Wrench for fastening bolt in narrow space

Abstract

According to the wrench for fastening the bolt in the narrow and small space, by changing the operation direction of the wrench, the mode that a traditional wrench exerts acting force on the side edge of the bolt for fastening is changed into the mode that the wrench is located over the bolt, and the main rod is telescopic. The sleeve head matched with the bolt model is arranged, the matched sleeve head is connected with the telescopic main rod in a magnetic attraction mode, the sleeve head can be detached and selected according to the bolt model in use, and the operating rod is telescopic so as to cope with a narrower space. In addition, the telescopic main rod and the cutter rod are both prismatic, so that the friction force during screwing is improved. And the cushion blocks and the adjusting mechanism are arranged, the length of the telescopic main rod is adjusted by adjusting the number of the cushion blocks between the adjusting mechanism and the cutter bar, and the telescopic main rod is locked by the adjusting mechanism, so that the telescopic main rod can be pressed downwards during screwing to better apply force. By adopting the technical scheme, the applicability of the bolt wrench in a narrow space is effectively improved; and the carrying is convenient.

Description

Technical Field

[0001] This utility model relates to the field of bolt tightening equipment, specifically to a bolt tightening wrench for confined spaces. Background Technology

[0002] In steel-concrete structures, steel column bases are often connected by bolts. How to tighten the column base bolts is the most important aspect of the steel column construction quality. However, due to the overlapping of construction processes, sometimes the reserved steel bars are too long, making it impossible to turn a traditional wrench in a limited space, which affects the installation of the steel column base. How to tighten the column base bolts in a limited space becomes the foundation for ensuring the construction quality of steel-concrete structures.

[0003] Chinese utility model patent application number 202221293927.5 discloses a bolt removal and installation tool for confined spaces, including a locking mechanism. This mechanism includes a first locking plate, with a connecting plate positioned near the right end of the lower surface of the first locking plate. A first movable groove is formed at the top of the wrench handle. The lower end of the connecting plate extends into the interior of the wrench handle through the first movable groove. A guide telescopic rod and a return spring are provided on the inner wall of the wrench handle. When removing or installing bolts in a confined space, the wrench head is positioned directly above the wrench handle. Both reversing telescopic rods are perpendicular to the upper surface of the wrench handle. Two positioning grooves are fitted onto the outside of the first locking plate to restrict the rotation of the two reversing telescopic rods, thus fixing the wrench head directly above the wrench handle, thereby reducing the space required for operation.

[0004] However, this solution still applies force from the side when in use, which is not easy to implement in the narrow spaces common in steel-concrete structures. Therefore, it is necessary to change the direction of the wrench operation, changing the traditional method of applying force to the side of the bolt to tightening it from the top of the bolt. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the aforementioned technology by proposing a bolt tightening wrench for confined spaces, aiming to solve the problem that it is inconvenient to use a bolt tightening wrench with lateral force in the confined spaces of rigid-concrete structures.

[0006] This utility model provides a bolt tightening wrench for confined spaces, including a blade, a matching socket and a magnetic block. The blade is characterized in that a magnetic block is provided at one end, which enables the matching socket to be detachably connected through magnetic attraction. A telescopic main rod for extending the operating lever is movably connected to the other end of the blade, and a telescopic handle is movably connected to the end of the telescopic main rod.

[0007] The telescopic main rod is elastically connected with an adjustment mechanism. Several pads are placed inside the telescopic main rod. The adjustment mechanism adjusts the length of the telescopic main rod by adjusting the number of pads between it and the cutter bar.

[0008] Preferably, both the cutter bar and the telescopic main rod are prismatic tubes. The end of the cutter bar near the magnetic block has a polygonal interface, and a matching sleeve is fixedly connected to a prismatic connector, which is movably inserted into the interface. The telescopic main rod consists of a first sleeve and a second sleeve. The cutter bar is fitted into the first sleeve, and the first sleeve is fitted into the second sleeve. The first sleeve and the second sleeve are connected sequentially by flanges at their ends.

[0009] Preferably, the adjustment mechanism includes a first through hole in the second sleeve, an insert plate inserted into the first through hole, a through hole opened along the thickness direction of the insert plate, a pressing plate fixedly connected to one end of the insert plate, an elastic element fixedly connected to the other end of the insert plate through the first through hole, a protective cover fixedly connected to the second sleeve, and the elastic element disposed inside the protective cover. When the elastic element is compressed, the through hole communicates with the inner channel of the second sleeve.

