CN2394766Y - Folding knife - Google Patents

本实用新型涉及一种折叠刀,它主要是在刀柄上设置有一可与刀部相互卡制的锁件,在锁件上设置解除结构与复位弹簧,由此构成一种可当刀部展开时稳固定位并易于收折的折叠刀。

The utility model relates to a folding knife. A lock piece which can be mutually locked with a knife part is mainly arranged on the knife handle, and a release structure and a reset spring are arranged on the lock piece, thereby forming a folding knife which can be firmly positioned when the knife part is unfolded and is easy to fold.

折叠刀folding knife

本实用新型涉及刀具，特别涉及一种可方便地收折并稳固地展开定位的折叠刀。The utility model relates to a knife, in particular to a folding knife which can be conveniently folded and stably unfolded for positioning.

刀具，乃是一种常用的手工具，其结构一般设有一刀柄及一刀部。传统刀具的刀柄与刀部间一般呈固定设置的结合形态，以使刀具能够承受切割物品时的受力。然而此种无法收折的传统刀具在不使用时，不仅会占有较大的空间，而且不易携带与收藏，并且外露的刀部容易割伤人员，在安全上会有所顾虑。因此，有人设计出一种可折叠的刀具，以便刀具在不使用时能将刀部收合于刀柄中，如此缩小刀具收藏与携带的体积，提高刀具的使用安全性。A knife is a commonly used hand tool, and its structure is generally provided with a handle and a knife portion. The handle of a traditional knife and the knife part are generally in a fixed combination form, so that the knife can bear the force when cutting objects. However, such traditional knives that cannot be folded not only occupy a large space when not in use, but are also not easy to carry and store, and the exposed knives are easy to cut people, and there will be concerns about safety. Therefore, someone has designed a foldable knife so that the knife part can be folded in the handle when the knife is not in use, so that the volume of knife storage and carrying is reduced, and the use safety of the knife is improved.

然而传统的折叠刀结构虽可折叠收合，但在展开使用时，若刀部的刀背受到较大的外力时，刀部便会很容易地不由自主地相对刀柄转动而收合，如此就会很容易地导致使用者受伤，而且传统折叠刀在折叠时较为麻烦，存在着安全性及方便性的问题和缺点，有必要作进一步的改进。However, although the structure of the traditional folding knife can be folded and folded, when the knife back of the knife is subjected to a relatively large external force when it is unfolded for use, the knife will easily and involuntarily rotate relative to the handle and fold, so that the It is easy to cause the user to be injured, and the traditional folding knife is more troublesome when folding, and there are problems and shortcomings of safety and convenience, so it is necessary to make further improvements.

本实用新型的目的是提供一种折叠刀，它主要是设置由两相间隔的内隔片所组成的刀柄，在刀柄上枢设刀部，在刀柄上还设置一可让刀部在展开时稳固定位的锁件，并在锁件上设置一可解除锁件与刀部间锁定关系的解除结构及一复位弹簧，由此能缩小刀具收藏体积，提高使用安全性。The purpose of this utility model is to provide a folding knife, which is mainly provided with a knife handle composed of two spaced inner partitions, a knife part is pivotally set on the knife handle, and a knife part is also arranged on the knife handle The lock piece is stably positioned when unfolded, and a release structure and a return spring that can release the locking relationship between the lock piece and the knife portion are arranged on the lock piece, thereby reducing the storage volume of the knife and improving the safety of use.

本实用新型的技术方案如下：The technical scheme of the utility model is as follows:

一种折叠刀，它主要是在一刀柄上枢设有一刀部，所述刀柄主要是由两相间隔设置的内隔片所组成，在刀部与刀柄相枢设的一端形成有一弧部，在刀部位于弧部顶缘的位置上凹设有一卡制凹槽；所述刀柄的两内隔片上设置有一可卡抵于刀部卡制凹槽的锁件，在锁件上设置有可解除锁件与刀部卡制关系的解除结构，在锁件上还设置有一复位弹簧。A folding knife, which is mainly provided with a knife part pivoted on a knife handle. The knife handle is mainly composed of two inner partitions arranged at intervals. A locking groove is recessed at the position where the knife is located at the top edge of the arc; the two inner partitions of the handle are provided with a lock that can be stuck against the locking groove of the knife, and on the lock A release structure that can release the clamping relationship between the lock piece and the knife portion is provided, and a return spring is also arranged on the lock piece.

