Abstract:
An improved structure art design knife comprised of a front cover, a rear cover, an upper support cushion, a lower support cushion, a blade magazine section, and a blade arrestor section. In addition to providing for convenient blade replacement, the blade magazine section contains a quantity of spare blades to thereby increase art design knife efficiency and, furthermore, enhance the industrial practical value of art design knife structures.

Description:
BACKGROUND OF THE INVENTION 
     1) Field of the Invention 
     The invention herein relates to an improved structure art design knife providing for the safer and firmer manual wielding of an art design knife that is comprised of a front cover, a rear cover, an upper support cushion, a lower support cushion, a blade magazine section, and a blade arrestor section; in addition to providing for convenient blade replacement, the magazine section of the present invention contains a quantity of spare blades to thereby increase art design knife efficiency and, furthermore, enhance the industrial practical value of art design knife structures. 
     2) Description of the Prior Art 
     Conventional art design knives typically have internally disposed extension/retraction devices, wherein the wear that normally occurs between a keeper spring and a single-sided wave-contoured engagement slot diminishes stationary nesting capability, which during utilization results in the incapability of maintaining the fixed positioning of the blade and easily causes dangerous wounds. Furthermore, since the spare blades of conventional art design knives are kept external from the body of the implement itself, when a blade is to be replaced, a considerable amount of time is often wasted locating the spare blades. In view of the existent shortcomings of the conventional product still awaiting improvement, the inventor of the invention herein based on specialized knowledge and design experience gained by engagement in the related fields conducted extensive research inspired by an original idea that culminated in the successful design of the improved structure art design knife of the present invention. 
     SUMMARY OF THE INVENTION 
     The objective of the invention herein is to provide an improved structure art design knife in which the push button, the blade changing key, and the blade mount are solidly, efficiently, and precisely engaged in the wave-contoured stepped slot of the front cover, effectively reinforcing the immovability of the blade and thereby increasing its safety; furthermore, the blade magazine section of the invention herein contains a quantity of spare blades and is physically integrated with the body of the art design knife to further facilitate blade replacement convenience. 
     To enable the examination committee to further understand the advantages, objectives, and functions of the present invention, the preferred embodiments of the invention herein accompanied by the brief description of the drawings below and followed by the detailed description of the invention herein. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an isometric drawing of the invention herein. 
     FIG. 2 is an exploded drawing of the invention herein. 
     FIG. 3 is an isometric drawing of the push button  62  of the invention herein. 
     FIG. 4 is an isometric drawing of the push button  62  of the invention herein. 
     FIG. 5 is an isometric drawing of the blade changing key  63  of the invention herein. 
     FIG. 6 is an isometric drawing of the blade changing key  63  of the invention herein. 
     FIG. 7 is an isometric drawing of the blade mount  61  of the invention herein. 
     FIG. 8 is an isometric drawing of the blade mount  61  of the invention herein. 
     FIG. 9 is an orthographic drawing of the invention herein that shows the interior side of the front cover  1 . 
     FIG. 10 is an exploded drawing of the blade arrestor section  6 . 
     FIG. 11 is an exploded drawing of the blade magazine section  5  of the invention herein. 
     FIG. 12 is an orthographic drawing of the invention herein that illustrates the extension and retraction of the blade. 
     FIG. 13 is an orthographic drawing of the invention herein that illustrates the extension and retraction of the blade. 
     FIG. 14 is an orthographic drawing of the invention herein that illustrates the withdrawal of the blade during replacement. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to FIG.  1  and FIG. 2, the improved structure art design knife of the invention herein is comprised of a front cover  1 , a rear cover  2 , an upper support cushion  3 , a lower support cushion  4 , a blade magazine section  5 , and a blade arrestor section  6 , of which: 
     The front cover  1 , as indicated in FIG. 9, the said front cover  1  is a casing of one-piece construction, the front cover  1  having, an elongated opening  11  formed along the rear section of its top edge as well as an elongated opening  12  along the rear section of its bottom section, and the front cover  1  also has a trapezoid-shaped opening  13  formed in the side of its rear section; furthermore, a hole  14  is formed through the tail end of the front cover  1 , a wave-contoured stepped slot  15  is disposed inside the upper anterior section of the said front cover  1  and, furthermore, a threaded hole  16  is formed at the center of the front cover  1 . 
     The rear cover  2  is a casing of one-piece construction, the rear cover  2  having an elongated opening  21  formed along the rear section of its top edge as well as an elongated opening  22  along the rear section of its bottom section, and the rear cover  2  also has a round opening  23  formed in the side of its rear section; furthermore, a hole  24  is formed through the tail end of the rear cover  2  and, furthermore, a threaded hole  25  is formed at the center of the rear cover  2 . 
     The upper support cushion  3  is unitarily constructed of a soft plastic material that further increases both wielding comfort and stability. 
     The lower support cushion  4  is also unitarily constructed of a soft plastic material that further increases both wielding comfort and stability. 
     The blade magazine section  5 , as indicated in FIG. 11, consists of a blade magazine front cover plate  51 , a blade magazine frame  52 , and a blade magazine bottom cover plate  53 , wherein: 
     The blade magazine front cover plate  51  has projecting from the center of its outer side a cylindrical nub  511 ; the said blade magazine front cover plate  51  has an arc-shaped indentation  512  formed in one side and a protruding block  513  at the center and inner lateral aspect of its other side. 
     The blade magazine frame  52  is of a trapezoidal hollow arrangement having at its center a holding chamber  521  for containing a quantity of spare blades and the said blade magazine frame  52  has slots  522  formed in the upper and lower edges of its front side. 