[0010] A slide rail is provided on the side of the insert plate near the pressing plate along the length of the insert plate. One end of the folding plate is slidably connected on the slide rail. A second sleeve is provided above the first through hole and has a second through hole. The other end of the folding plate extends into the second through hole. A protrusion is fixed on both sides of the slide rail near the through hole. The protrusion is interference-fitted with the folding plate.

[0011] Preferably, the pad is located inside the second sleeve and between the adjusting mechanism and the top of the second sleeve. The diameter of the through hole is larger than the diameter of the pad, and the diameter of the pad is smaller than the inner diameter of the first sleeve. The length of each pad is the same as the distance from the first through hole to the second through hole. The edges of the pad are chamfered to create a gap between adjacent pads.

[0012] Preferably, the telescopic handle includes a connecting sleeve, one end of which is movably connected to the end of the second sleeve or the blade, and the other end of which is fixedly connected to a sleeve. Extension rods are inserted into both ends of the sleeve, and a hand guard ball is connected to the end of the extension rod furthest from the sleeve. Both the connecting sleeve and the blade have insertion holes at their top ends, through which a pin is movably connected. A spring is fixedly connected between the pin and the outer wall of the connecting sleeve, the pin is fitted inside the spring, and a pad is stored between the pin and the insertion plate.

[0013] Preferably, a cross buckle is fixedly connected to the end of the tool holder near the first sleeve, and a slider is slidably arranged inside the first sleeve. The slider fits against the inner wall of the first sleeve, and a cross groove is opened on the side of the slider near the tool holder, and the cross buckle is engaged with the cross groove.

[0014] Compared with existing technologies, it has the following beneficial effects:

[0015] This utility model provides a bolt tightening wrench for confined spaces. By changing the operating direction of the wrench, the traditional method of applying force to the side of the bolt is changed to applying force directly above the bolt. The main rod is telescopic. It is equipped with a matching socket head cap, which is magnetically connected to the telescopic main rod. The socket head cap can be disassembled and selected according to the bolt size. The telescopic operating rod can accommodate different spaces. Furthermore, both the telescopic main rod and the wrench handle are prismatic, increasing friction during tightening. A pad and adjustment mechanism are included. The length of the telescopic main rod is adjusted by changing the number of pads between the adjustment mechanism and the wrench handle, and is locked by the adjustment mechanism. This allows for downward pressing during tightening, resulting in better force application. The above technical solution effectively improves the applicability of the bolt wrench in confined spaces; its telescopic design makes it easy to carry. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a bolt tightening wrench for confined spaces according to the present invention;

[0018] Figure 2 This is a cross-sectional view of a bolt tightening wrench for confined spaces according to the present invention;

[0019] Figure 3 This is a partially enlarged schematic diagram of part A of the present invention;

[0020] Figure 4 This is an exploded view of a bolt tightening wrench for confined spaces according to the present invention;

[0021] Figure 5 This is a schematic diagram of the adjustment mechanism of this utility model;

[0022] Figure 6 This is a partially enlarged schematic diagram of part B of the present invention;

[0023] Figure 7 This is a partially enlarged schematic diagram of part C of this utility model;

[0024] Figure 8 This is a schematic diagram of the tool holder and telescopic handle of this utility model;

[0025] Figure 9 This is a schematic diagram of the tool holder, telescopic main rod, and telescopic handle of this utility model;

[0026] Figure 10This is a cross-sectional view of the tool holder, telescopic main rod, and telescopic handle of this utility model.

[0027] In the diagram, the components are: 11 (tool bar); 111 (interface); 112 (cross buckle); 12 (matching sleeve); 121 (connector); 13 (magnetic block); 14 (telescopic main rod); 141 (first sleeve); 142 (second sleeve); 143 (flanged edge); 15 (telescopic handle); 151 (connecting sleeve); 152 (sleeve); 153 (extension rod); 154 (hand guard ball); 2 (adjustment mechanism); 21 (first through hole); 22 (insert plate); 221 (slide rail); 222 (protrusion); 23 (through hole); 24 (pressing plate); 25 (elastic element); 26 (protective cover); 27 (folding plate); 28 (second through hole); 3 (pad); 41 (insert hole); 42 (pin); 43 (spring); 5 (slider); 51 (cross groove). Detailed Implementation

[0028] To better understand the structure, functional features, and advantages of this utility model, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings:

[0029] Example:

[0030] like Figures 1 to 10 As shown, this utility model provides a bolt tightening wrench for confined spaces, including a wrench handle 11, a matching socket 12, and a magnetic block 13. The wrench handle 11 is hollow, with a partition plate fixed at the end near the matching socket 12. The partition plate is integrally formed with the wrench handle 11, separating the magnetic block 13 from the matching socket 12, allowing for detachable connection of the matching socket 12 through magnetic attraction. A telescopic main rod 14 for extending the operating arm is movably connected to the other end of the wrench handle 14, with a telescopic handle 15 movably connected to its end. The telescopic main rod 14 extends the operating arm, allowing for suitable force application in confined spaces. However, since the wrench's original perpendicular-axis force application is changed to parallel-axis force application, it should not be too long. Excessive length increases torque, making it difficult to apply force or causing the matching socket 12 to easily detach from the bolt during application. The telescopic handle 15 provides better force application after extension. Matching socket 12 comes in sockets with different inner diameters. Select the appropriate matching socket 12 according to the bolt type.

[0031] The telescopic main rod 14 is elastically connected to an adjustment mechanism 2. Several pads 3 are placed inside the telescopic main rod 14. The adjustment mechanism 2 adjusts the length of the telescopic main rod 14 by adjusting the number of pads 3 between itself and the cutter bar 11. The more pads 3 between the adjustment mechanism 2 and the cutter bar 11, the longer the distance between the adjustment mechanism 2 and the cutter bar 11, and the farther the telescopic handle 15 is from the cutter bar 11 to the matching sleeve 12. Conversely, the fewer pads 3 between the adjustment mechanism 2 and the cutter bar 11, the closer the telescopic handle 15 is to the cutter bar 11 to the matching sleeve 12.

[0032] As another embodiment, such as Figures 1 to 4 as well as Figure 7 As shown, both the tool holder 11 and the telescopic main rod 14 in this application are prismatic tubes, and their internal walls are also prismatic. Their cross-sections can be regular or irregular polygons, as long as sufficient friction is generated. The tool holder 11 has a polygonal interface 111 at one end near the magnetic block 13, and a matching sleeve 12 is fixedly connected to a prismatic connector 121, which is movably inserted into the interface 111. The connector 121 is held in place by the magnetic block 13. The telescopic main rod 14 consists of a first sleeve 141 and a second sleeve 142. The tool holder 11 is fitted into the first sleeve 141, and the first sleeve 141 is fitted into the second sleeve 142. The first sleeve 141 and the second sleeve 142 are sequentially connected by end flanges 143. The inner diameters of the tool holder 11, the first sleeve 141, and the second sleeve 142 increase progressively. The flange 143 between the first sleeve 141 and the second sleeve 142 is such that the first sleeve 141 is provided with an outwardly expanding flange 143, and the second sleeve 142 is provided with an inwardly expanding flange 143. When the first sleeve 141 and the second sleeve 142 move in opposite directions, they are engaged by the flange 143, and the flange 143 of the first sleeve 141 fits against the inner wall of the second sleeve 142.

[0033] A cross-shaped latch 112 is fixedly connected to the end of the tool holder 11 near the first sleeve 141. A slider 5 is slidably disposed inside the first sleeve 141, and the slider 5 is in contact with the inner wall of the first sleeve 141. A cross groove 51 is formed on the side of the slider 5 near the tool holder 11, and the cross-shaped latch 112 is engaged with the cross groove 51. The cross-shaped latch 112 is integrally formed with the tool holder 11. When twisting, the cross-shaped latch 112 is engaged in the cross groove 51, which can increase the friction and make the force transmission more stable when twisting.

[0034] As another embodiment, such as Figures 4 to 6As shown, the adjustment mechanism 2 of this application includes a first through hole 21 opened in the second sleeve 142. An insert plate 22 is inserted into the first through hole 21. A through hole 23 is opened along the thickness direction of the insert plate 22. One end of the insert plate 22 is connected to a pressing plate 24, and the other end of the insert plate 22 passes through the first through hole 21 and is fixedly connected to an elastic element 25. A protective cover 26 is fixedly connected to the second sleeve 142, and the elastic element 25 is disposed inside the protective cover 26. When the elastic element 25 is compressed, the through hole 23 communicates with the inner channel of the second sleeve 142. When the elastic element 25 is reset, the insert plate 22 can still pass through the first through hole 21. That is, when the bolt is twisted and pressed down, the insert plate 22 can block the pad 3 or the knife bar 11, providing resistance to downward pressure. The insert plate 22, the knife bar 11, the first sleeve 141, the second sleeve 142, and the telescopic handle 15 are all made of metal, typically alloy steel. The pressing plate 24 can be embedded in the end of the insert plate 22, screwed onto the end of the insert plate 22 by threads, or connected in other ways.

