Multifunctional force limiting wrench

Abstract

The present invention provides a multifunctional force-limiting spanner, comprising a spanner body, an active spanner assembly, a force-limiting rod connecting block, a screw and a main locking nut, wherein the spanner body and the fixed spanner opening are an integral structure, the active spanner assembly is mounted on the spanner body, the spanner opening is positioned opposite to the fixed spanner opening and can slide relative to the fixed spanner opening, the force-limiting rod connecting block is mounted on the upper portion of the spanner body and is locked by a screw, one end of the screw is threadedly connected to the active spanner assembly, and the other end of the screw passes through the spanner body and is locked by the main locking nut. The present invention has a compact structure, is easy to use, and has strong versatility. The size of the spanner can be adjusted as needed, and the position of the force-limiting rod connecting block can be adjusted accordingly so that there is no eccentricity or a small eccentricity during use, thereby improving the utilization rate of the spanner, saving production costs, and reducing resource waste.

Description

Technical Field

[0001] The invention belongs to the technical field of manual mechanical tooling, and in particular relates to a multifunctional force-limiting wrench. Background Art

[0002] For aerospace systems, most products are currently moving towards lightweighting and integration. As product development progresses, requirements for performance and appearance are becoming increasingly stringent. This is particularly true for appearance and force limits. Because threaded connections are the primary connection method, force limits are added to key interfaces and joints to enhance anti-loosening and sealing performance.

[0003] Currently, some commonly used spanner sizes are available on the market, and each spanner head can only correspond to one size. Due to comprehensive considerations and limitations in product development such as structure, weight, and size, product parts cannot completely adopt commonly used spanner sizes. Therefore, it is necessary to increase the production of force-limiting spanners according to the size requirements of the product. Moreover, each spanner head can only correspond to one size, resulting in low spanner utilization. In addition, it is necessary to find the corresponding spanner head every time to use, which causes inconvenience in use and wastes raw materials. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a multifunctional force-limiting spanner, which adopts a spanner structure with adjustable size and solves the problems of low spanner utilization, inconvenience in use and waste of raw materials.

[0005] The technical solution adopted by the present invention is: a multifunctional force-limiting spanner, including a spanner body, an adjustable spanner assembly, a force-limiting rod connecting block, a screw and a main locking nut. The spanner body and the fixed spanner opening are an integrated structure, the adjustable spanner assembly is installed on the spanner body, the spanner opening is opposite to the fixed spanner opening and can slide relative to the fixed spanner opening, the force-limiting rod connecting block is installed on the upper part of the spanner body and locked by a screw, one end of the screw is threadedly connected to the adjustable spanner assembly, and the other end of the screw passes through the spanner body and is locked by the main locking nut.

[0006] Preferably, the wrench body includes a fixed wrench mouth, a wrench frame and an end stop, the fixed wrench mouth is fixedly connected to the lower left end of the wrench frame, the wrench frame is a rectangular structure, a first long groove is processed in the middle of the front of the wrench frame, a through first long hole is processed between the lower side of the first long groove and the lower end face of the wrench frame, a second long hole is processed at the upper end of the wrench frame, the second long hole is a stepped hole, the first long groove, the first long hole and the second long hole are all open ends on the right side of the wrench frame, the right side of the wrench frame is connected to the end stop, a circular hole is processed in the center of the end stop, the screw passes through the circular hole, the end stop is inserted into the right side of the wrench frame and locked by a screw, and the end stop is pressed against the right end face of the wrench frame to close the open ends of the first long groove, the first long hole and the second long hole. The first long groove, the first long hole and the second long hole on the spanner frame facilitate the assembly of the movable spanner assembly and the force-limiting rod connecting block, and enable the movable spanner assembly and the force-limiting rod connecting block to be moved and adjusted relative to the position of the fixed spanner mouth. The end stop block limits the movable spanner assembly and the force-limiting rod connecting block to prevent them from sliding out of the spanner frame.

