JPH066845B2 - Locking device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device that is preferably used for opening and closing a lid in a common groove for wiring, and more particularly to a locking device that locks and unlocks by rotating a latch. Regarding the device.

2. Description of the Related Art Generally, in the common groove for wiring, etc., the main body of the common groove is closed with a lid for the purpose of protection of wiring, safety, etc., and a locking device is used to prevent the common groove from being opened excessively. There is. In these locking devices, the locking device is embedded in a concrete lid to expose the latch, and the latch is horizontally rotated in a fixed position inside the common groove main body (inside the inner surface of the common groove main body) to the inner wall of the common groove main body. It is designed to lock and unlock the lid by engaging and disengaging the provided latch.

Problems to be Solved by the Invention Therefore, when the latch projects from the inner surface of the lid, when the lid is removed and placed directly on the ground, the weight of the lid may damage the latch and make it unlockable. There is.

Also, when the horizontal rotation position of the latch on the lid side is fixed, it cannot be used for the common groove body with different latching positions, lacking compatibility, and locking the common groove of various standards respectively. It is uneconomical to prepare the device.

Also, when the horizontal rotation position of the latch on the lid side is fixed and there is no error absorbing means, especially in the concrete joint groove where molding accuracy is not expected, when molding the locking device by embedding in the concrete lid body There is a possibility that compatibility with the common groove side latching etc. may not be obtained due to errors etc.

The present invention provides an optimum locking device which is effectively used to solve the above problems and is used for a lid of a common groove for wiring and the like.

Means for Solving the Problems As the above means, the present invention inserts a latch shaft into a cylinder to allow a latch provided at a lower end of the cylinder to enter and exit a latch provided at a lower end opening of the cylinder. The shaft is slidably engaged with the latch rotation cam member provided inside the cylinder through the axial groove cam and the slider, and the latch rotation cam member and the cylinder are relative to the axis. Through a grooved cam and a slider of a slanted track, rotatably slidably along the grooved cam, and further, a latch operation screw member is screwed into the upper end opening portion of the cylindrical body so as to advance and retreat in the axial direction. The latch turning cam member is rotatably suspended on the latch operating screw member.

With the above structure, when the latch operating screw member is rotated in one direction, the latch rotating cam member descends while being rotated by a fixed amount in accordance with the grooved cam of the inclined track, and the slider reaches one end of the grooved cam. The pivoting cam member is prevented from pivoting and descending, and therefore the latching screw member is prevented from pivoting, so that a fixed amount pivoting of the latch described below is guaranteed.

When the latch rotating cam member rotates and descends, the latch shaft and the latch rotate by a fixed amount using the slider held by the axial groove cam as a motion transmitting point, and engage with the latch of the common groove main body, for example. To lock. Or, conversely, the lock is released by a fixed turn of one of the latches.

At this time, the lock shaft can be locked (unlocked) by rotating the latch shaft and the latch at a fixed position so as to absorb the descending amount of the latch rotating cam member by the guiding action of the groove cam in the axial direction. . On the contrary, when the latch operating screw member is rotated in the other direction, the latch rotating cam member is pulled up by the groove cam of the inclined track while being rotated by a fixed amount contrary to the above, and the slider is pulled by the groove cam. Of the latch rotation cam member is prevented from rotating and ascending to the other end of the latch, and thus the latch operation screw member is prevented from rotating, and the fixed rotation of the latch in the opposite direction is guaranteed. .

When the latch rotating cam member descends while rotating, the latch shaft and the latch rotate a fixed amount contrary to the above with the groove cam and the slider in the axial direction as the motion transmitting points, and the engagement with the latch stop is released. And then unlock it. Or, conversely, the lock is obtained by the fixed rotation of the latch.

At this time, as in the case of the forward rotation, the lock cam is released while the upward movement of the latch rotation cam member is absorbed by the guiding action of the groove cam in the axial direction and the latch shaft is held at the fixed position. Can be made.

