An external brace type screw wrench

Abstract

The application relates to the technical field of manual hardware tools, in particular to an outer supporting type screw wrench which comprises a support, an adjusting disc, a screw rod and a plurality of supporting rods. One end of the screw rod is connected with the center of the support through an axial threaded hole of the adjusting disc, so that an axle distance between the support and the adjusting disc can be adjusted along the axial direction of the screw rod. The plurality of supporting rods are distributed in the circumferential direction of the support and are hinged to the end portions of the support. One end of each supporting rod extends to the space between the adjusting disc and the support and abuts against the end face of the adjusting disc, and the other end extends to the outside of the support as a force applying end. The axle distance between the adjusting disc and the support can be adjusted, so that the plurality of supporting rods can be synchronously opened and closed in the radial direction. The axle distance between the support and the adjusting disc can be flexibly adjusted through the cooperation of the screw rod and the axial threaded hole of the adjusting disc, so that the plurality of supporting rods can be synchronously opened and closed in the radial direction, and the outer supporting type screw wrench has the advantages of exquisite structure, convenient and efficient operation, strong practicability and the like.

Description

Technical Field

[0001] This application relates to the field of manual hardware tools, and in particular to an externally supported spiral wrench. Background Technology

[0002] In the field of storage and transportation of fluid media such as hydraulic oil, the discharge port of oil tanks generally adopts an embedded sealing cap design. This design plays a crucial role in ensuring the stability and safety of the medium during storage and transportation.

[0003] Currently, opening oil pipe caps or tightening large internally threaded components often requires the use of pipe wrenches, chain pliers, or custom-made tools. Pipe wrenches, as a common tool, employ a single-point clamping method to manipulate workpieces. This single-point clamping method has several drawbacks in practical use. Firstly, due to the single clamping point, the pipe wrench easily slips relative to the workpiece when torque is applied, requiring the operator to repeatedly adjust the clamping position, significantly reducing work efficiency. Secondly, the clamping area of ​​the pipe wrench is usually quite hard, causing significant damage to the workpiece surface when contacting it and applying force. This not only affects the workpiece's appearance but may also pose a potential threat to its structural strength and service life. Furthermore, pipe wrenches are inefficient in torque transmission, failing to effectively convert the force applied by the operator into torque on the workpiece, further increasing the difficulty and time cost of operation. While chain pliers can adapt to workpieces of different sizes to some extent and have a degree of versatility, their operation process is quite cumbersome. When using chain clamps, operators must first wrap the chain links around the workpiece and then adjust the tension of the links to achieve clamping. This process is not only time-consuming but also requires a high level of operator skill. More seriously, the chain links in chain clamps are prone to jamming during long-term use. When chain links jam, the clamp cannot transmit torque properly and may even cause the chain links to break, leading to safety accidents. In summary, for applications such as large oil drum caps, existing tools lack a radial synchronous support structure, resulting in low adjustment efficiency and unstable torque transmission. Furthermore, carrying multiple tool sizes increases the operational burden and operating costs. These problems severely affect the efficiency, safety, and workpiece integrity of oil drum cap opening operations.

[0004] Therefore, there is an urgent need to develop a new tool to overcome the technical challenges of low adjustment efficiency, unstable torque transmission, and poor applicability. Utility Model Content

[0005] The purpose of this application is to provide an externally supported spiral wrench to solve the problems of low adjustment efficiency, unstable support, and poor applicability in the prior art.

[0006] The embodiments of this application can be implemented through the following technical solutions:

[0007] An externally supported screw wrench includes a bracket (1), an adjustment plate (2), a screw (6), and multiple support rods (4).

[0008] One end of the screw (6) passes through the axial threaded hole of the adjusting plate (2) and is connected to the center of the bracket (1), so that the bracket (1) and the adjusting plate (2) form an adjustable axial distance along the screw (6);

[0009] Multiple support rods (4) are distributed circumferentially along the bracket (1) and hinged to the end of the bracket (1). One end of the support rod (4) extends between the adjustment plate (2) and the bracket (1) and abuts against the end face of the adjustment plate (2). The other end extends to the outside of the bracket (1) as the force-applying end. By adjusting the axial distance between the adjustment plate (2) and the bracket (1), multiple support rods (4) can be driven to open and close radially in sync.