[0035] The pad 3 is located inside the second sleeve 142 and between the adjusting mechanism 2 and the top of the second sleeve 142. The diameter of the through hole 23 is larger than the diameter of the pad 3, and the diameter of the pad 3 is smaller than the inner diameter of the first sleeve 141. The length of each pad 3 is the same as the distance between the first through hole 21 and the second through hole 28. The edges of the pad 3 are chamfered to create a gap between adjacent pads 3. The elastic element 25 can be a spring 43 or a bellows or other elastic component. The protective cover 26 is fixedly connected to the outer wall of the second sleeve 142. On the side near the outer wall of the second sleeve 142, the protective cover 26 is open, and the opening communicates with the first through hole 21. A slide rail 221 is provided along the length of the insert plate 22 near the pressing plate 24. One end of the folding plate 27 is slidably connected to the slide rail 221. A second through hole 28 is provided above the first through hole 21 in the second sleeve 142. The other end of the folding plate 27 extends into the second through hole 28. A protrusion 222 is fixed to both sides of the slide rail 221 near the through hole 23. The protrusion 222 is interference-fitted with the folding plate 27. The convex surface of the protrusion 222 is hemispherical. The folding plate 27 is a right-angled folding plate 27. One end slides on the slide rail 221. A sliding plate that can slide on the slide rail 221 is fixed to this end of the folding plate 27. The slide rail 221 and the sliding plate can be concave-convex or other shapes that can move along a fixed track. The other end of the folding plate 27 is arc-shaped or pointed, which facilitates its insertion between adjacent pads 3. The tip of the folding plate 27 is closer to the pad 3 than the edge of the through hole 23 on the side closer to the pad 3.

[0036] When the pressing plate 24 is pressed, the folding plate 27 is slid between the edge of the protrusion 222 and the slide rail 221, and then the insert plate 22 is pushed towards the elastic member 25, so that the through hole 23 is aligned with the inner channel of the second sleeve 142. At the same time, the folding plate 27 is inserted between the two pads 3 above the insert plate 22, so that the pads 3 below the folding plate 27 leak from above the insert plate 22 into the first sleeve 141. When the pressing plate 24 is released, the insert plate 22 moves away from the elastic member 25 and resets, the through hole 23 is misaligned with the inner channel of the second sleeve 142, preventing the pads 3 from sliding into the first sleeve 141. At the same time, the folding plate 27 cannot separate the pads 3, and the pads 3 remain adjacent to each other. When all the pads 3 need to be reset, the folding plate 27 is slid towards the side closer to the pressing plate 24, the pressing plate 24 is pressed again, and the whole thing is inverted, so the pads 3 can be reset through the through hole 23.

[0037] As another embodiment, such as Figure 1 and Figures 8 to 10 As shown, the telescopic handle 15 of this application includes a connecting sleeve 151. One end of the connecting sleeve 151 is movably connected to the end of the second sleeve 142 or the blade 11, and the other end of the connecting sleeve 151 is fixedly connected to a sleeve 152. Extension rods 153 are inserted into both ends of the sleeve 152, and a hand guard ball 154 is connected to the end of the extension rod 153 away from the sleeve 152. Both the connecting sleeve 151 and the blade 11 have insertion holes 41 at their top ends. A pin 42 is movably connected through the connecting sleeve 151. A spring 43 is fixedly connected between the pin 42 and the outer wall of the connecting sleeve 151. The pin 42 is sleeved inside the spring 43, and a pad 3 is stored between the pin 42 and the insertion plate 22. The hand guard ball 154 can be threaded to the end of the extension rod 153 or fixed to the end of the extension rod 153.

[0038] In use, the device can be adjusted to different configurations depending on available space. For example, when there is limited vertical space, the connecting sleeve 151 can be directly fitted onto the tool holder 11 and secured by the pin 42. When there is sufficient vertical space, the first sleeve 141 and the second sleeve 142 can be connected to the tool holder 11, and the most suitable length can be adjusted using the adjusting mechanism 2. Then, the connecting sleeve 151 can be secured to the second sleeve 142 using the pin 42.

[0039] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of this utility model without departing from the scope of the technical solution of this utility model shall fall within the protection scope of this technical solution.