The latch shaft can move up and down according to the axial groove cam regardless of the above operation and non-operation, whereby the latch can be housed in the latch housing case, that is, inside the lid.

Embodiment An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 6.

1 is a latch shaft, and the latch shaft 1 has a latch 11 at its lower end.
Each has a slider 12 that projects laterally at its upper end, and a descent stop 13 in the middle of the shaft portion.

Reference numeral 2 denotes a latch rotation cam member. The latch rotation cam member 2 is composed of a cylindrical member, and has a groove wall 21 extending in the axial direction as shown in the drawing on the cylinder wall and a groove having an oblique orbit with respect to the axis line. It has a cam 22 and a hanging hole 23 at the center of the upper end. The grooved cams 21 and 22 are provided in pairs so as to be axially symmetrical with their phases shifted by 90 °.

FIG. 3 shows an example in which the latch turning cam member 2 is formed by sheet metal working.
The half-divided cylindrical body 24 punched out and bent in an arc shape is arranged to face each other to form a cylindrical body, and the groove cam 21 in the axial direction is formed in the slot between the plate thickness facing surfaces of the half-divided cylindrical body 24. Then, the half-split cylindrical body 24 is preliminarily connected at its upper end and punched,
The shape of the tubular body is maintained by the connecting piece 25, and at the same time, the hanging hole 23 is formed by punching in the connecting piece 25 at the center of the tubular body. Depending on the implementation, the lower end of the groove cam 21 is terminated by a lowering stopper 26 protruding from the lower end of the half-split cylindrical body 24.

The above-described embodiment provides the latch rotation cam member 21 which is easy to process the both groove cams 21 and 22 at low cost.

When the latch rotation cam member 21 is a solid bottomed cylinder, the grooved cams 21 and 22 are cut on the cylinder wall and the mounting hole 23 is cut on the bottom wall.

A latch operation screw member 3 has a circular shape, and has a male screw 31 on the outer peripheral surface, a tool tip engagement hole 32 on the upper end surface, and a hanging protrusion 33 on the center of the lower end surface.

An outer cylinder 4 is provided with an internal thread 41 on the inner peripheral surface of the upper opening of the outer cylinder 4, and the latch operating screw member 3 is screwed onto the internal thread 41 to form a hermetically sealed structure. The latch operating screw member 3 may be a female screw member that is screwed onto the outer peripheral surface of the upper end opening of the outer cylinder 4.

The latch rotation cam member 2 is rotatably suspended from the latch operation screw member 3 so that the latch rotation cam member 2 is placed inside the outer cylinder 4.
A slider 42 protruding inward from the cylinder wall of the outer cylinder 4 is slidably engaged with the grooved cam 22 of the oblique track of the latch pivoting cam member 2. The latch rotation cam member 2 rotates while being lowered or raised by the guide of the groove cam 22. That is, it rotates obliquely around the axis.

As an example of suspending means for the latch rotating cam member 2, the suspending protrusion 33 provided on the latch operating screw member 3 is inserted into the suspending hole 23 of the latch rotating cam member 2 and is attached to the retaining ring 34. And connect so that it cannot be removed.

Further, the latch shaft 1 is inserted into the outer cylinder 4, the upper end of the latch shaft is inserted into the latch rotating cam member 2, and the projection 12 thereof is provided on the cam member 2 in the axial groove cam 21.
It is slidable and movable in the axial direction, and in the slidable state, the latch 11 can be moved in and out through the lower end opening of the outer cylinder 4. The lower end of the groove cam 21 is opened, or a descent stop 26 is provided as in the embodiment to limit the descent of the slider 12. Further, the lowering stopper 13 provided in the middle of the latch shaft 1 is engaged with the stopper 43 which is provided at the lower end of the outer cylinder 4 so as to project inward, and the maximum protrusion amount of the latch 11 from the outer cylinder 4 is set.

The outer cylinder 4 has a latch accommodating case 44 provided at the lower end opening thereof, and an opening edge of the latch accommodating case 44 communicating with the outer cylinder 4 is extended inward to serve as a stopper 43 of the latch shaft 1.

