Improved locking mechanism for knives with replaceable blades

Abstract

This invention provides an improved locking mechanism for a knife utilizing a replaceable blade. The improved locking mechanism works in conjunction with a first locking mechanism to more securely retain the replaceable blade within the knife, the first locking mechanism being structured and configured to hold the replaceable blade. The improved locking mechanism can be adjacent to the first locking mechanism in a first position, thereby preventing movement of the first locking mechanism, or the improved locking mechanism can be moved away from the first locking mechanism to a non-adjacent position, thereby allowing movement of the first locking mechanism.

Description

Technical Field

[0001] The embodiments of the present invention generally relate to knives. More specifically, one embodiment of the invention is an improved locking mechanism for a folding knife with a replaceable blade element. Another embodiment is an improved locking mechanism for a non-folding knife with a replaceable blade element. Background Technology

[0002] A knife typically consists of a handle and a blade that is interconnected therewith. Some knives employ blades that are rotatably interconnected and selectively lockable to the handle. When the knife is not in use, it is sheathed, or in the case of a folding knife, the blade is folded into the handle. When in use, the rotatable blade extends from the handle and locks into place. Such locking mechanisms are known and engage a portion of the blade to hold it in place until the user disengages the locking mechanism, which allows the blade to fold into an opening in the handle to conceal the entire blade or a portion thereof.

[0003] Regardless of the type of knife, a very sharp cutting edge is expected, similar to the sharpness provided by razor blades. Replaceable blades must inherently be able to be secured or locked within the knife for proper use. Non-secured blades are of little value and pose a potential danger to the user. However, some uses of secured replaceable blades can generate significant forces on the blade in a plane parallel to its cutting edge. For example, a saw blade mounted / secured within a blade holder can generate considerable friction when cutting dense materials. This force applied to a mounted / secured blade could overwhelm the current locking mechanism that holds the blade within the blade holder, causing the blade to accidentally detach from the knife.

[0004] The following disclosure describes an improved locking mechanism for a knife with a replaceable blade, which further secures the replaceable blade within the blade holder of the knife. This improved locking mechanism facilitates easy interconnection. Summary of the Invention

[0005] The summary of this invention is neither intended nor should be construed as representing the entire extent and scope of the invention. Furthermore, references to "the invention" or any aspect thereof herein should be understood as referring to certain embodiments of the invention and are not necessarily construed as limiting all embodiments to the specific description. The invention is set forth in various levels of detail in the summary, the accompanying drawings, and the detailed description, and the inclusion or exclusion of elements, components, etc., in this summary is not intended to limit the scope of the invention. Further aspects of the invention will become apparent from the detailed description, particularly when taken in conjunction with the accompanying drawings.

[0006] The present invention provides a knife comprising: a blade receiving portion having a longitudinal axis, the blade receiving portion being configured to receive a replaceable blade; a first locking mechanism disposed within the blade receiving portion, wherein the first locking mechanism includes a biasing element having a first engaging element near a distal end of the biasing element, and the first engaging element being configured to engage with a corresponding second engaging element on the replaceable blade to retain the replaceable blade within the blade receiving portion; a release mechanism configured to disengage the first engaging element from the second engaging element; and a second locking mechanism, wherein the second locking mechanism is positionable between a first position adjacent to the biasing element to prevent movement of the biasing element, and a second position distal to the biasing element and configured to allow movement of the biasing element.

[0007] Preferably, the biasing element is a movable hinge.

[0008] Preferably, the second locking mechanism is disposed in a plane parallel to the movable hinge.

[0009] Preferably, the second locking mechanism operates in a plane parallel to the longitudinal axis of the blade receiving portion.

[0010] Preferably, the first engaging element is either a protrusion or an opening.

[0011] Preferably, the second engaging element is either the protrusion or the opening.

[0012] Preferably, the first engaging element is a protrusion, the second engaging element is an opening, and the second locking mechanism is a slidable tab that, when in the first position, covers the distal end of the biasing element.

