Cylinder locks, building fixtures and keys

Abstract

To provide a cylinder lock, building equipment, and key with a key change mechanism that can be miniaturized. [Solution] A cylinder lock comprising an inner cylinder having a keyhole, an outer cylinder rotatably fitted to the inner cylinder, and a key change mechanism provided across the inner and outer cylinders, wherein the key change mechanism comprises an upper pinhole provided in the outer cylinder, an upper pin housed in the upper pinhole so as to be radially movable, a biasing member that biases the upper pin radially inward, a lower pinhole provided in the inner cylinder, a lower pin housed in the lower pinhole so as to be radially movable and having its tip positioned to protrude into the keyhole, a regulating member that restricts the movement of the upper pin toward the lower pin, a first inner cylinder side housing groove provided on the outer circumferential surface of the inner cylinder so as to straddle the lower pinhole and house the regulating member, a second inner cylinder side housing groove provided on the outer circumferential surface of the inner cylinder for housed a specified member during key change operation, and an outer cylinder side housing groove provided on the inner circumferential surface of the outer cylinder so as to straddle the upper pinhole and house the regulating member.

Description

Technical Field

[0001] The present disclosure relates to cylinder locks, building equipment, and keys.

Background Art

[0002] Conventionally, a cylinder lock having a key change mechanism provided with an intermediate pin between a lower pin disposed in a lower pin hole of an inner cylinder and an upper pin disposed in an upper pin hole of an outer cylinder is known (see, for example, Patent Document 1).

[0003] When a new key is inserted into the keyhole of this cylinder lock, the intermediate pin disposed in the intermediate pin storage portion of the lower pin hole of the inner cylinder is configured to be pushed by the lower pin and move to the outer cylinder side beyond the shear line. In this state, when the inserted key is rotated in the key change operation direction, the intermediate pin that has moved to the outer cylinder side is stored in an intermediate pin storage hole disposed adjacent to the original intermediate pin storage portion in the inner cylinder. As a result, the upper pin in the outer cylinder corresponding to the original intermediate pin storage portion protrudes to the inner cylinder side beyond the shear line, and thereafter, unlocking operation with the original key becomes impossible.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a conventional cylinder lock, at the time of the key change operation, in order to move the intermediate pin completely from the inner cylinder side beyond the shear line to the outer cylinder side, the upper pin hole formed in the outer cylinder needs to have a depth that allows the upper pin to move radially outward by the thickness of the intermediate pin. Therefore, the diameter of the cylinder lock increases, and enlargement is inevitable.

[0006] Therefore, the purpose of this disclosure is to provide a cylinder lock, building equipment, and key having a key change mechanism that can be miniaturized. [Means for solving the problem]

[0007] This disclosure relates to a cylinder lock comprising: an inner cylinder having a keyhole for inserting a key; an outer cylinder rotatably fitted to the inner cylinder; and a key change mechanism provided across the inner cylinder and the outer cylinder, wherein the key change mechanism includes: an upper pin hole provided in the outer cylinder; an upper pin radially movable housed in the upper pin hole; a biasing member that biases the upper pin radially inward; a lower pin hole provided in the inner cylinder; and a radially movable housed in the lower pin hole, with its tip facing forward. The present invention relates to a cylinder lock comprising: a lower pin positioned to protrude into a keyhole; a regulating member that restricts the movement of the upper pin toward the lower pin; a first inner cylinder side housing groove provided on the outer circumferential surface of the inner cylinder so as to straddle the lower pin hole and to accommodate the regulating member; a second inner cylinder side housing groove provided on the outer circumferential surface of the inner cylinder for accommodating the specified member during key change operation; and an outer cylinder side housing groove provided on the inner circumferential surface of the outer cylinder so as to straddle the upper pin hole and to accommodate the regulating member. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing the cylinder lock and key according to this embodiment. [Figure 2] This is an exploded perspective view of the cylinder lock according to this embodiment. [Figure 3] This is an exploded perspective view of the cylinder lock according to this embodiment, viewed from a different direction than Figure 2. [Figure 4] This is a front view of the cylinder lock according to this embodiment, as seen from the side where the key is inserted. [Figure 5] This is a rear view of the cylinder lock according to this embodiment, viewed from the side opposite to the key insertion side. [Figure 6] This is a cross-sectional view along line AA in Figure 4. [Figure 7] This is a front view of the cover material provided in the cylinder lock according to this embodiment. [Figure 8] This is an exploded view showing a locking / unlocking pin structure provided in a cylinder lock according to this embodiment. [Figure 9] This is an exploded view showing a pin structure for a key change mechanism provided in a cylinder lock according to this embodiment. [Figure 10] This is a side view of the inner cylinder of the cylinder lock according to this embodiment. [Figure 11] This is a perspective view showing the outer circumferential surface of the inner cylinder of the cylinder lock according to this embodiment. [Figure 12] This is a perspective view showing the outer circumferential surface of the cylinder lock according to this embodiment. [Figure 13] This diagram illustrates the arrangement relationship between the first inner cylinder side housing groove of the inner cylinder of the cylinder lock according to this embodiment and the outer cylinder side housing groove of the outer cylinder. [Figure 14] This is a cross-sectional view showing the key change mechanism array in a cylinder lock according to this embodiment. [Figure 15] This is a diagram showing the engagement groove of a key. [Figure 16] This is a cross-sectional view showing the key change mechanism in a cylinder lock according to this embodiment, before the key is inserted. [Figure 17] This is a cross-sectional view illustrating the operation of the key change mechanism in the cylinder lock according to this embodiment. [Figure 18] This is a cross-sectional view illustrating the operation of the key change mechanism in the cylinder lock according to this embodiment. [Figure 19] This is a cross-sectional view illustrating the operation of the key change mechanism in the cylinder lock according to this embodiment. [Figure 20] This is a cross-sectional view illustrating the operation of the key change mechanism in the cylinder lock according to this embodiment. [Figure 21] This is a cross-sectional view illustrating the operation of the key change mechanism in the cylinder lock according to this embodiment. [Figure 22] This is a cross-sectional view illustrating the operation of the key change mechanism in the cylinder lock according to this embodiment. [Figure 23]It is a plan view showing a first inner cylinder side accommodation groove and a second inner cylinder side accommodation groove of an inner cylinder in a cylinder lock according to another embodiment. [Figure 24] It is a front view showing an entrance door provided with a cylinder lock according to this embodiment. [Figure 25] It is a front view showing a delivery box provided with a cylinder lock according to this embodiment. [Figure 26] It is a front view showing a door leaf provided with a cylinder lock according to this embodiment. [Figure 27] It is a conceptual diagram for unlocking and locking a plurality of types of building facilities with the same key. [Figure 28] It is a conceptual diagram for key change of a plurality of types of building facilities with the same key.

Embodiments for Carrying out the Invention

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The cylinder lock 1 according to this embodiment is used together with a plurality of unlocking keys which are keys capable of unlocking and locking the cylinder lock 1. In the cylinder lock 1 according to this embodiment, eight unlocking keys from the first to the eighth can be used, but in FIG. 1, only one unlocking key 100 out of the eight unlocking keys is shown.

[0010] As shown in FIGS. 2 and 3, the cylinder lock 1 has an inner cylinder 2, an outer cylinder 3, a pin structure 4 for unlocking and locking, a click pin 5, a pair of lid members 6, an inner and outer cylinder fixing pin 7, and a pin structure 8 for a key change mechanism.

[0011] In the cylinder lock 1 of this embodiment, the locking / unlocking pin structure 4 is arranged in multiples along the axial direction of the cylinder lock 1 to form a row of pin structures, and four such rows are arranged so that they are positioned diagonally opposite each other across the keyhole 21. The key change mechanism pin structure 8 is arranged in multiples along the axial direction of the cylinder lock 1 to form a row of pin structures, and two such rows are arranged so that they are positioned diagonally opposite each other across the keyhole 21. However, in Figures 2 and 3, only two of each of the locking / unlocking pin structure 4 and the key change mechanism pin structure 8 are shown to facilitate understanding of the structure.

[0012] Here, we define the directions in each figure. The X1-X2 directions indicated by the arrows at both ends in the figures represent the direction along the central axis J of the cylinder lock 1. This direction along the central axis J coincides with the axial direction of the inner cylinder 2 and the outer cylinder 3. X1 indicates the front side of the cylinder lock 1, and X2 indicates the rear side of the cylinder lock 1. For example, if the cylinder lock 1 is installed on a front door, the front side X1 is the exterior side, and the rear side X2 is the interior side.

