JP4844792B2 - Destruction prevention cylinder lock - Google Patents

Description

  The present invention relates to a cylinder lock that prevents unauthorized breakage in which a tumbler lock mechanism is not destroyed by drilling using a tool such as a drill or a hole saw, and the lock function is not lost.

  Conventionally, as a cylinder lock for buildings, a plurality of tumblers are projected into engagement grooves formed in the holder, making it impossible to rotate the cylinder inner, and inserting a key into the cylinder body Some of the holders can be unlocked or locked by making the holder rotatable.

  With this type of cylinder lock, the key can be used by inserting a tool or the like through the key hole and holding the tumblers one by one from the engagement groove while the cylinder inner is pivoted. The so-called picking which unlocks without any problem has been a problem, and the number of cylinder locks having a function of preventing this picking has been increasing in recent years.

  For this reason, there is an increasing number of techniques for breaking the cylinder lock with a tool such as a drill or a hole saw without using the above-mentioned picking, and as a means for preventing such unauthorized breakage, In addition, there is a type in which a high-hardness protective cover having an opening for inserting a key is fixed, or a hard ball or plate is inserted into a cylinder lock to prevent the cutting edge of the tool from entering.

Japanese Utility Model Publication No. 56-048845 Japanese Patent Laid-Open No. 02-164985

  The hardened steel that has been conventionally used as a high-hardness material used for the protective cover, balls, plates, etc. described above has a drawback that it is difficult to process parts and harden them and increases the cost. Further, there is a problem that the steel material is cut because it is inferior in hardness to a drill or a hole saw made of a cemented carbide depending on the hardness of quenching of the steel material, and cannot be taken as a sufficient countermeasure against destruction.

  For this reason, it is considered to use high-hardness ceramics as a harder material than the cemented carbide generally used for tools such as drills and hole saws. The plate or the like needs to be molded in accordance with the shape of the cylinder lock, and is expensive when used for these materials.

In order to solve the above-mentioned problems, the present invention provides, as a first invention, a holder to be mounted on a door body, a cylinder outer housed in the holder and provided with an engagement groove on an inner peripheral surface, and the cylinder outer body. A cylinder inner that is rotatably accommodated in the cylinder and has a key insertion hole, and is urged into the cylinder inner in a direction perpendicular to the key insertion direction, and protrudes from the cylinder inner in a state before the key is inserted. In the cylinder lock provided with a plurality of tumblers that engage with the engaging groove and are aligned by key insertion and immerse in the cylinder inner, and a cap that covers the front surface of the holder, the front surface of the holder includes: to form a plurality of accommodating recesses which are arranged radially on a circular arc having at least two different diameters centered on the key insertion hole, wherein A plurality of engaging recesses corresponding to the receiving recesses provided on the front surface of the holder are provided on the rear surface of the cap, and the receiving recesses of the holder and the engaging recesses of the cap are provided by attaching the cap to the front surface of the holder. A cylinder lock is proposed in which a small-sized ball of high hardness made of ceramics is held between the two.

As a second invention, in the cylinder lock of the first invention described above, a cylinder head having an opening for inserting a key and covering the front surface of the cylinder inner is provided. a plurality of accommodating recesses which are arranged radially on a circular arc which is formed around the opening is formed, it proposes a cylinder lock, characterized in that to accommodate a small diameter ball with high hardness made of each ceramic to the housing recess To do.

As a third invention , in the cylinder lock of the above-described second invention , a plurality of engaging recesses corresponding to the receiving recesses of the cylinder head are provided on the front surface of the cylinder inner, and the cylinder is mounted on the front surface of the cylinder inner. by attaching the head, between the accommodating recess and the cylinder inner engagement recess of the cylinder head, it proposes a cylinder lock characterized by containing a small ball of the high hardness so as to sandwich.

As a fourth invention, in any of the cylinder locks described in the first to third inventions, the high-hardness small-diameter ball is a ceramic ball used for barrel polishing. A cylinder lock is proposed.

