JP2004337610A - Utility knife - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foldable utility knife easily folding a blade into a handle, firmly holding the blade, facilitating its replacement, being simply used, and dispensing with a high cost for the manufacture and maintenance. <P>SOLUTION: This utility knife 1 is provided with a handle 2 and a blade holder 3 which is pivotally mounted on the handle for movement from an unfolded position to a folded position. The handle has a space adapted to receive the blade holder when the blade holder is in its folded position. The blade holder includes a main wall 34 and a guard wall 35 pivotally mounted on the main wall to pivot from an open position to a closed position overlying the main wall. The main wall is adapted to hold a blade so that a blade is interposed between the main wall and guard wall when the guard wall is in its closed position. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a utility knife, and more particularly, to a foldable utility knife that can fold the blade into a handle when the knife is not used.

  Universal knives have been used for many years. Some utility knives that have been used have a blade attached to a foldable blade holder in the handle when the knife is not in use. However, some of these universal knives have a large number of moving parts, which makes them difficult to use and expensive to manufacture. In addition, for some such versatile knives, changing blades is a complex task and requires special tools.

  It is an object of the present invention to solve the above problems and to provide an improved universal knife in which the blade holder can be easily folded into the handle.

  It is another object of the present invention to provide an improved utility knife in which the blade is securely held on the utility knife.

  It is another object of the present invention to provide an improved utility knife provided with improved means for replacing the utility knife blade.

  It is another object of the present invention to provide an improved universal knife that is simple to use and not expensive to manufacture and maintain.

  Other and further objects of the present invention will become apparent from the examples described below and set forth in the claims. In addition, one of ordinary skill in the art will have various advantages in practicing the present invention not described herein.

  According to one aspect of the present invention, in a utility knife having a handle and a blade holder, the blade holder is pivotally attached to the handle and can be moved from a deployed state to a folded state, and the handle is When the blade holder is in its folded state, the blade holder has a space that can accommodate at least a part of the blade holder, and the blade holder can pivot from a main wall to a closed position covering the main wall from an open position. A guard wall attached to the main wall, the main wall holding the blade such that the blade is interposed between the main wall and the guard wall when the guard wall is in the closed position. A universal knife characterized by having means for performing

  The blade holder has a rear end and a front end, the front end includes the guard wall and the main wall, and the rear end is pivotally attached to the handle, and has an upper edge and a lower edge. And an edge.

  The guard wall may be attached to the main wall so as to be pivotable about a pivot axis adjacent to the lower edge of the rear end.

  A blade lock assembly may be provided relative to the main wall and the guard wall, the blade lock assembly pivoting from an open position to a closed position over the main wall and the guard wall.

  The blade lock assembly may be pivotally mounted to the rear end adjacent the upper edge.

  The blade lock assembly may comprise a U-shaped clip having a top wall and a pair of side walls, the side walls sandwiching the main wall and the guard wall when the clip is in its closed position.

  The clip may have a forward finger extending therefrom.

  The rear end may have a finger knob extending therefrom.

  The handle comprises a pair of spaced apart handle halves, the handle having a pivot lock lever assembly mounted in the space within the handle, the lock lever assembly comprising a front arm, a rear arm, , A lock finger extending from the front arm.

  The rear end of the blade holder may have a groove capable of receiving the lock finger when the blade holder is in a deployed state.

  By providing spring means below the rear arm of the lock lever assembly to urge the rear arm upward and the front arm downward, the lock finger enters the groove and the spring Raising the front arm by depressing the rear arm against the tension of the means, pulling out the locking finger from the groove, and pivoting the blade holder from the deployed state to the folded state with respect to the handle to handle the handle. May be accommodated in the above-mentioned space.

  The handle has a notch at an upper edge thereof, the rear arm protrudes above the notch, and the front arm is raised upward by pushing down the rear arm at the notch to raise the lock finger. You may make it possible to extract from the said lock groove.

  The blade holding means may have a pair of protrusions provided on the main wall of the blade holder, and the protrusions may be respectively inserted into corresponding grooves provided on the blade.

  When the guard wall is in its closed position, a screw means for holding the guard wall at a fixed position on the main wall may be provided.

