Slide latch lock for door

Abstract

To provide a slide latch lock with a more simplified latch lock mechanism, which also has good operability.SOLUTION: A slide latch lock comprises a latch case and a slide latch. In the latch case, an operation window having a finger hook portion formed on a vertical end inner face is provided. In the slide latch, a latch head capable of protruding from / retracting into a door end face and an operation recess part are provided. A cross section of the operation recess part is substantially trapezoidal, and a hinge-side inner face is an inclined guide face. The slide latch is assembled inside the latch case along with a spring member to constitute the slide latch lock. After being installed in a door, a decorative cover having an operation hole is attached. In a locked state, the inclined guide face is completely exposed from the operation window. When a finger etc. is inserted in the operation recess part, the inclined guide face is naturally pushed, and the slide latch is moved in the hinge-side direction to be unlocked. Then, a continuous movement of pulling the finger hook portion or pushing a deep face of the operation recess part opens / closes the door.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a slide-operated latch lock that is attached to a door. [Background technology]

[0002] Generally, a latch lock and its operating member attached to a door 27 are conventionally called a lever handle lock, and are known to be locked and unlocked by gripping and rotating a rod-shaped handle 22 as shown in Fig. 18. The above configuration comprises a surface-mounted operating member consisting of a handle 22 with a square shaft 24 and a base 21, which are attached to the outside and inside of the room so as to sandwich the door 27, and a box-shaped latch case 1 that is recessed into the thickness of the door end side of the door 27. The mechanism is such that the square shaft 24 fixed to the handle 22 penetrates a square hole 25 of a hub 23 provided in the latch case 1 to link the latch case 1 and the handle 22, and the hub 23 rotates together with the square shaft 24 by rotating the handle 22 downward, and the rotation of the hub 23 causes the latch head 9 to appear and disappear from the latch receiver provided on the vertical frame 26, thereby locking and unlocking.

[0003] In addition, these handles 22 are relatively long in the horizontal direction so that they can be gripped by hand and operated, and it is assumed that when a user grips the tip of the handle 22 and puts his / her body weight on it to operate it, a very large load is applied to the square shaft 24 of the handle 22 and the hub 23 inside the latch case 1, causing the square shaft 24 to twist and the hub 23 to break, so that both are designed to be very strong in the current product. In addition, the application of a similar load frequently causes the fixed portion of the square shaft 24 and the handle 22 to become unsteady after long-term use, which is considered to be a problem, and solutions have been reported in JP 2004-3356 A, JP 2006-104857 A, etc.

[0004] Furthermore, in the case of a lever handle type that locks and unlocks by rotating the handle 22, whether the door 27 is pushed open or pulled open, the handle 22 must be rotated downward at a certain angle, held in that position, and the door 27 must be pushed and pulled in that position, which requires a relatively large movement. Also, the handle 22 is designed to be operated by gripping it with the hand, which means that the grip of the handle 22 must be placed at a position quite far away from the door surface. This inevitably results in the tip of the handle 22 sticking out from the door surface, which frequently causes clothes to get caught on the tip of the handle 22 and tearing it, or the strap of a bag to get caught on it and break it when passing through.

[0005] Therefore, the present inventor reported in JP 2019-015070 A an operating handle for a latch lock that does not protrude too far from the door surface, does not pose a risk of catching a bag or clothes, and does not allow a load larger than necessary to be applied to the handle itself. The configuration is as follows: first, the latch lock is configured to be locked and unlocked by rotating a conventional square shaft, and a square shaft is inserted into the square hole of the latch lock, and gears are attached to both ends of the square shaft in a state where they cannot rotate with respect to the square shaft. Then, gears are arranged on both outsides of the latch case, and the angular shaft rotates due to the rotation of the gears, allowing the latch head to appear and disappear. Then, an operating member that is restricted to be movable only in the left and right directions with respect to the latch case is provided, and two rack parts are formed on the operating member, and the rack parts are configured to be arranged on both sides of the latch case. Furthermore, with both rack parts engaged with both gears, the operating member and the latch case are assembled via a spring member, and are arranged in a state of being dug into the door end side of the door. Then, holes are made in both door surfaces so that only the operating surface of the operating member is exposed, and a decorative cover is placed over it to configure a sliding latch lock.