所述锁件主要是设置有一垂直贯穿于两内隔片间，且能相对卡入刀部卡制凹槽中的卡制轴，所述复位弹簧的两端分别连结定位于卡制轴及一内隔片上，在内隔片上设置有可供复位弹簧一端勾抵的弹簧勾槽。The lock is mainly provided with a locking shaft that vertically penetrates between the two inner partitions and can be relatively locked into the locking groove of the knife portion. The two ends of the return spring are respectively connected and positioned on the locking shaft and a locking shaft. On the inner septum, a spring hook groove for one end of the return spring to be hooked is arranged on the inner septum.

所述卡制轴位于两内隔片间的位置处轴向凹设形成有一与刀部的卡制凹槽相对的让槽。The clamping shaft is located between the two inner partitions and is axially recessed to form a relief groove opposite to the clamping groove of the knife portion.

所述卡制轴上径向凸设形成有一可卡入刀部卡制凹槽中的卡制杆。The clamping shaft is radially protruded to form a clamping rod that can be clamped into the clamping groove of the knife portion.

所述解除结构为一体成型于卡制轴上的拨柄，拨柄的自由端延伸外露于刀柄外侧。The release structure is integrally formed on the handle on the clamping shaft, and the free end of the handle is extended and exposed outside the handle.

所述解除结构是在卡制轴的同轴上设置有一转轮。The release structure is that a rotating wheel is arranged coaxially with the clamping shaft.

所述解除结构是在卡制轴的周缘设置有齿部，并设置有一与卡制轴的齿部相啮合传动的推杆。The release structure is that a tooth portion is provided on the periphery of the clamping shaft, and a push rod that is engaged with and driven by the tooth portion of the clamping shaft is provided.

所述两内隔片间设置有隔块，使两内隔片得以呈间隔设置，在靠近刀部的隔块上还设置有一斜向贯穿隔块并与刀部相对的螺孔，在螺孔内螺设一可抵靠于刀部的调整螺栓，在刀部上形成有供调整螺栓抵靠的抵缘。A spacer is provided between the two inner spacers so that the two inner spacers can be arranged at intervals, and a screw hole obliquely penetrating through the spacer and opposite to the knife portion is provided on the spacer near the knife portion. The inner screw is provided with an adjusting bolt that can lean against the knife portion, and an abutting edge for the adjusting bolt to lean against is formed on the knife portion.

所述刀柄的其中一内隔片上设置有一受弹簧顶持的定位珠，并在刀部相对的位置上凹设有一可供定位珠卡入其中的定位槽。One of the inner partitions of the knife handle is provided with a positioning bead supported by a spring, and a positioning groove for the positioning bead to be inserted is recessed at the position opposite to the knife portion.

所述两内隔片的相对外侧各设置有一外壳片，在位于锁件解除结构同侧的外壳片上，凹设形成有一与解除结构相对且延伸至外壳片周缘的开槽，在位于复位弹簧同侧的外壳片上，凹设形成有一能容纳复位弹簧的容槽。The opposite outer sides of the two inner spacers are respectively provided with a shell piece, and on the shell piece located on the same side as the release structure of the lock piece, a slot opposite to the release structure and extending to the periphery of the shell piece is formed concavely. On the shell sheet on the side, a recessed groove is formed to accommodate the return spring.

本实用新型与现有技术相比，其优点和使用效果非常明显。由以上的技术方案可知，本实用新型的折叠刀将刀部枢设于两间隔设置的内隔片上，在两内隔片上设置一可与刀部相互卡制的锁件，藉此可使刀部在展开使用时，具有良好且稳固的展开定位效果，并且刀部在切割物品或受到外力时，亦不会任意相对刀柄转动收折，可提高刀具的使用安全性。其次，本实用新型可在拨动锁件上的拨柄后，解除卡制轴与刀具间的卡制关系，使刀具收叠折合，由此提高刀具折叠使用的便利性。Compared with the prior art, the utility model has very obvious advantages and effects. It can be seen from the above technical solutions that the folding knife of the utility model pivotally sets the knife part on two inner partitions arranged at intervals, and a lock piece that can be interlocked with the knife part is arranged on the two inner partitions, so that the knife can be locked. When the part is unfolded for use, it has a good and stable unfolding and positioning effect, and when the knife part is cutting objects or receiving external force, it will not rotate and fold relative to the handle arbitrarily, which can improve the safety of the knife. Secondly, the utility model can release the clamping relationship between the clamping shaft and the cutter after the toggle handle on the lock is turned, so that the cutter can be folded and folded, thereby improving the convenience of folding the cutter.