Claims

1. A bolt tightening wrench for confined spaces, comprising a handle (11), a matching socket (12), and a magnetic block (13), characterized in that... The tool bar (11) is provided with a magnetic block (13) at one end, and the matching sleeve (12) is detachably connected by magnetic attraction. The other end of the tool bar (11) is movably connected to a telescopic main rod (14) for extending the operating lever arm. The telescopic main rod (14) is movably connected to a telescopic handle (15) at the end. The telescopic main rod (14) is elastically connected to an adjustment mechanism (2). Several pads (3) are placed inside the telescopic main rod (14). The adjustment mechanism (2) adjusts the length of the telescopic main rod (14) by adjusting the number of pads (3) between itself and the blade (11).

2. The confined space bolt tightening wrench according to claim 1, characterized in that, Both the cutter bar (11) and the telescopic main rod (14) are prismatic tubes. The cutter bar (11) has a prismatic interface (111) at one end near the magnetic block (13). The matching sleeve (12) is fixedly connected with a prismatic connector (121), which is movably inserted into the interface (111).

3. The confined space bolt tightening wrench according to claim 2, characterized in that, The telescopic main rod (14) is composed of a first sleeve (141) and a second sleeve (142). The knife bar (11) is sleeved in the first sleeve (141), and the first sleeve (141) is sleeved in the second sleeve (142). The first sleeve (141) and the second sleeve (142) are connected sequentially by the flanges (143) at the ends.

4. The confined space bolt tightening wrench according to claim 3, characterized in that, The adjustment mechanism (2) includes a first through hole (21) opened in the second sleeve (142), a insert plate (22) is inserted into the first through hole (21), and a through hole (23) is opened along the thickness direction of the insert plate (22). A pressing plate (24) is fixedly connected to one end of the insert plate (22), and an elastic element (25) is fixedly connected to the other end of the insert plate (22) through the first through hole (21). A protective cover (26) is fixedly connected to the second sleeve (142), and the elastic element (25) is disposed in the protective cover (26). When the elastic element (25) is compressed, the through hole (23) communicates with the inner channel of the second sleeve (142).

5. The confined space bolt tightening wrench according to claim 4, characterized in that, The insert plate (22) has a slide rail (221) along its length on the side near the pressing plate (24). One end of the folding plate (27) is slidably connected to the slide rail (221). The second sleeve (142) has a second through hole (28) above the first through hole (21). The other end of the folding plate (27) extends into the second through hole (28). A protrusion (222) is fixed on both sides of the slide rail (221) near the through hole (23). The protrusion (222) is interference-fitted with the folding plate (27).

6. The confined space bolt tightening wrench according to claim 5, characterized in that, The pad (3) is located inside the second sleeve (142) and between the adjustment mechanism (2) and the top of the second sleeve (142). The diameter of the through hole (23) is larger than the diameter of the pad (3). The diameter of the pad (3) is smaller than the inner diameter of the first sleeve (141). The length of each pad (3) is the same as the distance from the first through hole (21) to the second through hole (28). The edges of the pad (3) are chamfered to create a gap between adjacent pads (3).

7. The confined space bolt tightening wrench according to claim 3, characterized in that, The telescopic handle (15) includes a connecting sleeve (151), one end of which is movably connected to the end of the second sleeve (142) or the blade (11), and the other end of the connecting sleeve (151) is fixedly connected to a sleeve (152). Extension rods (153) are inserted into both ends of the sleeve (152), and a hand guard ball (154) is connected to the end of the extension rod (153) away from the sleeve (152).

8. The confined space bolt tightening wrench according to claim 7, characterized in that, Both the connecting sleeve (151) and the knife bar (11) have insertion holes (41) at their top ends. A pin (42) is movably connected through the connecting sleeve (151). A spring (43) is fixedly connected between the pin (42) and the outer wall of the connecting sleeve (151). The pin (42) is sleeved inside the spring (43). The pad (3) is stored between the pin (42) and the insert plate (22).

9. The confined space bolt tightening wrench according to claim 3, characterized in that, The end of the cutter bar (11) near the first sleeve (141) is fixedly connected to a cross buckle (112). A slider (5) is slidably arranged inside the first sleeve (141). The slider (5) fits against the inner wall of the first sleeve (141), and a cross groove (51) is opened on the side of the slider (5) near the cutter bar (11). The cross buckle (112) is engaged with the cross groove (51).

Images