[0007] Preferably, a third elongated hole is machined on the back of the spanner frame at the side wall of the second elongated hole, the force-limiting rod connecting block is installed in the second elongated hole at the open end on the right side of the spanner frame through the second elongated hole, the upper end of the force-limiting rod connecting block protrudes from the upper end surface of the spanner frame, the upper end of the force-limiting rod connecting block is plug-connected to the force-limiting rod, the end shape of the upper end of the force-limiting rod connecting block matches the shape of the groove at the insertion of the force-limiting rod, the end shape of the lower end of the force-limiting rod connecting block is stepped and matches the shape of the second elongated hole, the force-limiting rod connecting block is machined on the side located at the position of the third elongated hole, a screw is passed through the third elongated hole and connected to the force-limiting rod connecting block for locking. The force-limiting rod connecting block can slide left and right along the direction of the second elongated hole and the threaded hole on the force-limiting rod connecting block is exactly located within the hole range of the third elongated hole. When sliding to a specified position, the screw is threadedly connected to the threaded hole of the force-limiting rod connecting block by passing through the third elongated hole, and the end face of the screw head presses against the outer end face of the third elongated hole of the spanner frame to lock the force-limiting rod connecting block in place.

[0008] Preferably, the front of the spanner frame is provided with scales with the same scale on the upper and lower sides, the spanner end face of the fixed spanner is located at the zero point of the scale, a mark is machined on the front of the force-limiting rod connecting block at a position opposite to the scale of the upper scale, the arrow end point of the mark indicates the center line position of the force-limiting rod connecting block, the upper scale is used to determine the positioning scale of the force-limiting rod connecting block, a mark is machined on the front of the movable spanner assembly at a position opposite to the scale of the lower scale, the arrow end point of the mark indicates the spanner end face position of the movable spanner assembly, and the lower scale is used to determine the scale positioning of the movable spanner assembly. This facilitates quick adjustment of the position of the movable spanner assembly so that the spacing between it and the fixed spanner is adjusted to the desired size, and the upper force-limiting rod connecting block can be easily adjusted to 1 / 2 the spanner spacing size, that is, the center of the spacing between the movable spanner and the fixed spanner of the movable spanner assembly, through the ruler, so that the force-limiting rod has no eccentricity or small eccentricity when performing force-limiting rotation, and has a good use effect.

[0009] Preferably, the movable spanner assembly includes a rectangular block and an movable spanner mouth, the upper part of the movable spanner assembly is a rectangular block, the lower part of the movable spanner assembly is a movable spanner mouth, the height of the rectangular block is the same as the width of the first long slot, the top surface of the rectangular block is provided with a protrusion, the protrusion is located in the second long hole, the left end surface of the protrusion is located directly above or to the upper right of the end surface of the movable spanner mouth of the movable spanner assembly, the movable spanner assembly is installed into the spanner frame at the open end on the right side of the spanner frame through the second long hole, the first long slot and the first long hole, and the movable spanner mouth of the movable spanner assembly protrudes On the lower end face of the spanner frame, the movable spanner opening and the fixed spanner opening of the movable spanner assembly form a complete spanner. A through first threaded hole is machined on the rectangular block, and the locking bolt is threadedly connected to the first threaded hole. The end face of the locking bolt is pressed against the bottom surface of the first long groove to lock the rectangular block relative to the spanner frame. A second threaded hole is machined on the side opposite to the rectangular block and the end block. The position of the second threaded hole corresponds to the circular hole. One end of the screw is connected to the second threaded hole. The maximum width of the force-limiting rod connecting block is not greater than the minimum spanner opening spacing. After installation, the force-limiting rod connecting block and the protrusion share the second long hole. The force-limiting rod connecting block is located on the left side of the protrusion and their positions do not interfere. The movable spanner assembly is locked by the two-way locking structure of the locking bolt and the main locking nut to prevent the position of the movable spanner assembly from moving during use.

