Guide jig, key machine, and method for manufacturing duplicate keys

Abstract

To provide a guide jig, a key machine, and a duplicate key manufacturing method which are capable of manufacturing a duplicate key of an original key having a truncated pyramid-shaped hole.SOLUTION: A guide jig 70 of an embodiment includes a mask surface 71 which is to be held by a key machine and covers a surface of an original key in which a truncated pyramid-shaped hole is formed, and a guide hole 72 which is formed in the mask surface 71, through which a tip surface of a cutter guide can pass, and which extends along a diagonal line of an opening of the hole.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present invention relates to a guide jig, a key machine, and a duplicate key manufacturing method. Background Art

[0002] For a key of a dimple cylinder lock that is relatively resistant to picking, holes serving as depressions with different depths and sizes are formed in the body of the key that is inserted into a keyhole. When the body is inserted into the keyhole, a plurality of tumblers are moved by the holes to positions that allow rotation of an inner cylinder, so that unlocking can be performed by turning the key. In other words, the shape of the holes determines whether the key is a correct key that can unlock the dimple cylinder lock. Prior Art Documents Patent Documents

[0003] Patent Document 1 Japanese Patent No. 4156001 Summary of the Invention Problem to be Solved by the Invention

[0004] Among such keys, to further enhance security, there has been provided a key in which a truncated pyramidal hole is formed on a side surface of the body of the key. However, it is difficult to manufacture a duplicate key that has a truncated pyramidal hole. That is, in a conventional key machine, a disk-shaped cutter forms a groove on a side surface of a blank key so as to penetrate through the upper and lower surfaces, and thus it is impossible to form a truncated pyramidal hole. Further, when a hole is formed by a drill-shaped cutter, only a circular hole can be formed. Furthermore, even when an attempt is made to form the hole by tracing the truncated pyramidal shape of an original key using an existing cutter guide, it is extremely difficult to form a truncated pyramidal shape identical to that of the hole, which causes a problem in the function as a duplicate key.

[0005] This invention was proposed to solve the above-mentioned problems, and its purpose is to manufacture a duplicate key for an original key having a truncated pyramidal hole. [Means for solving the problem]

[0006] To achieve the above objectives, the guide jig of the present invention has a mask surface that is held in a key machine and covers the surface of an original key having a truncated pyramidal hole formed therein, and a guide hole formed in the mask surface that allows the tip surface of a cutter guide to pass through and is aligned with the diagonal of the opening of the hole.

[0007] The key machine of the present invention comprises: a cutter that grinds the surface of a blank key by rotation in contact with the surface of the blank key; a first holding part for holding the blank key; a second holding part for holding an original key having a truncated pyramidal hole formed on its surface; a cutter guide whose tip surface is sized to fit into the bottom surface of the hole, and whose tip surface moves toward and away from the bottom surface of the hole; a guide jig; a moving mechanism that moves the cutter and the cutter guide synchronously in a direction in which the tip surface of the cutter guide is in contact with the hole and the cutter is in contact with the blank key; and a support mechanism that fixes the relative positions of the first and second holding parts, and supports the first and second holding parts so as to be able to move synchronously in a direction along the diagonal, so that the cutter grinds the round hole formed on the surface of the blank key in a direction along the diagonal of the opening of the hole, with the tip surface of the cutter guide inserted through the guide hole of the guide jig and in contact with the bottom surface of the hole.

[0008] The present invention provides a method for manufacturing duplicate keys, which involves holding a blank key with a first holding part, holding an original key with a truncated pyramidal hole formed on its surface with a second holding part, and moving a cutter that grinds the surface of the blank key by rotation by contacting the surface of the blank key via a moving mechanism, and a first cutter guide whose tip surface fits into the bottom surface of the hole and moves toward and toward the hole in the original key, respectively, in synchronous movements in the direction toward contact with the blank key and the first cutter guide, thereby forming a round hole on the surface of the blank key corresponding to the hole, and the guide The mask surface of the jig covers the surface of the original key in which the round hole is formed, and the moving mechanism causes the tip surface of the second cutter guide, which is sized to fit into the bottom surface of the hole and can be inserted into the guide hole of the guide jig, to be inserted into the guide hole and in contact with the hole of the original key, and the support mechanism causes the second cutter guide to move relative to the guide hole, and the first and second holding parts move synchronously while their relative positions are fixed so that the cutter grinds the round hole in a direction along the diagonal of the opening of the hole. [Effects of the Invention]

[0009] According to the present invention as described above, it is possible to manufacture a duplicate key for an original key having a truncated pyramidal hole. [Brief explanation of the drawing]

