Cylinder lock and building equipment appliance set

Abstract

A cylinder lock provided with a key changing mechanism capable of improving convenience. A cylinder lock provided with: an inner cylinder having a key hole into which a lock opening key is inserted; an outer cylinder which is fitted to the inner cylinder in a rotatable manner; and a key changing mechanism which is arranged in an axial direction and is provided across a shear line between the inner cylinder and the outer cylinder, wherein a plurality of cylinder locks having different axial lengths are all capable of being locked and unlocked using the same lock opening key.

Description

Technical Field

[0001] This disclosure relates to cylindrical locks and building equipment and machinery. Background Technology

[0002] Previously, to allow the same key to lock and unlock multiple doors, such as the entryway door and the kitchen back door, the same lock was often installed on these doors. In this case, if the key was lost and needed to be replaced, all the keys and locks on all the doors needed to be replaced, incurring significant costs. Therefore, considering security and the cost of replacing locks, a cylindrical lock with a key-changing mechanism is desired to enable the use of a single key to lock and unlock multiple doors.

[0003] As a cylindrical lock with a key-changing mechanism, a cylindrical lock with the following structure is known: it has a key-changing mechanism that extends throughout the inner and outer cylinders and has a center pin, a center pin receiving part, a storage pin, a center pin clearance hole, and a pressing pin, so that when a new key is used, the original key cannot be used (for example, see Patent Document 1).

[0004] This cylindrical lock is configured such that when a new key is inserted into the keyhole, the center pin, housed in the center pin holder within the inner cylinder, moves across the shear line toward the outer cylinder. In this state, when the inserted key is rotated in the direction of key change operation, the center pin that has moved to the outer cylinder is housed in a center pin clearance hole within the inner cylinder, adjacent to the original center pin holder. Consequently, the tumbler pin within the outer cylinder corresponding to the original center pin holder protrudes across the shear line toward the inner cylinder, making it impossible to unlock using the original key.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2008-38429 Summary of the Invention

[0008] The technical problem that the invention aims to solve

[0009] If not only entrance doors and kitchen back doors, but also the locks used for various building equipment and appliances installed in a residential building, such as doors, parcel lockers, garage doors, window shutters, mailboxes, etc., could be locked and unlocked with the same key, the convenience of the building would be greatly improved.

[0010] However, since the size of building equipment and machinery varies depending on the type, there are cases where the axial length of the lock used varies depending on the type of building equipment and machinery, which poses a problem from the perspective of improving convenience.

[0011] Therefore, the purpose of this disclosure is to provide a cylindrical lock with a key-changing mechanism that improves convenience, and a building equipment and machinery assembly that improves convenience.

[0012] Technical solutions for solving technical problems

[0013] This disclosure relates to a cylindrical lock comprising: an inner cylinder having a keyhole for inserting a key; an outer cylinder rotatably fitted into the inner cylinder; and a key-changing mechanism arranged axially and configured to clamp a shear line between the inner cylinder and the outer cylinder, wherein multiple cylindrical locks with different axial lengths can be locked and unlocked using the same key.

[0014] This invention relates to a cylindrical lock comprising: an inner cylinder having a keyhole for inserting a key; an outer cylinder rotatably fitted into the inner cylinder; and pin structures arranged axially and forming a key-changing mechanism sandwiching a shear line between the inner cylinder and the outer cylinder, wherein a first pin structure row and a second pin structure row are respectively formed by arranging a plurality of the pin structures at predetermined intervals along the axial direction of the cylindrical lock.

[0015] This disclosure relates to a building equipment and machinery group comprising multiple building equipment and machinery having opening and closing components, wherein the multiple building equipment and machinery commonly include a cylindrical lock, the cylindrical lock comprising: an inner cylinder having a keyhole for inserting a key; an outer cylinder rotatably fitted into the inner cylinder; and a key changing mechanism arranged axially and disposed across a shear line between the inner cylinder and the outer cylinder, wherein multiple cylindrical locks with different axial lengths can be locked and unlocked using the same key. Attached Figure Description

[0016] Figure 1 This is a perspective view showing the cylindrical lock and the unlocking key of this embodiment.

[0017] Figure 2 This is an exploded perspective view of the cylindrical lock according to this embodiment.

[0018] Figure 3 From and Figure 2 Exploded perspective views of the cylindrical lock of this embodiment from different angles.

[0019] Figure 4 This is a front view of the cylindrical lock of this embodiment, viewed from the side where the key is inserted.

[0020] Figure 5 This is a rear view of the cylindrical lock of this embodiment, viewed from the side opposite to the side where the key is inserted.

[0021] Figure 6 It is along Figure 4 A cross-sectional view of line AA in the diagram.

[0022] Figure 7 This is a front view of the cover component of the cylindrical lock provided in this embodiment.

[0023] Figure 8 This is a diagram showing the outer circumferential surface of the front side of the inner cylinder.

[0024] Figure 9 It is along Figure 4 A cross-sectional view of the BB line in the diagram.

[0025] Figure 10 This is a cross-sectional view showing the key-changing mechanism.

[0026] Figure 11 This is a diagram showing the locking slot of the first unlocking key.

[0027] Figure 12 This is a cross-sectional view showing the action of the key-changing mechanism when the first key is inserted into the keyhole.

[0028] Figure 13 This is a cross-sectional view showing the action of the key-changing mechanism when the first key is inserted into the keyhole.

[0029] Figure 14 This is a diagram showing the engagement slot of the second unlocking key.

[0030] Figure 15 This is a cross-sectional view showing the action of the key-changing mechanism when the second key is inserted into the keyhole.

[0031] Figure 16 This is a cross-sectional view showing the action of the key-changing mechanism when the second key is inserted into the keyhole.

[0032] Figure 17 This is a cross-sectional view showing the action of the key-changing mechanism when the second key is inserted into the keyhole.

[0033] Figure 18 This is a cross-sectional view showing the action of the key-changing mechanism when the second key is inserted into the keyhole.

[0034] Figure 19 This is a cross-sectional view showing the action of the key-changing mechanism when the second key is inserted into the keyhole.

[0035] Figure 20 It means being able to utilize and Figure 1 The diagram shows a perspective view of other cylindrical locks that can be locked and unlocked using the same key as the shown key.

[0036] Figure 21 yes Figure 20 The cross-sectional view of the cylindrical lock shown.

[0037] Figure 22 This is a front view of an entrance door equipped with the cylindrical lock of this embodiment.

[0038] Figure 23 This is a front view of a parcel locker equipped with the cylindrical lock of this embodiment.

[0039] Figure 24 This is a front view of a door equipped with the cylindrical lock of this embodiment.

[0040] Figure 25 This is a conceptual diagram illustrating the use of the same key to lock and unlock various building equipment and machinery.

[0041] Figure 26 This is a conceptual diagram illustrating the use of the same unlocking key to change keys for various building equipment and machinery.

[0042] Figure 27 This is a conceptual diagram of a secure area where the same key is used for both locking and unlocking. Detailed Implementation

[0043] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The cylindrical lock 1 of this embodiment is used with multiple unlocking keys capable of locking and unlocking the cylindrical lock 1. In the cylindrical lock 1 of this embodiment, 11 unlocking keys, from the first to the eleventh, can be used; however, in this specification and accompanying drawings, only two of the 11 unlocking keys 100 are shown (see reference). Figure 1 , Figure 11 ) and unlocking key 100A (refer to Figure 14 The following explanation is provided: Key 100 is the first key, and key 100A is the second key.

[0044] like Figure 6 As shown, the cylindrical lock 1 has a first axial length L10. (As indicated...) Figure 2 and Figure 3 As shown, the cylindrical lock 1 has an inner cylinder 2, an outer cylinder 3, a drive pin 41, a pin 42, a force-applying component 43 consisting of a spring that applies force to the drive pin 41 toward the pin 42, a locking pin 5, a pair of cover components 6, inner and outer cylinder fixing pins 7, a pressing component 8, and a key changing mechanism 9.

[0045] Here, the directions in each diagram are defined. The directions indicated by the arrows at both ends of the diagram represent the direction along the central axis J of the cylinder lock 1. This direction is consistent with the axial direction of the inner cylinder 2 and the outer cylinder 3. X1 represents the front side of the cylinder lock 1, and X2 represents the rear side of the cylinder lock 1. For example, when the cylinder lock 1 is installed on an entryway door, the front side X1 is the outdoor side, and the rear side X2 is the indoor side.

[0046] like Figure 2 and Figure 3 As shown, the inner cylinder 2 is a generally cylindrical component that can be rotatably fitted into the outer cylinder 3. The material of the inner cylinder 2 is not particularly limited, and it can be made of metals such as brass. The inner cylinder 2 is fitted into the inner side of the outer cylinder 3. In the inner cylinder 2, a cylindrical keyhole 21 is formed along the axial direction of the inner cylinder 2, into which the unlocking keys 100 and 100A can be inserted.

[0047] like Figure 2 and Figure 3 As shown, a plurality of cylindrical pin holes 22 are formed on the outer peripheral surface 20 of the inner cylinder 2, each communicating with the keyhole 21. The pin holes 22 are holes for at least a portion of the insertable drive pin 41 and the tumbler pin 42. In this embodiment, a row of pin holes is formed by arranging a plurality of pin holes 22 along the axial direction of the inner cylinder 2.

[0048] like Figure 2 , Figure 3 as well as Figure 6 As shown, on the outer peripheral surface 20 of the rear end X2 of the inner cylinder 2, a plurality of fitting holes 23 communicating with the keyhole 21 are formed at predetermined intervals along the circumferential direction. In this embodiment, four fitting holes 23 are formed on the outer peripheral surface 20 of the inner cylinder 2. The keyhole 21 side of the inner peripheral surface of the fitting hole 23 is formed with a small diameter. Thus, as Figure 6 As shown, an annular step portion 23a is formed on the inner circumferential surface of the fitting hole 23.

