EP0890815B1 - Portable firearm with a blind cartridge device - Google Patents

Abstract

The gun has a muzzle-damper at the forward end of the barrel (1) and with a bore (15) coaxial to the latter's bore and of larger diameter. A widening bore (17) extends from the end of the cylindrical one (15) to the other end of the damper, and has gas outlet ports (19) in its walls. The practice insert (25) slides onto the damper and is fixed to it or the barrel. A block contains a blind hole (39) of smaller diameter than that of the barrel bore, and has a rearwards extension (35) fitting in the bore. A compression spring between the damper and the practice device is compressed when the device is fixed in position, and when freed thrusts the device forwards, so that the combustion gases escape from the barrel past the block and through the outlet ports in the damper.

Description

The invention relates to a handgun according to the Preamble of claim 1.

Location names used in these documents such as "Front", "landscape" or the like are defined as follows: "front" always points in the weft direction, "longitudinal" always runs parallel to the soul axis, "above" goes from the normal horizontal Gun out.

Such a handgun with a muzzle flash damper and Maneuver cartridge device is known (US Pat. No. 3,744,370) and has has proven itself in the meantime; the maneuver cartridge device the invention in its details, the gas jam and tackling projectiles and particles be constructed like this well-known maneuver cartridge device. Furthermore the following publications are known to the applicant: U.S. Patent 3,766,822, U.S. Patent 3,732,776 and CH Patent 381,569.

The well-known handgun, preferably a rapid-fire rifle, has an external thread at the front end of the barrel on which a muzzle flash damper is attached.

This known muzzle flash damper consists of a Rifle with an internal thread at the rear end which is the muzzle flash damper on the external thread of the Rapid fire rifle can be screwed tight.

A cylindrical bore section adjoins the internal thread whose diameter is only slightly larger than the largest diameter of the barrel bore; the purpose of this cylindrical section is the mouth of the barrel to protect from damage caused by improper cleaning can occur. On the cylindrical Section includes nozzle-like to the front end of the muzzle fire damper Section of the bore. The side wall of the nozzle section is penetrated by radial openings, which are usually called Longitudinal slots are formed. The front peripheral edge of the nozzle section faces two in the transverse direction opposite notches on which to attach a wrench-like tool to serve the Muzzle fire damper to screw on the barrel or from Unscrew barrel. The muzzle flash damper can also open flats on the outside to attach a Have wrench.

A similar maneuver cartridge device essentially has one cylindrical block with a central blind hole in which a can is inserted, the back is open and the inside diameter is significantly smaller than that of the run. On the front part of the outer circumference the block has at least one spiral groove. This stands through at least one cross hole with the blind hole in Connection. The block is welded into a sleeve, see above that the spiral groove is covered from the outside.

Is in the handgun with attached maneuver cartridge device a maneuver cartridge is fired, then the resulting powder gases are forced through a can into the Blind hole and then through the covered, narrow spiral groove to pour. This increases the pressure completely during the run considerably, so that to load the handgun required gas pressure or recoil pulse is built up.

Any foreign objects that come off when the cartridge is fired released, such as fragments of a wooden floor or particles of a bursting plastic cartridge, and that get into the spiral groove become one there causes vortex-like movement so that after leaving crushed the spiral groove with a high centrifugal component to be carried outside and from the front protruding sleeve are caught. Accidental a sharp cartridge loaded into the handgun, then it is braked in the can and possibly from the bottom of the Blind bore caught. The powder gases are relieved through the spiral groove. The run keeps it short. resulting overpressure was undamaged, as was the Bracket on the mouth. Just that The maneuver cartridge device is then so damaged that it needs to be replaced.

In this maneuver cartridge device, which instead of the muzzle fire damper must be attached, result however unexpected problems: so that the Muzzle flash damper does not loosen despite the shooting its internal thread on the external thread of the barrel is strong tightened; around the muzzle flash damper before use unscrew the maneuvering cartridge device and then again to be screwed on to the armory of the troop, which the Hand gun has introduced tools of the above Kind spent. It has now been found that the Gun maintenance do not pass these tools on to yourself In the event of a loss the trouble associated with this Save administrative work. At most, every new one Rifle before its first release the muzzle flash damper loosened and only slightly tightened by hand.

