CROSS-REFERENCE TO RELATED APPLICATIONS 
   Not Applicable 
   STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
   Not Applicable 
   REFERENCE TO SEQUENCE LISTING, A TABLE, OR A COMPUTER PROGRAM LISTING COMPACT DISK APPENDIX 
   Not Applicable 
   BACKGROUND OF THE INVENTION 
   Knife blocks for storing cutlery typically consist of a solid block of material with a number of parallel slots that hold the knife blades. The handles stick up, which leaves the knives exposed for small children to grab and potentially hurt themselves. This invention is a knife block that can be locked to safeguard knives and other sharp objects (e.g., kitchen shears) from small children. In addition, this invention uses a locking mechanism that does not require any alterations to the knives, a drawback of other lockable knife blocks. Finally, this knife block has few parts, which makes it easy to manufacture. 
   BRIEF SUMMARY OF THE INVENTION 
   This invention is a knife block that can be locked to safeguard knives and other sharp objects (e.g., kitchen shears). In the unlocked position, a cap with holes in the top fits down snugly on the block base. In this position, the holes in the cap are aligned with the knife handles such that they protrude through the cap and the knives are available for use. To lock the knife block, the user raises the cap above the knife handles and rotates it, confining the knives within the cap and rendering them inaccessible because of the changed orientation of the holes in the cap, i.e., perpendicular to the knife handles. Depressible catch pieces lock the cap in place. To unlock it, the user depresses the catch pieces and rotates and lowers the cap. 


   
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
       FIG. 1  is a perspective view of the base. 
       FIG. 2  is a perspective view of the cap piece. 
       FIG. 3  is a perspective view of this lockable knife block in the unlocked position with cap down snugly over the base and a knife handle sticking out through a hole in the cap. 
       FIG. 4  is a perspective view of this lockable knife block in the locked position with the cap up, confining the cutlery. 
       FIG. 5  is a side elevation of FIG.  4 . 
       FIG. 6  is a side elevation of FIG.  1 . 
       FIG. 7A  is an elevation of the top of the cap piece in the locked position and is indicated by the I—I line in FIG.  5 . 
       FIG. 7B  is similar to  FIG. 7A  but shows the cap piece and base in the unlocked position. 
       FIG. 8A  is a cross section through the base and cap when the knife block assembly is in the locked position and is indicated by the II—II line in FIG.  6 . 
       FIG. 8B  is similar to  FIG. 8A  but the catch piece is depressed so it does not block the movement of the cap, which is rotating toward the unlocked position. 
       FIG. 8C  is similar to  FIG. 8A  but the knife block assembly is in the unlocked position. 
       FIG. 8D  is similar to  FIG. 8A  but the cap piece is rotating toward the locked position and has partially depressed the catch piece. 
   


   DETAILED DESCRIPTION OF THE INVENTION 
   Referring to  FIG. 1 , the base  1  of the knife block is made of pressed wood or a plastics polymer. The base  1  has slots  8  for the knives&#39; blades like most knife blocks. The upper part of the base  1  is cylindrical. A “foot”  5  projects from the front of the base  1  for stability. On the sides of the base  1  are three narrow grooves  3  oriented close to the vertical, which will be referred to as “vertical grooves”. Only one of the vertical grooves  3  is visible in FIG.  1 . Also on the sides of the base  1  are three grooves  10  oriented close to the horizontal, which will be referred to as “horizontal grooves”. Only one horizontal groove  10  and part of another are visible in FIG.  1 . Each vertical groove  3  meets one of the horizontal grooves  10  to create an L-shaped configuration. Each of the horizontal grooves  10  has another groove  11  branching off from it that runs up to the top of the base  1 . Catch pieces  4  cross two of the horizontal grooves  10 . The catch pieces  4  consist of a long flat stick of the same material as the base  1  and an angled portion at the top  13 . Each catch  4  is fixed to the base  1  at the bottom and is flexible. The two catch pieces  4  rest in two additional grooves parallel to the vertical grooves  3 . The two catch pieces are located 120 degrees from each other and are on the back half of the base, opposite the foot  5  (see FIG.  8 A). 
   Referring to  FIG. 2 , the second part of the knife block is the cap piece  2 , and it is made of a clear or translucent plastic polymer of a depth and circumference to fit snugly around the cylindrical part of the base. The cap has holes  6  in its top that are designed to allow the knife handles to pass through when the holes and handles align. Three protrusions  12  are located at the bottom of the cap  2 . The protrusions  12  are spaced equally around the bottom of the cap  2 . If the bottom of the cap  2  is visualized as a clock, the protrusions  12  are placed at two o&#39;clock, six o&#39;clock and ten o&#39;clock. 
