JP2011202485A - Keyhole cover for door keylock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a keyhole cover for a door keylock which, for an authorized locking/unlocking person, can open a keyhole in a door keylock by a mere simple operation without the need to use a key, a special tool or the like while, for an outsider, cannot simply open the keyhole.SOLUTION: A keyhole cover for a door keylock comprises a base member 11 that is fixed to a door keylock in such a state that a key operating hole 114 is in communication with a keyhole, an annular cover member 12 that covers the base member 11 and is rotatably provided with the center of the base member 11 being an axis, a cap member 13 that covers a key operating hole 114 in such a state that is connected to the base member 11 and has been fitted into a cap fitting hole 121, a cam ring mechanism CRM that performs switching between a buried and fitted state and a fitting released state in conjunction with the rotation of a cover member 12, and a rotation regulation mechanism CCM that regulates the rotation operation of the cover member 12 in such a state that the axial position of the cover member 12 is in a first position while the regulation of the rotation operation of the cover member 12 is released in such a state that the axial position is in a second position.

Description

  The present invention relates to a keyhole cover for a door lock that is attached to hide a keyhole of a door lock.

  Conventionally, various door lock keyhole covers that are attached to the door lock to conceal the keyhole of the door lock have been proposed. This type of door lock keyhole cover is used to enhance security and prevent illegal mischief. In this connection, for example, a door double lock is known in which a keyhole (hole) of a door lock is covered with an openable / closable lid, and the lid can be locked with a second lock (for example, a patent) See reference 1.) However, in general, a plurality of keys must be carried, and when a part of them is forgotten to be carried, it cannot be unlocked.

  As an example of a general door lock key hole cover, a door lock key hole, a base member that is attached to the key operation hole in communication, and a circular shape that pivotally connects to the base member to open and close the key operation hole. A door lock keyhole cover constituted by a lid-like cap member is generally used. In this door lock key hole cover, for example, when not locked or unlocked, the key hole is hidden by dusting or waterproofing the key hole or by overlapping the cap member on the base member so that the key hole is not tampered with illegally.

  However, in the keyhole cover for the door lock as described above, the keyhole is hidden by the cap member so that the presence of the keyhole is not noticed at first glance, but the cap member is rotated with respect to the base member. You can easily expose the keyhole. Therefore, the actual situation is that it is not possible to prevent mischief against a person who intentionally mischiefs by stuffing foreign objects into the keyhole.

  Patent Document 2 includes a cap base that is fixed on a key lock by communicating a key operation hole with the key hole, and a cap cover that is pivotally connected to the cap base to open and close the key operation hole. When the cover is rotated in the opening direction, the lock cap that opens the key operation hole and exposes the key hole to the outside, the cap base has a guide hole with a pin insertion opening upward on the cap cover side, The guide hole and one end communicate with each other, while the other end is opened toward the peripheral edge to provide a thin shaft insertion hole that forms an insertion port for the external operation member, and the guide hole has a locking projection on the base side. The body's stopper pin is loosely fitted so that its head can protrude and retract from the pin insertion port, while the cap cover is pinned downward to a position that communicates with the pin insertion port when it is closed and stacked on the cap base. The receiver The digit pin engagement concave portion is provided, the pin engaging in the recess, formed by fitting the magnet for attracting the head of the stopper pin, the key lock cap is disclosed.

JP 2002-97821 A JP 2005-273189 A

  According to the key lock cap disclosed in Patent Document 2, a legitimate locker / unlocker can open the cap member (cap cover) with a simple operation. Even if a key lock is noticed, the cap member (cap cover) cannot be easily opened.

  However, when this lock cap is used, it is necessary for a proper locker / unlocker to carry the external operation member. Therefore, if the external operation member is forgotten to be carried, it cannot be unlocked. Can occur. In addition, even if this external operation member can be replaced by a dedicated release key for a lock having a thin shaft at the tip, the insertion port of the external operation member is exposed to the outside, If you try to mischief, you can easily pack foreign objects into this slot. Therefore, it is considered that there is still room for improvement in this type of door lock keyhole cover.

  The present invention has been made in view of the above-described problems, and its purpose is to open the keyhole of the door lock only by a simple operation without using a key or a special tool for a legitimate locker / unlocker. It is possible to provide a keyhole cover for a door lock that cannot be easily opened for those who are not legal lockers and unlockers (hereinafter also referred to as “outsiders”). .

  The present invention solves the above problems by providing the following configuration. That is, the present invention is a door lock keyhole cover attached to the door lock to conceal the keyhole of the door lock, and has a circular outer peripheral side, and the door is in a state where the key operation hole is communicated with the keyhole. A base member fixed to a lock, and a cap fitting that covers the base member and is provided so as to be rotatable about the center of the base member as an opening hole so that the key operation hole of the base member faces the outside An annular cover member in which a joint hole is formed, a cap member connected to the base member and covering the key operation hole of the base member in a state of being fitted into the cap fitting hole of the cover member; In conjunction with the rotation of the cover member, an embedded fitting state in which the cap member is buried in the cap fitting hole and a fitting release state in which the cap member is released A switching mechanism for switching, and While the relative position of the cover member with respect to the base member in the central axis direction of the base member is at the first position, the rotation operation of the cover member is restricted, while the relative position of the cover member is at the first position. A door lock keyhole cover comprising: a rotation restricting mechanism for releasing restriction of the rotation operation in a state of being in a second position separated from the base member.

