CN201042802Y

CN201042802Y - Folding knife

Info

Publication number: CN201042802Y
Application number: CNU2007201436136U
Authority: CN
Inventors: 高志成
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-17
Filing date: 2007-04-17
Publication date: 2008-04-02
Anticipated expiration: 2017-04-17

Abstract

The utility model relates to a jack knife, which comprises a knife handle with one end passing through a pivot shaft; a knife body with one end far from its knifepoint where the pivot shaft is connected inside the knife handle; an elastic component which is pivoted inside the knife handle and whose one end extends toward the position of the pivot shaft that the knife body approaches and whose other end extends toward the position near the anther end of the knife handle along the direction far from the pivot shaft; a sliding block actively arranged inside the knife handle and used to push anther end of the elastic component after force bearing and moving toward one direction inside the knife handle from the position of anther end of the adjacent elastic component. When the knife body is totally contained inside the knife handle, one end of the elastic component can be closely against the position on the knife body near the pivot shaft. In addition, the sliding block can move toward a reversed direction after force bearing to release anther end of the elastic component so that one end of the elastic component is not closely against the position on the knife body near the pivot shaft.

Description

Jack knife

Technical field

The utility model relates to a kind of jack knife, refers in particular to a kind of jack knife that is provided with a cutter hub and a handle of a knife, and this jack knife can be set this cutter hub and eject in handle of a knife, or manually produces.

Background technology

Press, because the progress of science and technology is maked rapid progress, and people also improve constantly for the requirement of quality of life, make all trades and professions be devoted to research and development upgrades always, more progressive product, to produce effect more easily, and this trend not only is confined to the high-tech product field, connect the closely bound up articles for daily use of living with people, the complaint of and poor design not convenient to it by people, also modified and significantly improve its convenience and progressive, make each manufacturer when carrying out product design, there's no one who doesn't or isn't with better quality of life, function is as shaping-orientation more easily, and wherein a kind of switchblade of amounting to is not only of many uses, easy to carry, and have purposes widely during stress-relieving activity out of doors, welcome by the fan of outdoor leisure activity.

See also shown in Figure 1, the primary structure of this kind switchblade 1 comprises a hollow lever 10 and a cutter hub 11, wherein this cutter hub 11 is hubbed in this hollow lever 10, and a side of this hollow lever 10 is provided with a breach 100, use for cutter hub 11 from hollow lever 10, to come out, this cutter hub 11 is provided with an articulated section 121 in the position with these hollow lever 10 pivot joints, and this cutter hub 11 is in the part of contiguous this articulated section 121 of a side that is positioned at its blade 110, be provided with a draw-in groove 111, and this hollow lever 10 is provided with a pivot 12 in the position with these cutter hub 11 pivot joints, this pivot 12 just can be articulated with this articulated section 121, and be positioned at the position of these pivot 12 peripheries in this hollow lever 10, still be provided with an elastic parts 13 that joins with this cutter hub 11, again, the position of adjacent this pivot 12 in this hollow lever 10, be provided with and cooperate these draw-in groove 111 blockings or discharge this cutter hub 11, and protrude from a push switch 14 on these hollow lever 10 surfaces, when pushing this push switch 14, can untie the blocking of 14 pairs of these cutter hubs 11 of this push switch, make this cutter hub 11 be able to elastic force by this elastic parts 13, eject outside this hollow lever 10 rapidly, in other words, only need the one hand can be rapidly and easily operate this switchblade 1.