[0010] [Figure 1] Front view (A) showing the key machine in the embodiment during the formation of a round hole, and front view (B) showing the key machine in the form of a groove. [Figure 2] Left side view (A) showing the formation of a round hole in the key machine of the embodiment, and left side view (B) showing the formation of a groove. [Figure 3] Right side view showing the key machine of the embodiment [Figure 4] Diagram illustrating the procedure for forming duplicated holes. [Figure 5] Front view (A) showing the positioning of the second cutter guide, top view (B) showing the guide hole and the second cutter guide, and top view (C) showing the cutter and the circular hole. [Figure 6] Front view (A) showing groove formation by the second cutter guide, top view (B) showing guide hole and second cutter guide, top view (C) showing cutter and groove. [Figure 7] Side view (A), enlarged view (B) of a blank key with a circular hole formed; side view (C), enlarged view (D), and top view (E) of a blank key with a duplicated hole formed. [Figure 8] Side view (A) and top view (B) showing a blank key. [Figure 9] Side view (A), top view (B), and enlarged view of the hole (C), (D) showing the original key. [Figure 10] Plan view (A) showing the size of the tip surface and hole of the first cutter guide, and cross-sectional view (B) showing the shape of the tip surface and hole of the first cutter guide. [Figure 11] Plan view (A) showing the size of the tip surface and hole of the second cutter guide, and cross-sectional view (B) showing the shape of the tip surface and hole of the second cutter guide. [Figure 12] Plan view (A), (C), front view (B), (D) showing the guide jig of the embodiment. [Modes for carrying out the invention]

[0011] Embodiments for carrying out the present invention (hereinafter referred to as "this embodiment") will be described with reference to the drawings. Note that the shapes and sizes of the components shown in each drawing are for the purpose of facilitating understanding of the invention and do not necessarily correspond to the actual product.

[0012] [overview] In the key machine 1 and duplicate key manufacturing method of the present embodiment, as shown in the front view of Fig. 1(A), the left side view of Fig. 2(A), the right side view of Fig. 3, and Fig. 4(A) and (B), the first cutter guide 40 is brought into contact with the truncated pyramid-shaped hole H of the original key K2 held by the second holding portion 30. Accordingly, as shown in Fig. 5(C), Fig. 7(A) and (B), the round hole CH corresponding to the hole H of the original key K2 is ground by the cutter 10 on the blank key K1 held by the first holding portion 20.

[0013] Then, as shown in the front view of Fig. 1(B), the left side view of Fig. 2(B), Fig. 4(C), (D), and Fig. 5(A), (B), the second cutter guide 41 is inserted into the guide hole 72 of the guide jig 70 held together with the original key K2 by the second holding portion 30. Then, as shown in Fig. 6(A) and (B), the first holding portion 20 and the second holding portion 30 are moved along the guide hole 72 (along the diagonal line DX of the opening A of the hole H (see Fig. 9(D))), and as shown in Fig. 7(C) and (D), the groove G corresponding to the diagonal line DX is ground. Accordingly, the replicated hole TH corresponding to the hole H of the original key K2 is formed on the side surface S1 of the blank key K1.

[0014] That is, the duplicate key manufacturing method of the present embodiment is performed in two steps: forming the round hole CH corresponding to the hole H, and forming the groove G corresponding to the diagonal line DX of the opening A of the hole H. The key machine 1 is a duplicate key manufacturing apparatus that manufactures duplicate keys in such two steps.

[0015] [Blank key] As shown in the side view of Fig. 8(A) and the top view of Fig. 8(B), the blank key K1 has a substantially rectangular plate-shaped body portion M1 in plan view, and no hole is formed on the side surface S1 of this body portion M1.

[0016] [Original key] As shown in the side view of FIG. 9(A) and the plan view of FIG. 9(B), the original key K2 has a substantially rectangular plate-shaped body M2 in plan view, and truncated pyramid-shaped holes H1 and H2 are formed in the side surface S2 of the body M2. In the following description, when holes H1 and H2 are not distinguished from each other, they are referred to as hole H. On the side surface S2, as indicated by * in the drawing, 11 formation positions for holes H are set along the longitudinal direction. In the present embodiment, for convenience, an example in which two holes H are formed at adjacent 5th and 6th positions is shown, but in practice, any of the 11 positions may be freely selected for forming the hole H. In addition, two sizes are set for the hole H: a hole H1 having a size close to the width of the side surface S2, and a smaller hole H2. The depths of the hole H1 and the hole H2 are different, and the hole H1 is deeper. Note that the original key K2 may be a key manufactured as a duplicate key having the same hole H as the original key to be duplicated.

[0017] As shown in the enlarged view of FIG. 9(C), the hole H is in the shape of a truncated quadrangular pyramid, and the opening A at the upper edge and the bottom surface B are quadrangular (including square and rectangle). However, as shown in the enlarged view of FIG. 9(D), the opening A and the bottom surface B do not necessarily need to be an accurate quadrangle, and may have a shape with rounded corners, or a shape approximate to a circle, an ellipse, or an oval. In addition, the bottom surface B may be a concave curved surface.

