Pen wielding resistance exerciser

Abstract

The invention relates to the technical field of pen wielding auxiliary tools, in particular to a pen wielding resistance trainer. The device comprises a positioning plate and a fixing cylinder assembled above the positioning plate, and an anti-resistance mechanism is assembled on the inner side of the fixing cylinder. Through the structural design of the anti-resistance mechanism and the direction adjusting mechanism, the direction can be changed, anti-resistance training can be conducted on strokes in different directions, autonomous power generation and explosive power of hands can be exercised, a practicer can form muscle memory for power generation in each direction and master stroke power generation skills, the purpose of fast and good writing is achieved, and the practical value of the practicer is improved. Through the structural design of an auxiliary limiting mechanism, the device can adjust the direction of a fixed cylinder, so that a main arrow on the fixed cylinder can correspond to a first direction indicating arrow, a user can conveniently carry out decomposition resistance exercise on horizontal, vertical, left-falling and right-falling point lifting hooks, and meanwhile, the device is small and flexible in size and convenient to use. And the pen wielding force of the hand can be exercised through multi-direction and multi-angle adjustment, so that the writing becomes easier.

Description

Technical Field

[0001] The invention relates to the technical field of pen-movement auxiliary tools, and in particular to a pen-movement resistance trainer. Background Art

[0002] Chinese characters constitute a unique symbol system of Chinese culture and Chinese language. They are not only a medium for all Chinese speakers to communicate their emotions and express their thoughts, but also each of their strokes contains unique charm and aesthetic value, showing endless aesthetic charm. Among many countries in the world, only China's cultural bloodline has continued from ancient times to the present without interruption. Similarly, our "Chinese characters" are also a unique form of writing in the world. It has come all the way from ancient times and has undergone evolution, but it has never stopped its development and maintained a continuous inheritance.

[0003] Writing Chinese characters has always been an important and indispensable learning content in primary and even secondary education in my country. For students who are learning to write Chinese characters, it is very important to master the correct writing posture and the skills of controlling pen strokes. In the process of learning to write Chinese characters, it is necessary to understand the structure of Chinese characters, the correct pen-holding posture, and the force-generating skills of strokes. Mastering the force-generating skills can help practitioners write beautiful and sharp strokes, making writing good, fast and easy. In view of this, a series of auxiliary tools designed for Chinese character writing practice have emerged in the current technical field, such as watermark copybooks, writing templates, etc. However, the existing technology is limited to practicing the writing of characters, and it is not convenient for students to practice the pen control and pen strength, and the purpose of exercising the autonomous force and explosive power of the hands cannot be achieved. For this reason, we propose a pen resistance trainer. Summary of the invention

[0004] The purpose of the present invention is to provide a pen movement resistance trainer to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A pen movement resistance exerciser comprises a positioning plate and a fixed cylinder mounted above the positioning plate, wherein an resistance mechanism is mounted on the inner side of the fixed cylinder, and the resistance mechanism is used to assist the user in pen movement practice when holding the pen body, and the resistance mechanism comprises a matching cavity, an anti-slip disk, a movable rod, a first connecting spring and a connecting assembly, wherein a matching cavity is provided on the inner side of the fixed cylinder, and an anti-slip disk is slidably connected to the inner side of the matching cavity, and a movable rod is slidably connected to one end of the fixed cylinder, and one end of the movable rod is fixed to the anti-slip disk, and a connecting assembly is mounted on the other end of the movable rod, and a first connecting spring is sleeved on the outer side of the movable rod, and the first connecting spring is clearance-matched with the matching cavity.

[0007] Preferably, the connecting assembly includes a docking joint, a sleeve and a plug-in slot, the end of the movable rod away from the anti-detachment disk is fixed with a docking joint, one end of the docking joint is equipped with a sleeve, one end of the sleeve is provided with a plug-in slot, and the inner side of the plug-in slot is transitionally matched with the pen body.

