Patent Application
20240159507
This invention has been made by the members of MIMURA Seminar, College of Law, Nihon, Univ. as a team. The present invention relates to a ruler, and more particularly to a ruler having two slidable parts, which is suitable for writing letters in the same straight line without staining hands.
Conventional rulers are used for drawing straight lines and measuring lengths. When writing extremely large letters on plain material, for example, imitation paper, it is difficult to write the letters in a straight horizontal line without using a tool. Furthermore, the ink of the written characters may be adhered to the grounded part of the hand, and the lateral part of the hand from the little finger to the wrist may be stained.
The purpose of this invention is twofold: to solve the above problems to prevent hands from getting dirty when writing letters, and to write letters in a straight horizontal line. The ruler having two slidable parts of the present invention includes a ruler body, which is formed in rectangular shaped, the ruler body having a first recess extending longitudinally on its top surface and a second recess extending longitudinally on its side surface, a hand stand having a wheel, which is coupled with the second recess of the ruler body, and a wrist stand, the wrist stand having a wrist rest portion, a support portion for supporting the wrist rest portion, a joint connecting the wrist rest portion and the support portion, and ground portions attached to the support portion, wherein the ground portions are grounded to the bottom of the first recess.
The invention will be more particularly described with reference to the accompanying drawings, in which:
The preferred embodiment of the invention as a ruler having two slidable parts is explained together with drawings as follows. In each drawing, the same reference numbers designate the same or similar components through all embodiments.
The main body 12, which is formed in a rectangular shape, a first surface 12a and a second surface 12b adjacent to the first surface 12a. A first horizontal recess 21a extending longitudinal direction is formed almost at the center of the first surface 12a, and a second horizontal recess 21b extending longitudinally is formed almost at the center of the second surface 12b. The cross-sectional shape of the first horizontal recess 21a cut at A-A′ will be described later using
As shown in
The second wheel 3 is coupled in the second horizontal recess 21b, and the second wheel 3 rotates therein, so that the hand stand 20 can be moved in longitudinal direction the second surface 12b of the main body 12. The hand stand 20 includes a sponge-like anti-slip 30, which is made of polyurethane foam on its upper surface 20a in order to fit the user's hand shape. The lower part 32 of the hand stand 20 other than the anti-slip 30 is made of plastic material. It is preferable that the total thickness of the hand stand 20 be set to about 2 times the thickness of the anti-slip 30.
As shown in
The main body 12 includes two grooves 14a and 14b in parallel in the longitudinal direction at its bottom in the first recess 21a. Each line of the ground parts 11d are located into one of grooves 14a, 14b, respectively. As described, since ground parts 11d are formed in hemispherical shape, the frictions of the ground parts 11d with the surface of the grooves 14a, 14b are reduced because the contact areas could be reduced.
According to the ruler having two slidable parts 100 of this invention, it is possible the wrist stand 11 is moved along the first horizontal recess 21a. When the user writes a letter using the ruler having two slidable parts 100, the wrist of the user needs to be fixed on the wrist stand 11. Thus, the wrist stand 11 needs to constrain the motion for a little time while writing the letter. On the other hand, to write a letter like “Z”, the user's hand needs to move to the left or right with some extent so the hand rest 20 needs to slide easily. Further, after finishing writing a letter, the arm of the user should be moved to write the next letter. According to the structure of the ruler having two slidable parts 100, the wrist can be held in place by the frictional force between the ground portions 11d and the surface of the grooves 14a, 14b for the period of writing one letter, while the hand of the user can move freely to the left or right. Moreover, the wrist stand 11 can be easily moved by releasing the friction between the ground portions 11d and the surface of the grooves 14a, 14b for the next letter being written.
While the invention has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense. Thus, shapes, size and physical relationship of each component are roughly illustrated so the scope of the invention should not be construed to be limited to them. Further, to clarify the components of the invention, hatching is partially omitted in the cross-sectional views. Moreover, the numerical description in the embodiment described above is one of the preferred examples in the preferred embodiment so that the scope of the invention should not be construed to limit to them.
Various other modifications of the illustrated embodiment will be apparent to those skilled in the art on reference to this description. Therefore, the appended claims are intended to cover any such modifications or embodiments as fall within the true scope of the invention.