  The screw means may extend from the guard wall to the main wall.

  The handle comprises a pair of spaced apart handle halves, the handle having a pivot lock lever assembly mounted in the space within the handle, the lock lever assembly comprising a front arm, a rear arm, , A lock finger extending from the front arm.

  The rear end of the blade holder may have a groove capable of receiving the lock finger when the blade holder is in a deployed state.

  By providing spring means below the rear arm of the lock lever assembly to urge the rear arm upward and the front arm downward, the lock finger enters the groove and the spring Raising the front arm by depressing the rear arm against the tension of the means, pulling out the locking finger from the groove, and pivoting the blade holder from the deployed state to the folded state with respect to the handle to handle the handle. May be accommodated in the above-mentioned space.

  The handle has a notch at an upper edge thereof, the rear arm protrudes above the notch, and the front arm is raised upward by pushing down the rear arm at the notch to raise the lock finger. You may make it possible to extract from the said lock groove.

  The blade holding means may have a pair of protrusions provided on the main wall of the blade holder, and the protrusions may be respectively inserted into corresponding grooves provided on the blade.

  According to another aspect of the present invention, in a universal knife having a handle and a blade holder, the blade holder can be pivotally attached to the handle and move from a deployed state to a folded state. When the blade holder is in its folded state, the blade holder has a space that can accommodate at least a part of the blade holder, the blade holder is attached to the main wall, and the main wall is attached to the main wall from an open position. A guard wall movable to a closed position covering the main wall, wherein the main wall holds the blade so that the blade is interposed between the main wall and the guard wall when the guard wall is in the closed position. A universal knife characterized by having means for performing

  The blade holder has a rear end and a front end, the front end includes the guard wall and the main wall, and the rear end is pivotally attached to the handle, and has an upper edge and a lower edge. And an edge.

  A blade lock assembly may be provided relative to the main wall and the guard wall, the blade lock assembly pivoting from an open position to a closed position over the main wall and the guard wall.

  The blade lock assembly may be pivotally mounted to the rear end adjacent the upper edge.

  The blade lock assembly may comprise a U-shaped clip having a top wall and a pair of side walls, the side walls sandwiching the main wall and the guard wall when the clip is in its closed position.

  The clip may have a forward finger extending therefrom.

  The rear end may have a finger knob extending therefrom.

  The handle comprises a pair of spaced apart handle halves, the handle having a pivot lock lever assembly mounted in the space within the handle, the lock lever assembly comprising a front arm, a rear arm, , A lock finger extending from the front arm.

  The rear end of the blade holder may have a groove capable of receiving the lock finger when the blade holder is in a deployed state.

  By providing spring means below the rear arm of the lock lever assembly to urge the rear arm upward and the front arm downward, the lock finger enters the groove and the spring Raising the front arm by depressing the rear arm against the tension of the means, pulling out the locking finger from the groove, and pivoting the blade holder from the deployed state to the folded state with respect to the handle to handle the handle. May be accommodated in the above-mentioned space.

  The handle has a notch at an upper edge thereof, the rear arm protrudes above the notch, and the front arm is raised upward by pushing down the rear arm at the notch to raise the lock finger. You may make it possible to extract from the said lock groove.

  The blade holding means may have a pair of protrusions provided on the main wall of the blade holder, and the protrusions may be respectively inserted into corresponding grooves provided on the blade.

  When the guard wall is in its closed position, a screw means for holding the guard wall at a fixed position on the main wall may be provided.

  The screw means may extend from the guard wall to the main wall.

  The handle comprises a pair of spaced apart handle halves, the handle having a pivot lock lever assembly mounted in the space within the handle, the lock lever assembly comprising a front arm, a rear arm, , A lock finger extending from the front arm.

  The rear end of the blade holder may have a groove capable of receiving the lock finger when the blade holder is in a deployed state.

  By providing spring means below the rear arm of the lock lever assembly to urge the rear arm upward and the front arm downward, the lock finger enters the groove and the spring Raising the front arm by depressing the rear arm against the tension of the means, pulling out the locking finger from the groove, and pivoting the blade holder from the deployed state to the folded state with respect to the handle to handle the handle. May be accommodated in the above-mentioned space.