[0008] Preferably, the connecting assembly also includes a first connecting hinge seat and a second connecting hinge seat, and the end of the docking joint away from the movable rod is rotatably connected to the first connecting hinge seat through a pin, and the end of the first connecting hinge seat away from the docking joint is rotatably connected to the second connecting hinge seat through a pin, and the second connecting hinge seat is fixed to the sleeve.

[0009] Preferably, a mounting groove is formed at one end of the fixed tube away from the movable rod, the mounting groove is slidably connected to the anti-dropping disc, a limiting cap is assembled on the inner side of the mounting groove, and the limiting cap is interference fit with the inner side of the mounting groove.

[0010] Preferably, an orientation adjustment mechanism is installed between the positioning plate and the fixing tube, and the orientation adjustment mechanism is used to adjust the orientation of the fixing tube.

[0011] Preferably, the azimuth adjustment mechanism includes a first circular groove, a central axis, a rotating wheel disc, a toothed disc and a second circular groove. A first circular groove is provided at the top of the positioning plate and close to the fixed cylinder. A central axis is fixed to the bottom of the inner side of the first circular groove. A rotating wheel disc is rotatably connected to the inner side of the first circular groove. The rotating wheel disc is fixed to the fixed cylinder. A toothed disc is fixed to the bottom of the rotating wheel disc. The toothed disc is rotatably connected to the central axis. A second circular groove is provided on the inner side of the first circular groove. The second circular groove and the toothed disc are clearance-matched.

[0012] Preferably, an auxiliary limiting mechanism is installed on the inner side of the second circular groove, and the auxiliary limiting mechanism is used for auxiliary limiting the toothed disc.

[0013] Preferably, the auxiliary limiting mechanism includes a strip rod, a pressure block, a second connecting spring and limiting teeth, a strip rod is fixed on the inner side of the second circular groove, a sliding groove is provided at one end of the strip rod, a second connecting spring is fixed at one end of the inner side of the sliding groove, a pressure block is fixed at one end of the second connecting spring, the pressure block is slidably connected to the sliding groove, a limiting tooth is fixed at one end of the pressure block away from the second connecting spring, an arc surface is provided on the end face of the limiting tooth away from the pressure block, and the limiting tooth is meshingly connected to the toothed disc.

[0014] Preferably, a plurality of first direction indicating arrows are evenly fixed on the top of the positioning plate and around the outer side of the rotating wheel disc, a movable plate is rotatably connected at the center of the top of the rotating wheel disc, there is a gap between the movable plate and the fixed cylinder, and second direction indicating arrows are fixed at both ends of the movable plate.

[0015] It can be seen without a doubt that the above-mentioned technical solution of the present application can definitely solve the technical problem to be solved by the present application.

[0016] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects:

[0017] 1. The structural design of the resistance mechanism and the orientation adjustment mechanism of the present invention enables the device to perform resistance training on strokes in different directions by changing the direction, so as to exercise the autonomous force and explosive power of the hands. By performing decomposition exercises on the horizontal, vertical, left-falling, right-falling, dot, hook and lift strokes, the practitioner can form muscle memory for the force in each direction, master the stroke force skills, and achieve the purpose of writing quickly and well. After the resistance training, the practitioner can become at ease when actually writing.

[0018] 2. The present invention uses the structural design of the auxiliary limiting mechanism to enable the device to adjust the orientation of the fixed tube so that the main arrow on the fixed tube can correspond to the first direction indication arrow, which is convenient for users to assist in practicing horizontal and vertical strokes. At the same time, the present invention is small and flexible in size and can be adjusted in multiple directions and angles to exercise hand pen movement and make writing easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the explosion structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the cross-section structure of the fixing cylinder of the present invention;

[0023] Figure 4 It is a schematic diagram of the cross-section structure of the positioning plate of the present invention;

