically arranged on the outer sides of both ends of the threaded rod (901); and the bevel gear one (902) is fixedly mounted on the outer side of the middle part of the threaded rod (901).

7. A bolt that is easy to adjust in length according to claim 6, Features: The fixing mechanism (9) further comprises a second bevel gear (903), a connecting column (904) and a rotating head (905); the upper end of the first bevel gear (902) is meshingly connected with the second bevel gear (903); the upper end of the second bevel gear (903) is fixedly mounted with the connecting column (904); the upper end of the connecting column (904) passes through the inner groove (8) and is fixedly mounted with the rotating head (905).

8. A bolt that is easy to adjust in length according to claim 7, Features: The fixing mechanism (9) further comprises a movable plate (906), a plug post (907) and a socket (908); the outer sides of the two ends of the threaded rod (901) are symmetrically threadedly connected with the movable plates (906); the relatively close ends of the two movable plates (906) are fixedly mounted with the plug post (907); and the upper end of the telescopic rod (4) is correspondingly provided with a through socket (908).

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