  In the present invention, during the non-locking / unlocking operation, the rotational position of the cover member is maintained at a position corresponding to the buried fitting state, and the relative position of the cover member to the base member is maintained at the first position. According to this, since the cap member is maintained in the buried fitting state, an outsider cannot directly grip the cap member and cannot pull out the cap member from the cap fitting hole. In addition, since it is difficult for an outsider to notice the presence of the rotation restricting mechanism unless it is a legitimate locker / unlocker, it is not easy for an outsider to displace the relative position of the cover member relative to the base member from the first position to the second position. Therefore, at the time of non-locking / unlocking operation, an outsider does not operate the switching mechanism to switch from the buried fitting state to the fitting release state. Therefore, according to the present invention, at the time of the unlocking / unlocking operation, the key operation hole is not opened by an outsider, and unauthorized unlocking and mischief can be suppressed.

  On the other hand, when a legitimate lock / unlocker who knows the operation method of the keyhole cover for door lock according to the present invention performs a lock / unlock operation (lock / unlock operation) of the door lock, The member is displaced from the first position to the second position, and is rotated to the rotational position corresponding to the fitted release state. Thus, the rotation operation of the cover member is permitted when the relative position of the cover member becomes the second position. Accordingly, a legitimate locker / unlocker can easily switch from the buried fitting state to the fitting release state by operating the switching mechanism by rotating the cover member. Thereby, the key operation hole covered with the cap member can be exposed to the outside, and the key hole can be easily opened.

Further, in the keyhole cover for door lock according to the present invention, a cap support portion for supporting a peripheral portion of the cap member is formed inside the cap fitting hole in the cover member, and the switching mechanism includes the cap A cover-side cam formed in an annular shape on the support portion; and a cap-side cam formed in an annular shape on a peripheral portion of the cap member; and the cover-side cam and the cap in conjunction with a rotation operation of the cover member You may change the lift amount of the said cap member with respect to the said cover member by changing the mutual contact position in a side cam.

  According to this configuration, the relative rotational movement between the cover member and the cap member is converted into the vertical movement of the cap member by the cover side cam and the cap side cam, thereby changing the lift amount of the cap member. Can do. In this configuration, in the cover side cam and the cap side cam, the cap member is in the embedded fitting state when the lift amount of the cap member is minimum, and the fitting is released when the lift amount is maximum. The cam profile, the shape parameters of the cover member and the cap member may be set.

  Each of the cover-side cam and the cap-side cam has a cam protrusion that protrudes relatively and a cam recess that is recessed as compared with the cam protrusion, and the cover-side cam and the cap When the cam convex portion and the cam concave portion of the side cam are engaged, the cap member is in the embedded fitting state, and the cam convex portions of the cover side cam and the cap side cam overlap each other. You may comprise so that a cap member may be in the said fitting cancellation | release state.

  Here, when the cam convex portion and the cam concave portion of the cover side cam and the cap side cam engage with each other, the lift amount of the cap member is minimized. Further, when the cam convex portions of the cover side cam and the cap side cam overlap each other, the lift amount of the cap member is maximized. Therefore, in this configuration, the cap member can be suitably switched between the buried fitting state and the fitting released state in conjunction with the relative rotation operation of the cover member with respect to the base member.

  In addition, for example, in each of the cover side cam and the cap side cam, a plurality of cam convex portions and cam concave portions are alternately arranged, and adjacent cam convex portions and cam concave portions are connected by an inclined surface. Also good.

  Further, in the door lock keyhole cover of the present invention, the rotation restricting mechanism includes a locking protrusion provided on one of the cover member and the base member, and a locking protrusion provided on the other and the locking member. A fitting groove into which the projecting portion is fitted, and when the cover member is in the first position, the locking projection and the fitting groove are fitted, and the cover member In the second position, the engagement of the locking projection and the fitting groove may be released. According to this, the rotation operation of the cover member can be switched between restriction and release by a simple mechanism.

  Further, in the keyhole cover for the door lock of the present invention, further comprising a biasing means for biasing the cover member in a direction in which the cover member is displaced from the second position to the first position, and with the rotation operation of the cover member, When the locking protrusion and the fitting groove overlap in the central axis direction of the base member, the locking protrusion and the fitting groove are automatically fitted by the urging force of the urging means. May be configured.

  Further, in the door lock keyhole cover according to the present invention, when the rotation position of the cover member coincides with the switching position between the buried fitting state and the fitting release state, the locking protrusion is provided. The locking protrusion and the fitting groove may be arranged so that the fitting groove overlaps in the central axis direction of the base member. According to this configuration, it is possible to synchronize the timing at which the state of the cap member is switched between the buried fitting state and the fitting released state with the timing at which the rotation of the cover member is restricted and the release thereof is switched.