[0024] Figure 5 It is a schematic diagram of the cross-section structure of the positioning plate and the strip rod of the present invention.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] In the figure: 1. positioning plate; 2. pen body; 3. fixing cylinder; 4. matching cavity; 5. anti-slip disk; 6. movable rod; 7. first connecting spring; 8. docking head; 9. first connecting hinge seat; 10. second connecting hinge seat; 11. sleeve; 12. plug-in slot; 13. installation slot; 14. limiting cap; 15. first circular slot; 16. central axis; 17. rotating wheel; 18. toothed disc; 19. second circular slot; 20. strip rod; 21. pressure block; 22. second connecting spring; 23. limiting teeth; 24. first direction indication arrow; 25. movable sheet; 26. second direction indication arrow. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] Example 1

[0029] Reference Figure 1-4 A pen movement resistance exerciser comprises a positioning plate 1, and a fixed cylinder 3 assembled above the positioning plate 1, an anti-resistance mechanism is assembled on the inner side of the fixed cylinder 3, and the anti-resistance mechanism is used to assist the user to hold the pen body 2 to practice pen movement, and the anti-resistance mechanism comprises a matching cavity 4, an anti-slip disk 5, a movable rod 6, a first connecting spring 7 and a connecting assembly, a matching cavity 4 is opened on the inner side of the fixed cylinder 3, and the anti-slip disk 5 is slidably connected to the inner side of the matching cavity 4, and the movable rod 6 is slidably connected to one end of the fixed cylinder 3, and one end of the movable rod 6 is fixed to the anti-slip disk 5, and the other end of the movable rod 6 is assembled with a connecting assembly, and the first connecting spring 7 is sleeved on the outer side of the movable rod 6, and the first connecting spring 7 is clearance-matched with the matching cavity 4.

[0030] The connecting assembly includes a docking joint 8, a sleeve 11 and an insertion groove 12. The docking joint 8 is fixed to the end of the movable rod 6 away from the anti-detachment disk 5. The sleeve 11 is assembled at one end of the docking joint 8. The insertion groove 12 is opened at one end of the sleeve 11. The inner side of the insertion groove 12 is transitionally matched with the pen body 2. A rubber ball-shaped protrusion is provided on the inner side of the insertion groove 12 to increase the friction between the insertion groove 12 and the pen body 2.

[0031] The connecting assembly also includes a first connecting hinge seat 9 and a second connecting hinge seat 10. The end of the docking joint 8 away from the movable rod 6 is rotatably connected to the first connecting hinge seat 9 through a pin, and the end of the first connecting hinge seat 9 away from the docking joint 8 is rotatably connected to the second connecting hinge seat 10 through a pin. The second connecting hinge seat 10 is fixed to the sleeve 11. When in use, the setting of the first connecting hinge seat 9 and the second connecting hinge seat 10 can increase the movable angle range of the sleeve 11, so that the transmission of the force generated by holding the pen is smoother.

[0032] An installation groove 13 is provided at one end of the fixed tube 3 away from the movable rod 6, and the installation groove 13 is slidably connected to the anti-slip disk 5. A limiting cap 14 is assembled on the inner side of the installation groove 13, and the limiting cap 14 is interference fit with the inner side of the installation groove 13. The arrangement of the installation groove 13 and the limiting cap 14 facilitates the assembly of the internal components of the fixed tube 3 at a later stage.

[0033] An orientation adjustment mechanism is installed between the positioning plate 1 and the fixing tube 3 , and the orientation adjustment mechanism is used to adjust the orientation of the fixing tube 3 .

