JP2009024459A - Lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock (specifically a pad lock) which is suitably available in a production facility of products (such as batteries, semiconductor devices, etc.) vulnerable to metallic powder, or areas near the facility, and prevented from generation of the metallic powder. <P>SOLUTION: The pad lock 1 is formed of a shackle member 10 having latch receptacles 16, 17 formed at both ends thereof, and a lock body 20 having socket holes 24, 26 into/from which the ends of the shackle member 10 are insertable/retractable. By inserting the ends of the shackle member 10 into the socket holes 24, 26 to engage latch members 38, 39 with the latch receptacles 16, 17, respectively, the pad lock is set, whereas by releasing the engagement, the shackle member 10 moves in a direction that retracts from the socket holes 24, 26 to release the pad lock. Herein, the shackle member 10 is made of a metallic material, and a member forming at least the socket holes 24, 26 of the lock body 20 is made of a non-metallic material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lock (typically a padlock) in which the generation of metal powder is prevented.

  When manufacturing precision parts such as batteries such as lithium secondary batteries and semiconductor devices, if fine metal powder (metallic dust) is present in the manufacturing environment, the quality deteriorates due to adhesion of the metal powder or mixing into the product. Inconvenience such as an increase in the defect rate may occur (see Patent Document 1). For example, when a product manufacturing facility (such as a clean room) that dislikes metal powder or an article used in the vicinity thereof has a metal part, the metal part can be a source of the metal powder. In particular, in the case of an article having a sliding part, when a metal part is used for the sliding part (movable part), the metal part is easily scraped and scraped to easily generate metal powder.

By the way, it is conceivable to use a convenient and convenient padlock as a lock or a mark for the door of the storage, the door of the control plate, the operation switch of the manufacturing apparatus or its safety device, or the like. However, in general, the padlock as a whole is made of metal, and therefore, metal parts can be slid (rubbed) when locking or unlocking to generate metal powder. Also, when inserting and removing the key into the keyhole of the padlock, metal powder can be generated by rubbing the key and the keyhole constituent member. It would be useful if a padlock provided with such metal powder generation prevention measures was provided.
In addition, although the key made from a synthetic resin is described in patent document 2, and the key made from fine ceramics is described in patent document 3, these are not aimed at generation | occurrence | production prevention of metal powder, Further, the configuration of the lock into which the key is inserted is not considered.

JP 2003-36887 A Japanese Patent Laid-Open No. 2-88856 Japanese Utility Model Publication No. 61-8259

  Accordingly, the present invention provides a lock (typically a padlock) that can be suitably used in manufacturing equipment for products that dislike metal powder (batteries, semiconductor devices, etc.) or in the vicinity thereof, and that prevents the generation of metal powder. For the purpose of provision.

According to the present invention, there is a lock (also referred to as a “lock”) including a shackle member having a latch receiver at an end portion and a lock body having a socket hole through which the end portion of the shackle member can be inserted and removed. The end of the shackle member is inserted into the socket hole and locked by engaging the latch member with the latch receiver, and by releasing the engagement, the shackle member moves in the direction of coming out of the socket hole and opens. A lock (typically a padlock) configured to lock is provided. Here, the shackle member is made of metal, and at least the member constituting the socket hole of the lock body is made of a non-metallic material.
In the lock having such a configuration, since the inner surface of the socket hole is made of a non-metallic material, even if the shackle member is made of metal, the shackle member can be inserted into and removed from the socket hole during locking and unlocking. Metals do not rub. This suppresses generation of metal powder due to sliding between the shackle member and the socket hole (lock body). Therefore, the lock according to the present invention can be used for various uses in various environments, and in particular, equipment for manufacturing products (non-aqueous electrolyte secondary batteries such as lithium secondary batteries, semiconductor devices, etc.) that dislike metal powders. Or it can use suitably also in the vicinity. Moreover, according to this lock, generation | occurrence | production of metal powder can be prevented, using a metal shackle member. By using a metal shackle member, it has superior strength and durability compared to a resin shackle member, and has impact resistance and formability (shape accuracy, ease of processing, etc.) compared to a ceramic shackle member. The advantage of superiority is obtained.

