Switchable blade utility knife

Abstract

The utility model discloses a kind of switchable blade utility knife, belong to manual cutter, existing utility knife is only configured with one holder, and it needs to frequently change blade when using different types of blade work, the utility model is configured by being arranged in parallel first holder and second holder in shell, still configure switching structure to switch the state of push button assembly to be selectively carried with holder by push button assembly. Therefore, the state of push button assembly is switched by switching structure, and selectively carried with holder by push button assembly, so that the required blade is stretched out shell for use. The utility model can install different blades for selection on different holders, and one cutter can be carried to realize the selection of two blades when working, avoid the trouble of carrying two cutters, also save use cost. The utility model can also install same blade on different holders to switch another blade for use when one blade is worn or damaged, without immediately replacing the worn or damaged blade.

Description

Technical Field

[0001] This invention pertains to manual knives, specifically a practical knife with interchangeable blades, allowing users to switch blades as needed. Background Technology

[0002] Existing utility knives consist of a knife holder housed within a casing, with a single blade mounted on the holder. The blade is extended from the casing for use or retracted for storage by moving the holder. During use, if the blade wears out or a different type of blade is required, it must be replaced, making it inconvenient. In particular, when a task requires the continuous use of different blade types, using the aforementioned utility knife necessitates constant blade changes, wasting time and significantly reducing work efficiency. To save time, users may carry two utility knives, which further increases portability and operating costs. Summary of the Invention

[0003] The technical problem to be solved and the technical task proposed by the present invention is to overcome the defect of existing practical knives that only have one knife holder, which requires frequent blade replacement when using different types of blades. The invention provides a practical knife with switchable blades, which allows users to switch blades according to their needs and improve work efficiency.

[0004] To achieve the above objectives, the present invention provides a switchable blade utility knife, comprising: case; The first and second tool holders are mounted side by side in the housing and can move back and forth. Each tool holder is equipped with a cutting blade. A push button assembly, which protrudes from the housing, is used to selectively move either the first tool post or the second tool post back and forth within the housing; A switching structure is configured to switch the state of the push button assembly so that the push button assembly can selectively move either the first tool post or the second tool post.

[0005] Therefore, by switching the state of the push button assembly via a switching structure, the push button assembly selectively moves the tool holder, thereby extending the desired blade out of the housing for use. Accordingly, different blades can be installed on different tool holders for selection, or identical blades can be installed to switch to another blade when one wears or is damaged, without immediately replacing the worn or damaged blade. This practical knife structure allows for the selection of two blades with a single tool, avoiding the inconvenience of carrying two separate tools and saving on operating costs. The ability to install identical blades on the tool holder extends continuous working time, reduces blade replacement time, and improves work efficiency.

[0006] For ease of operation, especially for operation with both hands, the push button assembly is located on the spine of the housing, allowing the thumb to operate the push button assembly when the housing is held. The push button assembly includes a pusher extending toward the first or second tool post, which is oscillatingly configured to oscillate toward either the first or second tool post. This oscillating configuration facilitates changing the position of the pusher.

[0007] To allow the push button assembly to move back and forth, the assembly includes a seat that moves back and forth along the housing, with a pusher rotatably mounted on the seat. To facilitate the repositioning of the pusher, the seat has a circular hole. The pusher has a cylinder and a pusher portion eccentrically positioned on the cylinder. The cylinder is located within the circular hole and constrained within it by a bottom cover. The pusher portion extends through the bottom cover toward either the first or second tool holder. This structure allows for flexible repositioning of the pusher. To prevent the pusher from losing its working position, especially to prevent it from deviating from its working position during assembly, the bottom cover has a limiting hole. The pusher portion passes through the limiting hole, and its swing amplitude is limited by the limiting hole.

[0008] To enable the pusher to move along with the tool holder, the first and second tool holders are provided with lateral slots for the pusher to extend into and move along with the first or second tool holder. Furthermore, the lateral slots facilitate the pusher's movement into or out of the slots during repositioning.

[0009] To facilitate switching the state of the push button assembly so that the push button assembly can selectively move the tool holder, the switching structure includes a switching execution unit. This switching execution unit applies force to the push member, forcing the push member to swing to switch positions. Therefore, the position is switched by causing the push member to swing through the action of the switching execution unit.

[0010] In one embodiment, the switching actuation unit is a linkage located within a housing. A first end of the linkage is connected to a pusher, and a second end of the linkage is configured to move along a track within the housing, causing the linkage to swing along with the pusher. The swinging of the linkage causes the pusher to swing and change position.

[0011] In particular, for ease of operation, the second end of the connecting rod is moved along the track by the push button assembly. In this way, the oscillating position of the pusher can be achieved by operating the push button assembly.

[0012] To differentiate the action of switching the pusher from the action of moving the tool holder forward, and to avoid misoperation, a first elastic element is provided inside the housing. This first elastic element applies a forward elastic force to the first and second tool holders. When the push button assembly causes the second end of the connecting rod to move backward along the track, it overcomes the elastic force of the first elastic element. Therefore, the action of switching the pusher is achieved by controlling the backward movement of the push button assembly and its self-resetting. Specifically, to avoid increasing the radial dimension of the housing and making it difficult to grip due to an excessively large radial dimension, the first elastic element is a helical compression spring located behind the first and second tool holders. This helical compression spring is sleeved on a rod, which applies a forward elastic force to the first and second tool holders.

[0013] To control the swing of the connecting rod, the track is a stepped groove, which includes a connected first V-shaped groove segment and a second V-shaped groove segment. The movement of the second end of the connecting rod within the first and second V-shaped groove segments causes the connecting rod to swing in the opposite direction with the pusher. The second end of the connecting rod moves unidirectionally within the connected first and second V-shaped groove segments to avoid erratic movements. Accordingly, by moving the push button assembly backward, the pusher can be moved from left to right or from right to left.

[0014] In order to ensure that the second end of the connecting rod moves smoothly along the track, the second end of the connecting rod moves in conjunction with the stepped groove via rollers.

[0015] For ease of manufacturing and assembly, the track is mounted on a track frame, which is fixed inside the housing.

[0016] In one embodiment, the switching execution unit is a torque application part that swings a pusher member, and this torque application part protrudes from the push button assembly and is operable. Accordingly, the torque application part can be directly rotated to apply torque to the pusher member, causing the pusher member to swing and change position, resulting in a simple and reliable structure.

