JP2012172456A - Portable key insertion auxiliary tool for lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key insertion auxiliary tool for a lock, capable of automatically guiding an insertion portion of a key to a keyhole and inserting the key into the keyhole.SOLUTION: A key insertion auxiliary tool for a lock comprises: a key 11 supported by an outer cylindrical body 1 through a key guide 7 in a backward movable and rotatable manner; a connecting body 21 for engaging with the outer cylindrical body through guide means 3 and 23 in a backward movable manner in a non-rotation state, and protruding from a tip opening 4 of the outer cylindrical body; a key return spring 31 for continuously urging the key toward a protruding direction; a connecting body return spring 41 for continuously urging the connecting body toward the protruding direction. The key is provided with an engaging part 51 for stopping the rotation of the key on a back end portion side of the key. When the key is inserted into a keyhole a, holding the outer cylindrical body and pressure-contacting an insertion portion of the key to the keyhole in a crossing state allow the key to rotate through the key guide to match the insertion portion with the keyhole. Thereafter, when the connecting body is retracted to a predetermined position while being pressed against a circumferential wall of the keyhole and the insertion portion completely enters the keyhole, an engaging back end portion of the connecting body is engaged with the engaging part of the key to integrally connect the outer cylindrical body, the connecting body and the key.

Description

  The present invention relates to a portable lock key insertion aid.

  In Patent Document 1, “from the viewpoint of barrier-free, the purpose is that the lock can be easily unlocked by pushing the key with a finger”, and “the cam engagement portion and the tip surface on the outer surface of the cylindrical cam. A lock key is disclosed which includes a key body having a blade portion and a storage case having a curved control guide portion that is externally fitted to the cam and engages with the cam engaging portion.

  This lock key is portable as in the present invention, and is intended to easily lock and unlock the lock, but the intended purpose of the present invention is the keyhole shape of the lock. Even if the keyhole angle does not match the key insertion angle, regardless of whether it is horizontal or vertical, the tip of the lock key insertion aid is pressed around the lock keyhole. Since the key insertion portion is automatically guided to the keyhole and can be easily locked and unlocked, the problems and configurations of the invention are different.

  Patent Document 2 describes a key storage case that includes an outer cylinder and an inner cylinder that is removably fitted to the outer cylinder. FIG. 1 shows an outer cylinder similar to the present invention. The matter of pressing the front end surface of the inner cylinder body around the keyhole of the lock while holding is described.

  However, the object of the invention of Patent Document 2 is to provide a key usage detecting means at a low cost without remodeling the lock, and the problems and configurations of the invention are different as in Patent Document 1.

JP 2007-162230 A FIG. 1 of Japanese Patent Laid-Open No. 2001-207701

  The first object of the present invention is to determine the keyhole of the lock even if the keyhole angle does not match the key insertion angle, regardless of the shape of the keyhole of the lock, horizontal direction or vertical direction. It is to automatically guide and insert the insertion portion of the key into the keyhole while pressing the tip of the lock key insertion aid around. The second purpose is that when the key hole angle and the key insertion angle do not match, the outer cylindrical body, the connecting body (for example, the inner cylindrical body, the rod-shaped body) and the key are integrated with each other regardless of the angle difference. It is to realize the lock / unlock operation of the lock by combining them. The third purpose is to ensure that the coupling body captures the key during the locking / unlocking operation of the lock. The fourth object is to expand the range of the rotation angle of the key body, and for example, it can be applied to a case where the key insertion portion is a flat blank key having no plural grooved grooves on both side edges.

  The portable lock key insertion assisting device according to the present invention includes a key supported on an outer cylinder through a key guide so as to be reversible and rotatable, and a reciprocating motion in a non-rotating state on the outer cylinder via a guide means. A connecting body that engages and projects from the front end opening of the outer cylinder, a key return spring that always biases the key in the projecting direction, and a connection body return spring that always biases the connecting body in the projecting direction In addition, an engagement portion for stopping rotation of the key is provided on the rear end side of the key, and when inserting the key into the key hole, the key insertion portion intersects the key hole with an outer cylinder. The key is rotated through the key guide so that the insertion portion coincides with the keyhole of the lock, and then the connecting body is pressed around the keyhole (including a part) of the lock to a predetermined position. And when the insertion part is completely inserted into the keyhole Characterized in that said connecting body connecting body and the key and the outer cylinder engaged with the engaging portion of the engaging rear end keys are integrally coupled respectively.