[0006] Then, by inserting a finger or the like to move the operating surface of the operating member left and right, the square shaft rotates together with the gear engaged with the rack portion, causing the latch head to sink, and the door can be opened and closed by pushing and pulling it. Also, if left as is, the operating member will return to its original position due to the spring member. However, the unlocking means of this latch lock is ultimately achieved by the movement of the latch head in the lateral direction, and the latch locks that are currently frequently used are set to make the latch head appear and disappear in the lateral direction by a single mechanism that rotates the handle. In contrast, the above configuration is a double configuration in which the linear movement of the latch head is first converted into a rotational movement and then converted into a linear movement again, which cannot be denied as being inefficient. Therefore, it is assumed that a configuration that directly performs the unlocking operation in the lateral direction would be better. [Patent Document 1] JP 2004-3356 A [Patent Document 2] JP 2006-104857 A [Patent Document 3] JP 2019-015070 A DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0007] The present invention has been made to solve the problems described above, and aims to propose a sliding latch lock that simplifies the latch lock mechanism while also providing good operability, as well as to make the protruding portion of the handle, which may catch on bag straps or clothing, even thinner and more flush. [Means for solving the problem]

[0008] In the present invention, the following technical means are taken to achieve the above object. In order to distinguish between the two sides of the door, the side where the door is pulled to open is referred to as the front side, and the side where the door is pushed to open is referred to as the back side. First, a latch case having a front surface and a case part, and a slide latch having a latch head and a slide part are provided. The case part of the latch case has operation windows on both sides that are parallel to both door surfaces when installed, and a finger hook part is formed on the inner surface of the vertical end of the operation window. The slide latch has a latch head that appears and disappears from the door end surface, and a slide part that can move only left and right inside the case part, and the slide part has an operation recess that allows a finger or the like to be inserted from both sides of the door to perform a slide operation. The operation recess is formed vertically long and has a cross section that is approximately trapezoidal, and the inner surface of the approximately trapezoidal hanging side is set as an inclined guide surface.

[0009] Next, the slide latch is assembled together with the spring member into the latch case to form a slide latch lock. At this time, the operation window of the latch case and the operation recess of the slide latch are arranged in a state where they overlap, and in the locked state where the latch head protrudes, the inclined guide surface is set to be completely exposed from the operation window. Then, the latch lock is attached in a state where it is recessed from the door end surface, and holes for fitting the decorative cover are provided on both sides of the door so that the operation recess of the slide latch is exposed, and a decorative cover having an operation hole is attached so as to cover the decorative cover fitting hole. Then, when a finger or the like is inserted into the operation recess of the slide latch from the operation hole, the inclined guide surface is naturally pushed and the slide latch is moved toward the hanging side, and the latch head is lowered to enter the unlocked state. In this state, the operation recess has already moved, making it possible to pull the door by hooking the finger hook, and the door can be opened and closed by continuously pulling the finger hook toward the user or pushing the back surface of the operation recess.

[0010] Here, when the slide latch lock of the above configuration is installed on an actual door, it is recessed from the door edge surface, and in the case of a wooden door, it is necessary to leave a certain thickness on both sides, which results in a limit to the thickness of the case part of the slide latch lock. In addition, the operation recess of the slide latch is provided in two places on the front side and the back side so that it can be operated from both sides of the door, but if it is set at the same position from both sides, the depth of the operation recess of the slide latch cannot be secured sufficiently, and there is a concern that it will hinder operability when inserting a finger, etc. Therefore, as a first means to eliminate the above concern, first, the operation recess on the front side is provided at a position separated by a predetermined distance from the door edge surface toward the hanging side, and the operation recess on the back side is provided at a position separated by a predetermined distance toward the hanging side, and the two are shifted so that they do not overlap horizontally, thereby making it possible to secure a sufficient depth of the operation recess. In addition, in the means of setting two operation recesses shifted horizontally, the door stop of the vertical frame will cover the vicinity of the door edge on the back side when the door is closed, so it is preferable to set the operation recess on the front side closer to the door edge surface.