[0010] Preferably, a fourth long hole is machined through the right side of the first long slot along the width direction of the first long slot. The fourth long hole connects the back of the spanner frame with the first long slot. The right end of the fourth long hole is adjacent to the end stop. A secondary locking nut is installed on the screw at the fourth long hole, with the end stop interposed between the secondary locking nut and the primary locking nut. The secondary locking nut cooperates with the primary locking nut to strengthen the locking of the screw position, further increasing the stability of the overall spanner position.

[0011] Preferably, the adjustable distance between the fixed spanner and the movable spanner of the movable spanner assembly is 10 mm to 67 mm, that is, the applicable range of the spanner spacing size is 10 mm to 67 mm, thereby enhancing the versatility of the force-limiting spanner.

[0012] The beneficial effects of the present invention are: the present invention has a compact structure, is easy to use, and has strong versatility, and can meet the force limiting requirements of non-standard sizes of products. The size of the wrench head can be adjusted as needed, and the position of the force limiting rod connecting block can be adjusted accordingly so that there is no eccentricity or the eccentricity is small during use, thereby improving the utilization rate of the wrench head, saving production costs, and reducing resource waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the multi-function force-limiting wrench structure Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the maximum dimension of the spanner spacing of the multifunctional force-limiting spanner;

[0015] Figure 3 This is a schematic diagram of the minimum dimension structure of the spanner spacing of the multifunctional force-limiting spanner;

[0016] Figure 4 This is a schematic diagram of the front structure of the wrench body;

[0017] Figure 5 This is a schematic diagram of the back structure of the wrench body;

[0018] Figure 6 Schematic diagram of the side cross-section structure of the wrench body;

[0019] Figure 7 Schematic diagram of the side structure of the end block;

[0020] Figure 8 It is a front structural diagram of the movable wrench assembly;

[0021] Figure 9 It is a schematic diagram of the right side structure of the movable wrench assembly;

[0022] Figure 10 It is a side structural diagram of the force-limiting rod connecting block;

[0023] Figure 11 This is a schematic diagram of the back structure of the force-limiting rod connecting block.

[0024] Figure markings: 1-wrench body, 2-adjustable wrench assembly, 3-force limiting rod connecting block, 4-screw, 5-main locking nut, 6-secondary locking nut, 7-locking bolt, 8-force limiting rod, 11-fixed wrench, 12-wrench frame, 13-end stopper, 121-first long groove, 122-first long hole, 123-second long hole, 124-third long hole, 125-ruler, 126-fourth long hole, 131-round hole, 21-rectangular block, 22-adjustable wrench, 23-protrusion, 211-first threaded hole, 212-second threaded hole, L-wrench spacing size. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The description of the directions herein is based on the following except for special instructions. Figure 1 The viewing direction is the reference.

[0026] Example 1: Figure 1 As shown, a multifunctional force-limiting spanner comprises a spanner body 1, an adjustable spanner assembly 2, a force-limiting rod connecting block 3, a screw 4 and a main locking nut 5. The lower part of the spanner body 1 is a fixed spanner opening 11, and the adjustable spanner assembly 2 is installed on the spanner body 1. The spanner opening is opposite to the fixed spanner opening 11 and can slide left and right relative to the fixed spanner opening 11. The force-limiting rod connecting block 3 is installed on the upper part of the spanner body 1 and is locked by a screw. One end of the screw 4 is threadedly connected to the adjustable spanner assembly 2, and the other end of the screw 4 passes through the spanner body 1 and is locked by the main locking nut 5.