[0013] Preferably, the second locking mechanism further includes a cover, a sliding rod, a position retainer, and at least two position recesses disposed in a plane parallel to the movable hinge. The position retainer is an assembly of either the sliding rod or the cover, and the at least two position recesses are an assembly of either the sliding rod or the cover. The at least two position recesses include a distal position recess and a proximal position recess. The first position of the second locking mechanism positions the position retainer within the distal position recess, and the second position of the second locking mechanism positions the position retainer within the proximal position recess.

[0014] Preferably, the cover is positioned away from the handle, the at least two position recesses are components of the rear portion of the cover, and the position retainer is a component of the sliding rod.

[0015] Preferably, the cover is positioned on the handle, the position retainer is an assembly of the rear half of the handle cover, and the at least two position recesses are assemblies of the sliding rod.

[0016] Preferably, the release mechanism is a release button.

[0017] Preferably, the second locking mechanism is slidable between the first position and the second position.

[0018] Preferably, it is combined with the replaceable blade, wherein the first position clamps the biasing element between the second locking mechanism and the replaceable blade.

[0019] Preferably, the blade receiving portion includes two blade supports, the biasing element is an extension of one of the two blade supports, the second locking mechanism is positioned on a first side of the biasing element, and the other blade support of the two blade supports is positioned on a second side of the biasing element.

[0020] The present invention also provides a method for locking a blade in a knife, the method comprising: sliding the blade into a blade holder of the knife until an opening at the end of the blade engages with a protrusion on a first locking mechanism, wherein the first locking mechanism includes the protrusion at the end of a biasing element; and pushing a sliding rod along a longitudinal axis until at least a portion of the sliding rod covers the protrusion of the first locking mechanism. Attached Figure Description

[0021] The following description should be read with reference to the accompanying drawings. The drawings, not necessarily drawn to scale, depict examples and are not intended to limit the scope of this disclosure. This disclosure will be more fully understood by considering the following description of various examples in conjunction with the accompanying drawings, in which:

[0022] Figure 1 This is a rear view of one embodiment of a replaceable blade knife with an improved lock;

[0023] Figure 2 This is an example of a replaceable blade for the knife;

[0024] Figure 3 This is an exploded view of the knife;

[0025] Figure 4 This is a partially exploded view of the knife;

[0026] Figure 5 This is a partially exploded view of the knife;

[0027] Figure 6 This is a partially exploded view of the knife in the locked position;

[0028] Figure 7This is a partial bottom view of the knife;

[0029] Figure 8 This is a front perspective view of another embodiment of a replaceable blade knife with an improved lock;

[0030] Figure 9 This is a rear view of the knife;

[0031] Figure 10 This is a partially exploded view of the knife;

[0032] Figure 11 This is a partially exploded view of the knife;

[0033] Figure 12 This is a partially exploded view of the knife in the unlocked position;

[0034] Figure 13 This is a partial view of the knife;

[0035] Figure 14 This is a partial view of the knife;

[0036] Figure 15 This is a partial view of the knife;

[0037] Figure 16 This is a partially exploded view of another embodiment of a replaceable blade knife with an improved lock;

[0038] Figure 17 This is a partial view of the knife;

[0039] Figure 18 This is a partial view of the knife;

[0040] Figure 19 This is a partial view of the knife;

[0041] The above overview is not intended to describe every instance or implementation of this disclosure. The following description illustrates various illustrative embodiments in more detail.

[0042] Summary of attached image labels:

[0043] 100-knife example

[0044] 102-Blade housing

[0045] 104A-First Blade Holder

[0046] 104B-Second Blade Holder

[0047] 106-Spacer

[0048] 110 - First Locking Mechanism

[0049] 112-Moving hinge

[0050] 114-Prominent part

[0051] 120 - Second Locking Mechanism

[0052] 122-Sliding rod

[0053] 124-Position Holder

[0054] 134-First position notch

[0055] 136-Second position notch

[0056] 140A - Front Cover

[0057] 140B - Back Cover

[0058] 150-blade release

[0059] 180-blade

[0060] 190-Opening

[0061] 200-knife example

[0062] 202-Blade Receiving Section

[0063] 204A-First Blade Holder

[0064] 204B-Second Blade Holder

[0065] 206-Spacer

[0066] 210 - First Locking Mechanism

[0067] 212-Moving Hinge

[0068] 214-Prominent part

[0069] 220 - Second Locking Mechanism

[0070] 222-Sliding rod

[0071] 224-Position Holder

[0072] 228 - Footing

[0073] 234-First Position Holder

[0074] 236-Second Position Holder

[0075] 240A-Front Cover

[0076] 240B - Back Cover

[0077] 250-blade release

[0078] 260-Pad

[0079] 262-Pad Opening

[0080] 265-Pivot Point

[0081] 300-blade example

[0082] 302-Blade Receiving Section

[0083] 304A - First Blade Holder

[0084] 304B-Second Blade Holder

[0085] 306-Spacer

[0086] 308-Pad

[0087] 310 - First Locking Mechanism

[0088] 312-Moving Hinge

[0089] 314 - Protrusion

[0090] 320 - Second Locking Mechanism

[0091] 322-Sliding rod

[0092] 324-Position Holder

[0093] 328-Standing Foot

[0094] 334 - First Position Holder

[0095] 336-Second Position Holder

[0096] 340A - Front Cover

[0097] 340B - Back Cover

[0098] 360-pad

[0099] 365-Pivot Point Detailed Implementation

[0100] This disclosure relates to locking mechanisms for replaceable blade knives, and more specifically, to improved locking mechanisms for fixed and folded replaceable blades. Various embodiments are described in detail with reference to the accompanying drawings, wherein the same reference numerals may be used throughout the various views to denote the same parts and assemblies. Reference to the various embodiments does not limit the scope of the systems and methods disclosed herein. Examples of constructions, dimensions, and materials may be shown for various elements; those skilled in the art will recognize that many of the examples provided have suitable alternatives that can be utilized. Any examples set forth in this specification are not intended to be limiting, but merely illustrate some embodiments of the many possible implementations of the said systems and methods. It should be understood that various omissions and substitutions of equivalents are contemplated where circumstances may indicate or present an advantageous position, but such omissions and substitutions are intended to cover the application or embodiments without departing from the spirit or scope of this disclosure. It should also be understood that the wording and terminology used herein are for illustrative purposes only and should not be considered limiting.

[0101] The described locking mechanism can be considered an improvement upon the replaceable blade knife first described in Chinese Patent CN103786170B and its successor, US Patent US9687987B2. Similarly, the described locking mechanism can be considered an improvement upon the replaceable blade knife first described in US10493641B2 and its successor. All of the above patents are incorporated herein by reference.

[0102] Figure 1-7 A first embodiment of an improved locking mechanism for a knife with replaceable blades is disclosed. Figure 2 A blade 100 with a blade receiving portion 102 is shown, which may include a first blade holder 104A and a second blade holder 104B; the two blade holders may be spaced apart by a spacer, or the two blade holders may be constructed without a spacer. For example, the first blade holder 104A may include a thicker structure at its proximal end to act as a spacer, or vice versa. Figure 4 As shown, spacer 106 or other such spacer methods can provide an opening in blade receiving portion 102 for inserting a replaceable blade, for example, Figure 2 The blade shown is shown. As illustrated, the blade 100 is a fixed blade, and since rotation is not required, the blade holder can be combined with the blade's shank.