But above-mentioned known switchblade 1 has following shortcoming in the use:

1, see also shown in Figure 1 again, this push switch 14 is convexly set in the position that appears on these hollow lever 10 surfaces, easily under careless or situation that children play, touched and make this cutter hub 11 be released ejection, thereby cause the danger of being hurt, make former the design's kindness, become another kind of crisis on the contrary, again, because this elastic parts 13 of this switchblade 1 has elastic force,, therefore cause this switchblade 1 to be positioned in user's the pocket also though this cutter hub 11 is promptly ejected outside this hollow lever 10, very easily because of the slightly careless collision of external force, and this cutter hub 11 is screwed out in this hollow lever 10 suddenly, and then cause the tragedy that hurts or stab user's health, though this switchblade 1 has increased the convenience that uses, but the user is produced great danger, also do not met comparatively rigorous safety requirement; And

2, see also again shown in Figure 1, this switchblade 1 can only have a kind of function that ejects this cutter hub 11, so, misgivings on safety, need temporarily avoid after pushing this push switch 14, make this cutter hub 11 in this hollow lever 10, eject, and desire is when ejecting the function cancellation of this cutter hub 11 with this switchblade 1, the user makes the user produce not convenient greatly and puzzlement with at one's wit's end.

In sum, how to design a kind of jack knife of innovation, improve the multiple shortcoming of the traditional switchblade that can amount to, it is convenient, safer more to allow the user use, and promptly becomes at present the manufacturer that respectively makes, designs jack knife, desires most ardently an important topic of solution.

The utility model content

The purpose of this utility model is to provide a kind of jack knife, to overcome the defective that exists in the known technology.

For achieving the above object, the jack knife that the utility model provides, it comprises:

One handle of a knife, the one end is equipped with a pivot;

One cutter hub, at the end away from its point of a knife, this pivot is articulated in this handle of a knife; One elastic parts is hubbed in this handle of a knife, and the one end extends to the position of contiguous this pivot of this cutter hub, and the end in addition of this elastic parts extends to contiguous this handle of a knife position of end in addition then towards the direction away from this pivot; And

One slide block, be located at versatilely in this handle of a knife, the position of end in addition in adjacent this elastic parts, this slide block can move towards a direction in this handle of a knife after stressed, in order to promote the end in addition of this elastic parts, make when this cutter hub is taken in fully to this handle of a knife, one end of this elastic parts can closely be resisted against the position of contiguous this pivot on this cutter hub, in addition, this slide block also can move towards a rightabout in stressed back, in order to discharge the in addition end of this elastic parts, make the unlikely position that closely is resisted against contiguous this pivot on this cutter hub of an end of this elastic parts.

Described jack knife, wherein this slide block is provided with a flange part, and this flange part extends outside this handle of a knife by in this handle of a knife.

Described jack knife, wherein this handle of a knife is provided with a peristome in the position of relative this flange part.

Described jack knife, wherein this handle of a knife is provided with a spacing cylinder at the end in addition of contiguous this elastic parts back to the position of this slide block.

Described jack knife, holding in addition in the face of the part of this spacing cylinder of this elastic parts wherein is provided with a recessed edge portion, and this recessed edge portion be able to hold this spacing cylinder.

Described jack knife, wherein the knife back of this cutter hub is provided with a pushing part, and this pushing part protrudes from this handle of a knife.

Described jack knife, wherein the side of this handle of a knife is provided with a breach in the position of contiguous this pivot, and this breach extends to the end in addition of this handle of a knife, and the end in addition of this handle of a knife is provided with a stop tab along this breach again, and an end of this stop tab extends to the position of adjacent this cutter hub.

In other words, the jack knife that provides of the utility model has following structure and effect:

The utility model comprises a handle of a knife and a cutter hub, wherein an end of this handle of a knife is equipped with a pivot, and this cutter hub is hubbed in this handle of a knife by this pivot, this jack knife still is provided with an elastic parts and a slide block again, wherein this elastic parts is hubbed in this handle of a knife, one end of this elastic parts extends to the position of contiguous this pivot of this cutter hub, and the end in addition of this elastic parts is then towards the direction away from this pivot, extend to this handle of a knife position of end in addition, and this slide block is located in this handle of a knife versatilely, the position of end in addition in adjacent this elastic parts, the direction of utilizing this slide block in this handle of a knife, to move, in the time of can be in this cutter hub be accommodated in this handle of a knife, an end of controlling this elastic parts is resisted against the state of the position of contiguous this pivot on this cutter hub, when the position of this elastic parts and contiguous this pivot of this cutter hub leans, this elastic parts can produce an active force that ejects to this cutter hub outside this handle of a knife, and when the position of this elastic parts and contiguous this pivot of this cutter hub does not lean, this elastic parts promptly can't produce the active force that outwards ejects to this cutter hub, only can utilize and manually produce this cutter hub, so, solving known jack knife can't can eject in handle of a knife automatically according to this cutter hub of requirements set, or the problem that manually produces.