[0010] Furthermore, the ends of the force-applying ends of the multiple support rods (4) are fitted in the same plane, and the orthographic projection points of each force-applying end form a regular geometric shape in the reference plane.

[0011] Furthermore, the bracket (1) is a triangular structure with three support rods (4) evenly distributed around its perimeter. The included angle between two adjacent support rods (4) is 120°. The middle part of each support rod (4) is movably connected to the bracket (1) through a hinge point, and the positions of the three hinge points form the three vertices of an equilateral triangle.

[0012] Furthermore, the hinge points of the three support rods (4) have equal axial lengths relative to the ends in the same direction, and the orthographic projection points of each force-applying end form a circle in the same reference plane.

[0013] Furthermore, each of the support rods (4) is provided with a plurality of adjustment holes (41) in the middle, and the bracket (1) is hinged to the support rod (4) and the adjustment holes (41) through the connector (5).

[0014] Furthermore, the bracket (1) is located below the adjusting plate (2), one end of the support rod (4) abuts against the lower end face of the adjusting plate (2), and the other end extends outward in a divergent manner below the bracket (1). One end of the screw (6) passes through the axial threaded hole of the adjusting plate (2) and is fixedly connected to the center of the bracket (1).

[0015] Furthermore, the screw (6) is welded to the bracket (1) or fixedly connected by a limiting member (7).

[0016] Furthermore, the other end of the screw (6) is fixedly connected to a drive rod (3) arranged coaxially. The outer diameter of the drive rod (3) is larger than the diameter of the axial threaded hole of the adjustment disk (2). The drive rod (3) serves as a limiting structure above the adjustment disk (2).

[0017] When the end of the drive rod (3) abuts against the upper end face of the adjustment plate (2), the axial distance between the lower end face of the adjustment plate (2) and the upper end face of the bracket (1) is less than the axial length from the adjustment hole (41) of the support rod (4) to its abutting end.

[0018] Furthermore, the end of the drive rod (3) facing away from the adjustment plate (2) is provided with a force application hole (31) for a standardized tool, and the axis of the force application hole (31) is coaxial with the axis of the screw (6).

[0019] Furthermore, the support rod (4) is a long straight rod, and the end of the support rod (4) with force application has oblique sawtooth pattern, or a silicone pad is added.

[0020] The externally supported spiral wrench provided in the embodiments of this application has at least the following beneficial effects:

[0021] The screw in this application engages with the axial threaded hole of the adjusting disc. By adjusting the axial distance between the adjusting disc and the bracket, multiple support rods can be driven to open and close radially synchronously. This allows for flexible adaptation to the diameter of embedded sealing caps of different sizes, effectively compensating for operational inconveniences caused by differences in workpiece dimensions. The structural design of the support rods abutting against the end face of the adjusting disc and hinged to the bracket provides stable support force, ensuring uniform and stable force application when opening the embedded sealing cap, avoiding skewing or shaking, reducing operational difficulty and risk, and possessing advantages such as ingenious structure, convenient and efficient operation, and strong practicality. Attached Figure Description

[0022] Figure 1 This is a front view of an externally supported spiral wrench according to this application;

[0023] Figure 2 This is a top view of an externally supported spiral wrench according to this application.

[0024] Numbers in the diagram

[0025] 1-Bracket; 2-Adjusting disc; 3-Drive rod; 4-Support rod; 41-Adjusting hole; 42-Damping part; 5-Connector; 6-Screw; 7-Limiting part. Detailed Implementation

[0026] The present application will now be further described based on preferred embodiments and with reference to the accompanying drawings.

[0027] In addition, for ease of understanding, various components on the drawings have been enlarged (thickened) or reduced (thinned), but this is not intended to limit the scope of protection of this application.

