JPH0225233A - Key manufacturing method and key manufactured by method concerned - Google Patents

Abstract

PURPOSE:To manufacture a key of a free shape with high productivity by small pressure by laminating a reference thin plate and a prescribed number of laminated thin plates which have been blanked from a stock by engaging recessed and projecting parts which have been formed on their surfaces, and fixing them as one body. CONSTITUTION:A reference thin plate 6 of a prescribed shape and four pieces of laminated thin plates 2-5 are blanked from a stock by a press. An engaging recessed part 6a is formed in a prescribed part on at least one face of the thin plate 6, and also, embossing is performed to prescribed parts of the thin plates 2-5, and engaging projecting parts 2a-5a and engaging recessed parts 2b-5b are formed on one surface and the other surface, respectively. Subsequently, the projecting part 5a of the thin plate 5 is pressed into the recessed part 6a of the thin plate 6 and caulked so that the projecting part 5a cannot fall off from the recessed part 6a. In the same way, the thin plates 4-2 are laminated successively, fixed to one piece of plate being the same substantially as the conventional case, and a key 1 is obtained thereby.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a key manufacturing method and a key manufactured by the method, and particularly to a key manufacturing method for manufacturing a key in which a plurality of thin plates are stacked in a predetermined order and fixed integrally. and a key manufactured by the method.

[Conventional technology]

Regarding an example of a conventional key and a method for manufacturing the key, Part 23
This will be explained with reference to FIGS. A conventional key consists of only one key-shaped flat plate 11 as shown in FIG. The key-shaped flat plate 11 is punched out of a plate material such as titanium or stainless steel. Incidentally, the key-shaped flat plate 11 is generally provided with a joint window 11a through which the ring portion of the key holder passes. In order to align the keyhole insertion part 11c of the key-shaped flat plate 11 with the keyhole, there is a step or recess in the thickness direction as shown in FIGS. 24 and 25.
In order to form Ie, cutting is performed on the keyhole insertion portion 11c. Further, by appropriately attaching a mark 10a to the head IH of the flat plate 11, the flat plate 11 is finished into a desired key 10 as shown in FIG. On the other hand, in addition to this method, after punching out a single key-shaped flat plate 11 from a plate material in the same manner as this method, the flat plate 11
Pressing is performed on the keyhole insertion part 11c to form recesses 11d and 11e, and the head! mark lr
There is also a method of finishing the flat plate 11 into a desired key by adding Qa.

[Problem to be solved by the invention]

However, the former method for manufacturing the conventional key has the following problems. That is, since titanium and stainless steel have low thermal conductivity, the heat generated during cutting of the flat plate 11 is difficult to escape to the outside and tends to accumulate on the cut surface. For this reason, if the cutting speed is increased, the cut surface of the flat plate 11 will seize, so the cutting speed must be reduced, resulting in poor productivity. On the other hand, the latter method has the following problems. That is, the recess 11d is formed in the keyhole insertion portion 11c,
A great pressure is required to perform press working to form 11e. Moreover, although it is possible to uniformly extend the flat plate 11 in the direction perpendicular to the direction in which the flat plate 2 is compressed by simple press working on the flat plate 11, it is not possible to adjust the degree of elongation in the compression direction. Therefore, it is impossible to form a slope in the compression direction, and therefore the degree of freedom in the shape of the key itself is reduced. In addition, it is generally necessary to provide a joint window 11a for the key to pass through the ring part of the key holder, and if the crosspiece width e of the joint window 11a is made too small when designing the shape of the key, it will be difficult during press processing. Crosspiece z
Since b may bend, it cannot be made very small, and this also limits the degree of freedom in the shape of the key itself. The present invention has been devised in view of the above problems and to effectively solve them. Therefore, its purpose is
It is highly productive, does not require great pressure, and
It is an object of the present invention to provide a key manufacturing method capable of manufacturing a key with a more free shape, and a key manufactured by the method.

[Means to solve the problem]

A key manufacturing method according to the present invention and a key manufactured by the method are configured as follows to solve the problems of the prior art and to achieve the object thereof. That is, two methods are provided as the key manufacturing method according to the present invention. An engagement recess is formed at a predetermined location on at least one surface of the reference thin plate, and a stamping process is performed at a predetermined location on each of the laminated thin plates to form an engagement convex portion on one surface, which is engaged with the other surface. An unevenness forming step for forming recesses, and a fixing process for integrally fixing both thin plates by irremovably engaging each of the engagement protrusions with the respective engagement recesses between the thin plates stacked adjacent to each other. The steps are performed in order. In addition, the second method includes forming an engagement recess at a predetermined location on at least one surface of a reference thin plate punched portion for punching out the reference thin plate of the material, and forming an engagement recess at a predetermined location on at least one surface of the reference thin plate punched portion for punching out each of the laminated thin plates of the material. an unevenness forming step of forming the above-mentioned engagement protrusions on one side of each laminated thin plate punched portion of the material and forming the above-mentioned engagement recesses on the other surface by punching at predetermined locations; The standard thin plate punched portion is punched to obtain the reference thin plate having a predetermined shape, and the punched portions of the laminated thin plates of the material are punched to obtain the laminated thin plates of a predetermined shape.The fixing step is performed in sequence. It is something. In the first and second methods, the engagement recess of the reference thin plate may engage with the engagement protrusion of the laminated thin plate that is overlapped adjacent to the reference thin plate; It may be a bottom hole or a through hole. In the key according to the present invention, the predetermined number of laminated thin plates are stacked on at least one surface of the reference thin plate in a predetermined order, so that the reference thin plate and the predetermined number of laminated thin plates are integrally formed. and the first and second
manufactured by any of the following methods.