[0034] The azimuth adjustment mechanism includes a first circular groove 15, a central axis 16, a rotating wheel disc 17, a toothed disc 18 and a second circular groove 19. The first circular groove 15 is provided at the top of the positioning plate 1 and close to the fixed cylinder 3. The central axis 16 is fixed to the bottom of the inner side of the first circular groove 15. The inner side of the first circular groove 15 is rotatably connected with a rotating wheel disc 17, which is fixed to the fixed cylinder 3. A toothed disc 18 is fixed to the bottom of the rotating wheel disc 17, which is rotatably connected to the central axis 16. A second circular groove 19 is provided on the inner side of the first circular groove 15, and the second circular groove 19 is clearance-matched with the toothed disc 18. When the rotating wheel disc 17 is rotated, the central axis 16 can provide rotation support and guidance for the toothed disc 18.

[0035] A plurality of first direction indicating arrows 24 are evenly fixed on the top of the positioning plate 1 and around the outer side of the rotating wheel 17. A movable piece 25 is rotatably connected to the center of the top of the rotating wheel 17. There is a gap between the movable piece 25 and the fixed cylinder 3, so that when the movable piece 25 is rotated, the fixed cylinder 3 will not cause motion interference to the movable piece 25. Second direction indicating arrows 26 are fixed at both ends of the movable piece 25. A main arrow is arranged on the top of the fixed cylinder 3. At the same time, the arrangement of the first direction indicating arrow 24 facilitates the function of pen pointing.

[0036] Example 2

[0037] Embodiment 1 is further optimized, specifically, as Figure 4-5 As shown, an auxiliary limiting mechanism is installed on the inner side of the second circular groove 19 , and the auxiliary limiting mechanism is used to perform auxiliary limiting on the toothed disc 18 .

[0038] The auxiliary limiting mechanism includes a strip rod 20, a pressure block 21, a second connecting spring 22 and a limiting tooth 23. The strip rod 20 is fixed on the inner side of the second circular groove 19, and a sliding groove is provided at one end of the strip rod 20. The second connecting spring 22 is fixed at one end of the inner side of the sliding groove. The pressure block 21 is fixed at one end of the second connecting spring 22. The pressure block 21 is slidably connected with the sliding groove. The limiting tooth 23 is fixed at one end of the pressure block 21 away from the second connecting spring 22. The end surface of the limiting tooth 23 away from the pressure block 21 is provided with an arc surface, and the limiting tooth 23 is meshed and connected with the toothed disc 18. During use, when the angle of the fixed cylinder 3 needs to be adjusted, the fixed cylinder 3 is rotated. At the same time, because the toothed disc 18 is meshed and connected with the limiting tooth 23, and the end surface of the limiting tooth 23 away from the pressure block 21 is provided with an arc surface, the tooth block on the toothed disc 18 is guided by the arc surface, so that the tooth block pushes the limiting tooth through the arc surface. The teeth 23 move, so that the limiting teeth 23 push the pressure block 21 to move along the inner side of the sliding groove, thereby causing the second connecting spring 22 to be squeezed and contracted. Through the rotation of the toothed disc 18, the tooth blocks on the toothed disc 18 continuously form a limit for the limiting teeth 23, so that the limiting teeth 23 are temporarily contracted into the sliding groove. When it is rotated to the specified orientation, the rotation of the fixed cylinder 3 is stopped. At this time, the second connecting spring 22 drives the pressure block 21 and the limiting teeth 23 to reset and rebound, so that the limiting teeth 23 are meshed and connected with the toothed disc 18 again to achieve the adjustment of the angle of the fixed cylinder 3; at the same time, it can be understood that only when the fixed cylinder 3 is rotated by an external force can the rotating wheel 17 be rotated; at the same time, it can be understood that in the actual use process, by selecting toothed discs 18 with different tooth block numbers and specifications to adapt to the adjustment of different azimuth angle ranges, the phenomenon of teeth of the toothed disc 18 and the limiting teeth 23 being relative to each other can be avoided.

