JP2013159907A - Cylinder lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder lock that can prevent problems of more complicated unlocking operation for door, worse outward appearances, deformation of a duplicate key, etc., from arising and has high protection against illegal unlocking acts at a low price without increasing the number of components.SOLUTION: There is provided a cylinder lock 1 including a rotatable plug 3 having a keyhole 22 and a key guide 8 provided rotatably in front of the plug 3 and having a key insertion hole 62 communicating with the keyhole 22. In the cylinder lock 1, while one of the plug 3 and key guide 8 is provided with a recessed part 68, the other of the plug 3 and key guide 8 is provided with a projection part 29 fitted in the recessed part 68 to restrict relative rotation of the key guide 8 to the plug 3, and when the key guide 8 is rotated with certain torque or larger torque, the projection part 29 is broken with force acting on a fitting part between the recessed part 68 and projection part 29, so that the key guide 8 becomes able to rotate relatively to the plug 3.

Description

  The present invention relates to a cylinder lock.

  Conventionally, a cylinder lock is attached to a door or the like installed outdoors. This cylinder lock is equipped with a rotatable plug having a key hole. When the plug rotates with the key inserted in the key hole, this rotation is transmitted to the locking / unlocking mechanism so that the door is locked / unlocked. It has become.

  In recent years, for example, in a cylinder lock attached to a door of a vending machine, an action of breaking a plug by using a cutting means such as a drill or a hole saw and unlocking the door illegally has been performed. In order to cope with such an unauthorized unlocking action, a configuration in which the front side of the plug is protected with a key guide is known. The key guide has a key insertion hole at a position corresponding to the key hole of the plug, and a key can be inserted into the key hole of the plug through the key insertion hole. The key guide is rotatable with respect to the plug, and when torque from the cutting means is transmitted to the key guide, the key guide idles to prevent cutting and protect the plug. ing.

  However, if the key guide can always rotate with respect to the plug, the position of the key insertion hole of the key guide and the position of the key hole of the plug will not match. For this reason, when trying to unlock the door using a key, the position of the key hole of the plug must be searched with the tip of the key slightly inserted into the key insertion hole of the key guide. Becomes complicated. Further, while searching for the position of the key hole of the plug, there is a possibility that the surface of the key guide may be damaged by the tip of the key and the appearance of the cylinder lock may be damaged, or the tip of the key may be deformed.

  In order to prevent these problems, the cylinder lock described in Patent Documents 1 and 2 connects the key guide (see “Protective Cap 15” in Patent Document 1 and “Reinforcing Member 8” in Patent Document 2) and the plug. Only when the pins are connected and normally rotated integrally and cutting with a drill or the like is performed, the connecting pins are cut or broken, and the key guide rotates with respect to the plug.

JP-A-10-131560 JP 2008-88670 A

  However, in the prior art described in Patent Documents 1 and 2, the plug and the key guide are connected by a connecting pin separate from the plug and the key guide. Therefore, there is a possibility that the number of parts increases and the manufacturing cost increases.

  Moreover, in the prior arts described in Patent Documents 1 and 2, a connection pin is disposed in the vicinity of the key insertion hole of the key guide (see FIGS. 2 and 2 of Patent Documents 1 and 2). Therefore, when adopting a configuration in which the key insertion hole of the key guide is opened and closed by the shutter, there is a possibility that the connecting pin interferes with the shutter and the spring for urging the shutter.

  Furthermore, in the prior arts described in Patent Documents 1 and 2, the plug and the key guide are both connected by only one connecting pin. Therefore, it is difficult to stably assemble the key guide to the plug.

  In view of the above circumstances, the present invention provides a cylinder lock that can prevent troubles such as complicated door unlocking operation, deterioration in appearance, deformation of the key, and the like, and has high protection against unauthorized unlocking. It is an object to provide a low price without causing an increase in the number of parts.

  The cylinder lock according to the present invention includes a rotatable plug having a key hole, and a key having a key insertion hole that is provided rotatably on the near side of the plug in the key insertion direction of the key hole and communicates with the key hole. A cylinder lock provided with a guide, wherein one of the plug or the key guide is provided with a recess, and the other of the plug or the key guide is fitted with the recess and the plug with respect to the plug A protrusion for restricting the relative rotation of the key guide is provided, and when the key guide is rotated with a torque of a certain level or more, the protrusion breaks due to a force generated in a fitting portion between the recess and the protrusion, and the plug In contrast, the key guide is relatively rotatable.