[Actions and effects of the invention]

According to the first key manufacturing method according to the present invention, the step of punching out the reference thin plate and the predetermined number of laminated thin plates from a material, the reference thin plate having the engagement recess, and each of the laminated thin plates having The unevenness forming step of forming the above-mentioned engagement recess and the above-mentioned engagement protrusion, and the engagement of each of the above-mentioned engagement protrusions into the above-mentioned engagement concave portions in a way that cannot be removed between two adjacently stacked thin plates. By sequentially performing the fixing process of fixing the predetermined number of laminated thin plates to the reference thin plate, it is possible to easily manufacture one laminated key. is no longer necessary, and productivity can be improved. That is, for example, when forming a desired recess in the keyhole insertion portion of the key, if a step is created between adjacent thin plates, there is no need to perform cutting as in the conventional case. Further, according to the first key manufacturing method, as described above, for example, when forming a dent in the keyhole insertion portion of the key, the dent can be formed by a step created between mutually adjacent thin plates. can be easily formed. That is, compared to the conventional press work in which a large pressure is applied to the keyhole insertion portion of the key to form a recess, no large pressure is required at all. More specifically, for example, when providing a joint window to connect to a key holder, if the width of the crosspiece is less than a predetermined value, the crosspiece itself will deform if it is formed using a large pressure as in the past. There were certain restrictions on dimensions. However, according to the above method, the joint window can be easily formed in the punching process, and in this case, even if the punching work is performed by press working, a small pressure is sufficient, so the width of the crosspiece is There are no restrictions on dimensions as described above, and design can be made more freely. Further, according to the first key manufacturing method, for example, when forming an inclined surface around the joint window of the key, a step-like inclined surface can be easily formed by creating a step between each adjacent thin plate. This allows greater freedom in the shape of the key at the time of design. That is,
In the conventional key manufacturing method, such an inclined surface cannot be formed by pressing, but can only be formed by cutting, and if the inclined surface is attempted to be formed by cutting, productivity will be poor. There was a certain amount of time. According to the first key manufacturing method, a key having such an inclined surface can be manufactured efficiently and with a small pressure. Further, in the first key manufacturing method, when fixing the thin plates, the engaging protrusions are engaged with the engaging recesses, thereby eliminating the need for adhesive or the like.
Fixing work can be done easily. Further, when forming the respective engaging convex portions and the respective engaging concave portions of each of the laminated thin plates, they are simultaneously formed by punching, so that productivity can be further improved. Furthermore, according to the second key manufacturing method, an unevenness forming step of forming the engagement recess in the reference thin plate punched portion, and the engagement recess and the engagement protrusion in the laminated thin plate punched portion of each material. and a punching step of punching out the reference thin plate and the laminated thin plate from each of the above materials, and a step of punching out each of the engaging convex portions into the respective engaging concave portions between the two adjacently stacked thin plates. By sequentially performing the fixing step of fixing the laminated thin plate to the reference thin plate by engaging with the reference thin plate, it is possible to easily manufacture one laminated key. This effect can be achieved. Further, both the keys manufactured by the first key manufacturing method and the keys manufactured by the second key manufacturing method have good productivity, do not require great pressure during manufacturing, and It can be manufactured into more flexible shapes.

