JP2018184738A5 - - Google Patents

Description

Key for cylinder lock

  The present invention relates to a key for a cylinder lock. The present invention is applied to, for example, a disc tumbler tablet.

  Patent Document 1 describes "a lock device (key device) including a combination of a lock body and a key body (key plate)". Among them, in the key body (key plate) shown in FIG. 3, the interval (pitch) between the groups of notches formed on the upper and lower edges of both sides of the key body is made uneven so that "Increasing differences".

  However, since the group of indentations in Patent Document 1 are notched in the key width direction from the end faces of the side portions of the key body (key plate), respectively, they are orthogonal to the bottom surface of the valley forming the indentation, that is, the wide flat surface. The bottom of the valley is straight (vertical) toward the paper. Therefore, there are problems to be solved, such as being unable to achieve more "key difference increase", mechanical deformation easily in the case of a reversible key, and dust adhering to the bottom of the valley. ..

  In FIGS. 8 to 10 of Patent Document 2, a key material is set on a work table, and a disc-shaped rotary blade is pressed against the side surface of the key material to form a tumbler guide notch (reversible key). The technology is described.

JP-A-59-203166 8 to 10 of JP-A-9-144398.

  In view of the problems of Patent Document 1, the main problem of the present invention is to solve the problems of “increasing key differences”, “maintaining the rigid function of the blade”, and “non-adhesion of dust to the cut portion of the blade”. To achieve all.

  The key for the cylinder lock of the present invention is a key in which a cutout tumbler guide cut is formed on the side surface of the blade, and the cutout tumbler guide cut is one side of the flat surface portion of the blade. First depressions formed on the upper surface in the blade width direction (key width direction), and first depressions formed on the lower surface of one side of the flat surface portion of the blade corresponding to positions on the back side of the first notches. In addition, the sectional shape of the edge in the blade width direction passing through the center of the first and second notches is a substantially mountain shape (or roof shape) in which an inclined ridge (entity portion) is present. Is characterized in that

(A) In the invention according to claim 1, since the cross section shape of at least one guide knurl for the tumbler in the key width direction is substantially mountain-shaped, its inclined ridge portion slides against the guided portion of the movable obstacle of the lock. Contact. Therefore, for example, when the key is inserted and withdrawn, the frictional resistance with the movable obstacle can be reduced, and the operability of the key is good. Moreover, since the cross section shape of the guide notch in the key width direction is almost mountain-shaped, dust does not adhere to the inclined ridge portion and the inclined ridge portion (substantial portion) is present. There is an effect that it is stronger than the non-mountain-shaped guide notch that is linearly cut from the upper surface to the one lower surface on the opposite side. Further, depending on the embodiment, there is an effect that there are many key differences.
(B) The invention according to claim 2 has an effect that there are many key differences because the length of the hypotenuse of the second step of the guide tick for the tumbler is different from the length of the hypotenuse of the first step.
(C) The invention described in claim 3 has the same effect as the invention described in claim 1.
(D) In the invention as set forth in claim 4, in the tumbler guide notch, the length of the oblique side of the second step is different from the length of the oblique side of the first step, and the length of the oblique side of the second step is different. Two types, which are substantially the same as the length of the hypotenuse of the first step, are present at the edge portion of the side surface portion of the blade with a space therebetween, so that there are more key differences. In addition, it is possible to increase key differences.
(E) The invention according to claim 5 includes a group formed on the edge of one side surface part and a group formed on the edge part of the other side surface part, and the one group The keyholes of the inner cylinder are characterized in that the keyholes are reversible that can be used by rotating 180 degrees, including those in which the positions of the vertices of the cross-sectional shape of the guide tumbler for adjacent tumblers are different. When inserting the blade into, the directionality is not limited.
In addition, the guided portion of the two-divided movable obstacle element incorporated in the inner cylinder of the disk tumbler lock is, for example, a "claw-shaped" or "wedge-shaped" first key-shaped dented recess for a key tumbler. Fits keys for disc tumbler locks waiting for nicks and second nicks.