[0028] Singular forms of words also include plural meanings, and vice versa.

[0029] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, in the description of this application, in order to distinguish different units, the terms "first," "second," etc. are used in this specification, but these are not limited by the manufacturing order, nor should they be construed as indicating or implying relative importance. Their names may differ in the detailed description and claims of this application.

[0030] The vocabulary used in this specification is for illustrative purposes and is not intended to limit the scope of this application. It should also be noted that, unless otherwise expressly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection via an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of these terms in this application.

[0031] Figure 1 This is a front view of an externally supported spiral wrench according to this application, as shown. Figure 1 As shown, an externally supported screw wrench includes a bracket 1, an adjusting disc 2, a screw 6, and multiple support rods 4. One end of the screw 6 passes through the axial threaded hole of the adjusting disc 2 and is connected to the center of the bracket 1. The bracket 1 and the adjusting disc 2 have an adjustable axial distance along the screw 6. The multiple support rods 4 are distributed circumferentially along the bracket 1 and are hinged to the ends of the bracket 1. One end of each support rod 4 extends between the adjusting disc 2 and the bracket 1 and abuts against the end face of the adjusting disc 2, while the other end extends to the outside of the bracket 1 as a force-applying end. By adjusting the axial distance between the adjusting disc 2 and the bracket 1, the multiple support rods 4 are driven to open and close radially synchronously to adapt to the diameter of embedded sealing caps of different sizes, achieving stable force application and opening, and compensating for the operational inconvenience caused by differences in workpiece size.

[0032] In some preferred embodiments, the ends of the multiple support rods 4 are aligned on the same plane, and the orthographic projection points of each support rod form a regular geometric shape (such as a regular polygon, a symmetrical star, or a circle) in the reference plane, so that the line of action of the resultant force passes through the center of the plane, avoiding the generation of eccentric load moment, and ensuring universal support effect for various end cap structures, effectively solving the problem of insufficient adaptability of traditional supports due to differences in end cap shape.

[0033] In some preferred embodiments, the bracket 1 has a triangular structure with three support rods 4 evenly distributed around its perimeter. The included angle between any two adjacent support rods 4 is 120°. The middle part of each support rod 4 is connected to the bracket 1 through a hinge point. The positions of the three hinge points form the three vertices of an equilateral triangle. The equilateral triangle layout makes the hinge points of the three support rods form a stable support surface, generating a uniform triaxial force during radial expansion. Compared with the traditional double-rod or four-rod structure, this can effectively avoid the risk of slippage caused by uneven force distribution and improve torque transmission efficiency by up to 30%.

[0034] Furthermore, the hinge points of the three support rods 4 have equal axial lengths relative to the ends in the same direction, and the orthographic projection points of each force-applying end form a circle in the same reference plane, ensuring the balance of mechanical properties of the bracket in all directions and ensuring the symmetry and stability of the structure.

[0035] In some preferred embodiments, each of the support rods 4 is provided with multiple adjustment holes 41 in the middle. The bracket 1 is hinged to the support rod 4 and the adjustment holes 41 by the connector 5. By changing the position of the hinge point, a single set of support rods can cover a wider range of inner diameters and expand the range of inner diameter adaptation. Each of the support rods 4 is provided with multiple adjustment holes. Preferably, the connector 5 is a screw and nut that cooperate with each other.

[0036] In some preferred embodiments, the diameter of the adjustment hole 41 is larger than the diameter of the screw rod of the connector 5, forming a movable hinge gap, which is used to reduce friction and jamming during adjustment, reduce operating resistance, make the support rod open and close more smoothly, and improve the convenience and smoothness of wrench use.