【Example】

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a key manufacturing method according to the present invention and a key manufactured by the method will be described below with reference to FIGS. 1 to 22. DESCRIPTION OF THE PREFERRED EMBODIMENTS A key manufacturing method according to a first embodiment of the present invention and a key manufactured by the method will be described below with reference to FIGS. 1-12. The keys l manufactured by the key manufacturing method according to the first embodiment each have approximately rectangular heads 2c, 3c, and 4c.
, 5 c, 6 c, and the part inserted into the keyhole, that is, the first part of the head. Five key-shaped thin plates consisting of keyhole insertion portions 2d, 3d, 4d, 5d, and 6d extending downward in FIGS. 4 and 6, that is, the first, second, and the above laminated thin plates. Third
．． The fourth thin plates 2, 3, 4.5 and the fifth thin plate 6 as the reference thin plate are stacked in this order and fixed integrally. In this embodiment, the key 1 is manufactured by sequentially performing the following four steps. (1) Punching process The above-mentioned five thin plates 2, 3, 4, and 5.6 are each punched out from a stainless steel plate as a raw material using a press. In the first embodiment, the third thin plate 4 has a symmetrical shape with respect to the axial center line 13, as shown in FIGS. 4 and 5. On the other hand, the first thin plate 2 and the second thin plate
The thin plates 3 have the same shape and have the same shape as the first. As shown in FIGS. 2 and 3, the shape is such that approximately the left half of the keyhole insertion portion 4d of the third thin plate 4 is cut out with respect to the center line 13 in the axial direction. On the other hand, the fourth thin plate 5 and the fifth thin plate 6 have the same shape, and the sixth thin plate 5 and the fifth thin plate 6 have the same shape. As shown in FIGS. 7 and 8, the third thin plate 4
The shape is such that approximately the right half of the keyhole insertion portion 4d with respect to the center line 13 is cut out. As can be seen from FIG. 2, the first thin plate 2 and the second thin plate 3 are both flat plates with a constant thickness, and the upper ends of the respective heads 2 c and 3 c are penetrated in the thickness direction. Opening 2e for forming a roughly rectangular joint hole. It has 3e. Further, the openings 2e of the first thin plate 2 and the second thin plate 3 of the third thin plate 4, the fourth thin plate 5, and the fifth thin plate 6. The opening 2 is located at a location corresponding to the location where the opening 3e is provided.
e, 3 Opening 4 for forming a joint hole with the exact same shape as e
e, 5 e, and 6 e are provided, respectively. Further, the third thin plate 4, the fourth thin plate 5, and the fifth thin plate 6 are flat plates having a constant thickness like the first thin plate 2 and the second thin plate 3, and therefore the third thin plate 4, the fourth thin plate 5, The cross section of the fifth thin plate 6 in the potato direction is approximately the same as the longitudinal cross section of the first thin plate 2 and the second thin plate 3 shown in FIG. (2) Irregularity forming step The four corners of the head 6c of the fifth thin plate 6 and the fifth thin plate 6
A circular through hole 6b penetrating in the thickness direction is punched out at a total of 8 locations, 4 at predetermined intervals on the center line 14 in the axial direction, as shown in FIGS. 6 and 8. ,・
..., opens 6b. Each through hole 6b is connected to the fifth thin plate 6.
The engagement recesses 6a function as the respective engagement recesses 6a. On the other hand, regarding the remaining four thin plates 2, 3, and 4.5, eight front faces 2r, 3f, corresponding to the eight locations of the fifth thin plate 6, respectively.
4 f, 5 Back from f side 2 g, 3 g, 4
As can be seen from Figures 1.3, 4, 5.6 and 7, the front faces of the eight locations 2f, 3f, 4f, 5 are punched out toward the g side.
r-side circular engagement recess 2b, -, 2b13b, 1,
3b. 4b, . . . , 4b, 5b, . . . , 5b1 have engaging convex portions 2a, . 3a,..., 3a, 4a,..., 4a, 5a,
..., 5a is formed. In the first embodiment, the through hole 6b of the fifth thin plate 6 is
The inner diameter of each of the engaging recesses and the outer diameter of each of the engaging convex portions of the first to fourth thin plates 2, 3, 4.5 are all approximately equal. (3) Fixing process: Pressing each engagement convex portion 5a of the fourth thin plate 5 into each through hole 6a of the fifth thin plate 6 from the front 6r side of the thin plate 6,
The respective engaging convex portions 5a are caulked so that they cannot come out of the respective through holes 6a. Further, each of the engagement convex portions 4a of the third thin plate 4 is press-fitted into each of the engagement concave portions 5b of the fourth thin plate 5, so that each of the engagement convex portions 4a cannot come out from each of the engagement concave portions 5b. Caulk it like this. Similarly, each engagement convex portion 3a of the second thin plate 3 is placed in each engagement recess 4b of the third thin plate 4, and each engagement convex portion 3a of the first thin plate 2 is placed in each engagement concave portion 3b of the second thin plate 3. The engagement protrusions 2a are press-fitted so that the engagement protrusions 3a cannot come out of the engagement recesses 4b, and the engagement protrusions 2a are pressed into the engagement recesses 3b. Caulk it so that it is impossible to escape. As a result, each of the heads 2c, 3c, 4c, 5c, 6 of the first to fifth thin plates 2, 3, 4, 5.6
c are superimposed to form the head 1a of the key l,
Further, the keyhole insertion portions 2d, 3d, 4d, 5d, 6d of the five thin plates 2, 3, 4, 5.6 are overlapped to form the keyhole insertion portion 1b of the key l, Thin plates 2, 3.
4, 5.6 are integrated into a layered key l according to this embodiment.
is formed as a single flat plate substantially as in the conventional case. Furthermore, as can be seen from Figures 9 and 12, the above 5
Openings 2e, 3 in each of the thin plates 2.3.4, 5.6
e, 4 e, 5 e, and 6 e match each other to form the joint window 1c of the key I. (4) Marking process If necessary, mark If as shown in FIG. 12 is attached to the front surface 1d of the head 1a of the key 1, that is, the front 2r of the head 2c of the first thin plate 2, and the key 1 is marked. Finish it as a product. According to the key manufacturing method according to the first embodiment, the five thin plates 2, 3, and 4°5.6 are punched out of the stainless steel plate (the punching process and the first to fourth thin plates 2. 3
, 4.5 respectively front 2 f, 3 f. 4 r, 5 '+, :-c Above engaging recess 2 b, 3
b, 4 b, 5 b, each back 2g, 3g