The utility model provides jack knife, be set in this cutter hub and can eject the function of this handle of a knife automatically, and when this cutter hub is amounted to fully in this handle of a knife, one end of this elastic parts just can be pressed on the position of contiguous this pivot of this cutter hub, and this elastic parts can produce an active force that rotates to this cutter hub in this handle of a knife, make stable being accommodated in this handle of a knife of this cutter hub, and when this cutter hub outwards turns to a predetermined angular gradually in this handle of a knife, this elastic parts could produce the active force that outwards ejects to this cutter hub, promoting this cutter hub ejects outside this handle of a knife, so, can prevent that this cutter hub from because of vibration or the collision danger of ejection immediately accidentally, increasing the security of this jack knife.

Description of drawings

Fig. 1 is the stereogram of known switchblade;

Fig. 2 is an embodiment exploded view of the utility model jack knife;

Fig. 3 is an embodiment stereogram of the utility model jack knife;

Fig. 4 is an embodiment perspective view of the utility model jack knife;

Fig. 5 is another perspective view of an embodiment of the utility model jack knife; And

Fig. 6 is another enforcement exploded view of the utility model jack knife.

The specific embodiment

For doing further understanding and understanding,, be described in detail as follows for the embodiment conjunction with figs. to the purpose of this utility model, shape, constructing apparatus feature and effect thereof:

The utility model is a kind of jack knife, in a preferred embodiment of the present utility model, see also Fig. 2 and shown in Figure 3, this jack knife 2 is provided with a handle of a knife 20 and a cutter hub 21, wherein this handle of a knife 20 comprises one first plate body 200, one second plate body 201, one the 3rd plate body 202 and one the 4th plate body 203, these plate bodys 200,201,202,203 stack togather in regular turn mutually, and these plate bodys 200,201,202, an end of 203 is equipped with a pivot 204, and this cutter hub 21 is at the end away from its point of a knife 210, be articulated between this second plate body 201 and the 3rd plate body 202 by this pivot 204, and between these second plate body, 201 two ends in the face of the position of this first plate body 200, be pivoted with an elastic parts 23, this elastic parts 23 can in order to drive this cutter hub 21 eject these handle of a knifes 20 outside, in addition between this first plate body 200 and this second plate body 201 in the position of adjacent this elastic parts 23, still be provided with a slide block 24 versatilely, this slide block 24 can be in order to control the state that matches between this elastic parts 23 and this cutter hub 21, make this elastic parts 23 to eject outside this handle of a knife 20 in order to promote this cutter hub 21, perhaps, making this elastic parts 23 can't promote this cutter hub 21 ejects outside this handle of a knife 20, making this cutter hub 21 can only utilize manually produces in this handle of a knife 20, so, the user can be according to hobby or custom, by stirring this slide block 24, select whether to allow this jack knife 2 have the function that ejects this cutter hub 21, significantly promoted the convenience and the security of this jack knife 2.

