CN201271892Y - Art designing knife with automatic shrinkage blade - Google Patents

Abstract

The utility model relates to an art knife with the blade being capable of automatically retracted. The art knife comprises an outer casing, a blade, a pushing button, a slide plate, a slide plate pulling spring, a blade seat, a blade seat pulling spring, and a blade replace device, wherein, the blade can be glidingly contained in the outer casing; the pushing button can slide from back to forth and control the blade to extend out; the slide plate is contained in the outer casing, closed to the inner surface of a first upper casing, fixed on the pushing button, and can slide in the outer casing; one end of the slide plate pulling spring is fixed on the slide plate and the other end is fixed on the inner surface of the outer casing; the blade seat is contained in the outer casing, positioned between the slide plate and a second upper casing, and used for the blade to be installed. The art knife realizes the function that the blade can be automatically retracted into the casing body after the blade is separated from a cutting work piece and before a user releases a knife pushing button, and the blade can not accidentally moved back or forth during the cutting process, and the art knife has the advantages of simple structure, small volume and light weight.

Description

A kind of cutter with automatic contraction blade

Technical field

The utility model relates to a kind of cutter with automatic contraction blade, blade is contained in the shell of cutter, in particular, cutter of the present utility model blade leave be cut object after and the user discharge be used for releasing the push button of blade before, just can the automatic drawing back shell among.

Background technology

Cutter is a kind of hand tools commonly used, can be used for cutting such as wood, paper, leather, plastic sheet, electric wire or cardboard.Cutter generally all has the shell that is assembled by two and half shells.Shell both simultaneously also was used for holding blade as handle of a knife.Offer a slit on the shell, by the slit push button is installed, push button is used for moving blade.

In order to prevent injury personnel behind cutting object, some cutter has the blade of auto retractable.When this cutter discharges push button behind user's cutting object the withdrawal shell among.But, if the user is because notice is concentrated inadequately or relatively more clumsy and do not discharge push button timely after cutting, but finger is still by being pressed on the push button, so at this moment brandish this cutter with regard to hurt easily with person or other people.

At United States Patent (USP) 6,775, disclose a kind of cutting tool that is retractable into sheet that has in 911, the blade of this cutting tool the knife edge of blade leave be cut object after and the user of a clumsiness may scratch own or other people before, can be withdrawn among the shell automatically.The reduction of this cutting tool success the said danger in front, but also have some other shortcoming.The first, in cutting process, the recoil of a kind of axis along blade from the blade that stretches out to the shell direction sometimes can effect on the blade be arranged.This recoil might be that to move cutter to the cut workpiece direction unintentionally by the user caused.And in addition sometimes, the frictional force between blade and the workpiece cut open can be pulled out shell with blade during mobile handle of a knife because of cutting backward the user.Because in this cutting tool, be by a pars intermedia (Intermediate Portion 20) and a pair of branch (Branches 30a when blade stretches out, (the Interme diatePortion 40 of pars intermedia 30b), 42) frictional force and shell between are relatively-stationary, so when recoil greater than element frictional force the time blade just may move backward unexpectedly, and workpiece frictional force greater than element frictional force the time blade just may move forward unexpectedly.So the blade of this cutting tool is not very stable in cutting process.

The second, be installed in controlled moving member (Controllable Movement 26) structure more complicated on the shell (Sleeve 10) and controlled moving member and will rely on the setting of these two element elastic modelling quantity and skin-friction coefficient with the start that cooperates between the support member (Support Means 16).If the combination of controlled moving member and support member elastic modelling quantity and surface coefficient is improper, blade just may promote or be difficult to promote too easily.The complexity of structure and definite suitable elastic modelling quantity and coefficient of friction all can increase manufacturing cost.

The 3rd, the shape width that controlled moving member is square is bigger, the increase that bigger width is unnecessary the volume and weight of this cutting tool.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of cutter of blade auto retractable, its blade is after leaving cut workpiece and among the shell of just can withdrawing automatically before the user discharges the push broach push button, and the blade of this cutter in use can not move forward and backward, and is more stable.

Technical problem to be solved in the utility model provides a kind of cutter of blade auto retractable, and this cutter is simple in structure.

