TWI700167B - Utility knife - Google Patents

Abstract

A utility knife is provided, including: a first housing, including a shaft disposed thereon and having an axis; a second housing, rotatably mounted to the shaft and including a first engaging portion; a blade carrier, movably received between the first housing and the second housing, and being operable, from an outside of the first housing and the second housing, to move; a locking mechanism, disposed through the second housing and being non-rotatable relative to the shaft, the locking mechanism being axially slidable between a locking position and a releasing position along the shaft, the locking mechanism including a pressing end which is operable, from the outside of the first housing and the second housing, to move axially and an engaging end which is comovable with the pressing end, the engaging end including a second engaging portion; wherein one of the first engaging portion and the second engaging portion includes at least one engaging groove, and the other of the first engaging portion and the second engaging portion includes at least one projection which is releasably engageable with the at least one engaging groove, one of the at least one engaging groove and the at least one projection includes a first inclined surface which is tilted relative to the axis, and the other of the at least one engaging groove and the at least one projection includes an abutting portion which is abuttable against the first inclined surface; wherein when the locking mechanism is in the locking position and the at least one projection is engaged within the at least one engaging groove, the second housing is non-rotatable relative to the first housing; when the locking mechanism is in the releasing position, the at least one projection is disengaged from the at least one engaging groove and the second housing is rotatable about the locking mechanism and rotatable relative to the first housing.

Description

Utility knife

The invention relates to a utility knife.

A general utility knife includes a housing, a knife holder slidably arranged in the housing, and a blade mounted on the knife holder. Generally, the blade of a utility knife is trapezoidal and has a sharp blade on two opposite sides. After one blade is dull or damaged, the blade is turned over to use the other blade or replace the blade.

However, for the utility knife, the tool holder and the blade are clamped between the two shells through screw locks, such as TWI309197. Therefore, when the blade is to be turned over or replaced, the two housings must be relatively separated, which is extremely difficult to disassemble and replace.

Therefore, it is necessary to provide a novel and progressive utility knife to solve the above-mentioned problems.

The main purpose of the present invention is to provide a utility knife that can quickly and safely replace the blade.

To achieve the above object, the present invention provides a utility knife, which includes: a first housing provided with a pivot, the pivot has an axis; a second housing is pivotally connected to the pivot and provided with a The first engaging portion; a knife seat, movably accommodated between the first housing and the second housing, and can Operate and move from the outside; a lock and release mechanism that penetrates the second housing and does not rotate relative to the pivot, and can slide between a locked position and a release position along the pivot axis, including a The pressing end of the operating shaft moves and a catching end linked with the pressing end. The catching end is provided with a second catching portion; wherein, one of the first catching portion and the second catching portion is provided with At least one card slot and the other one is provided with at least one card protrusion that can be releasably engaged with the at least one card slot, and one of the at least one card slot and the at least one card protrusion includes a tilt with respect to the axis The first inclined surface and the other include a top portion that is pressed against the first inclined surface; wherein, when the locking mechanism is in the locking position and the at least one engaging protrusion is engaged with the at least one engaging groove, the second The second housing cannot rotate relative to the first housing; when the locking and releasing mechanism is in the release position, the at least one engaging protrusion and the at least one engaging groove are separated from each other, and the second housing can be relative to the first housing around the locking and releasing mechanism. A housing rotates.

1: Utility knife

10: The first shell

11: pivot

41: press end

411: card hole

42: Card arrives at the end

111: Axis

12: retaining edge

20: second shell

21: The first card arrives

211: card slot

212: reach the top

213: Guide groove

214: wide section

215: groove

216: second slope

22: Channel

23: Notch

30: knife holder

31: Restrictions

40: lock and release mechanism

421: The second card arrives

422: card convex

423: first slope

424: Card Arm

425: Hook

426: Convex Rib

43: elastic element

50: elastic pieces

51: Card concave

52: Through hole

53: cover

54: Card

55: Elastic

60: Magnetically attractable parts

100: blade

Figure 1 is a perspective view of a preferred embodiment of the present invention.

Figure 2 is an exploded view of a preferred embodiment of the present invention.

Figure 3 is another exploded view of a preferred embodiment of the present invention.

Figure 4 is a side view of a preferred embodiment of the present invention.

Fig. 5 is a schematic diagram of the operation of a preferred embodiment of the present invention.

Fig. 6 is a partial schematic diagram of a preferred embodiment of the present invention.

Figure 7 is a partial cross-sectional view of a preferred embodiment of the present invention.

Fig. 8 is another partial schematic diagram of a preferred embodiment of the present invention.

