An inner-templet automatic size-adjusting inner-templet wrench

Abstract

The utility model relates to a kind of inner wire spanner of inside support type automatic size adjustment, its core includes driving gear, three driven wheel arms, upper and lower fixed plate, gear shaft, arc tooth block and fixed bolt;Driving gear is based on planetary gear principle, and is engaged with three equidistant distribution driven wheel arms by gear shaft. The head of driven wheel arm is gear, middle section adopts concave arc design, terminal connects replaceable arc tooth block, and upper and lower fixed plate is wrapped driving gear and wheel arm assembly to be positioned. The spanner can automatically adjust opening size, and the middle part of driving gear is provided with through link shaft, which can be adapted to manual tight wheel handle or electric spanner drive. Its design can realize self-adjusting size. It is suitable for oil tank inner cover opening, pipeline inner wire fastening and other closed scenes requiring internal support, effectively solves the problem that traditional tool cannot self-adapting expansion, easy to slip and damage workpiece.

Description

Technical Field

[0001] This utility model relates to the technical field of manual hardware tools, specifically an internally supported automatic size-adjustable internal thread wrench. It achieves stepless size adjustment through a radial synchronous expansion mechanism and is specially designed for operation scenarios requiring internal support, such as opening the inner lid of a sealed container or tightening the internal threads of a pipe. Background Technology

[0002] Currently, opening embedded sealing caps on oil drums or fastening large internally threaded components (such as tank bodies and pipe threads) mainly relies on pipe wrenches, chain pliers, or custom-made tools. However, these tools have significant drawbacks: poor size adaptability (traditional fixing tools require carrying multiple sizes, and chain pliers are cumbersome and time-consuming to adjust); mechanical limitations leading to unstable torque transmission (the single-point clamping of pipe wrenches and the outer-coil winding of chain pliers cannot provide radial internal support force, easily slipping and failing, and having low torque transmission efficiency); and high risk of damage (tool slippage or hard clamping parts can easily scratch the workpiece threads and sealing surfaces, and chain pliers also have the risk of chain link jamming and breakage). Existing tools generally lack automatic size adjustment capabilities and synchronous radial internal support structures, resulting in low work efficiency and heavy operational burden.

[0003] Therefore, there is an urgent need to develop a new integrated tool that can automatically adjust dimensions and provide synchronous radial internal support force to overcome these technical challenges. Summary of the Invention

[0004] The purpose of this application is to provide an internally supported automatic size-adjusting internal thread wrench to solve the problems of low adjustment efficiency, unstable support, and poor applicability in the prior art.

[0005] The embodiments of this application can be implemented through the following technical solutions:

[0006] An internally supported, automatically adjustable internal thread wrench includes an upper fixed plate and a lower fixed plate (3), a driving gear (1), a gear shaft (4), multiple driven wheel arms (2), an arc-shaped toothed block (5), and a fixing bolt (6); the upper fixed plate and the lower fixed plate (3) are arranged in parallel to form an assembly cavity; the driving gear (1) is centrally installed in the assembly cavity through the gear shaft (4); the multiple driven wheel arms (2) are evenly distributed around the driving gear (1) (preferably three, equidistant at 120° intervals), and each driven wheel arm (2) has an integrally formed head. The device consists of a gear segment, a concave arc arm in the middle section, and a tail module interface. The head gear segment meshes with the driving gear (1) to form a planetary gear system. The concave arc arm in the middle section extends vertically by 90° from the head gear segment to form a force transmission arm. The tail module interface is connected to a replaceable arc-shaped tooth block (5) by a fixing bolt (6). Rotating the driving gear (1) drives the head gear segments of multiple driven wheel arms (2) to move synchronously. The rotational displacement is converted into the radial displacement of the tail through the concave arc arm in the middle section, which drives multiple arc-shaped tooth blocks (5) to expand or contract radially synchronously and steplessly.

[0007] Furthermore, the driving gear (1) is provided with a through-type connecting shaft in the middle for adapting to the torque input of a manual tensioner handle or an electric wrench. Furthermore, the arc-shaped tooth block (5) is a modular and replaceable structure, and its working surface is set to one of the following: sawtooth type, knurled type, or rubber-coated type.

[0008] Furthermore, the length of the concave arc-shaped arm in the middle section is 65mm, and the opening and closing range formed by the driving arc-shaped tooth block (5) is 130-175mm. Furthermore, the head gear segments of the multiple driven wheel arms (2) simultaneously mesh with the driving gear (1), so that the input torque is evenly distributed to the multiple arc-shaped tooth blocks (5).