  By adopting such a configuration, when the unlocking operation is being performed by the key, the relative rotation of the key guide with respect to the plug is restricted, and the position of the key hole of the plug and the key insertion hole of the key guide are controlled. The positions can be matched. This makes it easier to unlock the door, and damages the appearance of the cylinder lock by damaging the surface of the key guide with the tip of the key, or deforming the tip of the key. It becomes possible to prevent. Further, when the key guide is rotated with a torque exceeding a certain level by a cutting means such as a drill or a hole saw, the key guide is idled to prevent the plug from being cut, thereby protecting the plug.

  In addition, since the plug and the key guide are provided with a recess and a protrusion to suppress relative rotation of the key guide with respect to the plug, no additional parts are required. Therefore, the manufacturing cost can be reduced and the cylinder lock can be provided at a low price.

  In the cylinder lock according to the present invention, the key guide includes a guide body provided with the insertion hole for the key, and a spacer attached to an end of the guide body on the back side in the insertion direction, and the recess includes The protrusion may be provided on the outer periphery of the spacer, and the protrusion may be provided on the outer periphery of the end of the plug on the near side in the insertion direction.

  By providing the recesses and protrusions on the outer periphery of the spacer and the plug in this way, it is possible to place the recesses and protrusions at positions separated from the key insertion holes normally formed on the inner periphery of the guide body. Become. Therefore, for example, when adopting a configuration in which the key insertion hole is opened and closed by the shutter, it is possible to prevent the shutter and the spring for biasing the shutter from interfering with the concave portion and the protruding portion.

  In the cylinder lock according to the present invention, the recess and the protrusion may be provided at a plurality of positions with an interval of at least 90 degrees or more.

  By adopting such a configuration, the key guide can be stably assembled to the plug.

  According to the cylinder lock of the present invention, it is possible to prevent problems such as complicated door unlocking work, deterioration of appearance, deformation of the key, and the like, and a cylinder lock having high protection against illegal unlocking actions. Therefore, it can be provided at a low price without incurring an increase in the cost.

It is sectional drawing of the cylinder lock which concerns on one Embodiment of this invention. It is AA sectional drawing of FIG. It is a rear view of the cylinder lock concerning one embodiment of the present invention. In the cylinder lock concerning one embodiment of the present invention, it is a front view of the 1st plug piece. In the cylinder lock concerning one embodiment of the present invention, it is a rear view of a guide main part. In the cylinder lock concerning one embodiment of the present invention, it is a rear view of a spacer. It is BB sectional drawing of FIG. In the cylinder lock concerning one embodiment of the present invention, it is a sectional view showing the state where the key was inserted in the keyhole.

  Hereinafter, based on FIGS. 1-8, the cylinder lock which concerns on one Embodiment of this invention is demonstrated. FIG. 1 is a cross-sectional view of a cylinder lock according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a rear view of the cylinder lock according to the embodiment of the present invention. FIG. 4 is a front view of the first plug piece in the cylinder lock according to the embodiment of the present invention. FIG. 5 is a rear view of the guide body in the cylinder lock according to the embodiment of the present invention. FIG. 6 is a rear view of the spacer in the cylinder lock according to the embodiment of the present invention. 7 is a cross-sectional view taken along the line BB in FIG. FIG. 8 is a cross-sectional view showing a state in which the key is inserted into the key hole in the cylinder lock according to the embodiment of the present invention.

  Although the positional relationship of each part of the cylinder lock 1 varies depending on the installation angle of the cylinder lock 1, in the present embodiment, the left side, right side, back side, and front side in FIG. Front side (front side), back side (rear side), left side, and right side. In this embodiment, the front side of the cylinder lock 1 is the front side in the key insertion direction, and the rear side of the cylinder lock 1 is the back side in the key insertion direction.