[0049] Insert the drive pins 24 into the four fitting holes 23 respectively. Figure 3 and Figure 6 As shown, the drive pin 24 has a large-diameter portion 241, a small-diameter portion 242, and a drive end portion 243 sequentially along the axial direction from the radially outer side of the inner cylinder 2. The outer diameter of the drive end portion 243 is smaller than the outer diameter of the small-diameter portion 242. When the drive pin 24 is inserted into the fitting hole 23 from the radially outer side of the inner cylinder 2, the large-diameter portion 241 of the drive pin 24 abuts against the annular stepped portion 23a of the fitting hole 23, preventing further insertion into the keyhole 21. In this state, as... Figures 4-6As shown, the drive end 243 protrudes from the fitting hole 23 into the keyhole 21. The large-diameter portion 241 of the drive pin 24 is completely housed within the fitting hole 23 and does not protrude radially outward beyond the outer circumferential surface 20 of the inner cylinder 2. The drive ends 243 of the four drive pins 24 engage with the front ends of the unlocking keys 100 and 100A inserted into the keyhole 21, as described later. Thus, the rotation of the four drive pins 24 and the unlocking keys 100 and 100A in conjunction causes the inner cylinder 2 to rotate relative to the outer cylinder 3.

[0050] like Figure 3 and Figure 5 As shown, a recess 25 is formed on the outer peripheral surface 20 of the rear end X2 of the inner cylinder 2 for engagement with the engaging pin 5, which will be described later. The recess 25 extends along the axial direction of the inner cylinder 2. Figure 5 As shown, the width of the circumferential recess 25 along the outer peripheral surface 20 of the inner cylinder 2 is smaller than the outer diameter of the cylindrical locking pin 5.

[0051] like Figure 2 and Figure 3 As shown, the outer cylinder 3 is a generally cylindrical component that can be fitted into the inner cylinder 2 from the inside. The material of the outer cylinder 3 is not particularly limited; for example, it can be made of a metal such as brass, similar to the inner cylinder 2. The outer cylinder 3 is fixed to a door (not shown) equipped with a cylindrical lock 1 in a non-rotatable manner. The outer cylinder 3 is fitted into the inner cylinder 2 by abutting its inner circumferential surface, which serves as the sliding surface with the inner cylinder 2, against the outer circumferential surface 20 of the inner cylinder 2. The axial length of the outer cylinder 3 is slightly shorter than the axial length of the inner cylinder 2. Thus, as... Figure 6 As shown, the inner cylinder 2, which is aligned with and fitted into the outer cylinder 3 on the front side X1, protrudes further rearward X2 than the outer cylinder 3. The portion of the inner cylinder 2 that protrudes rearward X2 from the outer cylinder 3 is used to connect with a functional component (not shown) of the cylinder lock 1.

[0052] The outer cylinder 3 has a cylindrical hole 31 formed along its axial direction, which allows the inner cylinder 2 to be fitted into it. A plurality of cylindrical pin holes 32 communicating with the hole 31 are formed on the outer circumferential surface 30 of the outer cylinder 3. Each pin hole 32 is a hole through which at least a portion of a drive pin 41 and a ball pin 42 can be inserted. The plurality of pin holes 32 of the outer cylinder 3 are configured to communicate with the plurality of pin holes 22 of the inner cylinder 2. In this embodiment, a row of pin holes is formed by arranging the plurality of pin holes 32 along the axial direction of the outer cylinder 3. The same row of pin holes as the row of pin holes in the inner cylinder 2 is formed in multiple rows in the circumferential direction of the outer cylinder 3. When the inner cylinder 2 is rotated relative to the outer cylinder 3 and positioned in a predetermined position, at least a portion of the drive pin 41 and the ball pin 42 are connected to each other in an insertable manner.

[0053] like Figures 2-5As shown, an axially oriented cover component mounting groove 33 is provided on the outer peripheral surface 30 of the outer cylinder 3. The cover component mounting groove 33 has a generally cuboid shape in cross-section and opens towards the outer peripheral surface 30 of the outer cylinder 3. The cover component mounting groove 33 extends from the front side X1 end face of the outer cylinder 3 to the rear side X2 end face. In this embodiment, two cover component mounting grooves 33 are provided on the outer peripheral surface 30 of the outer cylinder 3. Figure 4 and Figure 5 As shown, the two cover component mounting slots 33 are arranged at an angle of 180 degrees apart in the circumferential direction of the outer peripheral surface 30 of the outer cylinder 3. The two cover component mounting slots 33 are configured to engage with the curved portion 62 of the cover component 6, which will be described later.

[0054] like Figure 3 and Figure 5 As shown, an axially oriented cutout 34 is formed at the rear end (X2) of the outer cylinder 3. The cutout 34 is configured to communicate with the recess 25 of the inner cylinder 2. The cutout 34 is formed by cutting the outer peripheral surface 30 from the rear end face (X2) towards the front end (X1) of the outer cylinder 3 into a generally rectangular parallelepiped shape in plan view. The hole 31 communicates with the radially outer side of the outer cylinder 3 through the cutout 34. The cutout width and length of the cutout 34 are approximately equal to the outer diameter and axial length of the cylindrical locking pin 5.

[0055] The drive pin 41 and the pin 42 are both generally cylindrical components. The drive pin 41 and the pin 42 are respectively housed in the pin hole 22 of the inner cylinder 2 and the pin hole 32 of the outer cylinder 3, allowing them to slide radially in the inner cylinder 2 and outer cylinder 3. The pin 42 is a pin disposed on the keyhole 21 side of the pin holes 22 and 32. The front end of the pin 42, which abuts against the unlocking keys 100 and 100A, has a rounded corner shape. One end of the drive pin 41 abuts against the pin 42, and the other end abuts against the force-applying component 43. Figure 2 and Figure 3 In this context, it simply refers to a set of drive pins 41, ball pins 42, and force-applying components 43, but the set of drive pins 41, ball pins 42, and force-applying components 43 is provided to correspond to a set of multiple pin holes 22, 32.

[0056] In the cylindrical lock 1, since the functions of the drive pin 41, the tumbler pin 42, and the force-applying component 43 are known, therefore... Figure 9 The diagrams of drive pin 41, ball pin 42 and force application component 43 will be omitted from hereafter.

[0057] The locking pin 5 is a component that prevents the rotation of the inner cylinder 2 relative to the outer cylinder 3 when the inner cylinder 2 is in a rotational state relative to the outer cylinder 3, allowing the unlocking keys 100 and 100A to be inserted or removed relative to the keyhole 21. The locking pin 5 is cylindrical in shape. The axial direction of the locking pin 5 is along the axial direction of both the inner cylinder 2 and the outer cylinder 3. A neck 5a extending throughout the entire circumference is formed at the center of the axial direction of the locking pin 5. Figure 5 As shown, when the inner cylinder 2 and the outer cylinder 3 are engaged, the locking pin 5 is configured to engage with the recess 25 of the inner cylinder 2 and is completely housed within the cutout 34 of the outer cylinder 3. The locking pin 5 within the cutout 34 does not protrude radially outward compared to the outer circumferential surface 30 of the outer cylinder 3.

[0058] The engaging pin 5 housed within the cutout 34 is subjected to force by an arc-shaped torsion spring 51, which acts as a force-applying component, toward the inner cylinder 2. The torsion spring 51 is mounted in a spring mounting groove 35, which is formed circumferentially on the outer peripheral surface 30 of the rear side X2 end of the outer cylinder 3. The two ends 51a of the torsion spring 51 are engaged in spring locking grooves 36 formed on the outer peripheral surface 30 of the outer cylinder 3. The torsion spring 51 mounted in the spring mounting groove 35 engages with the constricted neck 5a of the engaging pin 5, applying force from the radially outer side of the outer cylinder 3.

[0059] exist Figure 5 In the shown state, the locking pin 5 inside the cutout 34 of the outer cylinder 3 engages with the recess 25 of the inner cylinder 2. At this time, the rotation of the inner cylinder 2 relative to the outer cylinder 3 is suppressed, and the clicking sensation when the locking pin 5 engages with the recess 25 is transmitted to the user's finger that rotates the unlocking key 100. Thus, the user can identify the insertable position of the unlocking key 100 and can easily maintain the rotational state of the inner cylinder 2 relative to the outer cylinder 3 in the insertable position. The torsion spring 51 that applies force to the locking pin 5 engages with the neck 5a of the locking pin 5 and is fitted into the spring mounting groove 35 of the outer cylinder 3, so the outer diameter of the outer cylinder 3 does not increase, and the diameter of the cylinder lock 1 can be reduced.

[0060] The cover member 6 covers a plurality of pin holes 32 opening on the outer peripheral surface 30 by being mounted along the outer peripheral surface 30 of the outer cylinder 3. The cover member 6 is mounted on the outer cylinder 3 in a state that overcomes the force exerted by the force-applying member 43 that applies a force to the drive pin 41. Thus, the drive pin 41 is received in the pin holes 32 and is subjected to a radially inward force toward the outer cylinder 3. By covering the plurality of pin holes 32 of the outer cylinder 3 with the cover member 6, compared to a cover member that covers the pin holes of the drive pin in each row, the configuration space for the slots used to fix the cover member can be reduced. Therefore, the outer cylinder 3 can be made smaller in diameter. Figure 1 and Figure 6 As shown, the end of the rear side X2 of the cover component 6 is not covered by the spring mounting groove 35.