[0009] Furthermore, the upper fixed plate and the lower fixed plate (3) form a rigid frame through the gear shaft (4), which constrains the axial displacement of the driven wheel arm (2) and enhances the stability of torque transmission. Furthermore, the 90° vertical extension structure of the middle concave arc arm forms a short lever arm force transmission path.

[0010] The embodiments of this application provide an internally supported, automatically adjusting internal thread wrench with at least the following beneficial effects:

[0011] This application utilizes a rotating drive gear to drive the synchronous movement of multiple driven wheel arm head gear segments. A concave arc-shaped arm extending vertically at 90° in the middle section efficiently converts rotational displacement into radial displacement, achieving synchronous, stepless radial expansion of multiple arc-shaped tooth blocks. This allows for flexible adaptation to workpieces with different inner diameters (such as non-standard pipe threads and oil can sealing caps), effectively compensating for operational inconveniences caused by workpiece size differences. The planetary gear meshing structure, combined with three symmetrically distributed arc-shaped tooth blocks at 120°, ensures uniform distribution of internal support force and torque load distribution. Combined with the rigid frame formed by the upper and lower fixed plates and gear shaft, and the efficient force transmission path formed by the short lever arm in the middle arc-shaped arm, it significantly improves torque transmission stability and efficiency, preventing slippage failure. The modular arc-shaped tooth block design (which can be replaced with serrated, knurled, or rubber-coated types) provides targeted clamping surfaces, meeting high torque requirements while preventing workpiece surface damage, achieving multiple uses (internal thread tightening, sealing cap opening, etc.). It boasts advantages such as fast adaptive adjustment, stable and reliable support, convenient and efficient operation, diverse functions, and workpiece protection. Attached Figure Description

[0012] Figure 1 This is the front view of the present invention.

[0013] Figure 2 for Figure 1 Top view.

[0014] The markings in the diagram are: 1. Driving gear, 2. Driven gear arm, 3. Upper and lower fixing plates, 4. Gear shaft, 5. Arc-shaped tooth block, 6. Fixing bolt. Detailed Implementation

[0015] The present application will be further described below based on preferred embodiments and with reference to the accompanying drawings. Furthermore, for ease of understanding, various components in the drawings have been enlarged (thickened) or reduced (thinned), but this is not intended to limit the scope of protection of this application. Singular forms of words also include plural meanings, and vice versa.

[0016] 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.

[0017] 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.

[0018] Figure 1 This is a front view of an internally supported, automatically adjusting internal thread wrench according to this application. Figure 2 for Figure 1 A top view. (e.g.) Figure 1 and Figure 2 As shown, an internally supported automatic adjustable internal thread wrench includes a driving gear (1), three driven wheel arms (2) equidistantly distributed at 120° intervals, an upper fixed plate and a lower fixed plate (3), a gear shaft (4), an arc-shaped tooth block (5), and a fixing bolt (6); the upper fixed plate and the lower fixed plate (3) are arranged in parallel to form an assembly cavity; the driving gear (1) is centrally installed in the assembly cavity through the gear shaft (4); each driven wheel arm (2) is composed of an integrally formed head gear segment, a middle concave arc-shaped arm, and a tail module interface; the head gear segment meshes with the driving gear (1) to form a planetary mechanism. Gear train; the concave arc arm in the middle section extends vertically by 90° from the head gear section to form a force transmission arm; the tail module interface is connected to a replaceable arc-shaped tooth block (5) by a fixing bolt (6); rotating the driving gear (1) drives the head gear sections of the three driven wheel arms (2) to move synchronously, and converts the rotational displacement into the tail radial displacement through the concave arc arm in the middle section, driving the three arc-shaped tooth blocks (5) to expand or contract synchronously in a stepless radial manner, so as to adapt to embedded sealing caps or internal threaded parts with different inner diameters, realize stable internal support force, and effectively solve the problems of poor adaptability, slippage and damage caused by differences in workpiece size.

[0019] In some preferred embodiments, the drive gear (1) has a through-type connecting shaft in the middle, which is used to adapt to the torque input of a manual tensioner handle or an electric wrench, providing a convenient power access method.