(A) Even if the key 11 is not exactly aligned with the keyhole a, the key 11 is automatically guided to the keyhole a by simply holding and pressing the outer cylinder, so that the insertion is easy. Further, the locking / unlocking operation of the lock can be performed with the outer cylinder pressed against the lock. In addition, not only when the angle of the key 11 and the angle of the keyhole a completely coincide with each other, but also when the angles of both do not coincide with each other, the front end surface of the coupling body (for example, the inner cylinder body, the rod-shaped body) 21 is attached to the lock X. When the outer cylinder 1 is pressed while being applied to the periphery b of the key hole a, the key 11 that presses against the periphery b is rotated, and finally, the insertion portion is guided and inserted into the key hole a. Then, the connecting body 21 moves backward, the rear end portion captures the engaging portion of the key 11, and the constituent members 1, 11, and 21 are integrally coupled, so that the lock can be applied with a simple procedure.・ Can be unlocked.
(B) In the invention according to claim 2, at least one engaging tooth or engaged tooth is formed at the rear end portion of the inner cylindrical body 21 as an example of the connecting body, and on the other hand, for the key rotation stop. Since the engaged portion or the engagement tooth that fits into and disengages from the engagement tooth or the engaged tooth is formed in the engaging portion, the outer cylinder is interposed through the engaging portion 51 for stopping the key rotation. The inner cylindrical body 21 is integrated. When the connecting body is a rod-like body or a similar type, one or more engaging teeth or engaged teeth formed at the rear end of the connecting body are fitted to the engaging portion 51 for stopping the key rotation. Or engage.
(C) In the invention according to claim 3, the engagement portion 51 for stopping the rotation of the key is fitted on the shaft 16 constituting the key 11, and a gear is formed on the outer peripheral surface of the hook-like engagement portion 51, for example. Since the engagement teeth 51a are formed, the key 11 and the inner cylinder 21 are firmly coupled.

FIG. 1 to FIG. 15 are explanatory views showing the best example (first embodiment) of the present invention. FIG. 16 and FIG. 17 are each explanatory views showing the best example (second embodiment) of the present invention.
Schematic explanatory drawing (conceptual diagram) showing the overall environmental state of the present invention. Schematic explanatory drawing (conceptual figure) of an initial state (before pressing the front end surface of a coupling body around the keyhole of a lock). FIG. 3 is an end view taken along line 3-3 in FIG. 2. FIG. 4 is an end view taken along line 4-4 of FIG. Explanatory drawing which shows the principal part (engagement part for a key rotation stop, etc.). The schematic explanatory drawing which showed the outer cylinder body in the longitudinal cross-section. The perspective view which showed the outer cylinder body in the longitudinal cross-section except the return spring. Explanatory drawing of the principal part (an inner cylinder can move in a non-rotating state). FIG. Explanatory drawing of the 1st step which held the outer cylinder body and pressed the front end surface of the inner cylinder body around the keyhole of a lock. Explanatory drawing that the key is rotatable. Explanatory drawing by which a key is guided to the key guide of an outer cylinder (it retreats, rotating). Explanatory drawing which the rear-end part of an inner cylinder fits in the engaging part of a key. Explanatory drawing in which the insertion part of the key has completely entered the keyhole of the lock. Explanatory drawing to the effect that an inner cylinder, a key, and an outer cylinder can rotate integrally. Explanatory drawing of the normal time of 2nd Embodiment (an example in which a connection body is a rod-shaped body). Explanatory drawing of the state which the rod-shaped coupling body moved backward in the non-rotation state, and was fitted or engaged with the engaging part of the key.

  Hereinafter, the best mode for carrying out the present invention shown in FIGS. 1 to 15 will be described.

(1) Environment for Implementing the Invention FIG. 1 is a schematic explanatory diagram showing the environment for implementing the invention. FIG. 2 is a schematic explanatory view before the front end surface of the coupling body (for example, the inner cylinder body) is pressed around the lock keyhole.
1 and 2, X is a lock, a is a key hole of the lock, b is the periphery of the key hole (front surface), Y is a door, and Z is a portable key insertion aid for a lock according to the present invention ( Hereinafter, it is referred to as a “key insertion aid”.