, 4g, and 5g have the above-mentioned engaging convex portions 2a. 3 a, 4 a, 5 a, while the fifth
an unevenness forming step of forming the through holes 6b in the thin plate 6;
While press-fitting each engaging protrusion 5a of the fourth thin plate 5 into each through hole 6b of the fifth thin plate 6, the first to fourth thin plates 23.4.5
For this, the engaging convex portions of one of the two thin plates stacked adjacent to each other are press-fitted into the engaging concave portions of the other thin plate, and the other four thin plates are inserted into the fifth thin plate 6. 2,
3 and 4.5, and the front side 1 of the head 1a.
By sequentially performing the marking process of attaching marks 1r to d, it is possible to easily manufacture one layered key l, which eliminates the need for the conventional cutting process and improves productivity. I can do it. Further, in the key manufacturing method according to the first embodiment, the width of the keyhole insertion portions 2d and 3d of the first and second thin plates 2 and 3 is reduced by the width of the keyhole insertion portion 4d of the third thin plate 4 through the fixing step. The right edge of the keyhole insertion portions 2d and 3d of the first and second thin plates 2.3 in FIG. 1 is aligned with the right edge of the third F# plate 4 in FIG. and the ninth and eleventh thin plates 2.3 to fix the second thin plate 2.3 to the third thin plate 4.
As can be seen from the figure, a step 15 is formed on the front surface 1d of the keyhole insertion portion 1b of the key l. On the other hand, the fourth and fifth
The width of the keyhole insertion portions 5d, 6d of the thin plate 5.6 is narrower than the width of the keyhole insertion portion 4d of the third thin plate 4, and the keyhole insertion portions 5d, 6d of the fourth and fifth thin plates 5.6 are shown in FIG. The middle left edge of the third thin plate 4 is aligned with the left edge of the third thin plate 4 in FIG.
In order to fix the thin plate 5.6 to the third thin plate 4, a step 16 is formed on the back surface 1e of the keyhole insertion portion 1b of the key 1, as can be seen from FIGS. 9 and 11. Therefore, in conventional press working, the keyhole insertion portion 1 of the key I is
Compared to the method in which a step is formed by applying a large pressure to b, no large pressure is required at all. By the way, when comparing each of the five thin plates 2, 3, 4, and 5.6 with a single conventional key, the five thin plates 2, 3, 4, and 5.6 are compared with one conventional key.
3, 4, and 5.6 can be considered as the conventional single key divided into five parts in the thickness direction, and the five thin plates 2.3,
4, 5, and 6 are thinner than the thickness of one conventional key. Therefore, in the punching process, openings 2e, 3e, 4e, 5e for forming joint windows are formed in each of the five thin plates 2.3, 4, 5.6 by press working.
6 e, it is sufficient to apply less pressure than to form a seam in a conventional key, so that the opening 2 in each of said plates 2, 3° 4.5.6
There is no restriction that the width dimensions of the crosspieces e, 3e, 4e, 5e, and 6e must be greater than a predetermined value. Therefore, as shown in FIGS. 9 and 12, each opening 2
e, 3 e, 4 e, 5 e, and 6 e are matched, so there is no restriction on the width of the crosspiece of the joint window 1c of the key l, and compared to the conventional case, the width of the crosspiece is Width dimensions can be designed more freely. In addition, in the key manufacturing method according to the first embodiment, when fixing the fourth thin plate 5 and the fifth thin plate 6, each of the engaging protrusions 5a of the fourth thin plate 5 is connected to the fifth thin plate 5. thin plate 6
By press-fitting into each of the above-mentioned through holes 6b, and when fixing the first to fourth thin plates 2°3.4.5, one of the two thin plates stacked adjacent to each other is By engaging the engaging convex portions of one thin plate with the engaging concave portions of the other thin plate, no adhesive or the like is required, so that the fixing work can be easily performed. Further, when forming the first to fourth thin plates 2, 3, and 4.5, the engaging convex portions and the engaging concave portions are simultaneously formed by punching, Since the engagement recess 6a is formed in the fifth thin plate 6 by punching, productivity can be further improved. As can be seen from the above description, the key l according to the first embodiment has good productivity, does not require great pressure during manufacturing, and can be manufactured into a more flexible shape than conventional keys. It is something. In the key manufacturing method according to the first embodiment, the above-mentioned unevenness forming step is performed after the above-mentioned punching step, but the order in which these two steps are performed may be reversed. That is, the first to fourth thin plates 2 of the stainless steel plate
, 3, 4.5 are punched out at predetermined locations to form the engagement convex portion and the engagement recess, and the fifth thin plate 6 of the stainless steel plate is punched out at predetermined locations. After forming the above-mentioned through holes by punching at the locations, the five thin plates 2,
3, 4, 5.6 may be punched out. Second Embodiment A key manufacturing method according to a second embodiment of the present invention and keys manufactured by the method will be described below with reference to FIGS. 13 to 22. As shown in FIG. 22, the key manufacturing method according to the second embodiment includes a key 7 having the same external shape as the key l manufactured by the key manufacturing method according to the first embodiment. That is, the first thin plate 8 as the laminated thin plate and the second thin plate 9 as the reference thin plate are superimposed on each other and are integrally fixed. As shown in FIGS. 13 and 16, the thin plates 8.9 have approximately rectangular heads 8c and 9c, and a portion inserted into the keyhole, that is, a lower portion of the heads 8c and 9c in FIGS. 13 and 16, respectively. It consists of keyhole insertion parts 8d and 9d extending to . The keyhole insertion portion 8d of the first thin plate 8 has a first portion 8f along the long center line 17 that is bilaterally symmetrical with respect to the axial center line 17 of the ti8J plate 8, and a first portion 8f of the first portion 8f. 13th
It is divided into a second portion 8g located on the right side in the figure. On the other hand, the keyhole insertion portion 9d of the second thin plate 9 has a long center line 1 that is bilaterally symmetrical with respect to the axial center line 18 of the second thin plate 9.