  As is clear from the above description, according to the present invention, by disposing a plurality of high-hardness ceramic balls radially on the front surface of the cylinder lock, even when trying to cut with various drills or hole saws with different diameters, Since any part of the blade of a tool such as a drill or a hole saw comes into contact with the ball and the blade is damaged, cutting breakage can be effectively prevented. In addition, since the ball can have a small diameter, the structure of the cylinder lock is not restricted, and the design is simplified and the manufacturing cost is reduced.

  In addition, since a high-hardness ceramic ball is disposed on the rear surface of the cylinder head that covers the front surface of the cylinder inner, it is possible to prevent the cylinder lock from being broken by drilling the key insertion hole with a tool such as a drill.

  Further, by sandwiching the ball between the housing recess and the engagement recess, even when the cap or cylinder head is cut by a tool such as a drill or a hole saw, the ball does not peel from the holder or the cylinder lock, and the cap or Since the cylinder head is caught by the ceramic balls, the ceramic balls cannot be easily peeled off, the tool blade is damaged, and the cylinder lock can be protected from unauthorized destruction.

  In addition, since the ceramic ball | bowl can be diverted what was generally used for barrel grinding | polishing, a special process is not required and it becomes a manufacturing cost reduction.

  On the other hand, by fixing the ball to the receiving recess by an adhesive or caulking, it is possible to prevent the ball from easily falling off the cylinder lock even when the cap or the cylinder head is peeled off.

  A preferred embodiment of a cylinder lock according to the present invention will be described below and described in detail with reference to the accompanying drawings. 1 is a front view of a cylinder lock according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1, and FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. It is.

  The cylinder lock 1 generally includes a holder 4, a cylinder outer 5 accommodated in the holder 4, a cylinder inner 6 provided rotatably inside the cylinder outer 5, and a cylinder head 7 provided on the front surface of the cylinder inner 6. And a cap 8 that covers the front surface of the holder 4, a cover 9 that covers the outer peripheral surface of the holder 4, and a collar 10. The collar 10 is attached so as to be movable in the axial direction, and when the cylinder lock 1 is attached to a door (not shown), it can be attached corresponding to the door thickness.

  The holder 4 is made of a metal material such as iron in a substantially cylindrical shape and carburized to increase the surface strength. The cylinder outer 5 is obtained by forming a metal material such as zinc or aluminum into a substantially cylindrical shape. The cylinder inner 6 is formed by cylindrically forming a metal material such as zinc or aluminum, and a key insertion hole 6a into which a user key (not shown) to be described later is inserted is formed. A plurality of tumblers 11 and side bars 12 are accommodated.

  The tumbler 11 has a plate shape and is composed of 10 sheets that respond to user keys. The tumbler 11 has a rectangular key hole 11a formed at the center, and engages with an engagement groove 5a formed on the inner surface of the cylinder outer 5 as shown in FIG. 2 when no user key is inserted. Match. On the other hand, a rectangular key insertion hole 7 a is formed in the axial center of the cylinder head 7.

  When the user key is not inserted into the cylinder lock 1, the side bar 12 is engaged with an engagement groove 5 b formed on the inner surface of the cylinder outer 5 as shown in FIG. 3. That is, the tumbler 11 and the side bar 12 are engaged with the engagement grooves 5a and 5b formed in the cylinder outer 5, thereby preventing unauthorized unlocking such as picking without using the user key. When inserted through the key insertion hole 7a, the tumbler 11 is aligned and immersed in the cylinder inner 6, and the side bar 12 is inserted into a notch (not shown) of the aligned tumbler 11 and immersed in the cylinder inner 6. Therefore, the cylinder inner 6 can be rotated relative to the cylinder outer 5.

  The guard plate 13 is formed by forming a metal material such as iron into a plate shape and increasing the surface strength by carburizing treatment, and is disposed between the cylinder inner 6 and the cylinder head 7. This is for drilling the key insertion holes 6a, 7a with a tool such as a small-diameter drill and destroying the cylinder lock 1 to prevent unauthorized unlocking, but because the hardness is inferior to cemented carbide, When a drill using a cemented carbide is used, the cylinder lock 1 is perforated and illegally destroyed. Therefore, as will be described later, the cylinder lock 1 can be prevented from being perforated by disposing a ceramic ball 14 having a hardness higher than that of the cemented carbide in the vicinity of the key insertion hole 7a.