  In a preferred embodiment of the lock disclosed herein, the lock body has a keyhole, and at least the member constituting the keyhole of the lock body is made of a non-metallic material. In the lock having such a configuration, even when a metal key is used as a key used in combination with the lock (which constitutes a lock set), the metal is rubbed when the metal key is inserted into and removed from the key hole. There is nothing. Therefore, according to this aspect, it is possible to prevent generation of metal powder due to rubbing (sliding) between the key and the keyhole (keyhole constituent member) regardless of the material of the key.

In another preferable aspect of the lock disclosed herein, the lock body is disposed across a plug constituting the front keyhole, a sleeve into which the plug is fitted, and the plug and the sleeve. And a tumbler member for preventing rotation of the plug. The lock is configured such that when the key is inserted into the keyhole, the tumbler member slides relative to the plug and the sleeve to allow the plug to rotate. The tumbler member is made of metal, and at least the member constituting the sliding portion of the lock body with the tumbler member is made of a non-metallic material.
In the lock having such a configuration, since the sliding portion is made of a non-metallic material, even if the tumbler member is made of metal, the metal is rubbed even if the tumbler member moves relative to the plug and the sleeve. There is nothing. Therefore, according to the said structure, generation | occurrence | production of the metal powder by the rubbing (sliding) of a tumbler member is suppressed. Thus, according to the lock according to the present invention, generation of metal powder can be prevented while using a metal tumbler member. By using a metal tumbler member, it is superior in strength and durability compared to a resin tumbler member, and has impact resistance and formability (shape accuracy, ease of processing, etc.) compared to a ceramic tumbler member. The advantage of superiority is obtained.

  In another preferred embodiment, the surface of the tumbler member is covered with a hard non-metallic film. According to this aspect, even when a metal key is used as a key used in combination with the lock (which constitutes a lock set), when the key is inserted into and removed from the key hole, the metal and the tumbler constituting the key are removed. Direct contact with the constituent metal can be avoided. Therefore, regardless of the key material, generation of metal powder due to rubbing (sliding or the like) between the key and the tumbler member can be prevented.

In still another preferred aspect of the lock disclosed herein, the latch member is made of metal. In the sliding portion between the shackle member and the latch member when the latch member is engaged with the latch receiver and when the engagement is released, at least one surface of the shackle member and the latch member is hard. By being covered with the non-metallic film, direct contact between the metals constituting both members is avoided.
In this aspect, since the latch member (for example, the ball) is made of metal, it is superior in strength and durability compared to the resin latch member, and has impact resistance and formability (shape accuracy) compared to the ceramic latch member. , And ease of processing). Further, since at least one (preferably both) of the shackle member and the latch member is covered with a hard non-metallic film, direct contact between metals constituting both members is avoided, so that the metal shackle member and Generation of metal powder can be prevented while using a metal latch member. When the shackle member and the latch member are engaged and when the engagement is released, a large stress is applied to the sliding portions of both members. Therefore, if one or both of these members are made of resin, the durability of the lock is increased. However, according to the present invention, it is possible to realize a lock with excellent durability and prevention of metal powder.

  A preferred example of the non-metallic film is a diamond-like carbon film. A diamond-like carbon film (hereinafter also referred to as “DLC film”) has high hardness and chemical stability and is excellent in wear resistance. High durability. Therefore, according to such a configuration, it is possible to realize a lock with excellent durability for suppressing the generation of metal powder.

As another aspect, the present invention provides, as another aspect, a lock set including any lock disclosed herein (typically a padlock) and a key capable of unlocking the lock (synonymous with the lock) (that is, Key and lock set). Since the lock set uses a lock with measures for preventing the generation of metal powder as described above, it can be suitably used in manufacturing equipment for products (batteries, semiconductor devices, etc.) that dislike metal powder or in the vicinity thereof. it can.
In a preferred aspect of the lock set disclosed herein, the key is made of metal, and the lock body constituting the lock has a key hole having at least an inner surface made of a non-metallic material. According to such a lock set, generation of metal powder can be prevented while using a metal key. By using a metal key as described above, there are advantages that it is superior in strength and durability as compared to a resin key, and superior in impact resistance and formability compared to a ceramic key.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that matters other than matters specifically mentioned in the present specification and necessary for the implementation of the present invention can be grasped as design matters of those skilled in the art based on the prior art in this field. The present invention can be carried out based on the contents disclosed in this specification and common technical knowledge in the field.

