Back to results
US 4,364,174 AGranted
Apparatus and improved method of manufacturing handles for butterfly defense knife
OwnerLester De Asisinventor
Life of this patent
Estimating the term…
Abstract
An improved method of manufacturing the handle sections of a butterfly knife through a selected series of steps by specifically machining each handle section from a single piece of raw stock to produce a handle of superior strength, superior gripping means, and light weight.
Claims27
A method of manufacturing each of the two handle sections of a butterfly knife wherein each handle section is machined from a single piece of rectangular raw stock which contains an upper face and a lower face, a first end face and a second end face, and a first lateral face and a second lateral face, which comprises:
- a. cutting said piece of raw stock to a selected length;
- b. squaring said first end face to a selected dimension;
- c. squaring said second end face to a selected dimension;
- d. machining a central longitudinal slot in the longitudinal lower face of said piece of raw stock such that the central longitudinal slot extends along the entire length of the lower face and extends transversely through most of the depth of said piece of raw stock;
- e. cutting a first transverse slot in the central portion of said first end face such that the first transverse slot extends inwardly to a selected longitudinal distance along said upper face of said piece of raw stock and coincides with said central longitudinal slot along the lateral depth of said raw stock;
- f. cutting a second transverse slot in the central portion of said second end face such that the second transverse slot extends inwardly to a selected longitudinal distance along said upper face of said piece of raw stock and coincides with said central longitudinal slot along the lateral depth of said raw stock;
- g. machining a first lateral recess to a selected depth into said first lateral face of said piece of raw stock such that the first lateral recess extends transversely through the entire height of the first lateral face and extends longitudinally along the central portion of the first lateral face, beginning at a first recess edge and terminating in a second recess edge;
- h. machining a dovetail into said first recess edge and into said second recess edge of said first lateral recess;
- i. machining a second lateral recess to a selected depth into said second lateral face of said piece of raw stock such that the second lateral recess extends transversely through the entire height of the second lateral face and extends longitudinally along the central portion of the second lateral face, beginning at a first recess edge and terminating in a second recess edge;
- j. machining a dovetail into said first recess edge and into said second recess edge of said second lateral recess;
- k. tapering said lower face such that said piece of raw stock is tapered a selected amount from said second end face to said first end face;
- l. rounding the surfaces of said first and said second lateral faces adjacent said second end face such that the surfaces of said first and second lateral faces form part of the circumference of a circle which has its central point located at the center of said second end face;
- m. rounding the surfaces of said first and said second lateral faces adjacent said first end face such that the surfaces of said first and second lateral faces form part of the circumference of a circle which has its central point located at the center of said first end face;
- n. rounding said first end face;
- o. machining a depression into said upper face along each edge of said first transverse slot;
- p. drilling a central hole through said first and said second lateral face adjacent said second end face;
- g. drilling a central hole through said first and said second lateral face near said first end face;
- r. machining a multiplicity of partial holes into said first lateral recess such that said holes are aligned along the entire length of said first lateral recess and do not penetrate the lateral wall of said piece of raw stock so as not to come in contact with said central longitudinal slot;
- s. machining a multiplicity of partial holes into said second lateral recess such that said holes are aligned along the entire length of said second lateral recess and do not penetrate the lateral wall of said piece of raw stock so as not to come in contact with said central longitudinal slot;
- t. cutting a first piece of material to the exact interior dimensions of said first lateral recess;
- u. securing said first piece of material into said first lateral recess by applying adhesive material into each of said multiplicity of partial holes in the recess and along the interior surface of the first piece of material;
- v. cutting a second piece of material to the exact interior dimensions of said second lateral recess;
- and
- w. securing said second piece of material into said second lateral recess by applying adhesive material into each of said multiplicity of partial holes in the recess and along the interior surface of the second piece of material;
- x. whereby two such machined pieces of raw stock are used to form handle sections of a knife and are attached through said holes in their lateral faces near said first end face to the tang of a knife blade to form the handle of the knife such that the knife blade is completely concealed within said central longitudinal slot of each handle section when the knife is in a closed position and form the handle of the knife by having their upper faces adjacent each other when the knife is in an opened position.
