TWI875547B - Smooth torque tool - Google Patents

Abstract

A torque tool includes a hollow head and a rotating unit. The hollow head includes a wall extending around a chamber. The rotating unit includes notches cut in a periphery. The rotor is located in the chamber. An area of contact of the periphery of the rotor with the wall around the chamber in the hollow head is reduced by the notches.

Description

Improved torque wrench

The present invention relates to the field of tools, and in particular to a torque wrench with an improved structure.

As shown in FIG. 5 , Taiwan Patent No. I457207 proposes a torque wrench 90 , including: an adjustment mechanism 86 , a tube 91 , a shaft 92 , a head 93 , a rod 95 , and a brake assembly 97 .

The head 93 has a fitting section 94 extending from the outside, and the fitting section 94 is fitted on the tube mouth of the tube body 91. The shaft 92 passes through the fitting section 94 and the tube body 91. The head 93 fixes the tube body 91, and the two cannot swing relative to each other. An arc head 96 is formed at one end of the rod 95, and the other end is inserted into the tube body 91. The shaft 92 passes through the rod 95, so that the arc head 96 extends out of the tube body 91 and enters the head 93. The adjustment mechanism 86 is installed in the tube body 91 and pushes against the rod 95 to penetrate into the end of the tube body 91.

The brake assembly 97 includes an operating member 88 and a detent rod (not numbered). The detent rod is mounted on the head 93. A deflection portion 98 extends from the side of the detent rod, and a driving arc groove 99 is formed on the surface of the deflection portion 98 to receive the arc head 96. The operating member 88 determines that the brake assembly 97 is combined with a workpiece, such as a screw, a nut or other screw-connecting element, through the detent rod.

When in use, the tube 91 receives a force, and the product of the force and a distance from the head 93 is regarded as a moment (also called torque), which is sufficient to tighten or loosen the workpiece. When tightening or loosening, a reaction force of the workpiece is output to the deflection portion 98, driving the rod 95 to push the adjustment mechanism 86 away, hitting the tube 91 to emit a sound, reminding a user operating the torque wrench 90 to pay attention to the maximum critical value of the torque.

However, the coaxial rotation relationship between the lever and the head 93 is mainly dependent on a set of bushings (not shown, see patent No. 1457207). The friction generated by the surface-to-surface contact not only affects the rotation of the lever, but also has the possibility of offsetting part of the torque of the torque wrench 90.

In view of this, how to overcome the wear of some structures under the premise of coaxial rotation has become an urgent problem to be solved in the present invention.

Therefore, the inventor of this case proposed a new torque wrench, the main purpose of which is to adopt a mechanical structure that reduces the friction area, maintain the functional effect of coaxial rotation, and improve the disadvantages of the previous technology.

In order to achieve the above-mentioned purpose, the torque wrench of the present invention includes: a head portion, which forms an assembly chamber; and a cover body, one side of which forms a plurality of concave surfaces and a plurality of convex surfaces alternately.

The cover is placed in the assembly chamber, each of the concave curved surfaces reduces the friction area between the wall of the head and the cover, and each of the convex curved surfaces maintains the coaxial rotation relationship between the head and the cover, thereby improving the disadvantages of the prior art.

Preferably, the head extends a sleeve section, the sleeve section leads to the assembly chamber. The other side of the cover body protrudes a deflection portion, and the cover body is placed in the assembly chamber in a manner that the deflection portion faces the sleeve section.

Preferably, the sleeve section is coupled to a tube.

Preferably, a rod is pivotally connected to the inside of the tube, one end of which extends out of the tube and enters the assembly chamber to maintain a mechanical linkage relationship with the deflection portion.

Preferably, the other end of the rod is connected to an adjustment mechanism installed inside the tube and remains stationary.

In order to make the purpose, features and advantages of the present invention more clearly understood, one or more preferred embodiments are described in detail below with reference to the accompanying drawings.

Next, the embodiments of the present invention are described in conjunction with the attached drawings. In the attached drawings, the same reference numerals are used to represent the same or similar structures or units. It is foreseeable that the embodiments described are only examples of part of the present invention, not all of the embodiments. Other embodiments can be derived based on the examples described, or structures that are modified or changed as needed are all within the scope of protection of the present invention.

In the following description, directional terms such as "upper", "lower", "left", "right", "front", "back", "inner", "outer" and "side" are only used to refer to the directions of the attached drawings. The use of directional terms is for better and clearer description and understanding of the present invention, and does not express or imply that the device or component described must have a specific orientation, structure and operation, so it should not be understood as a limitation on the technical content of the present invention.