[0013] As shown in Figures 2 and 3, the inner cylinder 2 is a substantially cylindrical member that rotatably fits into the outer cylinder 3. The material of the inner cylinder 2 is not particularly limited, but it is made of a metal such as brass. The inner cylinder 2 fits inside the outer cylinder 3. The inner cylinder 2 has a cylindrical keyhole 21 formed along its axial direction, into which the unlocking key 100 can be inserted.

[0014] As shown in Figures 2 and 3, multiple cylindrical pinholes 22 are formed on the outer circumferential surface 20 of the inner cylinder 2, each communicating with a keyhole 21. The pinholes 22 are holes through which the tumbler pins 42 and at least a portion of the driver pins 41 of the locking / unlocking pin structure 4 can be inserted and removed. As shown in Figure 11, an annular stepped portion 22a is formed on the inner circumferential surface of the pinhole 22. As a result, the pinhole 22 is formed with a smaller diameter radially inward from the stepped portion 22a. In this embodiment, multiple pinholes 22 are arranged along the axial direction of the inner cylinder 2 to form a row of pinholes, and four rows of pinholes are arranged so that they are positioned diagonally opposite each other, straddling the keyhole 21.

[0015] As shown in Figures 2, 3, and 6, a plurality of fitting holes 23 communicating with the keyhole 21 are formed on the outer circumferential surface 20 at the rear end X2 of the inner cylinder 2, at predetermined intervals in the circumferential direction. In this embodiment, four fitting holes 23 are formed on the outer circumferential surface 20 of the inner cylinder 2. The inner circumferential surface of the fitting hole 23 on the keyhole 21 side is formed to be smaller in diameter. As a result, as shown in Figure 6, an annular stepped portion 23a is formed on the inner circumferential surface of the fitting hole 23.

[0016] A drive pin 24 is inserted into each of the four fitting holes 23. As shown in Figures 2, 3, and 6, the drive pin 24 has a large diameter portion 241, a small diameter portion 242, and a drive end portion 243, arranged in order along the axial direction of the drive pin 24 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 toward the keyhole 21. In this state, the drive end portion 243 is positioned to protrude 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 from the outer circumferential surface 20 of the inner cylinder 2. The drive ends 243 of the four drive pins 24 engage with four drive engagement grooves 101 formed on the tip of the unlocking key 100, which is inserted into the keyhole 21 as described later. As a result, the four drive pins 24 rotate the inner cylinder 2 relative to the outer cylinder 3 in conjunction with the rotation operation of the unlocking key 100.

[0017] As shown in Figures 2, 3, and 5, a recess 25 is formed on the outer circumferential surface 20 at the rear end X2 of the inner cylinder 2, into which a click pin 5, described later, is fitted. The recess 25 extends along the axial direction of the inner cylinder 2. As shown in Figure 5, the width of the recess 25 along the circumferential direction of the outer circumferential surface 20 of the inner cylinder 2 is smaller than the outer diameter of the cylindrical click pin 5.

[0018] As shown in Figures 2 and 3, the outer cylinder 3 is a substantially cylindrical member into which the inner cylinder 2 can be fitted. The material of the outer cylinder 3 is not particularly limited, but for example, it is made of a metal such as brass, similar to the inner cylinder 2. The outer cylinder 3 is fixed to a door (not shown) to which the cylinder lock 1 is attached, so as not to rotate. The outer cylinder 3 fits into the inner cylinder 2 by bringing its inner circumferential surface, which is the sliding surface with the inner cylinder 2, into contact with 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. As a result, as shown in Figure 6, the inner cylinder 2, when fitted into the outer cylinder 3 with its front side X1 aligned, protrudes from the outer cylinder 3 toward the rear side X2. The portion of the inner cylinder 2 that protrudes from the outer cylinder 3 toward the rear side X2 is used for connection to a functional component of the cylinder lock 1 (not shown).

[0019] The outer cylinder 3 has a cylindrical hole 31 formed along the axial direction of the outer cylinder 3 into which the inner cylinder 2 can be fitted. Multiple cylindrical pin holes 32 are formed on the outer circumferential surface 30a of the outer cylinder 3, communicating with the hole 31. The pin holes 32 are holes into which the driver pin 41 and at least a portion of the tumbler pin 42 of the locking / unlocking pin structure 4 can be inserted and removed. The multiple pin holes 32 of the outer cylinder 3 are arranged to communicate with the multiple pin holes 22 of the inner cylinder 2. In this embodiment, the multiple pin holes 32 are arranged along the axial direction of the outer cylinder 3 to form a row of pin holes, and four rows of pin holes are arranged so that they are positioned diagonally opposite each other with respect to the keyhole 21, similar to the pin holes of the inner cylinder 2. The multiple pin holes 22 of the inner cylinder 2 and the multiple pin holes 32 of the outer cylinder 3 are provided to communicate with each other radially when the inner cylinder 2 is rotated relative to the outer cylinder 3 and positioned in a predetermined position.

[0020] As shown in Figures 2 to 5, a cover mounting groove 33 is provided on the outer circumferential surface 30a of the outer cylinder 3, extending in the axial direction. The cover mounting groove 33 has a substantially rectangular shape in cross-section and opens toward the outer circumferential surface 30a of the outer cylinder 3. The cover mounting groove 33 is formed from the front end face X1 to the rear end face X2 of the outer cylinder 3. In this embodiment, two cover mounting grooves 33 are provided on the outer circumferential surface 30a of the outer cylinder 3. As shown in Figures 4 and 5, the two cover mounting grooves 33 are spaced apart at a 180-degree angle in the circumferential direction of the outer circumferential surface 30a of the outer cylinder 3. The two cover mounting grooves 33 are configured to engage with the bent portion 62 of the cover material 6, which will be described later.

[0021] As shown in Figures 2, 3, and 5, a notch 34 is formed along the axial direction at the rear end X2 of the outer cylinder 3. The notch 34 is positioned to communicate with the recess 25 of the inner cylinder 2. The notch 34 is formed by cutting out the outer circumferential surface 30a in a substantially rectangular parallelepiped shape in plan view, from the end face of the rear end X2 of the outer cylinder 3 toward the front end X1. The hole 31 communicates with the radially outer side of the outer cylinder 3 at the notch 34. The width and length of the notch 34 are approximately equal to the outer diameter and axial length of the cylindrical click pin 5.

[0022] The locking and unlocking pin structure 4 functions when the cylinder lock 1 is locked and unlocked by the normal operation of the unlocking key 100. As shown in Figure 8, this pin structure 4 consists of a driver pin 41 located in the outer cylinder 3, a tumbler pin 42 located in the inner cylinder 2, and a biasing member 43.

[0023] The driver pin 41 is a cylindrical metal body having a large diameter portion 41a and a small diameter portion 41b. The driver pin 41 is slidably housed in the pin hole 32 of the outer cylinder 3 with the large diameter portion 41a positioned towards the lid material 6 and the small diameter portion 41b positioned towards the inner cylinder 2. A recess 41c for housing the biasing member 43 is formed in the large diameter portion 41a.

[0024] The tumbler pin 42 is made of a cylindrical metal body having a large diameter portion 42a, a small diameter portion 42b, and a conical portion 42c. The tumbler pin 42 is housed in the pin hole 22 of the inner cylinder 2 so as to be slidable in the radial direction of the inner cylinder 2, with the large diameter portion 42a positioned towards the outer cylinder 3 and the conical portion 42c, which contacts the unlocking key 100, positioned towards the keyhole 21.

[0025] The biasing member 43 is made of a coil spring and is positioned between the recess 41c of the driver pin 41 and the cover material 6. The biasing member 43 biases the tumbler pin 42 toward the keyhole 21 via the driver pin 41. At this time, the tumbler pin 42 is positioned in the pinhole 22 such that the large diameter portion 42a abuts against the stepped portion 22a of the pinhole 22 and the conical portion 42c protrudes into the keyhole 21. Note that the locking and unlocking pin structure 4 in the cylinder lock 1 is a known structure and is therefore omitted from the illustration in Figures 6 and 10 onward.

[0026] The click pin 5 is a member that suppresses the rotation of the inner cylinder 2 relative to the outer cylinder 3 when the rotational state of the inner cylinder 2 relative to the outer cylinder 3 is such that the unlocking key 100 can be inserted into or removed from the keyhole 21. The click pin 5 is cylindrical in shape. The axial direction of the click pin 5 is aligned with the axial direction of the inner cylinder 2 and the outer cylinder 3. A constricted portion 5a is formed around the entire circumference of the axial center of the click pin 5. As shown in Figure 5, the click pin 5 is positioned to fit into the recess 25 of the inner cylinder 2 when the inner cylinder 2 and the outer cylinder 3 are fitted together, and is completely housed within the notch 34 of the outer cylinder 3. The click pin 5 within the notch 34 does not protrude radially outward from the outer peripheral surface 30a of the outer cylinder 3.