Helped in case of a stuck muzzle fire damper then the troop with the bayonet or any Makeshift tools through the radial slots in the Side wall of the muzzle fire damper can be plugged in loosen the muzzle flash damper so that the muzzle flash damper Risk of being damaged. Lots screwed-on muzzle flash dampers influence completely significantly the shot precision and can as well get lost.

This problem can be solved by an appropriate official regulation be fixed, such as a supervisor committed to the arms roll call before and after deployment to carry tools of the type mentioned from maneuver cartridge devices and to ensure that they are used correctly.

These problems are known from the above-mentioned Maneuver cartridge device (US Pat. No. 3,744,370), however, only partially solved by moving the cartridge over the Muzzle flash damper can be pushed on and on or on Barrel is attachable. When attaching the The maneuver cartridge device therefore remains Muzzle flash damper in its position; he must be from the troop never removed during normal use of weapons become. The maneuvering cartridge device, on the other hand, is required attached and then removed again.

There are advantages: the muzzle flash damper protects sustained the barrel muzzle because it was never unscrewed from it becomes. The muzzle flash damper can also be warm be screwed on or shrunk on so that it can be used with simple means is not solvable. It’s even possible weld the muzzle flash damper or in one piece to manufacture with the barrel. For the muzzle flash damper and its attachment can thus be the cheapest procedure be elected since he is not, as has been the case up to now, by the troops must be unscrewable.

Basically, it is possible and possibly also advantageous, the maneuvering device from a single To manufacture piece that with a back open Hole can be pushed over the muzzle fire damper.

However, it is preferred that the block in the front Area of a sleeve is attached, the rear area can be slid over the muzzle fire damper.

So the sleeve can not only have a spiral groove in the seal the cylindrical outer surface of the block, see above that a helical gas outlet channel is created, but the sleeve can be as simple, with a through hole equipped workpiece are manufactured, whose rear section matches the outside diameter of the Muzzle fire damper is formed. This points preferably a largely cylindrical outer contour.

The block can be welded into the sleeve, for example are, but is preferably by means of a pressed Cross pin attached in the sleeve. So must be in the manufacture no heat distortion can be expected, which at Mating surfaces of the maneuvering cartridge device according to the invention Could cause difficulties.

It would basically be conceivable to like the maneuver parachute device a can from the front onto the muzzle flash to postpone. But there is a high gas pressure from the inside of the barrel acts on the maneuvering cartridge device, it is preferred that the block backward by an end fitting is extended, which is penetrated by the blind bore and when the maneuver cartridge device is attached, it fits into the coaxial, cylindrical bore of the muzzle fire damper intervenes.

The target area for gas pressure is therefore only a little larger than the cross-sectional area of the barrel, so that the necessary to hold the device on the mouth Force is minimized. This is particularly important if by mistake a sharp cartridge is attached Gun cartridge device is shot down because in addition to of the projectile energy acting on the device particularly high gas pressure occurs.

A preferred further training also takes this accident into account, after which with the maneuver cartridge device attached Transition between the end section and the narrowed Blind hole within the widening hole of the Muzzle flash damper. If a projectile in the narrow blind hole occurs, then this and with it the end spout widened; who used up here Deformation work reduces the impulse when the Projectile to the bottom of the blind hole. The expansion of the However, the end connector is only made at such a point, that the muzzle flash damper is not due to the expansion Is affected. After removing the damaged one The weapon itself remains with the maneuver cartridge device Muzzle flash damper undamaged.

The maneuvering cartridge device according to the invention can, for example like the well-known through a threaded connection on Muzzle flash absorbers are attached. It can also if the barrel is sufficiently thick, even that Grasp the muzzle flash damper and into a thread on the Intervene barrel. As a rule, it is immediately noticeable if the maneuver cartridge device is not far enough is swept up. But it is, as further below, closer is explained, also possible and even advantageous, that Maneuver cartridge device using a different type of holder to attach, which is about a projection of the Muzzle fire damper reaches behind, so that Maneuver cartridge device with a single one Handle can be mounted.

To ensure the reliable fit of the muzzle fire damper check, it is proposed according to claim 1 that the outside of the end connector in the longitudinal direction movable stop ring is arranged by a compression spring supported against the block against one Stop is pressed and an outer diameter so dimensioned has that he in the course of putting on the Maneuver cartridge device on the muzzle fire damper against the wall of the widening bore runs into and at further pressing the compression spring together.

