JPH0610543A - Manufacture of cylinder lock - Google Patents

Abstract

PURPOSE:To prevent electrolytic corrosion between dissimilar metallic parts constituting a cylinder lock. CONSTITUTION:A key cylinder 12 with a plurality of slots 13 is formed of a first metal, and a tumbler 14 composed of a second metal having an ionization tendency different from the first metal is press-molded. The surface of a tumbler material is coated with an insulating resin to form a coating 22, and the tumbler material with the coating 22 is press-molded, thus shaping the tumbler 14. The tumblers 14 are inserted into the slots 13 of the key cylinder 12 together with springs 23, and the key cylinder 12 is arranged into a case 11, thus manufacturing a cylinder lock.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cylinder lock having a high electrolytic corrosion resistance.

[0002]

2. Description of the Related Art Cylinder locks having a case and a key cylinder rotatably arranged in the case are used in various locking devices. A plurality of slots are formed in the key cylinder of the cylinder lock, and a tumbler is slidably arranged in each slot. When the regular key is not inserted in the key cylinder, the tumbler locks in the tumbler groove formed in the case to prevent the key cylinder from rotating.However, when the regular key is inserted in the key cylinder, Allow the key cylinder to rotate away from the tumbler groove. Cylinder lock cases and key cylinders are typically formed by zinc die casting, and tumblers are manufactured by pressing a brass material.

After the case and the key cylinder are molded by zinc die casting, they are plated with zinc for smoothing the surface, and further treated with chromic acid. By galvanization,
Unevenness and voids on the surface of the case and the key cylinder are filled with zinc to form a smooth flat surface. Thereby, the key cylinder can be smoothly rotated in the case.
However, since chromic acid is harmful to the human body, it is desirable to avoid chromic acid treatment as much as possible.

[0004]

By the way, in the conventional cylinder lock, since the case and the key cylinder and the tumbler are made of different metals, electrolytic corrosion occurs in the case and the key cylinder to shorten the life of the cylinder lock. There is a case. That is, since zinc forming the case and the key cylinder has a greater ionization tendency than the brass forming the tumbler,
Electric current flows between dissimilar metals and electrolytic corrosion occurs. In particular, in a cylinder lock for automobiles, when water containing salt that has been sprayed on the road surface to prevent freezing enters the inside, the cylinder lock corrodes in a very short time due to electrolytic corrosion, resulting in damage or malfunction.

Therefore, a method has been proposed in which each component of the cylinder lock is plated with a corrosion-resistant metal to prevent electrolytic corrosion between different metals. However, this method requires expensive plating equipment and must perform the plating process. In addition, before performing the metal plating process, it is necessary to perform a process for removing burrs at the corners of each part of the cylinder lock by barrel polishing or the like. Burrs can be removed by barrel polishing the tumbler, but as shown in FIGS. 3 and 4, there is a drawback that the corner 33 of the tumbler 32 that engages with the tumbler groove 31 of the case 30 is also rounded off. If the corners 33 of the tumbler 32 are rounded off, picking (unauthorized unlocking) is facilitated and the locking strength is lowered. Even when barrel polishing is performed on the case 30 having the tumbler groove 31, the corner portion 34 of the tumbler groove 31 is used.
Will be rounded and the locking strength will decrease.

Therefore, an object of the present invention is to provide a cylinder lock having sufficient locking strength and electrolytic corrosion resistance.

It is another object of the present invention to provide a method for manufacturing a cylinder lock which can be easily manufactured without performing deburring and plating on a tumbler.

[0008]

A method of manufacturing a cylinder lock according to the present invention comprises a step of forming a key cylinder having a plurality of slots with a first metal and a step of forming a key cylinder having a different ionization tendency from the first metal. A step of applying an insulating resin to the surface of a tumbler material made of a second metal to form a coating, a step of press-forming a tumbler material having a coating to form a tumbler, and a spring in a slot of a key cylinder. It includes the steps of inserting a tumbler and arranging the key cylinder in the case.

[0009]

[Function] After applying the insulating resin to the surface of the tumbler material,
The corners of the press-molded tumbler are acute, and burrs partially project. A coating thicker than the protruding amount of the burr is formed on the main surface of the tumbler, but the resin does not adhere to the corners. Therefore, when the cylinder lock is assembled, the burr of the tumbler does not contact the key cylinder, so that the cylinder lock can be smoothly operated. Further, since the corner portion of the tumbler is held in an acute angle state, it has a large locking strength with respect to the tumbler groove of the case. Further, since the tumbler is coated with a coating, even if the tumbler and the key cylinder or the case are made of different kinds of metals, they are kept in an insulated state from each other, and it is possible to prevent electrolytic corrosion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cylinder lock manufacturing method according to the present invention will be described below with reference to FIGS.

As shown in FIG. 2, a cylinder lock 10 according to the present invention has a case 11, a key cylinder 12 rotatably arranged in the case 11 and formed of zinc as a first metal, and a key cylinder 12. A tumbler 14 slidably disposed in each of the plurality of slots 13 formed in the first and second slots and formed of brass as the second metal. When the regular key is not inserted into the key cylinder 12, the tumbler 14 is locked in the tumbler groove 15 formed in the case 11 to prevent the key cylinder 12 from rotating, and the regular key is inserted into the key cylinder 12. At this time, the key cylinder 12 is allowed to rotate away from the tumbler groove 15 of the case 11. Zinc has a large ionization tendency with respect to brass containing copper, that is, brass.