[0027] like Figures 4 to 6 As shown, the spanner body 1 includes a fixed spanner mouth 11, a spanner frame 12 and an end stopper 13. The fixed spanner mouth 11 is fixedly connected to the lower left end of the spanner frame 12. The spanner frame 12 is a rectangular structure with a certain thickness. A first long groove 121 is processed in the middle of the front of the spanner frame 12. The upper and lower ends of the left end of the first long groove 121 are rounded. A through first long hole 122 is processed between the lower groove surface of the first long groove 121 and the lower end surface of the spanner frame 12. One side of the first long hole 122 is connected to the first The bottom surfaces of the long slots 121 are continuously located in the same plane, and a second long hole 123 is processed on the upper end of the spanner frame 12. The second long hole 123 is a stepped hole. The upper end width of the second long hole 123 is smaller and the lower end width is larger. The side surface of the second long hole 123 with a larger width is continuously located in the same plane as the bottom surface of the first long slot 121. The first long slot 121, the first long hole 122 and the second long hole 123 are all open ends on the right side of the spanner frame 12. The right side of the spanner frame 12 is connected to the end stopper 13, as shown in FIG. Figure 7As shown, a circular hole 131 is machined in the center of the end block 13, through which the screw 4 passes. The end block 13 is inserted into the right side of the spanner frame 12 and is locked by a screw. The end block 13 presses against the right end surface of the spanner frame 12 to close the open ends of the first elongated slot 121, the first elongated hole 122, and the second elongated hole 123. The right ends of the first elongated slot 121, the first elongated hole 122, and the second elongated hole 123 on the spanner frame 12 are set as open ends to facilitate the assembly of the movable spanner assembly 2 and the force-limiting rod connecting block 3. The movable spanner assembly 2 and the force-limiting rod connecting block 3 can be moved and adjusted relative to the position of the fixed spanner opening along the length direction of the first elongated slot 121, the first elongated hole 122, and the second elongated hole 123. The end block 13 limits the movable spanner assembly 2 and the force-limiting rod connecting block 3 to prevent them from sliding out of the spanner frame 12. Scales 125 with the same scale are set on the upper and lower sides of the front of the spanner frame 12. The spanner end face of the fixed spanner 11 is located at the zero point position of the scale 125. Marks are processed on the front of the force limiting rod connecting block 3 at a position relative to the scale of the upper scale 125. The end point of the marked arrow indicates the center line position of the force limiting rod connecting block 3. The upper scale 125 is used to determine the positioning scale of the force limiting rod connecting block 3. Marks are processed on the front of the movable spanner 22 at a position relative to the scale of the lower scale 125. The end point of the marked arrow indicates the end face position of the movable spanner 22 of the movable spanner assembly 2. The lower scale is used to determine the scale positioning of the movable spanner 22. The movable spanner 22 can be quickly adjusted to the desired spacing between the spanners 11. The upper force-limiting rod connecting block 3 can be easily adjusted to one-half the spanner spacing dimension L, i.e., the center of the spacing between the movable spanner 22 of the movable spanner assembly 2 and the fixed spanner 11 of the spanner body 1, using the scale 125. This ensures that the force-limiting rod 8 has minimal or no eccentricity during force-limiting rotation. For example, if the spanner spacing dimension L is desired to be 18 mm, the arrowhead end point of the movable spanner 22 is aligned with the 18 mm scale mark on the lower scale 125, and the arrowhead end point of the force-limiting rod connecting block 3 is aligned with the 9 mm scale mark on the upper scale 125.

[0028] like Figure 5 As shown, a third long hole 124 is processed on the side wall of the second long hole 123 on the back of the head frame 12. The midline position of the third long hole 124 is exactly at the step of the second long hole 123. The force limiting rod connecting block 3 is installed into the second long hole 123 at the open end on the right side of the head frame 12 through the second long hole 123. The upper end of the force limiting rod connecting block 3 protrudes from the upper end surface of the head frame 12, and the upper end of the force limiting rod connecting block 3 is plugged and connected with the force limiting rod 8, as shown in FIG. Figure 10 and Figure 11As shown, the upper end of the force-limiting rod connecting block 3 is shaped like a cube or regular polyhedron, matching the shape of the groove at the insertion point of the force-limiting rod 8. The lower end of the force-limiting rod connecting block 3 is stepped to match the shape of the second slot 123. A threaded hole is machined on the side of the force-limiting rod connecting block 3 at a height corresponding to the third slot 124. A screw passes through the third slot 124 to connect with the force-limiting rod connecting block 3 for locking. The force-limiting rod connecting block 3 can slide left and right along the direction of the second slot 123, and the threaded hole in the force-limiting rod connecting block 3 is precisely located within the range of the third slot 124. When slid to a desired position, the screw passes through the third slot 124 and is threadedly connected to the threaded hole of the force-limiting rod connecting block 3. The end face of the screw head contacts the outer end face of the third slot 124 of the spanner frame 12, locking the force-limiting rod connecting block 3 in place. The maximum width of the force-limiting rod connecting block 3 in the width direction is no greater than the minimum value of the spanner gap dimension L.