The maneuver cartridge device must therefore be placed under Overcoming the force of the compression spring on the muzzle flash damper be pressed until the bracket engages and holds the maneuver cartridge device; is not that If so, the compression spring pushes the maneuvering cartridge device back to the front, where its location clearly indicates that no attachment has taken place.

This compression spring device also has the advantage despite great tolerances, the perfect fit of the maneuvering cartridge device to ensure and to on the muzzle prevent it from rattling, wobbling, and itself consequently more and more deflects and loosens.

It is also advantageous that the sleeve has passages, which are arranged so that when the compression spring is relaxed, i.e. with the maneuver cartridge device attached but not attached, the powder gases through the Muzzle fire damper and the passages mentioned escape. Does the shooter 's attention escape that the maneuver cartridge device is not attached and therefore is pushed forward by the compression spring and fires Then protect a maneuver cartridge, then it will Maneuver cartridge device not like a rifle grenade hurled in front, but the powder gases can move sideways flow out; at most, the maneuver cartridge device falls Ground.

According to claim 2, it is advantageous that at the free end of End connector on its outer circumference a seal to gas-tight engagement in the coaxial, cylindrical bore the muzzle fire damper is arranged. This will the otherwise occurring erosion at the gap between the end pieces and bore wall prevented and at the same time the precise Guaranteed fit of the maneuvering cartridge device.

In addition, sticking the muzzle fire damper over through an axially extending sealing gap the residues of penetrating launch gases prevented, because due to the seal, these gases do not penetrate into the gap on.

A soft plastic ring or the like could be used as a seal. be used advantageously; according to the invention (claim 3) however, it is preferred that the seal at least has a piston ring-like sealing ring. Such a Sealing ring can be made of steel, hard and possibly reinforced Plastic or other piston ring material exist and has because of the stiff piston ring material the advantage that this is not in a big one Gap between the end connector and the bore wall due to the pressure can be pressed into it. So they are bigger, still permissible tolerances possible.

As already indicated above, the maneuver cartridge device could screwed to the muzzle flash damper or barrel. According to claim 4, however, it is particularly advantageous that with the maneuver cartridge device pushed onto the muzzle flash damper its rear end over a shoulder or the rear end of the muzzle flash damper forming a shoulder extends and that at the rear end of the Maneuver cartridge device one behind the shoulder Lock is attached. The maneuver cartridge device is therefore attached so that it is in a handle, so to speak can be put on, the above Compression spring ensures that it is only in when you put it on its position remains when the lock is effective has become.

The catch could have radial claws that the reach behind the shoulder. Preferred (claim 5) but the locking from a non-radial, transverse Blocking element formed. This can be done via a engage a larger angular range with the shoulder as a radial element, so that only one such Locking element can be completely sufficient.

In the formation of the locking element, it is according to claim 6 particularly advantageous that the locking element in a Cross groove of the maneuvering cartridge device or its sleeve can be moved is arranged, and that the locking element a Training that is not fully held Locking element over the outer contour of the maneuvering cartridge device or its sleeve, preferably on the top, protrudes. The locking element thus forms a clearly visible one Signs of whether the lock is closed or not if the compression spring or the like due to dirt. should be ineffective if after a long time Use of the weapon in maneuvering from any Reasons should loosen the locking element.

Here, the locking element is preferably according to claim 7 Jack formed, which is pivotable at one end in the Cross groove is mounted, the pawl by means of a Pawl spring with its free end in a counter training is pressed and trained as a handle is in the transverse groove with the latch fully held fully immersed.

With a jack, a small change in angle in the Location of the pawl to make the handle clearly visible from the To let Quernut emerge. The pawl spring prevents however, a release of the pawl due to inertial forces. In addition, the handle can in the counter training sunken jack not with your finger from the outside or a similar blunt object that an accidental release of the pawl even then seems impossible if the shooter gets through Bushy crowds.