As shown in FIG. 1, the tumbler 14 is coated with an electrically insulating and thermosetting coating 22. The tumbler 14 has a first main surface 16, a second main surface 17, an outer side surface 18, and an inner side surface 19, and the first main surface 16 intersects the outer side surface 18 and the inner side surface 19. Burrs 20 and 21 are formed at the corners when the tumbler 14 is press-molded. The maximum thickness of the coating 22 that covers the first major surface 16 is larger than the protruding length of the burrs 20 and 21 formed at the corners of the tumbler 14.

When the cylinder lock 10 is manufactured, the key cylinder 12 having the plurality of slots 13 is formed by zinc die casting. Further, a tumbler material made of brass is coated with a coating material which is an insulating resin by spray coating, and then the tumbler material is pressed to form the tumbler 14. This coating material is liquid polytetrafluoroethylene having a trade name "SOLVEST" containing molybdenum disulfide and graphite, and adheres to the surface of the coating material in a uniform thickness. Burrs 20 and 21 at the time of press molding of the tumbler 14 are formed at corners where the first main surface 16 and the outer surface 18 and the inner surface 19 intersect. A coating 22 of about 50 to 100 μm is formed as a smooth surface on the first main surface 16 and the second main surface 17 of the tumbler 14. The maximum thickness of the coating 22 covering the first major surface 16 is about 10
Burr 20 formed at the corner of the tumbler 14 at 0 μm,
21 is greater than the protruding length. Further, the insulating resin is not attached to the outer side surface 18 and the inner side surface 19. Subsequently, the tumbler 14 is inserted into the slot 13 of the key cylinder 12 together with the spring 23 (FIG. 2), and the key cylinder 12 is placed in the case 11.

When the cylinder lock 10 is assembled, the burr of the tumbler 14 does not contact the key cylinder 12 due to the thickness of the coating 22, so that the cylinder lock 10 can be operated smoothly. Further, since the corner portion of the tumbler 14 is held in an acute angle state, it becomes difficult to perform a picking operation (unauthorized unlocking), and a large locking strength is generated in the tumbler groove 15 of the case 11. Furthermore, since the tumbler 14 is covered with the coating 22, even if the tumbler 14 and the key cylinder 12 or the case 11 are made of different kinds of metals, they are kept electrically insulated from each other, and electrolytic corrosion can be prevented. It will be possible.

In this embodiment, since the tumbler is coated with a coating agent, electrolytic corrosion can be prevented by contact between different kinds of metal parts in the cylinder lock. As a result, it has been found that the amount of electrolytic corrosion of the cylinder lock can be reduced to 1/10 of the conventional one.

The embodiment of the present invention is not limited to the above-mentioned embodiment, and can be modified.

(1) Although polytetrafluoroethylene is described as the electrically insulating resin, other electrically insulating and thermosetting resins such as phenol resin, urea resin, melamine resin, polyester resin or silicone resin may be used. May be used.

(2) The key cylinder 12 coated with an electrically insulating resin may be used together.

(3) The application of the electrically insulating resin may be performed by spray coating, or by another method such as dipping or dipping.

[0020]

According to the present invention, since the tumbler is coated with the electrically insulating resin, the following effects can be obtained.

(1) Electrolytic corrosion due to contact between dissimilar metal parts in the cylinder lock can be prevented, and the life of the cylinder lock can be greatly extended.

(2) It is possible to omit the burr removal processing of the tumbler or the case by barrel polishing or the like.

(3) It is possible to omit the plating treatment of the tumbler, the key cylinder or the case. As a result, the manufacturing process can be shortened and simplified, and the plating solution harmful to the human body becomes unnecessary.

(4) The surface of the tumbler is smoothed and the cylinder lock can be smoothly operated during use without lowering the locking strength required for the cylinder lock.

(5) Since the plating process is not required, it becomes possible to automate the entire manufacturing process of the cylinder lock.

(6) Even when the cylinder lock freezes in cold climates, the tumbler is covered with the electrically insulating resin, so the tumbler is frozen with a small force to insert the key into the cylinder lock, The cylinder lock can be unlocked or locked quickly.

(7) Since it is not necessary to apply a wet lubricant such as grease to the inside of the cylinder lock, the manufacturing process can be simplified and cleaned. Moreover, since no grease is used, dust or foreign matter does not adhere to the cylinder lock.

(8) Even if a part of the electrically insulating resin is peeled off from the surface of the tumbler and remains in the cylinder lock, the remaining resin has good lubricity, so that the cylinder lock must be operated for a long period of time. It becomes possible to carry out smoothly.

[Brief description of drawings]

FIG. 1 is a sectional view of a tumbler used in a cylinder lock according to the present invention.

FIG. 2 is an exploded perspective view of a cylinder lock according to the present invention.

FIG. 3 is a partial sectional view of a conventional tumbler.

FIG. 4 is a sectional view of a conventional cylinder lock.

[Explanation of symbols]

10- ・ Cylinder lock, 11- ・ Case, 12- ・ Key cylinder, 13- ・ Slot, 14- ・ Tumbler, 15- ・
・ Tumbler groove, 16 ・ ・ First main surface, 17 ・ ・ Second main surface, 18 ・ ・ Outer surface, 19 ・ ・ Inner surface, 20,21 ・ ・
Burr, 22 ... coating,

Claims (1)

[Claims] 1. A step of forming a key cylinder having a plurality of slots with a first metal, and an insulating resin on the surface of a tumbler material made of a second metal having a different ionization tendency from that of the first metal. Applying the coating to form a coating, pressing the tumbler material with the coating to form the tumbler, inserting the tumbler with the spring into the key cylinder slot, and placing the key cylinder in the case A process for producing a cylinder lock, comprising: