EP0963819A1 - Knife with at least one guard - Google Patents

Abstract

The knife (10) has two rigid protective pins (17) along a cutter (13) with a blade (12), held so that they can be moved parallel to their longitudinal axis (L) in a sliding guide cavity (19) of a handle (11) against a spring force (F). The pins form a safety arc device (16). The two pin regions extend parallel and spaced out from each other either side of the cutter. The free ends of the pin regions form guide ends (22) bent up above the knife blade tip (15).

Description

The invention relates to a knife with at least a protective part according to the preamble of Claim 1. Such a knife is in the DE 31 16 354 A1 described.

The knife known from DE 31 16 354 A1 has become particularly extensive as a cardboard cutting knife proven in practice. The well-known knife is felt however in need of improvement because the protection pin also accidentally in its release position is displaceable and thus e.g. Hand injuries can be caused. For example then happen when a worker put the knife in the pocket of the work suit for example, one that can be opened with both hands Handle cardboard. Reaching in afterwards in your pocket it is then quite possible that the protective pin when gripping the knife from his Guard position moved away so that the hand accidentally a cutting contact with the partially exposed Knife edge suffered.

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 by means of a locking direction spring-loaded locking rocker (see US 142 942 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 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, Fig. 2 dotted Contour). For the retraction of the spring pin in the The spring pin has a knife-cutting position separate handle on (see US 142 942 Fig. 3 Pos. r).

According to a knife of another type DE 34 33 286 A1 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 from self-springing workshop with 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 DE 31 16 354 A1, 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 solved in that the protective part an actuation locking device is assigned, which means an operating button in the protective position of the Protective part can be locked and unlocked and that the protective part is in its protective position is locked when the control button is not pressed.

After a first basic invention Embodiment causes depression, for example 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. operated becomes.

According to a further invention Embodiment also moves the protective part 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.

The usable according to the invention Protective part can be the pen shape already described or a bow shape or a shield-like training have, the latter in a known manner for example against spring return force from their Protective position can be placed in a release position can.

The protective part can be used in a known manner as a double swivel plate be trained which during a protective gap for its protective position the knife blade forms. When the one-sided peripherally mounted double swivel plate swivels this against spring return force relative to Handle body upwards, so that the knife edge for Carrying out the cutting work from the protective gap can come out.

The protective part, which is either translational or is rotatable, 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.

Another preferred embodiment of the Knife according to the invention is that Protective part with at least one rigid protective pin each forms a rigid pin area, which forms extends along the edge of a knife blade and which is parallel to its longitudinal central axis in one Tranglator sliding guide space of the handle body Slidably held and against the spring return force can be inserted into the handle body, that the actuation locking device one with the Handle body fixed, approximately transverse to the longitudinal central axis of the pin area extending bolt stop surface has that within the handle body on Pin area is held a latch, which the Bolt stop surface engages with a bolt surface and the pen area in its protective position blocked, and that the locking surface by means of the control button to its unlocked position is relocatable.

In the above-described embodiment of the invention is required when the control button is pressed only one pressure contact of the protective part with the material to be cut to bring the protective part into its release position to move. When the Cutting work, i.e. when the pressurization has ended the pen area, the latter returns to its protective position back, in which it automatically locks as long as the control button is not pressed becomes. Only when the control button is pressed the pin area can move out of its protective position his release position will be postponed.

According to a variant according to the invention the latch forms a pivotable on the pin area stored pawl.

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); automatically locks in place 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 cooperates.

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 42 the pawl K the bolt stop surface 43 of the Stop blocks 29 engages behind locking. Here 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 Resetting force of the screw pressure 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 (15)

Knife (10) with at least one protective part (17), which extends along a cutting edge (13) of an especially replaceable knife blade (12) forming a knife tip (15) at its free end, the protective part (17) on a handle body (11) is movable and can be moved from its protective position overlying the cutting edge (13) against the spring restoring force (F) into its release position exposing the cutting edge (13), characterized in that an actuating locking device (H) is assigned to the protective part (17) can be both locked and unlocked by means of an operating key (27) in the protective position of the protective part (17), and that the protective part (17) is locked in its protective position when the operating key (27) is not actuated. Knife according to claim, characterized in that the protective part forms at least one rigid protective pin, each with a rigid pin area (17) which extends along the cutting edge (13) of a knife blade (12) and which is parallel to its longitudinal central axis (L) in a sliding guide space (19) of the handle body (11) is held in a translationally slidable manner and can be pushed into the handle body (11) against the spring restoring force (F) such that the actuation locking device (H) has a handle body (11) which is fixed and approximately transverse to the longitudinal central axis (L) of the pin region (17) extending bolt stop surface (43) that a bolt (K) is held within the handle body (11) on the pin region (17), which engages behind the bolt stop surface (43) with a bolt surface (42) and thereby the pin region ( 17) blocked in its protective position, and that the locking surface (42) can be moved into its unlocked position by means of the control button (27) is. Knife according to claim 2, characterized in that the bolt is a pawl (K) pivotably mounted on the pin region (17), the locking surface of which forms the bolt surface (42). Knife according to claim 3, characterized in that and the translation direction (x, y) of the pin region (17) lies in the pivoting plane of the pawl (K) or is parallel to it. Knife according to claim 3 or according to claim 4, characterized in that the pawl (K) is a pull pawl. Knife according to one of claims 3 to 5, characterized in that a control body (C) is motion-coupled to the control button (27), which has a control surface (40) with which the pawl (K) can be pressurized in the unlocking direction. Knife according to claim 6, characterized in that the control surface (40) is part of a control recess (39) into which the pawl (K) dips with its head (33) towards the knife tip (15) in the immersion direction (at ET) while the pin area (17) is in its protective position, the immersion depth (ET) of the latch head (33) and the depth (AT) of the control recess (39) which is the same as the immersion depth (ET). Knife according to one of claims 3 to 7, characterized in that the pawl (K) is loaded in the locking direction (v), in particular is spring-loaded. Knife according to one of claims 6 to 8, characterized in that the control body (C) is spring-loaded when the pawl (K) is unlocked. Knife according to one of claims 6 to 9, characterized in that the control button (27) and the control body (C) are integrally formed. Knife according to one of claims 7 to 10, characterized in that the area (46) of the control body (C) forming the control recess (39) counter to the restoring force of a control spring (45) in the immersion direction (at ET) of the latch head (33) relative to the Control body (C) is resiliently limited, and that the resiliently mounted area (46) adjacent to the control recess (39) forms a control projection against which the head (33) of the pawl (K) on its way from the release position to the protective position of the pin area (17) starts when the pin area (17) is relieved of an external pressure (P) and the operating button (27) is pressed continuously, the restoring force of the control spring (45) being less than the spring restoring force acting on the pin area (17) (F) which the pawl (K) opens its pivoting path towards the bolt stop surface (43) by displacing the flexible region (46). Knife according to claim 11, characterized in that the resiliently mounted area forms a one-armed lever (46). Knife according to claim 12, characterized in that the pivot bearing (47) of the one-armed lever (46) is adjacent to an operating handle (38) of the operating button (27), that the control recess (39) on one long side at the free end of the one-armed lever (46 ) facing the jack head (33) is arranged, while the control projection (48) located on the same long side is arranged between the control recess (39) and the rotary bearing (47). Knife according to claim 13, characterized in that the control spring (45) which forms a compression spring and which is supported between the latter and the control body (C) is arranged on the long side of the one-armed lever (46) facing away from the control recess (39). Knife according to one of claims 2 to 14, characterized in that the bolt stop surface (43) fixed to the handle body (11) is formed by a stop block (29) which at the same time represents an axial guide (19) for at least one pin region (17).

Images