  Since FIG. 2 is a sectional view from the lower side, the upper side on the drawing is the actual right side, and the lower side on the drawing is the actual left side. 3, 5, and 6 are rear views, and FIG. 7 is a cross-sectional view from the rear side. Therefore, the left-right relationship on the drawings in FIGS. 3 and 5 to 7 and the actual left-right relationship are reversed. Yes.

  Hereinafter, for each member, a portion near the center axis of the cylinder lock 1 (see line AA in FIG. 1) is referred to as “inner side (or inner circumference)”, and a portion away from the center axis of the cylinder lock 1 is referred to as “outside” (Or outer periphery) ".

  The cylinder lock 1 is attached to a door of a vending machine installed outdoors, for example, together with a handle lock (not shown), which will be described later, and constitutes a lock. As best shown in FIG. 2, the cylinder lock 1 includes a cylindrical outer cylinder 2, a plug 3 attached to the inner periphery of the outer cylinder 2, and a left side (lower side in FIG. 2) of the plug 3. The lock bar 4 is disposed, the tail piece 5 disposed on the rear side of the plug 3, the clutch mechanism 6 disposed between the plug 3 and the tail piece 5, and the outer periphery of the front portion of the outer cylinder 2. The decorative ring 7 and the key guide 8 mounted on the front inner periphery of the decorative ring 7 are mainly configured. Hereinafter, these members will be described in order.

As shown in FIGS. 1 and 2, an annular protrusion 10 is provided on the outer periphery of the front portion of the outer cylinder 2, and an annular decorative ring mounting portion 11 is formed in front of the annular protrusion 10. A retaining ring mounting recess 12 is provided in the decorative ring mounting portion 11, and a retaining ring 13 is mounted in the retaining ring mounting recess 12 with the outer portion protruding. A plug mounting portion 14 is formed in the inner space of the outer cylinder 2 from the front end portion to the rear portion. As shown in FIG. 2, a lock bar insertion groove 15 is provided at the left end (lower end in FIG. 2) of the plug mounting portion 14.

  As shown in FIGS. 1 and 2, the outer cylinder 2 is formed with a tailpiece mounting portion 16 having a smaller diameter than the plug mounting portion 14 behind the plug mounting portion 14. A communication hole 17 having a smaller diameter than the tailpiece mounting portion 16 is formed in the outer cylinder 2 behind the tailpiece mounting portion 16, and the tailpiece mounting portion 16 and the outer cylinder 2 are connected to each other through the communication hole 17. The space behind is in communication. As shown in FIG. 3, the communication hole 17 has a substantially circular shape when viewed from the back. On the outer periphery of the communication hole 17, a rotation restricting groove 18 is formed on the left side (right side in FIG. 3). Fitting grooves 19 are formed in the upper and lower portions of the outer periphery of the communication hole 17, respectively.

  As shown in FIG. 2, the plug 3 is rotatably mounted on the plug mounting portion 14 of the outer cylinder 2. The plug 3 includes a first plug piece 20 and a second plug piece 21 disposed on the left side (lower side in FIG. 2) of the first plug piece 20.

  The first plug piece 20 has a long shape in the front-rear direction. A keyhole 22 is formed in the front-rear direction on the inner periphery of the first plug piece 20. A plurality of first engagement grooves 23 communicating with the key holes 22 are provided on the inner peripheral portion of the first plug piece 20 at a predetermined interval on the front and rear sides. A first tumbler 24 is engaged with each first engagement groove 23, and an insertion hole 25 is formed in each first tumbler 24 at a position corresponding to the key hole 22. Each first tumbler 24 is provided with a first tooth row portion (not shown).

  As shown in FIG. 1 and FIG. 2, a longitudinally rectangular parallelepiped clutch piece insertion groove 26 communicating with the key hole 22 is provided on the rear surface of the first plug piece 20. As shown in FIG. 2, a second plug piece mounting portion 27 is provided on the left side of the first plug piece 20 (lower part in FIG. 2).

  As shown in FIG. 4, an annular pedestal 28 is provided on the front surface of the first plug piece 20 so as to surround the opening of the key hole 22. On the left side and the lower part of the front surface of the pedestal portion 28, a quadrangular columnar projection portion 29 is projected forward. Each protrusion 29 is provided at two positions with an interval of 90 degrees.