下面结合附图进一步说明本实用新型的具体结构。Further illustrate the concrete structure of the present utility model below in conjunction with accompanying drawing.

图1是本实用新型的立体外观图。Fig. 1 is a perspective view of the utility model.

图2是本实用新型的立体分解图。Fig. 2 is a three-dimensional exploded view of the utility model.

图3是本实用新型展开使用时的剖视示意图。Fig. 3 is a schematic cross-sectional view of the utility model when deployed.

图4是本实用新型收折时的剖视示意图。Fig. 4 is a schematic cross-sectional view of the utility model when it is folded.

图5是本实用新型的剖视示意图。Fig. 5 is a schematic cross-sectional view of the utility model.

图6是本实用新型刀部展开角度调整结构的剖视示意图。Fig. 6 is a schematic cross-sectional view of the blade deployment angle adjustment structure of the present invention.

图7是本实用新型刀部定位结构的局部剖视示意图。Fig. 7 is a partial cross-sectional schematic diagram of the knife positioning structure of the present invention.

图8是本实用新型另一实施例展开使用时的剖视示意图。Fig. 8 is a schematic cross-sectional view of another embodiment of the present invention when deployed.

图9是本实用新型另一实施例收折时的剖视示意图。Fig. 9 is a schematic cross-sectional view of another embodiment of the utility model when it is folded.

图10是本实用新型又一实施例的局部剖视示意图。Fig. 10 is a schematic partial cross-sectional view of another embodiment of the present invention.

图11是本实用新型再一实施例的局部剖视示意图。Fig. 11 is a schematic partial cross-sectional view of yet another embodiment of the utility model.

参看图1和图2，本实用新型的一种折叠刀包括一刀部10及一刀柄，刀部10是以一枢轴枢设于刀柄上，刀部10主要形成有一刀刃部，并在刀部10与刀柄相枢设的一端形成一圆弧形的弧部102。刀柄主要是由两相间隔设置的内隔片12、13所组成，在两内隔片12、13间设置有隔块16、162，使两内隔片12、13得以呈间隔状地设置。在刀部10位于弧部102顶缘的位置上凹设有一卡制凹槽104，在两内隔片12、13上设置有一可卡抵于刀部10卡制凹槽104的锁件20，如此便可通过该锁件20使刀部10在展开时，得以与刀柄间呈稳固的定位状态，而不致于任意相对转动收折。Referring to Fig. 1 and Fig. 2, a kind of folding knife of the present utility model comprises a knife part 10 and a handle of a knife, and the knife part 10 is pivotally arranged on the handle of a knife with a pivot, and the knife part 10 mainly forms a blade part, and on the knife An arc-shaped arc portion 102 is formed at one end of the pivoting portion 10 and the knife handle. The knife handle is mainly composed of two inner spacers 12 and 13 arranged at intervals, and spacers 16 and 162 are arranged between the two inner spacers 12 and 13, so that the two inner spacers 12 and 13 can be arranged in a spaced manner. . A clamping groove 104 is recessed at the position where the knife portion 10 is located at the top edge of the arc portion 102, and a lock 20 that can be clamped against the clamping groove 104 of the knife portion 10 is provided on the two inner partitions 12, 13. In this way, when the knife part 10 is unfolded, the lock part 20 can be in a stable positioning state with the knife handle, so as not to be arbitrarily rotated and folded.