[0029] like Figure 8 and Figure 9As shown, the movable spanner assembly 2 includes a rectangular block 21 and an movable spanner 22. The upper part of the movable spanner assembly 2 is the rectangular block 21, and the lower part of the movable spanner assembly 2 is the movable spanner 22. The height of the rectangular block 21 is the same as the width of the first long slot 121. The top surface of the rectangular block 21 is provided with a protrusion 23. The back of the protrusion 23 is aligned with the back of the rectangular block 21. The front of the protrusion 23 is lower than the front of the rectangular block 21, forming a slider structure in which the protrusion 23 at the upper end and the movable spanner 22 at the lower end are respectively located in the second long hole 123 and the first long hole 122. The rectangular block 21 is embedded in the first long slot 121. The left end face of the protrusion 23 is located directly above or to the upper right of the end face of the movable spanner 22 of the movable spanner assembly 2. In this way, after installation, the force limiting rod connecting block 3 and the protrusion 23 share the second long hole 123. The force limiting rod connecting block 3 is located on the left side of the protrusion 23. Even if the spanner spacing size L is selected to the minimum size position, no interference will occur. The movable spanner assembly 2 is installed into the spanner frame 12 at the open end on the right side of the spanner frame 12 through the second long hole 123, the first long groove 121 and the first long hole 122. The movable spanner opening 22 of the movable spanner assembly 2 protrudes from the lower end surface of the spanner frame 12. The movable spanner opening 22 of the movable spanner assembly 2 and the fixed spanner opening 11 form a complete spanner. A through first threaded hole 211 is processed on the rectangular block 21. The locking bolt 7 is threadedly connected to the first threaded hole 211. The end face of the locking bolt 7 is pressed against the bottom surface of the first long groove 121 to tighten the torque The rectangular block 21 is locked and positioned relative to the spanner frame 12 in a direction perpendicular to the front of the spanner frame 12. A second threaded hole 212 is machined on the side opposite the rectangular block 21 and the end block 13. The position of the second threaded hole 212 corresponds to the circular hole 131. One end of the screw rod 4 is threadedly connected to the second threaded hole 212, and the other end passes through the circular hole 131 and extends out of the right end of the end block 13. A main locking nut 5 is installed on the two 4 on the right end of the end block 13. The main locking nut 5 is used to lock the rectangular block in position along the axial direction of the screw rod 4. The two-way locking structure of the locking bolt 7 and the main locking nut 5 jointly locks the movable spanner assembly 2, preventing the movable spanner assembly from moving during use, and achieving a stronger locking effect.

[0030] like Figure 2 and Figure 3 As shown, the adjustable distance between the fixed spanner 11 and the movable spanner 22 of the movable spanner assembly 2 is 10 mm to 67 mm, that is, the spanner spacing dimension L has an applicable range of 10 mm to 67 mm, thereby enhancing the versatility of the force-limiting spanner. The size range can also be expanded according to work needs. In addition, it can be manufactured in sections. For example, when it is divided into three sections, the size range can be selected from 10 mm to 25 mm, 25 mm to 45 mm, and 45 mm to 67 mm. After manufacturing in this way, the total length of the spanner with a small adjustable distance range is smaller, the space occupied is smaller, and it is more suitable for use when the force-limiting space is limited, and the versatility is stronger.