8 and a second portion 9g located on the left side of the first portion 9r in FIG. In the second embodiment, the first thin plate 8 is the same as the first and second thin plates 2.3 in the first embodiment, as shown in FIG. On the other hand, as shown in FIG. 16, the second thin plate 9 has the same outer shape as the fourth and fifth thin plates 5.6 in the first embodiment. The two thin plates 8.9 used in the second embodiment are each provided with a head 8c in the thickness direction at the upper end of each head 8c, similar to the five thin plates used in the first embodiment. It has openings 8e and 9e for forming a generally rectangular joint hole passing through it. (2) Bending step The keyhole insertion portion 8d of the first thin plate 8 is bent toward the front side 8h with respect to the head 8c. so that the front surface 8h of the head 8c and the front surface 8h of the keyhole insertion portion 8d are parallel to each other, and the back surface 81 of the head 8c and the back surface 81 of the keyhole insertion portion 8d are parallel to each other. , a slight constriction is created at the boundary between the head 8c and the keyhole insertion portion 8d.As a result, the first
Front side 8h of head 8c of thin plate 8 and front side 8 of keyhole insertion part 8d
There is a slight step between the head 8c and the keyhole insertion portion 8d.
A slight step 8j as shown in FIG. 4 occurs. On the other hand, by bending the keyhole insertion portion 9d of the second thin plate 9 toward the back 91 side with respect to the head 9c, a constriction similar to the first thin plate 8 is formed at the boundary between the head 9c and the keyhole insertion portion 9d. cause As a result, a step 9j as shown in FIG. 17 is created between the front surface 9h of the head 9c of the second thin plate 9 and the front surface 9h of the keyhole insertion portion 9d, and the back surface 91 of the head 9c A step is also formed between the keyhole insertion portion 9d and the back surface 91. (3) Crushing process The front surface 8h of the first portion 8f of the keyhole insertion portion 8d of the first thin plate 8 is crushed, and as can be seen from FIGS. 14 and 15, the front surface 8h of the first portion 8r is and the above head 8c
Eliminate the above-mentioned step difference with the front 8h. As a result, the first
The second portion 8g remains on the front surface 8h of the thin plate 8 in a state where it is raised higher than other portions. On the other hand, the back surface 91 side of the first portion 9r of the keyhole insertion portion 9d of the second thin plate 9 is crushed, and as can be seen from FIGS. 17 and 18, the back surface 91 of the first portion 9r and the head The above-mentioned level difference between the portion 9c and the back surface 91 is eliminated. As a result, the second portion 9g remains on the back surface 91 of the second thin plate 9 in a state where it is more raised than the other portions. (4) Irregularity forming step The four corners of the head 8c of the above 1i4 provisional 8 and the keyhole insertion part 8d
At a total of seven locations, including three locations spaced apart by a predetermined distance on the center line 17, punching is performed from the back surface 81 side to the front surface 8h side, and as can be seen from FIGS. 13 and 15, the seven locations are On the front side 8h, there is a circular engagement protrusion 8a,
・, 8a, there are circular engagement recesses 8 on the back surface 81 side of the seven locations.
b, . . . , 8b are formed. On the other hand, seven places of the second thin plate 9 corresponding to the seven places of the first thin plate 8 are stamped, and as can be seen from FIGS. 16 and 18, circular through holes 9b are formed through the second thin plate 9 in the thickness direction. ,..., begins 9b. Each of the through holes 9b corresponds to each engagement recess 9 of the second thin plate 9.
It functions as a. As can be seen from FIG. 18, the inner diameter of each through hole 9b is approximately 1/3 of the thickness of the second thin plate 9 from the back surface 91 of the second thin plate 9. The outer diameter of the engagement convex portion 8a is approximately the same as the outer diameter, and the remaining approximately two-thirds of the dimension gradually increases from the rear surface 81 side to the front surface 8h side. (5) Fixing process: press-fitting each engagement convex portion 8a of the first thin plate 8 into each through hole 9b of the second thin plate 9 from the back surface 91 side of the thin plate 9;
The respective engaging convex portions 8a are caulked so that they cannot come out from the respective through holes 9b. As a result, the 19th and 22nd
As shown in the figure, each head 8 of the first and second thin plates 8.9
c and 9c overlap, so that the head 7a of the key 7
On the other hand, the keyhole insertion portion 7b of the key 7 is formed by overlapping the keyhole insertion portions 8d and 9d of the first and second thin plates 8.9, and the two thin plates 8.9 are layered. The key 7 according to the second embodiment can substantially function as a single flat plate similar to the conventional case. As can be seen from FIGS. 19 and 22, the openings 8e and 9e of the first and second thin plates 8.9 align with each other to form the joint window 7C of the key 7. Further, the inner surface of each through hole 9b of the second thin plate 9 has the second
Since the thin plate 9 is tapered over approximately 2/3 of the dimension from the front side 9h, the first thin plate 8 is connected to the second thin plate 9.
When caulking the thin plate 9, as can be seen from FIG. 21, the tip of each engagement convex portion 8a of the first thin plate 8 expands radially outward, and the outer diameter of the tip expands to fit the respective through holes. It is larger than the inner diameter of the opening on the side into which each of the engagement protrusions 8a of 9b is press-fitted. For this reason, even if a force is applied to pull out each engaging protrusion 8a from each through hole 8b, each engaging protrusion 8a will not come out of each through hole 8b. (6) Marking process If necessary, mark 7d as shown in FIG.
The key 7 is completed as a product. According to the key manufacturing method according to the embodiment of the present invention, the first and second thin plates 8.9 are punched out from the steel plate, and the keyhole insertion portion 8d of the first thin plate 8 is inserted into the head 8c. a bending step of bending the keyhole insertion portion 9d of the second thin plate 9 toward the back side 91 with respect to the head 9c; and a first portion of the keyhole insertion portion 8d of the first thin plate 8. 8r is crushed to form the first portion 8r.