[0018] The four inclined inner side surfaces C of the hole H are trapezoidal. The boundary between each inner side surface C is along the diagonal line DX of the opening A in plan view. However, the boundary between each inner side surface C does not necessarily need to form a distinct corner, and may be rounded or a continuous curved surface. Therefore, this boundary is a region including the diagonal line DX. In addition, each inner side surface C may be a curved surface. Furthermore, the boundary between the side surface S2 and the hole H, and the boundary between the bottom surface B and each inner side surface C do not necessarily need to form a distinct corner, and may be rounded or a continuous curved surface.

[0019] [Configuration] As shown in Figures 1 to 3, the key machine 1 of this embodiment includes a cutter 10 provided on the main body 1a, a first holding part 20, a second holding part 30, a first cutter guide 40, a second cutter guide 41, a moving mechanism 50, a support mechanism 60, and a guide jig 70.

[0020] (cutter) The cutter 10 grinds the side surface S1 of the blank key K1 by rotating in contact with it. The cutter 10 is cylindrical in shape, and the grinding chips produced by the grinding blade at its tip are discharged through a helical groove formed on its outer circumference. The cutter 10 is detachably attached to the motor 11, which is the drive source, via a chuck mechanism 11a, and rotates in the motor 11 to grind the blank key K1. The axis of the cutter 10 is perpendicular to the side surface S1 of the blank key K1 (Z direction, vertical direction).

[0021] (First holding part) The first holding part 20 holds the blank key K1. The first holding part 20 holds the blank key K1 so that its side surface S1 faces the cutter 10 and the plane of the body surface M1 is vertical, by clamping the body surface M1 from both sides with the vise 21 and tightening and fixing it with the screw 22. As a result, the side surface S1 is horizontal. The part of the screw 22 head that is exposed to the outside has a widened grip so that it can be easily grasped and rotated by the operator.

[0022] (Second retaining part) The second retaining part 30 holds the original key K2. The second retaining part 30 is held by clamping it from both sides with the vise 31 and tightening it with the screw 32, so that the side surface S2 of the original key K2 faces the first cutter guide 40 and the second cutter guide 41, which will be described later, and the plane of the body M1 is vertical. As a result, the side surface S2 becomes horizontal. In addition, the blank key K1 and the original key K2 are at the same height.

[0023] Furthermore, the position of the blank key K1 relative to the cutter 10, and the position of the original key K2 relative to the first cutter guide 40 and the second cutter guide 41 are positioned by a jig (not shown) so that they coincide relatively. In addition, the positioning is done so that the centers of the tip surfaces 41a of the first cutter guide 40 and the second cutter guide 41 align with the center of the hole H formation position (see Figures 10(A) and 11(A)), and the center of the tip of the cutter 10 aligns with the center of the duplicated hole TH formation position of the blank key K1.

[0024] Furthermore, the height positions of the tip surfaces 40a and 41a of the first cutter guide 40 and the second cutter guide 41 are set such that when the cutter 10 is in contact with the hole H, the tip of the cutter 10 contacts the side surface S1 of the blank key K1, and when it exits the hole H and contacts the side surface S2 of the original key K2, the tip of the cutter 10 does not contact the side surface S1 of the blank key K1. The portion of the screw head that is exposed to the outside is a knob with an enlarged diameter to make it easier to grip and rotate.

[0025] (First cutter guide) The first cutter guide 40 is a rod-shaped member fixed in the vertical direction, with its tip surface 40a facing the side surface S2 of the original key K2 held by the second holding part 30. The first cutter guide 40 is detachably attached to the chuck mechanism 42 provided on the main body 1a. The first cutter guide 40 in this embodiment is a cylindrical rod-shaped member with a frustoconical tip that is sharpened.

[0026] As shown in Figure 10(A), the tip surface 40a of the first cutter guide 40 is sized to fit within the bottom surface B of the hole H. More specifically, the diameter d1 of the tip surface 40a is smaller than both the horizontal length W and the vertical length T of the bottom surface B. Also, as shown in Figure 10(B), the angle α between the tip surface 40a and the side surface 40b is larger than the angle β between the bottom surface B and the inner surface C of the hole H. With these size and angle settings, the tip surface 40a can reach and contact the bottom surface B of the hole H while the height positions of the center of the bottom surface B and the center of the tip surface 40a are aligned. Note that the boundary between the tip surface 40a and the side surface 40b of the first cutter guide 40 does not necessarily have to be a sharp corner, but may be rounded.

[0027] (Second cutter guide) The second cutter guide 41 is a vertical rod-shaped member and has a tip surface 41a that is inserted into a guide hole 72 of a guide jig 70, which will be described later. The second cutter guide 41 is detachably attached to the chuck mechanism 42 in place of the first cutter guide 40. The tip surface 41a of the second cutter guide 41 faces the side surface S2 of the original key K2 held by the second holding part 30. As shown in Figures 11(A) and (B), the tip surface 41a of the second cutter guide 41 has a frustoconical shape that moves toward and away from the hole H1. The tip surface 41a is provided at the lower end of the cylindrical rod-shaped (pin-shaped) tip portion 41b.

[0028] The tip portion 41b of the second cutter guide 41 has a diameter that fits into the bottom surface B of the hole H and is inserted into the guide hole 72 of the guide jig 70. More specifically, the diameter d2 of the tip surface 40a is smaller than the width of the straight portion of the guide hole 72, and is smaller than both the lateral length W and the vertical length T of the bottom surface B. Also, the axial length L of the tip portion 41b is longer than the combined length ha of the depth of the hole H and the thickness of the mask surface 71 of the guide jig 70.

[0029] (moving mechanism) As shown in Figures 1 to 3, the moving mechanism 50 is a mechanism that moves the cutter 10, the first cutter guide 40, or the second cutter guide 41 in a synchronous manner in the direction in which the cutter 10 moves toward and toward the blank key K1, and the first cutter guide 40 or the second cutter guide 41 moves toward and toward the side surface S2 of the original key K2. As shown in Figure 3, the moving mechanism 50 has a support body 51, an operating part 52, and a transmission part 53. The support body 51 supports the cutter 10, the first cutter guide 40, and the second cutter guide 41, and is provided on the upper part of the main body 1a so as to be able to move up and down. At the lower part of the support body 51, the motor 11 and the chuck mechanism 11a are fixed to the left when viewed from the front, and the chuck mechanism 42 into which the first cutter guide 40 or the second cutter guide 41 is attached and detached is fixed to the right. The cutter 10, the first cutter guide 40, or the second cutter guide 41 are mounted vertically on the chuck mechanism 11a or chuck mechanism 42, with their respective tips facing the side S1 of the blank key K1 and the side S2 of the original key K2, which are positioned as described above.

[0030] The operating section 52 is a component that operates the support 51 to move up and down. The operating section 52 is a rod-shaped component with a gripping section that widens in diameter towards the top. The transmission section 53 is a mechanism that converts a rotational operation of the operating section 52, with the lower end as the pivot point, into a vertical movement of the support 51. The transmission section 53 has a shaft 53a, a rotating gear 53b, and a rack gear 53c. The shaft 53a is a component that is rotatably mounted on the side surface of the main body 1a with a horizontal X-direction as its axis. The shaft 53a is connected to the lower end of the operating section 52 in a direction perpendicular to it. The rotating gear 53b is a disc gear built into the main body 1a and rotatably mounted around the shaft 53a. The rack gear 53c is a gear that is fixed to the support 51 and extends vertically, and is driven vertically in accordance with the rotation of the rotating gear 53b.

[0031] As a result, when the operating unit 52 is tilted forward, the cutter 10 and the first cutter guide 40 or the second cutter guide 41 descend together with the support 51, and when the operating unit 52 is tilted backward, the support 51, the cutter 10, and the first cutter guide 40 or the second cutter guide 41 rise.

[0032] (Support mechanism) As shown in Figures 1 to 3, the support mechanism 60 supports the first holding part 20 and the second holding part 30 so that they can move in a direction along the diagonal DX of the opening A of the hole H, while fixing the relative positions of the first holding part 20 and the second holding part 30. Furthermore, the support mechanism 60 allows the first holding part 20 and the second holding part 30 to move synchronously so that when the tip surface 40a of the first cutter guide 40 or the tip surface 41a of the second cutter guide 41 contacts the hole H of the original key K2, the cutter 10 contacts and grinds the side surface S1 of the blank key K1.

[0033] More specifically, the support mechanism 60 includes a stage 61, a sliding mechanism 62, and an operating section 63, as shown in Figures 2 and 3. The stage 61 is a plate-shaped body with a first holding section 20 and a second holding section 30 fixed to its upper part. The sliding mechanism 62 is a mechanism on which the stage 61 is mounted and which supports the movement of the stage 61 along two orthogonal horizontal axes.

[0034] The slide mechanism 62 includes a guide section 62a, a table 62b, and a frame 62c. The guide section 62a is a two-axis slide guide that moves in a horizontal lateral direction (X direction in the figure) and a horizontal front-to-back direction perpendicular to it (Y direction in the figure). The table 62b is mounted on the guide section 62a and moves in the X and Y directions. By combining this movement in the X and Y directions, the table 62b and the stage 61 can move diagonally in a direction horizontal to the X and Y directions. The frame 62c surrounds the table 62b and is a member that can move together with the table 62b. The frame 62c is provided with an extension section 62d that protrudes from its side, and a spherical bearing 62e is provided in the extension section 62d, through which the lower end of the operating section 63 (described later) passes and is supported.