  As shown in FIG. 1, a padlock 1 as a typical example of a lock disclosed herein includes an inverted J-shaped shackle member 10 having a long leg portion 12 and a short leg portion 14, and the leg portions 12, 14. And a lock body 20 having socket holes 24 and 26 into which the end portions are respectively inserted. The lock body 20 is provided with a key hole 42 through which the key 90 can be inserted and removed. The lock set 100 includes a padlock 1 and a key 90 that can be used in combination with the padlock (which can unlock the padlock 1).

  In the end portions of the long leg portion 12 and the short leg portion 14 of the shackle member 10, recesses 16 and 17 are formed in the inner portions facing each other. In the locked state of the padlock 1 shown in FIG. 1, balls 38 as latch members housed in the lock body 20 are inserted into the recesses 16 and 17 of the long leg portion 12 and the short leg portion 14 inserted into the socket holes 24 and 26. 39 is engaged. As a result, the shackle member 10 is prevented from moving in a direction (upward in FIG. 1) to be removed from the socket holes 24 and 26. A spring 19 that urges the shackle member 10 upward is housed in the back of the socket hole 24.

  The lock body 20 includes a case 22 that is a member constituting the socket holes 24, 26, a cylindrical sleeve 30 that is fitted and fixed in the case 22, and a member that constitutes the key hole 42, on the inner peripheral side of the sleeve 30. And a stepped columnar plug 40 fitted therein. In the locked state shown in FIG. 1, three (three sets) pin tumblers 50 are located across the sleeve 30 and the plug 40. Further, the head 46 provided on the back side of the plug 40 (the side opposite to the entrance of the keyhole 42) moves the ball 38 to the inner peripheral side in the locked state shown in FIG. Is disengaged).

  The configuration and operation of the pin tumbler 50 will be described. As shown in FIGS. 2 and 3, the sleeve 30 has sliding holes 33, 34 extending from the outer peripheral end of the sleeve 30 radially inward to the inner peripheral end in order from the lower side (the inlet side of the keyhole 42). , 35 are formed. The plug 40 has sliding holes 43, 44, 45 extending radially inward from the outer peripheral end of the plug 40 and reaching the key hole 42, respectively, at positions corresponding to the sliding holes 33, 34, 35 of the sleeve 30. Is formed. A communication hole formed by the sliding hole 33 and the sliding hole 43, a communication hole formed by the sliding hole 34 and the sliding hole 44, and a sliding hole 35 and the sliding hole 45 are formed. The pin tumblers 50 are accommodated in the respective communication holes.

  The pin tumbler 50 includes an inner pin 52 disposed on the inner side (key hole 42 side) and an outer pin 54 that abuts on the outer end thereof. The pin tumbler 50 is disposed on the inner side (key hole 42 side) by a spring 56 disposed on the outer side of the outer pin 54. ). In a state where the key 90 is not inserted into the key hole 42, the pin tumbler 50 is located at a position where the tip of the inner pin 52 abuts against the inner surface of the key hole 42, like the pin tumbler 50 shown at the top in FIG. is there. At this time, the tip of the outer pin 54 has entered into the sliding hole 43 (that is, the outer pin 54 is disposed across the sleeve 30 and the plug 40), thereby preventing the plug 40 from rotating with respect to the sleeve 30. ing. The pin tumbler 50 can be moved outward along the sliding holes 33, 43, the sliding holes 34, 44 and the sliding holes 35, 45 by being pushed outward against the urging force of the spring 56. it can. As described above, in the present embodiment, the sleeve 30 and the plug 40 correspond to members constituting a sliding portion between the lock body 20 and the pin tumbler 50.

Here, among the components of the padlock 1, the shackle member 10, the balls 38 and 39, the inner pin 52, and the outer pin 54 are all made of metal. As a metal material constituting these metal members, stainless steel, aluminum (alloy), magnesium (alloy), titanium (alloy), or the like can be used. Stainless steel is exemplified as a preferred metal material for the present invention, and among these, austenitic stainless steel (for example, 300-series SUS such as SUS304) is preferably used. Such stainless steel is usually a non-magnetic material, but has a property of becoming a magnetic material by applying a strong magnetic field. For this reason, even if metal powder is generated from these members and mixed into the battery etc. (for example, due to inappropriate usage, etc.), it is easy to remove the metal powder using the above properties. The adverse effect of is small. For example, the shackle member 10 may be configured using SUS303, and the balls 38 and 29, the inner pin 52, and the outer pin 54 may be configured using SUS304.
These metal members, that is, the shackle member 10, the balls 38 and 39, the inner pin 52, and the outer pin 54 are all covered with a DLC film. The formation of the DLC film (that is, the process of covering the surface of the metal member with the DLC film) can be performed by a conventionally known method, and the specific method for forming the DLC film itself characterizes the present invention. Therefore, detailed description is omitted.

  Of the components of the padlock 1, the case 22, the sleeve 30 and the plug 40 are all made of resin. Examples of resin materials constituting these resin parts include polyphenylene sulfide (PPS), polyphenylene ether (PPE), melamine resin, polycarbonate (PC), polyethersulfone (PES), polysulfone (PSF), polyetherimide, Polyimide, polyamide, polyamideimide (PAI), acrylonitrile-styrene resin (AS resin), polypropylene (PP), polyethylene (PE), polymethylpentene (PMP), polyarylate (PAR), polyetheretherketone (PEEK), A resin such as polyether ketone (PEK) can be selected. It is preferable to use a resin material having high self-lubricating properties and high mechanical strength. For example, PPS, PEEK, PC, etc. can be preferably used. PPS is exemplified as a particularly preferable resin material for the present invention.

  On the other hand, the key 90 includes an insertion portion 92 that is inserted into the keyhole 42, and a grip portion 96 that is formed following the insertion portion 92. In the insertion portion 92, recesses 93, 94, and 95 that can receive the tips of the inner pins 52 of the three pin tumblers 50 are formed in this order from the tip 91 side of the key 90. The key 90 is made of metal (for example, made of SUS304), and the entire surface thereof is covered with a DLC film.

  The operation at the time of unlocking the padlock 1 configured as described above will be described. That is, when the insertion portion 92 of the key 90 is inserted into the key hole 42, the tip 91 of the key 90 hits the inner pin 52, and moves the pin tumbler 50 to the outer peripheral side against the urging force of the spring 56. When the tip of the inner pin 52 is in contact with the insertion portion 92 other than the recesses 93, 94, 95, like a pin tumbler 50 shown second from the entrance side of the keyhole 42 in FIG. The outer end of the inner pin 52 extends into the sliding hole 34 of the sleeve 30 (that is, the inner pin 52 is disposed across the sleeve 30 and the plug 40), and the rotation of the plug 40 relative to the sleeve 30 is impeded. ing. Here, as described above, the inner pin 52 and the surface of the key 90 are both covered with the DLC film, thereby avoiding direct contact between the metal constituting both members. No metal powder is generated by sliding with 90. Further, the sliding holes 33 to 35 and 43 to 45 for guiding the inner pin 52 and the outer pin 54 are constituted by a resin sleeve 30 and a resin plug 40. Therefore, generation of metal powder due to sliding between the sliding holes 33 to 35 and 43 to 45 and the inner pin 52 and the outer pin 54 can be prevented. Further, since the plug 40 constituting the key hole 42 is made of resin, generation of metal powder due to the key 90 and the key hole 42 being rubbed when the key 90 is inserted and removed is also prevented.

  As shown in FIG. 3, when the key 90 is inserted into the keyhole 42 (until the tip 91 reaches the bottom of the keyhole 42), the tips of the three inner pins 52 fit into the recesses 93, 94, and 95 of the key 90, respectively. . At this time, the depths of the recesses 93, 94, and 95 are set so that the boundary (shear line) between the inner pin 52 and the outer pin 54 of each pin tumbler 50 coincides with the boundary between the sleeve 30 and the plug 40. Yes. Accordingly, the plug 40 can be rotated with respect to the sleeve 30 and the case 22 fixed thereto.

  When the plug 40 is rotated by twisting the key 90, as shown in FIG. 4, the balls 38 and 39 are retracted to the inner peripheral side by the recesses 48 and 49 provided on the outer periphery of the head 46 of the plug 40. Thus, when the engagement between the balls 38 and 39 and the shackle member 10 (the recesses 16 and 17) is released, the shackle member 10 is moved to a position where the ball 38 is engaged with the constriction 18 formed near the tip of the long leg portion 12. Is pushed up by the urging force of the spring 19, whereby the tip of the short leg portion 14 comes out of the socket hole 26. Here, as described above, the surfaces of the balls 38 and 39 and the shackle member 10 are all covered with the DLC film, and the direct contact of the metal constituting these members is avoided. Therefore, metal powder is not generated by rubbing the balls 38 and 39 and the shackle member 10. Further, since the head portion 46 and the case 22 of the plug 40 are made of resin, generation of metal powder due to rubbing the balls 38 and 39 and the plug 40 and the case 22 can be prevented. Furthermore, since the case 22 is made of resin, generation of metal powder due to rubbing between the shackle member 10 and the case 22 is prevented.