Fig. 1

ein vergrößerter Längsschnitt durch die Mündung einer Handfeuerwaffe mit aufgeschraubtem Mündungsfeuerdämpfer und aufgesetztem Manöverpatronengerät gemäß einer ersten Ausführungsform der Erfindung ist,

Fig. 2

ein Querschnitt durch das in Fig. 1 gezeigte Manöverpatronengerät ist und dessen Halterung zeigt,

Fig. 3

ein vergrößerter Längsschnitt durch die Mündung einer Handfeuerwaffe mit aufgeschraubtem Mündungsfeuerdämpfer und aufgesetztem Manöverpatronengerät gemäß einer zweiten Ausführungsform der Erfindung ist, die mit einer Druckfedereinrichtung ausgestattet ist, und

Fig. 4

die Anordnung der Fig. 3 zeigt, jedoch mit nur lose aufgesetztem Manöverpatronengerät.

To remove the maneuvering cartridge device, the handle can be pushed back against the action of the pawl spring by means of the tip of a pocket knife corkscrew, gripped behind and lifted out of the transverse groove.
The object of the invention is explained in more detail, for example, with reference to the accompanying drawing, which shows a preferred embodiment of the invention and in which:

Fig. 1

FIG. 2 is an enlarged longitudinal section through the muzzle of a handgun with a muzzle-fire damper screwed on and a maneuvering cartridge device according to a first embodiment of the invention, FIG.

Fig. 2

1 is a cross section through the maneuvering cartridge device shown in FIG. 1 and shows its holder,

Fig. 3

an enlarged longitudinal section through the muzzle of a handgun with a screwed-on muzzle flash damper and attached maneuver cartridge device according to a second embodiment of the invention, which is equipped with a compression spring device, and

Fig. 4

the arrangement of Fig. 3 shows, but with only loosely attached maneuver cartridge device.

All of the figures are the same throughout Reference symbols for the same parts or elements used.

The reference numeral 1 shows the mouth of the barrel Rapid fire rifle, which has an external thread 3, behind which a protruding collar 5 is formed. With 7 the soul axis of barrel 1 is designated, which the Central axis of barrel 1, the muzzle fire damper 9 and of the maneuvering cartridge device 25.

The muzzle flash damper 9 is from a central bore interspersed, the individual sections from back to front in succession the following are: a center hole 11, which is centered on the collar 5, a Internal thread section 13, which on the external thread 3rd is screwed on, a coaxial, cylindrical bore 15, whose diameter is larger than that of the barrel bore, and an expanding bore 17 with a cylindrical Section begins whose diameter is larger than that of the coaxial cylindrical bore 15, and in a section that widens conically towards the front transforms.

The wall of the muzzle fire damper 9 is in the range of widening bore 17 of six longitudinal slots 19th which penetrates the scattering of the muzzle of barrel 1 cause launching gases. In the top of the Federal 5 of barrel 1 is a recess formed in which can be a securing clip 21 that is close attached to the rear end of the muzzle flash damper 9 and is the accidental release of the Muzzle fire damper 9 prevented.

In the front peripheral edge of the muzzle fire damper 9 are two notches opposite each other (not shown) trained to apply a key with which the Muzzle flash damper 9 can be screwed on and off. The maneuvering cartridge device 25 has an outer, tubular one Sleeve 27 on, in which the rear part of the inner bore is designed to fit over the muzzle flash damper 9 to be put off.

The front fifth of the inner bore of the sleeve 27 has a slightly smaller diameter than the rest Inner bore and merges into this in a paragraph. The front end of the inner bore is again in diameter downsized. Fits with a snug fit in the inner bore Block 29, which in turn has a head 31, a shoulder 33 and has an end connector 35. Here the head points an essentially cylindrical outer contour and sits fits in the foremost fifth of the inner bore of the sleeve 27, where it ends shortly before its reduced front end. In the peripheral surface of the head is a two-course Trapezoidal thread cut, the groove of which faces outwards from the Inner wall of the sleeve 27 is covered, so that a helical Channel 37 is formed.

The shoulder 33 is cup-shaped, with one after rear open, central recess by a circumferential cuff is surrounded. This circumferential cuff fits fits in the larger part of the inner bore, on its shoulder the shoulder 33 sits. Through the circumferential sleeve of the Shoulder 33 and the wall of the sleeve 27 extends indented pin 49, which the block 29 in the sleeve 27th holds on, but can be penetrated inside, so that, if necessary, for repair purposes, the Block 29 can be removed from the sleeve 27.

