WO2020107598A1

WO2020107598A1 - Practical knife having locking structure

Info

Publication number: WO2020107598A1
Application number: PCT/CN2018/123372
Authority: WO
Inventors: 周晓刚
Original assignee: 宁波宏迪尺业有限公司
Priority date: 2018-11-27
Filing date: 2018-12-25
Publication date: 2020-06-04

Abstract

A practical knife having a locking structure. The practical knife comprises a housing (1), a knife frame (2), a blade (3), a pushing button (4), and a knife frame locking device (5); the front end of the housing (1) is provided with a blade stretchable port (11) which can be used for stretching and retracting the blade (3), and a sliding groove which can be used for moving the pushing button (4) is provided on the side surface of the housing (1); and the blade (3) is mounted in the housing (1) by means of the knife frame (2) in a matched manner, and the blade (3) is controlled to be stretched and retracted in the blade stretchable port (11) by means of the pushing button (4); the knife frame locking device (5) achieves stretching locking the blade (3) by locking the knife frame (2). The knife frame locking device is adopted for locking the knife frame, the stretchable movement of the blade is limited, and thus the locking of the blade is achieved, and it is guaranteed that when this product is used, the blade cannot automatically stretch and retract so as to influence the cutting work.

Description

Practical knife with locking structure

Technical field

The invention belongs to the technical field of art cutters, and particularly relates to a utility knife with a locking structure.

Background technique

The utility knife is also commonly known as a carving knife or a wallpaper knife. It is a kind of knife used for fine arts and handicrafts. It is mainly used to cut softer things. It is mostly composed of a plastic knife handle and a blade. It is a pull-out structure. There are also a few metal knife handles, the blades are mostly oblique, and can be broken with a blunt line along the body. A new blade appears, which is convenient for use. Among them, the utility knife is a kind of utility knife. The push button is provided on the top. When the blade is cut downward, the thumb can be used to push the push button and at the same time it is convenient to apply downward pressure. It is also convenient to cut while controlling the blade by pushing the button. It is a very practical art cutter. However, because utility knives generally use manual control to push the button to limit the blade, there is a case where the blade cannot be stably controlled during use, which affects the cutting effect; and the assembly structure of the blade causes it to have a certain assembly gap, the blade in use There is a certain gap shaking, making ordinary utility knife not suitable for fine cutting.

Summary of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is to provide a utility knife whose blade expansion and contraction can be locked.

(2) Technical solution

In order to solve the above technical problems, the present invention provides a utility knife with a locking structure, which includes a casing, a knife holder, a blade, a push button and a knife holder locking device; The side of the casing is provided with a slide slot for pushing the button; the blade is matched and installed in the casing through the knife holder, and the blade is controlled to perform telescopic movement at the blade expansion port by pushing the button; the knife holder locking device is passed Lock the knife holder to achieve telescopic locking of the blade.

Among them, the casing includes a left casing and a right casing which are spliced and fixed on the left and right; the inner wall of the right casing is provided with a blade holder sliding groove which penetrates the blade expansion port and matches the blade holder; the top surface of the casing is provided with a through blade The sliding slot of the rack and matching the push button; the blade is fixedly clamped on the knife holder, and the knife holder carries the blade to be matched and installed on the sliding slot of the knife holder; the push button matching linkage is connected to the knife holder and slides from the button The slot is exposed outside the shell;

The knife holder locking device includes a gear lock push button matched with the button slide groove, and a linkage lock rack matched with the knife holder slide groove, and a limit protrusion is provided on the side of the gear lock push button; The casing between the button slide slot and the knife holder slide slot is provided with an unlocking tooth slot and a locking tooth slot matching the restricting protrusions, the unlocking tooth slot is distributed at the rear end of the button slide slot, and the locking tooth slot is distributed at the unlocking tooth In front of the slot, the height of the locking slot is lower than the height of the unlocking slot; a spring hole is provided in the middle of the bottom end of the gear lock push button, and a compression spring matching it is provided in the spring hole; The front end of the lock frame extends an extension plate that is higher than the knife holder, and the extension plate is provided with a through hole matching the bottom end of the gear lock push button, and the middle of the through hole is provided with a matching spring hole Pressure spring force plate; the top of the knife holder is provided with a limiting sleeve connection hole matching the bottom end of the gear lock push button;

The linkage locking bracket is matched and installed on the sliding groove of the knife holder and behind the knife holder, the gear locking push button is snapped into the unlocking tooth slot through the limiting protrusion, and the bottom end of the gear locking push button matches the sleeve It is connected to the through hole and does not penetrate the through hole under the force of the compression spring. The top of the gear lock push button is exposed outside the housing from the button slide and is behind the push button; when the push button is close to the gear lock When pushing the button, the limiting sleeve hole of the knife holder is located directly under the gear lock push button.