  As shown in the conceptual diagrams of FIGS. 1 and 2, the key insertion assisting tool Z includes an outer cylinder 1 having a key guide 7 at the rear end, and the key A key 11 supported so as to be retractable and rotatable via a guide 7 is fitted to the outer cylinder 1 so as to be retractable in a non-rotating state via guide means 3 and 23, and the outer cylinder 1 And an inner cylindrical body 21 as an example of a connecting body that covers a part or all of the key, and is provided in the key guide 7 and always projects the key 11 in the protruding direction. A key return spring 31 that biases the connecting body 21 and a connecting body return spring 41 that is provided in the inner space 2 of the outer cylindrical body 1 and constantly biases the connecting body 21 in the protruding direction. 11 is provided with an engaging portion 51 for stopping key rotation at a portion near the rear end of the connecting body 21. When the rear end portion of the connecting body 21 is retracted to a predetermined position while being pressed against the periphery b of the key hole a of the lock X, the rear end portion of the connecting body 21 is fitted into the engaging portion 51 so that the outer cylinder 1, the key 11, and the connecting body 21 are connected. They are joined together. Hereinafter, the specific requirements of the present invention will be described in order, but the detailed matters are omitted as much as possible.

(2) Key hole a of lock X
The key hole a of the lock X may be either horizontal or vertical. In addition, the shape of the key hole a is, for example, one having notched key grooves on both side edge portions of the insertion portion referred to as a blade portion, or a geometric groove, inverted frustoconical recess on a flat surface referred to as a blank key, etc. It is sufficient that each of those having a can be inserted. As shown in FIGS. 7 and 11 and the like, the key of this embodiment is called a blank key, and the key hole a of the lock X is, for example, a simple horizontal hole.

(3) Outer cylinder 1 of the key insertion aid Z
3 is an end view taken along line 3-3 in FIG. As shown in FIG. 3, the key insertion assisting tool Z includes an inner cylindrical body 21 as an example of a coupling body and an outer cylindrical body 1 that is externally fitted to the inner cylindrical body. The key 11 indicated by hatching is located at a substantially central portion of the internal space 22 of the inner cylinder 21. Both the inner cylindrical body 21 and the outer cylindrical body 1 are formed in a cylindrical shape. In this embodiment, the plurality of engaging projections 23, 23 constituting one of the guiding means are the left and right of the outer peripheral wall of the pipe-shaped inner cylindrical body 21. A pair of engaging grooves 3, 3 constituting the other of the guide means is formed in the left and right portions of the inner peripheral wall of the outer cylindrical body 1 along the length direction. Since the engagement protrusions 23 and 23 of the inner cylinder 21 are engaged with the engagement grooves 3 and 3 of the outer cylinder 1, the inner cylinder 21 is connected to the outer cylinder 1 via the guide means 23 and 3. Thus, it is fitted in a non-rotating state and capable of moving backward.

  Here, the configuration of the outer cylinder 1 will be briefly described with reference to FIG. 2. Reference numeral 2 denotes an inner space of the outer cylinder 1, and the inner space 2 includes an annular stopper portion 5 that forms an open end 4. This is a region between the inner surfaces of the short cylindrical key guides 7. Therefore, the engagement grooves 3 and 3 described above are formed in a streak (straight shape) in the internal space 2.

(4) Key guide 7
4 is an end view taken along line 4-4 of FIG. As shown in FIG. 4, the short cylindrical key guide 7 has one or a plurality (in this embodiment) of spiral guide grooves 8 and 8 in the central hole 12 corresponding to the central portion of the key insertion auxiliary tool Z. These helical guide grooves 8 and 8 are engaged with single or plural (this embodiment) small protrusions 13 and 13 protruding from the outer peripheral wall of the rear end portion of the key 11.

  Therefore, the long key 11 is supported by the outer cylinder 1 through the key guide 7 so as to be retracted and rotatable. In the present embodiment, the outer cylindrical body 1 and the key guide 7 provided in the rear end portion of the outer cylindrical body are formed integrally, for example, but depending on the embodiment, for example, the outer cylindrical body 1 and the key Each guide 7 is molded separately from a hard synthetic resin, and a short cylindrical key guide 7 is fixedly incorporated in the rear end portion of the long cylindrical outer cylinder open at both ends. The end opening may be closed with a lid (substantially the same). In addition, one or a plurality of spiral guide grooves 8 are formed on the outer peripheral wall of the rear end portion of the elongated key 11, and one or a plurality of small protrusions 13 that engage with this are formed in the central hole 12 of the key guide 7. It may be provided on the inner peripheral wall (substantially the same).