[0017] In one embodiment, the switching execution unit includes a second elastic element and a push rod assembly. The elastic force of the second elastic element acts on the pusher, causing the pusher to deflect towards the first tool holder. The push rod assembly can be switched to a first length or a second length. When the push rod assembly is switched to the first length, it overcomes the elastic force of the second elastic element and pushes the pusher from the lateral slot of the first tool holder to the lateral slot of the second tool holder. When the push rod assembly is switched to the second length, it makes way for the pusher to return to its original position from the lateral slot of the second tool holder to the lateral slot of the first tool holder. Accordingly, the pusher can be swung from one tool holder to another by moving the push button assembly, and the pusher can be reset by the second elastic element, making the operation simple and convenient.

[0018] Preferably, the push rod assembly includes a first rod, a second rod, a shifting member, a kit, a thrust spring member, and a holding spring member. The first rod is fixed and its front end has a first bearing tooth surface distributed forward along the circumference. The inner wall of the kit has a second bearing tooth surface distributed forward along the circumference. The rear end of the shifting member has a rotating shifting ramp distributed backward along the circumference. The rear end of the kit is fitted onto the first rod and maintains a forward and backward movement engagement with the first rod. The front end of the kit is fitted onto the second rod and maintains a forward and backward movement engagement with the second rod. The shifting member is located within the kit and between the first and second rods. Between these components, the shifting member is configured to move along the anti-rotation stroke within the assembly and move and rotate outside the anti-rotation stroke. The thrust spring applies a forward spring force to the assembly, and the holding spring applies a backward spring force to the shifting member. After the assembly moves backward and resets, the shifting member sits on either the first or second bearing tooth surface. When the shifting member sits on the second bearing tooth surface, the first rod extends a longer length from the assembly to push the pusher member to shift position; when the shifting member sits on the first bearing tooth surface, the first rod extends a shorter length from the assembly to allow the pusher member to reset. Accordingly, by moving the assembly backward, the shifting member is shifted to achieve the switching of the length of the pusher assembly, ultimately achieving either pushing the pusher member to shift position or allowing the pusher member to reset.

[0019] In particular, the inner wall of the kit features guide grooves extending circumferentially, spaced apart from the second bearing tooth surface; a first guide rib extending circumferentially, located within the guide groove; and a second guide rib extending circumferentially, with a rotating shifting surface on its rear end face. The second guide rib, located within the guide groove, defines an anti-rotation stroke. When the kit is pressed to move backward to the anti-rotation stroke, the first bearing tooth surface pushes the shifting component, causing the second guide rib to disengage from the guide groove, and the shifting component moves from the first bearing tooth surface to the second bearing tooth surface, or the first bearing tooth surface pushes the shifting component away from the second bearing tooth surface and onto the first bearing tooth surface. Thus, the shifting of the shifting component is achieved through the interaction of the rotating shifting surface with the first and second bearing tooth surfaces.

[0020] To avoid increasing the radial dimension of the housing and making it difficult to grip due to an excessively large radial dimension, the push rod assembly is located behind the first and second tool holders. The kit includes a round tube and a square box. The square box is connected to the front end of the round tube and supported at the rear end of the first and second tool holders for applying a rearward thrust to the kit by the first and second tool holders.

[0021] To position the tool holder appropriately, such as when the blade is housed within the housing or when the blade extends beyond the housing, the first and second tool holders are equipped with movable positioning elements. A third elastic element acts on these positioning elements, applying a spring force biased towards the positioning position. The push button assembly includes a pressing element; pressing the pressing element overcomes the spring force of the third elastic element, causing the pushing element to push the positioning element away from the positioning position. Therefore, positioning or depositioning of the tool holder is achieved by operating the pressing element of the push button assembly.

[0022] In order for the pressing member to move with the push button assembly, the push button assembly includes a seat that moves back and forth along the housing, and the pressing member is connected to the push member and is disposed on the seat in a way that moves up and down.

[0023] To coordinate with the positioning component, a fourth elastic element acts on the pressing component, applying an upward elastic force to the pressing component. This ensures the positioning component holds the tool holder in its natural position, preventing accidental movement of the tool holder.

[0024] In order to selectively push the tool post to select the blade, the first tool post and the second tool post can be simultaneously positioned with the blade retracted into the housing. The switching structure is configured to switch the state of the push button assembly when the first tool post and the second tool post are simultaneously positioned with the blade retracted into the housing.

[0025] To differentiate between the action of switching the pusher and the action of moving the tool post forward, and to avoid misoperation, the first and second tool posts are configured with a backward travel stroke when simultaneously positioned with the blade retracted into the housing. Furthermore, for ease of operation, a push button assembly pushes the first and second tool posts backward during this backward travel stroke.

[0026] When switching the pusher to swing and reposition, to prevent the tool holder from moving forward, a stop structure is provided during the backward movement to prevent the pressing member from moving downward. Accordingly, the tool holder is positioned during the backward movement, thus preventing it from being released from its position.

[0027] In order to position the tool holder in different positions, the housing or the component fixedly configured with the housing has at least two positioning slots for each tool holder, and the positioning element is positioned by inserting a tongue into the positioning slot.

[0028] To replace the blade, both the first and second tool posts are equipped with detachable blades. The housing is provided with a tool changing mechanism, which is configured to remove the blade when either the first or second tool post is positioned at the position where the blade extends out of the housing.

[0029] Specifically, a blade is inserted into the slit of each tool holder to limit its movement. The blade has a locking slot. A locking element is mounted on the side of each tool holder via a pin. The locking element has a locking tongue, which engages with the locking slot to position the blade on each tool holder. The tool changing mechanism is movably mounted on the housing. Moving the tool changing mechanism toward the locking element forces the locking element to swing around the pin, causing the locking tongue to disengage from the locking slot. This allows the blade to be removed and a new blade to be installed.

[0030] The tool changing mechanism is located in front of the locking member. The tool changing mechanism has a side-pushing part, and the locking member has a force-receiving part. The side-pushing part and the force-receiving part are engaged by an inclined surface. Therefore, tool changing can be achieved by moving the tool changing mechanism.

[0031] To simplify the structure, the tool changing mechanism is located on the spine of the housing, and each tool holder's locking mechanism is equipped with a side pusher for tool changing. Therefore, all tool holders can share a single tool changing mechanism.

