A carving knife

Abstract

This application discloses a carving knife, comprising: a blade with a fixing hole; a knife holder including a first knife seat and a second knife seat radially movably disposed on the first knife seat, the first and second knife seats defining a clamping groove, the first knife seat having a fixing boss, wherein when the blade is disposed in the clamping groove, the fixing hole engages with the fixing boss to limit the displacement of the blade; a handle, the knife holder being connected to the handle; a bushing, the bushing being sleeved on the outside of the knife holder, the bushing being slidable relative to the knife holder to a locked position to clamp the blade between the first and second knife seats; and an elastic element including a first end and a second end, the first end abutting against the first knife seat, the second end abutting against the blade, the elastic element being adapted to push the blade to separate the fixing hole from the fixing boss. The carving knife of this application forms a double lock on the blade through the interlocking positioning of the "fixing hole-fixing boss" and the radial clamping of the "bushet-knife holder," preventing the blade from dislodging from the clamping groove during use.

Description

Technical Field

[0001] This application relates to the field of cutting tool technology, specifically to an engraving knife. Background Technology

[0002] A carving knife is a type of knife that resembles a ballpoint pen in shape, primarily used for precision cutting in areas such as model making, hand carving, and paper cutting. Currently available carving knives typically consist of a handle, a blade holder, and a blade. The blade holder has a slit-like groove at its front end. The blade is inserted into this groove and secured by the elastic deformation of the blade holder itself or by an external locking mechanism. However, most commercially available carving knives rely solely on the clamping force of the blade holder to lock the blade, making the blade prone to loosening, wobbling, or even accidental dislodgement, potentially causing cuts or reduced cutting precision. Summary of the Invention

[0003] One objective of this application is to provide a carving knife with a blade that is easy to install and remove and has a stable clamping mechanism.

[0004] To achieve the above objectives, the technical solution adopted in this application is: a carving knife, comprising:

[0005] The blade has a fixing hole.

[0006] The tool holder includes a first tool holder and a second tool holder that is radially movable on the first tool holder. The first tool holder and the second tool holder define a tool clamping groove. A fixing boss is provided on the first tool holder. When the blade is placed in the tool clamping groove, the fixing hole cooperates with the fixing boss to limit the displacement of the blade.

[0007] A handle, wherein the tool holder is connected to the handle;

[0008] A bushing is fitted over the outside of the tool holder. The bushing can slide relative to the tool holder to a locked position to clamp the blade between the first tool holder and the second tool holder, or slide to an unlocked position to release the blade between the first tool holder and the second tool holder.

[0009] The elastic element includes a first end and a second end, the first end abutting against the first tool holder and the second end abutting against the blade, the elastic element being adapted to push the blade radially away from the first tool holder, so as to separate the fixing hole from the fixing boss.

[0010] In some embodiments, the first tool holder is provided with a positioning post extending radially, and the second tool holder is provided with a first positioning hole. The second tool holder is radially movable on the first tool holder through the cooperation of the positioning hole and the positioning post.

[0011] In some embodiments, the front ends of the first tool holder and the second tool holder are provided with an outer conical surface, and the front end of the bushing is provided with an inner conical surface. When the bushing slides to the locking position, the inner conical surface wedges with the outer conical surface to generate a radial clamping force between the first tool holder and the second tool holder to lock the blade.

[0012] In some embodiments, the tool holder is threadedly connected to the tool shank, and the bushing is sleeved on the outside of the tool holder with its rear end abutting against the tool shank. When the tool holder is tightened, the bushing can slide axially relative to the tool holder to a locked position so that the inner conical surface weds into the outer conical surface. When the tool holder is loosened, the bushing can slide axially relative to the tool holder to an unlocked position so that the inner conical surface separates from the outer conical surface.

[0013] In some embodiments, the elastic element is provided with a second positioning hole, and the elastic element is disposed on the first tool holder through the cooperation of the positioning post with the second positioning hole.

[0014] In some embodiments, the elastic member includes a first arm at its front end and a second arm at its rear end. The first arm and the second arm are integral structures formed by bending a spring with elastic return capability. The ends of the first arm and the second arm form the first end and abut against the first blade holder. The connecting portion of the first arm and the second arm forms the second end and abuts against the blade. The first arm and / or the second arm are provided with a relief groove for the fixing boss to pass through.