  As shown in FIG. 2, the second plug piece 21 has a shape that is long in the front-rear direction, and is attached to the second plug piece attachment portion 27 of the first plug piece 20. A lock bar insertion groove 30 is provided on the outer peripheral portion of the second plug piece 21. Spring mounting recesses 31 are respectively formed at the front end portion and the rear end portion of the lock bar insertion groove 30. A plurality of second engagement grooves 32 are provided on the inner peripheral portion of the second plug piece 21 at a predetermined interval in the front and rear, and a second tumbler 33 is engaged with each second engagement groove 32. ing. A lock bar engagement groove 34 is formed in the left side of each second tumbler 33 (lower part in FIG. 2). Each second tumbler 33 is provided with a second tooth row portion (not shown), and this second tooth row portion meshes with a first tooth row portion (not shown) of each first tumbler 24, The first tumbler 24 and the second tumbler 33 are connected to slide integrally in a direction perpendicular to the axial direction of the cylinder lock 1 (the front-rear direction in this embodiment).

  The lock bar 4 has a long shape in the front-rear direction. An inner portion of the lock bar 4 is inserted into a lock bar insertion groove 30 provided in the second plug piece 21. Spring receiving portions 35 protrude from the front and rear ends of the inner portion of the lock bar 4. A coil spring 36 is interposed between the spring receiving portion 35 and the spring mounting recess 31 of the second plug piece 21, and the lock bar 4 is urged outward by the coil spring 36. The inner peripheral portion of the lock bar 4 is in contact with or close to the outer peripheral portion of each second tumbler 33, thereby restricting movement of the lock bar 4 to the inside.

  An outer portion of the lock bar 4 is inserted into a lock bar insertion groove 15 provided in the outer cylinder 2. As a result, the rotation of the lock bar 4 with respect to the outer cylinder 2 is restricted, and the rotation of the plug 3 with respect to the outer cylinder 2 is also restricted.

  The tailpiece 5 includes a support column 37 and a protrusion 38 that protrudes rearward from the support column 37.

  The support | pillar part 37 has comprised substantially cylindrical shape. The support column 37 is rotatably mounted on the tailpiece mounting portion 16 of the outer cylinder 2. As a result, the tail piece 5 is rotatable with respect to the outer cylinder 2.

  As shown in FIG. 1 and FIG. 2, a vertical rectangular parallelepiped auxiliary clutch piece insertion groove 40 is provided on the front surface of the column portion 37 so as to face the clutch piece insertion groove 26 of the first plug piece 20. Yes. A spring mounting portion 41 is provided on the rear side of the auxiliary clutch piece insertion groove 40. As shown in FIG. 3, an annular engagement portion 43 that engages with the communication hole 17 of the outer cylinder 2 is formed on the outer periphery of the rear end of the column portion 37. A rotation restricting projection 44 protrudes outward from the outer periphery of the annular engagement portion 43, and the rotation restricting projection 44 engages with the rotation restricting groove 18 of the outer tube 2, whereby the outer cylinder 2 of the tailpiece 5. The rotation angle with respect to is regulated to 90 degrees.

  The clutch mechanism 6 connects the first plug piece 20 and the tail piece 5. As shown in FIGS. 1 and 2, the clutch mechanism 6 includes a clutch piece 45, an auxiliary clutch piece 46 arranged on the rear side of the clutch piece 45, and a coil spring arranged on the rear side of the auxiliary clutch piece 46. 47.

  The clutch piece 45 is inserted into the clutch piece insertion groove 26 of the first plug piece 20 so as not to be relatively rotatable. The clutch piece 45 has a vertically long rectangular column shape. A through hole 50 passes through the upper and lower portions of the clutch piece 45 from the front surface to the rear surface. Each through hole 50 has a horizontally long rectangular parallelepiped shape.

  The auxiliary clutch piece 46 is disposed on the front side of the fitting groove 19 of the outer cylinder 2 together with the clutch piece 45. The auxiliary clutch piece 46 is inserted into the auxiliary clutch piece insertion groove 40 of the tail piece 5 in a relatively non-rotatable state, and rotates integrally with the tail piece 5. The auxiliary clutch piece 46 includes a vertically long plate-like main body plate 51 and a fitting plate 52 bent rearward from both upper and lower ends of the main body plate 51, and has a substantially U-shaped cross section. .