22 more elements
A method of manufacturing each of the two light weight handle sections of a butterfly knife wherein each handle section is machined from a single piece of rectangular raw stock which contains an upper face and a lower face, a first end face and a second end face, and a first lateral face and a second lateral face, which comprises:
- a. cutting said piece of raw stock to a selected length;
- b. squaring said first end face to a selected dimension;
- c. squaring said second end face to a selected dimension;
- d. machining a central longitudinal slot in the longitudinal lower face of said piece of raw stock such that the central longitudinal slot extends along the entire length of the lower face and extends transversely through most of the depth of said piece of raw stock;
- e. cutting a first transverse slot in the central portion of said first end face such that the first transverse slot extends inwardly to a selected longitudinal distance along said upper face of said piece of raw stock and coincides with said central longitudinal slot along the lateral depth of said raw stock;
- f. cutting a second transverse slot in the central portion of said second end face such that the second transverse slot extends inwardly to a selected longitudinal distance along said upper face of said piece of raw stock and coincides with said central longitudinal slot along the lateral depth of said raw stock;
- g. tapering said lower face such that said piece of raw stock is tapered a selected amount from said second end face to said first end face;
- h. rounding said first end face;
- i. machining a depression into said upper face along each edge of said first transverse slot;
- j. drilling a central hole through said first and said second lateral face adjacent said second end face;
- k. drilling a central hole through said first and said second lateral face near said first end face;
- l. drilling a multiplicity of variable sized large holes into said first lateral face such that the large holes are aligned along the longitudinal axis of said first lateral face and extend through the entire thickness of said first lateral face and into said central longitudinal slot;
- m. drilling a multiplicity of small holes into said first lateral face such that the small holes are interspersed between said variable sized large holes and also extend through the entire thickness of said first lateral face and into said central longitudinal slot;
- n. drilling a multiplicity of variable sized large holes into said second lateral face such that the large holes are aligned along the longitudinal axis of said second lateral face and extend through the entire thickness of said second lateral face and into said central longitudinal slot;
- and
- o. drilling a multiplicity of small holes into said second lateral face such that the small holes are interspersed between said variable sized large holes and also extend through the entire thickness of said second lateral face and into said central longitudinal slot;
- p. whereby two such machined pieces of raw stock are used to form light weight handle sections of a knife and are attached through said holes in their lateral faces near said first end face to the tang of a knife blade to form the light weight handle of the knife such that the knife blade is completely concealed within said central longitudinal slot of each handle section when the knife is in a closed position and form the handle of the knife by having their upper faces adjacent each other when the knife is in an opened position.
14 more elements
A handle section for use as part of the two section handle of a butterfly knife wherein each section comprises:
- a. a longitudinal upper face;
- b. a longitudinal lower face;
- c. a first end face;
- d. a second end face;
- e. a first lateral face;
- f. a second lateral face;
- g. a central longitudinal slot in said longitudinal lower face extending along the entire length of said longitudinal lower face and extending transversely through most of the depth of said section;
- h. a first transverse slot in the central portion of said first end face wherein the first transverse slot extends inwardly to a selected longitudinal distance along said longitudinal upper face and coincides with said central longitudinal slot;
- i. a second transverse slot in the central portion of said second end face wherein the second transverse slot extends inwardly to a selected longitudinal distance along said longitudinal upper face and coincides with said central longitudinal slot;
- j. said first lateral face containing a first lateral recess therein, wherein the recess extends transversely through the entire height of the first lateral face and extends longitudinally along the central portion of the first lateral face, beginning at a first recess edge and terminating in a second recess edge;
- k. said first recess edge in said first lateral face being dovetailed;
- l. said second recess edge in said first lateral face being dovetailed;
- m. said second lateral face containing a second lateral recess therein, wherein the recess extends transversely through the entire height of the second lateral face and extends longitudinally along the central portion of the first lateral face, beginning at a first recess edge and terminating in a second recess edge;
- n. said first recess edge in said second lateral face being dovetailed;
- o. said second recess edge in said second lateral face being dovetailed.