[0027] The click pin 5 housed within the notch 34 is biased toward the inner cylinder 2 by an arc-shaped torsion spring 51 acting as a biasing member. The torsion spring 51 is mounted in a spring mounting groove 35 formed circumferentially on the outer peripheral surface 30a at the rear end X2 of the outer cylinder 3. The two ends 51a of the torsion spring 51 are locked into spring locking grooves 36 formed on the outer peripheral surface 30a of the outer cylinder 3. The torsion spring 51 mounted in the spring mounting groove 35 engages with the constricted portion 5a of the click pin 5, applying a biasing force from the radially outside of the outer cylinder 3.

[0028] In the state shown in Figure 5, the click pin 5 in the notch 34 of the outer cylinder 3 is fitted into the recess 25 of the inner cylinder 2. At this time, rotation of the inner cylinder 2 relative to the outer cylinder 3 is suppressed, and the click sensation when the click pin 5 fits into the recess 25 is transmitted to the fingers of the user who is turning the unlocking key 100. As a result, the user can recognize the position in which the unlocking key 100 can be inserted and removed, and can easily maintain the rotational state of the inner cylinder 2 relative to the outer cylinder 3 in the insertion and removal position. The torsion spring 51 that biases the click pin 5 engages with the constricted portion 5a of the click pin 5 and is mounted in 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.

[0029] The cover material 6 is attached along the outer circumferential surface 30a of the outer cylinder 3, thereby covering the multiple pin holes 32 and the inner and outer cylinder fixing pins 7 that open to the outer circumferential surface 30a. The cover material 6 is attached to the outer cylinder 3 against the biasing force of the biasing member 43 that applies a biasing force to the driver pins 41. As a result, the driver pins 41 are housed in the pin holes 32, and a biasing force is applied radially inward to the outer cylinder 3. By covering the multiple pin holes 32 of the outer cylinder 3 with the cover material 6, the space required for the groove portion to fix the cover material can be reduced compared to a cover material that covers the pin holes of the driver pins one row at a time. This makes it possible to reduce the diameter of the outer cylinder 3. As shown in Figures 1 and 6, the rear end X2 of the cover material 6 does not cover the spring mounting groove 35.

[0030] In this embodiment, two lid materials 6 are provided on the outer cylinder 3. The two lid materials 6 are combined to form a substantially cylindrical shape on the outer circumferential surface 30a of the outer cylinder 3. By providing multiple lid materials 6, the assembly workability of the cylinder lock 1 can be improved compared to the case in which a single cylindrical lid material is used. It is preferable to use spring steel as the material for the lid material 6. This makes it possible to tightly seal the lid material 6 and the outer cylinder 3 without any gaps. It is especially preferable to use stainless steel spring steel. Specifically, SUS304CSP can be mentioned.

[0031] As shown in Figure 7, the cover material 6 has a curved portion 61 which is a flat plate curved along the outer circumferential surface 30a 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 roughly semi-circular cross-sectional shape. The bent portions 62 are located at both ends in the direction of the curvature of the curved portion 61 and are each bent toward the inside of the curved portion 61. The two cover materials 6, 6 are positioned symmetrically with respect to the central axis J of the cylinder lock 1.

[0032] The two lid materials 6 are attached to the outer surface 30a of the outer cylinder 3 by engaging their respective bent portions 62 with two lid material mounting grooves 33, 33 formed on the outer surface 30a of the outer cylinder 3. The curved portion 61 of the lid material 6 is curved inward with a curvature greater than the curvature of the outer surface 30a of the outer cylinder 3 before the lid material 6 is attached to the outer cylinder 3. Therefore, when the lid material 6 is attached to the outer cylinder 3, the spring force exerted by the curved portion 61 firmly engages the bent portion 62 with the lid material mounting grooves 33, and the curved portion 61 is in close contact with the outer cylinder 3.

[0033] Next, the axial retaining structure between the inner cylinder 2 and the outer cylinder 3 in the cylinder lock 1 of this embodiment will be described.

[0034] As shown in Figures 2, 3, and 6, a fixing pin insertion groove 26 extending in the circumferential direction is formed on the outer circumferential surface 20 of the inner cylinder 2. As shown in Figure 6, the fixing pin insertion groove 26 is a rectangular cross-section groove of the same width recessed in the axial direction from the outer circumferential surface 20 of the inner cylinder 2 toward the keyhole 21. In this embodiment, the fixing pin insertion groove 26 is located at the front end X1 of the inner cylinder 2 and is formed in an annular shape by machining the outer circumferential surface 20 over its entire circumference. The locking / unlocking pin structure 4 and the key change mechanism pin structure 8 are arranged on the rear side X2 of the fixing pin insertion groove 26.

[0035] As shown in Figures 2, 3, and 6, a cylindrical fixing pin insertion hole 37 is formed on the outer circumferential surface 30a at the front end 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 is in communication with the hole portion 31. In this embodiment, the outer cylinder 3 has four fixing pin insertion holes 37 formed along the circumferential direction of the outer cylinder 3. As shown in Figures 1 to 3 and 6, the front end X1 6a of one of the lid materials 6 covers two of the fixing pin insertion holes 37, 37.

[0036] As shown in Figure 6, the inner diameter of the fixing pin insertion hole 37 is larger than the groove width of the fixing pin insertion groove 26 which runs 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 hole 37 faces the fixing pin insertion groove 26 and the stepped portions 26a which are located on the front side X1 and the rear side X2 of the fixing pin insertion groove 26, respectively. The stepped portions 26a are formed by a part of the outer circumferential surface 20 of the inner cylinder 2.

[0037] The outer cylinder 3 has two fixing pin insertion holes 37, each forming a pair. Two pairs of fixing pin insertion holes 37 are arranged along the circumferential direction of the outer cylinder 3, flanking the cover mounting groove 33. As shown in Figure 4, the angle θ at which the central axes 37a of each pair of fixing pin insertion holes 37 intersect 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, which are 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 not 180 degrees, but for example, it can be set to 30 degrees.

[0038] At least two of the multiple fixing pin insertion holes 37 can be used to insert inner and outer cylinder fixing pins 7. In this embodiment, two metal inner and outer cylinder fixing pins 7 are inserted into two fixing pin insertion holes 37 that constitute one set of four fixing pin insertion holes 37. As shown in Figures 4 and 6, the inner and outer cylinder fixing pins 7 have a cylindrical large-diameter portion 71 and a positioning end portion 72, respectively, arranged in order from the radially outer side of the outer cylinder 3 along the axial direction of the inner and outer cylinder fixing pin 7. The outer diameter of the large-diameter portion 71 is less than or equal to the inner diameter of the fixing pin insertion hole 37 and greater 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 portion 72 is smaller than the outer diameter of the large-diameter portion 71 and less than or equal to the groove width of the fixing pin insertion groove 26 along the axial direction of the inner cylinder 2. The inner and outer cylinder fixing pins 7 in this embodiment are fixing pins that restrict and fix the axial movement of the inner cylinder 2 so that the inner cylinder 2 does not come out of the outer cylinder 3 in the axial direction.

[0039] The axial length of the inner and outer cylinder fixing pin 7 is greater than the axial length of the fixing pin insertion hole 37. More specifically, the length of the large diameter portion 71 of the inner and outer cylinder fixing pin 7 in the axial direction is shorter than the axial length of the fixing pin insertion hole 37. The length of the positioning end portion 72 of the inner and outer cylinder fixing pin 7 in the axial direction is less than or equal to the depth of the fixing pin insertion groove 26 of the inner cylinder 2.

[0040] When the inner and outer cylinder fixing pin 7 is inserted into the fixing pin insertion hole 37 from the radially outside of the outer cylinder 3, with the positioning end 73 leading, the large diameter portion 71 of the inner and outer cylinder fixing pin 7 abuts against the stepped portion 26a facing into the fixing pin insertion hole 37, preventing further insertion. In this state, the positioning end 72 of the inner and outer cylinder fixing pin 7 penetrates 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, as shown in Figures 4 and 6. As a result, the inner cylinder 2 is fitted into the hole 31 of the outer cylinder 3 in a state where it cannot be axially dislodged relative to the outer cylinder 3. The positioning end 73 of the inner and outer cylinder fixing pin 7 is movable in the circumferential direction 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.

[0041] The inner cylinder 2 is positioned so that it cannot be dislodged in the axial direction by an inner / outer cylinder fixing pin 7 inserted from the radial outside of the outer cylinder 3, so there is no need for the inner cylinder 2 to sandwich the outer cylinder 3 from both sides in the axial direction. Since the axial lengths of the inner cylinder 2 and outer cylinder 3 can be made as short as possible, the cylinder lock 1 can be made smaller.