Technical problem to be solved in the utility model provides a kind of cutter of blade auto retractable, and this cutter width is narrower.

In order to solve the problems of the technologies described above, the cutter that the utility model provides a kind of blade to withdraw automatically, it includes a shell, a blade that slidably is contained within the shell, one along the shell push button that stretches out of control blade that can reciprocatingly slide, one is contained within the shell near the first upper casing inner surface and is fixed in the slide plate that push button can slide in the enclosure, one one end is fixed on the slide plate and the other end is fixed in the slide plate pulling spring on the inner surface of outer cover, one is contained in the blade bearing that is used to install blade within the shell between the slide plate and second upper casing, a blade bearing pulling spring, and a blade exchange device; Blade has a breach, and slide plate has one and rises to the bait and a following hook; Blade bearing has a upper notch, a lower convexity, a blade mount pad, a last fulcrum and a lower fulcrum; The blade mount pad has a rear end and a front end, and the rear end is fixed on the blade bearing by a riveting set, and front end has a side shoot and a blade is installed projection; Upper notch has a vertical plane; The front end of blade bearing pulling spring is fixed on the blade bearing and the rear end is fixed on the shell, and the rear end will be higher than front end; The blade exchange device is contained in the groove of offering on the shell, and can move back and forth in groove; The blade exchange device has a top and a slope that is formed on the described shell.

The beneficial effect that the utility model brought is that blade can not move forward and backward in cutting process unexpectedly after the realization blade leaves cut workpiece and in the function among the shell of just can withdrawing automatically before the user discharges the push broach push button.In addition, have rise to the bait and the slide plate of following hook can with the blade bearing co-operating with upper notch and lower convexity, the utility model has been realized the automatic drawing back of cutting back blade with better simply structure.Secondly, the width of the utility model cutter is narrower, thereby its volume and weight is minimized.

Description of drawings

Fig. 1 is the schematic perspective view of the preferred embodiment of the utility model cutter.

Fig. 2 is a three-dimensional explosive view embodiment illustrated in fig. 1.

Fig. 3 to Fig. 6 is the three-dimensional explosive view of part, demonstration be the course of work of preferred embodiment shown in Figure 1.

Fig. 7 a to Fig. 7 f is the schematic perspective view of the blade exchange device course of work.

Fig. 8 a and Fig. 8 b are the schematic perspective views of the blade mount pad course of work.And,

Fig. 9 is the three-dimensional explosive view of part embodiment illustrated in fig. 1.

The specific embodiment

With reference to figure 1 and Fig. 2, but it shows the preferred embodiment of the cutter 1 of the utility model blade automatic drawing back.Cutter 1 has one by one first upper casing 11, one second upper casing 12 and the shell 10 that lower casing 13 constitutes, a blade 20 that slidably is contained within the shell 10, one can reciprocatingly slide and control the push button 30 that blade 20 stretches out along shell 10, one is contained within the shell 10 near first upper casing, 11 inner surfaces and is fixed in the slide plate 40 that push button 30 can slide in shell 10, one one end is fixed on the slide plate 40 and the other end is fixed in the slide plate pulling spring 41 on the inner surface of outer cover, one is contained in the blade bearing 50 that is used to install blade 20 within the shell 10 between the slide plate 40 and second upper casing 12, a blade bearing pulling spring 54, and a blade exchange device 60.10 whiles of shell are as the container and the handle of a knife of blade.

As shown in Figure 2, shell 10 has an axis C, and blade 20 can slide along axis C.Slide plate 40 is affixed with push button 30, and when push button 30 was pushed forward, slide plate 40 also moved forward simultaneously.Slide plate pulling spring 41 is parallel with axis C basically and can after the user discharge push button 30 slide plate 40 be retracted.Slide plate 40 has one rises to the bait 42 (specifically can referring to Fig. 3 and Fig. 4) and a following hook 43.Slide plate 40 also can be provided with one or more rib 44, on the inner surface of first upper casing 11, can offer one or more chute (not shown) by corresponding rib 44, the stability when rib 44 slides and can guarantee that slide plate 40 slides with respect to first upper casing 11 in chute.