  The handle has a notch at an upper edge thereof, the rear arm protrudes above the notch, and the front arm is raised upward by pushing down the rear arm at the notch to raise the lock finger. You may make it possible to extract from the said lock groove.

  The blade holding means may have a pair of protrusions provided on the main wall of the blade holder, and the protrusions may be respectively inserted into corresponding grooves provided on the blade.

  The handle comprises a pair of spaced apart handle halves, the handle having a pivot lock lever assembly mounted in the space within the handle, the lock lever assembly comprising a front arm, a rear arm, , A lock finger extending from the front arm.

  The rear end of the blade holder may have a groove capable of receiving the lock finger when the blade holder is in a deployed state.

  By providing spring means below the rear arm of the lock lever assembly to urge the rear arm upward and the front arm downward, the lock finger enters the groove and the spring Raising the front arm by depressing the rear arm against the tension of the means, pulling out the locking finger from the groove, and pivoting the blade holder from the deployed state to the folded state with respect to the handle to handle the handle. May be accommodated in the above-mentioned space.

  The handle has a notch at an upper edge thereof, the rear arm protrudes above the notch, and the front arm is raised upward by pushing down the rear arm at the notch to raise the lock finger. You may make it possible to extract from the said lock groove.

  The blade holding means may have a pair of protrusions provided on the main wall of the blade holder, and the protrusions may be respectively inserted into corresponding grooves provided on the blade.

  According to the present invention, there is provided a use, wherein the blade holder can be easily folded into the handle, with improved means for fixing the blade to the universal knife as well as improved means for replacing the blade of the knife. Can provide a universal knife that is simple and not expensive to manufacture and maintain.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  Referring to the drawings, and in particular to the preferred embodiment shown in FIGS. 1 to 7, the universal knife 1 of the present invention has a handle 2 and a blade holder 3.

The handle 2 comprises a pair of handle halves 2 A and 2 B , each half having an outer wall 11, an upper edge 7 and a lower edge 9. Rear spacer 4 is provided between the handle halves 2 A and 2 B, formed with keep spaced handle halves 2 A and 2 B, the space 5 between the handle halves 2 A and 2 B are doing. A spacer 4, the handle halves 2 A and 2 B are held together by fasteners 6, holding them together by the fastener 6 through the spacer 4 and the handle halves 2 A and 2 B . Upper edge 7 of the handle halves 2 A and 2 B (i.e., the handle 2) has a finger notch 8, the lower edge 9 of the handle halves 2 A and 2 B (i.e., the handle 2), the user's finger May be formed in a wave shape so that the handle 2 can be gripped. If desired, attach the clip 10 to the sidewall 11 of the handle halves 2 A and / or 2 B, may be able to fix the utility knife 1 including the user's belt or other convenient location.

Interposed between the handle halves 2 A and 2 B, and, along the upper edge 7 of the handle halves 2 A and 2 B, the locking lever assembly 15 (FIGS. 3 to 5) is provided, this the lock lever assembly 15 between the handle halves 2 a and 2 B, pivotally attached to the pivot pin 16 as a fulcrum. This pivot pin 16 extends through the two handle halves 2A and 2B and the lock lever assembly 15. The lock lever assembly 15 is a two-arm lever having a front arm 17 and a rear arm 18, respectively. The forearm 17 includes a locking finger 19 extending downward. A spring 14 (V-shaped or U-shaped) is provided below the rear arm 18 of the lock lever assembly 15, and the spring 14 is normally pressed against the lower edge of the rear arm 18 and a pivot pin 16 is provided. , The rear arm 18 is urged upward and the front arm 17 is urged downward, so that the rear arm 18 protrudes above the notch 8. When the rear arm 18 of the lock lever assembly 15 is pushed down by a finger through the notch 8 against the action of the spring 14, the front arm 17 is raised.

  The blade holder 3 according to the invention has a rear end 31 and a front end 32 which are integrally formed with one another.