  Thus, the padlock 1 according to this embodiment and the lock set 100 using the padlock 1 are excellent in durability against repeated unlocking and locking. In addition, the padlock 1 and the lock set 100 are highly prevented from generating metal powder with use (for example, generation of metal powder due to unlocking operation or locking operation), and the effect of preventing the generation of the metal powder. High durability. Therefore, it is particularly suitable as a padlock and lock set used in the manufacturing equipment (clean room, etc.) for products that dislike metal powder or in the vicinity thereof.

As mentioned above, although this invention was demonstrated in detail, the said embodiment and Example are only illustrations and what changed and changed the above-mentioned specific example is contained in the invention disclosed here.
For example, as the member constituting the socket hole and the member constituting the sliding portion between the lock body and the tumbler member, resin members (case 22, sleeve 30 and plug 40) are used in the above description. May be made of ceramic (for example, made of ceramic such as alumina, zirconia, silicon nitride, silicon carbide). In the above description, a member having a DLC film formed on the entire surface of a metal member is used as a shackle member, a latch member (balls 38 and 39) and a tumbler member (inner pin 52 and outer pin 54). Instead of the film, a metal member on which another hard nonmetallic film (for example, an alumina film) is formed may be used.

In addition, the technical idea of the present invention is not limited to locks such as padlocks, but also to manufacturing equipment for products that have sliding parts and dislike metal powder or other items used in the vicinity thereof, such as hinges. Applicable.
That is, in the technique disclosed in this specification, for example, as shown in FIG. 5, two metal blades (62, 64) and one end of the blades (62, 64) are provided. The blades (62, 64) are connected to the tubular parts (62a, 64a) in common, and the blades (62, 64) are rotatably supported around the tubular parts (62a, 64a). And a hinge (60) having a pin (66) that slides on the end faces of the tubular portions (62a, 64a) of the two blades (62, 64). One (preferably both) end surfaces of the tubular portion of the blades are covered with a hard non-metal film (preferably a DLC film, an alumina film, etc., particularly preferably a DLC film). ) To avoid direct contact between the metals It included're hinge 60. Reference numeral 69 in FIG. 5 is an attachment hole used for fixing the hinge 60. According to such a configuration, generation of metal powder due to rubbing of the tubular portions (62a, 64a) of the two blades (62, 64) at the sliding portion (65) can be prevented. Moreover, since these blades (62, 64) are made of metal, they are superior in strength and durability as compared to a hinge configured using, for example, a resin blade. Furthermore, it is good also as a structure by which the outer peripheral surface of the blade board inner surface (61) and / or the said tubular part which opposes the outer periphery of the tubular part (62a, 64a) of the other blade board was covered with the hard nonmetallic film.
In a preferred embodiment of the hinge (60), the pin (66) is made of metal, and the outer periphery of the pin (66) is a hard non-metallic film (preferably a DLC film, an alumina film, etc., particularly preferably DLC). In this case, direct contact between the metal constituting the pin (66) and the metal constituting the two blades (62, 64) is avoided. According to such a structure, generation | occurrence | production of the metal powder by rubbing a pin (66) and a blade board (62, 64) can also be prevented. Since the said pin (66) is metal, it is excellent in intensity | strength and durability compared with the hinge comprised, for example using a resin-made pin.