1 to 14 are explanatory views for explaining the configuration of a key according to the first embodiment of the present invention. 15 and 16 are explanatory diagrams for explaining the configuration of the key according to the second embodiment of the present invention.
The external perspective view which shows an example of the usage mode of a key. The schematic longitudinal cross-sectional view of the tumbler lock X shown in FIG. FIG. 3 is a schematic vertical cross-sectional view taken along a plane orthogonal to the insertion direction A of the key Y. The front view in the state where the movable obstacle child of the tumbler lock was laid down. Front view of the key. Top view of the key. Explanatory drawing which shows the characteristic part which referred to the location of the 7-7 line of FIG. Explanatory drawing which shows the characteristic part which referred to the location of the 8-8 line of FIG. Explanatory drawing of the structure of cross-sectional chevron shape. Explanatory drawing which inserted the key in the key hole (key hole of an inner cylinder). FIG. 8 is an explanatory view showing a sliding contact state between a chevron-shaped guiding portion at a cross-sectional portion of the key of FIG. 7 and a guided portion of a two-divided movable obstacle. FIG. 9 is an explanatory view showing a sliding contact state between the chevron-shaped guiding portion at the cross-sectional portion of the key of FIG. 8 and the guided portion of the two-divided movable obstacle. Explanatory drawing to the effect that an inner cylinder rotates relatively (including the cross section of the key in FIG. 7). Explanatory drawing to the effect that the inner cylinder rotates relative to one another (including the cross section of the key in FIG. 8). Front view of the key according to the second embodiment of the present invention Explanatory drawing which shows that the cross-sectional shape of a guide tumbler for tumblers and the length of the hypotenuse on the front side and the length of the hypotenuse on the back side are the same (location 16-16 of 15).

  The present invention is not a lock device composed of a lock body and a key body, but a "key" invention characterized by the "key itself". Therefore, the configuration of the key itself will be described in detail. Regarding the structure of the lock, an embodiment most suitable for the “key” of the present invention will be described, but the “key” of the present invention is limited to the disc tumbler lock described in the present specification and the drawings. If it is not a cylinder lock, basically, for example, "an outer cylinder body, an inner cylinder body that is rotatably fitted to the outer cylinder body, and a tumbler that is incorporated in the inner cylinder body. Equipped with a plurality of two-divided movable obstacles that are slidable in the radial direction against the spring force of the spring and that have a guided portion that is formed on the blade and that engages in correspondence with large and small tumbler guiding notches. , When the blade is completely inserted into the keyhole of the inner cylinder, the movable obstacles of the two-divided pieces are respectively displaced and the inner cylinder can be rotated. ..

  Now, the "key" of the present invention achieves all the problems of "increasing the key difference", "maintaining the rigid function of the blade", and "non-adhesion of dust to the cut portion of the blade". .. Then, in order to achieve each of the above-mentioned objects, a cross-sectional shape of a plurality of cords (for example, 6 to 10 cords) formed in the axial direction (insertion direction) of the blade (in the embodiment, a notch-shaped tumbler guide notch), Distance between adjacent cords, position of apex of cross-sectional chevron shape in each key width direction (depth of cut from side end face), length of left and right oblique sides of chevron cross-section of each cord in key width direction, etc. Is devised to be.

  Thus, an exemplary embodiment of the “key” of the present invention is shown in FIGS. In these figures, FIG. 5 is a front view of the key, while FIG. 9 shows the main part (blade) thereof. FIG. 9 shows the distance between adjacent cords of a plurality (for example, 6) of cords formed in the axial direction (insertion direction) of the blade B of the key Y, the position of the apex of the chevron cross section in the key width direction of each cord ( (Depth of cut from side end face), and a schematic explanatory view that the length of the hypotenuse of the chevron-shaped cross section in the key width direction of each code is different. Further, together with FIGS. 6 to 8, the key Y is 180 It shows that it is reversible that can be used by rotating it once.

Here, first, description will be made with reference to FIG. In this figure, a total of six notched tumbler guide notches 73 of different sizes are provided on one edge (upper side of the drawing) of both side surface portions 72 orthogonal to the wide flat portion 71 of the blade B, They are formed as a group of codes at different intervals P1 to P5 in the key insertion direction. On the other hand, on the other edge of the side surface portion 72 (downward in the drawing), there are a total of six notch-shaped tumbler guide notches having different sizes, and different intervals P1 to P5 in the key insertion direction. Is formed as a cord.
Since FIG. 9 is a partially enlarged view of the front view of the key, for convenience of description, here, regardless of the length of the oblique side of the tumbler guide notches 73a, 73b, a group of codes (upper edge portion of the upper group of cords visible in the front view The leading notch) is labeled 73b, while the lower group of cords (leading notch on the lower edge) visible in the front view is labeled 73a to distinguish them. This is because the tumbler guide notches 73a and 73b of this embodiment include those in which the length of one oblique side and the length of the other are different.

  Next, FIG. 6 is a plan view with respect to the front view of FIG. 5, and FIG. 7 is an explanatory view showing that the cross-sectional shape of the guide hack for tumbler and the length of the oblique side on the front side and the length of the oblique side on the back side are different (characteristic portion). Similarly to FIG. 7, FIG. 8 shows the cross-sectional shape of the guide knurling for the tumbler and the fact that the length of the oblique side on the front side and the length of the oblique side on the back side are different (characteristic portion). It is explanatory drawing (8-8 line part of FIG. 5). These figures show one feature of the key Y of the invention.

  As is clear from these figures, the key Y for a cylinder lock of the present invention is a key having a cutout tumbler guide notch formed on the side surface 72 of the blade B. The guide notch 73 corresponds to a recessed first notch 73a formed in the blade width direction (key width direction) on the one side upper surface 71a of the flat portion 71 of the blade B, and a position substantially behind the first notch 73a. It is a recessed second notch 73b formed on one side lower surface 71b of the flat portion 71 of the blade, and further, a cross section of an edge portion in the blade width direction passing through the center of the first notch 73a and the second notch 73b. The shape is a substantially mountain shape (or roof shape) in which an inclined ridge portion (substantial portion) exists.

  In the key Y of the first embodiment, for example, as shown in FIGS. 7 and 8, the lengths of both hypotenuses of the substantially mountain shape (or the roof shape) are different depending on the cross-sectional location in the key width direction. For example, in FIG. 7, the longer inclined surface 73a on the opposite side is approximately twice as long as the shorter inclined surface 73b. In FIG. 8, the length of the shorter inclined surface 73b is approximately five times that of the longer inclined surface 73a on the opposite side. In each of these figures, although the cross-sectional shape of the edge in the blade width direction that passes through the center of the first notch 73a and the second notch 73b is a substantially mountain shape in which an inclined ridge line portion (substantial portion) exists, It is shown that the lengths of both hypotenuses of the substantially chevron shape differ depending on the cross-section location, and in the embodiment, there are a total of 6 different chevron cross-section shapes, and the apex or hypotenuse length of each chevron cross-section shape is different. By doing so, we are trying to "increase key differences".

In addition, the length of the hypotenuse of the second notch 73b of the guide tick 73 for the tumbler is shorter than the length of the hypotenuse of the first tick 73a (different ticks).
However, as shown in FIGS. 15 and 16, the key Y1 of the second embodiment of the present invention is such that the length of the hypotenuse of the second notch 73b of the tumbler guide notch 73 is the length of the hypotenuse of the first notch 73a. Since the tumbler guide notch 73 has a length of the hypotenuse of the second notch 73b that is shorter than the length of the hypotenuse of the first notch 73a, the tumbler guide notch 73 is preferably the same as the above. There are two types (one with different graduations) and one with the length of the hypotenuse of the second crevice 73b being substantially the same as the length of the hypotenuse of the first crevice 73a (equal crevices). It exists with a space or with a predetermined space (equal space). Then, the tumbler guide notch 73 of the optimum embodiment has a group of one formed on the edge portion of one side surface portion and a group of one formed on the edge portion of the other side surface portion, and A group of adjacent tumblers for which the positions of the vertices P of the cross-sectional shapes of the guide hacks for tumblers are different is included, and the key Y1 (Y) is reversible that can be used by rotating it by 180 degrees.

  Next, FIGS. 1 to 4 are explanatory views showing locks suitable for application of the “key (Y, Y1)” of the present invention, in particular, a disk tumbler lock X (hereinafter referred to as “tumbler lock”). is there. FIG. 1 is an external perspective view showing a tumbler lock X of the present invention attached to a wall portion 1a of a door 1 and a duplication key Y together with it. First, in FIG. 1, X is a tumbler lock, and the tumbler lock X has an inner cylinder body 3 formed by combining a plurality of members by an operating force of a compound key Y with respect to an outer cylinder body 2 having a long cylinder shape. Rotate relative to each other.

  In the embodiment, the tumbler lock X is horizontally fixed to the wall portion 1a of the door 1 (for example, a door of a house, a door of a vending machine, etc.), and the lock tip portion 4 constituting the inner cylinder body 3 is covered with a cosmetic cover. 5 is fitted outside.

  As shown in FIG. 1, the lock tip portion 4 having the key hole (key hole) 6 and the decorative cover 5 project from the outer wall surface of the wall portion 1a. Further, the lock rear end portion 7 forming the inner cylinder body 3 has a tail piece (output piece) 8 located on the axis 0 of the outer cylinder body 2 or the inner cylinder body 3. Note that the symbol A indicates the insertion direction of the duplicate key Y.

  Next, FIG. 2 is a schematic vertical sectional view of the tumbler lock X shown in FIG. 1 taken along a plane including the central axis 0. On the other hand, FIG. 3 is a schematic vertical sectional view taken along a plane orthogonal to the insertion direction A of the duplicate key Y. The basic components of the tumbler lock X will be described with reference to FIGS. 2 and 3.

  First, the tumbler lock X of the present invention has two movable left and right movable obstacles Z which are arranged in two rows at predetermined intervals in the central axis direction of the inner cylinder. The key Y of the disc tumbler lock is substantially the same in cross section in the key width direction as that of the inclined guided portions provided on the respective facing surfaces forming the plate insertion holes of the two-divided movable obstacle Z. The feature is that it is a guide hack for Yamagata tumblers.

  As mentioned above, 2 is an elongated cylindrical outer cylinder, and the lock cam groove 11 is formed on the inner peripheral surface 2a of the outer cylinder along the generatrix of the outer cylinder 2 (see FIG. 2). ). The pair of lock cam grooves 11 are formed symmetrically along the generatrix of the outer cylindrical body and vertically or horizontally centered on the central axis 0 of the outer cylindrical body 2 or the inner cylindrical body 3.

  As shown in FIG. 3, the left and right locking bars 12 have an outer tip portion 12a that engages and disengages with each lock cam groove 11 of the outer tubular body 2, and an inner engagement portion that is formed continuously with the tip portion 12a. It is composed of a plywood portion 12b, and is appropriately incorporated in an unlocking notch 13 formed in the outer peripheral end of the inner cylinder 3 in the longitudinal direction of the inner cylinder. Then, as shown in FIG. 2, for example, the biasing spring 14 on the front side provided on the lock tip 4 side (rear side) of the inner tubular body 3 and the lock rear end 7 side (front) are provided. By the biasing spring 14 on the rear side, each locking bar 12 is constantly biased outward in the radial direction of the inner cylinder 3. Therefore, in the locking bar 12, in the normal state, the outer tip portions 12a are engaged with the lock cam grooves 11, 11 of the outer tubular body 2 by the plurality of biasing springs 14, 14, respectively.