  Here, in the cylinder lock 1 according to the first embodiment of the present invention, the ceramic ball 14 is made of a material having a hardness higher than that of a high hardness cemented carbide generally used for a blade of a tool such as a drill or a hole saw. A plurality of are arranged. Specifically, the housing recess 4a is formed on the front side of the holder 4, and the ceramic ball 14 is housed and fixed to the housing recess 4a with an adhesive, or the periphery of the housing recess 4a is fixed by caulking, and the cap 8 Covers the holder 4. Further, an accommodation recess 7b is formed on the rear surface of the cylinder head 7, and the ceramic balls 14 are accommodated in the same manner.

  As shown in FIG. 1, a plurality of ceramic balls 14 are arranged radially from the center of the cylinder lock 1 on the front side of the cylinder lock 1. By arranging in this way, it is possible to cope with cutting with a tool such as a carbide hole saw having a different diameter. The thickness of the hole saw blade is generally about 2 mm to 3 mm. For example, the interval between the diameters 1, 2 and 3 where the ceramic balls 14 shown in FIG. 1 are arranged is set to a range of 2 mm or less. In this case, any part of the hole saw blade comes into contact with the ceramic ball 14, and since the hardness of the ceramic ball 14 is higher than that of the cemented carbide, the hole of the hole saw is damaged and cutting cannot be performed.

Here, the ceramic ball 14 is a high-temperature sintered body mainly composed of zirconium oxide (ZrO ₂ ), and is mainly composed of zirconia ceramics having high hardness, high toughness and high wear resistance, and aluminum oxide (Al ₂ O ₃ ). Alumina ceramics with high hardness and excellent wear resistance and corrosion resistance, and silicon nitride ceramics with high hardness and excellent wear resistance and thermal shock resistance, mainly composed of silicon nitride (Si ₃ N ₄ ) It is preferable to form with high hardness ceramics.

  In the present invention, a ceramic ball 14 having a diameter of about 2 mm to 3 mm is used. However, even if such a small-diameter ceramic ball 14 is used, a plurality of ceramic balls 14 are arranged to provide a drill, a hole saw, or the like. Therefore, it is possible to make the receiving recesses 4a and 7b into a small space without the need to change the structure of the conventional cylinder lock. The design can be simplified and the manufacturing cost can be kept low.

  Further, the ceramic ball 14 is a small-sized ceramic ball 14 used for barrel polishing when performing surface treatment such as deburring, chamfering, and gloss polishing of metal products, and a commercially available inexpensive ball is used. Therefore, the manufacturing cost can be kept low.

  FIG. 4 is a cross-sectional view of the cylinder lock 1 according to the second embodiment of the present invention. In this second embodiment, an engaging recess 8a is formed in the cap 8 facing the receiving recess 4a of the holder 4, and the ceramic ball 14 is sandwiched between the receiving recess 4a and the engaging recess 8a. With this configuration, when the ceramic ball 14 is to be peeled off from the cylinder lock 1 with a tool such as a drill or a hole saw, the cap 8 around the ceramic ball 14 must be broken and peeled off. The result is that the blade of a tool such as a hole saw abuts against the ceramic ball 14 and the destruction work does not progress, and the blade is damaged first because the ceramic ball 14 is harder than the tool blade of the hole saw or the like as described above. Become.

  In the cylinder lock 1 according to the second embodiment, the cylinder inner 6 and the cylinder head 7 are disposed adjacent to each other without using the guard plate 13. Therefore, since the engaging recess 6b is formed in the cylinder inner 6 facing the receiving recess 7b of the cylinder head 7 and the ceramic ball 14 is sandwiched between the receiving recess 7b and the engaging recess 6b, the cylinder head 7 is destroyed. Even when the ceramic ball 14 is to be peeled off from the cylinder lock 1, the blade is first damaged because the hardness of the ceramic ball 14 is higher than the blade of a tool such as a hole saw as in the above-described configuration.