As shown in FIG. The locking device is embedded with outer cylinders 4 at two corners or four corners on a diagonal of the joint groove cover body 6, for example.
The latch accommodating case 44 is embedded in the inner surface of the lid body 6 in an installed state, and the upper end opening is opened to the outer surface of the lid body. In the embedded state, the latch 11 projects from the latch housing case 44 to a lower portion of the inner surface of the lid body 6, rotates in the projected state, and disengages from, for example, the latch stop 7 of the common groove body. Further, the latch 11 can freely move up and down together with the latch shaft 1 according to the axial groove cam 21 in the disengaged state.

Reference numeral 5 denotes a tool for rotationally operating the above-mentioned latch operating screw member 3, and a tool tip of the screw portion 51 screwed to the female screw 41 at the upper end opening of the outer cylinder 4 at the lower end and the latch operating screw member 3. It has a tool tip 52 that engages with the dowel hole 32, and a hook 5
Have three.

With the above structure, the tool tip 52 of the tool 5 is inserted into the engagement hole 32 of the latch operating screw member 3, and the male screw 51 of the tool 5 is screwed into the female screw 41 of the outer cylinder 4 while rotating in one direction. When the latch operating screw member 3 is rotated in the same direction as the latch operating screw member 3, the latch rotating cam member 2 is moved downward by a fixed amount according to the groove cam 22 of the inclined track, and the slider 42 is attached to one end of the groove cam 22. Thus, the rotation and lowering of the latch rotation cam member 2 are blocked, and accordingly, the rotation of the latch operation screw member 3 is blocked, and the fixed rotation in one direction of the latch described below is guaranteed.

When the latch rotation cam member 2 rotates and descends,
The latch shaft 1 and the latch 11 rotate by a fixed amount using the slider 12 held by the axial groove cam 21 as a motion transmitting portion, and are engaged and locked by, for example, the latch stop 7 of the common groove body. On the contrary, the lock is unlocked by rotating the latch 11 in a fixed direction in one direction.

At this time, the lowering amount of the latch rotating cam member is absorbed by the guiding action of the grooved cam 21 in the axial direction, and the latch 11 is supported in a fixed position by the lowering stopper 13 and the stopper 43 while the latch 11 is locked in the locking direction ( It can be rotated in the unlocking direction).

To restate, when the screw member 3 for latch operation is rotated and lowered in one direction using a tool, the latch rotating cam member 2 is pushed down by the screw member 3 and is lowered, and the cam member 2 is lowered. Then, sliding is caused between the grooved cam 22 and the slider 42 on the oblique track, and the guiding action thereof induces the rotation of the rotating cam member 2 in one direction. That is, the cam member 2 rotates while being pushed down by the screw member 3. Therefore, as described above, the cam member 2 is rotatably suspended on the screw member 3.

Thus, when the cam member 2 rotates in one direction, the inner wall of the grooved cam 21 in the axial direction presses the slider 12 protruding from the latch shaft 2 in the circumferential direction to move the latch shaft 2 and the latch 11 in one direction. It is rotated to form a locked state (or unlocked state). When the slider 42 reaches one end of the grooved cam 22 of the oblique track, the rotation of the cam member 2 is blocked, and therefore the pressing of the cam member 2 by the screw member 3 becomes impossible and the screw member 3 cannot descend further. . As a result, the latch shaft 1 and the latch 11
The fixed amount of rotation required to form the locked state is guaranteed.

On the other hand, regardless of the fact that the cam member 2 and the screw member 3 are prevented from rotating in one direction and being lowered, the latch shaft 1 is provided with a slider 12 which is slidably engaged with an axial groove cam 21. It can move up and down independently. This vertical movement causes latch 1
The error between 1 and the latch stop 7 can be absorbed, and both 11 and 7 can be reliably engaged.