[0103] In other versions of knife 100, the blade receiving portion 102 may be constructed as a single piece, providing the same opening as in versions with two blade supports. As with earlier versions of replaceable blade knives described in CN103786170B and its descendants, the profile of the blade support may include an offset to facilitate insertion of a replaceable blade. As with older versions, knife 100 may include a blade release button 150. Such a button may include a coil spring that holds the button in position until it is pressed. Once pressed, the blade release button 150 may engage a movable hinge 112, which is part of a first locking mechanism 110. The first locking mechanism 110 may be formed in the proximal end of the blade receiving portion 102 (as used herein, the term proximal refers to the end of the knife closest to the user when the handle is held). The first locking mechanism 110 may include a protrusion 114, the structure of which may be configured and arranged to engage with the opening on the proximal end of the replaceable blade (e.g., as shown in the image). Figure 2 The opening 190 on the blade 180 shown engages. By inserting the blade 180 into the blade receiving portion 102, the protrusion 114 on the movable hinge 112 can be displaced until the protrusion 114 fully engages with the opening 190, thereby securing the blade 180 in the blade receiving portion 102.

[0104] In earlier versions of this type of replaceable blade knife, the first locking mechanism included a locking mechanism for securing the replaceable blade within the knife. However, due to the nature of the movable hinge, some significant external force could disengage the protrusion from the blade opening, allowing the blade to be released from the knife without pressing the release button. To ensure that such extreme forces do not overwhelm the first locking mechanism 110, a second locking mechanism 120 can be included in the replaceable blade knife 100.

[0105] like Figure 3-7 As shown, the second locking mechanism 120 can be positioned above the first locking mechanism 110. The second locking mechanism 120 can be accommodated within the cover 140A / B of the knife 100. (Reference) Figure 4 and 6 The structure of the second locking mechanism 120 can be set and configured to move along axis A. Figure 4 In the diagram, the second locking mechanism 120 is shown in the unlocked position. In the unlocked position, the second locking mechanism 120 can be positioned near the proximal end of the blade 100. In this arrangement, the second locking mechanism 120 may be adjacent to but not cover the movable hinge 112 of the first locking mechanism 110. In this arrangement, the movable hinge 112 can be deflected via the release button 150, and undesirably by a large external force. However, in the locked position, as... Figure 6As shown, the second locking mechanism 120 can be positioned directly above the movable hinge 112 of the first locking mechanism 110. The second locking mechanism 120 can be achieved by sliding along axis A toward the distal end of the knife 100 (as used herein, the term distal refers to the end of the knife furthest from the user when the handle is held). In the locked position, the second locking mechanism 120 can be positioned above the movable hinge 112 of the first locking mechanism 110. The second locking mechanism 120 can prevent any movement of the movable hinge 112 of the first locking mechanism 110, thereby preventing the protrusion 114 from disengaging from the knife opening 190, whether due to the use of the blade release button 150 or due to a large external force.

[0106] The two positions of the second locking mechanism 120 can be maintained by using position retainers 134 or 136. These position retainers 134, 136 can engage with structures on the second locking mechanism 120. For example, the detent 124 can engage with a recess in the position retainer 134 or 136 located within the second handle cover 140B, such as... Figure 5 As shown in the illustration. Those skilled in the art will understand that such latches and recesses are interchangeable with position retainers, such that the latch can be located on the second locking mechanism 120 or the second handle cover 140B, and the recess can be located on the other of the second locking mechanism or the second handle cover. The second locking mechanism 120 can be positioned by the user via the sliding rod 122, as... Figure 4 and 6 As shown in the diagram, the user can move the sliding lever 122 back and forth to lock and unlock the second locking mechanism 120. Once the user moves the second locking mechanism 120 to the unlocked position, the user can press the blade release button 150 to remove the replaceable blade 180. Once removed, the user can replace the blade 180 with a blade of a different profile, or with a new blade that has not yet become dull from use.

[0107] In some embodiments, the protrusion 114 may include a ramp structure, such as Figure 7 As shown, this simplifies the engagement of replaceable blades within blade holders 104A and 104B. Figure 4 In the middle, the protrusion 114 is shown as being located at the distal end of the movable hinge 112.