[0015] In some embodiments, the front end of the first tool holder is further provided with a receiving groove, and the end of the first support arm is accommodated in the receiving groove.

[0016] In some embodiments, the first arm and the second arm are inclined in opposite directions, and the slope of the first arm is greater than the slope of the second arm.

[0017] In some embodiments, the fixing boss includes a guide surface at its top and a locking surface at its side. The guide surface is inclined along the insertion direction of the blade and is adapted to abut against the blade to guide the blade to slide into the clamping groove. The locking surface is perpendicular to the first blade holder and is adapted to abut against the blade to restrict the displacement of the blade.

[0018] In some embodiments, the second tool holder is provided with a clearance groove, the position of which corresponds to the position of the fixed boss, and the clearance groove is adapted to accommodate at least a portion of the fixed boss.

[0019] Compared with the prior art, the beneficial effects of this application are as follows:

[0020] (1) The blade is double locked by the interlocking positioning of the "fixed hole-fixed boss" and the wedge clamping of the "inner conical surface-outer conical surface", which restricts the axial, circumferential and radial displacement of the blade and avoids the blade from loosening, shaking or accidentally falling off under long-term and high-frequency operation, which significantly improves the safety and cutting accuracy of the engraving knife.

[0021] (2) The blade is easy to install and remove without the need for external tools. When disassembling, simply loosen the tool holder to separate the inner conical surface of the bushing from the outer conical surface of the tool holder. The elastic element will immediately push the blade radially upward, and the fixing hole will automatically disengage from the fixing boss, allowing the blade to be easily removed. When installing, simply insert the blade into the clamping slot. Under the guidance of the fixing boss, the blade will automatically slide into place. Then tighten the tool holder to wedge the inner conical surface of the bushing into the outer conical surface of the tool holder to complete the locking. Attached Figure Description

[0022] Figure 1 This is an exploded diagram of the carving knife in this application.

[0023] Figure 2 This is a front view of the tool holder in this application.

[0024] Figure 3 This is an exploded schematic diagram of the tool holder in this application.

[0025] Figure 4 This is a schematic diagram of the second tool holder in this application.

[0026] Figure 5 This is a schematic diagram showing the blade in the clamping groove not having slid to the installation position in this application.

[0027] Figure 6 This is a schematic diagram of the blade sliding in the clamping groove to the installation position in this application.

[0028] Figure 7 This is a cross-sectional view of the tool holder in this application.

[0029] Figure 8 This is a schematic diagram of the bushing in the unlocked position in this application.

[0030] Figure 9 This is a schematic diagram of the bushing in the locked position in this application.

[0031] Figure 10 This is a cross-sectional schematic diagram of the bushing in this application.

[0032] Figure 11 This is a front view of the elastic element in this application.

[0033] Figure 12This is a schematic diagram of the fit between the elastic element and the tool holder in this application.

[0034] In the diagram: 100, blade; 110, fixing hole; 200, tool holder; 210, locking seat; 220, first tool holder; 221, fixing boss; 222, positioning pin; 223, receiving groove; 224, guide surface; 225, locking surface; 230, second tool holder; 231, first positioning hole; 232, clearance groove; 240, tool clamping groove; 250, outer conical surface; 300, tool handle; 310, first abutment surface; 320, second abutment surface; 330, concave surface; 340, first inner sidewall; 350, second inner sidewall; 400, bushing; 410, main sleeve body; 420, connecting body; 430, abutment boss; 440, inner conical surface; 500, elastic element; 510, first support arm; 520, second support arm; 530, second positioning hole; 540, clearance groove. Detailed Implementation

[0035] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0036] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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. They should not be construed as limiting the specific protection scope of this application.

[0037] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0038] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0039] like Figure 1As shown in the figure, this application provides a pen-shaped knife, which includes a blade 100, a knife holder 200, a handle 300, a bushing 400, and an elastic element 500.

[0040] The blade 100 has a fixing hole 110 at its rear end.