Unless otherwise specified and clearly defined, in the following description, "installed", "connected", "connected" or "provided on" should be understood in a broad sense, such as fixed connection, detachable connection, integral connection, mechanical connection, direct connection, indirect connection or connection between two components. For those skilled in the art, the above terms in various embodiments and even the specific meanings of this case can be understood by ordinary knowledge or experience.

Unless otherwise specified, in the following description, "plurality" means two or more.

As shown in Figures 1 to 4, a preferred embodiment of the present invention shows a torque wrench 10 including: a tube 11, a shaft 12, a head 13, a rod 20 and a brake assembly 30.

In this embodiment, the tube body 11 is a straight tube, and an adjustment mechanism (not shown) is installed inside the straight tube.

The head 13 is a hollow shell, which forms an assembly chamber 18. A sleeve section 14 extends from the side of the head 13, and the sleeve section 14 is hollow inside and communicates with the assembly chamber 18. The sleeve section 14 sleeves a tube opening of the tube body 11 and is passed through by the shaft 12. The head 13 is combined with the tube body 11 to form a whole, and the two cannot swing relative to each other to avoid unnecessary wear.

In the present embodiment, the shaft 12 is a rivet. In some embodiments, the shaft 12 includes, but is not limited to: a screw, a bolt, a nut (also known as a nut), a stud, a self-tapping screw, a washer, a retaining ring (also known as a retaining ring), a pin or a combination thereof.

The rod 20 is inserted into the tube 11 and passed through by the shaft 12, so the rod 20 swings relative to the tube 11 around the shaft 12. One end of the rod 20 that penetrates into the tube 11 abuts against the adjustment mechanism, so that the rod 20 remains stationary in the tube 11 (see the solid line portion of FIG. 3 ).

The rod 20 extends out of the tube body 11 and enters the other end of the assembly chamber 18, and includes: a convex portion 21, a concave portion 22, a notch 24 and a wear-resistant unit 25. The concave portion 22 forms one side of the end of the rod 20, and the rest of the same end of the rod 20 is regarded as the convex portion 21. In other words, the convex portion 21 and the concave portion 22 are on both sides of the end of the rod 20 and enter the assembly chamber 18 of the tube body 11 at the same time. The notch 24 is sunken into an edge 23 of the convex portion 21. The wear-resistant unit 25 is partially embedded in the notch 24, and the rest of the convex portion protrudes from the edge 23 of the convex portion 21 and exposes the concave portion 22.

The brake assembly 30 includes a main body, a square column 15 , a steel ball 16 , an operating member 17 and a cover 36 .

In this embodiment, the cover 36 is formed with a plurality of alternate concave surfaces 37 and a plurality of convex surfaces 38 on one side, and a deflection portion 31 is extended on the other side. The cover 36 is placed in the assembly chamber 18 in a manner that the deflection portion 31 faces the sleeve section 14. The head 13 surrounds the wall 19 of the assembly chamber 18 and contacts the convex surfaces 38 in the circumferential direction, so that the cover 36 and the head 13 maintain a coaxial rotation relationship with each other. The concave surfaces 37 do not contact the wall 19, which can reduce the friction area between the cover 36 and the head 13.

The deflecting portion 31 includes: a slot 32, a long arm 33 and a short arm 34. The slot 32 is sunken into the end surface of the deflecting portion 31, and the slot opening faces the sleeve section 14. The long and short arms 33 and 34 are designed as a whole with the deflecting portion 31, and protrude from the two sides (or the top and the bottom) of the slot 32 respectively. The short arm 34 and the long arm 33 are parallel to each other. The side of the long arm 33 facing the short arm 34 is defined as the inner side 35, and the back side of the long arm 33 is regarded as the outer side and keeps a distance from the wall 19 of the head 13.

The concave portion 22 receives the long arm 33. The convex portion 21 is placed in the groove 32 and is located between the long arm 33 and the short arm 34. The wear-resistant unit 25 contacts the inner side 35 of the long arm 33, so that the long arm 33 and the convex portion 21 maintain a mechanical linkage relationship.

The main body adopts a combination of a ratchet and a latch arm, or the latch rod. The main body is installed in the cover 36, and they have a synchronous movement connection relationship.