  Next, the inner cylindrical body 3 has a lock tip portion 4 having a key hole 6 in the center, a lock rear end portion 7 having a tail piece 8 as an output projection piece in the center portion, the lock rear end portion 7 and A plurality of tumbler accommodating parts 27 and a plurality of tumbler spring accommodating parts 28 provided between the lock tip part 4 and partitioned and formed by a plurality of partition plates (or partition parts) 16 orthogonal to the axial direction. No. 2 partition plate slot, a pair of plate-shaped guide portions 10 for movable obstacles, an unlocking notch 13 in the axial direction, and the like. And an inner cylinder body 15 formed in a long tubular shape via the inner cylinder body, and the inner cylinder body is arranged side by side along the central axis direction in a row, and is orthogonal to the axial direction, and the tumbler accommodating portion 27 and the tumbler are provided. A plurality of circular or track-shaped partition plates 16 forming the spring accommodating portion 28 and the lock tip portion 4 penetrating through the connecting holes 18 of the partition plate 16 inserted from the one end opening 27a of the inner cylinder body 15. It is composed of a pair of connecting rods 19 of a predetermined length, which are installed on the rear end portion 7 of the lock. The specific configuration of the inner tubular body 3 is not a specific requirement of the present invention, and will be omitted.

  In FIG. 2, reference numeral 26 is a ring-shaped defense plate, which is appropriately tempered, and has an unnumbered central hole which coincides with the key hole 6 in its central portion and its central portion. The above-mentioned unnumbered insertion hole for the guide rod and the like are appropriately formed in the nearer portion.

Here, FIG. 3 showing the initial position will be described. With reference to FIG. 3, the inner cylinder main body 15 is wide at one end on the opening side of the upper outer circumference, except for the left and right step-like substance portions 15a, 15a shown by hatching, while the inner circumference of the lower outer circumference is open or non-open. The other end portion of which is narrow, and is based on the upper and lower plate-shaped guide portions 10 for movable obstacles located on the vertical line V passing through the central axis O of the inner tubular body 3 (inner tubular body 15). Then, it has a pair of left and right tumbler accommodating portions 27, 27.
A pair of left and right movable obstacles Z are appropriately incorporated into the tumbler accommodating portions 27 from the opening 27a at one end thereof. As shown in FIG. 2, the seven movable obstacles Z (the divided movable obstacles Z are 14 in total) are arranged in rows in the direction of the central axis O through a plurality of track-shaped or circular partition plates 16. It is installed in.

  Reference numeral 13 denotes a pair of unlocking notches symmetrically formed in the upper and lower portions of the inner cylinder body 15 or in the left and right portions thereof, and these unlocking notches 13 are the central portions of the above-mentioned upper and lower body portions 15a, 15a. Is formed inward in the radial direction, and fits and guides the tip portions 12a of the pair of locking bars 12. Reference numeral 28 denotes a pair of left and right tumbler spring accommodating portions having spring end supporting surfaces formed at appropriate places (in FIG. 3, right and left substantial portions 15a, stepped lower end portions of the left and right body portions 15a) in the tumbler accommodating portion 27. The spring accommodating portions 28 are provided in a pair in the vertical direction or the horizontal direction so as to face the insides of the left and right step-like substance portions 15a, 15a.

  Next, referring to FIG. 2, the structure on the lock rear end 7 side will be described. As described above, the lock rear end portion 7 has the tail piece 8, and the tail piece 8 has the stopper 31 such as the washer ring 31a and the stopper ring 31b provided at the rear end portion of the outer tubular body 2. It is attached to the central portion of a tail plug 32 that is rotatably fitted in the rear end portion of the outer tubular body 2 via the intermediary portion.

  The tail plug 32 that constitutes the lock rear end portion 7 has a pair of rear support holes 33 that support the rear end portion of the connecting rod 19 similarly to the lock front end portion 4. The connecting rod 19 has its front end in the front support hole 25 and its rear end in the rear support hole 33 in a state of penetrating a movable obstacle Z and a partition plate 16 which are incorporated in the inner cylinder body 15 and will be described later. It is supported.

  Next, with reference to FIG. 4, the structure of the two-divided movable obstacle Z will be described. Since the configuration of the other movable obstacle Z in the upper part of the drawing is the same as that in one of the lower part in the drawing, the same reference numerals are given and duplicate description is omitted. FIG. 4 is a front view (or a rear view) of the movable obstacle Z placed sideways.