[0061] In this embodiment, two cover parts 6 are provided on the outer cylinder 3. The two cover parts 6 are combined to form a generally cylindrical shape on the outer circumferential surface 30 of the outer cylinder 3. By providing multiple cover parts 6, the assembly workability of the cylinder lock 1 can be improved compared to using a single cylindrical cover part. As the material for the cover parts 6, spring steel is preferably used. This allows the cover parts 6 to fit tightly against the outer cylinder 3 without gaps. In particular, stainless steel spring steel is more preferably used. Specifically, SUS304CSP can be cited as an example.

[0062] like Figure 7 As shown, the cover component 6 has: a curved portion 61, which has a shape formed by bending a flat plate along the outer peripheral surface 30 of the outer cylinder 3; and bent portions 62, which are formed at both ends of the curved portion 61. The curved portion 61 has a generally semi-circular cross-sectional shape. The bent portions 62 are disposed at both ends of the curved portion 61 in the direction of curvature, and are bent toward the inner side of the curved portion 61 respectively. The two cover components 6, 6 have the same shape and are arranged in a position symmetrical about the central axis J of the cylindrical lock 1.

[0063] Two cover components 6 are mounted on the outer peripheral surface 30 of the outer cylinder 3 by engaging their respective bent portions 62 with two cover component mounting grooves 33, 33 formed on the outer peripheral surface 30 of the outer cylinder 3. Before the cover component 6 is mounted on the outer cylinder 3, the bent portion 61 of the cover component 6 is bent inward with a curvature slightly greater than the curvature of the outer peripheral surface 30 of the outer cylinder 3. Therefore, when the cover component 6 is mounted on the outer cylinder 3, the bending portion 62 is firmly engaged with the cover component mounting groove 33 by utilizing the spring force exerted by the bent portion 61, and the bent portion 61 fits tightly against the outer cylinder 3.

[0064] Next, the axial anti-disengagement structure of the inner cylinder 2 and outer cylinder 3 in the cylindrical lock 1 of this embodiment will be described.

[0065] like Figure 2 , Figure 3 and Figure 6 As shown, a circumferentially extending fixing pin insertion groove 26 is formed on the outer peripheral surface 20 of the inner cylinder 2. Figure 6 As shown, the retaining pin insertion groove 26 is a rectangular groove with the same width recessed axially from the outer peripheral surface 20 of the inner cylinder 2 toward the keyhole 21. In this embodiment, the retaining pin insertion groove 26 is located at the end of the front side X1 of the inner cylinder 2 and is formed into a ring shape by machining the entire circumference of the outer peripheral surface 20. The plurality of pin holes 22 of the inner cylinder 2 are located at a position X2 further rearward than the retaining pin insertion groove 26.

[0066] like Figure 2 , Figure 3 and Figure 6As shown, a cylindrical fixing pin insertion hole 37 is formed on the outer peripheral surface 30 of the front side X1 of the outer cylinder 3, at a position corresponding to the fixing pin insertion groove 26 of the inner cylinder 2. The fixing pin insertion hole 37 communicates with the hole portion 31. Figure 1 and Figure 6 As shown, the end of the front side X1 of the cover component 6 is not covered by the fixing pin insertion hole 37.

[0067] like Figure 6 As shown, the inner diameter of the fixing pin insertion hole 37 is larger than the width of the fixing pin insertion groove 26 along the axial direction of the inner cylinder 2. Therefore, when the inner cylinder 2 and the outer cylinder 3 are fitted together, the fixing pin insertion groove 26 and the stepped portions 26a respectively disposed on the front side X1 and rear side X2 of the fixing pin insertion groove 26 face into the fixing pin insertion hole 37. The stepped portions 26a are formed from a portion of the outer peripheral surface 20 of the inner cylinder 2.

[0068] Multiple retaining pin insertion holes 37 are formed in the outer cylinder 3. In this embodiment, four retaining pin insertion holes 37 are formed in the outer cylinder 3. On the outer cylinder 3, two retaining pin insertion holes 37 are arranged as a group, and the two groups of retaining pin insertion holes 37 are arranged along the circumference of the outer cylinder 3, separated by the cover component mounting groove 33. Figure 4 As shown, the angle θ between the central axis 37a of each of the two fixing pin insertion holes 37 forming a set and the circumferential direction of the outer cylinder 3 is less than 180 degrees. The lower limit of this angle θ is set to an angle such that the two fixing pin insertion holes 37 do not interfere with each other, and the two inner and outer cylinder fixing pins 7 inserted into each fixing pin insertion hole 37 (described later) do not interfere with each other. The specific angle θ is not particularly limited as long as it is other than 180 degrees, for example, it can be set to 30 degrees.

[0069] Inner and outer cylinder retaining pins 7 can be inserted into at least two of the multiple retaining pin insertion holes 37. In this embodiment, metal inner and outer cylinder retaining pins 7 are respectively inserted into two retaining pin insertion holes 37 that constitute a group of four retaining pin insertion holes 37. Figure 4 and Figure 6 As shown, the inner and outer cylinder fixing pins 7 have, sequentially, cylindrical small-diameter portions 71, large-diameter portions 72, and positioning ends 73, respectively, along the axial direction of the outer cylinder 3 from the radially outer side of the outer cylinder 3. The outer diameter of the large-diameter portion 72 is less than the inner diameter of the fixing pin insertion hole 37 and is larger than the groove width of the fixing pin insertion groove 26 along the axial direction of the inner cylinder 2. The outer diameter of the positioning end 73 is smaller than the outer diameter of the large-diameter portion 72 and is less than the groove width of the fixing pin insertion groove 26 along the axial direction of the inner cylinder 2. In this embodiment, the inner and outer cylinder fixing pins 7 are fixing pins used to restrict the axial movement of the inner cylinder 2 and to fix it so that the inner cylinder 2 will not fall off the outer cylinder 3 axially.

[0070] The axial length of the inner and outer cylinder retaining pins 7 is greater than the axial length of the retaining pin insertion hole 37. Specifically, the combined length of the small diameter portion 71 and the large diameter portion 72 of the inner and outer cylinder retaining pins 7 in the axial direction is shorter than the axial length of the retaining pin insertion hole 37. The length of the axial positioning end 73 of the inner and outer cylinder retaining pins 7 is less than or equal to the depth of the retaining pin insertion groove 26 of the inner cylinder 2.

[0071] When the inner and outer cylinder fixing pins 7 are inserted into the fixing pin insertion hole 37 radially outward from the outer cylinder 3 with the positioning end 73 as the leading end, the large diameter portion 72 of the inner and outer cylinder fixing pins 7 abuts against the stepped portion 26a facing into the fixing pin insertion hole 37, preventing further insertion. In this state, as Figure 4 and Figure 6 As shown, the positioning end 73 of the inner and outer cylinder fixing pins 7 passes through the fixing pin insertion hole 37 of the outer cylinder 3 and is inserted into the fixing pin insertion groove 26 of the inner cylinder 2. Thus, the inner cylinder 2 is positioned so that it cannot be pulled out axially relative to the outer cylinder 3, and is engaged with the hole 31 of the outer cylinder 3. The positioning end 73 of the inner and outer cylinder fixing pins 7 can move circumferentially within the fixing pin insertion groove 26 of the inner cylinder 2. Therefore, when the cylinder lock 1 is unlocked by inserting the unlocking key 100 into the keyhole 21, the inner cylinder 2 can rotate freely relative to the outer cylinder 3.

[0072] The inner cylinder 2 is positioned by the inner and outer cylinder fixing pins 7, which are inserted radially from the outer cylinder 3, so that it cannot be pulled out axially. Therefore, it is not necessary to use the inner cylinder 2 to clamp the outer cylinder 3 from both sides axially as in the past. Since the axial length of the inner cylinder 2 and the outer cylinder 3 can be minimized, the cylinder lock 1 can be miniaturized.

[0073] Thus, the tolerance relationship between the inner cylinder 2 and the outer cylinder 3 in their fitted state consists of three parts: the groove width of the fixing pin insertion groove 26 formed in the inner cylinder 2, the inner diameter of the hole 31 in the outer cylinder 3, and the outer diameter of the fixing pin 7 of the inner and outer cylinders. The portion of the outer cylinder 3 other than the inner diameter of the hole 31 is machined peripherally using a machine tool that cuts the fixing pin insertion groove 26 and the fixing pin 7 of the inner and outer cylinders, thus enabling high-precision machining. Therefore, the axial offset between the inner cylinder 2 and the outer cylinder 3 can be minimized. Because the gap between the inner cylinder 2 and the outer cylinder 3 can be reduced, the diameter of the cylinder lock 1 can be reduced.

[0074] like Figures 2-4 and Figure 6As shown, the two inner and outer cylinder fixing pins 7, inserted into the two fixing pin insertion holes 37, are pressed by the pressing member 8 from the radially outer side of the outer cylinder 3. This prevents the inner and outer cylinder fixing pins 7 from being pulled out of the outer cylinder 3 due to their own weight. The pressing member 8 in this embodiment is a spring member in an arc shape formed by bending a rod-shaped body made of spring-elastic metal along the circumference of the outer cylinder 3. A locking portion 8a, bent in the same direction, is formed at each end of the pressing member 8. The pressing member 8 is housed in a receiving groove 38 formed circumferentially on the outer peripheral surface 30 of the front side X1 end of the outer cylinder 3. The receiving groove 38 is formed throughout the entire circumference of the outer cylinder 3 and extends transversely through the two fixing pin insertion holes 37.

[0075] Two pressing member locking grooves 331, spaced apart in the circumferential direction, are formed on the outer peripheral surface 30 of the outer cylinder 3. The two pressing member locking grooves 331 are recessed into the outer peripheral surface 30 of the front side X1 end of the outer cylinder 3, opening towards the radially outer side and front side X1 of the outer cylinder 3. The pressing member locking grooves 331 are positioned offset relative to the cover member mounting groove 33, closer to the two fixing pin insertion holes 37 into which the two inner and outer cylinder fixing pins 7 are inserted. The two pressing member locking grooves 331 communicate circumferentially with the cover member mounting groove 33 on the outer peripheral surface 30 of the outer cylinder 3.