[0041] The tool holder 200 and the blade 100 are housed within the tool holder 200. For example... Figure 3-4 As shown, the tool holder 200 includes a locking seat 210 at its rear end and a first tool holder 220 and a second tool holder 230 at its front end. The locking seat 210 is fixedly connected to the first tool holder 220. Preferably, the locking seat 210 and the first tool holder 220 are integrally formed and connected. The second tool holder 230 is radially movably disposed on the first tool holder 220. The first tool holder 220 and the second tool holder 230 define a clamping groove 240 for placing the blade 100. The second tool holder 230 can move radially relative to the first tool holder 220 to adjust the tightness of the clamping groove 240, thereby allowing the first tool holder 220 and the second tool holder 230 to clamp or release the blade 100 placed in the clamping groove 240. A fixing boss 221 is provided on the first tool holder 220. When the blade 100 is placed in the clamping groove 240, the fixing hole 110 engages with the fixing boss 221 to limit the axial and circumferential displacement of the blade 100. In addition, the front ends of the first tool holder 220 and the second tool holder 230 are provided with an outer conical surface 250, and the outer peripheral wall of the locking seat 210 is provided with an external thread.

[0042] The movable connection between the first tool holder 220 and the second tool holder 230 is not limited. In the embodiment provided in this application, the first tool holder 220 is provided with a radially extending positioning post 222, and the second tool holder 230 is provided with a first positioning hole 231. The second tool holder 230 is radially movable on the first tool holder 220 through the cooperation of the first positioning hole 231 and the positioning post 222, so that the second tool holder 230 can move radially closer to or away from the first tool holder 220, thereby clamping or releasing the cutting tool 100. In addition, the first tool holder 220 and the second tool holder 230 can also be connected by other movable connection methods such as sliding grooves.

[0043] The second tool holder 230 is also provided with a relief groove 232. The position of the relief groove 232 corresponds to the position of the fixed boss 221. The relief groove 232 is suitable for accommodating at least part of the fixed boss 221, so that the end face of the second tool holder 230 can be attached to the blade 100 or to the end face of the first tool holder 220.

[0044] Furthermore, such as Figure 5-6As shown, the fixed boss 221 includes a guide surface 224 located on its top and a locking surface 225 located on its side. The guide surface 224 is inclined along the insertion direction of the blade 100, that is, the vertical height of the front end of the fixed boss 221 is low and the vertical height of the rear end of the fixed boss 221 is high, so that the fixed boss 221 has a wedge-shaped structure. When the blade 100 is inserted into the clamping groove 240 axially, the blade 100 abuts against the guide surface 224 and slides along the guide surface 224. The locking surface 225 is set perpendicular to the end face of the first tool holder 220. The locking surface 225 is adapted to abut against and cooperate with the fixing hole 110 of the blade 100 to limit the axial displacement and circumferential displacement of the blade 100.

[0045] The tool holder 300 is connected to the tool post 200. For example... Figure 7-10 As shown, the front end of the knife handle 300 is provided with a first cavity and a second cavity. The first cavity and the second cavity are interconnected and arranged along the axial direction of the knife handle 300. The inner diameter of the first cavity is larger than the inner diameter of the second cavity, thereby giving the knife handle 300 a first abutment surface 310, a second abutment surface 320 formed by the inward indentation of the first abutment surface 310, and an inward concave surface 330 formed by the inward indentation of the second abutment surface 320. A first abutment surface 310 and the second abutment surface 320 form a first... The inner sidewall 340, the second abutment surface 320 and the concave surface 330 form a second inner sidewall 350. The inner diameter of the first inner sidewall 340 is larger than the inner diameter of the second inner sidewall 350. The inner peripheral wall of the second inner sidewall 350 is provided with an internal thread. The internal thread on the second inner sidewall 350 is suitable for engaging with the external thread on the locking seat 210, so that the tool holder 200 is threadedly connected to the tool holder 300. Therefore, the tool holder 200 can be loosened or tightened relative to the tool holder 300, so that the tool holder 200 can extend and retract axially relative to the tool holder 300.

[0046] Bushing 400 is fitted onto the outside of tool holder 200. For example... Figure 8-10 As shown, the bushing 400 includes a main sleeve body 410 and a connecting body 420 disposed at the rear end of the main sleeve body 410. The main sleeve body 410 and the connecting body 420 are integrally formed and connected. The outer diameter of the main sleeve body 410 is larger than the outer diameter of the connecting body 420. There is an abutting boss 430 between the main sleeve body 410 and the connecting body 420. The main sleeve body 410 and the connecting body 420 are sleeved on the outside of the tool holder 200, so that the connecting body 420 is received in the first cavity, that is, the end face of the connecting body 420 abuts and engages with the second abutting surface 320 and / or the abutting boss 430 abuts and engages with the first abutting surface 310.