[0042] In this state where the inner cylinder 2 and outer cylinder 3 are fitted together, the tolerance relationships are three: 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 inner and outer cylinder fixing pin 7. Of these, all but the inner diameter of the hole 31 in the outer cylinder 3 are machined on the outer circumference by a machine tool that cuts the fixing pin insertion groove 26 and the inner and outer cylinder fixing pin 7, so high-precision machining can be achieved. As a result, the amount of axial displacement 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, it is possible to reduce the diameter of the cylinder lock 1.

[0043] As shown in Figures 1 to 4 and Figure 6, the two inner and outer cylinder fixing pins 7 inserted into the two fixing pin insertion holes 37 are covered by the front end X1 6a of one of the cover materials 6. This prevents the inner and outer cylinder fixing pins 7, 7 from coming out of the outer cylinder 3 due to their own weight without increasing the diameter of the cylinder lock 1.

[0044] Since the central axes 37a of the two fixing pin insertion holes 37 intersect at an angle θ of 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 of less than 180 degrees. As a result, the inner cylinder 2 does not wobble in the direction of rotation around the central axis 7a of the inner and outer cylinder fixing pins 7 relative to the outer cylinder 3.

[0045] The axial positioning and retention of the inner cylinder 2 and outer cylinder 3 are completed simply by inserting the inner and outer cylinder fixing pin 7 into the fixing pin insertion hole 37 from the radial outside of the outer cylinder 3 and holding it down with the cover material 6, thus simplifying the fitting operation of the inner cylinder 2 and outer cylinder 3.

[0046] In the above embodiment, the inner and outer cylinder fixing pins 7 are inserted into two fixing pin insertion holes 37 that constitute one set 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 may be configured such that the two inner and outer cylinder fixing pins 7 are inserted into any two of the four fixing pin insertion holes 37, provided that they are not arranged at a 180-degree angle in the circumferential direction of the outer cylinder 3. The fixing pins may also be inserted into all four fixing pin insertion holes 37.

[0047] Next, the key change mechanism 9 of this embodiment will be described. The key change mechanism 9 is composed of a lower pin hole 91, a first inner cylinder side housing groove 92 and a second inner cylinder side housing groove 93 provided in the inner cylinder 2, an upper pin hole 94 and an outer cylinder side housing groove 95 provided in the outer cylinder 3, and a pin structure 8, and these are provided across the inner cylinder 2 and the outer cylinder 3. At least one key change mechanism 9 is provided in the cylinder lock 1. Multiple key change mechanisms 9 of this embodiment are provided in the cylinder lock 1 along the axial direction of the cylinder 1. The configurations of each of the multiple key change mechanisms 9 may be the same. That is, the lower pin hole 91, the first inner cylinder side housing groove 92 and the second inner cylinder side housing groove 93, the upper pin hole 94 and the outer cylinder side housing groove 95, and the pin structure 8 may all have the same configuration.

[0048] As shown in Figures 2, 3, 10, and 11, multiple lower pin holes 91 are formed along the axial direction of the inner cylinder 2. The lower pin holes 91 have a cylindrical shape that penetrates the inner cylinder 2 radially and communicates with the keyhole 21. The lower pin holes 91 are holes that accommodate the lower pin 82 of the pin structure 8.

[0049] All lower pin holes 91 are identical in shape and are formed to the same diameter and shape as the pin holes 22 that house the locking and unlocking tumbler pins 42. As shown in Figures 10, 11, and 14, an annular stepped portion 91a is formed on the inner circumferential surface of the lower pin hole 91. As a result, the lower pin hole 91 is formed to have a smaller diameter radially inward from the stepped portion 91a.

[0050] The first inner cylinder side accommodating groove 92 is a groove capable of accommodating the regulating member 84 of the pin structure 8 for the key change mechanism, described later, and one groove is provided for each lower pin hole 91, independently along the axial direction of the inner cylinder 2. The length of the first inner cylinder side accommodating groove 92 along the axial direction of the inner cylinder 2 is greater than the diameter of the lower pin hole 91, but the width of the first inner cylinder side accommodating groove 92 along the circumferential direction of the inner cylinder 2 is smaller than the diameter of the lower pin hole 91. As shown in Figures 10 and 11, the first inner cylinder side accommodating groove 92 is provided along the axial direction of the inner cylinder 2 so as to straddle the lower pin hole 91. Therefore, the first inner cylinder side accommodating groove 92 is formed by recessing it in the outer circumferential surface 20 of the inner cylinder 2 at two locations along the axial direction of the inner cylinder 2 at the opening edge of the lower pin hole 91. The depth of the first inner cylinder side housing groove 92 is such that it can completely accommodate the regulating member 84 described later, and is approximately equal to the outer diameter of the regulating member 84.

[0051] The second inner cylinder side housing groove 93, like the first inner cylinder side housing groove 92, is a groove capable of housing the regulating member 84 described later, and one is provided on the outer circumferential surface 20 of the inner cylinder 2, near each lower pin hole 91, independently along the axial direction of the inner cylinder 2. More specifically, the second inner cylinder side housing groove 93 is positioned parallel to the first inner cylinder side housing groove 92 on the side opposite to the direction of rotation of the inner cylinder 2 when unlocked by the unlocking key 100 with respect to the lower pin hole 91, and is recessed in the outer circumferential surface 20 of the inner cylinder 2. The length, width, and depth of the second inner cylinder side housing groove 93 are the same as those of the first inner cylinder side housing groove 92.

[0052] As shown in Figures 2, 3, and 12, the upper pin holes 94 are formed in the outer cylinder 3 in the same number as the lower pin holes 91 of the inner cylinder 2. The upper pin holes 94 have a cylindrical shape that penetrates the outer cylinder 3 radially and communicates with the lower pin holes 91 of the inner cylinder 2. The upper pin holes 94 are holes that accommodate the upper pin 81 of the pin structure 8.

[0053] The outer cylinder side housing grooves 95 are grooves capable of accommodating the regulating member 84 described later, and one is provided for each upper pin hole 94, independently along the axial direction of the outer cylinder 3. The length and width of the outer cylinder side housing grooves 95 along the axial direction of the outer cylinder 3 are the same as the first inner cylinder side housing groove 92 and the second inner cylinder side housing groove 93 provided in the inner cylinder 2. As shown in Figure 12, the outer cylinder side housing grooves 95 are provided along the axial direction of the outer cylinder 3, straddling the upper pin holes 94. Therefore, the outer cylinder side housing grooves 95 are located at two locations along the axial direction of the outer cylinder 3 in the upper pin holes 94. In this embodiment, the outer cylinder side accommodating groove 95 is formed as a vertical groove extending along the entire axial length of the upper pin hole 94 at two opposing locations on the inner wall surface of the upper pin hole 94. However, the outer cylinder side accommodating groove 95 may also be recessed in the same manner as the first inner cylinder side accommodating groove 92 at the opening edge of the upper pin hole 94 that opens into the inner circumferential surface 30b of the outer cylinder 3.

[0054] As shown in Figure 13, the center position of the first inner cylinder side housing groove 92, which is aligned with the axial direction of the inner cylinder 2, and the center position of the outer cylinder side housing groove 95, which is aligned with the axial direction of the outer cylinder 3, are located on the same axial position CT of the cylinder lock 1. Therefore, when the inner cylinder 2 rotates and the lower pin hole 91 and the upper pin hole 94 communicate radially, the first inner cylinder side housing groove 92 and the outer cylinder side housing groove 95 also overlap and communicate radially. Although not shown, the center position of the second inner cylinder side housing groove 93, which is aligned with the axial direction of the inner cylinder 2, is also located on the same axial position CT of the cylinder lock 1.

[0055] Unlike the pin structure 4 for locking and unlocking, the pin structure 8 for the key change mechanism functions through the key change operation. As shown in Figure 9, the pin structure 8 consists of an upper pin 81 located in the outer cylinder 3, a lower pin 82 located in the inner cylinder 2, a biasing member 83, and a regulating member 84. Multiple pin structures 8 are arranged along the axial direction of the cylinder lock 1, spanning the inner cylinder 2 and the outer cylinder 3, specifically across the shear line formed between the inner cylinder 2 and the outer cylinder 3.