In contrast to the above, when the tool 5 is rotated in the other direction to rotate the latch operating screw member 3 in the same direction, the latch rotating cam member 2 follows the grooved cam 22 of the inclined track, and the reverse of the above. The slider 42 is pulled up while rotating in a fixed amount, and
2 to the other end of the latch rotation cam member 2 is prevented from rotating and ascending, so that the latch operation screw member 3 is prevented from rotating in the other direction. A fixed rotation of the direction is guaranteed.

That is, when the latch rotating cam member 2 is raised while rotating, the latch shaft and the latch rotate by a fixed amount contrary to the above with the sliding contact between the axial groove cam 21 and the slider 12 as a motion transmitting point, and the latch is latched. The engagement with the stopper 7 is released and the lock is released. Or, conversely, the latch is engaged with the latch 7 by a fixed amount of rotation in the other direction to lock.

At this time, as in the case of the forward rotation, the guide action of the grooved cam 21 in the axial direction absorbs the rising amount of the latch rotating cam member 2 and the latch shaft 1 is supported at a fixed position by the lowering stopper 13 while the above-mentioned operation is performed. The lock can be released.

To restate, when the screw member 3 for latch operation is rotated and raised in the other direction using a tool, the cam member 2 for latch rotation is pulled up by the screw member 3 and rises, and when the cam member 2 rises. Sliding is caused between the grooved cam 22 and the slider 42 on the oblique track, and the guiding action thereof induces the turning cam member 2 to turn in the other direction. That is, the cam member 2 rotates while being pulled up by the screw member 3. Therefore, as described above, the cam member 2 is rotatably suspended on the screw member 3.

Thus, when the cam member 2 rotates in the other direction, the inner wall of the grooved cam 21 in the axial direction presses the slider 12 projecting from the latch shaft 2 in the circumferential direction to move the latch shaft 2 and the latch 11 in the other direction. It is rotated to form an unlocked state (or locked state). When the slider 42 reaches the other end of the grooved cam 22 on the oblique track, the rotation of the cam member 2 is prevented, and therefore the cam member 2 cannot be pulled up by the screw member 3 and the screw member 3 cannot be further raised. Become. As a result, the latch shaft 1 and the latch 1
The fixed rotation required for the formation of the unlocked state of 1 is guaranteed.

On the other hand, regardless of the fact that the cam member 2 and the screw member 3 are prevented from rotating and descending in the other direction, the latch shaft 1 is singly separated by the slider 12 that is slidably fitted to the axial groove cam 21. It can be moved up and down freely. This rising movement causes the latch 11
Can be freely stored in the latch storage case 44.

That is, the latch shaft 1 can be moved up and down in accordance with the axial groove cam 21 regardless of the above-mentioned operation and non-operation, whereby the latch 11 is housed in the outer cylinder 4, that is, the housing case 44 and housed inside the lid. it can.

For example, as shown in FIG. 6C, when the lid 6 is placed directly on the ground 9, the latch 11 is hidden inside the lid.

In the above-described embodiment, the protruding position of the latch 11, that is, the horizontal rotation position is set by the lowering stopper 13 provided on the shaft portion of the latch shaft 1, but the lowering stopper 13 is not provided, and as shown in FIG. 6B. The lower surface of the latch 11 is a support surface on the side of the latch stopper 7,
For example, it is possible to adopt a structure in which the supporting surface 8 defined on the inner wall of the common groove body is supported, and the latch is rotated while sliding the supporting surface to engage and disengage in the groove for latching. Even if there is an error or a standard difference in the height of 8, the latch shaft 1 and the latch 11 are attached to the support surface 8 according to the axial groove cam 21.
The groove cam 21 absorbs the difference and locks and unlocks.

Even if there is the above-mentioned descent stopper 13, the latch shaft 1 and the latch 11 can be moved up and down with the groove cam 21 with this as the bottom dead center.
Using the vertical movement, the latch 11 can be properly locked and unlocked while being supported by the support surface 8 having a difference from the latch 11.

In the above-described embodiment, the latch rotating cam member 2 is formed into a cylindrical body and the latch shaft 1 is inserted into the cylindrical body. However, the latch rotating cam member 2 is not a cylinder but a broken cylinder such as a semi-cylinder. The structure may be such that it is attached to the shaft.