The rear end 31 of the blade holder 3 includes a trailing edge 31 A, and the lower edge portion 31 B, the upper edge 31 C. Blade holder 3, the space portion 5 between the handle halves 2 A and 2 B, pivotally attached to the pivot pin 30 as a fulcrum. When the finger knob 41 is provided at the rear end portion 31, the turning movement of the blade holder 3 with respect to the handle 2 can be facilitated. Upper edge 31 C of the rear end portion 31 has a groove 33, when the blade holder 3 is in its extended state, that is deployed state, the locking finger 19 which extends below the lock assembly 15 enters into the groove 33 It has been like that.

The front end 32 of the blade holder 3 includes a thin main wall 34 and a thin guard wall 35 that is pivotally mounted on the main wall 34 with a pivot pin 36 as a fulcrum. The main wall 34 can hold the blade B, the blade B has a lower cutting edge 37, and a notch 38 spaced provided on the upper edge 39. The main wall 34 has a pair of protrusions 40 spaced apart extending from the main wall 34, is fitted an upper notch 38 of the blade B to the projections 40, to retain the blade B in place of the main wall 34 Can be done. When the guard wall 35 is in the raised closed position, the guard wall 35 holds the blade B in place over the blade B, when the guard wall 35 is below the open position to expose the blade B.

A blade lock assembly 45 is attached along the upper edge of the blade holder 3, and is pivotally attached to the rear end 31 of the blade holder 3 around a pivot pin 46 as a fulcrum. The blade lock assembly 45 is U-shaped and has a split or split upper wall 48, a pair of side walls 49 hanging from the upper wall 48, and a forwardly extending front finger tab 50. When the blade lock assembly or clip 45 is pivoted downward with the pivot pin 46 as a fulcrum, the side wall 49 sandwiches the main wall 34 and the guard wall 35 of the blade holder 3, and the upper wall 48 becomes the main wall 34, the guard wall 35 and the blade. overlies the top of the B, the blade B is locked in position. When it is desired to remove and replace the blade B , the clip 45 is pivoted upward by the finger tab 50 to release the main wall 34, the guard wall 35 and the blade B. Thus, the guard wall 35 can be turned in a direction away from the blade B (as shown in FIG. 6), so that the blade B is exposed, and the blade B can be removed and replaced.

In operation of the universal knife 1 shown in the preferred embodiment of FIGS. 1 to 7, the universal knife is put into a deployment operation state in which the blade holder 3 is not folded and ready for use. The blade B is held on the main wall 34 by a projection 40 extending to the notch 38 of the upper edge 39 of the blade B. The lock finger 19 formed on the forearm 17 of the lock lever assembly 15 is in a lower position due to the pressure of the spring 14 acting on the rear arm 18 and is located in the groove 33 provided in the blade holder 3, Holder 3 is kept in its deployed state. The rear arm 18 of the lock lever assembly 15 is in its raised position and projects above the finger notch 8 on the upper edge 7 of the handle 2.

When the universal knife 1 is to be folded and inoperable, the rear arm 18 of the lock assembly 15 is pushed down by the finger through the notch 8 against the urging force of the spring 14. As a result, the front arm of the lock assembly 15 is raised, the lock finger 19 is pulled out from the groove 33 to release the blade holder 3, and the blade holder 3 is pivoted downward about the pivot pin 30 as a fulcrum (FIG. 4). This may be done by depressing the finger knob (or finger grip) 41. Then, to pivot the blade holder 3 downward, completely housed in the space portion 5 between the handle halves 2 A and 2 B (FIG. 5). When the pressure on the rear arm 18 is released, the spring 14 moves the rear arm 18 to the original raised position by the tension of the spring 14. Thus, pressing the locking finger 19 to rear edge 31 A and the lower edge portion 31 B of the blade holder 3, to hold the blade holder 3 in its folded state.

If you want to use blade B , follow the reverse procedure. The blade holder 3 is turned in the opposite direction. Preferably, the rear arm 18 of the lock lever assembly 15 is pushed down again with fingers to assist in the deployment of the blade holder 3. When the blade holder 3 is continuously rotated counterclockwise (as shown in FIG. 4), the lock finger 19 of the front arm 17 enters the groove 33 provided in the rear end portion 31 of the blade holder 3, and the blade holder 3 is moved. Keep extended.