  According to the present invention, it is possible for a legitimate locker / unlocker to open the keyhole of the door lock with a simple operation without using a key or a special tool, while it is easy for an outsider. Can provide a keyhole cover for door locks that cannot be opened.

It is a perspective view which shows the state which attached the keyhole cover 1 for door locks which concerns on embodiment to the door lock 100. FIG. It is explanatory drawing for demonstrating the main structures of the keyhole cover for locks concerning embodiment. It is the perspective view which showed the surface side of the keyhole cover for door locks which concerns on embodiment. It is a surface view of the keyhole cover for door locks in a state where the cap member according to the embodiment is fitted to the cover member. It is the sectional view on the AA line shown in FIG. FIG. 6 is a sectional view taken along line B-B shown in FIG. 5. It is the disassembled perspective view which showed the surface side of the keyhole cover for door locks which concerns on embodiment. It is the disassembled perspective view which showed the back surface side of the keyhole cover for door locks which concerns on embodiment. It is the perspective view which showed the surface side of the cover member which concerns on embodiment. It is the perspective view which showed the back surface side of the cover member which concerns on embodiment. It is explanatory drawing for demonstrating the cross-section of the cover member which concerns on embodiment. (A) is the figure which showed the surface of the cover member. (B) is the XX sectional view shown to (a). (C) is the YY sectional view taken on the line shown to (a). It is the perspective view which showed the back surface side of the cap member which concerns on embodiment. It is explanatory drawing for demonstrating the cross-section of the cap member which concerns on embodiment. (A) is the figure which showed the back surface of the cap member. (B) is the XX sectional view shown to (a). (C) is the YY sectional view taken on the line shown to (a). It is the perspective view which showed the surface side of the base member which concerns on embodiment. It is a 1st state figure showing the use state of the keyhole cover for door locks concerning an embodiment. It is a 2nd state figure which shows the use condition of the keyhole cover for door locks which concerns on embodiment. It is a 3rd state figure which shows the use condition of the keyhole cover for door locks which concerns on embodiment. It is a 4th state figure which shows the use condition of the keyhole cover for door locks which concerns on embodiment. It is a 5th state figure which shows the use condition of the keyhole cover for door locks which concerns on embodiment.

<First embodiment>
FIG. 1 is a perspective view showing a state in which the door lock keyhole cover 1 according to the embodiment is attached to the door lock 100. FIG. 2 is an explanatory diagram for explaining the main structure of the door lock keyhole cover 1. In this embodiment, the door lock keyhole cover 1 is attached to the door lock 100 in order to hide the keyhole of the door lock 100 incorporated in the door 200.

  The door lock 100 is a cylinder lock, for example, and a cylinder (not shown) is incorporated in the lock case body 101. Further, a latch 102 is incorporated in the lock case body 101 so as to be able to appear and retract. As for the door lock 100, the lock case main body 101 is being fixed to the door 200 with fixing tools, such as a volt | bolt. The door 200 is formed with a through hole for allowing the key hole 103 to be exposed to the outside. When the lock case body 101 is fixed to the door 200, the key hole 103 communicates with the through hole. Are matched.

The keyhole cover 1 for the door lock has a base member 11 fixed to the door lock 100 incorporated in the door 200, a cover member 12 covered so as to cover the base member 11, and a cap member 13 as main structural members. Prepare. The base member 11 is formed with a key operation hole 114 (which will be described in detail later) that communicates with the key hole 103, and when a legitimate locker / unlocker locks or unlocks (unlocks) the door lock 100. Inserts the key K into the key hole 103 through the key operation hole 114.
That is, the key operation hole 114 formed in the base member 11 is a guide hole that guides the key K to the key hole when an authorized lock / unlock operator inserts the key K into the key hole 103 and performs the unlocking operation of the door lock 100. Function as.

  Normally, when the unlocking / unlocking operation is performed, the state shown in FIG. 1 is established, and the key operation hole 114 formed in the base member 11 is hidden. Specifically, the cap member 13 is fitted so as to be buried in the annular cover member 12. Thereby, a person (outsider) other than a proper locker / unlocker, for example, an unauthorized intruder or the like cannot open the cap member 13. On the other hand, when a legitimate locker / unlocker locks / unlocks the door lock 100, the cap member 13 can be opened as shown in FIG. 11 with the key operation hole 114 facing the outside. FIG. 3 is a perspective view showing the surface side of the door lock keyhole cover 1.

  Next, the detailed structure of the keyhole cover 1 for door locks is demonstrated. FIG. 4 is a front view of the door lock keyhole cover 1 in a state where the cap member 13 is fitted to the cover member 12. In this specification, the surface that is visible when the door lock keyhole cover 1 attached to the door lock 100 is viewed from the front of the door 200 is defined as “front surface”, and the opposite surface is defined as “back surface”. To do. 5 and 6 are cross-sectional views taken along line AA and line BB shown in FIG. 7 and 8 are exploded perspective views of the door lock keyhole cover 1. FIG. FIG. 7 is an exploded perspective view showing the front side of the door lock keyhole cover 1, and FIG. 8 is an exploded perspective view showing the back side of the door lock keyhole cover 1.