[0108] Figure 8-15 A second embodiment of an improved locking mechanism for a knife with replaceable blades is disclosed. (See also...) Figure 8As shown, the blade 200 may have a blade receiving portion 202, which may include a first blade holder 204A and a second blade holder 204B; the two blade holders may be spaced apart by a spacer, or the two blade holders may be constructed without a spacer. For example, the first blade holder 204A may include a thicker construction at its proximal end to act as a spacer, or vice versa. A spacer 206 or other such spacer method may provide an opening in the blade receiving portion 202 for inserting a replaceable blade, for example... Figure 2 The blade 180 is shown. As illustrated, the knife 200 is a folding knife; therefore, the blade holders 204A-204B can be formed as separate components from the shank, which can include the entire blade receiving portion 202 of the knife 200. The shank may include two blade pads 260, which can be positioned on opposite sides of the blade receiving portion 202 and include a pivot point 265. The entire blade receiving portion 202 can be rotated about the pivot point 265 to allow an inserted replaceable blade to be nested between the two blade holders 204A-204B, which are nested between the two blade pads 260.

[0109] Furthermore, in Figure 8 In this embodiment, knife 200 includes a first handle cover 240A and a second handle cover 240B. A blade release button 250 is disposed between the first handle cover 240A and the blade liner 260. In other versions of knife 200, the blade receiving portion 202 may be constructed as a single piece, providing the same opening as in versions with two blade supports. As with earlier versions of replaceable blade knives described in CN103786170B and its descendants, the profile of the blade support may include an offset to facilitate insertion of a replaceable blade. As with the older versions, knife 200 may include a blade release button 250. Such a button may include a coil spring that maintains the button's position until it is pressed. Once pressed, the blade release button 250 may engage a movable hinge 212, which is part of a first locking mechanism 210. The first locking mechanism 210 may be formed in the proximal end of the blade receiving portion 202. The first locking mechanism 210 may include a protrusion 214, the structure of which may be configured and arranged to interact with an opening on the proximal end of the replaceable blade (e.g., as shown in the image). Figure 2 The opening 190 on the blade 180 shown engages. By inserting the blade 180 into the blade receiving portion 202, the protrusion 214 on the movable hinge 212 can be displaced until the protrusion 214 fully engages with the opening 190, thereby securing the blade 180 in the blade receiving portion 202.

[0110] In earlier versions of this type of replaceable blade knife, the first locking mechanism included a locking mechanism for securing the replaceable blade within the knife. However, due to the nature of the movable hinge, some significant external force could disengage the protrusion from the blade opening, allowing the blade to be released from the knife without pressing the release button. To ensure that such extreme forces do not overwhelm the first locking mechanism 210, a second locking mechanism 220 can be included in the replaceable blade knife 200.

[0111] like Figure 10-16 As shown, the second locking mechanism 220 can be positioned above the first locking mechanism 210. In the blade 200, the blade liner 260 can be positioned between the first locking mechanism 210 and the second locking mechanism 220. Because of the increased separation between the two locking mechanisms, the foot 228 can be positioned on the second locking mechanism 220. Figure 14 As shown, the foot 228 reflects the outline of the first locking mechanism 210, and its width is almost equal to the width of the blade pad 260, as... Figure 12 As shown in the diagram. The blade liner 260 may further include a liner opening 262, as... Figure 13 As shown, it can be configured to move the foot 228 together with the second locking mechanism 220 from the locked position to the unlocked position.

[0112] The second locking mechanism 220 can be accommodated within the second cover 240B of the blade 200. (Reference) Figure 10 and 12 The structure of the second locking mechanism 220 can be set and configured to move along axis B. Figure 12 In the diagram, the second locking mechanism 220 is shown in the unlocked position. In the unlocked position, the second locking mechanism 220 can be positioned toward the distal end of the blade receiving portion 202. In this arrangement, the second locking mechanism 220 may be adjacent to but not cover the movable hinge 212 of the first locking mechanism 210. In this arrangement, the movable hinge 210 can be deflected via the release button 250, and unintentionally by a large external force. However, in the locked position, as... Figure 10 As shown, the second locking mechanism 220 can be positioned directly above the movable hinge 212 of the first locking mechanism 210. The second locking mechanism 220 can achieve this position by sliding along axis B toward the proximal end of the blade 200. In the locked position, the foot 228 of the second locking mechanism 220 can be positioned above the movable hinge 212 of the first locking mechanism 210. The second locking mechanism 220 can prevent any movement of the movable hinge 212 of the first locking mechanism 210, thereby preventing the protrusion 214 from disengaging from the blade opening 190, whether due to the use of the blade release button 250 or due to a large external force.