锁件20主要是设置有一垂直穿设于两内隔片12、13间，且可相对卡入刀部10卡制凹槽104中的卡制轴22，在卡制轴22位于两内隔片12、13间的位置处轴向凹设形成有一可与刀部10的卡制凹槽104相对的让槽222。在锁件20上设置有一可带动卡制轴22转动的解除结构，该解除结构可如图1和图2所示，为一体成型于卡制轴22上的拨柄24，拨柄24的自由端延伸外露于刀柄外侧，让使用者能通过拨动拨柄24来带动卡制轴22转动。在卡制轴22上设置有一复位弹簧30，复位弹簧30的两端分别连结定位于卡制轴22及一内隔片13所设置的弹簧勾槽132上，藉此可利用该复位弹簧30来提供卡制轴22一份复位时所需的回复弹力，并让卡制轴22未形成让槽222的部份，在刀部10相对刀柄展开时，卡入刀部10的卡制凹槽104中。The lock 20 is mainly provided with a locking shaft 22 that is vertically penetrated between the two inner partitions 12 and 13 and can be relatively snapped into the locking groove 104 of the knife portion 10. The locking shaft 22 is located in the two inner partitions. The position between 12 and 13 is axially recessed to form a relief groove 222 that can be opposite to the locking groove 104 of the knife portion 10 . A release structure that can drive the locking shaft 22 to rotate is provided on the lock piece 20. As shown in Figures 1 and 2, the lifting structure is integrally formed on the handle 24 on the locking shaft 22, and the handle 24 is free. The extended end is exposed on the outside of the knife handle, so that the user can drive the clamping shaft 22 to rotate by turning the dial 24 . A return spring 30 is arranged on the clamping shaft 22, and the two ends of the return spring 30 are respectively connected and positioned on the spring hook groove 132 provided by the clamping shaft 22 and an inner partition 13, whereby the return spring 30 can be used to Provide the clamping shaft 22 with the required recovery force when it is reset, and let the clamping shaft 22 not form the part of the groove 222, when the knife part 10 is expanded relative to the handle, it will be stuck into the clamping groove of the knife part 10 104 in.

由此便可利用锁件20的卡制轴22与刀部10的卡制凹槽104进行相互卡制，如图2和图3所示，使刀部10在相对刀柄展开时，得以稳固定位，供使用者切割物品之用。此时，由于卡制轴22受到复位弹簧30的限制，如图5所示，卡制轴22并不会任意地转动，而能保持与刀部10间良好的卡制关系，所以纵然在刀具使用过程中，刀部10的刀背受到较大的外力时，刀部10仍可保持与刀柄间良好的定位关系，而不会任意地相对转动而收折，提高了刀具使用的安全性。Thus, the clamping shaft 22 of the lock 20 and the clamping groove 104 of the knife part 10 can be used to lock each other, as shown in Figures 2 and 3, so that the knife part 10 can be stabilized when it is unfolded relative to the knife handle. Positioning for users to cut objects. At this time, because the clamping shaft 22 is restricted by the return spring 30, as shown in Figure 5, the clamping shaft 22 will not rotate arbitrarily, but can maintain a good clamping relationship with the knife portion 10, so even if the knife During use, when the knife back of the knife part 10 is subjected to a large external force, the knife part 10 can still maintain a good positioning relationship with the handle of the knife, and will not be folded by relative rotation arbitrarily, which improves the safety of the knife in use.

当欲收折折叠刀时，可拨动锁件20上的拨柄24，配合参看图2和图4，使拨柄24带动卡制轴22转动，而让卡制轴22上的让槽222与刀部10的卡制凹槽104相对，如此便可解除卡制轴22与刀部10卡制凹槽104间的卡制关系，使刀部10恢复可相对刀柄转动的状态。而相对刀柄转动收折，并将刀部10收折容纳于两内隔片12、13间，不仅可缩小刀具的整体体积，以利刀具的携带与收藏，而且可使刀部10的刀刃部作隐藏式地收纳，避免人员为其所割伤，进一步提高了刀具使用的安全性。When you want to fold the folding knife, you can turn the handle 24 on the lock 20, and refer to Fig. 2 and Fig. Opposite to the clamping groove 104 of the knife part 10, the clamping relationship between the clamping shaft 22 and the clamping groove 104 of the knife part 10 can be released in this way, so that the knife part 10 can return to the state of being able to rotate relative to the handle. Rotate and fold relative to the handle of the knife, and fold and accommodate the knife portion 10 between the two inner partitions 12, 13, not only can reduce the overall volume of the knife, and facilitate the carrying and storage of the knife, but also make the blade of the knife portion 10 The part is stored in a hidden way to avoid people being cut by it, which further improves the safety of knife use.