[0037] In some preferred embodiments, the end of the support rod 4 with force application has a serrated edge, or a silicone pad is added as a damping part 42. The unidirectional serrated edge uses an acute-angled triangular tooth shape (45° - 60°), with a tooth height of 0.5 - 1.5 mm and a tooth pitch of 1 - 2 mm. The metal material is hardened (HRC55 - 60), and the pattern direction is consistent with the force application direction. The penetration depth is 0.3 - 0.8 mm, allowing it to penetrate the working surface of the oil drum cap or internal threaded parts, forming a mechanically engaged anti-slip lock. The silicone pad uses Shore A40 - 60 silicone, with a grid / concentric circle texture on the surface (depth 0.2 - 0.5 mm), and is connected by vulcanization or adhesive (strength > 50 N / cm²), with a thickness of 2 - 5 mm, providing 0.8 - 1.2 MPa pressure to increase friction.

[0038] In some preferred embodiments, the bracket 1 is located below the adjusting disk 2, one end of the support rod 4 abuts against the lower end face of the adjusting disk 2, and the other end extends outward in a divergent manner below the bracket 1 to form a stable support structure, so that the axial distance between the adjusting disk 2 and the bracket 1 can be adjusted by rotating the adjusting disk 2.

[0039] In some preferred embodiments, one end of the screw 6 passes through the axial threaded hole of the adjusting plate 2 and is fixedly connected to the center of the bracket 1. The screw 6 is welded to the bracket 1 or fixedly connected by the limiting member 7, so that the screw 6 and the bracket 1 form a "zero gap" rigid whole. When the screw 6 rotates or bears axial load, the bracket 1 can transmit force synchronously and instantly, avoiding the attenuation of support force due to loosening.

[0040] In some preferred embodiments, the limiting member 7 is composed of a high-strength retaining ring and a positioning pin. The retaining ring is sleeved on the outside of one end of the screw 6 and is located at the lower end of the bracket 1. Both the screw 6 and the retaining ring have corresponding radially penetrating pin holes. One end of the positioning pin passes through the corresponding pin hole outside the retaining ring and is fastened at the end by a hexagonal nut and a spring washer. Preferably, thread-locking adhesive can also be applied to the mating surface of the pin hole to form a dual guarantee of mechanical engagement and chemical anti-loosening, ensuring that the connection between the screw 6 and the bracket 1 is stable and reliable under complex working conditions, and effectively preventing loosening or displacement caused by vibration.

[0041] In some preferred embodiments, the other end of the screw 6 is fixedly connected to a coaxially arranged drive rod 3. The outer diameter of the drive rod 3 is larger than the diameter of the axial threaded hole of the adjusting disk 2. The drive rod 3 serves as a limiting structure above the adjusting disk 2 to prevent excessive displacement when the adjusting disk 2 rotates. Preferably, when the end of the drive rod 3 abuts against the upper end face of the adjusting disk 2, the axial distance between the lower end face of the adjusting disk 2 and the upper end face of the bracket 1 is less than the axial length from the adjusting hole 41 of the support rod 4 to its abutting end. This ensures that the support rod 4 maintains effective support during adjustment while reserving sufficient safety margin to avoid excessive adjustment causing the support rod 4 to leave the effective working area, thus ensuring the support stability and reliability of the support rod 4 within the full stroke radial support range.

[0042] In some preferred embodiments, the support rod 4 is a long straight rod. The axis of the long straight rod structure is basically consistent with the direction of force (especially axial pressure or tension), which can directly transfer the external load to the connecting parts at both ends along the axis of the rod, reducing stress concentration caused by structural bending or eccentricity. When the length of the support rod 4 is 78 mm, and the orthographic projection points of each force-applying end form a circle in the same reference plane, the minimum support radius is 65 mm and the maximum support radius is 81 mm. Different telescopic radii can be adjusted by changing the length of the support rod and the inner square main rod.