[0076] The length between the two locking portions 8a along the arc shape of the pressing member 8 is slightly smaller than the distance between the two pressing member locking grooves 331 along the circumference of the outer cylinder 3. Therefore, the pressing member 8 is elastically installed in the storage groove 38 along the circumference of the outer cylinder 3 by fitting the locking portions 8a into the pressing member locking grooves 331 respectively.

[0077] The pressing member 8, installed in the storage slot 38, is configured to pass transversely through the end face of the small-diameter portion 71 of the two inner and outer cylinder fixing pins 7 within the storage slot 38. As a result, the two inner and outer cylinder fixing pins 7 are pressed radially outward from the outer cylinder 3, preventing them from being pulled out of the fixing pin insertion hole 37. Figure 4 and Figure 6 As shown, the end faces of the small-diameter portions 71 of the inner and outer cylinder fixing pins 7, which are inserted into the fixing pin insertion holes 37, are positioned at a distance at least greater than the outer diameter of the rod-shaped body forming the pressing member 8, which is radially retracted inward relative to the outer peripheral surface 30 of the outer cylinder 3. The depth of the receiving groove 38 is at least greater than the outer diameter of the rod-shaped body forming the pressing member 8. Therefore, even if the two inner and outer cylinder fixing pins 7 are pressed radially outward from the outer cylinder 3 using the pressing member 8, the outer diameter of the outer cylinder 3 will not increase, and the reduction in diameter of the cylinder lock 1 will not be hindered.

[0078] The pressing component 8 only presses the inner and outer cylinder fixing pins 7 to the point that the inner and outer cylinder fixing pins 7 will not be pulled out of the fixing pin insertion hole 37, and in effect does not apply a force toward the inner cylinder fixing pin 7. Since the inner and outer cylinder fixing pins 7 do not press the inner cylinder 2, they do not become a resistance when the inner cylinder 2 rotates relative to the outer cylinder 3. Therefore, the inner cylinder 2 can rotate smoothly relative to the outer cylinder 3.

[0079] Since the central axes 37a of the two fixing pin insertion holes 37 intersect at an angle θ less than 180 degrees, the central axes 7a of the two inner and outer cylinder fixing pins 7 inserted into the two fixing pin insertion holes 37 also intersect at an angle θ less than 180 degrees. Therefore, the inner cylinder 2 will not wobble relative to the outer cylinder 3 in the direction of rotation centered on the central axis 7a of the inner cylinder fixing pin 7.

[0080] The axial positioning and anti-disengagement of the inner cylinder 2 and outer cylinder 3 are accomplished simply by inserting the inner and outer cylinder fixing pins 7 from the radially outer side of the outer cylinder 3 into the fixing pin insertion hole 37 and pressing them down with the pressing member 8. Therefore, the fitting of the inner cylinder 2 and outer cylinder 3 can be performed easily. Since the fixing pin insertion hole 37 is not covered by the cover member 6, the positioning of the inner cylinder 2 and outer cylinder 3 can be easily released simply by removing the pressing member 8 from the outer cylinder 3 and pulling out the inner and outer cylinder fixing pins 7 from the fixing pin insertion hole 37. The inner and outer cylinder fixing pins 7 can be easily pulled out by pinching the small diameter portion 71 with tweezers or similar clamps.

[0081] In the above embodiments, the inner and outer cylinder fixing pins 7 are respectively inserted into two sets of the four fixing pin insertion holes 37 formed in the outer cylinder 3. However, the arrangement of the two inner and outer cylinder fixing pins 7 is only required that they are not arranged at a 180-degree angle in the circumferential direction of the outer cylinder 3. Alternatively, two inner and outer cylinder fixing pins 7 can be inserted into any two of the four fixing pin insertion holes 37. All four fixing pin insertion holes 37 can also be inserted.

[0082] Next, the key-changing mechanism 9 of this embodiment will be described. For example... Figure 2 and Figure 3 As shown, the key-changing mechanism 9 includes: a key-changing pin structure 90 consisting of a lower pin 91, an upper pin 92, a ball 93, and a force-applying member 94; a lower pin hole 95 and a ball receiving groove 96 formed in the inner cylinder 2; and an upper pin hole 97 formed in the outer cylinder 3. The pin structure 90 is disposed throughout the inner cylinder 2 and the outer cylinder 3, passing over the shear line formed between the inner cylinder 2 and the outer cylinder 3.

[0083] like Figure 2 , Figure 3 , Figure 8 and Figure 9As shown, multiple pin holes 95 are formed on the outer peripheral surface 20 of the inner cylinder 2. Each pin hole 95 has a cylindrical shape that penetrates the inner cylinder 2 and communicates with the keyhole 21. The pin hole 95 is a hole through which the pin 91 of the pin structure 90 can be inserted and removed. In this embodiment, a row of pin holes 950 is formed on the inner cylinder 2 by five pin holes 95 arranged axially. In this embodiment, two rows of pin holes 950, 950 are formed on the inner cylinder 2 at a distance spaced apart in the circumferential direction. Specifically, the two rows of pin holes 950, 950 are arranged diagonally across the keyhole 21. That is, the two rows of pin holes 950, 950 are arranged 180 degrees apart in the circumferential direction of the inner cylinder 2.

[0084] All the pin holes 95 are of the same shape. For example... Figure 10 As shown, the lower pin hole 95 has a tapered surface 95a at its opening towards the outer peripheral surface 20 of the inner cylinder 2. This tapered surface 95a has a shape that gradually widens as it moves radially outward toward the inner cylinder 2. An annular stepped portion 95b is formed on the inner peripheral surface of the lower pin hole 95. Thus, the portion of the lower pin hole 95 that is radially inward toward the keyhole 21, compared to the stepped portion 95b, is formed with a smaller diameter.

[0085] All 96 spherical storage slots are of the same shape. For example... Figure 2 , Figure 3 and Figure 8 As shown, the spherical storage grooves 96 are formed on the outer peripheral surface 20 of the inner cylinder 2 in a one-to-one correspondence with the lower pin holes 95. Therefore, in this embodiment, a total of 10 spherical storage grooves 96, with 5 in each of the two rows of lower pin holes 950, are formed on the inner cylinder 2. The spherical storage grooves 96 are grooves capable of accommodating the spheres 93 that constitute the pin structure 90. As will be described later, the spheres 93 constitute an intermediate body. The spherical storage grooves 96 are intermediate body storage grooves that accommodate the intermediate body composed of spheres 93.

[0086] A spherical receiving groove 96 is recessed on the outer circumferential surface 20 of the inner cylinder 2 and does not penetrate the inner cylinder 2. The spherical receiving groove 96 is arranged adjacent to the lower pin hole 95 in the circumferential direction of the inner cylinder 2. More specifically, the spherical receiving groove 96 is arranged adjacent to the lower pin hole 95 in the circumferential direction of the inner cylinder 2. More specifically, the spherical receiving groove 96 is arranged near the corresponding lower pin hole 95 in a direction opposite to the rotation direction of the inner cylinder 2 when unlocking. In this embodiment, the rotation direction of the inner cylinder 2 when unlocking is clockwise when viewed from the front side X1 of the cylindrical lock 1.

[0087] like Figure 8 As shown, the width W2 of the spherical receiving groove 96 along the axial direction of the inner cylinder 2 is smaller than the width W1 along the circumferential direction of the inner cylinder 2. The width W2 is larger than the diameter of the sphere 93 constituting the pin structure 90. The width W2 is smaller than the outer diameter of the front end face 92a of the upper pin 92 constituting the pin structure 90.

[0088] like Figure 2 , Figure 3 , Figure 8 and Figure 9 As shown, multiple upper pin holes 97 are formed on the outer peripheral surface 30 of the outer cylinder 3. Each upper pin hole 97 has a cylindrical shape that penetrates the outer cylinder 3. The upper pin hole 97 is a hole through which the upper pin 92 of the pin structure 90 can be inserted and removed. The upper pin holes 97 are provided in a one-to-one correspondence with the lower pin holes 95 of the inner cylinder 2. Therefore, in this embodiment, two rows of upper pin holes 970 and 970 are arranged on the outer cylinder 3, corresponding to the two rows of lower pin holes 950 and 950 of the inner cylinder 2. Thus, a total of 10 upper pin holes 97, with 5 holes in each row, are formed on the outer cylinder 3. The 10 upper pin holes 97 of the outer cylinder 3 are arranged relative to the 10 lower pin holes 95 of the inner cylinder 2 such that they are radially aligned with the cylindrical lock 1 when the inner cylinder 2 and outer cylinder 3 are locked. The radially outer side of the upper pin holes 97 is closed by the cover member 6.

[0089] The pin structure 90 is configured to correspond to the two rows of lower pin holes 950, 950 and the two rows of upper pin holes 970, 970, respectively. Therefore, as Figure 9 As shown, in the cylindrical lock 1, the first pin structure column 900A and the second pin structure column 900B, each consisting of five pin structures 90 in each row along the axial direction, are arranged diagonally across the keyhole 21 in the cylindrical lock 1. That is, the two rows of pin structures 900A and 900B are arranged 180 degrees apart in the circumferential direction of the cylindrical lock 1.

[0090] The five pin structures 90 constituting each of the pin structure rows 900A and 900B are arranged at a predetermined spacing P along the axial direction of the cylindrical lock 1. In this embodiment, the spacing P is constant, but the spacing P does not necessarily have to be constant. The spacing P can also be different in the two pin structure rows 900A and 900B. However, as... Figure 9 As shown, one pin structure row 900B is positioned offset by half a pitch relative to the other pin structure row 900A towards the rear X2 side of the cylinder lock 1. One pin structure 90 corresponds to one key change. Therefore, the cylinder lock 1 of this embodiment can perform a maximum of 10 key changes. Since the two rows of pin structures 900A and 900B are arranged diagonally, even with an increase in the number of key changes, the axial length of the cylinder lock 1 can be suppressed from increasing.