[0032] Preferably, the first and second tool holders are symmetrically arranged side-by-side. This facilitates the configuration of a switching structure to change the state of the push button assembly.

[0033] This invention features a first and second tool holder arranged side-by-side within a housing, with a push button assembly moving the tool holder back and forth within the housing. A switching structure is also provided to switch the state of the push button assembly, allowing it to selectively move the tool holder. Therefore, by switching the state of the push button assembly via the switching structure, and allowing it to selectively move the tool holder, the desired blade can be extended from the housing for use.

[0034] This invention allows for the installation of different blades on different tool holders for selection, or the installation of the same blade to switch to another blade when one blade is worn or damaged, without the need to immediately replace the worn or damaged blade.

[0035] This practical knife design allows users to choose between two blades with just one tool, avoiding the hassle of carrying two separate tools and saving on operating costs.

[0036] This practical knife design allows for the mounting of identical blades on the blade holder, extending continuous working time, reducing blade replacement time, and improving work efficiency. Attached Figure Description

[0037] Figure 1 This is an isometric view of the interchangeable blade utility knife of Embodiment 1 of the present invention; Figure 2 for Figure 1 The diagram shows a practical knife with a protruding blade. Figure 3 for Figure 2 The diagram shows a practical knife removing the first housing. Figure 4 This is an exploded view of the structure of the practical knife in Embodiment 1 of the present invention; Figure 5 for Figure 4 A schematic diagram of the structure shown from another perspective; Figure 6 This is a schematic diagram of the first tool holder in Embodiment 1 of the present invention; Figure 7 for Figure 6 A schematic diagram of the structure shown from another perspective; Figure 8 for Figure 6 The diagram shows an exploded view of the first tool holder. Figure 9 for Figure 8 A schematic diagram of the structure shown from another perspective; Figure 10 This is a schematic diagram showing the correspondence between the tool changing structure and the locking component in Embodiment 1 of the present invention; Figure 11 This is a schematic diagram of the tool changing structure acting on the locking component in Embodiment 1 of the present invention; Figure 12 This is a schematic diagram showing the cooperation relationship between the pusher, connecting rod, and track in Embodiment 1 of the present invention; Figure 13 for Figure 12 An exploded view of the structure shown; Figure 14 This is a schematic diagram of the push button assembly according to Embodiment 1 of the present invention; Figure 15 for Figure 14 A schematic diagram of the structure shown from another perspective; Figure 16 for Figure 14 The diagram shows an exploded view of the push button assembly. Figure 17 for Figure 16 A schematic diagram of the structure shown from another perspective; Figure 18 This is an isometric view of the interchangeable blade utility knife of Embodiment 2 of the present invention; Figure 19 This is a schematic diagram of the removal of the first housing of the switchable blade utility knife according to Embodiment 3 of the present invention; Figure 20 This is a schematic diagram showing the positional relationship between the first tool holder, the second tool holder, and the push rod assembly in Embodiment 3 of the present invention; Figure 21 for Figure 20 An exploded view of the structure shown; Figure 22 This is an exploded view of the push rod assembly in Embodiment 3 of the present invention; Figure 23 for Figure 22 A schematic diagram of the structure shown from another perspective; Figure 24 This is an exploded view of the push button assembly in Embodiment 3 of the present invention; Figure 25 This is a schematic diagram of the pusher being pushed to the first tool holder by the elastic force of the second elastic member in Embodiment 3 of the present invention; Figure 26 This is a schematic diagram of the pusher being pushed to the second tool holder by the push rod assembly in Embodiment 3 of the present invention; Explanation of the labels in the diagram: 100 Housing; 101 Backbone; 102 Rail; 103 First Elastic Component; 104 Rod; 105 First V-groove Section; 106 Second V-groove Section; 107 Rail Frame; 108 Stopping Structure; 109 First Positioning Groove; 110 Tool Changer Structure; 111 Side Push Part; 112 First Housing; 113 Second Housing; 114 Second Positioning Groove; 115 Moving Component; 116 Fifth Elastic Component; 117 Control Button 200 First tool holder; 201 Side groove; 202 Positioning component; 203 Third elastic component; 204 Tongue; 205 Pin; 206 Locking component; 207 Locking tongue; 208 Force-bearing part; 209 Frame; 210 Cover plate; 211 Slot; 212 Slider; 213 Force-bearing component; 215 Protrusion. 300 Second Tool Holder; 400 First Blade: 401 Locking Edge 500 Second Blade; 600 Push Button Assembly: 601 Push Actuator, 602 Base, 603 Round Hole, 604 Cylindrical Column, 605 Push Part, 606 Bottom Cover, 607 Limiting Hole, 608 Pressing Component, 609 Fourth Elastic Component, 610 Slot, 611 Square Hole, 612 Recess, 613 Square Column 700 Switching Structure: 701 Connecting rod, 702 Roller, 703 Torque application part, 704 Second elastic element, 705 Push rod assembly, 706 First rod, 707 Second rod, 708 Transposition element, 709 Kit, 710 Thrust elastic element, 711 Pressing elastic element, 712 First bearing tooth surface, 713 Second bearing tooth surface, 714 Rotational transposition inclined surface, 715 Guide groove, 716 First guide rib, 717 Second guide rib, 718 Round tube, 719 Square box, 720 Bayonet, 721 First box body, 722 Second box body. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0039] The terms “comprising” and “having”, and any variations thereof, used in the specification and claims of this invention are intended to cover a non-exclusive inclusion, such as a method or product that includes a series of technical features, not necessarily limited to those technical features explicitly listed, but may also include other technical features that may be included in the method or product but not explicitly listed.

[0040] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. "Upper" and "lower," "left" and "right," and "front" and "rear" are opposite directions.

[0041] In the description of this invention, it should be understood that the technical features defined by terms such as "first" and "second" which have a sequential concept are only used to clearly describe the defined technical features and to clearly distinguish the defined technical features from other technical features, and do not represent that they are named in this way in actual implementation. Therefore, they should not be construed as limitations on this invention.

[0042] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings.

[0043] Example 1 like Figure 1-17 As shown, the switchable blade utility knife includes a housing 100, a first blade holder 200, a second blade holder 300, a push button assembly 600, and a switching structure 700.