[0011] However, in the above case, the position of the decorative cover fitting hole is different on the front side and the back side of the door, so it is assumed that it is still insufficient in terms of being usable on both the left and right sides of the door. Furthermore, the position of the decorative cover from the door edge is also different on the front side and the back side, so there is still room for improvement in terms of design. The easiest way to solve this problem is to simply make the horizontal size of the decorative cover the same so that the design is similar on both sides. It is also good to use a decorative cover that is larger in the horizontal direction, provide a large recess in the same position so that both operation windows are exposed on both sides of the door, and make the decorative cover have the same shape of the operation hole and a shape that can be fitted into the large recess without rattling. This makes it possible to eliminate left and right preference due to the recess shape.

[0012] As a second means of ensuring sufficient depth for the operating recess, a similar operating recess is provided at a position a certain distance away from the door end surface toward the hinge point, but it is advisable to provide the operating recess on the front side above the latch head of the slide latch and the operating recess on the back side below it so that they do not overlap vertically. In addition, with this configuration, either the operating recess on the front side or the operating recess on the back side can be on the top or bottom, and there is no restriction on left or right hand orientation, which is advantageous.

[0013] The above is the setting for a wooden door with a typical thickness of 36 mm or 33 mm, and it is assumed that the above configuration is effective for adapting to these doors. However, in the case of an extremely thick door, or a door with a door end made of hollow aluminum extrusions, it is possible to increase the thickness of the latch case. For example, in the case of a thick wooden door, the thickness of the latch case is set to the maximum thickness that can be carved into the door thickness, the operation recess is located at a position a predetermined distance away from the door end surface toward the hanging side, the position and shape of the operation recess on both the front side and the back side are set symmetrically with respect to the center line of the door thickness, and the surface portion separating the two operation recesses is made thin to ensure the depth when inserting a finger, etc., making it possible to configure the configuration with sufficient consideration given to operability. As a result, it is assumed that the operation recesses on the front side and the back side can be located in the same position depending on the conditions.

[0014] Also, if it is absolutely necessary to set the front and back sides at the same position for a door of normal thickness, it is possible to form the operation recess of the slide latch with a substantially rectangular operation through hole, and provide an inclined guide surface on both sides of the operation through hole. In this case, the operation window of the latch case and the decorative cover fitting hole provided in the door are also arranged at the same positions on both the front and back sides of the door, and further, a flap member is provided on the decorative cover via a torsion spring so that it can rotate freely and always return to a position parallel to the door surface. This flap member is intended to prevent the other side of the door from being visible from the above-mentioned operation recess, which is formed with a substantially rectangular operation through hole, and is characterized in that it has a different design that is flush with the decorative cover, while the above-mentioned operation recess remains a deep recess shape. In operation, the slide latch is unlocked by moving the slide latch on the inclined guide surface while the flap member is pushed in, and the door can be opened and closed by pushing and pulling it.

[0015] In the above, the latch head is integrated with the slide part, but it is also possible to divide the slide latch into a latch head and a slide member with two operating recesses so that the latch head can rotate relative to the slide member, or to attach the latch head so that it can appear and disappear within the slide member via a spring member for the latch head. In these cases, even after it has been attached to the door, it is possible to change the left-right orientation of the slide latch lock by rotating the latch head with only the front plate of the slide latch lock removed. Effect of the Invention

[0016] This provides a new latch lock configuration that allows the door to be unlocked with the very simple action of inserting a finger or the like into the operating recess of the slide latch lock from either side of the door and moving the slide latch toward the hanging side, and then allowing the door to be opened and closed by continuing to hook the finger grip and pulling the door or by pressing into the back surface of the operating recess.

[0017] By providing an inclined guide surface in the operation recess of the slide latch, when a finger or the like is inserted into the operation recess, the inclined guide surface is naturally pressed, making it possible to easily perform the unlocking operation.