[0091] The key changing operation begins sequentially from the pin structure 90 located on the front side X1 of the cylinder lock 1. Therefore, in the cylinder lock 1 of this embodiment, as... Figure 9 As shown, the key-changing action is performed alternately between the first pin structure 90A on the frontmost side X1 of the cylinder lock 1 and the tenth pin structure 90J on the rearmost side X2, alternating between the pin structure rows 900A and 900B.

[0092] The lower pin 91, which constitutes the pin structure 90, is made of a metal cylinder. For example... Figure 10 As shown, the lower pin 91 is inserted into the lower pin hole 95 of the inner cylinder 2 in a manner that allows it to slide radially along the inner cylinder 2. The front end 91a of the radially inner side of the lower pin 91 has a pointed shape with rounded corners. The rear end face 91b of the radially outer side of the lower pin 91 is a flat surface.

[0093] The lower pin 91 has a small-diameter portion 911 disposed radially inward and a large-diameter portion 912 adjacent to the radially outer side of the small-diameter portion 911. The small-diameter portion 911 is inserted into the inner side of the stepped portion 95b of the lower pin hole 95. The large-diameter portion 912 abuts against the stepped portion 95b of the lower pin hole 95 from the radially outer side, thereby preventing the lower pin 91 from moving further radially inward.

[0094] The upper pin 92, which constitutes the pin structure 90, is made of a metal cylinder. For example... Figure 10 As shown, the upper pin 92 is inserted into the upper pin hole 97 of the outer cylinder 3 in a manner that allows it to slide radially along the outer cylinder 3. The upper pin 92 has a small-diameter portion 921 disposed radially inward and a large-diameter portion 922 adjacent to the radially outer side of the small-diameter portion 921. When the upper pin 92 moves toward the inner cylinder 2 across the shear line, the small-diameter portion 921 can be inserted into the lower pin hole 95 which is radially outer of the step portion 95b of the lower pin hole 95 of the inner cylinder 2.

[0095] A concave spherical surface 923 is formed on the radially inner front end face 92a of the upper pin 92. The concave spherical surface 923 is recessed in a spherical shape from the front end face 92a of the upper pin 92 toward the radially outer side. A recess 924 is formed on the radially outer rear end face 92b of the upper pin 92. The recess 924 is recessed in a cylindrical shape from the rear end face 92b of the upper pin 92 toward the radially inner side.

[0096] The sphere 93 constituting the pin structure 90 is made of metal and forms an intermediate body disposed between the upper pin 92 and the lower pin 91. Specifically, the sphere 93 is configured to contact the rear end face 91b relative to the lower pin 91 and to be housed within a concave spherical surface 923 relative to the upper pin 92. The outer diameter of the sphere 93 is smaller than the outer diameter of the small diameter portion 921 of the upper pin 92. However, the intermediate body is not limited to a sphere. It can be a short cylinder or the like.

[0097] The force-applying component 94 constituting the pin structure 90 is made of a coil spring. The force-applying component 94 is housed in the recess 924 of the upper pin 92 and is disposed in a compressed state between the cover component 6 and the upper pin 92. Thus, the force-applying component 94 applies a force toward the radially inward side to the upper pin 92.

[0098] When the unlocking keys 100 and 100A are not inserted into the keyhole 21, such as Figure 10As shown, the lower pin 91, upper pin 92, and ball 93 move radially inward under the force of the force-applying component 94. At this time, as... Figure 10 As shown, the large-diameter portion 912 of the lower pin 91 abuts against the stepped portion 95b of the lower pin hole 95. In this state, the front end 91a of the lower pin 91 protrudes into the keyhole 21. The front end face 92a of the upper pin 92 does not protrude towards the inner cylinder 2, and does not obstruct the rotation of the inner cylinder 2. The ball 93 is disposed within the lower pin hole 95 of the inner cylinder 2.

[0099] Next, refer to Figure 1 and Figure 11 The unlocking key 100 will be described below. The unlocking key 100 of this embodiment is the first unlocking key initially used for the cylindrical lock 1. The unlocking key 100 is composed of a cylindrical rod-shaped body. Multiple drive engagement slots 101, driven engagement slots 102, and first key-changing engagement slots 103 are formed on the unlocking key 100. A handle 120 is provided at the rear end of the unlocking key 100.

[0100] Multiple drive engagement slots 101 are formed at the front end of the unlocking key 100. These slots extend from the front end of the unlocking key 100 toward the rear end where the grip portion 120 is located. The arrangement of the multiple drive engagement slots 101 corresponds circumferentially to the arrangement of the drive ends 243 of the multiple drive pins 24 facing the keyhole 21 of the inner cylinder 2. The length of the unlocking key 100 is set to be sufficient for locking and unlocking the longest cylindrical lock among various cylindrical locks with envisioned axial lengths.

[0101] The driven engagement groove 102 is formed on the outer peripheral surface of the unlocking key 100 along the axial direction of the unlocking key 100. The driven engagement groove 102 corresponds to the arrangement of a plurality of pin 42 provided on the cylindrical lock 1. The pin 42 engages with the driven engagement groove 102, so that the shear line between the plurality of drive pins 41 and the pin 42 is aligned with the shear line between the inner cylinder 2 and the outer cylinder 3. When the unlocking key 100 is rotated in the unlocking direction in this state, the inner cylinder 2 rotates relative to the outer cylinder 3.

[0102] The key-changing engagement groove 103 is formed on the outer peripheral surface of the unlocking key 100 along the axial direction of the unlocking key 100. On the outer peripheral surface of the unlocking key 100, two key-changing engagement grooves 103, 103 are formed at a position 180 degrees apart in the circumferential direction, corresponding to the two rows of pin structures 900, 900. Figure 11 This indicates the key-changing engagement slot 103 corresponding to the pin structure column 900A. This key-changing engagement slot 103 is formed to enable... Figure 9The cylindrical lock 1 shown engages with the front ends 91a of all the lower pins 91 within the pin structure row 900A along its axial length L1. In the unlocking key 100, the key-changing engagement groove 103 corresponding to the pin structure row 900B also has the same shape as the key-changing engagement groove 103 corresponding to the pin structure row 900A, and is formed to engage with the front ends 91a of all the lower pins 91 within the pin structure row 900B.

[0103] Next, refer to Figure 12 and Figure 13 The unlocking operation of the cylindrical lock 1 using the first unlocking key 100 will be described. During the unlocking operation, the drive pin 41 and the tumbler pin 42 engage with the driven engagement slot 102 of the unlocking key 100, thus enabling the lock to be unlocked. Since such unlocking operation of the drive pin 41 and the locking pin 42 is known, Figure 12 and Figure 13 This only indicates the action of the first pin structure 90A that constitutes the pin structure 900A.

[0104] like Figure 12 As shown, when the unlocking key 100 is inserted into the keyhole 21 of the cylindrical lock 1, the front end 91a of the lower pin 91 of the first pin structure 90A engages with the key-changing engagement groove 103 of the unlocking key 100. At this time, the first pin structure 90A moves radially inward under the force of the force-applying component 94. Therefore, the large diameter portion 912 of the lower pin 91 abuts against the stepped portion 95b of the lower pin hole 95, and the front end face 92a of the upper pin 92 does not protrude towards the inner cylinder 2 and does not exceed the shear line. The ball 93 is disposed in the lower pin hole 95 of the inner cylinder 2. The shear line between the inner cylinder 2 and the outer cylinder 3 is disposed between the upper pin 92 and the ball 93.

[0105] In this state, when the unlocking key 100 is rotated a predetermined angle in the unlocking direction, such as Figure 13 As shown, the inner cylinder 2 rotates clockwise by a predetermined angle relative to the outer cylinder 3. In the pin structure 90A at this time, because a shear line is arranged between the upper pin 92 and the ball 93, the lower pin 91 and the ball 93 are housed in the lower pin hole 95 of the inner cylinder 2, and the upper pin 92 and the force-applying component 94 are housed in the upper pin hole 97 of the outer cylinder 3, causing the inner cylinder 2 to rotate. Thus, the cylindrical lock 1 is unlocked by the unlocking key 100.

[0106] Next, refer to Figure 14The unlocking key 100A will be described below. The unlocking key 100A in this embodiment is a second unlocking key. The unlocking key 100A is composed of a cylindrical rod-shaped body identical to that of the unlocking key 100. Multiple drive engagement slots 101, driven engagement slots 102, and a second key-changing engagement slot 103A are formed on the unlocking key 100A. The multiple drive engagement slots 101 and driven engagement slots 102 have the same structure as those of the unlocking key 100.

[0107] The second key-changing engagement groove 103A is formed on the outer peripheral surface of the unlocking key 100A along its axial direction. The key-changing engagement groove 103A corresponds to the pin structure row 900A, including the first pin structure 90A. The axial length L2 of the key-changing engagement groove 103A from the front end of the unlocking key 100A is shorter than the axial length L1 of the key-changing engagement groove 103A of the unlocking key 100. The difference in axial length L3 between L1 and L2 corresponds to the spacing P between the pin structures 90, 90 arranged in the pin structure row 900A. For example... Figure 12 As shown, no groove is formed along the axial length L3 to the extent that the lower pin 91 of the pin structure 90A moves radially inward. In the unlocking key 100A, the key-changing engagement groove corresponding to the pin structure row 900B has the same structure as the key-changing engagement groove 103 of the unlocking key 100.