While eliminating the level difference between the front surface 8h of the front surface 8h and the front surface 8h of the head portion 8c of the first thin plate 8, crushing is performed on the first portion 9r of the keyhole insertion portion 9d of the second thin plate 9. 9r and the back surface 91 of the head 9c of the second thin plate 9, the engaging protrusion 8a is formed on the front surface 8h of the first thin plate 8, and the engaging convex portion 8a is formed on the back surface 8. While forming the mating recesses 8b, the second thin plate 9 is formed with the through holes 9b, and each through hole 9b of the second thin plate 9 is filled with each engaging convex portion 8a of the first thin plate 8. One stacked key 7 can be easily assembled by sequentially performing a fixing process of press-fitting the first thin plate 8 to the second thin plate 9 and a marking process of attaching the mark tr to the front side Id. This eliminates the need for the cutting process required in the conventional case.
Productivity can be improved. Further, in the key manufacturing method according to the second embodiment, in the crushing step, the second portion 8g of the keyhole insertion portion 8d of the first thin plate 8 may be slightly raised on the front side 8h side than the other portions. At the same time, the second portion 9g of the keyhole insertion portion 9d of the second thin plate 9 can be slightly raised toward the back surface 9i side than the other portions. For this reason,
The thirteenth portion of the second portion 8g of the keyhole insertion portion 8d of the first thin plate 8
The pressure side edge in the figure matches the fabric side edge in FIG. 16 of the first part 9r of the keyhole insertion part 9d of the second thin plate 9, and In FIG.
By matching the middle pressure side edge in Figure 3, the first and second
The second lamina 9 can be easily positioned relative to the first lamina 8 such that the axial center lines 17.18 of each of the lamellas 8.9 coincide with each other. By positioning the second thin plate 9 with respect to the first thin plate 8 in this way and fixing both thin plates 8.9 to each other in the fixing step,
a keyhole insertion portion 8d of each of the first and second thin plates 8.9;
The first parts 8f, 9f of the first thin plate 8 overlap each other, while the second part 8g of the keyhole insertion part 8d of the first thin plate 8 does not overlap with any part of the second thin plate 9, and
The second portion 9g of the keyhole insertion portion 9d of the thin plate 9 is connected to the first thin plate 8.
It does not overlap with any part of the throat. Therefore, as can be seen from FIGS. 19 and 21, the keyhole insertion portion 7 of the key 7
A step 20 is formed on the front surface 7e of the keyhole insertion portion 7b, while a step 21 is formed on the back surface 7r of the keyhole insertion portion 7b. Therefore, compared to the conventional press working in which a large pressure is applied to the keyhole insertion portion 7b of the key 7 to form a step, no large pressure is required at all. By the way, when comparing each of the first thin plate 8 and the second thin plate 9 with a conventional single key, the first thin plate 8 and the second thin plate 9 have the same thickness as the conventional single key. It can be considered to be divided into two parts, the first thin plate 8 and the second thin plate 8.
The thickness of each thin plate 9 is thinner than the thickness of one conventional key. Therefore, when forming the openings 8e and 9e for forming a seam window in the first and second thin plates 8.9 by press working in the punching process, the seam window is formed in the single conventional key. Since it is sufficient to apply a smaller pressure than the above, there is no restriction that the crosspiece width of the openings 8e, 9e of each thin plate 8.9 must be greater than a predetermined value. Therefore, each frontage 8 e, 9 e
There is no restriction on the crosspiece width dimension L° of the joint window 7c of the key 7, which is formed by matching, and the crosspiece width dimension L° can be designed more freely than in the conventional case. can. Further, in the key manufacturing method according to the second embodiment, when fixing the first thin plate 8 and the second thin plate 9, each of the engaging protrusions 8a of the first thin plate 8 is connected to the second thin plate 8. thin plate 9
By press-fitting into each of the above-mentioned through holes 9b, no adhesive or the like is required, so the fixing work can be easily performed. In addition, each engaging convex portion 8a and each engaging concave portion 8 of the first thin plate 8
When forming the second thin plate 9, these are simultaneously formed by stamping, and the engagement recess 9a is formed by punching the second thin plate 9, thereby further improving productivity. can be done. As can be seen from the above description, the key 7 according to the second embodiment has good productivity, does not require great pressure during manufacturing, and can be manufactured into a more flexible shape than conventional keys. It is something. Also, the first and second thin plates 8.
9, each head 8c, 9c and keyhole insertion part 8d,
Since a constriction is formed at the border with 9d, when the first and second thin plates 8.9 are fixed to each other in the fixing process, as can be seen from FIG. 20, the keyhole insertion 17b of the key 7 is is thinner than the head 7a, which allows the key 7 itself to have an attractive design. The present invention is not limited only to the above-mentioned embodiments,
It can be implemented in various other ways. For example, in the two embodiments described above, the openings of each of the thin plates are perfectly aligned to form the joint windows 1c, 7c of the key 1.7, but the edges of the corresponding openings of each thin plate are When each of the laminated thin plates is positioned relative to the reference thin plate so that the parts are shifted little by little, the edge of the reference thin plate and the edge of each laminated thin plate are connected, forming a stepped shape in the thickness direction. A slope is formed. Such a stepped slope cannot be formed by conventional key manufacturing methods. Further, in the above-described embodiment, the materials of the respective thin plates are the same, but the materials of the respective thin plates may be different. However, it is preferable that the material of each of the thin plates be made of methane or porcelain. In this case, the colors of each of the thin plates may also be made different. For example, a golden colored thin plate and a silver colored thin plate are used, the golden colored thin plate and the silver colored thin plate are overlapped alternately, and the joint window 1c is
. By forming the step-like slope on the inner surface of 7c, the color appearing on the step-like slope can have fashionability.