     The blade magazine bottom cover plate  53  is of a trapezoidal planar arrangement having formed at both the upper and lower aspects of one side four hook tabs  531  and, furthermore, situated at the center of the same side is an L-shaped stay  532 , the said stay  532  retaining an inserted V-shaped spring  54 . 
     The blade magazine front cover plate  51  is inserted into the slots  522  formed in the upper and lower edges at the front side of the blade magazine frame  52 , a quantity of spare blades (not shown in the drawings) are placed into the rear side of the blade magazine frame  52 , and the blade magazine bottom cover plate  53 , by means of its four hook tabs  531 , is fitted over the rear side of the blade magazine frame  52  to assemble the blade magazine section  5 ; the spring  54  on the said blade magazine bottom cover plate  53  forces the quantity of spare blades tightly against the blade magazine front cover plate  51  such that when the user pushes the cylindrical nub  511  at the outer side and center of the blade magazine front cover plate  51  in the direction of the arc-shaped indentation  512 , the protruding block  513  of the blade magazine front cover plate  51  ejects the spare blade closest to the blade magazine front cover plate  51  out of the blade magazine section  5 , thereby providing for the dispensing of spare blades. 
     The blade arrestor section  6  consists of a blade mount  61 , a push button  62 , and a blade changing key  63 , wherein: 
     The push button  62 , as indicated in FIG.  3  and FIG. 4, has a columnar post  622  at the center of one side of its push button body  621  as well as a columnar post  623  formed at the lower lateral extent of its front edge and, furthermore, a pair of hooked clips  624  is disposed at the lower extent of the push button  62 . 
     The blade changing key  63 , as indicated in FIG.  5  and FIG. 6, has semicircular lock tabs  631  at the front end and bottom edge of one side; a columnar post  632  projects from the center of the upper edge of the said blade changing key  63 , a support shaft  633  projects from the tail end of one side on the blade changing key  63  and, furthermore, a columnar post  634  is disposed at the front end and bottom edge on the other side of the blade changing key  63 . 
     The blade mount  61 , as indicated in FIG.  7  and FIG. 8, has a T-shaped insertion element  611  at the upper edge of its front end and another insertion element  612  at its lower edge; a rectangular opening  613  is formed in the center of the said blade mount  61  and, furthermore, a semicircular support shaft hole  614  is formed in the upper edge at the tail end of the said blade mount  61 . 
     Referring to FIG. 10, the said blade arrestor section  6  consists of the support shaft  633  at the tail end of one side on the blade changing key  63  fitted into the semicircular support shaft hole  614  formed in the upper edge at the tail end of the said blade mount  61 , the columnar post  623  of the said push button  62  is conjoined to the columnar post  632  projecting from the center of the said blade changing key  63  by means of a coil spring  64  ensleeved in between them and, furthermore, the hooked clips  624  disposed at the lower extent of the said push button  62  are slipped into a coil spring  65  and then inserted into the rectangular opening  613  of the said blade mount  61  where they are fixed into position; semicircular engagement notches  81  along the top edge of the blade  8  ensconce the lock tabs  631  at the front end and bottom edge of one side of the blade changing key  631 , thereby completing the assembly of the blade arrestor section  6 . 
     In the blade arrestor section  6  of the invention herein, the columnar post  622  at one side of the push button body  621  is inserted and fixed into the wave-contoured stepped slot  15  disposed inside the upper anterior section of the said front cover  1 , the said release button  7  is secured against the upper edge at the front section of the front cover  1 , the said upper support cushion  3  is fitted into the elongated opening  11  formed along the rear section of the top edge of the front cover  1 , and the said lower support cushion  4  is fitted into the elongated opening  12  along the rear portion of the bottom section of the front cover  1 ; the rear cover  2  and the front cover  3  are then brought together, a screw  9  is inserted into the threaded hole  25  of the rear cover  2  and fastened into the threaded hole  16  of the front cover  1 ; and the said blade magazine section  5  is fitted into the trapezoid-shaped opening  13  in the front cover  1  to complete the entire assembly of the art design knife structure. 
     EMBODIMENTS OF THE INVENTION 
     As indicated in FIG. 12, the columnar post  622  of the push button  62  in the invention herein is engaged in the wave-contoured stepped slot  15  and when the push button  62  is pressed downward, its columnar post  622  is disengaged from the wave-contoured stepped slot  15  and the push button  62  is driven outward, enabling the push button  62  to slide out the blade mount  61 , the blade changing key  63 , and the blade  8 ; the press button  62  is released when the blade  8  has been moved to the appropriate position, at which time the tension of the coil springs  64  and  65  shoves the push button  62  upward and the columnar post  622  becomes again engaged in the wave-contoured stepped slot  15 , thereby achieving safe and stable blade operation, as indicated in FIG. 13; to fully retract the blade  8 , the push button  62  is operated according to the reverse sequence of the above procedure. 
     To replace a blade, referring to FIG. 14, when the blade  8  has been pushed outside the body of the art design knife, the blade changing key  63  is pressed down and with the support shaft  633  of the said blade changing key  63  serving as an axis of sway, the lock tabs  631  at the front end of the blade changing key  63  are extricated from the engagement notches  81  of the blade  8 , allowing the removal of the blade  8  and the placement of a new blade into the body of the art design knife; the blade changing key  63  is then released and the tension of the coil spring  64  is sufficient enough to secure the lock tabs  631  of the blade changing key  63  back into the engagement notches  81  of the blade  8 , which completes the blade replacement operation. 
     In summation of the foregoing section, since the present invention is capable of achieving its claimed objectives and, furthermore, the disclosed structure possesses exceptional practical value and functions, the invention herein is submitted to the examination committee for review and the granting of the commensurate patent rights.