[0035] The operating section 63 is a component that operates to move the first holding section 20 and the second holding section 30 in a synchronized manner. The operating section 63 is a rod-shaped member with a gripping section that widens in diameter towards the top. The lower end of the operating section 63 is inserted through the spherical bearing 62e of the expansion section 62d and is pivotably connected to the lower part of the side surface of the main body 1a.

[0036] Therefore, when the operating unit 63 is moved forward, backward, left, or right, the stage 61 mounted on the table 62b moves in the X and Y directions along with the frame 62c. As a result, the first holding unit 20 and the second holding unit 30 move in the X and Y directions. Furthermore, by combining this with the movement of the guide unit 62a in the X and Y directions, the first holding unit 20 and the second holding unit 30 can be moved in directions inclined with respect to the X and Y directions.

[0037] (Guide jig) The guide jig 70 is a jig that enables cutting corresponding to the diagonal DX of the opening A of hole H. As shown in Figure 12, the guide jig 70 has a mask surface 71, a guide hole 72, a support surface 73, and a spacer 74. The mask surface 71 is a surface that covers the side surface S2 of the original key K2. The mask surface 71 is a horizontal rectangular plate that extends along the longitudinal direction of the side surface S2 of the original key K2. The guide hole 72 is formed in the mask surface 71 and is a hole through which the tip 41b of the second cutter guide 41 can pass, and is aligned with the diagonal DX of the opening A. In other words, the guide hole 72 is an X-shaped through hole.

[0038] The support surface 73 is a plate extending from one side of the mask surface 71 in a direction perpendicular to the mask surface 71, and is supported and fixed by being sandwiched between the plane of the original key K2 and the second holding part 30. The guide jig 70 is held in the second holding part 30 so that the center of the guide hole 72 (the intersection of the X) coincides with the center of the hole H of the original key K2. Preferably, the length of the guide hole 72 is set so that the center of the second cutter guide 41 reaches the corner of the opening A, by an amount equal to or greater than the radius of the tip surface 41a of the second cutter guide 41 than the diagonal DX of the opening A of the large hole H1. In other words, the guide hole 72 should be of a size corresponding to the large hole H1.

[0039] Multiple guide holes 72 are provided along the longitudinal direction of the original key K2. Each guide hole 72 corresponds to the formation position of the multiple holes H shown in Figure 9(A). The formation position of hole H is the position where hole H is set to be formed, regardless of whether hole H is actually formed or not. However, the guide holes 72 are provided to correspond to every other hole H formation position. In other words, if we were to try to form guide holes 72 corresponding to adjacent holes H, the guide holes 72 would connect, so they are formed every other hole H formation position. Also, the multiple guide holes 72 are the same size.

[0040] In this embodiment, two guide jigs 70A and 70B are used. As shown in Figures 12(A) and (B), guide jig 70A has six guide holes 72 formed corresponding to odd-numbered formation positions 1, 3, 5, 7, 9, and 11. As shown in Figures 12(C) and (D), guide jig 70B has five guide holes 72 formed corresponding to even-numbered formation positions 2, 4, 6, 8, and 10. In this embodiment, when guide jigs 70A and 70B are not distinguished, they will be described as guide jig 70.

[0041] The spacer 74 is a plate-like body fixed to the inner surface of the support surface 73. The spacer 74 has a thickness that allows the center of the guide hole 72 to be positioned at the center of the side surface S2 of the original key K2 when the support surface 73 is held by the original key K2 and the second holding part 30. The support surface 73 needs to be at a distance from the guide hole 72 so as not to interfere with the machining of the guide hole 72 formed in the mask surface 71, but when held by the second holding part 30, the center of the guide hole 72 needs to be positioned as described above, so the spacer 74 needs to be inserted.

[0042] [How to make duplicate keys] A method for manufacturing a duplicate key using the key machine 1 of this embodiment described above will now be explained. In the following explanation, the procedure common to both the formation of the duplicate holes TH1 and TH2 will be described as the duplicate hole TH, and any differences will be described later.

[0043] (Formation of a round hole) First, as shown in Figures 1(A), 2(A), and 4(A), the operator holds the gripping parts of screws 22 and 32 and fastens the blank key K1 to the first retaining part 20 with screw 22, and fastens the original key K2 to the second retaining part 30 with screw 32. As a result, the side S1 of the blank key K1 faces the cutter 10, and the side S2 of the original key K2 with the hole H formed therein faces the first cutter guide 40.

[0044] Then, by tilting the operating unit 52 forward, the cutter 10 and the first cutter guide 40 are lowered, and by moving the operating unit 63, the center of the first cutter guide 40 is aligned with the center of the hole H of the original key K2. As a result, the center of the cutter 10 aligns with the center of the position where the duplicated hole TH of the blank key K1 should be formed.