[0047] Furthermore, the front end of the main sleeve 410 is provided with an inner conical surface 440, which is adapted to mate with the outer conical surfaces 250 on the first tool holder 220 and the second tool holder 230. Specifically, when the tool holder 200 is tightened, the tool holder 200 retracts axially relative to the tool shank 300. Since one end of the bushing 400 abuts against the tool shank 300, the bushing 400 slides axially forward relative to the tool holder 200. The bushing 400 slides to a locking position, at which point the inner conical surface 440 and the outer conical surface 250 wedge together, causing the first tool holder 220 and the second tool holder 230 to generate a radial clamping force, thereby clamping and locking the cutting tool 100. When the tool holder 200 is loosened, the tool holder 200 extends forward axially relative to the tool holder 300. Since one end of the bushing 400 abuts against the tool holder 300, the bushing 400 slides backward axially relative to the tool holder 200. The bushing 400 slides to an unlocked position, at which point the inner conical surface 440 separates from the outer conical surface 250 so that the first tool holder 220 and the second tool holder 230 no longer generate radial clamping force, and the first tool holder 220 and the second tool holder 230 release the unlocking blade 100.

[0048] The elastic element 500 is disposed within the tool groove. For example... Figure 11-12 As shown, the elastic element 500 includes a first end and a second end. The first end abuts against the first cutter holder 220, and the second end abuts against the blade 100. The elastic element 500 is adapted to push the blade 100 to move radially away from the first cutter holder 220. Therefore, as long as the bushing 400 slides to the unlocked position so that the first cutter holder 220 and the second cutter holder 230 release the blade 100, the blade 100 will separate from the fixed boss 221 under the action of the elastic element 500, and the blade 100 can be easily removed from the clamping groove 240.

[0049] The elastic element 500 includes a first arm 510 at its front end and a second arm 520 at its rear end. The first arm 510 and the second arm 520 are integral structures formed by bending a spring with elastic return capability. The ends of the first arm 510 and the second arm 520 form the aforementioned first end and abut against the first blade holder 220. The connecting part of the first arm 510 and the second arm 520 forms the aforementioned second end and abuts against the blade 100. The first arm 510 and the second arm 520 are respectively inclined in opposite directions. The second arm 520 is provided with a second positioning hole 530. The elastic element 500 is installed on the first blade holder 220 through the second positioning hole 530 and the positioning post 222. The first arm 510 and / or the second arm 520 are also provided with a relief groove 540. The fixing boss 221 can pass through the relief groove 540 and cooperate with the fixing hole 110 on the blade 100.

[0050] Optionally, the starting end of the relief groove 540 is located on the second support arm 520, and the ending end of the relief groove 540 is located on the first support arm 510, that is, the relief groove 540 extends from the second support arm 520 to the first support arm 510.

[0051] Optionally, the starting end of the relief groove 540 is located on the second support arm 520, the ending end of the relief groove 540 is located on the first support arm 510, and the ending end of the relief groove 540 is connected to the outside, that is, the relief groove 540 is a groove that is open at one end and extends axially.

[0052] It is worth mentioning that the slope of the first arm 510 is greater than that of the second arm 520. Since the first arm 510 and the second arm 520 have the same height in the vertical direction, the first arm 510 with a larger slope has a shorter length in the horizontal direction than the second arm 520 with a smaller slope. This makes the second end of the elastic member 500 closer to the front end of the clamping groove 240, and the position of the second end against the blade 100 closer to the middle of the blade 100. As a result, when the blade 100 is pushed by the elastic member 500, it can move smoothly in the radial direction, avoiding the situation where the rear end of the blade 100 is higher than the front end during the pushing process, and preventing the blade 100 from getting stuck and unable to be taken out smoothly.