Wherein, the rear end of the knife holder is provided with a limiting clamping slot matched with the front end of the interlocking lock bracket.

Among them, a forceful tension spring is arranged between the linkage lock frame and the knife holder.

Among them, the utility knife with a locking structure also includes a locking device. The locking device includes a locking lever and an adjusting device. The locking device adjusts the locking lever to lock the blade through the adjusting device.

Wherein, the inner wall of the left casing is provided with inclined protrusions near the blade expansion port; the locking rod is arranged between the inner wall of the left casing and the blade, the adjusting device is arranged at the rear end of the casing; It is controlled to realize its telescopic movement toward the direction of the blade telescoping opening, and the front end of the locking lever reduces the gap with the blade and clamps the locking blade by tilting the projection.

Among them, the adjusting device includes a locking screw and a locking knob. The locking knob is provided with a threaded hole coaxial with the locking screw and matching with the locking screw; the bottom end of the housing is provided with a matching with the locking knob The knob sleeve hole; the locking knob matching sleeve is inserted into the knob sleeve hole; the front end of the locking screw is matched and fixedly connected with the rear end of the locking rod, and the rear end of the locking screw matches the thread of the threaded hole of the locking knob Connection; the locking rod realizes its telescopic movement toward the blade telescopic port through the adjustment of the threaded connection between the locking knob and the locking screw.

Among them, the blade is provided with a clamping fixing hole, and the blade holder is provided with a buckle matching with the clamping fixing hole; the blade is fixed to the blade holder through the clamping between the buckle and the clamping fixing hole connection.

Among them, the inner side wall of the left housing is also provided with a tool change button, one end of the tool change button is matched with the left housing, and the other end of the tool change button extends through the left housing and extends from the outer side of the left housing , The back structure of the end of the tool change button protruding from the left casing matches the buckle; the blade is replaced by pressing the top button to release the buckle from the fixing hole.

(3) Beneficial effects

Compared with the prior art, the present invention uses a knife holder locking device to lock the knife holder, thereby limiting the expansion and contraction of the blade, thereby achieving the locking of the blade, and ensuring that the blade will not automatically expand and contract and affect the cutting work during use of this product; Among them, a tension spring is provided between the linkage lock frame and the blade holder, which can facilitate the blade holder to carry the blade to shrink and reset, and at the same time ensure that the blade will not extend beyond the blade expansion port when not in use, effectively prevent accidental injuries and other situations, and improve safety performance. It is convenient to carry the utility knife; in addition, the set locking device adopts the structure of the locking lever to clamp the blade, so as to achieve the function of blade locking, so that there will be no gap shaking when using, eliminating the need for people to manually apply pressure to limit the blade Operation, effectively avoid the situation that the blade slides to cause cutting errors or accidentally hurt people, and improve the cutting accuracy of this product.

BRIEF DESCRIPTION

FIG. 1 is a schematic structural view of a utility knife with a lock structure of the present invention.

2 is a schematic structural view of the utility knife with a lock structure of the present invention to the right casing.

FIG. 3 is a schematic structural view of the left housing of the present invention.

4 is a schematic structural view of the utility knife with a locking structure of the present invention to the left casing.