The square column 15 is combined with the main body and extends out of one side (or below) of the head 13. The square column 15 is inserted into a workpiece, such as a sleeve, a connecting rod, a screw, a nut or other screw-connecting elements.

The steel ball 16 is partially embedded in the square column 15 , and the remaining portion can be exposed or retracted into the square column 15 .

The operating member 17 passes through the head 13, the cover 36, and the main body and enters the square column 15 to push the steel ball 16 to protrude outward and clamp the workpiece. The operating member 17 is displaced relative to the square column 15, so that the steel ball 16 retreats into the square column 15 and releases the clamping relationship.

The tube body 81 receives an applied force F (see FIG. 3 ), and rotates together with the head 13. The torque of the torque wrench 10 is output to the brake assembly 30 through the rod 20, and the workpiece is locked or loosened through the main body. The reaction force of the workpiece is reflected to the brake assembly 30, and becomes a resistance force P output to the long arm 33 through the deflection portion 31. The resistance force P is greater than the force of the adjustment mechanism, and the long arm 33 moves from the solid line position to the dotted line position. The short arm 34 does not interfere with the rod 20 hitting the tube body 11 to make a sound, reminding a user (not shown) operating the torque wrench 10 to pay attention to the maximum critical value of the torque.

In summary, the head 13 and the cover 36 coaxially rotate with each other around the operating member 17. Each concave surface 37 reduces the friction area between the wall 19 of the head 13 and the cover 36, and retains the mechanical structure of the wall 19 contacting each convex surface 38, which is sufficient to improve the disadvantages of the prior art.

Without departing from the broad concept of this case, those skilled in the art can understand and make changes to the above embodiments. Therefore, this case is not limited to the specific embodiments disclosed in the specification, and all modifications made according to the spirit and technical scope of this case should be covered and protected by the text content defined in the scope of the patent application.

[Prior art] 86: Adjustment mechanism 88: Operating member 90: Torque wrench 91: Tube 92: Shaft 93: Head 94: Fitting section 95: Rod 96: Arc head 97: Braking assembly 98: Deflection section 99: Driving arc groove [Present invention] 10: Torque wrench 11: Tube 12: Shaft 13: Head 14: Fitting section 15: Square column 16: Steel ball 17: Operating member 18: Assembly chamber 19: Wall 20: Rod 21: Protrusion 22: Concave section 23: Edge 24: Notch 25: Wear-resistant unit 30: Braking assembly 31: deflection part 32: slot 33: long arm 34: short arm 35: inner side 36: cover 37: concave surface 38: convex surface F: applied force P: resistance

FIG. 1 shows the partial structure of the torque wrench of the present invention after being assembled in the preferred embodiment. FIG. 2 shows the partial structure of the torque wrench in a separated state. FIG. 3 shows the movement of the partial structure of the torque wrench from a cross-sectional perspective. FIG. 4 shows the connection relationship of the torque wrench for coaxial rotation. FIG. 5 shows the internal structure of the torque wrench of Taiwan Patent No. I457207.

13: Head

17: Operating parts

18: Assembly room

19: Wall

36: Cover

37: Concave surface

38: Convex surface

Claims (5)

An improved torque wrench comprises: a head (13) forming an assembly chamber (18); and a cover (36) having a plurality of concave surfaces (37) and a plurality of convex surfaces (38) formed alternately on one side; the cover (36) is placed in the assembly chamber (18), each of the concave surfaces (37) reduces the friction area between the wall (19) of the assembly chamber (18) enclosed by the head (13) and the cover (36), and each of the convex surfaces (38) maintains the coaxial rotation relationship between the head (13) and the cover (36). An improved torque wrench as described in claim 1, wherein the head (13) extends to a fitting section (14), the fitting section (14) leading to the assembly chamber (18); a deflection portion (31) protrudes from the other side of the cover (36), and the cover (36) is placed in the assembly chamber (18) in a manner such that the deflection portion (31) faces the fitting section (14). An improved torque wrench as described in claim 2, wherein the fitting section (14) is combined with a tube body (11). An improved torque wrench as described in claim 3, wherein a rod (20) is pivotally connected to the inside of the tube body (11), one end of the rod (20) extends out of the tube body (11), enters the assembly chamber (18) and maintains a mechanical linkage relationship with the deflection portion (31). An improved torque wrench as described in claim 4, wherein the other end of the rod (20) is connected to an adjustment mechanism installed inside the tube (11) and remains stationary.

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