[0056] The upper pin 81 consists of a cylindrical metal body having a large diameter portion 81a and a small diameter portion 81b. The upper pin 81 is housed in the upper pin hole 94 of the outer cylinder 3 so as to be radially movable, with the large diameter portion 81a positioned towards the lid material 6 and the small diameter portion 81b positioned towards the inner cylinder 2. A recess 81c for housing the biasing member 83 is formed in the large diameter portion 81a. As shown in Figures 16 to 22, the outer circumferential surface 81b1 of the small diameter portion 81b positioned on the inner cylinder 2 side of the upper pin 81 is similar in shape to the inner circumferential surface 91b of the lower pin hole 91 of the inner cylinder 2. The inner circumferential surface 91b of the lower pin hole 91 is the inner circumferential surface of the large diameter portion radially outward of the inner cylinder 2 from the stepped portion 91a of the lower pin hole 91. More specifically, the outer circumferential surface 81b1 of the small diameter portion 81b of the upper pin 81 is a surface parallel to the inner circumferential surface 91b of the lower pin hole 91 with respect to the biasing direction of the upper pin 81 toward the radially inward direction of the outer cylinder 3 of the upper pin 81 by the biasing member 83 described later. The upper pin 81 can be the same as the driver pin 41 of the locking / unlocking pin structure 4.

[0057] The lower pin 82 is a cylindrical metal body having a large diameter portion 82a, a small diameter portion 82b, and a conical portion 82c. The lower pin 82 is housed in the lower pin hole 91 of the inner cylinder 2 so as to be movable in the radial direction of the inner cylinder 2, with the large diameter portion 82a positioned towards the outer cylinder 3 and the conical portion 82c, which contacts the unlocking key 100, positioned towards the keyhole 21. The lower pin 82 is positioned in the lower pin hole 91 such that the large diameter portion 82a contacts the stepped portion 91a of the lower pin hole 91, and the conical portion 82c at its tip protrudes into the keyhole 21.

[0058] The biasing member 83 is made of a coil spring and is positioned between the recess 81c of the upper pin 81 and the cover material 6. The biasing member 83 biases the upper pin 81 radially inward toward the inner cylinder 2.

[0059] The restricting member 84 is positioned between the upper pin 81 and the lower pin 82, restricting the upper pin 81 from moving radially inward toward the lower pin hole 91 of the inner cylinder 2. The restricting member 84 in this embodiment has an elongated cylindrical shape. The restricting member 84 consists of a long, metal pin member (rod-shaped body). One restricting member 84 is independently positioned in each pin structure 8. As shown in Figure 14, in the state of the cylinder lock 1 before a key change has been performed, the restricting members 84 are each housed in the first inner cylinder side housing groove 92 of the inner cylinder 2, positioned between the upper pin 81 and the lower pin 82, with their length direction aligned with the axial direction of the cylinder lock 1. Figures 10 and 11 show the restricting member 84 housed in the first inner cylinder side housing groove 92. The restricting member 84 housed in the first inner cylinder side housing groove 92 is positioned so that its length direction is aligned with the axial direction of the cylinder lock 1.

[0060] The axial length of the regulating member 84 itself is longer than the diameters of the upper pin hole 94 and the lower pin hole 91, as shown in Figure 13. The regulating member 84 is positioned to straddle the lower pin hole 91 by being housed in the first inner cylinder side housing groove 92 of the inner cylinder 2, as shown in Figures 10, 11, 13, and 14.

[0061] As shown in Figures 14 and 16, the regulating member 84 housed in the first inner cylinder side housing groove 92 of the inner cylinder 2 abuts against the upper pin 81, which is biased by the biasing member 83 within the upper pin hole 94, thereby preventing the upper pin 81 from moving toward the lower pin hole 91. In this state, a predetermined clearance CL is formed between the lower pin 82, whose large diameter portion 82a abuts against the stepped portion 91a of the lower pin hole 91, and the regulating member 84, as shown in Figure 16. Within the range of this clearance CL, the lower pin 82 can move freely along the radial direction of the inner cylinder 2 within the lower pin hole 91.

[0062] As shown in Figure 14, in the cylinder lock 1, multiple key change mechanisms 9 are arranged along the axial direction to form a row of key change mechanisms 90. In this embodiment, the cylinder lock 1 has two rows of key change mechanisms 90A and 90B, spaced apart in the circumferential direction of the cylinder lock 1. In the cross-section of the cylinder lock 1 shown in Figure 14, the upper row of key change mechanisms 90A has four key change mechanisms 9 arranged along the axial direction of the cylinder lock 1, and the lower row of key change mechanisms 90B has three key change mechanisms 9 arranged along the axial direction of the cylinder lock 1. The two rows of key change mechanisms 90A and 90B are positioned diagonally opposite each other, 180 degrees apart in the circumferential direction of the cylinder lock 1, with the keyhole 21 in between. Therefore, the cylinder lock 1 of this embodiment can perform seven key changes through the operation of seven key change mechanisms 9. The two rows of key change mechanisms 90A and 90B are positioned diagonally opposite each other across the keyhole 21, so even if multiple key change mechanisms 9 are provided in the cylinder lock 1, the axial length of the cylinder lock 1 will not increase. The key change mechanisms 9 in the two rows of key change mechanisms 90A and 90B are offset by half a pitch in the axial direction of the cylinder lock 1. This further suppresses the increase in the axial length of the cylinder lock 1, making it possible to miniaturize the cylinder lock.

[0063] Next, the unlocking key 100 will be described with reference to Figures 1 and 15. The unlocking key 100 consists of a cylindrical rod-shaped body. The unlocking key 100 has a plurality of drive engagement grooves 101, a locking / unlocking engagement groove 102, and a key change engagement groove 103. Since the cylinder lock 1 of this embodiment allows for 7 key changes, a set of 8 unlocking keys 100, from the 1st key to the 8th key, is used for one cylinder lock 1.

[0064] Multiple drive engagement grooves 101 are formed on the outer circumferential surface of the tip of the unlocking key 100. The arrangement of the multiple drive engagement grooves 101 corresponds to the circumferential arrangement of the drive ends 243 of the multiple drive pins 24 facing the keyhole 21 of the inner cylinder 2.

[0065] The locking / unlocking engagement groove 102 is formed on the outer circumferential surface of the unlocking key 100, along the axial direction of the unlocking key 100. The locking / unlocking engagement groove 102 corresponds to the arrangement of multiple tumbler pins 42 provided in the cylinder lock 1. By engaging the locking / unlocking engagement groove 102, the tumbler pins 42 align with the shear line between the driver pins 41 and tumbler pins 42 of the multiple locking / unlocking pin structure 4, respectively. 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.

[0066] At least one key change engagement groove 103 is formed on the outer circumferential surface of the unlocking key 100, along the axial direction of the unlocking key 100. In this embodiment, two key change engagement grooves 103, 103 are formed on the outer circumferential surface of the unlocking key 100, corresponding to two rows of key change mechanism rows 90A, 90B, and are spaced 180 degrees apart in the circumferential direction. When the lower pin 82 engages with the key change engagement groove 103, its large diameter portion 82a comes into contact with the stepped portion 91a of the lower pin hole 91, causing it to protrude most towards the keyhole 21. In this case, the shear line in the key change mechanism 9 is positioned between the upper pin 81 and the regulating member 84 in the first inner cylinder side housing groove 92 (see Figure 16). When the lower pin 82 does not engage with the key change engagement groove 103, the lower pin 82 moves radially outward, pushing the regulating member 84 in the first inner cylinder side housing groove 92 towards the outer cylinder 3. In this case, the shear line in the key change mechanism 9 is positioned between the regulating member 84 and the lower pin 82 in the outer cylinder side housing groove 95 (see Figure 17).

[0067] The length of the key change engagement groove 103 along the axial direction of the unlocking key 100 differs for each of the multiple unlocking keys 100 used in the cylinder lock 1. Specifically, since the cylinder lock 1 of this embodiment can use a set of eight unlocking keys 100 from key 1 to key 8, when the unlocking key 100 is key 1, which is used first in the cylinder lock 1 (key 1 is a key that does not undergo a key change), the key change engagement groove 103 is formed to a length that can engage with the lower pins 82 of all the key change mechanisms 9 formed in the cylinder lock 1. On the other hand, when the unlocking key 100 is one of the keys from key 2 to key 8 that undergoes a key change, the length of the key change engagement groove 103 is formed to gradually shorten from key 2 to key 8 so that it no longer engages with the lower pins 82 of any one of the multiple key change mechanisms 9 formed in the cylinder lock 1. Normally, when performing a key change, the key change engagement groove 103 of the unlocking key 100 is formed so that it sequentially disengages one pitch at a time, from the lower pin 82 of the key change mechanism 9 located on the front side X1 of the cylinder lock 1 to the lower pin 82 of the key change mechanism 9 located on the rear side X2.

[0068] Next, the operation of the cylinder lock 1 when a key change is performed using an unlocking key will be explained with reference to Figures 16 to 22.