9 to 11 are schematic diagrams of the structure configuration of the tool holder and the housing of a preferred embodiment of the present invention.

12 to 13 are schematic cross-sectional views taken along A-A in FIG. 4.

Fig. 14 is a schematic cross-sectional view taken along B-B in Fig. 4.

The following examples are only used to illustrate the possible implementation aspects of the present invention, but they are not intended to limit the scope of protection of the present invention, and are described first.

Please refer to FIGS. 1 to 14, which show a preferred embodiment of the present invention. The utility knife 1 of the present invention includes a first housing 10, a second housing 20, a knife holder 30 and a locking mechanism 40.

The first housing is provided with a pivot 11, and the pivot has an axis 111. The second housing is pivotally connected to the pivot rotatably and is provided with a first engaging portion 21. The knife holder is movably accommodated between the first housing and the second housing, and the knife holder can be operated and moved outside. The lock and release mechanism penetrates the second housing and does not rotate relative to the pivot. The lock and release mechanism is preferably coaxial with the pivot, and the lock and release mechanism can slide axially along the pivot to a locked position ( 7 and 12) and a release position (FIG. 13), the locking mechanism includes a pressing end 41 that can be moved by an external operating shaft and a catching end 42 linked with the pressing end. The catching end A second engaging portion 421 is provided. Wherein, one of the first engaging portion and the second engaging portion is provided with at least one card slot 211, and the other is provided with at least one card protrusion 422 that can be releasably engaged with the at least one card slot , One of the at least one card slot and the at least one card protrusion includes a first inclined surface 423 inclined with respect to the axis, and the other includes a top portion 212 that engages with the first inclined surface, which can stably engage Shake, but the card slot and the card protrusion can also be set without bevel. Wherein, when the locking mechanism is in the locking position and the at least one locking protrusion is engaged with the at least one locking groove, the second casing cannot rotate relative to the first casing; when the locking mechanism is in the release position , The at least one card protrusion and the at least one card slot are separated from each other, and the second housing The body can rotate around the locking mechanism relative to the first housing (Figure 5 and Figure 13). Thereby, the blade 100 can be replaced quickly and safely.

One of the pressing end and the engaging end is provided with at least one engaging hole 411, and the other is provided with at least one engaging arm 424 for engaging with the plurality of engaging holes. Preferably, the second housing further includes at least one guide groove 213 extending around the axis, and the at least one clamping arm pierces through the at least one guide groove rotatably around the axis. Each of the guide grooves includes a wide section 214 that widens radially outwards to facilitate the passage of the clamping arm. In this embodiment, the peripheral wall of the pressing end is provided with two locking holes, the locking end is provided with two locking arms, the end of each locking arm is provided with a hook 425, and the second housing is provided with two locking arms. A guide groove, each of the clamping arms passes through a guide groove and hooked into a clamping hole by the hook part (Figure 6 and Figure 8). The second housing can rotate around the two clamping arms stably and smoothly through the two guide grooves.

In this embodiment, the second housing is provided with the at least one engaging projection, the engaging end is provided with the at least one engaging groove, the at least one engaging projection includes a plurality of widthwise extending ribs 426, the at least one engaging The groove includes a plurality of grooves 215 extending in the width direction and releasably embedding with the plurality of ribs (but it can also be configured as a card protrusion and a plurality of grooves) to increase the locking effect and multi-stage positioning. The abutting top includes a second inclined surface 216 capable of engaging with the first inclined surface. The inclination of the first inclined surface and the second inclined surface with respect to the axis are substantially the same, and the depth of the groove is greater than the height of the protrusion (Figure 7), however, the inclination of the first inclined surface and the second inclined surface with respect to the axis can be different, so as to ensure that the first inclined surface and the second inclined surface are stably locked and not shaken. The locking mechanism further includes an elastic element 43 set on the pivot shaft and elastically abutting between the first housing and the abutting end, so as to ensure that the abutting top does and stably abuts against the first inclined surface.