[0044] The housing includes a first housing 112, a second housing 113, a first elastic member 103, a rod 104, and a tool changing structure 110. The first housing 112 and the second housing 113 are joined and fastened from left to right, forming an accommodating space within the housing. The housing serves as the assembly base for the first tool holder 200, the second tool holder 300, the push button assembly 600, the switching structure 700, the first elastic member 103, the rod 104, and the tool changing structure 110. The first housing and the second housing each have a protruding rib extending in a front-to-back direction on their spines.

[0045] like Figure 6-9As shown, the first tool holder 200 includes a frame 209, a cover plate 210, a positioning member 202, and a locking member 206. The frame 209 and the cover plate 210 are fastened together, forming a slit between them. The left side of the frame 209 has a slot 211 in the vertical direction, and the right side of the frame 209 has a lateral groove 201 facing to the right. The slot and the lateral groove communicate at the bottom. The positioning member 202 is fitted into the slot 211 and constrained to move only vertically. To facilitate assembly and constrain the positioning member to the frame without detaching it from the frame, the positioning member 202 is fixedly assembled by a slider 212 and a force-bearing member 213, and the force-bearing member extends to the bottom of the lateral groove. The top of the slider 212 has a tongue 204, and the bottom of the force-bearing member 213 is subjected to an upward elastic force by a third elastic member 203. Therefore, pressing the force-bearing member downward from the lateral groove can force the positioning member to move downward. The locking element 206 is mounted on the left side of the frame 209 via a pin 205, allowing it to swing around the pin. The locking element 206 has a locking tongue 207 that extends to the right, passing through the frame and into a slit. The locking element 206 has a force-bearing portion 208 that extends to a notch 214 on the right side of the first tool holder 200, located on the cover plate 210. The force-bearing portion 208 is used to push the locking element open to the left when force is applied. The top of the rear end of the first tool holder 200 has a protrusion 215, which is pushed by the seat 602 of the push button assembly, causing the first tool holder to move backward.

[0046] The first blade 400 has a locking slot 401. The first blade is inserted into the first slit, and the locking tongue 207 engages with the locking slot 4010 to position and lock the first blade onto the first tool holder. To reliably position and lock the first blade onto the first tool holder by the locking tongue, a magnetic attraction structure is provided on the first frame and the first locking member to attract the first locking member onto the first frame. Alternatively, an elastic element can be provided between the first housing and the first locking member, relying on the elastic force of the elastic element to push the first locking member against the first frame.

[0047] The second tool holder 300 is parallel to the first tool holder and has a structure that is symmetrical to the first tool holder from left to right, which will not be described in detail here.

[0048] The second blade 500 is mounted on the second tool holder 300. In the diagram, the first and second blades have different shapes, allowing them to be used for different tasks. In practical application, the first and second blades can be of the same shape to extend the continuous working time by using both blades consecutively.

[0049] The first and second tool holders are placed side by side and symmetrically on slides inside the housing, allowing them to move back and forth within the housing.

[0050] The push button assembly 600 protrudes from the housing and is used to move the knife holder back and forth within the housing. In this embodiment, the push button assembly 600 includes a base 602, a pusher 601, a bottom cover 606, a presser 608, and a fourth elastic member 609.

[0051] The base 602 has slots 610 on both its left and right sides. The first housing 112 and the second housing 113 are respectively engaged in the slots on the left and right sides of the base, allowing the base to move back and forth along the spine of the housing. In the assembled state, the base 602 is located in front of the protrusion 215, used to push the protrusion backward and move the first tool holder backward. The base 602 has a communicating circular hole 603 and a square hole 611. The square hole 611 is located above the circular hole 603. The pusher 601 has a cylinder 604 and a pusher portion 605 eccentrically located on the cylinder, the pusher portion extending downward in a rod shape. The cylinder 604 is located in the circular hole 603, allowing the pusher to be rotatably mounted on the base. The bottom cover 606 is fixed to the bottom of the base 602 and constrains the cylinder 604 within the circular hole, allowing the cylinder to rotate and move up and down appropriately within the circular hole. The bottom cover has an arc-shaped limiting hole 607. The pusher 605 extends through the limiting hole 607 of the bottom cover into the lateral groove 201 of the first tool holder or the lateral groove of the second tool holder. The pusher 605 is located on the upper side of the corresponding force-bearing member 213 to hold the force-bearing member. Moreover, the pusher 605 is inserted into the limiting hole 607 and its swing amplitude is limited by the limiting hole. The limitation of the limiting hole allows the pusher 605 to swing selectively to either the first tool holder or the second tool holder. The middle part of the seat 602 has a recess 612, and the pressing member 608 is located in the recess 612. The square post 613 of the pressing member is inserted into the square hole 611 of the seat 602 and is rotatably connected to the cylinder 604 of the pusher 601. Therefore, the pusher can both rotate and move vertically. A fourth elastic element 609 is fitted on the square column. The fourth elastic element is a spiral compression spring with its two ends supported on the seat and the pressing element, respectively. The fourth elastic element applies an upward elastic force to the pressing element.

[0052] The switching structure 700 is used to switch the state of the push button assembly 600 so that the push button assembly can selectively move the tool holder. The switching structure includes a switching execution unit that applies force to the push member, forcing the push member to swing to switch positions. In this embodiment, the switching execution unit is a connecting rod 701 located inside the housing. The connecting rod 701, the push member 601, and the square post 613 of the pressing member are coaxially assembled. Preferably, the connecting rod 701 is connected to the square post of the pressing member by a screw passing through a through hole on the connecting rod and the push member. The connecting rod and the push member rotate about the screw as an axis. The first end of the connecting rod 701 is engaged with the push part 605 of the push member through a latch 720 so that the push part moves back and forth with the connecting rod. The second end of the connecting rod is configured to move along a track 102 located inside the housing, and this movement causes the connecting rod to swing with the push member. Specifically, the track 102 is provided on a track frame 107, which is fixed between the first housing 112 and the second housing 113 and located inside the housing. The track 102 is a stepped groove, and the second end of the connecting rod 701 moves in engagement with the stepped groove via a roller 702. The stepped groove includes a first V-shaped groove section 105 and a second V-shaped groove section 106 connected together. The movement of the roller within the first and second V-shaped groove sections causes the connecting rod to swing in opposite directions with the pushing member. The roller moves unidirectionally within the connected first and second V-shaped groove sections; this unidirectional movement... Figure 12 The arrowheads are indicated by dashed lines. To cooperate with the push button assembly, a first elastic element 103 is provided inside the housing. The first elastic element is a helical compression spring located behind the first and second tool holders. The helical compression spring is sleeved on a rod 104 and applies a forward elastic force to the tool holder through the rod.