[Brief explanation of the drawing]

FIG. 1 is a front view of the first and second thin plates after the unevenness forming step in the first embodiment of the key manufacturing method according to the present invention, and FIG.
3 is an enlarged sectional view of the main part taken along the line A-A in FIG. 1, FIG. 4 is a front view of the third thin plate after the unevenness forming process of the first embodiment, 5 is an enlarged sectional view of the main part taken along the line B-B in FIG. 4, FIG. 6 is a front view of the fourth and fifth thin plates after the unevenness forming process of the first embodiment, and FIG. FIG. 8 is an enlarged cross-sectional view of the main part of the fourth thin plate taken along line C-C, FIG. 9 is a cross-sectional view of the main part of the fifth thin plate taken along line C-C in FIG. 6, and FIG. 9 is shown in FIG. the first and second thin plates, and the fourth
Front view of the key obtained by fixing the third thin plate shown in the figure and the fourth and fifth thin plates shown in FIG.
The figure is an enlarged left side view of the key shown in Fig. 9, Fig. 1I is an enlarged cross-sectional view of the main part taken along line D-D in Fig. 9, and Fig. 12 is after marking the key shown in Fig. 9. 13 is a front view of the first thin plate after the unevenness forming step of the second embodiment of the key manufacturing method according to the present invention, and FIG. 14 is a sectional view taken along the line 1-1 in FIG. 13. , FIG. 15 is an enlarged sectional view of the main part taken along the line E-E in FIG. 13, FIG. 16 is a front view of the second thin plate after the unevenness forming process of the second embodiment, and FIG. 18 is an enlarged cross-sectional view of the main part taken along the line F-F in FIG. 16, and FIG. 19 shows the first thin plate shown in FIG. 13 and the second thin plate shown in FIG. 16. A front view of the key obtained by fixing the key, FIG. 20 is a sectional view taken along the line - in FIG. 19, and FIG.
Fig. 22 is a front view of the key after marking has been applied to the key shown in Fig. 19; Fig. 23 is a punching of the key manufacturing method using the conventional cutting process. A front view of the thin plate after the process, FIG. 24 is a front view of the key obtained by cutting the thin plate shown in FIG. 23, FIG. 25 is a sectional view taken along line M-M in FIG. The figure is a front view of the key shown in FIG. 24 after marking has been applied to the key. l...key, 2...laminated thin plate (first thin plate), 3...
・Laminated thin plate (second thin plate), 4... Laminated thin plate (third thin plate), 5... Laminated thin plate (fourth thin plate), 6... Reference thin plate (fifth thin plate), 2 a, 3 a , 4 a, 5 a... engaging convex portion of laminated thin plate, 2 b, 3 b, 4 b, 5 b.
... Engagement recess of laminated thin plate, 6a... Engagement recess of reference thin plate, 7... Key end... Laminated thin plate (first thin plate), 9... Reference thin plate (second thin plate), 8a. . . . Engagement convex portion of the laminated thin plate, 8b . . . Engagement recessed portion of the laminate, 9a . . . Engagement recessed portion of the reference thin plate. Patent Applicant: Tokai Rika Denki Seisakusho Co., Ltd. Agent: Patent Attorney: Aohaku Ao and 2 others