  With reference to FIG. 4, the right end portion (here, “one end portion 41a”) formed in a large arc shape on the right side is formed corresponding to the curvature of the inner peripheral surface 2a of the outer tubular body 2. Therefore, in the state in which the tumbler spring 42 is biased (locked state), for example, it comes into pressure contact with the inner peripheral surface 2a of the outer tubular body 2. The left end of the protrusion having a small arcuate end face on the left side (herein, referred to as "the other end 41b of the protrusion") is located in the storage portion 30 between the tumbler spring storage portion 27 and the lower plate-shaped guide portion 10. To do. The other inclined guided portion b is formed on the inner end portion side (upper end portion in the drawing) 41c of the protruding other end portion 41b. Although not shown in FIG. 4, one inclined guided portion a is formed on the back side (back surface) of the other guided portion b. A receiving recess 48 for the engaging plate portion 12b of one or more locking bars 12 is formed at the outer end portion (lower end portion in the drawing) 41d with respect to the inner end portion side (upper end portion in the drawing) 41c. There is. The laterally-inclined recess at the left end is a spring support end 49 that supports the end for the tumbler spring 42. Further, 46 is a through hole for the connecting rod 19, and the through hole 46 for the connecting rod 19 has a rectangular long hole because the movable obstacle Z slides to the left side in the drawing against the spring force of the tumbler spring 42. Is formed in.

  Next, returning to FIGS. 5 to 9, a supplementary description will be given of the configuration of the duplicate key Y of the present invention. In these figures, Y is a duplicate key, B is a blade (insertion portion), 71 is a flat surface portion, 71a is an upper surface on one side of the flat surface portion, 71b is a lower surface on one side of the flat surface portion, 72 is a side surface portion, and 72a is one side. , 72b is the other side surface.

  The key Y as the duplication key of this embodiment is fitted to the outer cylindrical body 2 having the lock cam groove 11 along the generatrix on the inner peripheral surface and the outer cylindrical body so as to be rotatable, and along the central axis O. An inner cylinder 3 having a formed key hole 6 and an unlocking notch 13 in the radial direction, and a locking member extending along a generatrix of the inner cylinder and biased in a direction to engage with the lock cam groove 11. It is located between the bar 12 and each partition 16 of the inner cylinder 3, is slidable in the radial direction against the spring force of the tumbler spring 42, and is formed on the blade B of the duplicate key Y. A key for a cylinder lock having a plurality of movable obstacles Z having guided portions that engage with the tumbler guiding notches 73, and the movable obstacle Z is divided into two opposite states. , The guided portion (a, b) formed in an inclined shape on a part of each of the facing surfaces on the inner end side thereof, while the guide knurling guide notch 73 of Y of the key is the blade. A first recess 73a formed in the blade width direction (key width direction) from the side surface portion 72 on the upper surface 71a on one side of the flat portion 71 of B, and the flat surface corresponding to the substantially rear side position of the first depression 73a. When the blade B of the compound key Y is inserted into the key hole 6, the movable obstruction Z is divided into two parts, which are the recessed second notches 73b formed on the one side lower surface 71b of the portion 71. While being guided by the pair of connecting rods 19 in the same direction against the spring force of 42, the guided portions a and b of the movable obstruction Z engage with the guide knurls 73 of the keypad. Accordingly, the unlocking receiving recesses 48 on the outer end side of the movable obstruction Z divided into two parts coincide with the engaging plate portion 12b on the inner end part side of the locking bar 12, and thus the duplicate key Y At the same time, when the inner cylinder body 3 is rotated in the unlocking direction, the inner cylinder body 3 is relatively rotated with respect to the outer cylinder body 2 by a wedge action generated between the lock cam groove 11 and the locking bar 12. (See FIGS. 13 and 14).

  FIG. 7 is an explanatory view showing the cross-sectional shape of the tumbler guide notch 73 at the line 7-7 in FIG. 5, and the fact that the length of the oblique side on the front side and the length of the oblique side on the back side are different (characteristic portion). . As shown in FIG. 5, for example, the tumbler guide notch 73 has large and small guide notches having different depths in the blade inserting direction on both side surfaces 72a and 72b which are the side surfaces 72 of the blade (insertion portion) B. When the duplicate key Y is turned upside down in the state of FIG. 5, both side surfaces 72a and 72b, which are the side surface portions 72, have different depths in the insertion direction of the blade B. 73 are formed respectively.