[0069] Figure 16 shows the state in which an unlocking key 100A (e.g., key 1) that does not perform a key change is inserted into the keyhole 21. The conical portion 82c of the lower pin 82 of the pin structure 8 in the key change mechanism 9 is engaged with the key change engagement groove 103 of the unlocking key 100A. The large diameter portion 82a of the lower pin 82 abuts against the stepped portion 91a of the lower pin hole 91, and the lower pin 82 protrudes furthest into the keyhole 21. The regulating member 84 is housed in the first inner cylinder side housing groove 92 of the inner cylinder 2 and abuts against the upper pin 81 which is biased radially inward by the biasing member 83, preventing the insertion of the upper pin 81 into the lower pin hole 91. A clearance CL is formed between the regulating member 84 and the lower pin 82 in the first inner cylinder side housing groove 92. In this state, the inner cylinder 2 is rotatable along the shear line formed between the regulating member 84 and the upper pin 81, with the regulating member 84 housed in the first inner cylinder side housing groove 92 of the inner cylinder 2, so the cylinder lock 1 can be locked and unlocked as usual.

[0070] Next, when an unlocking key 100B (e.g., the second key) is inserted in order to perform a key change, and the key change engagement groove 103 corresponding to the lower pin 82 of the pin structure 8 is not formed, the lower pin 82 is pushed radially outward by the outer surface of the unlocking key 100B and becomes completely embedded in the lower pin hole 91, as shown in Figure 17. The amount of movement of the lower pin 82 at this time corresponds to (clearance CL) + (outer diameter of the regulating member 84). As a result, the regulating member 84, which is housed in the first inner cylinder side housing groove 92 of the inner cylinder 2, is housed in the outer cylinder side housing groove 95 of the outer cylinder 3, while pushing the upper pin 81 in the upper pin hole 94 radially outward against the biasing force of the biasing member 83. The amount of movement of the upper pin 81 at this time is only a very small amount, corresponding to the outer diameter of the regulating member 84.

[0071] In this state, as shown in Figure 18, when the unlocking key 100B is rotated in the operating direction for key change (clockwise in Figure 18), the regulating member 84 is housed in the outer cylinder side housing groove 95 of the outer cylinder 3, and the inner cylinder 2 rotates along the shear line formed between the regulating member 84 and the lower pin 82. Subsequently, as shown in Figure 19, when the second inner cylinder side housing groove 93 of the inner cylinder 2 and the outer cylinder side housing groove 95 of the outer cylinder 3 align radially, the regulating member 84 in the outer cylinder side housing groove 95 is pushed down by the biasing force of the biasing member 83 onto the upper pin 81 and housed in the second inner cylinder side housing groove 93.

[0072] When the inner cylinder 2 returns to its original position, the lower pin hole 91 of the inner cylinder 2 and the upper pin hole 94 of the outer cylinder 3 align radially again, as shown in Figure 20. Since the regulating member 84 is housed in the second inner cylinder side housing groove 93, when the unlocking key 100A is removed from the keyhole 21, the upper pin 81 moves radially inward toward the lower pin hole 91 due to the biasing force of the biasing member 83. The upper pin 81 is inserted deep into the lower pin hole 91 beyond the shear line and comes into contact with the lower pin 82, positioned to fill the clearance CL.

[0073] Figure 21 shows the state after a key change operation has been performed with the unlocking key 100B, and the unlocking key 100A has been inserted into the keyhole 21 again. The unlocking key 100A has a key change engagement groove 103 that engages with the lower pin 82 of the key change mechanism 9 that has already undergone a key change operation. Therefore, when the lower pin 82 engages with the key change engagement groove 103 of the unlocking key 100A after the key change operation, the upper pin 81, which is biased by the biasing member 83, is inserted into the lower pinhole 91 beyond the shear line. As a result, even if one tries to rotate the inner cylinder 2 by operating the unlocking key 100A, it is blocked by the upper pin 81 which is positioned across the shear line, and the cylinder lock 1 cannot be unlocked. The upper pin 81 is inserted deep into the lower pinhole 91 so as to fill the clearance CL beyond the shear line, effectively preventing the rotation of the inner cylinder 2. This allows the cylinder lock 1 to exert a large locking force.

[0074] Figure 22 shows the state after a key change operation has been performed with the unlocking key 100B, and the same unlocking key 100B has been inserted into the keyhole 21 again. Since the unlocking key 100B does not have a key change engagement groove 103 that engages with the lower pin 82 of the key change mechanism 9 that has already been operated for key change, the lower pin 82 after the key change operation is pushed radially outward by the outer surface of the unlocking key 100B and is completely embedded in the lower pin hole 91. Since the regulating member 84 is housed in the second inner cylinder side housing groove 93, the shear line is positioned between the upper pin 81 and the lower pin 82. As a result, when the unlocking key 100B is operated, the inner cylinder 2 can be rotated, and the cylinder lock 1 can be locked and unlocked.

[0075] With this cylinder lock 1, the key change engagement grooves 103 for each unlocking key 100 from the 2nd to the 8th key are shortened by one pitch each, so that they alternate between each key change mechanism 9 in the key change mechanism array 90A and each key change mechanism 9 in the key change mechanism array 90B, thereby enabling seven key change operations. The key change mechanism 9 consists only of a pin structure 8 comprising an upper pin 81, a lower pin 82, a biasing member 83, and a regulating member 84, a first inner cylinder side housing groove 92 and a second inner cylinder side housing groove 93 formed in the inner cylinder 2, and an outer cylinder side housing groove 95 formed in the outer cylinder 3, thus suppressing the radial size of the cylinder lock 1. Because the cylinder lock 1 is formed to be small in diameter and compact, it can be installed not only on large building equipment but also on small building equipment that was previously impossible to install.

[0076] In this embodiment, the cylinder lock 1 is positioned when inserting the unlocking key 100 into the keyhole by engaging multiple drive engagement grooves 101 formed at the tip of the unlocking key 100 with the drive ends 243 of multiple drive pins 24 located at the rear end X2 of the inner cylinder 2. This allows the inner cylinder 2 to rotate in synchronization with the rotation of the unlocking key 100. The drive engagement grooves 101 (sometimes referred to as "recesses") formed at the tip of the unlocking key 100 and the drive ends 243 (sometimes referred to as "protrusions") of the drive pins 24 provided at the end of the keyhole 21 engage to perform the above positioning. In this way, because the positioning is performed at the end of the keyhole 21, the same unlocking key 100 can be used to lock and unlock multiple cylinder locks 1 with different keyhole lengths, i.e., axial lengths. Therefore, even if the axial lengths of the cylinder locks differ, the same unlocking key 100 can be used in common as long as the drive end 243 of the drive pin 24 is commonly located at the rear end X2 of the inner cylinder 2. Furthermore, the multiple key change mechanisms 9 are provided at the same axial position relative to the tip of the unlocking key 100 in the cylinder lock 1 (the rear end of the cylinder lock 1), regardless of the axial length of the cylinder lock 1.

[0077] In the embodiments described above, the regulating member 84 is housed in the first inner cylinder side housing groove 92 so as to be arranged parallel to the axial direction of the cylinder lock 1, but is not limited thereto. The regulating member 84 may be housed in the first inner cylinder side housing groove 92 so as to be arranged in a direction intersecting the axial direction of the cylinder lock 1. Figure 23 shows an example in which the longitudinal directions of the first inner cylinder side housing groove 92 and the second inner cylinder side housing groove 93 are arranged in a direction that intersects obliquely with the axial direction of the cylinder lock 1. In this case, the regulating member 84 is housed in the first inner cylinder side housing groove 92 and the second inner cylinder side housing groove 93 in a direction that intersects obliquely with the axial direction of the cylinder lock 1. According to this, the spacing between each lower pin hole 91 of the inner cylinder 2 and the spacing between each upper pin hole 94 of the outer cylinder 3 along the axial direction of the cylinder lock 1 can be shortened, thereby further shortening the axial length of the cylinder lock 1.

[0078] Figure 24 shows an entrance door 200, which is a building fixture equipped with a cylinder lock 1 according to this embodiment. The entrance door 200 is one aspect of building equipment. The entrance door 200 is an opening and closing member that is housed in a door opening 300 of the building structure so as to be openable and closable. The entrance door 200 has a handle 201 for opening and closing operation on the door edge side, and a pair of cylinder locks 1 positioned above and below the handle 201, respectively.

[0079] Figure 25 shows a delivery box 400 equipped with a cylinder lock 1 according to this embodiment. The delivery box 400 is one form of building equipment. The delivery box 400 has a door body 402, which is an openable and closable opening and closing member, on the front of a housing 401 in which a package storage compartment is formed inside. A handle 403 is provided on the leading edge side of the door body 402. The cylinder lock 1 is attached to the handle 403.