[0113] The two positions of the second locking mechanism 220 can be maintained by using a position retainer 224. The position retainer 224 can engage with a structure on the second locking mechanism 220. For example, a recess 234 or 236 on the sliding rod 222 can engage with a snap-fit ​​of the position retainer 224 located inside the second handle cover 240B, such as... Figure 14 As shown in the illustration. Those skilled in the art will understand that such latches and recesses are interchangeable with position retainers, such that the recess can be located on the slide bar 222 or inside the handle cover 240B, and the latch can be located on the other of the slide bar or the inside of the handle cover. The second locking mechanism 220 can be positioned by the user via the slide bar 222, as shown in the illustration. Figure 10 , 12 As shown in Figure 14, the user can move the sliding lever 222 back and forth to lock and unlock the second locking mechanism 220. Once the user moves the second locking mechanism 220 to the unlocked position, they can press the blade release button 250 to remove the replaceable blade 180. Once removed, the user can replace the blade 180 with a blade of a different profile, or with a new blade that has not yet become dull from use.

[0114] In some embodiments, the protrusion 214 may include a ramp structure, such as Figure 15 As shown, this simplifies the engagement of replaceable blades within blade holders 204A and 204B. Figure 15 The image shows a partial cutout of the second locking mechanism 220, with the protrusion 214 located at the distal end of the movable hinge 212.

[0115] Figure 16-19 A third embodiment of an improved locking mechanism for a knife with replaceable blades is disclosed. (Compared to...) Figure 8 Similar to the second embodiment shown, the blade 300 may have a blade receiving portion 302, which may include a first blade holder 304A and a second blade holder 304B; the two blade holders may be spaced apart by a spacer, or the two blade holders may be constructed without a spacer. For example, the first blade holder 304A may include a thicker structure at its proximal end to act as a spacer, or vice versa. Figure 17 As shown, spacer 306 or other such spacer methods can provide an opening in blade receiving portion 302 for inserting a replaceable blade, for example... Figure 2 The blade 180 is shown. As illustrated, the knife 300 is a folding knife; therefore, the blade holders 304A-304B can be formed as separate components from the shank, which can include the entire blade receiving portion 302 of the knife 300. The shank may include two blade pads 360, which can be positioned on opposite sides of the blade receiving portion 302, as shown. Figure 16-17 As shown in the diagram, and including pivot point 365. The entire blade receiving portion 302 can rotate about pivot point 365 to allow an inserted replaceable blade to be nested between two blade holders 304A-304B, which are nested between two blade pads 360.

[0116] Furthermore, in Figure 19 In the middle, the knife 300 may include a first handle cover (not shown) and a second handle cover 340B. With Figure 8 Similar to Embodiment 2 shown, the blade release button is positioned between the first handle cover and the blade liner 360. In other versions of the knife 300, the blade receiving portion 302 may be constructed as a single piece, providing the same opening as in versions with two blade supports. As with earlier versions of the replaceable blade knife described in CN103786170B and its descendants, the profile of the blade support may include an offset to facilitate insertion of the replaceable blade. As with the older versions, the knife 300 may include a blade release button. Such a button may include a coil spring that holds the button in position until it is pressed. Once pressed, the blade release button may engage a movable hinge 312, which is part of a first locking mechanism 310. The first locking mechanism 310 may be formed into the proximal end of the blade receiving portion 302. The first locking mechanism 310 may include a protrusion 314, the structure of which may be configured and arranged to engage with the opening on the proximal end of the replaceable blade (e.g., as shown in the image). Figure 2 The opening 190 on the blade 180 shown engages. By inserting the blade 180 into the blade receiving portion 302, the protrusion 314 on the movable hinge 312 can be displaced until the protrusion 314 fully engages with the opening 190, thereby securing the blade 180 in the blade receiving portion 302.