[0108] Next, refer to Figures 15-18 The unlocking operation of a cylindrical lock 1 using a second unlocking key 100A in the event that the first unlocking key 100 has been lost is described. During the unlocking operation, the drive pin 41 and the pin 42 engage with the driven engagement slot 102 of the unlocking key 100A, thus enabling the lock to be opened. Since this unlocking operation of the drive pin 41 and the pin 42 is known, therefore... Figures 15-18 This only indicates the action of the first pin structure 90A that constitutes the pin structure 900A.

[0109] like Figure 15As shown, when the unlocking key 100A is inserted into the keyhole 21 of the cylindrical lock 1, the front end 91a of the lower pin 91 of the first pin structure 90A abuts against the outer peripheral surface 100a of the unlocking key 100A, and is in a non-engaged state with the key-changing engagement groove 103A. This is because the key-changing engagement groove 103A is not formed in the region corresponding to the axial length L3 of the lower pin 91 of the first pin structure 90A. Therefore, the front end 91a of the lower pin 91 is received in a manner that does not protrude into the keyhole 21 but is submerged in the lower pin hole 95 of the inner cylinder 2. The upper pin 92 is pressed by the ball 93, and while overcoming the force to compress the force-applying member 94, it moves radially outward within the upper pin hole 97. As a result, the rear end face 91b of the lower pin 91 is positioned adjacent to the radially inner end of the conical surface 95a of the lower pin hole 95. The ball 93 is positioned on the shear line between the inner cylinder 2 and the outer cylinder 3.

[0110] Because the contact surface of the upper pin 92 that abuts against the ball 93 is a concave spherical surface 923, the ball 93 is guided to press naturally against the central axis of the upper pin 92. Therefore, when the upper pin 92 moves, it will not wobble within the upper pin hole 97 and can move smoothly.

[0111] In this state, when the unlocking key 100A is rotated a predetermined angle in the unlocking direction, such as Figure 16 As shown, the inner cylinder 2 rotates clockwise by a predetermined angle relative to the outer cylinder 3. The rear end face 91b of the lower pin 91 is positioned adjacent to the radially inner end of the conical surface 95a of the lower pin hole 95, and the ball 93 is positioned on the shear line. Therefore, when the inner cylinder 2 rotates, the ball 93 is pressed radially outward and gradually moves toward the upper pin hole 97. At this time, the ball 93 rolls on the conical surface 95a of the lower pin hole 95 and moves smoothly toward the upper pin hole 97 as the inner cylinder 2 rotates. Thus, when the inner cylinder 2 rotates, only the lower pin 91 is housed in the lower pin hole 95 of the inner cylinder 2, and the upper pin 92 and the ball 93 are housed in the upper pin hole 97 of the outer cylinder 3. The second pin structure 90B to the tenth pin structure 90J, other than the first pin structure 90A, operate in the same manner as when the unlocking key 100 is inserted into the keyhole 21.

[0112] When the unlocking key 100A is rotated further in the unlocking direction, causing the inner cylinder 2 to rotate, as follows: Figure 17 As shown, the spherical receiving groove 96 of the inner cylinder 2 and the upper pin hole 97 of the outer cylinder 3 are aligned radially. Therefore, the spherical part 93 inside the upper pin hole 97 is pressed into the spherical receiving groove 96 by the upper pin 92, which is applied radially inward by the force-applying member 94. Figure 8 As shown, the width W2 of the ball receiving groove 96 along the axial direction of the inner cylinder 2 is smaller than the outer diameter of the top surface 92a of the upper pin 92. Therefore, even if the ball receiving groove 96 and the upper pin hole 97 are aligned in the radial direction, the upper pin 92 in the upper pin hole 97 will not be embedded in the ball receiving groove 96.

[0113] Next, as Figure 18 As shown, when the unlocking key 100A is rotated in the reset direction opposite to the unlocking direction, causing the inner cylinder 2 to rotate counterclockwise, the lower pin hole 95 of the inner cylinder 2 and the upper pin hole 97 of the outer cylinder 3 are aligned radially. Consequently, the upper pin 92 moves towards the inner cylinder 2 under the force of the force-applying component 94. With the sphere 93 housed within the sphere receiving groove 96, the upper pin 92 extends beyond the shear line and embeds itself into the lower pin hole 95 of the inner cylinder 2.

[0114] Thus, when the second unlocking key 100A is used to unlock the cylindrical lock 1, the ball 93 is housed in the ball housing groove 96 of the inner cylinder 2, and the rear end face 91b of the lower pin 91 in the first pin structure 90A is in direct contact with the front end face 92a of the upper pin 92. In this state, when the first unlocking key 100 is inserted into the keyhole 21 again, as... Figure 19 As shown, the front end 91a of the lower pin 91 engages with the key-changing engagement groove 103 of the unlocking key 100. At this time, the lower pin 91 and the upper pin 92 move together radially inward under the force of the force-applying member 94. Since there is no ball 93 between the lower pin 91 and the upper pin 92, the upper pin 92 protrudes towards the inner cylinder 2, crossing the shear line between the inner cylinder 2 and the outer cylinder 3. As a result, the small diameter portion 921 of the upper pin 92 fits into the lower pin hole 95, which is radially inward from the conical surface 95a. Therefore, even if the unlocking key 100 is rotated in the unlocking direction, the inner cylinder 2 will not rotate because the upper pin 92 is positioned in a manner that crosses the shear line. Therefore, the cylindrical lock 1 cannot be unlocked.

[0115] Similarly, by alternately shortening the key-changing engagement slots corresponding to the pin structure row 900A and the key-changing engagement slots corresponding to the pin structure row 900B by a distance P, key-changing operations from the second pin structure 90B to the tenth pin structure 90J can be further performed. Therefore, in the cylindrical lock 1 of this embodiment, the key-changing mechanism 9 can perform 10 key-changing operations using 11 unlocking keys from the first to the eleventh. The key-changing mechanism 9 is composed only of a pin structure 90 consisting of a lower pin 91, an upper pin 92, a ball 93, and a force-applying member 94, a lower pin hole 95 and a ball receiving groove 96 in the inner cylinder 2, and an upper pin hole 97 in the outer cylinder 3, thus suppressing the radial size of the cylindrical lock 1. The cylindrical lock 1 is formed with a small diameter and is small in size, so it can be installed not only in large building equipment and machinery, but also in small building equipment and machinery that could not be installed in the past.

[0116] The cylindrical locks 1 and 1A shown in this embodiment are positioned when the unlocking keys 100 and 100A are inserted into the keyhole by engaging multiple drive engagement grooves 101 formed at the front end of the unlocking keys 100 and 100A with the drive ends 243 of multiple drive pins 24 disposed at the rear side X2 end of the inner cylinder 2. This allows the inner cylinder 2 to rotate synchronously with the rotation of the unlocking keys 100 and 100A. The aforementioned positioning is achieved by engaging the drive engagement grooves 101 (sometimes referred to as "recesses") formed at the front end of the unlocking keys 100 and 100A with the drive ends 243 (sometimes referred to as "protrusions") of the drive pins 24 provided at the end of the keyhole 21. In this way, since the positioning is set at the end of the keyhole 21, multiple cylindrical locks 1 and 1A with different lengths (i.e., axial lengths) of the keyhole 21 can be locked and unlocked using the same unlocking keys 100 and 100A. Therefore, even if the axial lengths of the cylinder locks are different, they can be used together as long as the drive end 243 of the drive pin 24 is arranged at the rear end of the inner cylinder 2 X2.

[0117] Figure 20 and Figure 21 This indicates other cylindrical locks 1A whose axial length differs from that of cylindrical lock 1. Parts with the same symbols as cylindrical lock 1 indicate parts with the same structure; therefore, their descriptions refer to those of cylindrical lock 1 and are omitted below.

[0118] The cylindrical lock 1A has a second axial length L20. For example... Figure 21 As shown, the second axial length L20 of the cylindrical lock 1A is... Figure 6 The first axial length L10 of the cylindrical lock 1 shown is short. The cylindrical lock 1A has the same structure except that its axial length is shorter than that of the cylindrical lock 1. In the cylindrical lock 1A, the number of sets of drive pins 41 and tumbler pins 42 along the axial direction of the cylindrical lock 1A, as well as the number of sets of pin structures 90 constituting the key-changing mechanism 9, is less than that of the cylindrical lock 1. Therefore, the number of locking and unlocking combinations of drive pins 41 and tumbler pins 42 and the number of key changes in the cylindrical lock 1A are less than those in the cylindrical lock 1. However, the same drive pin 24 as that in the cylindrical lock 1 is arranged at the rear end X2 of the cylindrical lock 1A, allowing locking, unlocking, and key changes to be performed using the same unlocking keys 100 and 100A as those in the cylindrical lock 1. This cylindrical lock 1A is preferably applicable to smaller building equipment and machinery where it is difficult to install the cylindrical lock 1.

[0119] In cylindrical locks 1 and 1A, a locking mechanism (not shown) is connected to the rear end X2 of the inner cylinder 2. This locking mechanism operates in conjunction with the rotation of the inner cylinder 2 based on the rotational operation of the unlocking keys 100 and 100A. The locking mechanism is selected according to the building equipment and machinery on which the cylindrical locks 1 and 1A are installed. For example, the locking mechanism may also be a locking and unlocking mechanism that uses the rotation of a bolt and the inner cylinder 2 to perform locking and unlocking actions. The locking mechanism may also be a cam lock mechanism, which uses the rotation of a cam in conjunction with the rotation of the inner cylinder 2 to perform locking and unlocking.