Extending from the center of the bottom of the recess a central end connector 35 to the rear, the middle of a blind hole 39 is penetrated, the front in the head 31st ends. The blind bore is just before reaching its end 39 through a transverse bore (no reference number) with the connected to the rear end of the helical channel 37. The blind bore 39 opens into one coming from the front Initial section 41 with an enlarged diameter, the at the rear end of the end connector, the bore of the barrel 1 opposite (Fig. 1), opens. The diameter of the Initial section 41 is a little larger than the inside diameter of barrel 1, while the diameter of the Blind hole 39 is significantly smaller. The conical transition lies between the initial section 41 and the blind bore with a maneuvering cartridge device in the area of the rear end of the expanding bore 17 (Fig. 1).

Near its rear end is the outside diameter of the End piece 35 enlarged and forms a forward pointing stop 43 against which a ring 45 from the front is present. Between this ring 45 and the bottom of the cup-shaped Shoulder 33 is in the embodiment of FIG. 3 and 4, a compression spring 47 is used, the end connector 35th surrounds and the ring 45 back against the stop 43 presses.

In the hidden end of the end piece 35 is an annular groove designed in which three sealing rings 51 sit side by side, the piston rings resemble. As can be seen from Fig.1 the concealed end of the end connector 35 sits on attached maneuver cartridge device 25 exactly in the coaxial, cylindrical bore 15 and seals against the wall from. The mouth of the initial section lies here 41 the blind bore 39 exactly the mouth of the Run 1 opposite with a small distance.

The compression spring 47 and the ring 45 of the embodiment of the 3 and 4 are missing in the embodiment of FIG. 1 Put on the maneuvering cartridge device 25 according to FIG. 3 or 4 on the muzzle fire damper 9, the end piece is first inserted into the widening bore 17 until the ring 45 abuts a shoulder 65 (Fig. 4). Now will that Maneuver cartridge device 25 is pushed on even further this only against the resistance of the more and more compressed Compression spring 47 possible, if you do that Maneuver cartridge device in this state lets go of this immediately presses forward again into the position of FIG. 4. Only when a lock 53 (see FIG. 2) the maneuvering cartridge device 25 holds, it remains in Fig. 3rd shown location.

The lock 53 is constructed as follows: in one Cross groove 57 (Fig. 2) is near the rear end of the sleeve 27 a transverse pawl 55 arranged with a Elongated hole (58) is pivotally mounted on a longitudinal pin (56) is arranged near one end of the transverse groove 57. there a pawl spring 59 presses the pawl 55 from the longitudinal pin path. There is a second one near the other end of the transverse groove Longitudinal pin (60) arranged, and the free end of the pawl 55th has a notch that is complementary to the contour of the second longitudinal pin is formed.

The pawl 55 has a handle 61 on its upper side on, the tip of which, when the pawl 55 is engaged, straight into the Submerge Quernut 57 so that it is flush with the top edge completes.

When placing the maneuvering cartridge device 25 on the muzzle flash damper 9, the pawl 55 is so far up folded that it releases the inner contour of the sleeve 27. Now the maneuvering cartridge device 25 against the force of the Compression spring 47 pushed back until the shoulder 33 on the front end edge of the muzzle fire damper 9 is seated. Now the handle 61 on the pawl 55 with your thumb pressed down and the pawl 55 is in the transverse groove 57 pivoted downwards. The pawl 55 dives into the transverse groove 57 until the handle 61 is under the thumb slips out and completely at the top of it the transverse groove 57 is pressed. Now the notch clicks into place free end of the pawl 55 in the second longitudinal pin and can only be solved by applying the force required to Compression of the pawl spring 59 is required. The Pawl 55 engages behind the rear end of the muzzle flash 9. In addition, the force of the compression spring 47 presses the Pawl 55 against this rear end of the muzzle flash 9, so that the pawl 55 in addition by friction their position is kept.

To remove the maneuvering cartridge device 25, this becomes short pressed against barrel 1 from the front, simultaneously e.g. with a nail against the handle 61 in the longitudinal direction the pawl 55 is pressed. The pawl spring 59 compressed and the notch at the free end of the pawl 55 moves away from the second longitudinal pin (60) until the pawl 55 due to the eccentric force exerted on it upwards pivots.