  Convex portions 53 are provided on the upper and lower portions of the front surface of the auxiliary clutch piece 46. Each convex portion 53 has a rectangular shape in front view, and an inclined portion 54 is formed on the front surface of each convex portion 53. Each inclined portion 54 is inclined with respect to a plane perpendicular to the axial direction of the cylinder lock 1. Each convex portion 53 is inserted into each through hole 50 of the clutch piece 45.

  The coil spring 47 is interposed between the spring mounting portion 41 of the tail piece 5 and the rear surface of the main body plate 51 of the auxiliary clutch piece 46, and urges the clutch piece 45 and the auxiliary clutch piece 46 forward. .

  The decorative ring 7 is mounted on the outer periphery of the decorative ring mounting portion 11 of the outer cylinder 2, and the rear end portion of the decorative ring 7 is in contact with the annular protrusion 10 of the outer cylinder 2. A retaining ring insertion recess 55 is formed in the rear inner periphery of the decorative ring 7, and the outer portion of the retaining ring 13 is inserted into the retaining ring insertion recess 55, thereby separating the outer cylinder 2 and the decorative ring 7. It is regulated. The decorative ring 7 may be rotatable with respect to the outer cylinder 2 or may not be rotatable.

  A key guide mounting hole 56 having a circular shape in front view is formed in the inner periphery of the front portion of the decorative ring 7. A stepped portion 57 is provided near the center in the front-rear direction of the key guide mounting hole 56, and the inner diameter of the portion on the front side of the stepped portion 57 is smaller than the inner diameter of the portion on the rear side of the stepped portion 57.

  The key guide 8 includes a guide main body 58 that is rotatably mounted in the key guide mounting hole 56 of the decorative ring 7, and a spacer 60 that is attached to the rear end portion of the guide main body 58.

  The guide body 58 is made of, for example, stainless steel and is made of metal. As shown in FIG. 2, the rear surface of the guide body 58 is in contact with the front surface of the first plug piece 20, thereby restricting rearward movement of the guide body 58. An annular flange portion 61 projects from the outer periphery of the rear portion of the guide body 58, and the flange portion 61 abuts on the stepped portion 57 of the decorative ring 7, thereby restricting forward movement of the guide body 58. Has been.

  A key insertion hole 62 communicating with the key hole 22 of the first plug piece 20 is provided on the inner periphery of the guide body 58. The key insertion hole 62 is closed by a rotary shutter 63. The shutter 63 is urged in the closing direction by a torsion coil spring 64. As the key is inserted into the key insertion hole 62, the shutter 63 rotates backward against the urging force of the torsion coil spring 64. The insertion hole 62 is opened. (See the two-dot chain line in FIG. 2).

  As shown in FIG. 5, a spacer mounting groove 65 is recessed in the rear surface of the guide main body 58. The spacer mounting groove 65 has a semi-cylindrical shape when viewed from the back. Auxiliary protrusions 66 are provided at positions corresponding to the protrusions 29 of the first plug piece 20 on the left side (right side in FIG. 5) and the lower part of the spacer mounting groove 65. Each auxiliary projection 66 is provided at two positions with a phase interval of 90 degrees.

  As shown in FIGS. 1 and 2, the spacer 60 is mounted in the spacer mounting groove 65 of the guide body 58 in a state in which relative rotation is impossible. As shown in FIG. 6, the spacer 60 has a semi-cylindrical shape when viewed from the back. In the spacer 60, a key opening 67 is formed at a position corresponding to the key insertion hole 62 of the guide main body 58, and the key insertion hole 62 of the guide main body 58 is connected to the spacer 60 through the key opening 67. The key hole 22 of the first plug piece 20 is in communication. Concave portions 68 are provided on the left side (the right side portion in FIG. 6) and the lower portion of the outer periphery of the spacer 60, and the protrusions 29 of the first plug pieces 20 and the auxiliary protrusions 66 of the guide body 58 are provided in the respective recesses 68. They are fitted (see FIGS. 2 and 7). Each concave portion 68 is provided at two positions with a phase interval of 90 degrees.