[0117] In earlier versions of this type of replaceable blade knife, the first locking mechanism included a locking mechanism for securing the replaceable blade within the knife. However, due to the nature of the movable hinge, some significant external force could disengage the protrusion from the blade opening, allowing the blade to be released from the knife without pressing the release button. To ensure that such extreme forces do not overwhelm the first locking mechanism 310, a second locking mechanism 320 can be included in the replaceable blade knife 300.

[0118] like Figure 16-17 As shown, the second locking mechanism 320 can be positioned above the first locking mechanism 310. In the blade 300, the blade liner 360 can be positioned between the first locking mechanism 310 and the second locking mechanism 320. Because the separation between the two locking mechanisms increases, Figure 19The foot 328 shown can be mounted on the movable hinge 312 of the first locking mechanism 310. The foot 328 can reflect the outline of the first locking mechanism 310, and its width is approximately equal to the width of the blade pad 360. The blade pad 360 may further include a pad opening, similar to pad opening 262, which can be configured to allow the foot 328 to move together with the second locking mechanism 320 from the locked position to the unlocked position.

[0119] The second locking mechanism 320 can be accommodated within the second cover 340B of the blade 300. (Reference) Figure 16 and 17 The structure of the second locking mechanism 320 can be set and configured to move along axis C. Figure 17 In the diagram, the second locking mechanism 320 is shown in the unlocked position. In the unlocked position, the second locking mechanism 320 can be positioned toward the distal end of the blade 300. In this arrangement, the second locking mechanism 320 may be adjacent to but not cover the movable hinge 312 of the first locking mechanism 310. In this arrangement, the movable hinge 310 can be deflected via a release button and, unintentionally, by a large external force. However, in the locked position, as... Figure 16 As shown, the second locking mechanism 320 can be positioned directly above the movable hinge 312 of the first locking mechanism 310. The second locking mechanism 320 can achieve this position by sliding along axis C toward the proximal end of the blade 300. In the locked position, the second locking mechanism 320 can be positioned above the movable hinge 312 of the first locking mechanism 310 via a foot 328. The second locking mechanism 320 can prevent any movement of the movable hinge 312 of the first locking mechanism 310, thereby preventing the protrusion 314 from disengaging from the blade opening 190, whether due to the use of the blade release button 350 or due to a large external force.

[0120] The two positions of the second locking mechanism 320 can be maintained by using the position holder 324, such as Figure 19 As shown in the diagram, the position retainer 324 can engage with a structure on the sliding rod 322 of the second locking mechanism 320. For example, the recess 334 or 336 can engage with a snap-fit ​​of the position retainer 324 located inside the handle cover 340B, as shown in the diagram. Figure 19 As shown in the illustration. Those skilled in the art will understand that such latches and recesses are interchangeable with position retainers, such that the recess can be located on the second locking mechanism 320 or inside the cover 340B, and the latch can be located on the other of the second locking mechanism or the inside of the cover. The second locking mechanism 320 can be positioned by the user via the sliding rod 322, as... Figure 16-17As shown in Figure 19, the user can move the sliding lever 322 back and forth to lock and unlock the second locking mechanism 320. Once the user moves the second locking mechanism 320 to the unlocked position, they can press the blade release button to remove the replaceable blade 180. Once removed, the user can replace the blade 180 with a blade of a different profile, or with a new blade that has not yet become dull from use.

[0121] In some embodiments, the protrusion 314 may include a ramp structure, similar to Figure 15 The ramp shown simplifies the engagement of replaceable blades within blade holders 304A and 304B. Figure 18 The first locking mechanism 310 is shown, wherein the protrusion 314 is located on the distal end of the movable hinge 312.