[0053] Using the structure of switching structures, such as Figure 12 As shown, when the push button assembly 600 moves backward, the first tool holder 200 and the second tool holder 300 overcome the elastic force of the first elastic member 103, and the pushing part applies a backward pushing force to the first end of the connecting rod 701, forcing the roller 702 at the second end of the connecting rod 701 to move from the right end of the first V-groove section 105 to the left rear until it reaches the corner of the first V-groove section; then the push button assembly is released, and the elastic force of the first elastic member 103 forces the push button assembly 600 to reset through the first tool holder and the second tool holder and pulls the connecting rod forward, forcing the roller 702 at the second end of the connecting rod to move from the corner of the first V-groove section 105 to the left front until the roller leaves the first V-groove section. The process of the roller 702 moving in the first V-groove section is generally a process of moving from right to left, thereby causing the connecting rod to swing accordingly, and the pushing part 605 swings from left to right, realizing the displacement of the pushing part from the first lateral groove to the second lateral groove.

[0054] Following the aforementioned action, the push button assembly 600 is moved backward. Overcoming the elastic force of the first elastic member via the first and second tool holders, the push abutment 605 applies a backward thrust to the first end of the connecting rod, forcing the roller at the second end of the connecting rod to move from the left end of the second V-groove section 106 to the right rear until it reaches the corner of the second V-groove section. Then, the push button assembly is released. The elastic force of the first elastic member, via the first and second tool holders, forces the push button assembly to reset and pulls the connecting rod forward, forcing the roller at the second end of the connecting rod to move from the corner of the second V-groove section to the right front until the roller leaves the second V-groove section. The movement of the roller within the second V-groove section is generally from left to right, causing the connecting rod to swing accordingly. The push abutment 605 swings from right to left, realizing the shift of the push abutment from the second lateral groove to the first lateral groove.

[0055] Roller 702 Figure 12 As shown, during movement within the first V-groove section 105 and the second V-groove section 106, the roller is not obstructed by the steps and can therefore move smoothly. Conversely, the roller intends to move according to... Figure 12 When moving in the opposite direction of the arrow shown, the roller will be blocked by the step and cannot move. This causes the roller to move unidirectionally within the track. In other embodiments, the direction of unidirectional movement of the roller within the track can be set by configuring the direction of the step in the stepped groove.

[0056] As described above, the push button assembly can be moved backward once and then reset forward to achieve the repositioning of the push button part, making the operation convenient.

[0057] In use, to position the blade, a first positioning groove 109 and a second positioning groove 114 are provided on the track frame 107. The width of the first positioning groove 109 is approximately the same as the width of the tongue 204. The tongue extends into the first positioning groove by the elastic force of the third elastic member to achieve positioning and prevent the first tool holder from moving back and forth. The width of the second positioning groove 114 is greater than the width of the tongue 204. When the tongue 204 extends into the first positioning groove, the elastic force of the first elastic member causes the tongue to rest against the front end of the second positioning groove, providing a backward stroke for the push button assembly to move backward to switch the position of the push part. The first tool holder 200 is positioned in the first positioning groove to extend the first blade 400 out of the housing, and the first tool holder is positioned in the second positioning groove to retract the first blade into the housing.

[0058] Pressing the push button assembly's pressing member 608 overcomes the elasticity of the third and fourth elastic members. The pressing member 608 presses down on the push member 601, causing it to move downwards. The push part 605 of the push member forces the positioning member 202 to move downwards and leave the positioning position, thereby allowing the tongue to exit the first or second positioning groove. The push button assembly can then move the first tool holder back and forth.

[0059] As described above, the first and second tool posts can be simultaneously positioned with the blades retracted into the housing. Furthermore, the switching mechanism is configured to switch the state of the push button assembly when the first and second tool posts are simultaneously positioned with the blades retracted into the housing, allowing the push button assembly to selectively move one of the tool posts. Moreover, when the first and second tool posts are simultaneously positioned with the blades retracted into the housing, they are configured with a backward travel stroke, provided by the second positioning groove. The push button assembly pushes the first and second tool posts backward during this backward travel stroke, and the push button assembly, along with the first and second tool posts, returns to their original positions due to the elasticity of the first spring member.

[0060] The raised ribs on the back of the first and second housings act as a stop structure 108 corresponding to the backward stroke, during which the raised ribs prevent the pressing member from moving downward and thus avoid releasing the positioning of the tool holder.

[0061] The tool changing mechanism 110 is configured to disassemble the blade when one of the first and second tool holders is selectively positioned in the blade extension position from the housing. In this embodiment, the tool changing mechanism is located in front of the locking member. The tool changing mechanism 110 includes a movable member 115 and a fifth elastic member 116. The movable member 115 is movably mounted to the front end of the back of the housing. The movable member has a control button 117 exposed outside the housing. The bottom surface of the control button 117 has a downwardly projecting triangular protrusion. The apex of the triangular protrusion points rearward. The two sides of the triangular protrusion are symmetrically arranged as side pushers 111. The side pushers 111 engage with the force-receiving part 208 at an angle. The fifth elastic member applies a forward elastic force to the movable member. When the first blade holder 200 is positioned in the first positioning groove and the first blade extends out of the housing, the thumb controls the control knob 117 to push the moving part backward, overcoming the elastic force of the fifth elastic member 116. The side push part 111 acts on the force receiving part 208, forcing the locking member 206 to swing to the left around the pin axis, causing the locking tongue 207 to disengage from the locking port 401, allowing the first blade to be pulled out and a new blade to be installed. Afterward, releasing the control knob causes the elastic force of the fifth elastic member to reset the moving part, and the locking member resets accordingly, locking the blade.

[0062] Since the two sides of the triangular protrusion are symmetrical and serve as side pushers, the corresponding locking mechanism can be pushed open to replace the blade, regardless of whether the first blade or the second blade extends out of the housing.

[0063] In this embodiment, since the second tool post is parallel to the first tool post and has a structure that is symmetrical to the first tool post, the cooperation between the push button assembly, the tool changing structure and the second tool post is the same as their cooperation with the first tool post, and will not be described in detail.

[0064] In this embodiment, a flip-out blade storage rack is installed inside the housing, which stores spare blades for easy access when a blade needs to be replaced.