In a preferred embodiment of the present utility model, see also Fig. 2 and shown in Figure 3, wherein this second plate body 201 is provided with a spacing hole 301 in the position of contiguous this pivot 204, and this spacing hole 301 is the center with this pivot 204, position by contiguous this elastic parts 23, the direction bending of producing with this cutter hub 21 extends to form arcuation, and this cutter hub 21 is in contiguous this pivot 204 and the position of this spacing hole 301 relatively, be provided with one and lead post 214, this is led post 214 and extends between this first plate body 200 and this second plate body 201 by this spacing hole 301, an end of this elastic parts 23 extends to the position that this leads post 214 in addition, and the end in addition of this elastic parts 23 is then towards the direction away from this pivot 204, extend to contiguous this handle of a knife 20 position of end in addition, and these slide block 24 shapes triangular in shape, and this slide block 24 leans in a side of hypotenuse and a side of end in addition of this elastic parts 23, under the state in this cutter hub 21 is accommodated in this handle of a knife 20, when this slide block 24 moves towards the direction away from this pivot 204 (as shown in Figure 4), this slide block 24 will be resisted against this elastic parts 23 in addition end away from the position of this pivot 204, make an end of this elastic parts 23 be resisted against the periphery that this leads post 214 closely, so, this elastic parts 23 can be led post 214 to this and be produced a promotion elastic force, drives this cutter hub 21 and ejects outside these handle of a knifes 20.Otherwise, when this slide block 24 (as shown in Figure 5) when the direction of contiguous this pivot 204 moves, this slide block 24 will be resisted against this elastic parts 23 end in addition, in the position that contiguous this elastic parts 23 and this second plate body 201 are articulated, make an end of this elastic parts 23 can't be resisted against the periphery that this leads post 214 closely, so, this elastic parts 23 promptly can't be led post 214 to this and be produced this promotion elastic force, only can this cutter hub 21 be produced outside this handle of a knife 20 with manual mode, make this jack knife 2 have and be adjusted into semi-automatic bullet cutter, or be adjusted into the function of manual pocket knife.

Moreover, in this embodiment, see also Fig. 2 again, 3, shown in 4 and 5, be set in the function that this cutter hub 21 can eject this handle of a knife 20 automatically at this jack knife 2, and when this cutter hub 21 is amounted to fully in this handle of a knife 20, one end of this elastic parts 23 just can be pressed on the periphery that this leads post 214, and this elastic parts 23 is led post 214 by this, can produce an active force that in this handle of a knife 20, rotates to this cutter hub 21, make this cutter hub 21 stable being accommodated in this handle of a knife 20, and when this cutter hub 21 outwards turns to a predetermined angular gradually in this handle of a knife 20, this elastic parts 23 could produce the active force that outwards ejects to this cutter hub 21, promotes this cutter hub 21 and ejects outside this handle of a knife 20, so, can prevent that this cutter hub 21 from because of vibration or the collision danger of ejection immediately accidentally, increasing the security of this jack knife 2.

In another preferred embodiment of the present utility model, see also Fig. 3 and shown in Figure 6, this jack knife 2 is provided with a handle of a knife 20, one cutter hub 21 and one is led portion 22, wherein this handle of a knife 20 comprises one first plate body 200, one second plate body 201, one the 3rd plate body 202 and one the 4th plate body 203, these plate bodys 200,201,202,203 stack togather in regular turn mutually, and these plate bodys 200,201,202, an end of 203 is equipped with a pivot 204, and this cutter hub 21 is at the end away from its point of a knife 210, be articulated between this second plate body 201 and the 3rd plate body 202 by this pivot 204, in addition this is led portion 22 and is articulated between this first plate body 200 and this second plate body 201 by this pivot 204, and this leads portion 22 rotation that can match with this cutter hub 21, and between these second plate body, 201 two ends in the face of the position of this first plate body 200, be pivoted with an elastic parts 23, this elastic parts 23 can drive outside these cutter hub 21 these handle of a knifes 20 of ejection in order to cooperate this to lead portion 22, in addition between this first plate body 200 and this second plate body 201 in the position of adjacent this elastic parts 23, still be provided with a slide block 24 versatilely, this slide block 24 can be led the state that matches between the portion 22 with this in order to control this elastic parts 23, making this elastic parts 23 can cooperate this to lead portion 22 drives outside these cutter hub 21 these handle of a knifes 20 of ejection, perhaps, make this elastic parts 23 can't cooperate this to lead portion 22, making this cutter hub 21 can only utilize manually produces in this handle of a knife 20, so, the user can be according to hobby or custom, by stirring this slide block 24, select whether to allow this jack knife 2 have the function that ejects this cutter hub 21, significantly promoted the convenience and the security of this jack knife 2.