When firing with a maneuver cartridge, the launch gases occur into the blind bore 39 and pass through the transverse bore (no reference number) into the helical channel 37, which they leave at its front end, passing through the sleeve 27 emerge. Any particles that are in the Gas flow entrained also get into the helical channel 37 and pass it with such a high Speed that after leaving through the Centrifugal force pressed against the inner surface of the sleeve 27 where they are then slowed down before they get this can leave through its narrowed mouth. Because of the high flow resistance of the outflow path Blind bore 39, cross bore and helical channel 37 there is a gas jam, the gas pressure in run 1 so far let the rapid-fire rifle rise all Can perform charging functions without problems.

Accidentally becomes a sharp cartridge when attached Maneuver cartridge device 25 fired, then it arrives Storey unimpeded through the initial section 41 to in the blind bore 39, the diameter of which is significantly smaller than that of the projectile. This is therefore in the Blind hole 39 deformed and braked and deformed in turn the front part of the end piece 35. Its the rear part with the thickened end remains undeformed. The bullet material now collects on the floor the blind bore 39 on, while the launch gases behind the Projectile material can escape through the transverse bore (50). The pawl 55, which is subjected to shear, also withstands the Firing a sharp cartridge, occurring, increased Load so that the (albeit damaged) Maneuver cartridge device 25 from the muzzle flash damper 9 can be removed. There may even be one Repair possible because the sleeve 27 may has remained undamaged and the damaged block 29 can be removed by knocking out the pin 49.

The sleeve 27 has passages 63; if the maneuver cartridge device 25 is not locked and the position of Fig. 4 takes, and if in this state a cartridge is fired, then the launch gases escape through the Longitudinal slots 19 of the muzzle fire damper 9 and Passages 63 in the sleeve 27 of the maneuvering cartridge device 25.

Claims (7)

1. Handgun with a barrel (1),

   with a muzzle flash reducer, which

   is arranged at the muzzle end of the barrel (1),

   at one end has a cylindrical bore (15), which adjoins the mouth of the barrel (1), which is coaxial with the bore of the latter and the diameter of which is greater than that of the barrel bore, and

   has a widening bore (17) which extends from the end of the coaxial cylindrical bore (15) as far as the other, front end of the muzzle flash reducer (9) and has gas outlet openings (19) in its wall,

   and with a blank firing attachment (25) which can be pushed on over the muzzle flash reducer (9) and can be secured on the latter or the barrel (1) and which

   has a block (29) which has a blind hole (39) which is narrower than the barrel bore and

   has a small and preferably non-rectilinear gas outlet duct,

   the block (29) being extended at the rear by an end stub (35) and being capable of being brought into engagement with the coaxial cylindrical bore (15) of the muzzle flash reducer (9),

   characterised by a compression spring (47), which acts between the muzzle flash reducer (9) and the blank firing attachment (25), which is compressed when the blank firing attachment (25) is secured and, when the blank firing attachment (25) is undone, pushes it forwards to such an extent that the powder gases escape from the barrel (1) in front of the block through the gas outlet openings (19) of the muzzle flash reducer (9).
2. Handgun according to Claim 1, characterised in that a seal (51) for gas-tight engagement in the coaxial cylindrical bore (15) of the muzzle flash reducer (9) is arranged at the free end of the end stub (35), on the outer circumference of the latter.
3. Handgun according to Claim 2, characterised in that the seal has at least one sealing ring (51) similar to a piston ring.
4. Handgun according to one of Claims 1 to 3, characterised in that, with the blank firing attachment (25) mounted on the muzzle flash reducer (9), the rear end of the attachment extends beyond a shoulder or the shoulder-forming rear end of the muzzle flash reducer (9), and in that a catch (53) which engages behind the shoulder is mounted on the rear end of the blank firing attachment (25).
5. Handgun according to Claim 4, characterised in that the catch (53) is formed by a non-radial, transversely extending locking element (55).
6. Handgun according to Claim 5, characterised in that the locking element (55) is arranged in a moveable manner in a transverse groove (57) of the blank firing attachment (25) or its sleeve (27), and in that the locking element (55) has a feature (61) which protrudes beyond the outer contour of the blank firing attachment (25) or its sleeve (27), preferably on the upper side, if the locking element (55) is not held fully.
7. Handgun according to Claim 6, characterised in that the locking element is designed as a pawl (55) which is mounted pivotably at one end in the transverse groove (57), in that the free end of the pawl (55) is pressed into a mating feature by means of a pawl spring (59), and in that the feature is designed as a handle (61), which retracts fully into the transverse groove (57) when the pawl (55) is held fully.

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