[0039] From the above, we can know that:

[0040] The present invention is aimed at the following technical problems: A series of auxiliary tools designed for Chinese character writing practice have emerged in the current technical field, such as watermark copybooks, writing templates, etc. However, the existing technology is limited to practicing the writing of characters, and it is not convenient for students to practice the pen control and pen movement strength, and the purpose of exercising the hands' autonomous strength and explosive power cannot be achieved; the technical solutions of the above embodiments are adopted. At the same time, the implementation process of the above technical solutions is:

[0041] During use, the tip of the pen body 2 is inserted into the insertion slot 12, and then the user holds the pen body 2 to write. When the user holds the pen body 2 and exerts force, the sleeve 11 pulls the second connecting hinge seat 10 and the first connecting hinge seat 9, so that the first connecting hinge seat 9 pulls the docking head 8 and the movable rod 6 to move. Because the movable rod 6 is slidably connected to the fixed cylinder 3, the anti-detachment disk 5 is slidably connected to the matching cavity 4, and the first connecting spring 7 is sleeved on the outside of the movable rod 6, the movable rod 6 can pull the anti-detachment disk 5 to move along the inside of the matching cavity 4, so that the first connecting spring 7 is sleeved on the outside of the movable rod 6. A connecting spring 7 is squeezed and contracted by the anti-slip disk 5. After the user completes a writing action, the pen body 2 is relieved of force, and the hand movement changes adaptively with the pen body 2, so that the elastic force generated by the first connecting spring 7 pushes the anti-slip disk 5 to reset. Then the user holds the pen body 2 again to exert force, and repeats this process. By adjusting the azimuth angle of the fixed tube 3, resistance training is performed on strokes in different aspects, and the autonomous force and explosive power of the hand are trained, so that the practitioner can form muscle memory for the force in each direction, master the force of the strokes, and achieve the purpose of pen force training.

[0042] Through the above configuration, the present application can certainly solve the above technical problems and achieve the following technical effects:

[0043] 1. The structural design of the resistance mechanism and the orientation adjustment mechanism of the present invention enables the device to perform resistance training on strokes in different directions by changing the direction, so as to exercise the autonomous force and explosive power of the hands. By performing decomposition exercises on the horizontal, vertical, left-falling, right-falling, dot, hook and lift strokes, the practitioner can form muscle memory for the force in each direction, master the stroke force skills, and achieve the purpose of writing quickly and well. After the resistance training, the practitioner can become at ease when actually writing.

[0044] 2. The present invention uses the structural design of the auxiliary limiting mechanism to enable the device to adjust the orientation of the fixed tube 3 so that the main arrow on the fixed tube 3 can correspond to the first direction indicating arrow 24, which is convenient for users to perform auxiliary practice on horizontal and vertical strokes. At the same time, the present invention is small and flexible in size and can be adjusted in multiple directions and angles to exercise the hand's pen power, making writing easier.

[0045] The inventor of the present invention is a calligraphy enthusiast. During long-term writing practice and writing education for his children, nephews and nieces, he found that force is very important for writing. Therefore, after many improvements, the inventor implemented the present invention to better train the action of pen movement and force in the process of writing practice, so as to help learners master the force of each stroke in each direction more quickly, achieve twice the result with half the effort, and allow learners to write faster and better in the actual writing process.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A pen movement resistance training device, characterized in that: The invention comprises a positioning plate (1) and a fixed cylinder (3) mounted on the positioning plate (1). The inner side of the fixed cylinder (3) is equipped with an anti-resistance mechanism, and the anti-resistance mechanism is used to assist the user in holding the pen body (2) to practice writing. The anti-resistance mechanism comprises a matching cavity (4), an anti-slip disk (5), a movable rod (6), a first connecting spring (7) and a connecting assembly. The inner side of the fixed cylinder (3) is provided with a matching cavity (4), and the inner side of the matching cavity (4) is slidably connected with the anti-slip disk (5). One end of the fixed cylinder (3) is slidably connected with the movable rod (6), one end of the movable rod (6) is fixed to the anti-slip disk (5), and the other end of the movable rod (6) is equipped with a connecting assembly. The outer side of the movable rod (6) is sleeved with a first connecting spring (7), and the first connecting spring (7) is clearance-matched with the matching cavity (4).