[0120] Figure 22 This refers to an entryway door 200, which serves as a door or window. The entryway door 200 is a type of building equipment or fixture. The entryway door 200 is an opening and closing component that is retractably housed within a door opening 300 in the main body of the building. The entryway door 200 has a handle 201 for opening and closing on the front side of the door leaf, and a pair of cylindrical locks 1 respectively disposed above and below the handle 201. The pair of cylindrical locks 1 can also be cylindrical locks 1A.

[0121] Figure 23 This refers to a parcel locker 400. Parcel locker 400 is a type of building equipment. The parcel locker 400 has a frame 401 forming a cargo storage compartment inside, with a door 402 on its front surface as an opening and closing component. A handle 403 is provided on the front side of the door 402. A cylindrical lock 1 is installed on the handle 403. The cylindrical lock 1 can also be a cylindrical lock 1A.

[0122] Figure 24 This refers to a gate 500. Gate 500 is a type of building equipment. Gate 500 has a pair of door leaves 502, 502 that are openable and closable and mounted on the left and right walls 501, 501. The pair of door leaves 502, 502 are opening and closing components. Door leaves 502, 502 each have handles 503, 503 on their front ends. A cylindrical lock 1 is mounted on the front end of one of the door leaves 502. The cylindrical lock 1 can also be a cylindrical lock 1A.

[0123] These are merely examples of building equipment and machinery using the cylindrical locks 1 and 1A of this embodiment. Besides entrance doors 200, parcel lockers 400, and main doors 500, the cylindrical locks 1 and 1A of this embodiment can be applied to all building equipment and machinery requiring security, including doors and main doors. Examples of applications using cylindrical locks 1 and 1A include kitchen back doors, balcony doors, window surrounds, interior doors, garage roller shutters, window roller shutters, mailboxes, padlocks, crescent locks, safes, display cases, refrigerators, freezers, storage rooms (e.g., wine cellars), closets, furniture drawers, jewelry boxes, and even doors to machine rooms equipped with various mechanical devices. Thus, the cylindrical locks 1 and 1A of this embodiment, whether large or small, can be applied to building equipment and machinery groups consisting of various building equipment and machinery installed in a single residential building. That is, each building equipment and machinery group can share the same cylindrical lock 1 or 1A for locking and unlocking its opening and closing components using the same unlocking key.

[0124] Therefore, as Figure 25 As shown, by applying cylindrical locks 1 and 1A to various building equipment and machinery, locking and unlocking can be achieved using a common (identical) unlocking key 100 (the first key). Figure 26 As shown, by changing the key to the second unlocking key 100A (the second key), the first unlocking key 100 (the first key) can be set to unusable in all of the various building equipment and instruments, and the same unlocking key 100A after the key change can be used to lock and unlock.

[0125] These various building equipment and machinery can be configured in different areas. Figure 27 This is a conceptual diagram of security zones when the same key is used for locking and unlocking. Here, it represents zone A1, zone A2, zone A3, and zone A4.

[0126] Dividing the area into multiple zones refers to areas with different purposes. For example, in the case of a single building, Zone A1 is the building's site. A fence, railing, or wall forms the first perimeter of the site, creating a security perimeter. Zone A2 is the building itself, with its exterior walls forming the second perimeter. Zone A3 consists of the rooms within the building, with partitions within each room forming the third perimeter. Zone A4 contains important structures within the rooms, forming the fourth perimeter. These zones A1 through A4 each have different security levels. Security level refers to the level of accessibility within each zone. Typically, in residential areas, the security level is the same as home security, and Zone A2 is usually set with the highest security level to prevent unauthorized entry. In areas such as experimental facilities, research facilities, factories, or office buildings, the security requirements are higher than those for home security.

[0127] In multiple zones with different security levels, building equipment corresponding to the security level of each zone is selected from a group of building equipment consisting of various building equipment with cylinder locks of different axial lengths (e.g., cylinder locks 1 and 1A). Examples of building equipment installed in Zone 1 A1 include doors, parcel lockers, and mailboxes. Examples of building equipment installed in Zone 2 A2 include entrance doors, kitchen back doors, balcony doors, windows, and blinds installed at openings formed in the exterior walls. Examples of building equipment installed in Zone 3 A3 include interior doors at entrances to rooms such as living rooms, bedrooms, children's rooms, and storage rooms. Examples of building equipment installed in Zone 4 A4 include safes, jewelry boxes, display cabinets, refrigerators, and closets. The higher the security level of the zone, the longer the axial length of the cylinder lock installed on the building equipment, and the more sets of drive pins and tumblers are installed on the cylinder lock.

[0128] The cylindrical lock 1 shown in this embodiment has a longer axial length than the cylindrical lock 1A. This indicates an increase in the number of sets of drive pins 41 and pin 42 provided on the cylindrical lock 1, and correspondingly, an increase in the number of key differences, resulting in higher security. This cylindrical lock 1 is used, for example, in building equipment installed in the second area A2. On the other hand, the cylindrical lock 1A shown in this embodiment has a shorter axial length than the cylindrical lock 1. This indicates a decrease in the number of sets of drive pins 41 and pin 42 provided on the cylindrical lock 1A, and correspondingly, a decrease in the number of key differences, resulting in lower security than the cylindrical lock 1. This cylindrical lock 1A is used, for example, in building equipment installed in the third area A3.

[0129] Thus, the cylindrical locks 1 and 1A of this embodiment are installed on various building equipment and machinery located in different areas. Therefore, even when the security levels differ in the various areas, the same unlocking key 100 or 100A can be used to lock and unlock various building equipment and machinery simultaneously. Furthermore, in the event of loss of the previously used unlocking key 100, by replacing it with the next unlocking key 100A, the previously used unlocking key 100 can be rendered unusable in all areas of the building equipment and machinery. Therefore, even if the security levels differ in each area, the security provided by the cylindrical locks 1 and 1A can be maintained.

[0130] The cylindrical locks 1 and 1A and the building equipment and machinery group in this embodiment have the following effects.

[0131] The cylindrical locks 1 and 1A of this embodiment include: an inner cylinder 2 having a keyhole 21 for inserting unlocking keys 100 and 100A; an outer cylinder 3 rotatably fitted into the inner cylinder 2; and a key-changing mechanism 9 arranged axially and clamping the shear line between the inner cylinder 2 and the outer cylinder 3. Multiple cylindrical locks 1 and 1A with different axial lengths can be locked and unlocked using the same unlocking key 100 and 100A.

[0132] Therefore, even if the axial length of the cylindrical locks 1 and 1A varies depending on the type of building equipment, the same unlocking key 100 and 100A can be used to lock and unlock various building equipment, thus improving convenience.

[0133] In the cylindrical locks 1 and 1A of this embodiment, the key changing mechanism 9 respectively includes: an upper pin hole 97, which is radially disposed in the outer cylinder 3; an upper pin 92, which is housed in the upper pin hole 97 in a manner that allows it to move radially; a force-applying member 94, which applies force to the upper pin 92 in a radially inward direction; a lower pin hole 95, which is radially disposed through the inner cylinder 2; a lower pin 91, which is radially disposed in the lower pin hole 95, and whose front end 91a is arranged to protrude toward the keyhole 21; a ball 93 as an intermediate body, which is disposed between the upper pin 92 and the lower pin 91; and a ball housing groove 96 as an intermediate body housing groove, which is disposed in the inner cylinder 2 and is arranged adjacent to the lower pin hole 95 in a direction opposite to the rotation direction of the inner cylinder 2 when unlocking.

[0134] Therefore, the key-changing mechanism 9 consists only of a lower pin 91, an upper pin 92, a ball 93, a force-applying component 94, a lower pin hole 95 and a ball receiving groove 96 in the inner cylinder 2, and an upper pin hole 97 in the outer cylinder 3, thus suppressing the radial size of the cylinder lock 1. The cylinder lock 1 is formed with a small diameter and is compact, therefore it can be installed not only on large building equipment and machinery, but also on small building equipment and machinery that could not be installed previously.

[0135] In the cylindrical locks 1 and 1A of this embodiment, the lower pin hole 95 has a tapered surface 95a at the opening of the inner cylinder 2 toward the outer peripheral surface 20, which gradually expands in diameter toward the radially outward.

[0136] Therefore, when the key-changing action is performed, the ball 93 rolls on the conical surface 95a of the lower pin hole 95 and can move smoothly toward the upper pin hole 97 as the inner cylinder 2 rotates. Thus, the inner cylinder 2 can rotate smoothly during the key-changing action.

[0137] In the cylindrical locks 1 and 1A of this embodiment, a concave spherical surface 923 is formed on the front end face 92a on the radially inner side of the upper pin 92.

[0138] Therefore, since the contact surface between the upper pin 92 and the ball 93 is formed by a concave spherical surface 923, the ball 93 is guided to press naturally against the central axis of the upper pin 92. Thus, when the upper pin 92 moves, it will not wobble within the upper pin hole 97 and can move smoothly.

[0139] The cylindrical locks 1 and 1A of this embodiment include: an inner cylinder 2 having a keyhole 21 for inserting unlocking keys 100 and 100A; an outer cylinder 3 rotatably fitted into the inner cylinder 2; and a pin structure 90 arranged axially and forming a key changing mechanism 9 that clamps the shear line between the inner cylinder 2 and the outer cylinder 3. The cylindrical locks 1 and 1A have a first pin structure row 900A and a second pin structure row 900B respectively formed by arranging a plurality of pin structures 90 at a predetermined interval along the axial direction of the cylindrical locks 1 and 1A.

[0140] Therefore, by arranging multiple pin structures on the first pin structure column 900A and the second pin structure column 900B, a cylindrical lock 1, 1A with a high number of key changes can be constructed, thereby improving convenience.

[0141] In the cylindrical locks 1 and 1A of this embodiment, the first pin structure row 900A and the second pin structure row 900B are arranged diagonally across the keyhole 21 and are staggered by half a distance in the axial direction of the cylindrical locks 1 and 1A.