[0065] Example 2 like Figure 18 As shown, the difference between this switchable blade utility knife and the embodiment lies in the different switching execution unit and the different position of the positioning slot.

[0066] First, in this embodiment, the switching execution unit is a torque application part 703 with a swinging pusher. This torque application part 703 is integrated with the pressing member 608 and protrudes from the push button assembly like a knob for operation. Therefore, by rotating the torque application part, the pusher of the pusher can be repositioned.

[0067] Secondly, in this embodiment, in order to position the tool holder, the first positioning groove and the second positioning groove are provided in the first housing and the second housing.

[0068] The remaining mechanisms are the same as in Example 1, and will not be described in detail.

[0069] Example 3 like Figure 19-26 As shown, the difference between this switchable blade utility knife and the embodiment lies in the different switching execution unit and the different position of the positioning slot.

[0070] First, in this embodiment, the switching execution unit includes a second elastic member 704 and a push rod assembly 705. The elastic force of the second elastic member 704 acts on the push member 701, causing the push portion of the push member to deflect towards the lateral groove of the first tool holder. The second elastic member 704 is a torsion spring located inside the seat and limited within the seat by the bottom cover. One end of the torsion spring is inserted and positioned on the push member 601, and the other end of the torsion spring is inserted and positioned on the seat 602.

[0071] The push rod assembly 705 can be switched to a first length or a second length, with the first length being greater than the second length. When the push rod assembly is switched to the first length, it overcomes the elastic force of the second elastic member 704 and pushes the pushing part of the pusher member from the side groove of the first tool holder to the side groove of the second tool holder. When the push rod assembly is switched to the second length, the pushing part of the pusher member is reset to the side groove of the first tool holder from the side groove of the second tool holder.

[0072] Specifically, the push rod assembly 705 includes a first rod 706, a second rod 707, a shifting member 708, a kit 709, a thrust spring member 710, and a holding spring member 711. The inner wall of the kit 709 has guide grooves 715 extending forward and backward along the circumference, and a forward-facing second bearing tooth surface 713, with the guide grooves and the second bearing tooth surface spaced apart. The rear end of the first rod 706 is fixed to the housing, and the front end of the first rod 706 has a forward-facing first bearing tooth surface 712 distributed along the circumference. The first rod 706 also has a first guide rib 716 extending forward and backward along the circumference, located within the guide groove 715. The shifting member 708 has a second guide rib 717 extending forward and backward along the circumference, with a rotational shifting inclined surface 714 on its rear end face. The rear end of the kit 709 is fitted onto the first rod 706, and the first guide rib 716, located within the guide groove 715, allows the kit to maintain a forward and backward movement engagement with the first rod. The front end of the kit 709 is fitted onto the second rod 707, which is a square column and mates with the square hole of the kit, allowing the second rod to maintain a back-and-forth movement with the kit. The shifting member 708 is located within the kit and between the first rod 706 and the second rod 707. Furthermore, when the second guide rib 717 is located in the guide groove 715, an angular difference is maintained between the first bearing tooth surface 713 and the rotational shifting inclined surface 714, allowing the rotational shifting inclined surface to sit on the first bearing tooth surface but not to completely mate with it. The shifting member 708 is configured to move along the anti-rotation stroke within the kit and move and rotate outside the anti-rotation stroke. The second guide rib, located within the guide groove, defines the anti-rotation stroke. When the pressing assembly 709 moves backward to its anti-rotation stroke, the first bearing tooth surface 712 pushes the shifting member, causing the second guide rib 717 to disengage from the guide groove 715, and the shifting member 708 shifts from the first bearing tooth surface 712 to the second bearing tooth surface 713, or the first bearing tooth surface pushes the shifting member away from the second bearing tooth surface and shifts it to the first bearing tooth surface. The thrust spring member 710, fitted on the first rod, applies a forward spring force to the assembly. The holding spring member 711, located inside the assembly and fitted on the second rod, applies a backward spring force to the shifting member through the second rod. After the assembly 709 moves backward and resets, the shifting member sits on the first bearing tooth surface or the second bearing tooth surface. When the shifting member sits on the second bearing tooth surface, the first rod extends a longer length from the assembly to push the pusher member to shift; when the shifting member sits on the first bearing tooth surface, the first rod extends a shorter length from the assembly to allow the pusher member to reset and move.

[0073] The push rod assembly 705 is located behind the first and second tool holders. The kit 709 includes a round tube 718 and a square box 719. The square box includes a first box body 721 and a second box body 722. The first box body, the second box body, and the front end of the round tube are engaged with each other. The square hole of the kit is formed at the front end of the square box. The square box is pressed against the rear end of the first and second tool holders by the elastic force of the thrust spring member 710, so that the first and second tool holders can apply a rearward thrust to the kit.

[0074] Based on the structure of the switching execution unit described above, when the two tool holders are positioned in the second positioning slot, the position of the pushing part can be changed by moving the push button assembly and the two tool holders backward.

[0075] Pushing part 605 is located Figure 25 In the state shown, the pushing part is located in the side groove of the first tool holder, the second rod 707 extends forward by a short length, and the second rod 707 and the pushing part 605 maintain a distance in the front-back direction. At this time, the shifting member 708 sits on the first bearing tooth surface 712, and the rotation shifting inclined surface 714 of the shifting member is not completely seated on the first bearing tooth surface 712.

[0076] since Figure 25 In the indicated state, pushing the push button assembly 600 backward causes the two tool holders to move backward, which in turn pushes the kit 709 backward. This is equivalent to the shifting member 708 moving towards the front end of the kit within the kit 709, until the second guide rib 717 disengages from the guide groove 715. At this point, under the elastic force of the holding spring member 711, the shifting member 708 is forced to move backward a small distance and rotate by an angle difference, causing the rotating shifting inclined surface 714 of the shifting member to fully sit on the first bearing tooth surface 712. The rotating shifting inclined surface 714 is located in front of and corresponds to the second bearing tooth surface 713, and the second guide rib 717 deviates from the guide groove 715. Next, releasing the push button assembly 600 causes the kit 709, the two tool holders, and the push button assembly 600 to move forward and reset under the elastic force of the pushing spring member 710. During the forward movement and resetting process of the assembly, the shifting member 708, which is seated on the first bearing tooth surface, moves towards the rear end of the assembly within the assembly 709. The rotating shifting ramp 714 of the shifting member fully sits on the second bearing tooth surface 713 until the assembly is fully reset under the elastic force of the thrusting spring member. At this point, the first rod 707 extends a considerable length from the assembly, pushing the pushing part 605 of the pushing member to shift to... Figure 26 In the state shown, the pusher 605 is located in the side groove of the second tool holder, and the push button assembly can move the second tool holder back and forth.