In the technique disclosed in this specification, as shown in FIG. 6, for example, two metal blades (72, 74) and one end of the blades (72, 74) are provided. The blades (72, 74) are connected to the tubular portions (72a, 74a) in common and connect the blade plates (72, 74), and the blade plates (72, 74) are rotatably supported around the tubular portions (72a, 74a). A hinge ring (70) having a pin (76) to be operated, and a spacer ring (78) made of resin (for example, made of PPS) commonly inserted through the pin (76) is connected to the two blade plates (72). , 74) includes a hinge (70) interposed between end faces of the tubular portions (72a, 74a). In addition, the code | symbol 79 in FIG. 6 is an attachment hole utilized for fixation of this hinge 70. FIG. According to such a configuration, the spacer ring (78) is interposed between the end faces of the tubular portions (72a, 74a) of the two blade plates (72, 74), so that the metal powder caused by the rubbing of the end faces can be prevented. Occurrence is avoided. Preferably, the pin (76) is made of resin. This can also prevent generation of metal powder due to rubbing between the pin (76) and the blades (72, 74).
In the hinge (70), as in the example shown in FIG. 6, the thickness of the spacer ring (78) is made larger than the thickness of the tubular portion (72a, 74a). It is good also as a structure which the blade blade inner end surface (71) facing the outer periphery of a part (72a, 74a) and this tubular part outer periphery are spaced apart. According to this configuration, generation of metal powder due to rubbing between the outer periphery of the tubular portions (72a, 74a) and the inner end surface (71) can be avoided.

  The lock according to the present invention (typically a padlock) and a lock set using the lock are configured using metal parts, or when unlocking and locking using a metal key. However, the generation of metal powder associated with the use of the lock is prevented. Therefore, it can be used for various applications in various environments, and in particular, used in or near the manufacturing facility for products that dislike metal powder (for example, batteries such as lithium secondary batteries and precision parts such as semiconductor devices). It is particularly suitable as a lock and lock set. For example, in the present invention, as an entrance door of a facility for manufacturing the product, a door of a storage box inside or near the facility, a door of a control plate, a lock or a mark such as an operation switch of a manufacturing apparatus or its safety device. Such locks or lock sets can be preferably employed.

It is sectional drawing which shows the lock state of the lock (padlock) which concerns on one embodiment. It is sectional drawing which shows the action | operation of the principal part of the lock | rock (padlock) which concerns on one embodiment. It is sectional drawing which shows the action | operation of the principal part of the lock | rock (padlock) which concerns on one embodiment. It is sectional drawing which shows the unlocking state of the lock (padlock) which concerns on one embodiment. It is a top view which shows an example of the hinge in which generation | occurrence | production of the metal powder was prevented. It is a top view which shows the other example of the hinge in which generation | occurrence | production of the metal powder was prevented.

Explanation of symbols

1 Padlock (lock)
10 Shackle member 16, 17 Recess (latch receiver)
20 lock body 22 case (case)
24, 26 Socket hole 30 Sleeve 33, 34, 35 Sliding hole 38, 39 Ball (latch member)
40 Plug 42 Key hole 43, 44, 45 Sliding hole 46 Head 50 Pin tumbler 52 Inner pin (tumbler member)
54 Outer pin (tumbler member)
90 Key 100 Lock set 60, 70 Hinge 62, 64 Blade 62a, 64a, 72a, 74a Tubular part 65 Sliding part 66, 76 Pin 78 Spacer ring

Claims (6)

A shackle member having a latch receiver formed at an end thereof, and a lock body having a socket hole through which the end portion of the shackle member can be inserted and removed, the end of the shackle member being inserted into the socket hole and A lock configured to lock by engaging a latch member, and to unlock the shackle member by moving in the direction of coming out of the socket hole by releasing the engagement,
The shackle member is made of metal, and at least the member constituting the socket hole of the lock body is made of a non-metallic material.   The lock according to claim 1, wherein the lock body has a keyhole, and at least a member constituting the keyhole is made of a non-metallic material. The lock body includes a plug that constitutes the key hole, a sleeve into which the plug is fitted, and a tumbler member that is disposed between the plug and the sleeve to prevent rotation of the plug, and the key hole The tumbler member is configured to slide with respect to the plug and the sleeve by inserting a key into the plug and to allow the plug to rotate,
The lock according to claim 2, wherein the tumbler member is made of metal, and at least a member of the lock body that forms a sliding portion with the tumbler member is made of a non-metallic material.   The lock according to claim 3, wherein a surface of the tumbler member is covered with a hard non-metallic film. The latch member is made of metal,
At the sliding portion between the shackle member and the latch member when the latch member is engaged with the latch receiver and when the engagement is released, at least one surface of the shackle member and the latch member is not hard. The lock according to any one of claims 1 to 4, wherein direct contact between metals constituting both members is avoided by being covered with a metal film.   The lock according to claim 4 or 5, wherein the non-metallic film is a diamond-like carbon film.

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