   Referring to  FIGS. 1 and 2 , the protrusions  12  fit into the vertical grooves  3  and horizontal grooves  10  in the base  1  to guide the motion of the cap  2 . The rising and lowering motion of the cap  2  is guided by the protrusions  12  moving in the vertical grooves  3 . The rotating motion of the cap  2  is guided by the protrusions  12  moving along the horizontal grooves. The short groove  11  allows the cap  2  to be removed from the base  1  for the purpose of cleaning. 
     FIG. 3  shows the unlocked knife block assembly. In this position, the cap  2  fits down over the base  1  with the knife handle  7  protruding through the holes  6  in the cap  2 . The holes  6  in the cap  2  are aligned with the knife handle  7  and the slots  8  in the base  1 , and the knives are accessible to the user (see FIG.  7 B). In addition, the protrusions in the cap  2  are at the bottom of the vertical grooves in the base  1 , although this is not visible in FIG.  3 . 
     FIG. 4  shows the locked knife block assembly. In this position, the cap  2  is raised so that the knife handle  7  is completely inside the cap  2 . In addition, the cap  2  is rotated 90 degrees from the unlocked position so the holes  6  are oriented to block the knife handle  7  from passing through them (see FIG.  7 A). When the cap  2  is in the locked position, two catch pieces  4  hold the protrusions in place and restrict the movement of the cap  2 . To unlock the knife block assembly, the user depresses the catch pieces  4  with thumb and forefinger and rotates the cap  2  ninety degrees with the other hand. The protrusions in the cap  2  follow the horizontal grooves  10  until they reach the vertical grooves  3 , and then the user lowers the cap  2  down onto the base  1  and the knife block assembly is unlocked as shown in FIG.  3 . 
     FIG. 5  shows the knife block assembly in the locked position. The back  9  of the base  1 , opposite the foot  5 , is truncated to allow the knife block assembly to be placed against the back wall of a kitchen countertop. 
     FIG. 6  shows the base of the knife block assembly. 
     FIG. 7A  shows the knife block assembly in the locked position. The orientation of the holes  6  in the cap  2  are 90 degrees away from the orientation of the knife handles  7  and the slots  8  in the base  1 , confining the knives within the cap  2 . 
     FIG. 7B  shows the knife block assembly in the unlocked position. The orientation of the holes  6  in the cap  2  matches the knife handles  7  and the slots  8  in the base  1 , making the knives accessible. 
     FIG. 8A  shows the locked position. The catch pieces  4  block the protrusions  12  of the cap  2 , thus preventing the motion of the cap. Specifically, it is the wider sides of the angled top portions  13  of the catch pieces  4  that block the movement of the protrusions  12 . The narrower side of the angled top portion  13  of the catch piece  4  is flush with the inside of the horizontal groove  10 . The main body of the catch piece  4  is flush with the outside surface of the base  1 . 
     FIG. 8B  shows the catch piece  4  when depressed by the thumb or index finger of the user, which frees the protrusion  12  to allow rotation of the cap  2 . The protrusions are shown moving along the horizontal grooves  10  as the cap  2  rotates. 
     FIG. 8C  shows the cap in the unlocked position. The protrusions are not shown because they are at the bottom of the vertical grooves  3 , and the section is cut near the top of the base as shown in  FIG. 6  line II—II. The catch  4  is in its normal un-depressed position. 
     FIG. 8D  shows the cap  2  rotating toward the locked position. The angle of the catch top portions  13  causes the catch pieces  4  to depress as the protrusions  12  of the cap  2  rotate. The next thing to happen after what is shown in  FIG. 8D  is that the protrusions  12  pass the angled portions  13 , and the catch pieces  4  return to their normal un-depressed positions, blocking the movement of the protrusion  12 , and locking the knife block assembly as shown in FIG.  8 A.
This invention is a knife block for storing cutlery that can be locked to prevent the removal of the knives. An adjustable cap piece rests in one of two positions. In the unlocked position, the cap fits snugly over the base and the knives project up through holes in the cap. In the locked position, the cap is raised and rotated so the knives are inside the cap and inaccessible. The locking mechanism requires adult understanding and hand size to operate, greatly enhancing kitchen safety. In addition, this locking knife block requires no alteration of the knives.