As shown in FIGS. 5 and 6, the base member 11 has a base main body 111 formed in a substantially columnar shape with a step, and the base main body 111 is fixed to the door lock 100 (lock by the fixing screws 112, 112. It is fixed to the case body 101). In the base main body 111, a small-diameter portion 111b is formed on the upper portion of the large-diameter portion 111a having a relatively large diameter. Reference sign CL shown in FIG. 5 represents the central axis of the base main body 111. The large-diameter portion 111a and the small-diameter portion 111b have circular outer peripheral side surfaces with the central axis CL as the center. Moreover, the code | symbol 113 in a figure represents what is called an O-ring. The O-ring has an O-shaped cross section (circular)
For example, rubber can be used as the material. Further, the heads of the fixing screws 112 and 112 are covered with a decorative cover 116 attached from above.

  The base member 11 is provided with a key operation hole 114 through which the key hole 103 communicates. In FIG. 5, the key operation hole 114 is a circular hollow portion provided at a coaxial position whose center coincides with the circular key hole 103. Specifically, a through hole formed through the base member 11 along the central axis CL direction, that is, the thickness direction of the base member 11, and a fitting type (detachable type) connected to the through hole. The key operation hole 114 is formed by the hollow portion in the key hole pipe 115. The base member 11 configured as described above is fixed to the door lock 100 with the key operation hole 114 communicating with the key hole 103.

  The base member 11 is covered with a substantially annular (ring-shaped) cover member 12 so as to cover the base member 11. More specifically, the cover member 12 is rotatably provided with the central axis CL of the base member 11 as the rotation center. The cover member 12 is an annular member in which a circular cap fitting hole 121 is formed so that the key operation hole 114 faces the outside when the cover member 12 is put on the base member 11. As will be described later, the cap member 13 is fitted into the cap fitting hole 121 during a non-locking / unlocking operation. Further, during the locking / unlocking operation, the fitting of the cap member 13 into the cap fitting hole 121 is released.

As shown in FIG. 5, in the cover member 12, a cap support portion 123 projects from an inner peripheral surface 122 located inside the cap fitting hole 121 toward the outer peripheral side surface of the small diameter portion 111 b. The cap support part 123 is a member for supporting the cap member 13, and details thereof will be described later.

  The cap member 13 is a circular lid formed so as to be fitted in the cap fitting hole 121. In the present embodiment, the cap member 13 has an outer diameter that is slightly smaller than the inner diameter of the cap fitting hole 121. One end of the shaft member 131 is fixed to the back surface side (the lower surface in FIG. 5) of the cap member 13. One end of the shaft member 131 is fixed at a position eccentric from the center of the cap member 13, and the shaft member 131 is a rotation shaft provided so as to be rotatable with respect to the base member 11.

  The base main body 111 of the base member 11 has a through hole (hereinafter referred to as “rotating shaft”) that is located on the opposite end side substantially symmetrical to the key operation hole 114 and penetrates the base main body 111 along the central axis CL. 117) (referred to as "insertion holes"). The shaft member 131 has a smaller diameter than the rotation shaft insertion hole 117, and the shaft member 131 is loosely fitted to the base member 11 by being inserted into the rotation shaft insertion hole from the front side of the base member 11. Yes. Further, the inner diameter of the rotation shaft insertion hole 117 is the smallest on the front side, and is gradually increased in two steps toward the back side (see FIG. 5). Thus, the step part formed in the location where an internal diameter expands in steps is called the 1st step part 118a and the 2nd step part 118b from the front side.

  When the door lock keyhole cover 1 is assembled, the shaft member 131 inserted into the rotation shaft insertion hole 117 of the base member 11 from the front side is accommodated in the rotation shaft insertion hole 117 from the back surface side of the base member 11. The spring member 141 is attached. One end side of the spring member 141 is in contact with the first stepped portion 118a so that it does not slip through to the front side.

  Further, a small diameter hole for inserting the stopper 143 is formed on the other end side of the shaft member 131. A washer 142 is fitted into the shaft member 131 to which the spring member 141 is attached from the other end side. The stopper 143 is inserted into the small-diameter hole of the shaft member 131 in a state where the spring member 141 is pressed by one surface of the washer 142 so as to contract. Thus, the spring member 141 is accommodated in the rotation shaft insertion hole 117 while being sandwiched between the first stepped portion 118a and the washer 142.

  Here, in a state where the spring member 141 is accommodated in the rotation shaft insertion hole 117, the spring member 141 is held in a contracted state as compared with the original shape. Therefore, the elastic restoring force that the spring member 141 tries to extend is transmitted from the shaft member 131 to the cap member 13, and acts as a biasing force that biases the cap member 13 toward the base member 11.

  Incidentally, an annular rib 132 is formed on the peripheral edge of the back surface side of the cap member 13, and the annular rib 132 is supported by the cap support portion 123 of the cover member 12. Therefore, the urging force of the spring member 141 is transmitted to the cover member 12 via the cap member 13. As a result, both the cap member 13 and the cover member 12 are urged by the spring member 141 in a direction approaching the base member 11.