In this embodiment, see also Fig. 3 and shown in Figure 6 again, one end of this elastic parts 23 extends to the position that this leads portion 22, and the end in addition of this elastic parts 23 is then towards the direction away from this pivot 204, extend to contiguous this handle of a knife 20 position of end in addition, and these slide block 24 shapes triangular in shape, and this slide block 24 leans in a side of hypotenuse and a side of end in addition of this elastic parts 23, under the state in this cutter hub 21 is accommodated in this handle of a knife 20, when this slide block 24 moves towards the direction away from this pivot 204, this slide block 24 will be resisted against this elastic parts 23 in addition end away from the position of this pivot 204, make an end of this elastic parts 23 be resisted against the periphery that this leads portion 22 closely, so, this elastic parts 23 can be led portion 22 to this and be produced a promotion elastic force, drives this cutter hub 21 and ejects outside these handle of a knifes 20.Anti-, when this slide block 24 when the direction of contiguous this pivot 204 moves, this slide block 24 will be resisted against this elastic parts 23 end in addition, in the position that contiguous this elastic parts 23 and this second plate body 201 are articulated, make an end of this elastic parts 23 can't be resisted against the periphery that this leads portion 22 closely, so, this elastic parts 23 promptly can't be led post 214 to this and be produced this promotion elastic force, only can this cutter hub 21 be produced outside this handle of a knife 20 with manual mode, make this jack knife 2 have and be adjusted into semi-automatic bullet cutter, or be adjusted into the function of manual pocket knife.

In this embodiment, see also Fig. 3 and shown in Figure 6 again, wherein this second plate body 201 is provided with a spacing hole 301 in the position of contiguous this pivot 204, and this spacing hole 301 is the center with this pivot 204, position by contiguous this elastic parts 23, the direction bending of producing with this cutter hub 21 extends to form arcuation, and this cutter hub 21 is in contiguous this pivot 204 and the position of this spacing hole 301 relatively, be provided with one first and lead moving cell 211, this first is led moving cell 211 and is one poroid, in addition this is led portion 22 and is provided with one second and leads moving cell 220 facing this first one side of leading moving cell 211, this second is led moving cell 220 and is a column, and this second is led moving cell 220 first to lead moving cell 211 is to be complementary with this, this second is led moving cell 220 and first leads moving cell 211 and extend to this again, and penetrate this spacing hole 301 and this first in regular turn and lead moving cell 211, so, this leads portion 22 can be in the scope of this spacing hole 301, by penetrate this first lead moving cell 211 this second lead moving cell 220 along with this cutter hub 21 rotates, perhaps, when this leads the effect that portion 22 is subjected to this promotion elastic force of this elastic parts 23, making that this leads portion 22 can be in the scope of this spacing hole 301, by penetrate this first lead moving cell 211 this second lead moving cell 220, in this handle of a knife 20, eject these cutter hubs 21.

In the foregoing description, these lead moving cell 211,220, (as: second to lead moving cell 220 be to be one poroid for this can to change enforcement according to these jack knife 2 practical design, and this first to lead moving cell 211 be to be a column, and first to lead moving cell 211 be second to lead moving cell 220 and extend to this for this, and penetrate this spacing hole 301 and this second in regular turn and lead moving cell 220), these lead moving cell 211 again, 220 shape not only can be the column that is complementary and poroid, it also can be changed according to these jack knife 2 practical design and implement different shapes, as long as lead moving cell 211 by these, 220, can make this cutter hub 21 and this lead portion 22 and match to rotate and get final product.