DESCRIPTION OF REFERENCE NUMERALS: 1. Shell; 2. Knife holder; 3. Blade; 4. Push button; 5. Knife holder locking device; 6. Tension spring; 7. Locking device; 11. Blade expansion port; 12. Left housing; 13, right housing; 14, button chute; 15, unlock cogging; 16, lock cogging; 17, knob sleeve socket; 21, limit sleeve socket; 22, limit card slot; 23, buckle; 31, fixing hole for snap-in connection; 51, gear lock push button; 52, linkage lock bracket; 71, lock lever; 72, adjustment device; 121, inclined projection; 122, tool change button 123, guide projection; 131, knife holder sliding groove; 511, limit projection; 512, spring hole; 513, compression spring; 521, extension plate; 522, through hole; 523, compression spring force plate; 711, Guide slot; 721, locking screw; 722, locking knob; 7221, threaded hole.

detailed description

The specific implementation of the present invention will be further described in detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

1 is a schematic structural view of a utility knife with a locking structure of the present invention, which embodies the utility knife with a locking structure is composed of a housing 1, a knife holder 2, a blade 3, a push button 4 and a knife holder locking device 5 , And their connection relationship; Figure 2 is a schematic view of the utility knife with a locking structure of the present invention to the right shell structure, mainly reflecting the structure of the knife holder locking device 5 and the locking device 7; Figure 3 is The structural schematic diagram of the left casing of the present invention highlights the structure of the inclined projection 121, the tool change button 122, the guide projection 123, the unlocking slot 15 and the locking slot 16 on the left casing 12; FIG. 4 is the present invention The schematic diagram of the structure of the utility knife with a lock structure to the left casing, which mainly reflects the structure of the sliding groove 131 and the guide groove 711 of the knife holder.

The structure of the utility knife with a locking structure of the present invention is shown in FIG. 1. The utility knife with a locking structure includes a housing 1, a knife holder 2, a blade 3, a push button 4 and a knife holder locking device 5; the housing 1 The front end of the blade is provided with a blade expansion port 11 for the blade 3 to expand and contract. The side of the casing 1 is provided with a sliding slot for pushing the button 4 to move; the blade 3 is matched and installed in the casing 1 through the blade holder 2 and the blade 3 The push button 4 is used to control the telescopic movement of the blade telescopic opening 11; the knife holder locking device 5 realizes the telescopic locking of the blade 3 by locking the knife holder 2. The invention uses the knife holder locking device to lock the knife holder, thereby limiting the expansion and contraction movement of the blade, thereby achieving the locking of the blade, and ensuring that the blade will not automatically expand and contract during use of the product and affect the cutting work.

As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, in this embodiment, the housing 1 includes a left housing 12 and a right housing 13 that are spliced and fixed on the left and right; the inner wall of the right housing 13 is provided with a through blade telescoping A sliding groove 131 of the blade holder that matches the blade holder 2 and the opening 11; a top surface of the housing 1 is provided with a button sliding groove 14 that penetrates the blade holder sliding groove 131 and matches the push button 4; the blade 3 is fixedly engaged with the knife On the rack 2, the knife holder 2 carries the blade 3 and is matched and installed on the knife holder sliding groove 131; the push button 4 is matched and connected to the knife holder 2 and is exposed out of the housing 1 from the button slide slot 14; It is an integral connection structure with the knife holder 2, push the push button 4 to control the knife holder 2;

The knife holder locking device 5 includes a gear lock push button 51 matched with the button slide slot 14, and a linkage lock rack 52 matched with the knife carriage slide groove 131, and the side of the gear lock push button 51 The limiting protrusion 511 is provided; the housing 1 between the button slide slot 14 and the knife holder sliding slot 131 is provided with an unlocking tooth slot 15 and a locking tooth slot 16 matching the limiting protrusion 511, and the unlocking tooth slot 15 is distributed in At the rear end of the button slide slot 14, the locking slot 16 is distributed in front of the unlocking slot 15. The height of the locking slot 16 is lower than the height of the unlocking slot 15; A spring hole 512 with a corresponding compression spring 513 in the spring hole 512; an extension plate 521 above the knife holder 2 extends from the front end of the linkage lock frame 52, and the extension plate 521 is provided with a gear A through hole 522 matching the bottom end of the position-locking push button 51 is provided with a compression spring force plate 523 matching the spring hole 512 in the middle of the through hole 522; The limiting sleeve hole 21 matching the bottom end of the lock push button 51;