One of the first housing and the second housing is protruded with at least one elastic clip 50, and the other is provided with at least one recess 51 that can be releasably positioned with the at least one elastic clip. One of the first housing and the second housing further includes at least one through hole 52 for accommodating the at least one elastic clip, and a cover 53 for covering the at least one through hole. In this embodiment, the first housing is provided with the through hole, and the at least one elastic clip A clamping member 54 and an elastic member 55 can be easily assembled in the through hole, and the elastic clamping member can be simply packaged through the cover (FIG. 14) without the need to additionally shrink the through hole. The second housing further includes a channel 22, and the knife holder is provided with a restricting member 31 (FIG. 10 and FIG. 11) that extends toward the second housing and can enter and exit the channel. The knife holder can be opposed to the first The housing moves between a knife-out position and a knife-retracting position; when the knife holder is at the knife-receiving position (as shown in Figure 10), the restricting member moves out of the channel and moves in a direction of rotation of the second housing The upper part does not interfere with the second housing, and when the lock and release mechanism is in the release position, the second housing can rotate around the lock and release mechanism relative to the first housing; when the knife holder faces the knife When the position (as shown in FIG. 11) moves, the restricting member moves into the channel, and the second housing cannot rotate relative to the first housing. Thereby, it can be ensured that the second housing can be rotated only when the blade is not exposed to prevent injury to the user.

Preferably, the first housing is additionally provided with a magnetically attractable member 60 (FIGS. 2 and 3 ), and the magnetically attractable member and the knife holder can be relatively magnetically attracted. At least one of the magnetically attractable member and the blade holder has magnetism. For example, the magnetically attractable member is a magnet, the blade holder includes a magnetic metal material, and the magnetically attractable member can magnetically attract the blade holder. The tool holder can be kept on the first housing without being detached at will. One of the first housing and the second housing can be provided with a retaining edge 12 that can block the other, which can ensure the closed position of the first housing and the second housing, preferably The other of the first shell and the second shell is provided with a notch 23 or a shoulder (Figure 2) for accommodating the retaining edge to make the appearance more flat.

1: Utility knife

10: The first shell

20: second shell

40: lock and release mechanism

Claims (10)

A utility knife, comprising: a first housing provided with a pivot, the pivot having an axis; a second housing rotatably pivotally connected to the pivot and provided with a first engaging portion; and a knife seat , Movably accommodated between the first housing and the second housing, and can be operated and moved externally; a lock and release mechanism, penetrates the second housing and does not rotate relative to the pivot, can Sliding along the pivot axis between a locked position and a released position, it includes a pressing end that can be moved by an external operating shaft and a catching end linked with the pressing end. The catching end is provided with a second catch Abutment portion; wherein one of the first and second engagement portions is provided with at least one slot, and the other is provided with at least one card that can be releasably embedded with the at least one slot Convex, one of the at least one card slot and the at least one card protrusion includes a first inclined surface inclined with respect to the axis, and the other includes a top of the first inclined surface that is pressed against the first inclined surface; wherein, when the lock is placed The mechanism is in the locked position and the at least one engaging projection is engaged with the at least one engaging slot, the second housing cannot rotate relative to the first housing; when the locking mechanism is in the release position, the at least one engaging projection Disengaged from the at least one slot, the second housing can rotate around the locking mechanism relative to the first housing. The utility knife according to claim 1, wherein one of the pressing end and the detent end is provided with at least one detent hole, and the other is provided with at least one detent arm that engages with the plurality of detent holes. The utility knife according to claim 2, wherein the second housing further includes at least one guiding groove extending around the axis, and the at least one clamping arm is rotatably inserted through the at least one guiding groove around the axis. The utility knife according to claim 3, wherein each of the guide grooves includes a wide section that widens radially outward. The utility knife according to claim 1, wherein one of the first housing and the second housing is provided with at least one elastic clip, and the other is provided with at least one and the at least one elastic clip. Release the groove of the ground phase positioning. The utility knife according to claim 5, wherein one of the first housing and the second housing further includes at least one through hole for accommodating the at least one elastic clip, and a cover for covering the at least one through hole Cover pieces. The utility knife according to claim 1, wherein the at least one protrusion includes a plurality of widthwise extending ribs, and the at least one groove includes a plurality of widthwise extending grooves that can be releasably embedded with the plurality of ribs groove. The utility knife according to claim 1, wherein the first housing is additionally provided with a magnetically attractable member, and the magnetically attractable member and the knife holder can be relatively magnetically attracted. The utility knife according to any one of claims 1 to 8, wherein the abutting top portion includes a second inclined surface that can be engaged with the first inclined surface. The utility knife according to any one of claims 1 to 8, wherein the second housing further includes a channel, and the knife seat is provided with a restricting member extending toward the second housing and capable of entering and exiting the channel, the The knife holder can move relative to the first housing between a knife exit position and a knife retract position; when the knife holder is located at the knife retract position, the restricting member moves out of the channel and is located in one of the second housings The rotation direction does not interfere with the second housing, and when the locking mechanism is in the release position, the second housing can rotate around the locking mechanism relative to the first housing; when the tool holder faces the When the knife exit position moves, the restricting member moves into the channel, and the second housing cannot rotate relative to the first housing.

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