Claims (3)

[Claims] (1) A punching step of punching out a reference thin plate (6; 9) of a predetermined shape and a predetermined number of laminated thin plates (2, 3, 4, 5; 8) of a predetermined shape from a material; and the reference thin plate (6; 9). At the same time, an engaging recess (6a; 9a) is formed at a predetermined location on at least one surface of the laminated thin plate (2, 3, 4, 5; Engagement protrusions (2a, 3a, 4a
, 5a; 8a) and engagement recesses (2b, 3) on the other surface.
b, 4b, 5b; 8b), and between the thin plates stacked adjacent to each other, each of the engaging convex portions is irremovably engaged with the respective engaging concave portions to form both thin plates. A key manufacturing method characterized by sequentially performing a fixing step of integrally fixing. (2) A reference thin plate (6; 9) of the material is punched. Engagement recesses (6a; 9a) are formed at predetermined locations on at least one surface of the punched portion of the reference thin plate (6; 9), and each laminated thin plate (2, 3) of the material is , 4, 5; 8) are stamped out at predetermined locations on the punched parts of the laminated thin plates, and the above-mentioned engaging protrusions (2a, 3
a, 4a, 5a; 8a) and forming each of the engagement recesses (2b, 3b, 4b, 5b; 8b) on the other surface; and punching out the reference thin plate punched portion of the material. a punching step of obtaining the reference thin plate (6; 9) having a predetermined shape, and punching out each of the laminated thin plate punched portions of the material to obtain each of the laminated thin plates (2, 3, 4, 5; 8) having a predetermined shape; , A fixing step of integrally fixing the two thin plates by irremovably engaging each of the engaging convex portions with the respective engaging concave portions between the thin plates stacked adjacent to each other is performed in sequence. key manufacturing method. (3) The predetermined number of laminated thin plates (2, 3, 4, 5; 8) on at least one surface of the reference thin plate (6; 9).
are stacked in a predetermined order, and the reference thin plate (6; 9) and the predetermined number of laminated thin plates (2, 3, 4, 5; 8) are integrally fixed, and A key manufactured by the key manufacturing method according to 2.