The interlocking locking bracket 52 is matched and installed on the knife holder sliding groove 131 and is located behind the knife holder 2, the gear locking push button 51 is locked in the unlocking tooth slot 15 through the limiting protrusion 511, and the gear locking lock is pushed The bottom end of the button 51 is matched with the through hole 522 and does not pass through the through hole 522 under the force of the compression spring 513. The top end of the gear lock push button 51 is exposed out of the housing 1 from the button slide slot 14 It is located behind the push button 4; when the push button 4 is close to the gear lock push button 51, the limiting sleeve hole 21 of the knife holder 2 is located directly under the gear lock push button 51;

When the push button 4 is close to the position lock push button 51, the lock push button 51 is pressed to overcome the compression spring 513 and penetrate the through hole 522 to be inserted into the limiting sleeve hole 21, and at the same time, the limit protrusion 511 on the lock push button 51 Disengage the unlocking tooth slot 15, and then push the locking push button 51 to drive the interlocking locking bracket 52 and the knife holder 2 to move forward together, wherein the blade 3 is linked with the knife holder 2; when the locking push button 51 moves to the locking slot 16 At this point, the lock push button 51 is released, and the lock push button 51 rebounds upward under the return spring force of the compression spring 513, and the restricting protrusion 511 on the lock push button 51 snaps into the locking tooth slot 16, Because the height of the locking tooth slot 16 is lower than the height of the unlocking tooth slot 15, the bottom end of the lock push button 51 is partially inserted into the limiting sleeve hole 21 of the knife holder 2, thereby achieving the function of locking the knife holder 2, Furthermore, the blade 3 moving along with the blade holder 2 is telescopically locked. In addition, there are three locking slots 16 from front to back, so that the blade 3 has three telescopic locking positions.

As shown in FIG. 2 and FIG. 4, in this embodiment, the rear end of the knife holder 2 is provided with a limit clamping slot 22 which is matched with the front end of the interlocking lock holder 52; when the lock push button 51 and the knife When the rack 2 approaches, the interlocking lock frame 52 is inserted into the limit clamping groove 22 of the knife holder 2, so as to effectively prevent the movement misalignment between the interlocking lock frame 52 and the knife holder 2.

As shown in FIGS. 2 and 4, in this embodiment, a tension spring 6 is provided between the linkage lock frame 52 and the knife holder 2, which can facilitate the knife holder to carry the blade to shrink and reset, while ensuring that the blade will not The extension port of the blade is extended when not in use, which effectively prevents accidental injuries and other situations, improves safety performance, and is convenient for carrying the utility knife. Among them, a tension spring may also be provided between the knife holder 2 and the housing 1, and the function of the tension spring is the same as the function of the tension spring 6 described above.

As shown in FIGS. 1, 2 and 4, in this embodiment, the utility knife with a locking structure further includes a locking device 7, the locking device 7 includes a locking lever 71 and an adjusting device 72, the locking device 7 The locking device 71 is adjusted by the adjusting device 72 to lock the blade 3. The locking device provided by the invention adopts the structure of a locking lever to clamp the blade, so as to achieve the function of locking the blade, so that there will be no gap shaking during use, eliminating the need for people to manually apply pressure to limit the operation of the blade, and effectively avoiding the sliding of the blade. Cutting errors or accidentally injuring people appear to improve the cutting accuracy of this product.

As shown in FIGS. 1, 2, 3 and 4, in this embodiment, the inner wall of the left casing 12 is provided with an inclined protrusion 121 near the blade expansion port 11; the locking lever 71 is provided on the left casing 12 Between the inner wall and the blade 3, an adjusting device 72 is provided at the rear end of the housing 1; the locking lever 71 is controlled by the adjusting device 72 to achieve its telescopic movement toward the blade expansion port 11 and the front end of the locking lever 71 The inclined projection 121 reduces the gap with the blade 3 and clamps the locking blade 3. Among them, the inclined protrusion 121 is located between the blade 3 and the locking lever 71.