[0142] Therefore, by arranging the first pin structure row 900A and the second pin structure row 900B diagonally across the keyhole 21, the axial length of the cylinder locks 1 and 1A can be suppressed even if the number of key changes increases.

[0143] The building equipment and machinery group of this embodiment is a group of building equipment and machinery composed of various building equipment and machinery with opening and closing components. The various building equipment and machinery commonly include cylindrical locks 1 and 1A. The cylindrical locks 1 and 1A include: an inner cylinder 2, which has a keyhole 21 for inserting unlocking keys 100 and 100A; an outer cylinder 3, which is rotatably fitted into the inner cylinder 2; and a key changing mechanism 9, which is arranged axially and is set to clamp the shear line between the inner cylinder 2 and the outer cylinder 3. Multiple cylindrical locks 1 and 1A with different axial lengths can be locked and unlocked by the same unlocking keys 100 and 100A.

[0144] Therefore, even though the axial lengths of the cylindrical locks 1 and 1A vary depending on the type of building equipment, the same unlocking key 100 and 100A can be used to lock and unlock various types of building equipment, thus improving the convenience of the building equipment group. The building equipment group according to this embodiment, which uses the same unlocking key to lock and unlock the opening and closing components of the cylindrical locks 1 and 1A, can use the same unlocking key to lock and unlock all the cylindrical locks in a building. Furthermore, even if the first unlocking key 100 is lost, by replacing it with the second unlocking key 100A, the second unlocking key 100A can be used immediately without replacing the cylindrical lock, thus improving both security and convenience.

[0145] In the building equipment and machinery group of this embodiment, various building equipment and machinery are respectively arranged in multiple areas A1 to A4 that are divided into different areas.

[0146] Therefore, in multiple areas A1 to A4, the same unlocking key 100 and 100A can be used to lock and unlock various building equipment and machinery, thus further improving the convenience of the building equipment and machinery group.

[0147] In the building equipment and machinery group of this embodiment, different areas A1 to A4 are divided into multiple zones with different safety levels for people entering areas A1 to A4.

[0148] Therefore, although a variety of building equipment and machinery can be locked and unlocked using the shared unlocking keys 100 and 100A, in the event of loss of the previously used unlocking key 100, the previously used unlocking key 100A can be used to render the previously used unlocking key 100 unusable in all building equipment and machinery in areas A1 to A4. Thus, even if the security levels of each area A1 to A4 are different, the security provided by the cylinder locks 1 and 1A can be maintained.

[0149] The present invention includes the cylindrical lock and building equipment assembly described in the following aspects.

[0150] <Method 1>

[0151] A cylindrical lock, comprising: The inner cylinder has a keyhole for inserting a lock key; An outer cylinder that is rotatably fitted into the inner cylinder; A key-changing mechanism, configured axially and positioned to clamp a shear line between the inner and outer cylinders, wherein... Multiple cylindrical locks with different axial lengths can be locked and unlocked using the same unlocking key.

[0152] <Method 2>

[0153] According to the cylindrical lock described in method 1, wherein... The key-changing mechanisms each have: An upper pin hole is radially disposed in the outer cylinder; The upper pin is housed in the upper pin hole in a manner that allows it to move radially. A force-applying component that applies a force to the upper pin in a radially inward direction; A lower pin hole is provided, which penetrates the inner cylinder radially; A lower pin is housed in the lower pin hole in a radially movable manner, and its front end is disposed in the keyhole in a protruding manner. An intermediate body disposed between the upper pin and the lower pin; An intermediate body storage groove is disposed in the inner cylinder and is arranged adjacent to the lower pin hole in a direction opposite to the rotation direction of the inner cylinder when unlocking.

[0154] <Method 3>

[0155] According to the cylindrical lock described in method 2, wherein... The lower pin hole has a tapered surface at the opening portion facing the outer peripheral surface of the inner cylinder, which gradually expands in diameter as it moves radially outward.

[0156] <Method 4>

[0157] According to the cylindrical lock described in method 2 or 3, wherein... A concave spherical surface is formed on the front end face of the upper pin on the radially inner side.

[0158] <Method 5>

[0159] A cylindrical lock, comprising: The inner cylinder has a keyhole for inserting a lock key; An outer cylinder that is rotatably fitted into the inner cylinder; A pin structure, arranged axially, forms a key-changing mechanism positioned to clamp a shear line between the inner and outer cylinders, wherein... It has a first pin structure column and a second pin structure column, which are respectively formed by arranging multiple pin structures along the axial direction of the cylindrical lock at a predetermined interval.

[0160] <Method 6>

[0161] According to the cylindrical lock described in method 5, wherein... The first and second pin structure rows are arranged diagonally across the keyhole and offset by half a distance axially in the cylindrical lock.

[0162] <Method 7>

[0163] A building equipment and machinery group comprises various building equipment and machinery with opening and closing components, wherein... The various building equipment and machinery mentioned above all share the common feature of cylindrical locks. The cylindrical lock has the following features: The inner cylinder has a keyhole for inserting a lock key; An outer cylinder that is rotatably fitted into the inner cylinder; A key-changing mechanism, configured axially and positioned across the shear line between the inner and outer cylinders. Multiple cylindrical locks with different axial lengths can be locked and unlocked using the same unlocking key.

[0164] <Method 8>

[0165] The building equipment and machinery assembly according to method 7, wherein... The various building equipment and machinery are respectively configured in multiple areas that are divided into different zones.

[0166] <Method 9>

[0167] The building equipment and machinery assembly according to method 8, wherein... The division into multiple different zones provides different security levels for people entering those zones.

[0168] The cylindrical lock disclosed herein is not limited to the two axial lengths described above, namely cylindrical lock 1 and cylindrical lock 1A. A cylindrical lock may have three or more axial lengths that enable locking, unlocking, and key changing using a common unlocking key.

[0169] The cylindrical lock of the present invention is not limited to the coaxial type with the keyhole 21 coaxially located at the center. The cylindrical lock can also be an eccentric type with the keyhole 21 located off-center from the central axis.

[0170] Explanation of reference numerals in the attached figures

[0171] 1. 1A: Cylindrical lock

[0172] 2: Inner cylinder

[0173] 20: Outer perimeter

[0174] 21: Keyhole

[0175] 3: Outer cylinder

[0176] 9: Key changing mechanism

[0177] 90: Pin Structure

[0178] 91: Lower pin

[0179] 91a: Front end

[0180] 92: Upstream Sales

[0181] 923: Concave spherical surface

[0182] 93: Sphere (intermediate body)

[0183] 94: Force-applying components

[0184] 95: Bottom pin hole

[0185] 96: Spherical storage slot (intermediate body storage slot)

[0186] 97: Upper pin hole

[0187] 95a: Conical surface

[0188] 900A: First pin structure column

[0189] 900B: Second Pin Structure Column

[0190] 100, 100A: Unlocking key

[0191] 200: Entrance door (building equipment and machinery)

[0192] 400: Parcel lockers (building equipment and machinery)

[0193] 500: Main gate (building equipment and machinery)

Claims

1. A cylindrical lock comprising: an inner cylinder having a keyhole for inserting a key; an outer cylinder rotatably fitted into the inner cylinder; and a key-changing mechanism axially disposed and arranged to clamp a shear line between the inner cylinder and the outer cylinder, characterized in that... Multiple cylindrical locks with different axial lengths can be locked and unlocked using the same unlocking key.

2. The cylindrical lock according to claim 1, characterized in that, The key-changing mechanisms each have: An upper pin hole is radially disposed in the outer cylinder; The upper pin is housed in the upper pin hole in a manner that allows it to move radially. A force-applying component that applies a force to the upper pin in a radially inward direction; A lower pin hole is provided, which penetrates the inner cylinder radially; A lower pin is housed in the lower pin hole in a radially movable manner, and its front end is disposed in the keyhole in a protruding manner. An intermediate body disposed between the upper pin and the lower pin; An intermediate body storage groove is disposed in the inner cylinder and is arranged adjacent to the lower pin hole in a direction opposite to the rotation direction of the inner cylinder when unlocking.

3. The cylindrical lock according to claim 2, characterized in that, The lower pin hole has a tapered surface at the opening portion facing the outer peripheral surface of the inner cylinder, which gradually expands in diameter as it moves radially outward.

4. The cylindrical lock according to claim 2 or 3, characterized in that, A concave spherical surface is formed on the front end face of the upper pin on the radially inner side.

5. A cylindrical lock comprising: an inner cylinder having a keyhole for inserting a key; an outer cylinder rotatably fitted into the inner cylinder; and a pin structure axially arranged and constituting a key-changing mechanism positioned to clamp a shear line between the inner and outer cylinders, characterized in that... It has a first pin structure column and a second pin structure column, which are respectively formed by arranging multiple pin structures along the axial direction of the cylindrical lock at a predetermined interval.

6. The cylindrical lock according to claim 5, characterized in that, The first and second pin structure rows are arranged diagonally across the keyhole and offset by half a distance axially in the cylindrical lock.

7. A building equipment and machinery assembly, comprising various building equipment and machinery having opening and closing components, characterized in that... The various building equipment and machinery mentioned above all share the common feature of cylindrical locks. The cylindrical lock comprises: an inner cylinder having a keyhole for inserting a key; an outer cylinder rotatably fitted into the inner cylinder; and a key-changing mechanism arranged axially and disposed across a shear line between the inner and outer cylinders. Multiple cylindrical locks with different axial lengths can be locked and unlocked using the same unlocking key.

8. The building equipment and machinery assembly according to claim 7, characterized in that, The various building equipment and machinery are respectively configured in multiple areas that are divided into different zones.

9. The building equipment and machinery assembly according to claim 8, characterized in that, The division into multiple different zones provides different security levels for people entering those zones.

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