  Although the detailed operation of each component will be described later, when the cover member 12 and the cap member 13 are pulled out in a direction away from the door 200 (that is, toward the front of the door) against the biasing force of the spring member 141. Think about the situation. In this case, the washer 142 moves upward in FIG. 5, but the movement is restricted by the washer 142 coming into contact with the second step portion 118b. In other words, the cap member 13 is allowed to move in a direction away from the base member 11 until it comes into contact with the second stepped portion 118b. That is, the cap member 13 is connected to the base member 11 so as to be rotatable with respect to the base member 11 and reciprocally movable in the direction of the central axis CL within a predetermined range.

  The door lock keyhole cover 1 can be unlocked and unlocked by exposing the keyhole 103 of the door lock 100 by a simple operation without using a key or a special tool for a legitimate locker / unlocker. For outsiders, the keyhole cannot be easily opened. As a unique configuration for realizing such an effect, a cam ring mechanism CRM (corresponding to the switching mechanism of the present invention) and a rotation restricting mechanism CCM are provided.

  As described above, the cover member 12 is provided so as to be rotatable relative to the base member 11 about the central axis CL of the base member 11. The cam ring mechanism CRM is interlocked with the rotation operation of the cover member 12, and the cap member 13 is released from the “embedded fitting state” in which the cap member 13 is buried in the cap fitting hole 121, and the fitting of the cap member 13 is released. This is a mechanism that can be switched between the “fitted state”.

  However, if the rotation operation of the cover member 12 is made possible at any time, it becomes easy for an outsider to switch from the buried fitting state to the mating release state, and thus the door lock keyhole cover 1 according to the present invention. Then, unless a predetermined operation different from the rotation operation of the cover member 12 is performed, a rotation restriction mechanism CCM for restricting the rotation operation of the cover member 12 is also provided. As will be described in detail later, this predetermined operation is an operation of sliding the cover member 12 in a direction away from the base member 11 along the direction of the central axis CL of the base member 11. That is, this operation can be regarded as an operation of pulling the cover member 12 toward the front of the door 200.

  Next, specific configurations of the cam ring mechanism CRM and the rotation restricting mechanism CCM will be described with reference to the drawings. FIG. 9A is a perspective view showing the front surface side of the cover member 12, and FIG. 9B is a perspective view showing the back surface side of the cover member 12. FIG. 10 is an explanatory diagram for explaining a cross-sectional structure of the cover member 12. FIG. 10A is a surface view of the cover member 12. FIG. 10B is a sectional view taken along line XX shown in FIG. FIG.10 (c) is the YY sectional view taken on the line shown to (a).

  FIG. 11 is a perspective view showing the back side of the cap member 13. FIG. 12 is an explanatory diagram for explaining a cross-sectional structure of the cap member 13. FIG. 12A is a view showing the back surface of the cap member 13. FIG. 12B is a sectional view taken along line XX shown in FIG. FIG. 12C is a sectional view taken along line YY shown in FIG. FIG. 13 is a perspective view showing the surface side of the base member 11.

  The cam ring mechanism CRM will be described. The cam ring mechanism CRM is configured by combining ring-shaped cams formed on the cover member 12 side and the cap member 13 side, respectively.

  First, a cam provided on the cover member 12 side (hereinafter referred to as “cover side cam”) will be described with reference to FIGS. 9A and 10. The cover-side cam is formed on the support surface of the cap support portion 123 that contacts the back surface of the cap member 13. As shown in the figure, the cover-side cam is composed of a cam convex portion 124a, a cam concave portion 124b, and a cam inclined portion 124c, and is a ring-shaped cam in which concave and convex shapes are repeated. Of the portions constituting the cover side cam, the cam convex portion 124a is a convex portion that relatively protrudes compared to the cam concave portion 124b, and the cam concave portion 124b is a concave portion that is recessed compared to the cam convex portion 124a. The inclined portion 124c is an inclined surface (spiral surface) located between the cam convex portion 124a and the cam concave portion 124b.

Both the cam convex portion 124a and the cam concave portion 124b are configured as planes substantially perpendicular to the central axis CL. In addition, the two cam projections 124a and the cam recesses 124b are alternately arranged at 90 ° intervals around the center axis CL. Note that the cover-side cam is configured so that the height difference between the adjacent cam projections 124a and cam recesses 124b is equal at any location.

  Next, a cam provided on the cap member 13 side (hereinafter referred to as “cap side cam”) will be described with reference to FIGS. 11 and 12. The cap-side cam is a ring-shaped cam formed on the annular rib 132 of the cap member 13 and having repeated concavo-convex shapes. The cap side cam changes the lift amount of the cap member 13 with respect to the cover member 12 by engaging with the cover side cam described above.

  Among the portions constituting the cap side cam, the cam convex portion 133a is a convex portion that relatively protrudes compared to the cam concave portion 133b, and the cam concave portion 133b is a concave portion that is recessed compared to the cam convex portion 133a. The inclined portion 133c is an inclined surface (spiral surface) located between the cam convex portion 133a and the cam concave portion 133b.