[0045] Furthermore, the cutter 10 is started to rotate, but the blank key K1 is not in contact with the cutter 10, so no cutting occurs. From this state, the operator tilts the operating unit 52 further forward, causing the cutter 10 and the first cutter guide 40 to descend, as shown in Figure 4(B). As a result, the first cutter guide 40 descends until it contacts the bottom surface B of the hole H, and the tip of the rotating cutter 10 contacts the side surface S1 of the blank key K1, causing cutting. This cutting creates a frustoconical round hole CH with the same depth as the vertical cross-section of the hole H (see Figures 7(A) and (B)).

[0046] (Formation of grooves) Next, as shown in Figures 1(B), 2(B), and 4(C), the first cutter guide 40 is removed and the second cutter guide 41 is attached to the chuck mechanism 42. The original key K2 is then removed from the second holding portion 30 of the second cutter guide 41, and the mask surface 71 covers the side surface S2 of the original key K2. The support surface 73 is then clamped in the vise 31 along with the body portion M1, and the original key K2 and the guide jig 70 are tightened and fixed in place. At this time, the center of the guide hole 72 of the guide jig 70 is aligned with the center of the hole H.

[0047] From this state, the operator tilts the operating unit 52 forward, lowering the cutter 10 and the second cutter guide 41, and by moving the operating unit 63, the center of the second cutter guide 41 is aligned with the center of the guide hole 72 of the guide jig 70 (the center of the hole H of the original key K2). As a result, the center of the cutter 10 aligns with the center of the round hole CH formed in the blank key K1.

[0048] Furthermore, the cutter 10 is started to rotate, but the blank key K1 is not in contact with the cutter 10, so it is not cut. From this state, the operator tilts the operating unit 52 further forward, lowering the cutter 10 and the second cutter guide 41 until they contact the bottom surface B of the hole H, as shown in Figure 4(D), and by operating the operating unit 63, the original key K2 is moved along the X-shape of the guide hole 72 (Figures 6(B), 11(A)). As a result, as shown in Figure 6(C), the blank key K1 also moves in the direction along the guide hole 72, so the cutter 10 contacts the inner surface of the round hole CH formed on the side surface S1 of the blank key K1 and cuts it. This cutting creates a duplicate hole TH with an X-shaped groove G formed from the center of the round hole CH (Figures 7(C), (D)).

[0049] By following the procedure described above, duplicate holes TH1 can be formed at odd-numbered formation positions using the guide jig 70A. If duplicate holes TH are to be formed at further odd-numbered formation positions, the same procedure as above is used with the guide jig 70A. If duplicate holes TH2 are to be formed at even-numbered formation positions, the same procedure as above is used with the guide jig 70B. If duplicate holes TH are to be formed at further even-numbered formation positions, the same procedure as above is used with the guide jig 70B. After that, the blank key K1 is removed from the first retaining part 20, and the original key K2 is removed from the second retaining part 30.

[0050] Furthermore, even if the opening A of the hole H2 in the original key K2 is small, and the tip surface 41a of the second cutter guide 41 goes beyond the corner of opening A and reaches the end of the guide hole 72, the tip surface 41a of the second cutter guide 41 rides up onto the side surface S2, causing the cutter 10 to rise and move away from the side surface S1 of the blank key K1, thus forming a duplicate hole TH2 that matches the size of opening A. For this reason, the guide holes 72 formed in the guide jigs 70A and 70B can all be the same size.

[0051] [Effects and Effects] (1) The guide jig 70 of this embodiment is held by the key machine 1 and has a mask surface 71 that covers the surface of the original key K2 in which a truncated pyramidal hole H is formed, and a guide hole 72 formed in the mask surface 71 through which the tip surface 41a of the second cutter guide 41 (cutter guide) can pass and which is aligned with the diagonal DX of the opening A of the hole H.

[0052] The key machine 1 of this embodiment includes a cutter 10 that grinds the surface of a blank key K1 by rotation when in contact with the surface of the blank key K1, a first holding part 20 that holds the blank key K1, a second holding part 30 that holds an original key K2 having a truncated pyramidal hole H formed on its surface, a second cutter guide 41 (cutter guide) whose tip surface 41a is sized to fit into the bottom surface B of the hole H and whose tip surface 41a moves in and out of contact with the bottom surface B of the hole H, a guide jig 70, and a cutter 10 that slides when the tip surface 41a of the second cutter guide 41 is in contact with the hole H. The device includes a moving mechanism 50 that moves the cutter 10 and the second cutter guide 41 synchronously in a direction toward contact with the key K1, and a support mechanism 60 that fixes the relative positions of the first holding part 20 and the second holding part 30, and supports the first holding part 20 and the second holding part 30 so that they can move synchronously in a direction toward the diagonal DX, with the tip surface 41a of the second cutter guide 41 inserted through the guide hole 72 of the guide jig 70 and in contact with the bottom surface B of the hole H, so that the cutter 10 grinds the round hole CH on the surface of the blank key K1 in a direction toward the diagonal DX.

