EP0963819B1 - Knife with at least one guard - Google Patents

Description

The invention relates to a knife with a protective part according to the Preamble of claim 1. Such a knife is in US 40 91 537 A. described.

In the knife according to US 40 91 537 A one with his Longitudinal central axis extending parallel to the cutting edge of the knife blade Protective pin, which is spring-loaded to the outside in its protective position, three axial areas. The front longer axial area of the protective pin points an average diameter, the axial area adjoining it at the back, the locking area, a small diameter and the itself the rear axial area adjoining the locking area is the largest Diameter on.

One guided transversely to the longitudinal central axis of the protective pin Bolt has a bolt opening with a diameter such that the latter alternatively the middle of the protective pin at its front axial area Diameter and at its latch area small diameter, not however, encompass at its rear axial area of larger diameter can. The approximately plate-shaped latch is spring-loaded towards the outside of the protective pin.

The area of the plate-shaped bolt that projects freely towards the outside represents an operating button. If the bolt opening with the locking area of the protective pin is aligned and the latch is not actuated the protective pin is locked in its advanced protective position. there lies the rear larger axial area of the protective pin with the larger Diameter on the edge surface surrounding the bolt opening.

If the control button of the knife according to US 40 91 537 A When the latch is actuated and the cutting work is started, the outer one bumps End face of the protective pin against the material to be cut, so that the protective pin move against the restoring force of a helical compression spring into the handle body can. If the control button is not during cutting depressed and then the cutting work is finished, the transferred Helical compression spring automatically locks the protective pin forward into its locked position Protective position.

By the interaction of the front axial protection pin area medium diameter with the spring-loaded bolt of the Knife according to US 40 91 537 A, it can when pushing the Guard pin, however, to a frictional delay or even a jamming clamp.

A protective pin arrangement similar to the knife of US 40 91 537 A is described in DE 81 19 855 U1, with the difference, however, that the Longitudinal actuation locking device constructed in the manner of a slide the knife is to be adjusted step by step. The well-known knife is felt to be in need of improvement insofar as if the carriage happens to be in its rearmost stop position, the protective pin accidentally is to be moved to its release position. This can be the case, for example happen when a worker puts the knife in the pocket of the work suit sticks to lift a box to be opened with both hands. When you then reach into your pocket, it is entirely possible that the protective pin is removed from its protective position when the knife is gripped moved inward into the handle body so that the hand accidentally suffers a cutting contact with the partially exposed knife edge.

From US 142 942 is a non-generic knife for edge processing of boot or shoe soles known, in which a along the knife blade back arranged axially by means of a compression spring towards the outside of the knife tip resettable Spring pin with its hook-shaped curved free End the tip of the one in cutting position Knife blade grips tightly. In this cutting position is the spring pin in the locking direction spring-loaded locking rocker (see US 142 942 A Fig. 2 Pos. D, E, n) secured. In the cutting position serves the spring pin with its hook-shaped End as a cutting jig used for edge trimming an inadvertent injury to the sole of a shoe to prevent adjacent upper leather. The knife edge is in itself with the knife according to the US 142 942 A in no position of the spring pin protected.

In the event that the knife blade is replaced or to be ground, the locking rocker solved so that the spring pin with its hook-shaped Area offset in front of the knife tip (see US 142 942 A, Fig. 2 dotted Contour). For the retraction of the spring pin in the The spring pin has a knife-cutting position separate handle (see US 142 942 A Fig. 3 Pos. r).

According to a knife of another type DE 34 33 286 Al discloses a cross-section U-shaped protective part relative to a knife blade to move longitudinally and this Relocation movement with an actuation button bring about. The one described with the above known knife according to DE 31 16 354 A1 connecting Advantage that the protective pin is alone by pressure contact with the material to be cut into its release position can be moved is with the knife not given according to DE 34 33 286 A1.

Finally, from DE 35 40 026 A1 is a knife with a pivotable around a pivot Protective part made of self-resilient material a spring tongue approach known. Securing the Protective position of the known pivotable protective part happens to you in a rather cumbersome way to be handled separately swiveling safety bracket. Starting from the known one described above Knife according to US 4 091 537 A, is the Invention based on the object, the protective function to improve the protective part of the known knife.

According to the invention, this object is achieved by a knife according to claim 1.