  The cylinder lock 1 configured as described above is attached to a handle lock (not shown) attached to, for example, a door of a vending machine. The handle lock includes a handle portion that accommodates the cylinder lock, a handle lock main body that accommodates the handle portion, a biasing spring such as a coil spring that biases the handle portion forward, and the handle portion that locks the handle portion. Locking means for locking to the main body, and this locking means is connected to the tail piece 5 of the cylinder lock 1. When the tail piece 5 of the cylinder lock 1 is not rotating, the locking means locks the handle portion to the handle lock body against the biasing force of the bias spring, and the handle lock body The state in which the handle portion is accommodated is maintained. On the other hand, when the tail piece 5 of the cylinder lock 1 rotates, this rotation is transmitted to the locking means, and the locking of the handle portion and the handle lock body is released, and the handle is pressed by the biasing force of the biasing spring. The portion protrudes forward from the handle lock main body, and the handle portion can be rotated, and the door is unlocked along with the rotation operation.

  In the configuration as described above, when the key is not inserted into the key hole 22, as shown in FIGS. 1 and 2, the clutch piece 45 and the auxiliary clutch piece 46 are moved forward by the coil spring 47 (FIG. 1, FIG. 2, the entire clutch piece 45 is inserted into the clutch piece insertion groove 26 of the first plug piece 20, and the connection between the first plug piece 20 and the tail piece 5 is released. Has been.

  In order to unlock the door from this state, as shown in FIG. 8, the key 70 is inserted into the keyhole 22 along the front-rear direction. By this insertion, the tip of the key 70 presses the clutch piece 45, and the clutch piece 45 and the auxiliary clutch piece 46 slide rearward against the urging force of the coil spring 47. Along with this, the clutch piece 45 moves to a position straddling the clutch piece insertion groove 26 of the first plug piece 20 and the auxiliary clutch piece insertion groove 40 of the tail piece 5, and the first plug piece 20 and the tail piece 5 are moved. It is connected by a clutch piece 45.

  When the key 70 is inserted into the keyhole 22 as described above, the first tumblers 24 and the second tumblers 33 slide in a direction perpendicular to the axial direction of the cylinder lock 1, and the second tumblers 33 are locked. The positions of the bar engaging groove 34 and the lock bar 4 coincide with each other, and the restriction of movement to the inside of the lock bar 4 is released. Accordingly, the plug 3 can rotate with respect to the outer cylinder 2.

  In this state, when the joint key 70 inserted into the keyhole 22 is rotated from the locked position to the unlocked position, the plug 3 rotates with respect to the outer cylinder 2. The rotation of the plug 3 is transmitted to the tail piece 5 through the clutch piece 45, and the tail piece 5 rotates. Along with this, a handle lock (not shown) connected to the tailpiece 5 is activated, and the door can be unlocked.

  At this time, since the plug 3 and the tail piece 5 rotate integrally, the rotation angle of the plug 3 with respect to the outer cylinder 2 is restricted to 90 degrees that is the rotation angle of the tail piece 5 with respect to the outer cylinder 2. Further, since the protrusion 29 of the first plug piece 20 fits into the recess 68 of the spacer 60, the relative rotation of the key guide 8 with respect to the plug 3 is restricted, so the key hole 22 of the first plug piece 20 and the guide body The positions of the 58 key insertion holes 62 are the same.

  On the other hand, when an unauthorized unlocking action is to be performed by a cutting means such as a drill or a hole saw, a larger torque is transmitted from the cutting means to the key guide 8 than at the time of unlocking by the above-described key 70. . Along with this, when the key guide 8 rotates with a torque of a certain level or more, a force larger than usual is generated in the fitting portion between the recess 68 and the protrusion 29, and the protrusion 29 is broken by this force. Therefore, the key guide 8 can be rotated relative to the plug 3, and the key guide 8 is idled by the torque transmitted from the cutting means.