As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, in this embodiment, the adjusting device 72 includes a locking screw 721 and a locking knob 722. The locking knob 722 is provided with a coaxial and The screw hole 7221 matching the lock screw 721; the bottom end of the housing 1 is provided with a knob sleeve connecting hole 17 matching the lock knob 722; the lock knob 722 is matched sleeved in the knob sleeve connecting hole 17; the lock screw The front end of the 721 is matched and fixedly connected with the rear end of the lock rod 71, and the rear end of the lock screw 721 is matched with the threaded hole 7221 of the lock knob 722; The screw connection between them is adjusted to realize the telescopic movement toward the blade telescopic port 11. The present invention utilizes a threaded structure so that the lock screw 721 drives the lock rod 71 to perform a telescopic movement together under the adjustment of the lock knob 722, and reduces the gap with the blade 3 by clamping the protrusion 121 and clamps the lock blade 3. Restrict the expansion and contraction movement of the blade 3 and the sway of the gap, so that there is no need to use force to restrict the blade 3 in the use of the cutter, making it easier and more convenient for people to use. The lock lever 71 is provided with a guide groove 711 along the direction of its telescopic movement, and the inner wall of the left housing 12 is provided with a guide protrusion 123 matching the guide groove 711; the lock lever 71 is guided by The groove 711 is matched with the guide projection 123 to position and restrict the direction of expansion and contraction of the lock lever 71.

As shown in FIG. 2 and FIG. 4, in this embodiment, the blade 3 is provided with a clamping fixing hole 31, and the blade holder 2 is provided with a buckle 23 matching with the clamping fixing hole 31; the blade 3 passes the card The snap connection between the buckle 23 and the snap fixing hole 31 realizes the fixed connection with the knife holder 2. Wherein, the buckle 23 can be buckled with the knife holder 2 in the form of a snap connection, so that the buckle 23 has a certain movement resilience relative to the knife holder 2 to facilitate the card between the buckle 23 and the clip fixing hole 31 Buckle and detach.

As shown in FIGS. 1, 2, 3 and 4, in this embodiment, a tool change button 122 is also provided on the inner side wall of the left housing 12, and one end of the tool change button 122 is matched with the left housing 12 to snap-fit , The other end of the tool change button 122 penetrates the left casing 12 and then protrudes from the outer side of the left casing 12. The back structure of the end of the tool change button 122 protruding from the left casing 12 matches the snap 23; The tool-changing button 122 presses the top-opening buckle 23 to disengage the clamping fixing hole 31 to realize the blade 3 following. When using this product, just push the button 4 to the maximum extension of the blade 3, and use the side to press the part of the tool change button 122 that protrudes from the left housing 12, the tool change button 122 can push the blade 3 and the knife holder 2 apart The clamping structure between implements the tool change process.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principles of the present invention, several improvements and retouches can be made. These improvements and retouches should also be It is regarded as the protection scope of the present invention.

Claims

A utility knife with a locking structure, characterized in that the utility knife with a locking structure includes a housing (1), a knife holder (2), a blade (3), a push button (4) and a knife holder lock Device (5); the front end of the casing (1) is provided with a blade expansion port (11) for blade (3) expansion and contraction, and the side of the casing (1) is provided with a movable button (4) Chute; the blade (3) is matched and installed in the housing (1) through the blade holder (2), and the blade (3) is controlled by the push button (4) to perform telescopic activities at the blade expansion port (11) The knife holder locking device (5) achieves telescopic locking of the blade (3) by locking the knife holder (2).
The utility knife with a locking structure according to claim 1, characterized in that the housing (1) includes a left housing (12) and a right housing (13) that are spliced and fixed on the left and right; the right housing (13) The inner wall is provided with a blade holder sliding groove (131) penetrating the blade expansion port (11) and matching the blade holder (2); the top surface of the casing (1) is provided with a penetrating blade holder sliding groove (131) ) And the button chute (14) matched with the push button (4); the blade (3) is fixedly clamped on the knife holder (2), and the knife holder (2) carries the blade (3) and is matched and installed on the knife The sliding groove (131) of the rack; the push button (4) is matched and connected to the knife holder (2) and is exposed outside the casing (1) from the sliding groove (14) of the button;