当欲重新使用刀具时，配合参看图3、图4和图5，可相对刀柄转动刀部10，待刀部10转动至近展开的位置，并且刀部10与卡制轴22相接触时，由于刀部10上形成有一圆弧形的弧部102，因此该弧部102会推顶卡制轴22，使卡制轴22转动而令其让槽222转动至与刀部10相对的位置，并自动形成一供刀部10转动通过的通道，待刀部10转动至展开的位置，而使其卡制凹槽104与让槽222相对时，卡制轴22便会因失去弧部102推顶的力量及透过复位弹簧30的回复弹力而回转，使让槽222转离与刀部10卡制凹槽104相对的位置，并让卡制轴22未形成让槽222的部份卡制于刀部10的卡制凹槽104中，如此便可在不需另行拨动拨柄24的情况下，快速且方便地使刀部10相对刀柄展开使用并定位，以此来提高刀具使用的便利性。When wanting to reuse the tool, referring to Fig. 3, Fig. 4 and Fig. 5, the knife part 10 can be rotated relative to the handle of the knife, and when the knife part 10 is rotated to a nearly unfolded position, and the knife part 10 is in contact with the clamping shaft 22, Since an arc-shaped arc portion 102 is formed on the knife portion 10, the arc portion 102 will push the clamping shaft 22 to rotate the clamping shaft 22 so that the groove 222 is rotated to a position opposite to the knife portion 10, And automatically form a passage for the rotation of the knife portion 10. When the knife portion 10 is rotated to the unfolded position, and when the locking groove 104 is opposite to the letting groove 222, the locking shaft 22 will be pushed away due to the loss of the arc portion 102. The strength of the top and the return elastic force of the return spring 30 allow the groove 222 to rotate away from the position opposite to the clamping groove 104 of the knife portion 10, and allow the clamping shaft 22 not to form a part of the clamping groove 222. In the clamping groove 104 of the knife part 10, the knife part 10 can be deployed and positioned relative to the handle of the knife quickly and conveniently without the need to additionally toggle the handle 24, so as to improve the use of the knife convenience.

在两内隔片12、13间所设置靠近刀部10的隔块16上，配合参看图2和图6，可设置一斜向贯穿隔块16并与刀部10相对的螺孔164，在螺孔164内螺设一沉头式调整螺栓166，在刀部10相对于隔块16的部位上可相对形成斜向的抵缘108，如此当将刀部10展开使用时，可让刀部10的抵缘108抵靠于调整螺栓166的端部上，使刀部10定位于某一相对刀柄展开的位置及角度上，而当转动调整螺栓166，使调整螺栓166相对螺孔164伸缩移动时，则可改变调整螺栓166所能抵靠刀部10抵缘108的位置，进而改变刀部10相对刀柄展开的角度，使刀具的使用更具有弹性和实用性。On the spacer 16 provided between the two inner spacers 12 and 13 close to the knife portion 10, referring to Fig. 2 and Fig. 6, a screw hole 164 obliquely penetrating through the spacer 16 and opposite to the knife portion 10 can be set. A countersunk head type adjusting bolt 166 is screwed inside the screw hole 164, and an oblique abutment 108 can be relatively formed at the position of the knife portion 10 relative to the spacer 16, so that when the knife portion 10 is deployed for use, the knife portion can The abutting edge 108 of 10 leans against the end of the adjusting bolt 166, so that the knife portion 10 is positioned at a certain position and angle relative to the handle of the knife, and when the adjusting bolt 166 is turned, the adjusting bolt 166 is stretched relative to the screw hole 164 When moving, the position where the adjusting bolt 166 can abut against the edge 108 of the knife portion 10 can be changed, thereby changing the angle at which the knife portion 10 expands relative to the handle of a knife, so that the use of the knife is more flexible and practical.