When it is desired to replace the blade B , the blade holder 3 is placed in its deployed state (as shown in FIG. 6), and the clip 45 is lifted by the finger tab 50 with the pivot pin 46 as a fulcrum. As a result, the guard wall 35 is released, and the guard wall 35 is pivoted downward about the pivot pin 36 as a fulcrum to expose the blade B. Then, the blade B can be taken out from the blade holder 3, and a new blade B can be attached here. Again, the guard wall 35 is pivoted upward to return to the position where the blade B is covered, and the clip 45 is lowered to lock the blade B, the main wall 34 and the guard wall 35 in place.

  Referring to the embodiment of the universal knife 1 shown in FIGS. 8 to 11, this embodiment is similar to the embodiment of the universal knife shown in FIGS. These are indicated by reference numbers.

In all respects, the structure and operation of this embodiment are the same as those of the embodiment shown in FIGS. However, in this embodiment, the pivotable guard wall 35 of the blade holder 3 is held at a fixed position by the screw member 55. The screw member 55 penetrates the pivotable guard wall 35 at the opening 57 and extends into the main wall 34 at the opening 56. When it is desired to remove the blade B , the screw member 55 is removed, and the guard wall 35 is rotated downward with the pivot pin 36 as a fulcrum to expose the blade B. This blade can be removed and replaced. After replacing the blade B , the guard wall 35 is rotated upward with the pivot pin 36 as a fulcrum, and returned to the operating position covering the blade B. If the screw member 55 is attached again through the openings 57-56, the guard wall 35 and the blade B can be held at fixed positions.

  It should be apparent to those skilled in the art that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the scope of the claims.

1 is a perspective view of a universal knife according to the present invention. It is a top view of the universal knife shown in FIG. FIG. 3 is a sectional view taken along lines 3-3 in FIG. FIG. 4 is a sectional view similar to FIG. 3 showing the utility knife in a partially folded state. FIG. 4 is a sectional view similar to FIG. 3 showing the utility knife in a fully folded state. FIG. 4 is a side view of a universal knife showing how to remove and replace the blade. It is a side view of the other side of the universal knife. FIG. 3 is a perspective view of a variant of the universal knife according to the invention. FIG. 9 is a plan view of the universal knife shown in FIG. 8. FIG. 4 is a side view of a universal knife, showing a method of removing a blade. It is a side view of the other side of a knife.

Explanation of reference numerals

1 utility knife 2 handle 2 A, 2 B handle halves 3 blade holder 4 rear space 5 space 6 fastener 7 upper edge 8 notch 9 lower edge 10 clip 11 outer wall 14 spring 15 locking lever assembly 16 pivot pin 17 Front arm 18 Rear arm 19 Lock finger 30 Pivot pin 31 Rear end 31 A Rear edge 31 B Lower edge 31 C Upper edge 32 Front end 33 Groove 34 Main wall 35 Guard wall 36 Pivot pin 37 Cutting edge 38 Notch 39 Upper edge 40 Projection 41 Finger knob 45 Blade lock assembly 46 Pivot pin 48 Upper wall 49 Side wall 50 Front finger tab 55 Screw member 56, 57 Opening
B blade

Claims (44)