  Therefore, as shown in FIG. 7, the cross section shape of the tumbler guide notch 73 is substantially mountain-shaped, and the ridge line portions (portions visible at the cutting edge) P, P of the upper and lower mountain-shaped guide notches 73 are the same as those of the inner cylindrical body 2. It deviates from the vertical line V passing through the central axis O in a rotationally symmetrical state. Therefore, the length L2 of the hypotenuse of the second notch 73b of the tumbler guide notch 73 is shorter than the length L1 of the hypotenuse of the first notch 73a.

  By the way, the large and small guide dents 73 having different depths are formed on the front side and the back side in the insertion direction of the blade B in total of about 5 to 7 in correspondence with the arrangement position of the movable obstacle Z, but of course large and small. It is preferable that the number of the tumbler guide notches 73 corresponds to that of the movable obstacle Z. A long groove 74 is linearly formed along the blade insertion direction in a rotationally symmetrical manner at the central portion of the Y-blade B of the duplicate key in plan view.

  The lock to which the keys Y and Y1 of the present invention can be applied is of a type in which a tumbler moves linearly, for example, Japanese Patent Laid-Open No. 62-194374, Japanese Utility Model Publication No. 6-28616, and Japanese Patent Laid-Open No. 2000-96888. The invention is applicable not only to the publications, but also to those using the pendulum-type principle (lever-type tumbler lock) described in, for example, Japanese Utility Model Laid-Open No. 55-128848 and Japanese Unexamined Patent Publication No. 9-144398.

    INDUSTRIAL APPLICABILITY The present invention can be used in the fields of locks and fittings.

X... tumbler lock,
Z: Movable obstacle with two splits,
a, b... Guided part,
Y, Y1... a duplicate key,
B...Blade,
P1 to P5... Interval (pitch),
P... Position of vertex of cross-sectional shape,
71... Plane part,
72... Side portion,
73... Induction notch for tumbler,
73a... 1st step,
L1... the length of the hypotenuse of the first step,
73b...increment 2
L2... The length of the hypotenuse of the second step,
74... Linear long groove,
1...door,
2... Outer cylinder,
3... inner cylinder,
11...Lock cam groove,
12... Rocking bar.

Claims (5)

In a key for a cylinder lock in which a notch-shaped tumbler guide notch is formed on the side surface of the blade, the notch-shaped tumbler guide notch is formed in the blade width direction on the one side upper surface of the flat surface portion of the blade. The first dents are the first dents and the second dents are formed on the lower surface of one side of the flat surface of the blade, which corresponds to a position substantially behind the first dents. A key for a cylinder lock in which the cross-sectional shape of the edge in the blade width direction that passes through the center portion of the second step and the second step is a substantially mountain shape with an inclined ridge portion. The key for a cylinder lock according to claim 1, wherein the length of the oblique side of the second step of the guide hack for the tumbler is different from the length of the oblique side of the first step. The cylinder lock key according to claim 1, wherein the length of the hypotenuse of the second notch of the guide notch for the tumbler is substantially the same as the length of the hypotenuse of the first notch. .. 2. The cylinder lock key according to claim 1, wherein the tumbler guide notch has a length of the hypotenuse of the second step different from the length of the hypotenuse of the first notch, and a length of the hypotenuse of the second notch. The key for a cylinder lock is characterized in that there are two types having a length substantially equal to the length of the hypotenuse of the first step, with a space at the edge of the side surface of the blade. In any one of the keys for a cylinder lock of Claim 1 thru|or 4, the tumbler induction notch is a group of one formed on the edge of one side surface part, and the other side edge part. There is also a group of formed ones, and those in which the positions of the vertices of the cross-sectional shape of the guide hacks for the tumblers adjacent to each other of the group are different are included, and the key can be used by rotating it by 180 degrees. Key for cylinder lock, which is reversible.