The knife holder locking device (5) includes a gear lock push button (51) matched with the button slide slot (14), and a linkage lock rack (52) matched with the knife holder slide slot (131), A limit projection (511) is provided on the side of the gear lock push button (51); a housing (1) between the button slide slot (14) and the knife holder slide slot (131) is provided An unlocking cog slot (15) and a locking cog slot (16) matched with the limiting protrusion (511), the unlocking cog slot (15) is distributed at the rear end of the button slide slot (14), and the locking cog slot (15) 16) Distributed in front of the unlocking tooth slot (15), the height of the locking tooth slot (16) is lower than the height of the unlocking tooth slot (15); a spring is arranged in the middle of the bottom end of the gear locking push button (51) A hole (512), and a compression spring (513) matched with the spring hole (512) is provided; a front end of the linkage locking bracket (52) extends an extension higher than the knife holder (2) A plate (521), the extension plate (521) is provided with a through hole (522) matched with the bottom end of the shift lock button (51), and a spring is provided in the middle of the through hole (522) The compression spring bearing plate (523) matched with the hole (512); the top end of the knife holder (2) is provided with a restriction sleeve hole (21) matched with the bottom end of the gear lock push button (51);

The linkage locking bracket (52) is matched and installed on the knife holder sliding groove (131) and is located behind the knife holder (2), and the gear lock push button (51) is snap-fitted by a limiting protrusion (511) In the unlocking tooth slot (15), the bottom end of the gear locking push button (51) is matched with the through hole (522) and does not penetrate the through hole (522) under the force of the compression spring (513) ), the top of the gear lock push button (51) is exposed outside the housing (1) from the button chute (14) and is behind the push button (4); when the push button (4) is close to the gear lock push button (51), the limiting sleeve hole (21) of the knife holder (2) is located directly under the gear lock push button (51).
The utility knife with a locking structure according to claim 2, characterized in that: the rear end of the knife holder (2) is provided with a limit clamping engagement that matches with the front end of the linkage locking bracket (52) Groove (22).
The utility knife with a locking structure according to claim 2, characterized in that a tension spring (6) is provided between the linkage locking frame (52) and the blade frame (2).
The utility knife with a locking structure according to claim 1, wherein the utility knife with a locking structure further includes a locking device (7), and the locking device (7) includes a locking lever ( 71) and an adjusting device (72). The locking device (7) locks the blade (3) by adjusting the locking lever (71) through the adjusting device (72).
The utility knife with a locking structure according to claim 5, characterized in that: the inner wall of the left casing (12) is provided with an inclined protrusion (121) near the blade expansion opening (11); the locking The lever (71) is arranged between the inner wall of the left casing (12) and the blade (3), the adjusting device (72) is arranged at the rear end of the casing (1); the locking lever (71) passes the adjusting device ( 72) control to achieve its telescopic movement toward the blade telescoping opening (11), and the front end of the locking lever (71) reduces the gap between the blade (3) and the clamp by tilting the projection (121) Lock the blade (3) tightly.
The utility knife with a locking structure according to claim 6, characterized in that: the adjusting device (72) includes a locking screw (721) and a locking knob (722), the locking knob (722) A threaded hole (7221) coaxial with it and matching with the locking screw (721) is provided; the bottom end of the casing (1) is provided with a knob sleeve matched with the locking knob (722) Hole (17); the locking knob (722) is matched and sleeved in the knob sleeve hole (17); the front end of the locking screw (721) and the rear end of the locking lever (71) are matched and fixedly connected. The rear end of the lock screw (721) is matched with the threaded hole (7221) of the lock knob (722); the lock rod (71) is connected to the lock screw (721) through the thread of the lock knob (722) Adjust to realize the telescopic movement towards the blade telescopic opening (11).
The utility knife with a lock structure according to claim 1, characterized in that: the blade (3) is provided with a clamping and fixing hole (31), and the blade holder (2) is provided with a clamping and fixing The hole (31) matches the snap-fit buckle (23); the blade (3) realizes the fixed connection with the knife holder (2) through the snap-fit between the buckle (23) and the snap-fit fixing hole (31).
The utility knife with a locking structure according to claim 8, characterized in that: a tool change button (122) is further provided on the inner side wall of the left casing (12), and one end of the tool change button (122) Matching with the left casing (12), the other end of the tool change button (122) penetrates the left casing (12) and extends from the outer side of the left casing (12), and the tool change button (122) The back structure of the extended end of the left casing (12) matches with the buckle (23); the blade is released by pressing the top change buckle (23) out of the clamping fixing hole (31) by pressing the tool change button (122) 3) Follow-up.