The latch turning operation tool 5 is screwed into a lock device arranged at a corner of the lid 6 in a common groove or the like with a screw portion 51, and is lifted with a lifting hand 53. It also functions as a means.

EFFECTS OF THE INVENTION According to the present invention, since the latch can freely move up and down according to the axial groove cam, even when the lid body to which the locking device is attached is removed and placed directly on the ground, the latch follows the axial cam groove. Rises together with the latch shaft, and the latch can be stored in the latch storage portion, and it is possible to effectively prevent damage to the latch and each part that moves the latch with a high-weight lid during direct installation.

In addition, the oblique groove cam and the slider guarantee the fixed amount of rotation of the latch in the forward and reverse directions, and the axial groove cam and the slider rotate the fixed amount of the latch operation screw member and the latch rotation cam member. The motion is accurately transmitted to the latch shaft, the latch and the latch stop can be locked and unlocked properly, and the locking failure can be reliably prevented.

Further, when the latch operation screw member and the latch rotation cam member descend while rotating, the vertical movement component is absorbed by the grooved cam in the axial direction, and the latch shaft receives only the rotation component to constantly fix the latch. It can be rotated horizontally at the position to engage and disengage with the latch stopper. Even if there is some dimensional error, it is possible to engage the latch while adjusting the latch upward by following the axial groove cam if the latch is provided or the introduction portion of the latch is inclined.

Further, by utilizing the structure in which the latch shaft can move up and down with respect to the latch rotating cam member in accordance with the axial groove cam, the vertical position of the latch is set to the mating device, for example, the latching position of the common groove for wiring. At the same time, it can be pivoted at a suitable position for engagement and disengagement, and the locking device can be provided with compatibility that can be used even for joint grooves of different types having different latching positions. Target.

[Brief description of drawings]

FIG. 1 is a perspective view showing a locking device according to an embodiment of the present invention with a part thereof cut away, FIG. 2 is a perspective view of a latch shaft, FIG. 3 is a perspective view of a latch rotating cam member, and FIG. Is a perspective view of the latch operating screw member, FIG. 5 is a cross-sectional view of the latch operating screw member and a latch turning cam member suspended from the latch operating screw member, and FIGS. 6A, 6B, 6C are cross-sectional views of the locking device. Yes, FIG. A shows a locked (unlocked) state, FIG. B shows an unlocked (locked) state, and FIG. C shows a state of being directly placed on the ground. DESCRIPTION OF SYMBOLS 1 ... Latch shaft, 11 ... Latch, 12 ... Slider, 2 ... Latch rotation cam member, 21 ... Axial grooved cam, 22 ... Oblique track grooved cam, 3 ... Latch operation screw member, 31 ... Male screw, 32 ... Tool tip engaging hole, 4 ... Outer cylinder, 41 ... Female screw, 4
2 ... slipper.

Front page continuation (72) Inventor Hirohiko Kaneko 1-6-3 Misora, Yotsukaido City, Chiba Prefecture (72) Inventor Yoshikazu Hirooka 4-27-18 Toganecho, Katsushika-ku, Tokyo

Claims (1)

[Claims] An outer cylinder (4) having a latch housing (44) having a threaded portion (41) opened at the other end at one end of the cylinder and further having a slider (42) protruding inward from the cylinder wall, and the outer cylinder (4). A screw member 3 for latch operation, which is screwed into the screw portion 41, and a cylindrical body inserted into the outer cylinder 4 and having one end rotatably hung on the screw member 3 in the axial direction on the cylinder wall. Groove cam 21 extending to
And a latch rotation cam member 2 having a groove cam 22 that is formed in an oblique orbit with respect to the axial direction and that slides with the slider 42,
The latch pivot cam member 2 is inserted into the inside of the latch pivot cam member 2 and has a slide shaft 12 projecting at one end and slidingly fitted to the groove cam 21 and a latch shaft 1 having a latch 11 at the other end. Locking device.