According to the invention causes depression the operating button unlocks the Protective part in its advanced protective position, so that the protective part in when the button is depressed its release position exposing the knife edge can be pushed back. As soon as the control button no longer applied, i.e. no longer depressed and the protective part with the spring return force in its advanced protective position the actuation lock is activated, which only allows the protective part to be pushed back, when the control button is depressed, i.e. actuated becomes.

According to the invention the protective part also moves in depressed control button and at Interrupt the cutting work or at the end the cutting work in its advanced protective position back, but remains in spite of it depressed control button in its by the Actuation locking device effected locking position. The protective part can be removed from this locking position only with repeated conscious actuation, i.e. by Release the control button and press it again the control button, from its locked position be freed.

That translationally movable protective part can also with be provided with a movement limitation so that a predetermined depth of cut is thereby achievable. This movement limitation can either be gradual or continuously (continuously, for example by means of a set screw) can be changed.

According to the invention, the direction of translation is of the pin area in the swivel plane of the Jack or parallel to this.

An inventive has been found to be expedient Embodiment proven, in which the jack a Pawl is.

An advantageous embodiment according to the invention is characterized in that with the control button a control body is motion-coupled, which has a control surface with which the Jack can be pressurized in the unlocking direction.

Further features of an embodiment according to the invention consist of part of the control surface a tax recess. In this tax recess the pawl can head towards the tip of the knife penetrate in the immersion direction while the Pin area is in its protective position. In order to the pawl in this position its locking function can perform, i.e. with its bolt surface can reach behind the bolt stop surface are Immersion depth of the pawl and that of the immersion depth rectified depth of the tax recess each other Voted.

In a particularly advantageous embodiment the invention also becomes a lock the pen area in its protective position, if the control button after the Cutting work and the associated pressure relief inadvertently operated the pen area becomes.

Such an advantageous embodiment is characterized according to the invention, that the area of the tax recess forming the Control body against the restoring force of a control spring relative to the plunge head is limitedly resilient to the control body, and that the resiliently mounted area is adjacent the tax recess forms a tax advantage, against which the head of the jack on its way from the Release position for protecting the pen area tarnishes when the pen area from an outer The pressure is released and the control button is held is operated, the restoring force of the control spring is less than that acting on the pen area Spring return force, which the pawl by displacing the resilient area swings in opens towards the bolt stop surface.

Other features of the invention are additional See subclaims.

Fig. 1 ein als Sacköffnungsmesser ausgebildetes Messer vor Aufnahme der Schneidarbeit,

Fig. 2 eine Seitenansicht entsprechend dem mit II bezeichneten Ansichtspfeil in Fig. 1,

Fig. 3 eine Stirnansicht entsprechen dem mit III bezeichneten Ansichtspfeil in Fig. 1,

Fig. 1A das Messer gemäß Fig. 1 bei Aufnahme der Schneidarbeit,

Fig. 4-6 unterschiedliche Funktionsdarstellungen einer anderen Ausführungsform mit geöffnetem Griffkörper-Innenraum und

Fig. 7 -10 etwa in Anlehnung an die Darstellungsweise gemäß den Fig. 4-6 unterschiedliche Funktionsdarstellungen einer weiteren Ausführungsform.

Exemplary embodiments according to the invention are shown in the drawings. It shows

1 shows a knife designed as a bag opening knife before starting the cutting work,

2 is a side view corresponding to the view arrow marked II in Fig. 1,

3 shows an end view corresponding to the view arrow labeled III in FIG. 1,

1A the knife of FIG. 1 when the cutting work is started,

Fig. 4-6 different functional representations of another embodiment with the handle body interior open and

FIGS. 7-10, roughly based on the representation according to FIGS. 4-6, different functional representations of a further embodiment.

The different embodiments shown and their individual parts are built despite Deviations always with the same reference numbers designated.

Each knife 10 has a handle body 11 and a knife blade 12 releasably fastened therein, the in the embodiments shown as a trapezoidal blade is trained and therefore a straightforward Cutting edge 13, one inclined to the handle longitudinal axis y extending straight end face 14 and in front a knife blade tip 15 has.

A safety bar 16 has two in parallel spacing pin regions 17 arranged relative to one another, whose approximately piston-like inner ends 18 in a guide channel 19 in the push-out direction x and z translationally movable in the insertion direction are.

An insertion of the pin areas 17 in the direction z is only possible against a spring restoring force, the generally with a force vector F and the rest in Fig. 1 by a dashed helical compression spring 20 is marked.

At the front of the pin areas 17 are each with an approximately part-circular arc 21 two leading ends 22 connected and at a distance in front of the knife blade tip 15 and the end face 14 of the knife blade 12 pulled around. The free ends 23 of the leading ends 22 are connected to one another via a strap web 24 connected.

In particular from an overview of FIGS. 1-3 and Fig. 1A it is clear that the respective Safety bar 16 on both sides next to the cutting edge 13 and a protective space S in front of the knife blade tip 15 for receiving the cutting edge 13 when the Safety bar 16 in its advanced Protective position according to FIGS. 1-3, 4 and 5, 7 and 8 and Fig. 10 is located.

1-3 and 1A follows the two leading ends 22 each have a rearward direction Temple end 25 on, both temple ends 25 in turn connected to one another by a strap web 24 are. Temple ends 25 and temple bridge 24 are in one Guide channel 26 of the handle body 11 along the Shift directions x and z translationally displaceable added.

The function of all versions of the knife 10 happens in such a way that the knife 10 with the respective leading end 22 of the safety bracket 16 is placed on the bag surface E, whereby at the same time the sack material between the two leaders 22 is streamlined and leveled, in particular 2 and 3 is conceivable.

Then the handle body 11 in the printing direction P pushed down, the safety bar 16 along the direction of insertion z into the handle body 11 drives in and the knife blade 12 the bag surface E penetrates. Then the cutting work start by the knife 10 in the cutting direction A moved and the sack is cut open.

All the embodiments shown have one Actuation locking device, which by means of a Control button 27 is actuated. The knife 10 can alternatively with two different actuation locks be equipped.

The first variant is that the depressing the control button 27 unlocking of the safety bar 16 in its advanced Location (Fig. 1, Fig. 5) causes the safety bar 16 with the key 27 pressed in the direction of z can be pushed back.

As soon as the key 27 is not pressed and at the same time the safety bar 16 in its advanced Protection position has returned (Fig. 1, Fig. 5), a lock is automatically inserted Push back the safety bar 16 in the direction of only permitted if the control button 27 is pressed becomes.

An alternative design variant exists 7-10 in that even at uninterrupted or button 27 and (which must be added) if the cutting work is interrupted or when the safety bar is finished cutting 16 in its advanced protective position returns, but then despite the button (Fig. 10) remains in its locking position. From this The locking bracket 16 can only after repeated conscious actuation, i.e. Let go key 27 and pressing key 27 again, be released from its locking position.

According to the embodiments of FIGS. 5-10 the safety bar 16 ends below its two Pin areas 17 with the part-circular arches 21, the leading ends 22, the free ends 23 and finally the strap bridge 24.

The guide channels 19 for the two pin areas 17 share a guide channel block 28 and on a stop block 29.

On the upper ends of the pin areas 17 a storage bracket 30 is firmly attached, which itself that is, in the push-out direction x and in the push-in direction z of the two pen areas uniformly this moves. The stop block 29 acts at the same time as a pull-out limitation for the bearing bracket 30 load-bearing pin areas 17.

The bearing bracket 30 is supported at its free end in a storage solution 31 a pawl K, which according to Kind of a two-armed lever is formed and a latch arm 32 with a jack head 33 and also has a reset arm 34, which by means of a compression spring held in the bearing bracket 30 35 in the direction of incidence or locking v Jack K is reset loaded.

The pin areas 17 are for the purpose of simplification the drawing shown interrupted, as well a tension spring 36, the lower end of which is fixed in the handle body Hook 37 and its upper end in one held on the bearing bracket 30 fixed hooks 37A is. The tension spring 36 accordingly represents the spring restoring force F represents which regarding the pin areas 17 acts in the direction of ejection x.

With the control button 27, which is an operating handle 38, a control body C is in one piece educated.

The control body C forms a control recess 39 with a control surface 40, which with a counter control surface 41 on the jack head 33 of the pawl K interacts.

The jack head 33 also forms a locking surface 42, which is intended with the bolt stop surface 43 of the stop block 29 cooperate.

The function of the knife according to Fig. 4-6 is the following:

4 is the safety bar 16 in its advanced locked protective position. It locks the one marked overall with H. Actuation locking device the safety bar 16 with its pin areas 17 in the protective position. This is because the locking surface 42nd the pawl K the bolt stop surface 43 of the Stop blocks 29 engages behind locking. there the helical compression spring 35 presses the pawl K in their locking position.

As soon as the control button 27 against the restoring force the helical compression spring 44 with a pressure D applied and the control body C depressed is unlocked between the Bolt surface 42 and the bolt stop surface 43 (Fig. 5).

Once unlocked, the Handle body 11 according to the pressure direction P. be bumped down while the safety bar 16 on the material to be cut, namely on the surface of the sack E, supports, so that the knife blade 15 in the Sack surface E penetrate and the cutting process in Cutting direction A can begin.

From Fig. 6 it can be seen that the pawl K together with the two pin areas 17 relative has moved up to the handle body 11.

As soon as a work break occurs and so that the pressure P is also eliminated, e.g. at pressed control key 27 in reverse analog Way a return movement according to the state Fig. 5 in the state of FIG. 4, in which the Cutting position of the safety bracket 16 locked is.

As is clear from the comparison of FIGS. 5 and 4, the jack head 33 is immersed with an immersion depth ET into the control recess 39. Because the immersion depth ET is less than the depth AT of the tax recess 39, it is ensured that the transition 5 in the locked state 4 a barrier-free locking between the latch-side locking surface 42 and the bolt stop surface 43 fixed to the handle housing can.

Based on the functional description above it is also conceivable that it is only an initial one Actuation pressure D and a simultaneous Applying pressure P requires the safety bar 16 from its protective position (Fig. 4) in its Cut 13 exposed position (Fig. 6) convict. An unlocking of the actuation locking device H takes place in the protective position of the Safety bracket 16 whenever the operating handle 38 depressed according to the pressure D. becomes.

The embodiment corresponding to FIGS. 7-10 differs from the embodiment accordingly 4-6 in that the tax recess 39 in the push-out direction x against the restoring force a control spring 45 is flexible. That is, as part of the control body C a one-armed lever 46 is provided, the pivot bearing 47 of the operating handle 38 is adjacent.

Between the control recess 39 and the pivot bearing 47, the one-armed lever 46 forms one to the jack head 33 control projection 48.

The operation of the embodiment accordingly 7-10 is the following:

7, the safety bar 16 is by means of the actuation locking device H in its The protective position locks and supports itself the bag surface E. The latch surface 42 of the pawl K is locked on the bolt stop surface 43 of the stop block 29. As soon as the Operating handle 38 in the printing direction D against Restoring force of the helical compression spring 44 is applied presses the control surface 40 of the control recess 39 of the one-armed lever 46 against the Counter control surface 41 of the pawl K and offset this in their unlocked position according to FIG. 8 the control spring 45 ensures a safe immersion of the jack head 33 into the control recess 39.

8 after unlocking the Protection position of the safety bracket 16 has occurred, analogous to FIGS. 5 and 6, a pressure P on the Handle body 11 exercised and thus the cutting function (see FIG. 6) can be brought about.

When comparing FIGS. 9 and 7, it is conceivable that the pin areas 17 together with the pawl Can move K down in the direction x when the operating handle 38 is no longer actuated is what in an analogous reverse manner without further notice the initial state according to FIG. 7 is reached. A ratchet-side sloping surface 49 slides in Direction x over a ramp surface 50 of the handle body fixed Stop blocks 29 so that the jack head 33rd under the action of the helical compression spring 35 in its Rest position can be moved.

The last function described also applies to unactuated control button for the previously described embodiment at the transition of 6 into the position according to FIG. 4.

In the event, however, that the pressure P at the end the cutting work is omitted, but at the same time the Operating handle 38 with the pressure D. 10, the state according to FIG. 10 arises, after which the jack head 33 on its way in the direction x has previously run against the control projection 48. Since the spring restoring force F of the tension spring 36 is larger is as the restoring force of the control spring 45, pulls the tension spring 36 the pawl head 33 against the control projection 48 of the one-armed lever 46, so that the latter displaced downwards in the x direction and the jack head 33 unhindered by the spring 35 in his locked position according to FIG. 10 is pressed. As soon as the operating handle is relieved and the Spring 44 pushes the control body C out, dips the jack head 33 again in the control recess 39 a (Fig. 7).