Moreover, in this embodiment, see also Fig. 3 and shown in Figure 6 again, be set in the function that this cutter hub 21 can eject this handle of a knife 20 automatically at this jack knife 2, and when this cutter hub 21 is amounted to fully in this handle of a knife 20, one end of this elastic parts 23 just can be pressed on the periphery that this leads portion 22, and this elastic parts 23 is led portion 22 by this, can produce an active force that in this handle of a knife 20, rotates to this cutter hub 21, make this cutter hub 21 stable being accommodated in this handle of a knife 20, and when this cutter hub 21 outwards turns to a predetermined angular gradually in this handle of a knife 20, this elastic parts 23 could produce the active force that outwards ejects to this cutter hub 21, promotes this cutter hub 21 and ejects outside this handle of a knife 20, so, can prevent that this cutter hub 21 from because of vibration or the collision danger of ejection immediately accidentally, increasing the security of this jack knife 2.

In above-mentioned these embodiment, see also Fig. 2 again, 4, shown in 5 and 6, the shape of this slide block 24 not only can be triangle, it can be changed according to these jack knife 2 practical design and implement different shapes, as long as can whether can eject this cutter hub 21 in order to control this elastic parts 23, again, the direction that this slide block 24 moves between this first plate body 200 and this second plate body 201, reach the position that this slide block 24 and this elastic parts 23 lean, also can change enforcement according to these jack knife 2 practical design, as long as make this jack knife 2 can pass through moving of this slide block 24, and, can whether can eject this cutter hub 21 and get final product in order to control this elastic parts 23 by cooperating between this slide block 24 and this elastic parts 23.

Moreover, in above-mentioned these embodiment, see also Fig. 2 again, shown in 3 and 6, this first plate body 200 is provided with a peristome 300 in the position away from this pivot 204, and this slide block 24 is in the position in the face of this peristome 300, be provided with a flange part 240, this flange part 240 protrudes from outside this first plate body 200 by this peristome 300, so, need adjust the position of this slide block 24 as the user, in order to this jack knife 2 is adjusted into semi-automatic bullet cutter, or when being adjusted into manual pocket knife, can directly adjust this slide block 24 by this flange part 240, this peristome 300 is that the position that makes this slide block 24 and this flange part 240 move can be limited again, make this slide block 24 and this flange part 240 only can in the opening scope of this peristome 300, move, avoid the excessive mobile damage that causes this adjustment function of this slide block 24 and this flange part 240.

In above-mentioned these embodiment, see also Fig. 2 again, 4, shown in 5 and 6, this second plate body 201 at the end in addition of contiguous this elastic parts 23 back to the position of this slide block 24, be provided with a spacing cylinder 302, and the end in addition of this elastic parts 23, in be provided with a recessed edge portion 305 in the face of the part of this spacing cylinder 302, this recessed edge portion 305 be able to hold this spacing cylinder 302, when this slide block 24 moves towards the direction away from this pivot 204, this slide block 24 will be resisted against this elastic parts 23 in addition end away from the position of this pivot 204, and this moment, this spacing cylinder 302 was just held by this recessed edge portion 305, when effectively increasing these elastic parts 23 these cutter hubs 21 of ejection, the stability of this promotion elastic force that is produced.In above-mentioned these embodiment, see also again shown in Fig. 2,3 and 6, wherein this cutter hub 21 is provided with a pushing part 213 at its knife back 212, in the time of in this cutter hub 21 is accommodated in this handle of a knife 20, this pushing part 213 protrudes from this handle of a knife 20, so, when the user desires to produce this handle of a knife 20, can pass through this pushing part 213, and rely on one hand just can grip this jack knife 2 simultaneously and this cutter hub 21 is produced this handle of a knife 20, significantly promote the convenience of this jack knife 2.