  FIG. 5 is a sectional view of the cylinder lock 1 according to the third embodiment of the present invention. In this third embodiment, the ceramic ball 14 is sandwiched between the housing recess 4a of the holder 4 and the engagement recess 8a of the cap 8 as in the second embodiment, and the housing recess 7b of the cylinder head 7 is also held. And the engaging recess 6 b of the cylinder inner 6. Here, in order to prevent the trick of unlocking the cylinder lock 1 by piercing the key insertion holes 6a and 7a with a tool such as a drill having a high hardness and a small diameter using a cemented carbide, the ceramic balls 14 are By disposing also in the vicinity of the key insertion hole 7a, the penetration of a tool such as a drill can be effectively prevented.

  Although the embodiments have been described above, the present invention is not limited only to the embodiments described above, and various modifications can be made to the components within the scope described in the claims.

  For example, the cylinder lock 1 to which the present invention is applied is not limited to the arrangement of the ceramic balls 14 as shown in FIG. 1, and a plurality of ceramic balls 14 are arranged radially from the center, such as drills or hole saws having different diameters. As long as it corresponds to a tool, for example, as shown in FIGS. 6A and 6B, the number and diameter of the ceramic balls 14 may be freely arranged.

  In the embodiment of the present invention, materials of zirconia ceramics, alumina ceramics, and silicon nitride ceramics are enumerated as the ceramic balls 14, but are not limited thereto.

  Furthermore, in the embodiment of the present invention, the method of fixing the ceramic ball 14 by using an adhesive or caulking has been proposed. However, the present invention is not limited to this, and the method of fixing the ceramic ball 14 is easy and difficult to peel off. That's fine.

It is a front view of a cylinder lock concerning a first embodiment of the present invention. It is sectional drawing along the 2-2 line of the cylinder lock shown in FIG. FIG. 3 is a cross-sectional view taken along line 3-3 of the cylinder lock shown in FIG. It is sectional drawing of the cylinder lock which concerns on 2nd embodiment of this invention. It is sectional drawing of the cylinder lock which concerns on 3rd embodiment of this invention. 6 (a) and 6 (b) are application examples of the cylinder lock according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder lock 4 Holder 4a Receiving recessed part 5 Cylinder outer 5a Engaging groove 6 Cylinder inner 6a Key insertion hole 6b Receiving recessed part 7 Cylinder head 7a Key insertion hole 7b Receiving recessed part 8 Cap 8a Receiving recessed part 11 Tumbler 13 Guard plate 14 Ceramic ball

Claims (4)

A holder mounted on the door body, a cylinder outer housed in the holder and provided with an engagement groove on an inner peripheral surface, a cylinder inner housed rotatably in the cylinder outer body and having a key insertion hole; The cylinder is biased in the direction perpendicular to the key insertion direction into the cylinder inner, protrudes from the cylinder inner and engages with the engagement groove in a state before the key is inserted, and is aligned by the key insertion and the cylinder In a cylinder lock comprising a plurality of tumblers immersing in the inner and a cap covering the front surface of the holder,
A plurality of receiving recesses arranged radially on an arc having at least two different diameters centered on the key insertion hole are formed on the front surface of the holder, and provided on the rear surface of the cap on the front surface of the holder. By providing a plurality of engaging recesses corresponding to the received receiving recesses and attaching the cap to the front surface of the holder, a high height made of ceramic is provided between the receiving recess of the holder and the engaging recess of the cap. A cylinder lock characterized by containing a small-diameter ball having hardness .   A cylinder head having an opening for inserting a key and covering the front surface of the cylinder inner is provided, and a plurality of radially arranged arcs formed around the opening are formed on the rear surface of the cylinder head. 2. The cylinder lock according to claim 1, wherein a housing recess is formed, and a high-hardness small-diameter ball made of ceramics is housed in the housing recess. A plurality of engagements corresponding to the receiving recesses of the cylinder head on the front surface of the cylinder inner A fitting recess is provided, and the cylinder head is attached to the front surface of the cylinder inner, so that the high-hardness small-diameter ball is held between the receiving recess of the cylinder head and the engagement recess of the cylinder inner. The cylinder lock according to claim 2, wherein the cylinder lock is provided. The cylinder lock according to any one of claims 1 to 3, wherein the high-hardness small-diameter ball is a ceramic ball used for barrel polishing.

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