Blade bearing 50 can slide in shell 10 along axis C basically.Blade bearing 50 has 53, one of 57, one blade mount pads of 52, one backstops of 51, one lower convexity of a upper notch and goes up fulcrum 55 and a lower fulcrum 56.Blade mount pad 53 has a rear end and a front end, and the rear end is fixed on the blade bearing 50 by a riveting set 531, and front end has a side shoot 532 and a blade is installed projection 533.Blade install projection 533 can one after blade 20 is installed a breach 21 on the blade 20 fasten.Blade mount pad 53 is made such as steel by the material with certain elasticity and intensity.With reference to figure 5, the front end 541 of blade bearing pulling spring 54 is fixed on the blade bearing 50 and rear end 542 is fixed on the shell 10, and rear end 542 will be higher than front end 541.Get back to Fig. 2 and Fig. 3, upper notch 51 has a vertical plane 511.

With reference to figure 3, below will introduce the working method of the utility model cutter 1 in detail.At the stand-by state shown in Fig. 3, push button 30 and the slide plate 40 that is fixed on the push button 30 are pulled to a rearmost position and stay in this by slide plate pulling spring 41.Rising to the bait of slide plate 40 42 propped up on the vertical plane 511 of blade bearing 50 upper notch 51.Forward Fig. 4 again to, its demonstration be the duty of cutter 1.Push button 30 is pushed into an operating position by user's thumb.Being fixed in slide plate 40 on the push button 30 also resists slide plate pulling spring 41 simultaneously and moves forward.When slide plate 40 moved, rising to the bait of slide plate 40 42 promote the vertical plane 511 of upper notch 51, promote blade bearing 50 antagonism blade bearings pulling springs 54 simultaneously moved forward.

Further with reference to figure 5, as user during with the blade 20 cut workpiece (not shown) that stretch out, the point of a knife of blade 20 partly is subjected to a power P who makes progress, and this power P can promote last fulcrum 55 rotations around blade bearing 50 of blade 20 and blade bearing 50.When blade bearing 50 rotated, the vertical plane 511 of the upper notch 51 of blade bearing 50 can move along the D direction among the figure, and that leaves slide plate 40 rises to the bait 42, and the lower convexity 52 of blade bearing 50 begins to contact the following hook 43 of slide plate 40 and stopped by following hook 43 simultaneously.As long as push away and turn round 30 and pushed away by the user and to rest on the operating position, blade bearing 50 and blade 20 just the moving backward that is fixed on the blade bearing 50 all can be stopped by the following hook 43 of slide plate 40.Simultaneously, the rear portion 45 of slide plate 40 is blocked by the backstops 57 above the blade bearing 50, make blade bearing 50 can't with respect to slide plate 40 just push button 30 move forward.So it is blade 20 can not move forward and backward in cutting process unexpectedly, more stable in the cutting process.Because blade bearing pulling spring 54 is not parallel with the axis C of shell 10 since rear end 542 than front end 541 high formed inclinations, the above-mentioned rotation of blade bearing 50 is antagonism blade bearing pulling springs 54, therefore can spur at blade bearing and form a restoring force straight up on the spring 54.

As shown in Figure 6, in case blade 20 leaves workpiece after cutting, power P will disappear.Blade bearing 50 will blade bearing spur under the effect of the restoring force that spring 54 makes progress along with Fig. 5 in D side in the opposite direction around on fulcrum 55 rotate.In this rotates, the lower convexity 52 of blade bearing 50 will leave the following hook 43 of slide plate 40.When lower convexity 52 leaves down hook 43, blade bearing 50 will be got back to the stand-by state shown in the figure under blade bearing spurs the pulling of spring 54.So, can see the utility model cutter 1 blade 20 can blade 20 leave workpiece and user have a mind to discharge push button 30 retracting blades 20 before automatically among the withdrawal shell 10.