在刀柄其中一内隔片12上设置有一受弹簧182所顶持的定位珠18，配合参看图2和图7，在刀部10相对的位置处凹设有一定位槽106，当将刀部10收折容纳于两内隔片12、13间时，可让定位珠18卡入相对的定位槽106中，以次提供收折后的刀部10一份定位的效果。在两内隔片12、13相对外侧可再分别设置一外壳片14、15，配合参看图1和图2，其中两外壳片14、15可配合螺栓而组设于两内隔片12、13上，如此可藉两外壳片14、15来提供刀具一份保护与装饰的效果。在位于锁件20拨柄24同侧的外壳片14上，凹设形成有一与拨柄24相对且延伸至外壳片14周缘的开槽142，如此可在将外壳片14组设于内隔片12上时，利用开槽142来容置拨柄24，并让拨柄24的自由端由开槽142的开口穿出，使外壳片14得以平整地组设于内隔片12上，而不会产生任何间隙。同时在位于复位弹簧30同侧的外壳片15上，凹设形成一能容纳复位弹簧30的容槽152，如此亦可使外壳片15与内隔片13无间隙的紧密结合。One of the inner spacers 12 of the knife handle is provided with a positioning bead 18 supported by a spring 182. Referring to Fig. 2 and Fig. 7, a positioning groove 106 is recessed at the position opposite to the knife portion 10. When the knife portion When the 10 is folded and accommodated between the two inner spacers 12 and 13, the positioning beads 18 can be snapped into the relative positioning grooves 106, so as to provide a positioning effect for the folded knife portion 10. A shell piece 14,15 can be arranged respectively on the relative outer sides of the two inner spacers 12,13, see Fig. 1 and Fig. In this way, the two shell sheets 14, 15 can be used to provide a protection and decoration effect for the cutter. On the shell piece 14 on the same side as the dial handle 24 of the lock piece 20, a slot 142 opposite to the dial handle 24 and extending to the periphery of the shell piece 14 is recessed, so that the shell piece 14 can be assembled on the inner partition 12, utilize the slot 142 to accommodate the dial handle 24, and allow the free end of the dial handle 24 to pass through the opening of the slot 142, so that the shell sheet 14 can be smoothly assembled on the inner partition sheet 12 without Any gaps will be created. Simultaneously, on the shell sheet 15 on the same side as the return spring 30 , a recessed groove 152 capable of accommodating the return spring 30 is formed, so that the shell sheet 15 and the inner septum 13 can be closely combined without gaps.

其次，在锁件20的卡制轴22上可径向凸设形成一卡制杆224，配合参看图8，卡制杆224的自由端于刀部10相对刀柄展开时，卡入刀部10上相对设置的卡制凹槽104中，如此亦可利用卡制凹槽104与卡制杆224间的相对卡制，使刀部10得以稳固定位于展开使用的位置上。当拨动拨柄24，进而带动卡制轴22转动时，可使卡制杆224移开与卡制凹槽104相卡制的位置，如图9所示，使刀部10能相对刀柄转动而收折容纳于刀柄之中。Secondly, a clamping rod 224 can be radially protruded on the clamping shaft 22 of the lock member 20. Referring to FIG. In the locking groove 104 oppositely arranged on the blade 10, the relative locking between the locking groove 104 and the locking rod 224 can also be used in this way, so that the knife part 10 can be stably fixed on the position for deployment. When the toggle handle 24 is turned to drive the clamping shaft 22 to rotate, the clamping rod 224 can be moved away from the position clamped with the clamping groove 104, as shown in Figure 9, so that the knife portion 10 can be moved relative to the handle of a knife Turn and fold to accommodate in the handle.

锁件20上所设置的解除结构可参看图10，在卡制轴22的同轴上设置一转轮26，通过转动转轮26来使卡制轴22上的让槽222与刀部10的卡制凹槽104相对，或者使卡制轴22上的卡制杆224(如图8和图9所示)移开与卡制凹槽104相卡制的位置，让刀具得以顺利收折。在卡制轴22的周缘可设置齿部，配合参看图11，再设置一可相对刀柄横向移动的推杆28，推杆28上设置有与卡制轴22齿部相啮合的齿部，藉此可在横向推动推杆28时，利用两相啮合的齿部使卡制轴22转动，以解除卡制轴22与刀部10间的卡制关系，藉此扩大本实用新型的适用范围。The release structure provided on the lock piece 20 can be referred to FIG. The clamping groove 104 is opposite, or the clamping rod 224 (as shown in FIG. 8 and FIG. 9 ) on the clamping shaft 22 is moved away from the position clamped with the clamping groove 104, so that the cutter can be folded smoothly. A tooth portion can be set on the periphery of the clamping shaft 22. Referring to FIG. 11, a push rod 28 that can move laterally relative to the handle of a knife is provided. Thereby, when pushing the push rod 28 laterally, the locking shaft 22 can be rotated by using the two-phase meshing teeth, so as to release the locking relationship between the locking shaft 22 and the knife portion 10, thereby expanding the scope of application of the present utility model .