(5) Linked body 21
As shown in FIG. 2, the inner cylinder 21 as an example of the connecting body protrudes from the front end opening 4 of the outer cylinder 1 by the spring force of the connecting body return spring 41 and is behind the key 1 in the initial state. The insertion portion of the key 1 is covered except for the rear end portion having the engaging portion 51 and the small protrusions 13 and 13 fixedly provided at the portion near the end portion. In other words, the inner cylinder 21 has, for example, a flange-shaped contact portion 24 on the outer peripheral wall on the rear end side so as not to be detached from the front end opening 4 of the outer cylinder 1 in the initial state. The portion 24 is in pressure contact with the stopper portion 5 of the outer cylinder 1.

  Although the inner cylinder 21 does not capture the key 1 in the initial state, the inner cylinder 21 is pressed against the periphery b of the key hole a of the lock X and the connecting body return spring 41 as described later. The rear end portion engages (captures) the engagement portion 51 of the key 1 in a fitted state when it is retracted to a predetermined position against the spring force.

  As a result, the outer cylinder 1, the key 11, and the inner cylinder 21 are integrally coupled. In the present embodiment, the inner cylinder 21 substantially entirely covers the insertion portion of the key 11, but this is not an essential matter of the invention, and the insertion portion of the key 11 is the front end surface of the inner cylinder 21. It may protrude from.

(6) Engagement portion 51, connecting body return spring 41
FIG. 5 is an explanatory view showing the main parts such as the engaging portion 51 for stopping the key rotation and the return spring 41 for the connecting body. In this figure, reference numeral 41 denotes a connecting body return spring, and the connecting body return spring 41 is inserted between the rear end inner surface 21 a of the inner cylinder 21 and the front end inner surface 7 b of the key guide 7. Yes.
In this embodiment, for example, the key rotation stop engaging portion 51 is fixedly fitted to a portion near the center portion or the rear end portion of the key 11, and the engaging portion 51 has an elliptical or annular shape. And one or a plurality of engaging teeth 51a are formed on the outer periphery thereof. The engaging portion 51 has a non-round or square fitting hole at the center thereof.

  By the way, in the present embodiment, the engaging portion 51 is provided in a hook shape near the rear end of the key 11, and the hook-like engaging portion 51 has at least one engaged tooth or engagement. The artificial tooth 51a is formed.

  In addition, at least one engaging tooth or engaged tooth is formed on the inner peripheral wall of the rear end portion of the inner cylindrical body 21, while the outer peripheral surface of the engaging portion 51 for stopping key rotation is Engagement teeth or engagement teeth 51a are formed to be fitted to and disengaged from the engagement teeth or engagement teeth. Of course, each shape of the hook-like engaging portion 51 and the engaging teeth 51a is a matter that can be arbitrarily changed in design as long as the engaging portion 51 and the key 11 can be integrally engaged and disengaged.

  Further, although not shown in particular, the engagement / disengagement structure between the engagement rear end portion 22 of the cylindrical coupling body 21 and the engagement portion 51 for stopping the rotation of the key is a well-known and well-known clutch mechanism (of the opposing surfaces of the disk body). Unevenness, frictional engagement with a rubber plate, etc.).

(7) Key return spring 31
For example, as shown in FIG. 6, the key return spring 31 is provided between the inner surface of the rear wall (a lid in some embodiments) that forms the central hole 12 of the key guide 7 and the rear end surface of the key 11. The key 11 is always urged in a protruding direction. The urging force of the key return spring 31 is set to be stronger than that of the connecting body return spring 41 located in front. The wire diameter, the number of turns, the strength, and the like of the key return spring 31 and the connecting body return spring 41 are matters that are appropriately set in consideration of the rotation and retraction of the key 11 and the retraction movement of the inner cylinder 21. .