[0122] Those skilled in the art related to this disclosure and its subject matter will recognize that embodiments may contain fewer features than those shown in any individual embodiments described herein by way of example or otherwise covered. The embodiments described herein are not intended to be an exhaustive representation of how various features can be combined and / or arranged. Therefore, these embodiments are not mutually exclusive combinations of features; rather, as will be understood by those skilled in the art, various embodiments may contain combinations of different individual features selected from different individual embodiments. Furthermore, unless otherwise indicated, elements described with respect to one embodiment may be implemented in other embodiments, even if such elements are not described in such embodiments. While dependent claims in the claims may refer to a specific combination with one or more other claims, other embodiments may also include combinations of dependent claims with the subject matter of each other dependent claim, or combinations of one or more features with other dependent or independent claims. Such combinations are suggested herein unless stated as not desired. Furthermore, features of any other independent claim are intended to be included, even if that claim is not directly dependent on the independent claim.

Claims

1. A knife, characterized in that, Include: A blade receiving portion having a longitudinal axis, the blade receiving portion being structured and configured to receive a replaceable blade; A first locking mechanism is disposed within the blade receiving portion, wherein... The first locking mechanism includes a biasing element, the biasing element having a first engaging element near its distal end, and The first engagement element is configured to engage with a corresponding second engagement element on the replaceable blade to retain the replaceable blade within the blade receiving portion; A release mechanism configured to disengage the first engaging element from the second engaging element; as well as The second locking mechanism, among which The second locking mechanism can be positioned between the first position and the second position. The first position is adjacent to the biasing element to prevent the biasing element from moving, and The second position is located away from the bias element and is configured to allow the bias element to move.

2. The knife according to claim 1, characterized in that, The biasing element is a movable hinge.

3. The knife according to claim 2, characterized in that, The second locking mechanism is positioned in a plane parallel to the movable hinge.

4. The knife according to claim 1, characterized in that, The second locking mechanism operates in a plane parallel to the longitudinal axis of the blade receiving portion.

5. The knife according to claim 1, characterized in that, The first engaging element is one of the protrusions or openings.

6. The knife according to claim 5, characterized in that, The second engaging element is either the protrusion or the opening.

7. The knife according to claim 6, characterized in that, The first engaging element is a protrusion. The second engaging element is an opening, and The second locking mechanism is a slidable tab that, when in the first position, covers the distal end of the biasing element.

8. The knife according to claim 1, characterized in that, The second locking mechanism further includes a cover, a sliding rod, a position retainer, and at least two position recesses. The position holder and the at least two position notches are arranged in a plane parallel to the movable hinge. The position holder is an assembly of either the sliding rod or the cover. The at least two positional notches are components of either the sliding rod or the cover. The at least two position notches include a distal position notch and a proximal position notch. The first position of the second locking mechanism positions the position holder within the distal position recess, and The second position of the second locking mechanism positions the position holder within the proximal position recess.

9. The knife according to claim 8, characterized in that, The cover is positioned away from the handle. The at least two notches are components of the rear portion of the cover, and The position holder is an assembly of the sliding rod.

10. The knife according to claim 8, characterized in that, The cover is positioned above the handle. The position retainer is an assembly of the rear half of the handle cover, and The at least two notches are components of the sliding rod.

11. The knife according to claim 1, characterized in that, The release mechanism is a release button.

12. The knife according to claim 1, characterized in that, The second locking mechanism can slide between the first position and the second position.

13. The knife according to claim 1, characterized in that, It is combined with the replaceable blade, wherein the first position clamps the biasing element between the second locking mechanism and the replaceable blade.

14. The knife according to claim 1, characterized in that, The blade receiving portion includes two blade supports. The biasing element is an extension of one of the two blade holders. The second locking mechanism is positioned on the first side of the biasing element, and Another blade holder of the two blade holders is positioned on the second side of the biasing element.

15. A method for locking a blade in a knife, characterized in that, The method includes: Slide the blade into the blade holder of the knife until the opening on the end of the blade engages with the protrusion on the first locking mechanism, wherein the first locking mechanism includes the protrusion on the end of the biasing element; as well as Push the sliding rod along the longitudinal axis until at least a portion of the sliding rod covers the protrusion of the first locking mechanism.

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