[0080] Figure 26 shows a gate 500 equipped with a cylinder lock 1 according to this embodiment. The gate 500 is one form of building equipment. The gate 500 has a pair of door bodies 502, 502 that are attached to the left and right wall sections 501, 501 so as to be openable and closable. The pair of door bodies 502, 502 are opening and closing members. Each of the door bodies 502, 502 has a handle 503, 503 on the leading edge side. A cylinder lock 1 is attached to the leading edge side of one of the door bodies 502.

[0081] These are merely examples of building equipment to which the cylinder lock 1 according to this embodiment can be applied. In addition to these entrance doors 200, delivery boxes 400, and gates 500, the cylinder lock 1 according to this embodiment can be widely applied to any fixtures and other building equipment that have opening and closing members such as doors and gates and require security. Building equipment includes all equipment located inside and outside a building to which the cylinder lock 1 can be applied. The cylinder lock 1 can be applied to, for example, back doors, patio doors, window frames, interior doors, garage shutters, window shutters, mailboxes, padlocks, crescent locks, safes, display cases, refrigerators, freezers, storage rooms (e.g., wine cellars), closets, furniture drawers, jewelry boxes, and doors to machine rooms where various mechanical equipment is installed. Thus, the cylinder lock 1 according to this embodiment can be applied to a group of building equipment consisting of multiple fixtures and other building equipment installed in a building such as a house, regardless of size. That is, each building equipment constituting the group of building equipment can be equipped with a common cylinder lock 1 that locks and unlocks the opening and closing members with the same unlocking key.

[0082] Therefore, as shown in Figure 27, by applying the cylinder lock 1 to multiple types of building equipment, multiple types of building equipment can be locked and unlocked using a common (identical) unlocking key 100A (1st key). As shown in Figure 28, by changing the key to the second unlocking key 100B (2nd key), the first unlocking key 100A (1st key) can be rendered unusable for all multiple types of building equipment, and they can be locked and unlocked in common using the same unlocking key 100B after the key change.

[0083] The cylinder lock 1 of this embodiment provides the following effects.

[0084] The cylinder lock 1 of this embodiment comprises an inner cylinder 2 having a keyhole 21 into which an unlocking key 100 is inserted, an outer cylinder 3 that rotatably fits the inner cylinder 2, and a key change mechanism 9 provided across the inner cylinder 2 and the outer cylinder 3, wherein the key change mechanism 9 comprises an upper pin hole 94 provided in the outer cylinder 3, an upper pin 81 housed in the upper pin hole 94 so as to be radially movable, a biasing member 83 that biases the upper pin 81 radially inward, a lower pin hole 91 provided in the inner cylinder 2, and a radially movable member housed in the lower pin hole 91 The lock comprises a lower pin 82 positioned so that its tip protrudes into the keyhole 21, a restricting member 84 that restricts the movement of the upper pin 81 toward the lower pin 82, a first inner cylinder side housing groove 92 provided on the outer circumferential surface 20 of the inner cylinder 2 so as to straddle the lower pin hole 91 and house the restricting member 84, a second inner cylinder side housing groove 93 provided on the outer circumferential surface 20 of the inner cylinder 2 for housing the restricting member 84 during key change operation, and an outer cylinder side housing groove 95 provided on the inner circumferential surface 30b of the outer cylinder 3 so as to straddle the upper pin hole 94 and house the restricting member 84. With this configuration, the amount of movement of the upper pin 81 during key change operation is only the amount of movement corresponding to the outer diameter of the restricting member 84, so the depth of the upper pin hole 94 can be formed to the minimum necessary depth. As a result, the diameter of the outer cylinder 3 is suppressed, and the cylinder lock 1 can be made smaller.

[0085] In this embodiment, the key change mechanism 9 is provided in multiple locations along the axial direction of the cylinder lock 1, and is provided at the same axial position and has the same structure in multiple cylinder locks with different axial lengths. This allows the same unlocking key 100 to be used in common for cylinder locks with different axial lengths to perform key changes.

[0086] In this embodiment, the axial length of the restricting member 84 is longer than the diameters of the upper pin hole 94 and the lower pin hole 91. This allows the restricting member 84 to be positioned so as to reliably straddle the lower pin hole 91.

[0087] In this embodiment, the restricting member 84 is positioned across the lower pin hole 91 by being housed in the first inner cylinder side housing groove 92. This ensures that the movement of the upper pin 94 across the lower pin hole 91 is reliably restricted while stably maintaining the state in which the restricting member 84 straddles the lower pin hole 91.

[0088] In this embodiment, the restricting members 84 are arranged to straddle each lower pin hole 91. This allows the movement of the upper pin 94 through each lower pin hole 91 to be restricted.

[0089] In this embodiment, the restricting member 84 is housed in the first inner cylinder side housing groove 92 along the axial direction of the inner cylinder 2. This allows the restricting member 84 to be formed in a straight line along the axial direction of the inner cylinder 2.

[0090] In this embodiment, the regulating member 84 is housed in the first inner cylinder side housing groove 92 along a direction intersecting the axial direction of the inner cylinder 2. This allows the spacing of the lower pin holes 91 along the axial direction of the inner cylinder 2 to be shortened, thereby enabling further miniaturization of the cylinder lock 1.

[0091] In this embodiment, the center position of the first inner cylinder housing groove 92 along the axial direction of the inner cylinder 2 and the center position of the outer cylinder side housing groove 95 along the axial direction of the outer cylinder 3 are located at the same axial position of the cylinder lock 1. This ensures that the regulating member 84 can be reliably moved from the first inner cylinder housing groove 92 to the outer cylinder side housing groove 95 during key change operation.

[0092] In this embodiment, the outer circumferential surface of the upper pin 81 on the inner cylinder 2 side and the inner circumferential surface of the lower pin hole 91 of the inner cylinder 2 are similar in shape, and the outer circumferential surface of the upper pin 81 on the inner cylinder 2 side and the inner circumferential surface of the lower pin hole 91 are parallel to the biasing direction of the biasing member 83 directed radially inward of the upper pin. This ensures that the upper pin 81 and the lower pin hole 91 are reliably engaged during the key change operation, and the locking force after the key change operation is strengthened.

[0093] In this embodiment, when the regulating member 84 is housed in the first inner cylinder side housing groove 92, a clearance CL is provided between the regulating member 84 and the lower pin 82, allowing the lower pin 82 to move freely radially within the lower pin hole 91. This allows the upper pin 81 to be inserted deep into the lower pin hole 91 when the cylinder lock 1 is locked after a key change operation.

[0094] In this embodiment, when the regulating member 84 is housed in the second inner cylinder side housing groove 93 and the upper pin hole 94 and the lower pin hole 91 are aligned by the rotation of the inner cylinder 2 in the return direction, the upper pin 81 inserted into the lower pin hole 91 by the biasing force of the biasing member 83 is positioned at clearance CL. As a result, the upper pin 81 is inserted deep into the lower pin hole 91, effectively preventing the rotation of the inner cylinder 2. Therefore, the cylinder lock 1 can exert a large locking force.

[0095] In this embodiment, key change mechanism arrays 90A and 90B are formed by a plurality of key change mechanisms 9 provided along the axial direction. This allows the cylinder lock 1 to perform multiple key change operations.

[0096] In this embodiment, the key change mechanism rows 90A and 90B are arranged diagonally opposite each other, with the keyhole 21 in between. This arrangement prevents an increase in the axial length of the cylinder lock 1, even when multiple key change mechanisms 9 are provided.

[0097] In this embodiment, the key change mechanisms 9 of the key change mechanism rows 90A and 90B, which are positioned diagonally opposite each other, are offset by half a pitch in the axial direction. This further suppresses the increase in the axial length of the cylinder lock 1.

[0098] In this embodiment, the building equipment (for example, an entrance door 200, a delivery box 400, a gate 500) is equipped with the cylinder lock 1 described above. This makes it possible to provide building equipment equipped with a cylinder lock 1 having a key change mechanism that can be miniaturized as described above.

[0099] In this embodiment, the unlocking key 100, which is inserted into the keyhole 21 of the cylinder lock 1 to lock and unlock the cylinder lock 1, has at least one key change engagement groove 103 that engages with the lower pin 82 of the key change mechanism 9. This allows the unlocking key 100 to perform the key change operation of the miniaturized cylinder lock 1.

[0100] This disclosure includes cylinder locks, building fixtures, and keys as described in the following embodiments.