  In a universal knife having a handle and a blade holder, the blade holder is pivotally attached to the handle and can move from a deployed state to a folded state, and the handle is moved when the blade holder is in its folded state. A space portion capable of accommodating at least a part of the blade holder, wherein the blade holder is pivotally attached to the main wall so as to pivot from an open position to a closed position covering the main wall. A wall having a means for holding the blade such that the blade is interposed between the main wall and the guard wall when the guard wall is in the closed position. And a universal knife.   The blade holder has a rear end and a front end, the front end includes the guard wall and the main wall, and the rear end is pivotally attached to the handle, and has an upper edge and a lower edge. The utility knife of claim 1 having an edge.   The universal knife according to claim 2, wherein the guard wall is attached to the main wall so as to be pivotable about a pivot axis adjacent to the lower edge of the rear end.   4. The utility knife of claim 3, further comprising a blade lock assembly that pivots from an open position to a closed position over the main wall and the guard wall relative to the main wall and the guard wall.   The utility knife of claim 4, wherein the blade lock assembly is pivotally mounted to the rear end adjacent the upper edge.   6. The blade lock assembly of claim 5, wherein the blade lock assembly comprises a U-shaped clip having an upper wall and a pair of side walls, the side walls configured to sandwich the main wall and the guard wall when the clip is in its closed position. The universal knife described.   The utility knife of claim 6, wherein the clip has a forward finger extending therefrom.   The utility knife of claim 7, wherein the rear end has a finger knob extending therefrom.   The handle comprises a pair of spaced apart handle halves, the handle having a pivot lock lever assembly mounted in the space within the handle, the lock lever assembly comprising a front arm, a rear arm, The utility knife of claim 8, comprising a lock finger extending from said forearm.   10. The utility knife of claim 9, wherein the trailing end of the blade holder has a groove capable of receiving the lock finger when the blade holder is in a deployed state.   By providing spring means below the rear arm of the lock lever assembly to urge the rear arm upward and the front arm downward, the lock finger enters the groove and the spring Raising the front arm by depressing the rear arm against the tension of the means, pulling out the locking finger from the groove, and pivoting the blade holder from the deployed state to the folded state with respect to the handle to handle the handle. The universal knife according to claim 10, which can be accommodated in the space inside the knife.   The handle has a notch at an upper edge thereof, the rear arm protrudes above the notch, and the front arm is raised upward by pushing down the rear arm at the notch to raise the lock finger. The universal knife according to claim 11, which can be extracted from the lock groove.   13. The blade holder according to claim 12, wherein the blade holder has a pair of protrusions provided on the main wall of the blade holder, and the protrusions can be respectively inserted into corresponding grooves provided on the blade. Universal knife.   4. The utility knife of claim 3, further comprising screw means for holding said guard wall at a fixed position on said main wall when said guard wall is in its closed position.   15. The utility knife of claim 14, wherein said screw means extends from said guard wall to said main wall.   The handle comprises a pair of spaced apart handle halves, the handle having a pivot lock lever assembly mounted in the space within the handle, the lock lever assembly comprising a front arm, a rear arm, The utility knife of claim 14, comprising a locking finger extending from the forearm.   17. The utility knife of claim 16, wherein the rear end of the blade holder has a groove capable of receiving the lock finger when the blade holder is in the deployed state.   By providing spring means below the rear arm of the lock lever assembly to urge the rear arm upward and the front arm downward, the lock finger enters the groove and the spring Raising the front arm by depressing the rear arm against the tension of the means, pulling out the locking finger from the groove, and pivoting the blade holder from the deployed state to the folded state with respect to the handle to handle the handle. The universal knife of claim 17, which can be accommodated in the space within.   The handle has a notch at an upper edge thereof, the rear arm protrudes above the notch, and the front arm is raised upward by pushing down the rear arm at the notch to raise the lock finger. 20. The utility knife of claim 18, which can be withdrawn from said lock groove.   20. The blade holder according to claim 19, wherein the blade holding means has a pair of protrusions provided on the main wall of the blade holder, and the protrusions can be respectively inserted into corresponding grooves provided on the blade. Universal knife.   In a universal knife having a handle and a blade holder, the blade holder is pivotally attached to the handle and can move from an unfolded state to a folded state, and the handle is moved when the blade holder is in its folded state. A space portion capable of accommodating at least a part of the blade holder, wherein the blade holder is attached to the main wall, and is a guard wall movable from an open position to a closed position covering the main wall. Wherein the main wall has means for holding the blade such that the blade is interposed between the main wall and the guard wall when the guard wall is in the closed position. A universal knife to do.   