The present invention relates to a hand tool and, in particular, to a hand tool for improving torque, wherein the hand tool has good structural strength to resist breaking and conforms to ergonomics.
In hand tools such as screwdrivers, there are some drawbacks with their conventional products. Major drawbacks are detailed as follows.
A rotating part for rotating the hand tool is assembled to a metal rod. The rotating part protrudes from the metal rod, which means that the largest outside diameter of the rotating part is larger than that of the metal rod. Although such design can increase torque, it also generates a shear force between the rotating part and the metal rod, so breakage tends to occur between the rotating part and the metal rod.
The rotating part is disposed at an end of the metal rod. A distance between a force-applying end (the end of the metal rod) and a force-bearing end (i.e. a head of the metal rod) is too long, so the metal rod needs to be strong enough to resist bending or other structural damage, leading to high production costs. In addition to that, this configuration does not conform to ergonomics. The rotating part disposed at the end of the metal rod hinders users' operations since most users get used to place their palms on a handle and at the end of the metal rod.
In view of this, the inventor studied various technologies and created an effective solution in the present disclosure.
It is an objective of the present invention to provide a hand tool for improving torque, wherein the hand tool has good structural strength to prevent it from being broken and conforms to ergonomics.
Accordingly, the present invention provides a hand tool for improving torque. The hand tool includes a metal rod, a handle and a polygonal portion. The metal rod includes a first head, a first end and an operation section between the first head and the first end. The operation section includes a uniform outside diameter. The handle partially encloses the metal rod and has a second head and a second end. The polygonal portion is formed on the operation section and exposed from the second head of the handle. The polygonal portion has a largest outside diameter, and the largest outside diameter is equal to the uniform outside diameter.
Compared with conventional techniques, the present invention has the following effects. The largest diameter is equal to the uniform diameter, so that the metal rod has superior structural strength and does not break easily. The polygonal portion is exposed from the second head of the handle to allow for ergonomic operations.
The disclosure will become more fully understood from the detailed description and the drawings given herein below for illustration only, and thus does not limit the disclosure, wherein:
Detailed descriptions and technical contents of the present disclosure are illustrated below in conjunction with the accompanying drawings. However, it is to be understood that the descriptions and the accompanying drawings disclosed herein are merely illustrative and exemplary and not intended to limit the scope of the present disclosure.
Referring to
The metal rod 1 is a rod consisting of metal. The metal rod 1 has a first head 11, a first end 12 (see
The handle 2 partially encloses the metal rod 1 and exposes another portion of the metal rod 1. The handle 2 has a second head 21 and a second end 22. By this way, the first end 12 of the metal rod 1 can be disposed inside the handle 2 (see
The polygonal portion 3 is formed on the operation section 13 of the metal rod 1 and is integrally formed (in one-piece form) with the operation section 13 of the metal rod 1. The polygonal portion 3 is partially exposed (see
In detail, the metal rod 1 is divided into two segments, one of the two segments of the metal rod 1 is an internal section enclosed inside the handle 2, the other one of the two segments includes the operation section 13 and the extending section 14 extended from the operation section 13. The operation section 13 is partially enclosed inside the handle 2 with a portion of the polygonal portion 3 (i.e. the operation section 13 is extended into the handle 2 with a portion of the polygonal portion 3), and another portion of the polygonal portion 3 is exposed from the second head 21 of the handle 2.
Since the another portion of the polygonal portion 3 is exposed from the second head 21 of the handle 2, the polygonal portion 3 is at a junction where the second head 21 of the handle 2 joins the metal rod 1. The junction is adjacent to the second head 21 of the handle 2, so it is convenient for a user to operate by his/her both hands. That is to say, the user grips the handle 2 by one hand, and his/her the other hand rotates the polygonal portion 3 with the assistance tool. The metal rod 1 is rotated by rotation of the polygonal portion 3. This ergonomic configuration facilitates rotating the hand tool 100 by hands.
Referring to
In short, in the hand tool 100, the largest outside diameter D2 of the polygonal portion 3 is equal to the uniform outside diameter D1 of the operation section 13, so that no shear force (or less shear force) occurs during rotation of the metal rod 1. Thus, the structural strength is improved to resist breaking. Besides, the polygonal portion 3 is exposed from the second head 21 of the handle, thereby facilitating ergonomic operations.
The polygonal portion 3 preferably includes an insertion hole 31. The insertion hole 31 is formed on the portion of the polygonal portion exposed from the second head 21. The insertion hole 31 can be a through hole shown in the drawing or a blind hole (not illustrated); the present invention is not limited in this regard. The insertion hole 31 is formed along a radial direction, and the radial direction is perpendicular to the axial direction mentioned above; however, the present invention is not limited to the radially formed insertion hole 31, and the insertion hole 31 can be formed along any direction which intersects the axial direction.
Referring to
Referring to
When the hand tool 100 is a screwdriver with interchangeable tool heads, the first head 11 of the metal rod 1 is a driving sleeve (not labelled). A tool head (an I-shaped or cross-shaped screwdriver tip) can be selectively coupled into the driving sleeve.
In summary, the hand tool for improving torque can achieve anticipated objectives and solve the conventional defects. The present invention also has novelty and non-obviousness, so the present invention completely complies with the requirements of patentability. Therefore, a request to patent the present invention is filed pursuant to patent law. Examination is kindly requested, and allowance of the present application is solicited to protect the rights of the inventor.
It is to be understood that the above descriptions are merely the preferable embodiments of the present invention and are not intended to limit the scope of the present invention. Equivalent changes and modifications made in the spirit of the present invention are regarded as falling within the scope of the present invention.