After blade bearing 50 rested on the spare space, the user can discharge push button 30.At this moment push button 30 and picture 40 will be spurred spring 41 by slide plate and pull back.In the process that slide plate 40 moves backward, rising to the bait of slide plate 40 42 will be along blade bearing 50 towards upper notch 51 be slided.When rising to the bait 42 when blade bearing 50 slides, blade bearing 50 will be risen to the bait 42 to be promoted to rotate around the 56 antagonism blade bearings pulling springs 54 of the lower fulcrum on it.When rising to the bait 42 through after the vertical planes 511 of upper notch 51, blade bearing 50 will blade bearing spur under the effect of upwards restoring force of spring 54 around on fulcrum 55 counter-rotatings.So just having returned to the stand-by state shown in Fig. 3, cutter 1 of the present utility model can prepare use next time.As shown in Figure 2, be close at blade bearing 50 on the surface of blade 20 a powerful magnet block 70 can also be installed, iron blade can not rocked after being installed on the blade mount pad 50.

With reference to figure 7a to Fig. 7 e, below will introduce the course of work of blade exchange device 60 in detail.Blade exchange device 60 is contained in the groove of offering on the shell 10, and can move back and forth along A shown in Fig. 1 and B direction in groove.Blade exchange device 60 has a upper end 62 and a button 61 that makes things convenient for the user to promote with thumb.As shown in Fig. 7 b, be formed with a sideslip bar 31 on the inner surface of push button 30.Sideslip bar 31 is fastened in the seam 121 that second upper casing, 12 upper edge axis C offer so that guarantee push button 30 reciprocatingly sliding along shell 10.Can also be provided with a secondary side draw runner 32 on the inner surface on push button 30 opposites.Secondary side draw runner 32 be fastened in the corresponding seam (not shown) that first upper casing, 11 upper edge axis C offer in case guarantee push button 30 along shell 10 more stable reciprocatingly slide.

With reference to figure 7d, the user can upwards promote 61 to operating positions of button along direction A, and in this position, the top 62 of button 61 moves up and passes seam 121.In this duty of blade exchange device 60, when the user promotes push button 30 forward, sideslip bar 31 will run into the top 62 of blade exchange device 60 and be withstood, shown in Fig. 7 e.Shown in Fig. 8 a, in this duty of button 61, the side shoot 532 of blade mount pad 53 just runs on first upper casing 11 slope 111 being provided with and blade and projection 533 is installed fastens with breach 21 on the blade 20.This moment, blade 20 can not be pulled out replacing.

Shown in Fig. 7 f, when the user was directed downwards 61 to replacings of promotion button position along B, the top 62 of button 61 also moved down and has shifted out seam 121.This moment, the user can be pushed into push button 30 position foremost, shown in Fig. 8 b, because blade mount pad 53 has certain elasticity, the side shoot 532 of blade mount pad 53 will move along the slope 111 of first upper casing 11, and this moves the front end that will make blade mount pad 53 and departs from blade bearing 50 and blade 20.When push button 30 is pushed to foremost, the skew of blade mount pad 53 front ends will just make blade that projection 533 is installed and leave the breach 21 of blade 20, remove with the fastening of blade 20 thereby make blade that projection 533 is installed.Blade 20 can be extracted and change from blade bearing 50 this moment.After replacing, the user can discharge that push button 30 back into the operating position with button 61 then so that use blade to cut.

Shown in Fig. 7 a to Fig. 7 c, on top 62 facing on the direction of push button 30 with at sideslip bar 31 facing to second snap ramp 311 that can be respectively equipped with one first snap ramp 621 and a correspondence on the direction of blade exchange device 60.Second snap ramp 311 is towards the inner surface of push button 30.If promoting push button 30, the user meets up to first and second snap ramp 621 and 311 forward, if continue to promote again this moment push button 30, the first snap ramp 621 will to second snap ramp 311 apply one with second snap ramp 311 towards opposite pressure.Since push button 30 generally be made of plastics and have certain elasticity, so if the push button of promotion forward 30 that the user continues, the two halves of push button 30 might separate and drop from shell 10.This pressure will help to prevent that push button 30 from dropping from shell 10.