[0043] In some preferred embodiments, such as Figure 2 As shown, the end of the drive rod 3 facing away from the adjustment disc 2 is provided with a standardized tool force hole 31. The axis of the force hole 31 is coaxial with the axis of the screw 6 to ensure that the torque can be efficiently and stably transmitted to the screw 6 when the tool applies force, avoiding uneven force due to eccentricity. Preferably, the force hole 31 adopts a universal interface such as an internal hexagon, square hole or Torx hole, which is compatible with common tools such as wrenches and screwdrivers. This allows the operator to easily drive the main rod 3 to rotate using conventional tools, and realize the lifting and lowering of the adjustment disc 2 through the thread transmission of the screw 6, which greatly improves the convenience and efficiency of operation. Even in narrow spaces or complex working conditions, it can achieve fast and labor-saving adjustment.

[0044] The specific embodiments of this application have been described in detail above. For those skilled in the art, several improvements and modifications can be made to this application without departing from the principle of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An externally supported spiral wrench, characterized in that: Includes bracket (1), adjustment plate (2), screw (6) and multiple support rods (4); One end of the screw (6) passes through the axial threaded hole of the adjusting plate (2) and is connected to the center of the bracket (1), so that the bracket (1) and the adjusting plate (2) form an adjustable axial distance along the screw (6); Multiple support rods (4) are distributed circumferentially along the bracket (1) and hinged to the end of the bracket (1). One end of the support rod (4) extends between the adjustment plate (2) and the bracket (1) and abuts against the end face of the adjustment plate (2). The other end extends to the outside of the bracket (1) as the force-applying end. By adjusting the axial distance between the adjustment plate (2) and the bracket (1), multiple support rods (4) can be driven to open and close radially in sync.

2. The externally supported spiral wrench according to claim 1, characterized in that: The ends of the force-applying ends of the multiple support rods (4) are fitted in the same plane, and the orthographic projection points of each force-applying end form a regular geometric shape in the reference plane.

3. The externally supported spiral wrench according to claim 1, characterized in that: The bracket (1) is a triangular structure with three support rods (4) evenly distributed around its perimeter. The included angle between two adjacent support rods (4) is 120°. The middle part of each support rod (4) is movably connected to the bracket (1) through a hinge point, and the positions of the three hinge points form the three vertices of an equilateral triangle.

4. The externally supported spiral wrench according to claim 1, characterized in that: The hinge points of the three support rods (4) have equal axial lengths relative to the ends in the same direction, and the orthographic projection points of each force-applying end form a circle in the same reference plane.

5. The externally supported spiral wrench according to claim 1, characterized in that: Each of the support rods (4) has multiple adjustment holes (41) in the middle, and the bracket (1) is hinged to the support rod (4) and the adjustment holes (41) through the connector (5).

6. The externally supported spiral wrench according to claim 1, characterized in that: The bracket (1) is located below the adjusting plate (2). One end of the support rod (4) abuts against the lower end face of the adjusting plate (2), and the other end extends outward in a divergent manner below the bracket (1). One end of the screw (6) passes through the axial threaded hole of the adjusting plate (2) and is fixedly connected to the center of the bracket (1).

7. The externally supported spiral wrench according to claim 1, characterized in that: The screw (6) is welded to the bracket (1) or fixedly connected by a limiting member (7).

8. The externally supported spiral wrench according to claim 1, characterized in that: The other end of the screw (6) is fixedly connected to a drive rod (3) arranged on the same axis. The outer diameter of the drive rod (3) is larger than the diameter of the axial threaded hole of the adjustment disk (2). The drive rod (3) serves as a limiting structure above the adjustment disk (2). When the end of the drive rod (3) abuts against the upper end face of the adjustment plate (2), the axial distance between the lower end face of the adjustment plate (2) and the upper end face of the bracket (1) is less than the axial length from the adjustment hole (41) of the support rod (4) to its abutting end.

9. The externally supported spiral wrench according to claim 8, characterized in that: The drive rod (3) is provided with a force application hole (31) for a standardized tool at the end facing away from the adjustment plate (2), and the axis of the force application hole (31) is coaxial with the axis of the screw (6).

10. The externally supported spiral wrench according to claim 1, characterized in that: The support rod (4) is a long straight rod, and the end of the support rod (4) with force application has oblique sawtooth pattern, or a silicone pad is added.

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