[0053] like Figure 12 As shown, the front end of the first tool holder 220 is provided with a receiving groove 223, which is adapted to receive the end face of the first support arm 510, so that the end of the first support arm 510 is lower than the end face of the first tool holder 220. With the above-described structure, during the process of inserting the blade 100 into the clamping groove 240 axially while it is attached to the end face of the first tool holder 220, the blade 100 will not come into contact with the end of the first support arm 510, causing the elastic element 500 to deform axially and generate an axial force that would prevent the blade 100 from entering the clamping groove 240. The blade 100 will only come into contact with the main body of the first support arm 510 and slide along the main body of the first support arm 510 into the clamping groove 240. The elastic element 500 deforms radially and generates a radial force that presses the blade 100 against the end face of the second tool holder 230. That is, the elastic element 500 applies a preload force to the blade 100, so that the blade 100 will not come out of the clamping groove 240 when the external force it receives does not exceed a preset value, thus facilitating the installation of the blade 100.

[0054] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. An engraving tool characterized in that, include: The blade has a fixing hole. The tool holder includes a first tool holder and a second tool holder that is radially movable on the first tool holder. The first tool holder and the second tool holder define a tool clamping groove. A fixing boss is provided on the first tool holder. When the blade is placed in the tool clamping groove, the fixing hole cooperates with the fixing boss to limit the displacement of the blade. A handle, wherein the tool holder is connected to the handle; A bushing is fitted over the outside of the tool holder. The bushing can slide relative to the tool holder to a locked position to clamp the blade between the first tool holder and the second tool holder, or slide to an unlocked position to release the blade between the first tool holder and the second tool holder. The elastic element includes a first end and a second end, the first end abutting against the first tool holder and the second end abutting against the blade, the elastic element being adapted to push the blade radially away from the first tool holder, so as to separate the fixing hole from the fixing boss.

2. The carving knife as described in claim 1, characterized in that, The first tool holder is provided with a positioning post extending radially, and the second tool holder is provided with a first positioning hole. The second tool holder is radially movable on the first tool holder through the cooperation of the first positioning hole and the positioning post.

3. The carving knife as described in claim 1, characterized in that, The front ends of the first and second tool holders are provided with outer conical surfaces, and the front end of the bushing is provided with an inner conical surface. When the bushing slides to the locking position, the inner conical surface wedges with the outer conical surface to generate a radial clamping force between the first and second tool holders and lock the blade.

4. The carving knife as described in claim 3, characterized in that, The tool holder is threadedly connected to the tool handle. The bushing is sleeved on the outside of the tool holder, and the rear end of the bushing abuts against the tool handle. When the tool holder is tightened, the bushing can slide axially relative to the tool holder to the locked position so that the inner conical surface wedges with the outer conical surface. When the tool holder is loosened, the bushing can slide axially relative to the tool holder to the unlocked position so that the inner conical surface separates from the outer conical surface.

5. The carving knife as described in claim 2, characterized in that, The elastic element is provided with a second positioning hole, and the elastic element is disposed on the first tool holder through the cooperation of the positioning post with the second positioning hole.

6. The carving knife as described in claim 5, characterized in that, The elastic element includes a first arm at its front end and a second arm at its rear end. The first arm and the second arm are integral structures formed by bending a spring with elastic return capability. The ends of the first arm and the second arm form the first end and abut against the first blade holder. The connecting part of the first arm and the second arm forms the second end and abuts against the blade. The first arm and / or the second arm are provided with a relief groove for the fixing boss to pass through.

7. The carving knife as described in claim 6, characterized in that, The front end of the first tool holder is also provided with a receiving groove, and the end of the first support arm is accommodated in the receiving groove.

8. The carving knife as described in claim 6, characterized in that, The first arm and the second arm are inclined in opposite directions, and the slope of the first arm is greater than that of the second arm.

9. The carving knife as described in claim 1, characterized in that, The fixed boss includes a guide surface at its top and a locking surface at its side. The guide surface is inclined along the insertion direction of the blade and is adapted to abut against the blade to guide the blade to slide into the clamping groove. The locking surface is perpendicular to the first blade holder and is adapted to abut against the blade to restrict the displacement of the blade.

10. The carving knife as described in claim 1, characterized in that, The second tool holder is provided with a clearance groove, the position of which corresponds to the position of the fixed boss, and the clearance groove is adapted to accommodate at least part of the fixed boss.

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