(8) Details of Implementation Levels of Key 11, Outer Cylindrical Body 1, etc. Here, the configuration of the implementation levels of the key 11, outer cylinder body 1, etc. will be described with reference to FIG. First, reference numeral 15 denotes a shaft constituting the key 11, and a gear-like engagement portion 51 is fixedly fitted to the angular shaft portion of the shaft 15. Reference numeral 16 denotes a key body having an insertion portion, and the rear end portion of the key body 16 is located on the distal end side of the shaft 15 via a slightly thick fixed plate 17 as a key pressing member and a plurality of fixing tools 18. It is fixed. A plurality of small protrusions (engaging portions) 13 are provided at the rear end portion of the shaft 15, and these small protrusions 13 are formed on the inner peripheral wall of the central hole 12 of the key guide 7 as described above. Are respectively engaged with the spiral guide grooves 8 and 8.

  Therefore, when the key 11 is retracted in the axial direction via the key guide means (the small protrusion 13 and the spiral guide groove 8), the key 11 is retracted while rotating. FIG. 11 is an explanatory diagram showing that the key 11 can be rotated.

  Next, the outer cylindrical body 1 of the embodiment is divided into two in the length direction from the center portion in consideration of the problem of ease of assembly, and has a form in which, for example, bamboo is broken. The split outer cylinder pieces 1a and 1b thus divided into two have an unnumbered fixing tool at the rear end or the like, and are united using a plurality of fixing tools 6.

(9) Procedure / Action As shown in FIGS. 1 and 2, etc., at the initial position (normal position when carried), the inner cylinder 21 is opened at the tip of the outer cylinder 1 by the spring force of its own return spring 41. 4 protrudes. The key (key body 16) 11 also protrudes from the distal end opening 4 of the outer cylinder 1 by the spring force of its own return spring 31. The front end surface of the inner cylinder 21 and the front end surface of the insertion portion of the key (key body 16) 11 are substantially at the same position.

  FIG. 10 is an explanatory diagram of a first stage in which the outer cylinder 1 is held and the front end surface of the inner cylinder 21 is pressed against the periphery b of the key hole a of the lock X. Therefore, the outer cylinder 1 is held and pressed in the direction of arrow A. In this case, as a matter of course, when the key hole a of the lock X and the distal end surface of the insertion portion of the key 11 coincide with each other, the insertion portion of the key 11 remains as it is in accordance with the backward movement of the inner cylinder 21. Enter a (key non-rotating).

  However, the detailed description of the embodiment is omitted here in relation to the intended purpose of the invention. The problem here is when the distal end surface of the insertion portion of the key 11 does not match the key hole a. For example, the distal end surface of the insertion portion is 45 degrees or 50 degrees with respect to the horizontal or vertical key hole a. This is the case where the angle is 90 degrees, specifically.

  In such a case, when the outer cylinder 1 is pressed in the direction of arrow A, the distal end surface of the insertion portion of the key 11 is pressed against the edge of the key hole a simultaneously with the inner cylinder 21 (simultaneous pressure contact). As shown in FIG. 12, the key 11 is guided by the key guide 7 of the outer cylinder 1, and moves backward in the arrow B direction while rotating in the arrow C direction. At this time, the inner cylinder 21 also moves backward simultaneously. As described above, when the key insertion assisting tool Z is held and pressed against the front surface of the lock, the insertion portion of the key 11 is automatically guided so as to coincide with the keyhole.

In some embodiments in which the amount of protrusion of the coupling body is short, the distal end surface of the coupling body 21 is in pressure contact with the periphery of the keyhole a after the distal end surface of the key 11 is pressed against the edge portion of the keyhole a (unusual pressure welding).
FIG. 13 is an explanatory view in which the rear end portion of the inner cylindrical body 21 is externally fitted to the engaging portion 51 of the key 11 (second stage). In this second stage, as shown in FIG. 14, the distal end surface of the insertion portion of the key 11 rotates while being pressed against the edge portion of the keyhole a, and the angle of the key 11 and the angle of the keyhole a completely coincide with each other. 11 insertion portions enter the keyhole a.

  When the angle of the key 11 and the angle of the key hole a completely coincide with each other, holding the outer cylinder 1 as it is and pressing it further in the direction of the arrow A, the insertion part of the key 11 is inserted into the key hole a and at the same time the inner cylinder The body 21 is retracted to a predetermined position while being guided by the guide means 3 and 23 in a non-rotating state and against the spring force of its own return spring 41. As a result, the engagement rear end portion having the engaged teeth engages with the engagement teeth 51a of the engagement portion 51 of the key 11 (external fitting in the embodiment).