[0053] The key duplication method of this embodiment involves holding a blank key K1 with a first holding part 20, holding an original key K2 having a truncated pyramidal hole H formed on its surface with a second holding part 30, and moving a cutter 10 that grinds the side surface S1 of the blank key K1 by rotating it in contact with the side surface S1 of the blank key K1 by a moving mechanism 50, and a first cutter guide 40 whose tip surface 40a is sized to fit into the bottom surface B of the hole H1, and whose tip surface 40a moves toward and away from the hole H1 of the original key K2, in a synchronous direction toward contact with the blank key K1 and the first cutter guide 40, respectively, thereby creating a round shape on the surface of the blank key K1 corresponding to the hole H1. The first and second holding parts 20 and 30 are moved synchronously while their relative positions are fixed, so that the cutter 10 grinds the round hole CH in the direction along the diagonal DX. The first and second holding parts 30 are moved synchronously while their relative positions are fixed so that the cutter 10 grinds the round hole CH in the direction along the diagonal DX. The first and second holding parts 30 are moved synchronously while their relative positions are fixed. The first and second holding parts 20 are moved synchronously. The first and second holding parts 30 are moved synchronously30 are moved synchronously. The first and second holding parts 30 are moved synchronously. The first and second holding parts 30 are moved synchronously. The first and second holding parts 30 are moved synchronously. The first and second holding parts 30 are moved synchronously. The first and second holding parts 30 are moved synchronously. The first and second holding parts 30 are moved synchronously. The first and second holding parts 30 are moved synchronously. The first and second holding parts 30 are moved synchronously. The first and second holding parts 30 are moved synchronously. The first and second holding

[0054] In this way, after forming a round hole CH with the same depth as the truncated pyramidal hole H of the original key K2 on the side surface S1 of the blank key K1 using the cutter 10, a groove G along the diagonal DX of the opening A of hole H is formed in the round hole CH, thereby creating a duplicate hole TH with a shape equivalent to hole H.

[0055] Here, the inventors of the present invention have found that if a groove G is formed in a round hole CH of the same depth as hole H1, and the groove G is the same as the diagonal DX of the opening A of hole H, then the dimple cylinder lock can be unlocked and extracted in the same way as the truncated pyramidal hole H. In this embodiment, since such a duplicate hole TH can be formed as described above, a duplicate key of the original key K2 can be manufactured in substance even if the shape does not exactly match that of hole H. Furthermore, since the appearance of hole H and the appearance of the duplicate hole TH are similar, the user will not have any doubts about the functionality of the duplicate key.

[0056] Furthermore, in this embodiment, duplicate keys of the original key K2 having hole H can be easily manufactured by the same operation as a general key machine 1. Therefore, special machinery and skilled technicians are not required, and a quick response is possible even in urgent situations.

[0057] (2) In addition, the guide jig 70 of this embodiment has multiple guide holes 72 provided along the longitudinal direction of the blank key K1. Therefore, multiple duplicate holes TH can be continuously formed at positions corresponding to multiple holes H1.

[0058] (3) Multiple guide holes 72 are provided at the formation positions of multiple holes H, with one hole corresponding to each other. Therefore, even if the spacing between holes H is narrow, by using a pair of guide jigs 70A and 70B, each with a guide hole 72 corresponding to every other hole, duplicate holes TH corresponding to all holes H can be formed.

[0059] (4) Multiple guide holes 72 are the same size. As described above, if the second cutter guide 41 comes out of the hole H, grinding by the cutter 10 does not occur, so even if the guide holes 72 are the same size, they can accommodate holes H of different sizes, and the machining of the guide holes 72 is made easier.

[0060] (5) The key machine 1 has a support surface 73 that is held together with the original key K2, and a spacer 74 that is placed between the support surface 73 and the original key K2. Therefore, the support surface 73 does not get in the way when machining the guide hole 72, and when holding it in the key machine 1, the spacer 74 is inserted to position the guide hole 72 in the hole H of the original key K2.

[0061] [Differentiation] The present invention is not limited to the embodiments described above. (1) The first cutter guide 40 and the second cutter guide 41 may be prism-shaped, and their tips may be truncated pyramidal. However, as in the above embodiment, a cylindrical shape allows the guide hole 72 to move more easily, and a truncated cone shape at the tip makes processing easier and manufacturing easier.

[0062] (2) Only the second cutter guide 41 may be used. That is, the second cutter guide 41 may be used in the same way as the first cutter guide 40 described above to form the round hole CH, and then the groove G may be formed in the same way as above. In this case, the first cutter guide 40 and the second cutter guide 41 become common cutter guides, so the work of replacing the cutter guides is not required. In this case, by holding the guide jig 70 in the second holding part 30 from the beginning of the work, the work of removing the original key K2 for attaching the guide jig 70 is not required.