Referring to figs. 2 and 9, on second upper casing 12, can also be provided with a spacing bumping post 122.When blade bearing pulling spring 54 pulled back blade bearing 50, the rear end 58 of blade bearing 50 finally can run into spacing bumping post 122, thereby blade bearing 50 can limited bumping post 122 stops and rests on the spare space.As previously mentioned, cutter 1 of the present utility model is before returning to stand-by state, and it is to rise to the bait 42 through after the vertical planes 511 of upper notch 51 that an action is arranged, blade bearing 50 will blade bearing spur under the effect of upwards restoring force of spring 54 around on fulcrum 55 counter-rotatings.Blade bearing pulling spring 54 needs the rear end 58 of antagonism blade bearing 50 and the frictional force between the spacing bumping post 122 during blade bearing 50 counter-rotatings.This frictional force can hinder resetting of blade bearing 50.In order to make this frictional force reduce to minimum, rear end 58 can be designed to the inclined-plane, and the face that contacts with rear end 58 on the spacing bumping post 122 also can be designed to inclined surface 123.

Known to those skilled in the art, drawings and Examples of the present utility model are only for illustrating that function of the present utility model, structure and principle should not become the restriction in the utility model understanding; Simultaneously, the purpose of this utility model all realizes.The foregoing description may be had some change under the situation that does not break away from the utility model principle, so protection of the present utility model should be as the criterion with the scope described in claims.

Claims (10)

1. the cutter that a blade can automatic drawing back is characterized in that including:

A shell (10);

A blade (20) that slidably is contained within the described shell (10), described blade (20) has a breach (21);

One can reciprocatingly slide and control the push button (30) that described blade (20) stretches out along described shell (10);

A slide plate (40) that is contained within the described shell (10), is fixed on the described push button (30) and can in described shell (10), slides, described slide plate (40) has one and rises to the bait (42) and a following hook (43);

One one end is fixed on the described slide plate (40) and the other end is fixed in the slide plate pulling spring (41) on described shell (10) inner surface;

One is contained in the blade bearing (50) that is used to install described blade (20) within the described shell (10), described blade bearing (50) has a upper notch (51), a lower convexity (52), a blade mount pad (53), go up a fulcrum (55) and a lower fulcrum (56) for one, described blade mount pad (53) has a rear end and a front end, described rear end is fixed on the described blade bearing (50) by a riveting set (531), described front end has a side shoot (532) and a blade is installed projection (533), and described upper notch (51) has a vertical plane (511);

Blade bearing pulling spring (54), its front end (541) be fixed on the described blade bearing (50) and rear end (542) be fixed on the described shell (10), and described rear end (542) will be higher than described front end (541); And,

A blade exchange device (60), it is contained in the groove of offering on the described shell (10), and can move back and forth in described groove, described blade exchange device (60) has a top (61) and a slope (111) that is formed on the described shell (10).

2. cutter as claimed in claim 1 is characterized in that described shell (10) is made of one first upper casing (11), second upper casing (12) and a lower casing (13).

3. cutter as claimed in claim 1 is characterized in that described slide plate (40) at least one ribs (44), and corresponding rib (44) offers at least one chute on the inner surface of described shell (10).

4. cutter as claimed in claim 1 is characterized in that described blade exchange device (60) has a button (62).

5. cutter as claimed in claim 1 is characterized in that being formed with a sideslip bar (31) on the inner surface of described push button (30), and described sideslip bar (31) is fastened in the seam (121) that described shell (10) upper edge axis C offers.

6. cutter as claimed in claim 5 is characterized in that can also being provided with a secondary side draw runner (32) on described push button (30) inner surface, and secondary side draw runner (32) is fastened in the corresponding seam that described shell (10) upper edge axis C offers.

7. cutter as claimed in claim 6, it is characterized in that described top (62) facing to facing toward second snap ramp (311) that is respectively equipped with one first snap ramp (621) and a correspondence on the direction of described blade exchange device (60) on the direction of described push button (30) and at described sideslip bar (31), described second snap ramp (311) is towards the inner surface of described push button (30).

8. as claim 2,3,4,5 or 6 described cutters, it is characterized in that on the described surface of being close to described blade (20) at blade bearing (50) a powerful magnet block (70) being installed.

9. as claim 2,3,4,5,6 or 7 described cutters, it is characterized in that on described second upper casing (12), being provided with a spacing bumping post (122).

10. as claim 2,3,4,5,6 or 7 described cutters, it is characterized in that on described second upper casing (12), being provided with a spacing bumping post (122), the rear end (58) of described blade bearing (50) is the inclined-plane, and it is inclined surface (123) that described spacing bumping post (122) is gone up the face that contacts with rear end (58).

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