Claims (13)

1. Knife (10) with a safety guard (16), forming at least one rigid guard pin (17) which extends along the cutting edge (13) of a knife blade (12) and which is retained so as to be slidably displaceable parallel with its longitudinal mid-axis (L) in a slide guide compartment (19) of a handle body (11) and is able to slide from its safety position projecting beyond the cutting edge against the force of a spring return force (F) into a position in the handle body (11) in which the cutting edge (13) is exposed, the safety guard (16) co-operating with a lock operating mechanism (H) which can be both locked and released by means of an operating trigger (27) when the safety guard (16) is in the safety position, the safety guard (16) being locked in its safety position when the operating trigger (27) is not being operated, whereby the guard pin (17) is automatically returned from its release position to its safety position by the spring return force (F) and whereby the lock operating mechanism (H) has a lock stop surface (43) permanently joined to the handle body (11) and extending substantially transversely to the longitudinal mid-axis (L) of the pin region (17), characterised in that a lock is mounted on the guard pin (17) inside the handle body (11) which engages behind the lock stop surface (43) by means of a lock surface (42), thereby locking the guard pin (17) in its safety position, and in that the lock surface (42) can be displaced into the release position by means of the operating trigger (27), the lock being a catch (K) pivotably mounted on the guard pin (17), the control surface of which forms the lock surface (42).
2. Knife as claimed in claim 1, characterised in that the direction of translation (x, y) of the pin region (17) lies in the pivot plane of the catch (K) or is parallel therewith.
3. Knife as claimed in claim 1 or claim 2, characterised in that the catch (K) is a tension-operated catch.
4. Knife as claimed in one of claims 1 to 3, characterised in that the operating trigger (27) is displacingly coupled with a control body (C), which has a control surface (40), by means of which pressure can be applied to the catch (K) in the release direction.
5. Knife as claimed in claim 4, characterised in that the control surface (40) is part of a control recess (39) in which the catch (K) is downwardly inserted by its head (33) towards the knife tip (15), whilst the pin region (17) is located in its safety position, the insertion depth (ET) of the catch head (33) and the depth (AT) of the control recess (39) aligned with the insertion depth (ET) being designed to match one another.
6. Knife as claimed in one of claims 1 to 5, characterised in that the catch (K) is loaded in the locking direction (v), in particular is spring-biassed.
7. Knife as claimed in one of claims 4 to 6, characterised in that the control body (C) is return-spring-biassed on release of the catch (K).
8. Knife as claimed in one of claims 4 to 7, characterised in that the operating trigger (27) and the control body (C) are of an integral design.
9. Knife as claimed in one of claims 7 to 8, characterised in that the region (46) of the control body (C) forming the control recess (39) is mounted so as to be flexible to a restricted degree relative to the control body (C) in the downward direction in which the catch head (33) is inserted against the return force of a control spring (45), and in that the flexibly mounted region (46) forms a control projection adjacent to the control recess (39), against which the head (33) of the catch (K) runs on its travel from the release position to the safety position of the pin region (17) if external pressure on the pin region (17) is relaxed and the operating trigger (27) is continuously operated by an external pressure (P), the return force of the control spring (45) being lower than the spring return force (F) acting on the pin region (17), which opens the pivot path of the catch (K) to the lock stop surface (43) by displacing the flexible region (46).
10. Knife as claimed in claim 9, characterised in that the flexibly mounted region forms a single-arm lever (46).
11. Knife as claimed in claim 10, characterised in that the pivot bearing (47) of the single-arm lever (46) is adjacent to a control handle (38) of the operating trigger (27) and the control recess (39) is disposed on a longitudinal face on the free end of the single-arm lever (46) facing the catch head (33), whilst the control projection (48) located on the same longitudinal face is arranged between the control recess (39) and the pivot bearing (47).
12. Knife as claimed in claim 11, characterised in that the control spring (45) forming a compression spring on the longitudinal face of the single-arm lever (46) remote from the control recess (39) is arranged between the former and the control body (C).
13. Knife as claimed in one of claims 1 to 12, characterised in that the lock stop surface (43) attached to the handle body (11) is formed by a stop block (29) which simultaneously constitutes an axial guide (19) for at least one pin region (17).

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