  Both the cam convex portion 133a and the cam concave portion 133b are configured as planes substantially perpendicular to the central axis CL. In addition, the two cam projections 133a and the cam recesses 133b are alternately arranged at intervals of 90 ° about the center axis CL. Note that the cap-side cam is configured so that the height difference between the adjacent cam convex portion 133a and cam concave portion 133b is equal at any location.

  Here, in the cover side cam and the cap side cam, the cam convex portions (124a, 133a), the cam concave portions (124b, 133b), and the cam inclined portions (124c, 133c) have the same shape. That is, the cover side cam and the cap side cam are configured to have a common cam profile. Therefore, when the cover member 12 and the cap member 13 are rotated relative to each other, the cover-side cam and the cap-side cam, which are the interfaces between them, are slidably contacted with each other, and the contact position is gradually changed, thereby the cover member 12 The lift amount of the cap member 13 is changed.

  For example, the cap member 13 in a state where the cam convex portions (124a, 133a) of the cover side cam and the cap side cam are engaged with the cam concave portions (133b, 124b) (hereinafter referred to as “concave engagement state”). The lift amount of the cover-side cam and the cap-side cam are engaged (overlapped) with each other (i.e., "convex-convex stacked state"). Therefore, the lift amount of the cap member 13 becomes the maximum (the maximum lift amount). Further, when the cam convex portion 124a (133a) of the cover side cam (cap side cam) is engaged (overlapped) with the cam inclined portion 133c (124c) of the cap side cam (cover side cam), the cap member 13 The lift amount is an intermediate value from the minimum to the maximum.

  Next, the configuration of the rotation restricting mechanism CCM will be described with reference to FIGS. 9B, 10 and 13. As shown in FIGS. 9B and 10, locking projections 125 are formed at the corners on the back side of the cover member 12. The shape of the locking protrusion 125 is not limited to a specific shape, but here has a rectangular parallelepiped shape by way of example. As is clear from the drawing, the cover member 12 has four locking projections 125 arranged at intervals of 90 ° about the central axis CL.

  On the other hand, as shown in FIG. 13, a fitting groove 119 is formed in the upper corner of the periphery of the large diameter portion 111 a of the base member 11. The fitting groove 119 has a shape complementary to the locking projection 125 so that the locking projection 125 of the cover member 12 can be fitted. The base member 11 has four fitting grooves 119 arranged at 90 ° intervals around the central axis CL.

  The rotation restricting mechanism CCM configured as described above restricts relative rotation of the cover member 12 with respect to the base member 11 in a state where the locking protrusion 125 and the fitting groove 119 are fitted.

  Incidentally, the cap member 13 is connected to the base member 11 so as to be reciprocally movable in the direction of the central axis CL within a predetermined range. Further, the spring member 141 biases the cap member 13 and the cover member 12 in a direction approaching the base member 11. Therefore, a legitimate locker / unlocker grasps the cover member 12 and pulls (pulls) the cover member 12 forward of the door against the biasing force of the spring member 141, so that the engagement protrusion 125 and the fitting groove 119 are fitted. The match is released. Then, the relative rotation of the cover member 12 is allowed.

  A relative position of the cover member 12 in the direction of the central axis CL with respect to the base member 11 is referred to as an “axial position”. The axial position when the locking protrusion 125 is fitted in the fitting groove 119 is defined as a first axial position (corresponding to the first position). On the other hand, the axial position when the cover member 12 is separated from the base member 11 and the engagement of the locking projection 125 and the fitting groove 119 is released is the second axial position (the first position). Equivalent). The rotation restricting mechanism CCM restricts the rotation operation when the axial position of the cover member 12 is at the first axial position, and allows the rotation operation when the axial position is at the second axial position. .

  A relative rotational position of the cover member 12 with respect to the base member 11 is referred to as a “cover rotational position”. Since the locking projection 125 and the fitting groove 119 are arranged every 90 ° around the central axis CL, the locking projection 125 is fitted into the fitting groove 119 every time the cover rotation position changes by 90 °. And a state in which the fitting is released. In other words, every time the cover rotation position changes by 90 °, a state in which the rotation operation of the cover member 12 is restricted (hereinafter referred to as “lock state”) and a state in which the restriction is released (hereinafter referred to as “lock release state”). ”).

  The cover rotation position at which switching between the locked state and the unlocked state is performed is referred to as a “lock switching position”. The lock switching position exists every 90 ° around the central axis CL. Therefore, when the cover rotation position of the cover member 12 in the unlocked state reaches the lock switching position, the locking projection 125 and the fitting groove 119 are overlapped in the central axis CL direction. Then, the cover member 12 is forcibly displaced from the second axial position to the first axial position by the action of the biasing force of the spring member 141. As a result, the locking projection 125 and the fitting groove 119 are automatically fitted, and the lock state is switched from the unlocked state.

  Next, the state of the door lock keyhole cover 1 during the locking and unlocking operation of the door lock 100 and the non-locking and unlocking operation, and the operation status when switching between them will be described. FIGS. 14 to 18 are first to fifth state diagrams showing the use state of the door lock keyhole cover.