[0020] In some preferred embodiments, the arc-shaped toothed block (5) is a modular and replaceable structure, with its working surface configured as one of serrated, knurled, or rubber-coated types. The serrated toothed block has an acute-angled tooth shape (tooth height 0.5-1.5mm, tooth pitch 1-2mm) and is metal-hardened (HRC55-60), suitable for inserting into hard sealing caps to provide anti-slip locking; the knurled toothed block has a fine cross-texture (texture depth 0.1-0.3mm) on its surface, providing high friction while reducing scratches; the rubber-coated toothed block uses a silicone layer (thickness 2-5mm) with a Shore hardness of A40-60, and has a grid / concentric circle texture (depth 0.2-0.5mm) on its surface, fixed by vulcanization or adhesive (bonding strength >50N / cm²), providing scratch-free clamping for the surface of vulnerable workpieces.

[0021] In some preferred embodiments, the length of the concave arc arm in the middle section is 65 mm, and the opening and closing range formed by the driving arc tooth block (5) is 130-175 mm. By changing the length of the concave arc arm in the middle section or the size of the driving gear (1), different radial opening and closing ranges can be achieved, enhancing the applicability of the tool.

[0022] In some preferred embodiments, the planetary gear system is configured such that the driving gear (1) simultaneously meshes with the head gear segments of the three driven gear arms (2), so that the input torque is evenly distributed to the three arc-shaped tooth blocks (5), ensuring that the three-point support force is evenly distributed, avoiding uneven load slippage, and significantly improving torque transmission efficiency and stability.

[0023] In some preferred embodiments, the upper fixed plate and the lower fixed plate (3) form a rigid frame through the gear shaft (4), which effectively constrains the axial displacement of the driven wheel arm (2), prevents axial movement during operation, and significantly enhances the rigidity and torque transmission stability of the overall structure.

[0024] In some preferred embodiments, the 90° vertical extension structure of the concave arc arm in the middle section forms a short lever arm force transmission path, which efficiently converts the input torque of the planetary gear train into radial internal support force, reduces energy loss, and improves the ease of operation.

[0025] 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 internally supported, automatically adjusting internal thread wrench, characterized in that: include: The assembly consists of a drive gear (1), three driven arms (2) equidistantly distributed at 120° intervals, an upper fixed plate and a lower fixed plate (3), a gear shaft (4), an arc-shaped tooth block (5), and a fixing bolt (6). The upper fixed plate and the lower fixed plate (3) are arranged in parallel to form an assembly cavity. The drive gear (1) is installed in the assembly cavity through the gear shaft (4). Each driven arm (2) is composed of an integrally formed head gear segment, a middle concave arc arm, and a tail module interface. The head gear segment meshes with the drive gear (1) to form a planetary gear system. The middle concave arc arm extends vertically 90° from the head gear segment to form a force transmission arm. The tail module interface is connected to a replaceable arc-shaped tooth block (5) through the fixing bolt (6). The rotating drive gear (1) drives the head gear segments of the three driven arms (2) to move synchronously. The rotational displacement is converted into the tail radial displacement through the middle concave arc arm, realizing the synchronous stepless radial expansion of the arc-shaped tooth block (5).

2. The internally supported automatic size-adjusting internal thread wrench according to claim 1, characterized in that: The drive gear (1) has a through-type connecting shaft in the middle, which is used to adapt to the torque input of a manual tensioner handle or an electric wrench.

3. The internally supported automatic size-adjusting internal thread wrench according to claim 1, characterized in that: The arc-shaped toothed block (5) is a modular and replaceable structure, and its working surface is set to one of the following: sawtooth type, knurled type or rubber-coated type.

4. The internally supported automatic size-adjusting internal thread wrench according to claim 1, characterized in that: The length of the concave arc arm in the middle section is 65mm, and the opening and closing range formed by the driving arc tooth block (5) is 130-175mm.

5. The internally supported automatic size-adjusting internal thread wrench according to claim 1, characterized in that: The planetary gear system configuration is as follows: the driving gear (1) simultaneously meshes with the head gear segments of the three driven gear arms (2), so that the input torque is evenly distributed to the three arc-shaped tooth blocks (5).

6. The internally supported automatic size-adjusting internal thread wrench according to claim 1, characterized in that: The upper fixed plate and the lower fixed plate (3) form a rigid frame through the gear shaft (4), which constrains the axial displacement of the driven wheel arm (2) and enhances the stability of torque transmission.

7. The internally supported automatic size-adjusting internal thread wrench according to claim 1, characterized in that: The 90° vertical extension structure of the concave arc arm in the middle section forms a short lever arm force transmission path, which efficiently converts the input torque of the planetary gear system into radial internal support force.

Images