2. A pen movement resistance training device according to claim 1, characterized in that: The connecting assembly comprises a docking joint (8), a sleeve (11) and an inserting groove (12); the docking joint (8) is fixed to one end of the movable rod (6) away from the anti-slip disk (5); one end of the docking joint (8) is equipped with a sleeve (11); one end of the sleeve (11) is provided with an inserting groove (12); the inner side of the inserting groove (12) is transitionally matched with the pen body (2).

3. The pen movement resistance training device according to claim 2, characterized in that: The connecting assembly also includes a first connecting hinge seat (9) and a second connecting hinge seat (10); the end of the docking joint (8) away from the movable rod (6) is rotatably connected to the first connecting hinge seat (9) via a pin; the end of the first connecting hinge seat (9) away from the docking joint (8) is rotatably connected to the second connecting hinge seat (10) via a pin; and the second connecting hinge seat (10) is fixed to the sleeve (11).

4. The pen movement resistance training device according to claim 1, characterized in that: A mounting groove (13) is formed at one end of the fixed tube (3) away from the movable rod (6), the mounting groove (13) is slidably connected to the anti-slip disc (5), a limiting cap (14) is mounted on the inner side of the mounting groove (13), and the limiting cap (14) is interference fit with the inner side of the mounting groove (13).

5. The pen movement resistance training device according to claim 1, characterized in that: An orientation adjustment mechanism is installed between the positioning plate (1) and the fixing cylinder (3), and the orientation adjustment mechanism is used to adjust the orientation of the fixing cylinder (3).

6. The pen movement resistance training device according to claim 5, characterized in that: The azimuth adjustment mechanism comprises a first circular groove (15), a central shaft (16), a rotating wheel disc (17), a toothed disc (18) and a second circular groove (19); the first circular groove (15) is provided at the top of the positioning plate (1) and close to the fixed cylinder (3); the central shaft (16) is fixed to the bottom of the inner side of the first circular groove (15); the inner side of the first circular groove (15) is rotatably connected with a rotating wheel disc (17); the rotating wheel disc (17) is fixed to the fixed cylinder (3); the bottom of the rotating wheel disc (17) is fixed with a toothed disc (18); the toothed disc (18) is rotatably connected to the central shaft (16); the inner side of the first circular groove (15) is provided with a second circular groove (19); the second circular groove (19) and the toothed disc (18) are clearance-matched.

7. The pen movement resistance training device according to claim 6, characterized in that: An auxiliary limiting mechanism is installed on the inner side of the second circular groove (19), and the auxiliary limiting mechanism is used to perform auxiliary limiting on the toothed disc (18).

8. The pen movement resistance training device according to claim 7, characterized in that: The auxiliary limiting mechanism comprises a strip rod (20), a pressure block (21), a second connecting spring (22) and a limiting tooth (23); the strip rod (20) is fixed on the inner side of the second circular groove (19); one end of the strip rod (20) is provided with a sliding groove; one end of the inner side of the sliding groove is fixed with a second connecting spring (22); one end of the second connecting spring (22) is fixed with a pressure block (21); the pressure block (21) is slidably connected to the sliding groove; the limiting tooth (23) is fixed on the end of the pressure block (21) away from the second connecting spring (22); the end surface of the limiting tooth (23) away from the pressure block (21) is provided with an arc surface; the limiting tooth (23) is meshedly connected with the toothed disc (18).

9. The pen movement resistance training device according to claim 6, characterized in that: A plurality of first direction indicating arrows (24) are evenly distributed and fixed on the top of the positioning plate (1) and around the outer side of the rotating wheel (17); a movable sheet (25) is rotatably connected to the center of the top of the rotating wheel (17); a gap exists between the movable sheet (25) and the fixed cylinder (3); and second direction indicating arrows (26) are fixed to both ends of the movable sheet (25).

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