[0077] The push-off part is located in Figure 26 In the state shown, the second rod 707 extends to a longer length and is located on the left side of the pushing part. At this time, the second guide rib 717 disengages from the guide groove 715, and the rotational displacement inclined surface 714 of the displacement member is fully seated on the second bearing tooth surface 713.

[0078] since Figure 26In the indicated state, pushing the push button assembly 600 backward causes the two tool holders to move backward, which in turn pushes the assembly 709 backward. Under the elastic force of the holding spring member 711, the second rod 707 and the shifting member 708 move backward with the assembly 709, while the first rod 706 moves towards the front end of the assembly 709 within the assembly until the first bearing tooth surface 712 pushes the rotating shifting ramp 714 away from the second bearing tooth surface 713. During the process of the first bearing tooth surface pushing the rotating shifting ramp away from the second bearing tooth surface, due to the angle difference between the first bearing tooth surface and the rotating shifting ramp, under the elastic force of the holding spring member 711, the shifting member 708 moves backward a small distance and rotates the angle difference, causing the rotating shifting ramp 714 of the shifting member 708 to completely sit on the first bearing tooth surface 712. After the rotating transposition ramp of the transposition component is fully seated on the first bearing tooth surface, it rotates by an angular difference relative to the second bearing tooth surface, and the second guide rib 717 corresponds to the guide groove 715. Next, the push button assembly 600 is released, and under the elastic force of the push spring component 710, the kit 709, the two tool holders, and the push button assembly 600 move forward to reset. During the forward resetting process, the second guide rib 717 enters the guide groove 715 and rotates by an angular difference. The rotating transposition ramp 714, seated on the first bearing tooth surface 712, creates an angular difference with the first bearing tooth surface. Guided by the second guide rib and the guide groove, the first bearing tooth surface 712 and the rotating transposition ramp 714 move towards the rear end of the kit until the kit 709 is fully reset under the elastic force of the push spring component 710. At this point, the first rod 707 extends a short length from the assembly 709, and the second rod 707 maintains a distance from the pushing part 605 in the front-back direction. Under the elastic force of the second elastic member 704, the pushing part 605 of the pushing member extends from... Figure 26 The state shown is reset to Figure 25 In the state shown, the pusher part is reset from the side slot of the second tool post to the side slot of the first tool post, and the push button assembly can move the first tool post back and forth.

[0079] Secondly, in this embodiment, in order to position the tool holder, the first positioning groove and the second positioning groove are provided in the first housing and the second housing.

[0080] The remaining mechanisms are the same as in Example 1, and will not be described in detail.

Claims

1. A utility knife with interchangeable blades, characterized by: include: Casing (100); A first tool holder (200) and a second tool holder (300) are mounted side by side in the housing, which are movable back and forth, and each tool holder is equipped with a cutting blade; A push button assembly (600) protrudes from the housing for selectively moving either the first or second tool holder back and forth within the housing; A switching structure (700) is configured to switch the state of the push button assembly so that the push button assembly can selectively move either the first tool post or the second tool post. The push button assembly (600) is located on the spine (101) of the housing. The push button assembly includes a pusher (601) extending toward the first tool post or the second tool post, the pusher being oscillatingly configured to oscillate to either the first tool post or the second tool post. The push button assembly includes a seat (602) that moves back and forth along the housing, and a pusher (601) is rotatably configured on the seat; The base (602) has a circular hole (603), and the pusher (601) has a cylinder (604) and a pusher portion (605) eccentrically located on the cylinder. The cylinder is located in the circular hole and is constrained in the circular hole by a bottom cover (606). The pusher portion (605) extends through the bottom cover toward the first tool holder or the second tool holder. The first and second tool holders are provided with lateral grooves (201) into which the pusher extends and moves the first or second tool holder. The switching structure (700) includes a switching execution unit that applies force to the pusher (601) to force the pusher to swing and switch positions.

2. The interchangeable blade utility knife according to claim 1, characterized in that: The bottom cover (606) is provided with a limiting hole (607), and the pushing part (605) passes through the limiting hole and its swing amplitude is limited by the limiting hole.

3. The interchangeable blade utility knife according to claim 1, characterized in that: The switching actuator is a link (701) located inside the housing. The first end of the link is connected to a pusher (601), and the second end of the link is configured to move along a track (102) located inside the housing, and the movement causes the link to swing with the pusher.

4. The interchangeable blade utility knife according to claim 2, characterized in that: The second end of the connecting rod (701) moves along the track via the push button assembly (600).

5. The interchangeable blade utility knife according to claim 4, characterized in that: The housing is provided with a first elastic element (103). The first elastic element applies a forward elastic force to the first tool post and the second tool post. When the push button assembly causes the second end of the connecting rod to move backward along the track, it overcomes the elastic force of the first elastic element.

6. The interchangeable blade utility knife according to claim 5, characterized in that: The first elastic element (103) is a helical compression spring located behind the first tool post and the second tool post. The helical compression spring is sleeved on a rod (104) and applies a forward elastic force to the first tool post and the second tool post through the rod.

7. The interchangeable blade utility knife according to claim 3, characterized in that: The track (102) is a stepped groove, which includes a first V-shaped groove segment (105) and a second V-shaped groove segment (106) connected together. The movement of the second end of the connecting rod in the first V-shaped groove segment and the second V-shaped groove segment causes the connecting rod to swing in the opposite direction with the pusher. The second end of the connecting rod moves unidirectionally in the first V-shaped groove segment and the second V-shaped groove segment connected together.

8. The interchangeable blade utility knife according to claim 7, characterized in that: The second end of the connecting rod moves in conjunction with the stepped groove via a roller (702).

9. The interchangeable blade utility knife according to claim 3, characterized in that: The track is mounted on the track frame (107), which is fixed inside the housing.

10. The interchangeable blade utility knife according to claim 1, characterized in that: The switching execution unit is a torque application part (703) with a oscillating pusher, which protrudes from the push button assembly (600) and is operable.