  FIG. 15 is an explanatory diagram showing that the inner cylinder 21, the key 11, and the outer cylinder 1 can rotate together. At the time of fitting, the inner cylinder 21 and the key 11 engage with each other as the engaging part and the engaged part, and the inner cylinder 21 and the outer cylinder 1 are guided by the guide means (the streaky engaging groove 3, the engaging part). Since they are integrally engaged via the projections 23), the outer cylinder 1 can be held and operated in the application / unlocking direction.

  In the example shown in the embodiment of the invention, it has been explained that the connecting body 21 is a cylindrical body, but the shape is not necessarily limited to the cylindrical body (inner cylindrical body). Since it is sufficient for the connecting body 21 to move backward in a non-rotating state and engage with the engaging portion 51 of the key 11 (switch function or capture engagement function with respect to the outer cylinder), the form thereof is The design can be arbitrarily changed without departing from the object of the invention.

  FIG. 16 and FIG. 17 are explanatory diagrams showing the best example (second embodiment) of the present invention. As is apparent from this figure, the connecting body 21A is a rod-like body in whole or in part, and the distal end portion 21b that partially protrudes from the outer cylinder 1 and has a fingertip bent is formed by the lock X described above. It is a part which press-contacts to the circumference | surroundings (a part is included) b of the keyhole a.

  In other words, the connecting body 21A is formed by partially cutting off the tip side of the cylindrical body according to the first embodiment. Even if configured in this way, the intended object of the present invention can be achieved. .

  In the present embodiment, the connecting body return spring 41 is entirely housed in the internal space 2 of the outer cylindrical body 1, but it is not always necessary to place all of the interior in the internal space 2. It may be positioned in the space 2 and may be supported in a state in which the tip end side is housed in the connecting body (inner cylinder) 21.

  The present invention is mainly used in the locksmith and joinery industries.

X ... Lock, a ... Keyhole, b ... Around the keyhole, Y ... Door, Z ... Lock key insertion aid, 1 ... Outer cylinder, 2 ... Internal space, 3 ... Guide means (engagement groove), 4 ... Tip opening, 5 ... stopper portion, 7 ... key guide, 8 ... key guide means (spiral guide groove), 11 ... key, 12 ... central hole, 13 ... small projection, 15 ... shaft, 16 ... key body, DESCRIPTION OF SYMBOLS 21 ... Connection body (inner cylinder), 22 ... Internal space, 23 ... Guide means (engagement protrusion), 24 ... Contact part, 31 ... Return spring for keys, 41 ... Return spring for connection bodies, 51 ... Key rotation Stop engaging portion, 51a... Engaging tooth.

Claims (3)

A key supported by the outer cylinder through a key guide so as to move backward and rotatably, and engages with the outer cylinder through a guide means so as to be able to move backward in a non-rotating state and from a front end opening of the outer cylinder A connecting body that protrudes, a key return spring that always urges the key in the protruding direction, and a connecting body return spring that always urges the connecting body in the protruding direction, and further on the rear end side of the key. When the key rotation stop is provided, and the key is inserted into the key hole, the key is rotated through the key guide when the key insertion part is pressed against the key hole while holding the outer cylinder. Then, the insertion portion coincides with the keyhole of the lock, and then the connecting body is retracted to a predetermined position while being pressed around (including a part of) the keyhole of the lock, and the insertion portion completely enters the keyhole. In this case, the rear end portion of the coupling body is engaged with the key engagement portion. The outer cylindrical body and the coupling body and the key is the key insertion aid for padlock portable integrally coupled each. 2. The engagement rear end portion of the connecting body according to claim 1, wherein at least one or more engagement teeth or engaged teeth are formed. A portable key insertion assisting device for a lock, wherein engaged teeth or engaging teeth are formed to be fitted to and disengaged from the teeth or engaged teeth. 3. The key rotation stop engaging portion according to claim 1 or 2, wherein the key rotation stop engaging portion is provided in a radially outward form on the shaft constituting the key, and a gear-like engagement is provided on the outer peripheral surface of the engaging portion. A portable key insertion assisting tool for locks, wherein a tooth is formed.

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