- p. said longitudinal lower face being tapered from said second end face to said first end face;
- q. said first and said second lateral faces adjacent said second end face being rounded such that the surfaces of said first and second lateral faces form part of the circumference of a circle which has its central point located at the center of said second end face;
- r. said first and said second lateral faces adjacent said first end face being rounded such that the surfaces of said first and second lateral faces form part of the circumference of a circle which has its central point located at the center of said second end face;
- s. said first end face being rounded;
- t. said upper face containing a depression along each edge of said first transverse slot;
- u. said first and said second lateral faces containing a central hole through their entire thickness adjacent said second end face;
- v. said first and said second lateral faces containing a central hole through their entire thickness near said first end face;
- w. said first lateral recess containing a multiplicity of partial holes, wherein said holes are aligned along the entire length of said first lateral recess and do not penetrate the lateral wall of said recess so as not to come in contact with said central longitudinal slot;
- x. said second lateral recess containing a multiplicity of partial holes, wherein said holes are aligned along the entire length of said second lateral recess and do not penetrate the lateral wall of said recess so as not to come in contact with said central longitudinal slot;
- y. said first lateral recess containing gripping means therein;
- z. said second lateral recess containing gripping means therein;
- and
- aa. said gripping means having associated therewith adhesive material which rigidly attaches said gripping means into said first and said second lateral recesses, wherein said adhesive material is placed into each of said multiplicity of partial holes and along the interior surface of said gripping means;
- bb. whereby two such sections become handle sections of a knife and are attached through said holes in their lateral faces near said first end to the tang of a knife blade to form the light weight handle of the knife such that the knife blade is completely concealed within said central longitudinal slot of each handle section when the knife is in a closed position and form the handle of the knife by having their upper faces adjacent each other when the knife is in an opened position.
26 more elements
A light weight handle section for use as part of the two section handle of a butterfly knife wherein each section comprises:
- a. a longitudinal upper face;
- b. a longitudinal lower face;
- c. a first end face;
- d. a second end face;
- e. a first lateral face;
- f. a second lateral face;
- g. a central longitudinal slot in said longitudinal lower face extending along the entire length of said longitudinal lower face and extending transversely through most of the depth of said section.
- h. a first transverse slot in the central portion of said first end face wherein the first transverse slot extends inwardly to a selected longitudinal distance along said longitudinal upper face and coincides with said central longitudinal slot;
- i. a second transverse slot in the central portion of said second end face wherein the second transverse slot extends inwardly to a selected longitudinal distance along said longitudinal upper face and coincides with said central longitudinal slot;
- j. said longitudinal lower face being tapered from said second end face to said first end face;
- k. said first end face being rounded;
- l. said upper face containing a depression along each edge of said first transverse slot;
- m. said first and said second lateral faces containing a central hole through their entire thickness adjacent said second end face;
- n. said first and said second lateral faces containing a central hole through their entire thickness near said first end face;
- o. said first lateral face containing a multiplicity of variable sized large holes along its longitudinal axis, wherein the large holes extend through the entire thickness of said first lateral face and into said central longitudinal slot;
- p. said first lateral face containing a multiplicity of small holes interspersed between said variable sized large holes and also extending through the entire thickness of said first lateral face and into said central longitudinal slot;
- q. said second lateral face containing a multiplicity of variable sized large holes along its longitudinal axis, wherein the large holes extend through the entire thickness of said second lateral face and into said central longitudinal slot;
- and
- r. said second lateral face containing a multiplicity of small holes interspersed between said variable sized large holes and also extending through the entire thickness of said second lateral face and into said central longitudinal slot;
- s. whereby two such sections become light weight handle sections of a knife and are attached through said holes in their lateral faces near said first end to the tang of a knife blade to form the light weight handle of the knife such that the knife blade is completely concealed within said central longitudinal slot of each handle section when the knife is in a closed position and form the handle of the knife by having their upper faces adjacent each other when the knife is in an opened position.
17 more elements
Dependencies are inferred from the claim text.