  In the present embodiment, as described above, when the unlocking operation is performed with the joint key 70, the relative rotation of the key guide 8 with respect to the plug 3 is restricted, and the position and guide of the key hole 22 of the first plug piece 20 are controlled. The positions of the key insertion holes 62 of the main body 58 can be matched. Therefore, it is possible to facilitate the unlocking operation of the door, and damage the appearance of the cylinder lock 1 by damaging the surface of the key guide 8 with the tip of the key 70, or deforming the tip of the key 70. It becomes possible to prevent the trouble that gets stuck. On the other hand, when the key guide 8 is rotated with a torque exceeding a certain level by a cutting means such as a drill or a hole saw, the key guide 8 is idled to prevent the plug 3 from being cut, and the plug 3 can be protected. .

  In addition, since the first plug piece 20 and the spacer 60 are provided with the protrusions 29 and the recesses 68 to suppress the relative rotation of the key guide 8 with respect to the plug 3, no additional parts are required. Therefore, manufacturing cost can be reduced and the cylinder lock 1 can be provided at low cost.

  Further, since the protrusion 29 and the recess 68 are provided on the outer periphery of the first plug piece 20 and the spacer 60, respectively, the protrusion 29 and the protrusion 29 are separated from the key insertion hole 62 formed on the inner periphery of the guide body 58. The recess 68 can be disposed. For this reason, it is possible to prevent the shutter 63 and the torsion coil spring 64 from interfering with the projection 29 and the recess 68.

  Further, since the protrusion 29 and the recess 68 are provided at two positions with a 90 degree interval, the key guide 8 can be stably assembled to the plug 3.

  In the present embodiment, the projection 29 is provided on the first plug piece 20 of the plug 3 and the recess 68 is provided on the spacer 60 of the key guide 8. However, in other embodiments, the plug 3 may be provided with a recess 68 and the key guide 8 may be provided with a protrusion 29.

  In the present embodiment, the case in which the concave portion 68 is provided in the spacer 60 has been described. However, in the case where the spacer 60 is not used in other different embodiments, the guide body 58 may be provided with the protruding portion 29 and the concave portion 68.

  In the present embodiment, the case where the projections 29 and the recesses 68 are provided at two positions at intervals of 90 degrees has been described. However, in other different embodiments, the projections 29 and the recesses 68 are provided at 120 degrees, 180 degrees, and the like. They may be provided at different intervals. Moreover, in other different embodiment, it is good also considering the installation location of the projection part 29 and the recessed part 68 as one place or multiple places of three or more places. However, in consideration of the ease of assembling the key guide 8 to the plug 3, it is preferable to provide the protrusions 29 and the recesses 68 at a plurality of positions with an interval of at least 90 degrees.

  Although this embodiment demonstrated the case where the cylinder lock 1 was attached to the door etc. which are installed outdoors, of course, it is also possible to attach the cylinder lock 1 of this invention to the door etc. which are installed indoors. The cylinder lock of the present invention is not limited to doors for architectural buildings, and can be applied to all kinds of doors such as doors of vending machines.

  In the present embodiment, the case where the handle lock is used as the locking / unlocking mechanism has been described. However, in another different embodiment, a locking / unlocking mechanism other than the handle lock may be used.

1 Cylinder lock 3 Plug 8 Key guide 22 Key hole 29 Projection 58 Guide body 60 Spacer 62 Key insertion hole 68 Recess

Claims (3)

A cylinder lock comprising: a rotatable plug having a key hole; and a key guide having a key insertion hole that is rotatably provided on the front side of the plug in the insertion direction of the key into the key hole and communicates with the key hole. Because
One of the plug or the key guide is provided with a recess,
The other of the plug or the key guide is provided with a protrusion that fits into the recess and restricts the relative rotation of the key guide with respect to the plug.
When the key guide is rotated with a torque of a certain level or more, the protrusion is broken by a force generated in a fitting portion between the recess and the protrusion, and the key guide can be rotated relative to the plug. Features cylinder lock. The key guide is
A guide body provided with the key insertion hole;
A spacer attached to an end of the guide body on the back side in the insertion direction,
The recess is provided on an outer periphery of the spacer;
2. The cylinder lock according to claim 1, wherein the protrusion is provided on an outer periphery of an end of the plug on the near side in the insertion direction.   3. The cylinder lock according to claim 1, wherein the recess and the protrusion are provided at a plurality of locations at intervals of at least 90 degrees.