[0031] Example 2: Based on Example 1, a fourth elongated hole 126 and a secondary locking nut 6 are added. Specifically, a fourth elongated hole 126 is machined through the right side of the first elongated slot 121 along the width of the first elongated slot 121. The fourth elongated hole 126 connects the back of the spanner frame 12 with the first elongated slot 121. The right end of the fourth elongated hole 126 is adjacent to the end block 13. The secondary locking nut 6 is installed on the screw rod 4 to the left of the end block 13, located at the fourth elongated hole 126. The end block 13 is interposed between the secondary locking nut 6 and the primary locking nut 5. The secondary locking nut 6 cooperates with the primary locking nut 5 to strengthen the locking and fixation of the screw rod 4, further increasing the stability of the overall spanner position.

[0032] The above are specific embodiments of the present invention and the technical principles used. Any modifications or equivalent transformations based on the technical solutions of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multifunctional force-limiting wrench, characterized by: The cam is secured to the cam body by a screw thread, and the cam has a central locking nut that allows the cam to slide relative to the fixed head when the cam is engaged. The force limiting rod connecting block is processed with a threaded hole on the side located at the third long hole position, and the screw passes through the third long hole and is connected to the force limiting rod connecting block for locking.

2. The multifunctional force-limiting wrench according to claim 1, characterized in that: Scales with the same scale are provided on the upper and lower sides of the front face of the spanner frame. The spanner end face of the fixed spanner is located at the zero point of the scale. A mark is processed on the front face of the force limiting rod connecting block at a position opposite to the scale of the upper scale. The end point of the marked arrow indicates the center line position of the force limiting rod connecting block. The upper scale is used to determine the positioning scale of the force limiting rod connecting block. A mark is processed on the front face of the movable spanner assembly at a position opposite to the scale of the lower scale. The end point of the marked arrow indicates the position of the movable spanner end face of the movable spanner assembly. The lower scale is used to determine the scale positioning of the movable spanner assembly.

3. The multifunctional force-limiting wrench according to claim 2, characterized in that: The movable spanner assembly includes a rectangular block and an movable spanner mouth. The upper part of the movable spanner assembly is a rectangular block, and the lower part of the movable spanner assembly is a movable spanner mouth. The height of the rectangular block is the same as the width of the first long slot. The top surface of the rectangular block is provided with a protrusion, and the protrusion is located in the second long hole. The left end surface of the protrusion is located just above or to the upper right of the end surface of the movable spanner mouth of the movable spanner assembly. The movable spanner assembly is installed into the spanner frame at the open end on the right side of the spanner frame through the second long hole, the first long slot and the first long hole. The movable spanner mouth of the movable spanner assembly protrudes from the spanner mouth. On the lower end face of the head frame, the movable spanner of the movable spanner assembly and the fixed spanner form a complete spanner. A first threaded hole is processed on the rectangular block, and the locking bolt is threadedly connected to the first threaded hole. The end face of the locking bolt is pressed against the bottom surface of the first long groove to lock the rectangular block relative to the spanner frame. A second threaded hole is processed on the opposite side of the rectangular block and the end stop block. The position of the second threaded hole corresponds to the circular hole. One end of the screw is connected to the second threaded hole. The maximum width of the force limiting rod connecting block is not greater than the minimum value of the spanner spacing size.

4. The multifunctional force-limiting wrench according to claim 1, characterized in that: The first long slot is machined with a fourth long hole on the right side along the width direction of the first long slot. The fourth long hole connects the back side of the wrench frame with the first long slot. The right end of the fourth long hole is adjacent to the end stop. A secondary locking nut is installed on the screw at the fourth long hole, and an end stop is spaced between the secondary locking nut and the main locking nut.

5. The multifunctional force-limiting wrench according to claim 3, characterized in that: The adjustable distance between the fixed spanner and the movable spanner of the movable spanner head assembly is 10 mm to 67 mm, that is, the applicable range of the spanner spacing size is 10 mm to 67 mm.

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