11. The interchangeable blade utility knife according to claim 1, characterized in that: The switching execution unit includes a second elastic element (704) and a push rod assembly (705). The elastic force of the second elastic element (704) acts on the pusher (601) to cause the pusher to deflect towards the first tool holder. The push rod assembly (705) can be switched to a first length or a second length. When the push rod assembly (705) is switched to the first length, it overcomes the elastic force of the second elastic element (704) and pushes the pusher (601) from the side slot of the first tool holder to the side slot of the second tool holder. When the push rod assembly is switched to the second length, it makes room for the pusher to reset from the side slot of the second tool holder to the side slot of the first tool holder.

12. The interchangeable blade utility knife according to claim 11, characterized in that: The push rod assembly (705) includes a first rod (706), a second rod (707), a shifting member (708), a kit (709), a thrust spring (710), and a holding spring (711). The first rod (706) is fixed and its front end has a first bearing tooth surface (712) distributed circumferentially and facing forward. The inner wall of the kit has a second bearing tooth surface (713) distributed circumferentially and facing forward. The rear end of the shifting member has a rotating shifting ramp (714) distributed circumferentially and facing backward. The rear end of the kit (709) is fitted onto the first rod (706) and maintains a forward and backward movement engagement with the first rod. The front end of the kit (709) is fitted onto the second rod (707) and maintains a forward and backward movement engagement with the second rod. The shifting member (708) is located at... The kit (709) is located between the first rod (706) and the second rod (707). The shifting member is configured to move within the kit along the anti-rotation stroke and move and rotate outside the anti-rotation stroke. The thrusting spring (710) applies a forward spring force to the kit (709), and the holding spring (711) applies a backward spring force to the shifting member (708). After the kit moves backward and resets, the shifting member (708) sits on the first bearing tooth surface (712) or the second bearing tooth surface (713). When the shifting member sits on the second bearing tooth surface, the first rod extends a longer length from the kit to push the pusher to shift position. When the shifting member sits on the first bearing tooth surface, the first rod extends a shorter length from the kit to allow the pusher to reset and move.

13. The interchangeable blade utility knife according to claim 12, characterized in that: kit ( 709) Guide grooves (715) extending back and forth evenly along the circumference of the inner wall, the guide grooves (715) and the second bearing tooth surface (713) are spaced apart; the first rod (706) extends back and forth evenly along the circumference of the first guide rib (716), the first guide rib (716) is located in the guide groove (715); the shifting member extends back and forth evenly along the circumference of the second guide rib (717), the rear end face of the second guide rib is provided with a rotation shifting slope (714), the second guide rib is located in the guide groove to determine the anti-rotation stroke, when the pressing kit moves backward to the anti-rotation stroke, the first bearing tooth surface pushes the shifting member to make the second guide rib disengage from the guide groove and the shifting member shifts from the first bearing tooth surface to the second bearing tooth surface or the first bearing tooth surface pushes the shifting member away from the second bearing tooth surface and shifts to the first bearing tooth surface.

14. The interchangeable blade utility knife according to claim 12, characterized in that: The push rod assembly (705) is located on the rear side of the first tool post and the second tool post. The kit (709) includes a round tube (718) and a square box (719). The square box (719) is connected to the front end of the round tube (718) and supported at the rear end of the first tool post and the second tool post for applying a push force to the kit backward by the first tool post and the second tool post.

15. The interchangeable blade utility knife according to claim 1, characterized in that: The first and second tool holders are provided with movable positioning members (202). A third elastic member (203) acts on the positioning member and applies an elastic force biased towards the positioning position to the positioning member. The push button assembly (600) includes a pressing member (608). When the pressing member is pressed, the elastic force of the third elastic member is overcome, causing the push member (601) to push the positioning member (202) away from the positioning position.

16. The interchangeable blade utility knife according to claim 15, characterized in that: The push button assembly (600) includes a seat (602) that moves back and forth along the housing, and a pressing member (608) connected to and movable up and down on the seat.

17. The interchangeable blade utility knife according to claim 16, characterized in that: A fourth elastic element (609) acts on the pressing element (608), and the fourth elastic element applies an upward elastic force to the pressing element.

18. The interchangeable blade utility knife according to any one of claims 15-17, characterized in that: The first tool post and the second tool post can be simultaneously positioned with the blade retracted into the housing. The switching structure (700) is configured to switch the state of the push button assembly when the first tool post and the second tool post are simultaneously positioned with the blade retracted into the housing.

19. The interchangeable blade utility knife according to claim 18, characterized in that: When the first and second tool posts are simultaneously positioned with the blade retracted into the housing, a backward travel is configured for both tool posts.

20. The interchangeable blade utility knife according to claim 19, characterized in that: The first and second tool holders are pushed backward by the push button assembly (600) during the backward stroke.

21. The interchangeable blade utility knife according to claim 19, characterized in that: A stop structure (108) is configured to prevent the pressing member from moving downward during the backward stroke.

22. The interchangeable blade utility knife according to claim 18, characterized in that: Each tool holder has at least two positioning slots on the housing or a component fixedly configured with the housing, and the positioning element is positioned by inserting a tongue (204) into the positioning slot.

23. The interchangeable blade utility knife according to claim 1 or 2, characterized in that: Both the first and second tool posts are equipped with detachable blades, and the housing is provided with a tool changing structure (110). The tool changing structure is configured to remove the blade when either the first or second tool post is positioned at the position where the blade extends out of the housing.

24. The interchangeable blade utility knife according to claim 23, characterized in that: A blade is inserted into the slit of each tool holder, and the blade has a locking port (401). A locking member (206) is mounted on the side of each tool holder via a pin (205). The locking member (206) has a locking tongue (207). The locking tongue (207) is engaged with the locking port to position the blade on each tool holder. The tool changing structure (110) is movably mounted on the housing (100). Moving the tool changing structure toward the locking member forces the locking member to swing around the pin and disengage the locking tongue from the locking port.

25. The interchangeable blade utility knife according to claim 24, characterized in that: The tool changing structure (110) is located in front of the locking member (206). The tool changing structure has a side push part (111), and the locking member has a force receiving part (208). The side push part and the force receiving part are engaged by an inclined surface.

26. The interchangeable blade utility knife according to claim 25, characterized in that: The tool changing mechanism (110) is located on the back (101) of the housing and is equipped with a side pusher for changing the tool for each tool holder.

27. The interchangeable blade utility knife according to claim 1 or 2, characterized in that: The first tool holder (200) and the second tool holder (300) are symmetrical from left to right.

Images