[0063] (3) In the above embodiment, the first retaining part 20 and the second retaining part 30 were arranged so that the longitudinal direction of the blank key K1 and the original key K2 was the Y direction and they were aligned in the Y direction. However, the blank key K1 and the original key K2 may be arranged so that the longitudinal direction is the X direction and they are aligned in the X direction.

[0064] (4) The first holding part 20 and the second holding part 30 may hold the blank key K1 and the original key K2 with their sides S2 in the vertical direction, and the cutter 10, the first cutter guide 40, and the second cutter guide 41 may move toward and away from the blank key K1 and the original key K2 from the horizontal direction.

[0065] (5) In the above embodiment, the hole H formed in the original key K2 was formed on the side surface S2, but it may be formed on the surface of the original key K2, or it may be formed on the flat surface of the body M2. In this case, the blank key K1 and the original key K2 are held and ground so that the flat surface is in a horizontal direction.

[0066] [Other embodiments] The present invention is not limited to the embodiments described above, and the components can be modified and implemented in practice without departing from the spirit of the invention. Furthermore, various inventions can be formed by appropriately combining the multiple components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiments. Moreover, components from different embodiments may be appropriately combined. [Explanation of Symbols]

[0067] 1 Key Machine 1a Main unit 10 cutters 11 Motor 11a Chuck mechanism 20 First retaining part 21 Vice 22 screws 30 Second retaining part 31 Vice 32 screws 40 First cutter guide 40a Tip surface 40b side 41. Second cutter guide 41a Tip surface 41b Tip 42 Chuck mechanism 50 Moving mechanism 51 Support 52 Operation section 53 Transmission Section 53a Shaft 53b Rotating gear 53c Rack Gear 60 Support mechanism 61 stages 62. Slide mechanism 62a Guide section 62b Table 62c frame 62d Extension 62e Spherical bearing 63 Operation section Guide fixtures for 70, 70A, and 70B models. 71 Mask 72 guide holes 73 Support surface 74 Spacers

Claims

1. A mask surface that covers the surface of the original key, which is held in the key machine and has a truncated pyramidal hole formed therein, A guide hole is formed on the mask surface, through which the tip surface of the cutter guide can pass, and along the diagonal of the opening of the hole, A guide jig having

2. The guide jig according to claim 1, characterized in that a plurality of guide holes are provided along the longitudinal direction of the original key.

3. The guide jig according to claim 2, characterized in that the plurality of guide holes are provided corresponding to every other position where the plurality of holes are formed.

4. The guide jig according to claim 2, characterized in that the multiple guide holes are of the same size.

5. A support surface held together with the original key in the key machine, A spacer is disposed between the support surface and the original key, The guide jig according to claim 1, characterized by having the following features.

6. A cutter that grinds the surface of a blank key by rotating in contact with the surface of the blank key, A first holding portion for holding the blank key, A second retaining part that holds the original key, which has a truncated pyramidal hole formed on its surface, A cutter guide whose tip surface is sized to fit into the bottom surface of the hole, and whose tip surface is in contact with and away from the bottom surface of the hole, A guide jig according to claim 1, A moving mechanism that moves the cutter and the cutter guide synchronously in a direction such that the tip surface of the cutter guide contacts the hole and the cutter contacts the blank key, A support mechanism that fixes the relative positions of the first and second holding parts, and supports the first and second holding parts so that they can move synchronously in the direction along the diagonal, such that the cutter grinds the round hole formed on the surface of the blank key in the direction along the diagonal of the opening of the hole, with the tip surface of the cutter guide inserted through the guide hole of the guide jig and in contact with the bottom surface of the hole, A key machine characterized by having the following features.

7. The blank key is held by the first retaining part, The second retaining part holds the original key, which has a truncated pyramidal hole formed on its surface. A moving mechanism moves a cutter that grinds the surface of the blank key by rotation, and a first cutter guide whose tip is sized to fit into the bottom of the hole, and which moves toward and toward the hole of the original key, in a synchronous manner in the direction toward contact with the blank key and the first cutter guide, respectively, thereby forming a round hole corresponding to the hole on the surface of the blank key. The mask surface of the guide jig described in claim 1 covers the surface of the original key in which the round hole is formed, The moving mechanism causes the tip of a second cutter guide, which is sized to fit into the guide hole of the guide jig and whose tip surface fits into the bottom surface of the hole, to be inserted into the guide hole and in contact with the hole of the original key, and the support mechanism causes the second cutter guide to move relative to the guide hole, and the first and second holding parts to move synchronously while their relative positions are fixed so that the cutter grinds the round hole in a direction along the diagonal of the opening of the hole. A method for manufacturing duplicate keys, characterized by the following features.

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