The blade holder has a rear end and a front end, the front end includes the guard wall and the main wall, and the rear end is pivotally attached to the handle, and has an upper edge and a lower edge. 22. The utility knife of claim 21 having an edge.   23. The utility knife of claim 22, further comprising a blade lock assembly that pivots from an open position to a closed position over the main wall and the guard wall with respect to the main wall and the guard wall.   24. The utility knife of claim 23, wherein the blade lock assembly is pivotally mounted to the rear end adjacent the upper edge.   25. The blade lock assembly of claim 24, wherein the blade lock assembly comprises a U-shaped clip having an upper wall and a pair of side walls, the side walls configured to sandwich the main wall and the guard wall when the clip is in its closed position. The universal knife described.   26. The utility knife of claim 25, wherein the clip has a forward finger extending therefrom.   27. The utility knife of claim 26, wherein the rear end has a finger knob extending therefrom.   The handle comprises a pair of spaced apart handle halves, the handle having a pivot lock lever assembly mounted in the space within the handle, the lock lever assembly comprising a front arm, a rear arm, 28. The utility knife of claim 27, comprising a locking finger extending from said forearm.   29. The utility knife of claim 28, wherein the trailing end of the blade holder has a groove capable of receiving the lock finger when the blade holder is in a deployed state.   By providing spring means below the rear arm of the lock lever assembly to urge the rear arm upward and the front arm downward, the lock finger enters the groove and the spring Raising the front arm by depressing the rear arm against the tension of the means, pulling out the locking finger from the groove, and pivoting the blade holder from the deployed state to the folded state with respect to the handle to handle the handle. 30. The utility knife of claim 29, which can be accommodated in said space within.   The handle has a notch at an upper edge thereof, the rear arm protrudes above the notch, and the front arm is raised upward by pushing down the rear arm at the notch to raise the lock finger. 31. The utility knife of claim 30, which can be withdrawn from the lock groove.   32. The blade holder according to claim 31, wherein the blade holding means has a pair of protrusions provided on the main wall of the blade holder, and the protrusions can be respectively inserted into corresponding grooves provided on the blade. Universal knife.   23. The utility knife of claim 22, further comprising screw means for holding said guard wall in place on said main wall when said guard wall is in its closed position.   34. The utility knife of claim 33, wherein said screw means extends from said guard wall to said main wall.   The handle comprises a pair of spaced apart handle halves, the handle having a pivot lock lever assembly mounted in the space within the handle, the lock lever assembly comprising a front arm, a rear arm, 35. The utility knife of claim 34, having a locking finger extending from said forearm.   36. The utility knife of claim 35, wherein the trailing end of the blade holder has a groove capable of receiving the lock finger when the blade holder is in a deployed state.   A spring means is provided below the rear arm of the lock lever assembly to urge the rear arm upward and the front arm downward, thereby causing the lock finger to enter the groove, and Raising the front arm by depressing the rear arm against the tension of the means, disengaging the locking finger from the groove, and pivoting the blade holder relative to the handle from a deployed state to a folded state to handle the handle. 37. The utility knife of claim 36, wherein said utility knife can be received in said space therein.   The handle has a notch at an upper edge thereof, the rear arm projects above the notch, and the rear arm is pushed down at the notch to raise the front end, thereby raising the lock finger. 38. The utility knife of claim 37, which can be withdrawn from the lock groove.   39. The blade holder according to claim 38, wherein the blade holding means has a pair of protrusions provided on the main wall of the blade holder, and the protrusions can respectively enter corresponding grooves provided in the blade. Universal knife.   The handle comprises a pair of spaced apart handle halves, the handle having a pivot lock lever assembly mounted in the space within the handle, the lock lever assembly comprising a front arm, a rear arm, 22. The utility knife of claim 21, comprising a locking finger extending from said forearm.   41. The utility knife of claim 40, wherein the trailing end of the blade holder has a groove capable of receiving the lock finger when the blade holder is in a deployed state.   By providing spring means below the rear arm of the lock lever assembly to urge the rear arm upward and the front arm downward, the lock finger enters the groove and the spring Raising the front arm by depressing the rear arm against the tension of the means, disengaging the locking finger from the groove, and pivoting the blade holder relative to the handle from a deployed state to a folded state to handle the handle. 42. The utility knife of claim 41, wherein said utility knife can be accommodated in said space.   The handle has a notch at an upper edge thereof, the rear arm protrudes above the notch, and the front arm is raised upward by pushing down the rear arm at the notch to raise the lock finger. 43. The utility knife of claim 42, which can be withdrawn from said lock groove. 44. The blade holder according to claim 43, wherein the blade holding means has a pair of protrusions provided on the main wall of the blade holder, and the protrusions can enter respective corresponding grooves provided on the blade. Universal knife.

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