In above-mentioned these embodiment, consult Fig. 2 again, shown in 3 and 6, wherein the side of the 3rd plate body 202 is provided with a breach 303, this breach 303 extends away from the position of this pivot 204 to the 3rd plate body 202, and the 3rd plate body 202 is in the part away from this pivot 204, be provided with a stop tab 304 along this breach 303, one end of this stop tab 304 extends to the position of adjacent this cutter hub 21, and an end of this stop tab 304 system is resisted against on this cutter hub 21 movably, after this cutter hub 21 is produced this handle of a knife 20, these stop tab 304 proper backstops are at an end of this cutter hub 21, this cutter hub 21 is limited in outside this handle of a knife 20, and can't rotates this cutter hub 21 more arbitrarily, make this jack knife 2 of use that the user can be stable do actions such as cutting, moreover, when needs rotate when taking in this cutter hub 21 once more, be the outer rim that can compress this stop tab 304, make this stop tab 304 leave the position that compresses this cutter hub 21, no longer limit the rotation of this cutter hub 21, then this cutter hub 21 can be regained in this accommodation space again.

What deserves to be explained is, in above-mentioned these embodiment, see also Fig. 2, shown in 3 and 6, this handle of a knife 20 not only can be these plate bodys 200,201,202,203 form, it can change enforcement according to these jack knife 2 practical design, as long as can be in order to articulate this cutter hub 21, and this elastic parts 23 is in order to eject the mode of this cutter hub 21, also be not defined as on this cutter hub 21, be provided with for this elastic parts 23 against this lead post 214, perhaps, this jack knife 2 leads portion 22 this two for being provided with for this that cooperates that this elastic parts 23 ejects these cutter hubs 21, it can change enforcement according to these jack knife 2 practical design, as long as can use for this elastic parts 23 this cutter hub 21 is ejected.

Press, the above, it only is a specific embodiment of the utility model the best, only structural feature of the present utility model is not limited thereto, anyly be familiar with this technical staff in the utility model field, can think easily and variation or modification, all can be encompassed in the claim scope of the present utility model.

Claims

1. a jack knife is characterized in that, comprising:

One handle of a knife, the one end is equipped with a pivot;

One slide block, be located at versatilely in this handle of a knife, the position of end in addition in adjacent this elastic parts, this slide block can move towards a direction in this handle of a knife after stressed, promote the end in addition of this elastic parts, when this cutter hub is taken in fully to this handle of a knife, one end of this elastic parts can closely be resisted against the position of contiguous this pivot on this cutter hub, in addition, this slide block also moves towards a rightabout in stressed back, discharge the end in addition of this elastic parts, the unlikely position that closely is resisted against contiguous this pivot on this cutter hub of an end of this elastic parts.

2. jack knife as claimed in claim 1 is characterized in that wherein this slide block is provided with a flange part, and this flange part extends outside this handle of a knife by in this handle of a knife.

3. jack knife as claimed in claim 2 is characterized in that, wherein this handle of a knife is provided with a peristome in the position of relative this flange part.

4. jack knife as claimed in claim 1 is characterized in that, wherein this handle of a knife is provided with a spacing cylinder at the end in addition of contiguous this elastic parts back to the position of this slide block.

5. jack knife as claimed in claim 4 is characterized in that, holding in addition in the face of the part of this spacing cylinder of this elastic parts wherein is provided with a recessed edge portion, and this recessed edge portion be able to hold this spacing cylinder.

6. jack knife as claimed in claim 1 is characterized in that wherein the knife back of this cutter hub is provided with a pushing part, and this pushing part protrudes from this handle of a knife.

7. jack knife as claimed in claim 1, it is characterized in that, wherein the side of this handle of a knife is provided with a breach in the position of contiguous this pivot, this breach extends to the end in addition of this handle of a knife, the end in addition of this handle of a knife is provided with a stop tab along this breach again, and an end of this stop tab extends to the position of adjacent this cutter hub.