  FIG. 14 shows a state of the keyhole cover 1 for door lock at the time of non-locking / unlocking operation. As illustrated, during the non-locking / unlocking operation, the cover member 12 is maintained in a locked state in which the locking protrusion 125 and the fitting groove 119 are fitted by the rotation restricting mechanism CCM. In this state, the cover rotation position of the cover member 12 is in the “lock switching position”. The cam ring mechanism CRM is configured such that when the cover rotation position is the “lock switching position”, the contact state between the cover-side cam and the cap-side cam is an uneven engagement state. In other words, the locking protrusion 125 and the fitting groove 119 are arranged so that the cover rotation position where the concave and convex engagement state is realized coincides with the “lock switching position”.

Further, in the present embodiment, when the contact state of the cover side cam and the cap side cam is the uneven engagement state, the surface of the cap member 13 fitted in the cap fitting hole 121 and the surface of the cover member 12 Both members are configured so that there is no step between them (so-called flush state). Therefore, when the door lock 100 is not locked / unlocked, the cap member 13 can be brought into the embedded fitting state. Incidentally, the cap member 13 covers the key operation hole 114 in the buried fitting state. In this state, since the cap member 13 cannot be grasped by hand, there is no possibility that the cap member 13 is forcibly pulled out by an outsider, for example.

  Furthermore, since the cover member 12 is in the locked state during the non-locking / unlocking operation, an outsider who does not know how to handle the door lock keyhole cover 1 cannot rotate the cover member 12. Therefore, an outsider cannot switch the fitting state of the cap member 13 from the buried fitting state to the fitting released state. Therefore, the cap member 13 is not rotated and the key operation hole 114 is not opened during the non-locking / unlocking operation, and the key hole 103 is not exposed to the outside. As a result, it is possible to prevent the door lock 100 from being illegally unlocked by the outsider during the non-locking / unlocking operation or being mischievous by the keyhole 103.

  On the other hand, for a legitimate locker / unlocker who knows how to handle the door lock keyhole cover 1, the keyhole 103 can be easily opened by the following procedure during the lock / unlock operation. That is, as in the state shown in FIG. 15, the cover member 12 is pulled out forward of the door. Thereby, the axial position of the cover member 12 is displaced from the first axial position to the second axial position, and the cover member 12 is unlocked. In this state, the contact state between the cover-side cam and the cap-side cam is still in the concavo-convex engagement state, and the cap member 13 is maintained in the buried engagement state.

  When the cover member 12 is rotated from the state shown in FIG. 15, the state shown in FIG. 16 is obtained. Here, the cap member 13 is biased toward the base member 11 by the biasing force of the base member 11. Therefore, when the cover member 12 is rotated with respect to the base member 11, the base member 11 and the cap member 13 are relatively rotated. As a result, since the contact position between the cover-side cam and the cap-side cam changes, the lift amount of the cap member 13 gradually increases according to the change in the cover rotation position in the cover member 12. The state shown in FIG. 16 is a state in which the cover member 12 is rotated by 45 ° from the state of FIG. 15, and corresponds to a state in the middle of switching from the buried fitting state to the fitting release state.

  Then, when the cover member 12 is rotated 90 ° from the state shown in FIG. 15, the state shown in FIG. 17 is obtained. If it does so, the contact state of a cover side cam and a cap side cam will be in a convex-convex stacking state, and the cap member 13 will be in a fitting cancellation | release state. At the same time, the cover rotation position in the cover member 12 coincides with the lock switching position. Then, the locking protrusion 125 and the fitting groove 119 are automatically fitted by the biasing force of the spring member 141 against the cover member 12. As a result, the cover member 12 is switched from the unlocked state to the locked state, and its rotational operation is restricted.

  A legitimate locker / unlocker can turn the cap member 13 around the shaft member 131 as shown in FIG. 18 by switching the cap member 13 to the disengaged state. Thereby, the key operation hole 114 covered with the cap member 13 can be exposed, and the key hole 103 of the lock 100 can be opened. Therefore, the lock operation of the door lock 100 can be performed by inserting the key K into the key operation hole 114 and the key hole 103.

In order to hide the cap hole 13 from the state shown in FIG. 18 so as to hide the key hole 103, the following operation may be performed. That is, the cover member 12 is pulled out forward of the door, and the cover member 12 is rotated by 90 ° with respect to the base member 11 in a state where the cover member 12 is unlocked. According to this, since the contact state of the cover-side cam and the cap-side cam becomes the uneven engagement state again, the cap member 13 can be switched to the buried engagement state.

  As described above, in the door lock keyhole cover 1 according to the present embodiment, the cam ring mechanism CRM switches between the buried fitting state and the fitting release state in the cap member 13 in conjunction with the rotation operation of the cover member 12. Do. The rotation restricting mechanism CCM is configured to switch between the locked state and the unlocked state of the cover member 12 in synchronization with the timing at which the cam ring mechanism CRM switches between the buried fitting state and the fitting released state. ing.

  According to this, it is possible to open the key hole 103 of the door lock 100 by a simple operation without using a key or special tools for a legitimate locker / unlocker. On the other hand, it is impossible for an outsider to open the keyhole 103 illegally. Therefore, it is possible to prevent the door lock 100 in the locked state from being illegally unlocked by an outsider or being damaged by mischief such as filling the keyhole 103 with a foreign object.