[0101] <Aspect 1> An inner cylinder having a keyhole into which a key is inserted, An outer cylinder into which the inner cylinder is rotatably fitted, A cylinder lock comprising a key change mechanism provided across the inner cylinder and the outer cylinder, The aforementioned key change mechanism is The upper pin hole provided in the outer cylinder, An upper pin is housed in the upper pin hole so as to be movable in the radial direction, A biasing member that biases the upper pin radially inward, The lower pin hole provided in the inner cylinder, A lower pin is housed in the lower pin hole so as to be radially movable, and its tip is positioned so as to protrude into the keyhole, A restricting member that restricts the movement of the upper pin toward the lower pin, On the outer circumferential surface of the inner cylinder, there is a first inner cylinder side housing groove that straddles the lower pin hole and houses the regulating member, A second inner cylinder side housing groove is provided on the outer circumferential surface of the inner cylinder and accommodates the specified member during key change operation, A cylinder lock comprising: an outer cylinder side housing groove provided on the inner circumferential surface of the outer cylinder so as to straddle the upper pin hole and to accommodate the regulating member.

[0102] <Aspect 2> The aforementioned key change mechanism is provided in multiple locations along the axial direction of the cylinder lock. The cylinder lock according to embodiment 1, wherein multiple cylinder locks with different axial lengths are provided at the same axial position and have the same structure.

[0103] <Aspect 3> The cylinder lock according to embodiment 1 or 2, wherein the axial length of the specified member is longer than the diameters of the upper pin hole and the lower pin hole.

[0104] <Aspect 4> The cylinder lock according to any one of embodiments 1 to 3, wherein the regulating member is housed in the first inner cylinder side housing groove and is positioned to straddle the lower pin hole.

[0105] <Aspect 5> The cylinder lock according to embodiment 4, wherein the regulating member is arranged to straddle each of the lower pin holes.

[0106] <Aspect 6> The cylinder lock according to any one of embodiments 1 to 5, wherein the regulating member is housed in the first inner cylinder side housing groove along the axial direction of the inner cylinder.

[0107] <Aspect 7> The cylinder lock according to any one of embodiments 1 to 5, wherein the regulating member is housed in the first inner cylinder side housing groove along a direction intersecting the axial direction of the inner cylinder.

[0108] <Aspect 8> A cylinder lock according to any one of embodiments 1 to 7, wherein the center position of the first inner cylinder housing groove along the axial direction of the inner cylinder and the center position of the outer cylinder side housing groove along the axial direction of the outer cylinder are located at the same position in the axial direction of the cylinder lock.

[0109] <Pattern 9> The outer circumferential surface of the upper pin on the inner cylinder side and the inner circumferential surface of the lower pin hole of the inner cylinder are similar in shape. A cylinder lock according to any one of embodiments 1 to 8, wherein the outer circumferential surface of the upper pin on the inner cylinder side and the inner circumferential surface of the lower pin hole are parallel planes with respect to the biasing direction of the biasing member directed radially inward of the upper pin.

[0110] <Aspect 10> A cylinder lock according to any one of embodiments 1 to 9, wherein, when the regulating member is housed in the first inner cylinder side housing groove, a clearance is provided between the regulating member and the lower pin, allowing the lower pin to move freely radially within the lower pin hole.

[0111] <Aspect 11> The cylinder lock according to embodiment 10, wherein the regulating member is housed in the second inner cylinder side housing groove, and when the inner cylinder rotates in the return direction, the upper pin hole is aligned with the lower pin hole, and the upper pin, inserted into the lower pin hole by the biasing force of the biasing member, is positioned in the clearance.

[0112] <Aspect 12> A cylinder lock according to any one of embodiments 1 to 11, wherein a row of key change mechanisms is formed by a plurality of key change mechanisms provided along the axial direction.

[0113] <Aspect 13> The cylinder lock according to embodiment 12, wherein the row of key change mechanisms is arranged diagonally across the keyhole.

[0114] <Aspect 14> The cylinder lock according to embodiment 13, wherein the key change mechanisms of the rows of key change mechanisms arranged at diagonal positions are offset by half a pitch in the axial direction.

[0115] <Aspect 15> A building fixture equipped with a cylinder lock as described in any of embodiments 1 to 14.

[0116] <Aspect 16> A key that locks and unlocks a cylinder lock by being inserted into the keyhole of a cylinder lock according to any of embodiments 1 to 14, A key having at least one key change engagement groove that engages with the lower pin of the key change mechanism. [Explanation of Symbols]

[0117] 1 Cylinder lock, 2 Inner cylinder, 20 Outer surface of inner cylinder, 21 Keyhole, 3 Outer cylinder, 30b Inner surface of outer cylinder, 8 Pin structure, 81 Upper pin, 82 Lower pin, 83 Biasing member, 84 Rod-shaped body, 9 Key change mechanism, 91 Lower pin hole, 92 Rod-shaped body housing groove on the first inner cylinder side, 93 Rod-shaped body housing groove on the second inner cylinder side, 94 Upper pin hole, 95 Rod-shaped body housing groove on the outer cylinder side, 100, 100A, 100B Unlocking key, 200 Entrance door (building equipment), 400 Delivery box (building equipment), 500 Gate (building equipment), CL Clearance

Claims

1. An inner cylinder having a keyhole into which a key is inserted, An outer cylinder into which the inner cylinder is rotatably fitted, A cylinder lock comprising a key change mechanism provided across the inner cylinder and the outer cylinder, The aforementioned key change mechanism is The upper pin hole provided in the outer cylinder, An upper pin is housed in the upper pin hole so as to be movable in the radial direction, A biasing member that biases the upper pin radially inward, The lower pin hole provided in the inner cylinder, A lower pin is housed in the lower pin hole so as to be radially movable, and its tip is positioned so as to protrude into the keyhole, A restricting member that restricts the movement of the upper pin toward the lower pin, On the outer circumferential surface of the inner cylinder, there is a first inner cylinder side housing groove that straddles the lower pin hole and houses the regulating member, A second inner cylinder side housing groove is provided on the outer circumferential surface of the inner cylinder and accommodates the specified member during key change operation, A cylinder lock comprising: an outer cylinder side housing groove provided on the inner circumferential surface of the outer cylinder so as to straddle the upper pin hole and to accommodate the regulating member.

2. The aforementioned key change mechanism is provided in multiple locations along the axial direction of the cylinder lock. The cylinder lock according to claim 1, wherein multiple cylinder locks with different axial lengths are provided at the same axial position and have the same structure.

3. The cylinder lock according to claim 1, wherein the axial length of the specified member is longer than the diameters of the upper pin hole and the lower pin hole.

4. The cylinder lock according to claim 2, wherein the regulating member is housed in the first inner cylinder side housing groove and is positioned to straddle the lower pin hole.

5. The cylinder lock according to claim 4, wherein the regulating member is arranged to straddle each of the lower pin holes.

6. The cylinder lock according to any one of claims 1 to 5, wherein the regulating member is housed in the first inner cylinder side housing groove along the axial direction of the inner cylinder.

7. The cylinder lock according to any one of claims 1 to 5, wherein the regulating member is housed in the first inner cylinder side housing groove along a direction intersecting the axial direction of the inner cylinder.

8. The cylinder lock according to any one of claims 1 to 5, wherein the center position of the first inner cylinder housing groove along the axial direction of the inner cylinder and the center position of the outer cylinder side housing groove along the axial direction of the outer cylinder are located at the same position in the axial direction of the cylinder lock.

9. The outer circumferential surface of the upper pin on the inner cylinder side and the inner circumferential surface of the lower pin hole of the inner cylinder are similar in shape. The cylinder lock according to any one of claims 1 to 5, wherein the outer circumferential surface of the upper pin on the inner cylinder side and the inner circumferential surface of the lower pin hole are parallel planes with respect to the biasing direction by the biasing member directed radially inward of the upper pin.

10. A cylinder lock according to any one of claims 1 to 5, wherein, when the regulating member is housed in the first inner cylinder side housing groove, a clearance is provided between the regulating member and the lower pin, allowing the lower pin to move freely radially within the lower pin hole.

11. The cylinder lock according to claim 10, wherein the regulating member is housed in the second inner cylinder side housing groove, and when the inner cylinder rotates in the return direction, the upper pin hole is aligned with the lower pin hole, and the upper pin, inserted into the lower pin hole by the biasing force of the biasing member, is positioned in the clearance.

12. A cylinder lock according to any one of claims 1 to 5, wherein a row of key change mechanisms is formed by a plurality of key change mechanisms provided along the axial direction.

13. The cylinder lock according to claim 12, wherein the row of key change mechanisms is arranged diagonally across the keyhole.

14. The cylinder lock according to claim 13, wherein the key change mechanisms of the rows of key change mechanisms arranged at diagonal positions are arranged with a half-pitch offset in the axial direction.

15. A building fixture comprising a cylinder lock according to any one of claims 1 to 5.

16. A key that locks and unlocks a cylinder lock by being inserted into the keyhole of the cylinder lock according to any one of claims 1 to 4, A key having at least one key change engagement groove that engages with the lower pin of the key change mechanism.

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