  As mentioned above, although embodiment which implements this invention was described, you may add a various change to above-described embodiment within the range which does not deviate from the meaning of this invention. For example, the door lock 100 to which the door lock keyhole cover 1 is applied is not limited to a specific structure, type, type, or the like. For example, the door lock 100 may be a pillar lock used in a power related facility. The pillar lock can be used by being attached to a door of an underground device such as a high-pressure cabinet, an aerial multi-circuit switch, or a ground transformer, and an entrance door of an electric room for lease.

  Further, in this embodiment, the locking projection 125 is provided on the cover member 12 side and the fitting groove 119 is provided on the base member 11 side. However, each may be provided on the opposite member. In addition, the shape, size, arrangement position, and the like of the locking protrusion 125 and the fitting groove 119 can be changed as appropriate.

  For example, a circumferential circumferential groove orthogonal to the central axis CL is formed on the outer circumferential surface of the large-diameter portion 111a of the base member 11 over the entire circumference of the outer circumferential surface, and the locking protrusion 125 of the cover member 12 is formed in this circumferential groove. The cover member 12 may be rotated relative to the base member 11 by fitting. And in the above-mentioned lock switching position, in order to switch the cover member 12 between the locked state and the unlocked state, an orthogonal groove extending in the direction of the lock case body 101 from the peripheral groove may be provided. In this case, when the locking projection 125 is fitted in the circumferential groove, the unlocked state is maintained. The cover member 12 can be switched from the unlocked state to the locked state by the locking projection 125 being pushed into the orthogonal groove through the intersection of the circumferential groove and the orthogonal groove.

DESCRIPTION OF SYMBOLS 1 Door lock key hole cover 11 Base member 12 Cover member 13 Cap member 100 Door lock 103 Key hole 114 Key operation hole 121 Cap fitting hole 124a, 133a Cam convex part 124b, 133b Cam concave part

Claims (7)

A door lock keyhole cover attached to the door lock to conceal the keyhole of the door lock,
A base member having a circular outer peripheral side and fixed to the door lock in a state where a key operation hole is communicated with the key hole;
An annular cover that covers the base member and is provided so as to be rotatable about the center of the base member, and has a cap fitting hole that is an opening hole that faces the key operation hole of the base member to the outside. Members,
A cap member that is coupled to the base member and covers the key operation hole of the base member in a state of being fitted into the cap fitting hole of the cover member;
In conjunction with the rotation of the cover member, a buried fitting state in which the cap member is buried in the cap fitting hole, and a fitting released state in which the fitting of the cap member is released. A switching mechanism for switching between
While the relative position of the cover member with respect to the base member in the central axis direction of the base member is at the first position, the rotation operation of the cover member is restricted, while the relative position of the cover member is at the first position. A rotation restricting mechanism for releasing the restriction of the rotation operation in a state of being in a second position separated from the base member,
Comprising
Keyhole cover for door lock. In the cap fitting hole in the cover member, a cap support portion for supporting a peripheral portion of the cap member is formed,
The switching mechanism includes a cover-side cam formed in an annular shape on the cap support portion and a cap-side cam formed in an annular shape on a peripheral edge portion of the cap member, and interlocks with the rotation operation of the cover member. Changing a lift amount of the cap member with respect to the cover member by changing a contact position between the cover-side cam and the cap-side cam;
The keyhole cover for door locks according to claim 1. Each of the cover-side cam and the cap-side cam has a cam protrusion that protrudes relatively and a cam recess that is recessed compared to the cam protrusion,
The cap member enters the embedded fitting state by engaging the cam convex portion and the cam concave portion in the cover side cam and the cap side cam,
The cap member is in the disengaged state when the cam convex portions of the cover side cam and the cap side cam overlap each other.
The keyhole cover for door locks according to claim 2. In each of the cover side cam and the cap side cam, a plurality of cam convex portions and cam concave portions are alternately arranged, and adjacent cam convex portions and cam concave portions are connected by an inclined surface.
The keyhole cover for door locks according to claim 3. The rotation restricting mechanism includes: a locking protrusion provided on one of the cover member and the base member; and a fitting groove provided on either of the cover member and the locking protrusion. Comprising, and
When the cover member is in the first position, the locking protrusion and the fitting groove are fitted, and when the cover member is in the second position, the locking protrusion and the fitting are fitted. Groove fitting is released,
The keyhole cover for door locks as described in any one of Claim 1 to 4. Biasing means for biasing the cover member in a direction in which the cover member is displaced from the second position to the first position;
When the locking projection and the fitting groove overlap with each other in the central axis direction of the base member as the cover member rotates, the latching projection and the fitting are applied by the biasing force of the biasing means. Groove fits automatically,
The keyhole cover for door locks according to claim 5. When the rotation position of the cover member coincides with the switching position between the buried fitting state and the fitting release state, the locking protrusion and the fitting groove are the center axis of the base member. The locking protrusion and the fitting groove are arranged so as to overlap in the direction,
The keyhole cover for door locks of Claim 6.

Images