[0018] By arranging the operation recesses of the slide latches so that they are offset horizontally on the front and back sides of the door, it is possible to obtain a sufficient depth of the operation recesses required for operation, and it is possible to improve operability. Similarly, operability can be improved by arranging the operation recesses of the slide latches so that they are offset vertically.

[0019] By using a decorative cover that is larger in the horizontal direction, providing a large recess that exposes both operation windows at the same distance from the door end face, and making the decorative cover shaped so that it can be fitted into the large recess without rattling, it is possible to eliminate the left and right handedness of the door due to the recess shape and to make the decorative covers on both sides of the door have a similar design.

[0020] Even with doors of a commonly used thickness, the operating recess of the slide latch can be formed as an approximately rectangular operating through hole, and a flap member can be freely rotatably attached to the decorative cover via a torsion spring so that it always returns to a position parallel to the door surface.This makes it possible to unlock the door by moving the slide latch while the flap member is pressed in, and then open and close the door by pushing and pulling it in that state.

[0021] In any configuration, only the thickness of the decorative cover protrudes from the door surface, resulting in a flat design that is excellent in design. Furthermore, in a configuration in which a flap member is attached to the decorative cover, even the operation recess can be hidden, making it possible to create a design with even less projections and recesses.

[0022] By dividing the slide latch into a latch head and a slide portion and using a configuration in which the latch head can be raised and lowered within the slide portion via a spring member for the latch head, it is possible to change the left-right orientation of the slide latch lock by removing only the front member of the slide latch lock and rotating the latch head, even after it has been attached to the door.

[0023] It has a very simple structure consisting of only a latch case, slide latch, front panel and decorative cover, and can be manufactured inexpensively with fewer parts than conventional lever handles which require a latch lock, a relatively large base and a handle. BEST MODE FOR CARRYING OUT THEINVENTION

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a top cross-sectional view showing a locked state in which the slide latch lock of the present invention is attached to a door 27 and the latch head 9 is inserted into the latch receiver provided on the vertical frame 26. In the following, as also shown in FIG. 1, the side where the door 27 is pulled to open is referred to as the front side, and the opposite side where the door 27 is pushed to open is referred to as the back side. FIG. 2 is a perspective view of a state in which a metal front plate 7 is superimposed on a latch case 1. The latch case 1 is composed of a brim-shaped front surface 2 and a case part 3. A square hole 6 for the latch head to appear and disappear is provided on the front surface 2, and a rectangular operation window 4 is provided on each of both sides of the case part 3 arranged parallel to the door surface. At this time, the operation windows 4 provided in two places are set in a state where they are shifted by a predetermined dimension in the horizontal direction. The vertical inner surfaces of both operation windows 4 on the hanging side are set as finger hook parts 5. The square hole 6 for the latch head to appear and disappear is also provided on the front plate 7.

[0025] Fig. 3 is a top view of the slide latch 8, and Fig. 4 is a front view. As shown in Figs. 3 and 4, the slide latch 8 consists of a latch head 9 located at the tip and a roughly rectangular parallelepiped slide portion 10, and two operation recesses 11 that are vertically long and have a roughly trapezoid upper cross-sectional shape are formed in the slide portion 10. These two operation recesses 11 are arranged so that the wider side of the roughly trapezoid shape faces outward as shown in Fig. 3, and are arranged so as not to overlap each other with a predetermined horizontal offset. The inner surface of the roughly trapezoid shape on the hanging side is formed as an inclined guide surface 12.

[0026] Next, as shown in FIG. 5, the slide latch 8 is assembled into the latch case 1 together with the spring member 13 to form a slide latch lock. At this time, the operation recesses 11 on both sides of the slide latch 8 are configured to overlap and face the operation window 4 of the case part 3 of the latch case 1 with a predetermined offset from each other. At the same time, in the locked state of FIG. 5 where the latch head 9 is most protruding, the inclined guide surfaces 12 of both operation recesses 11 arranged alternately are set to be completely visible through the operation window 4 of the case part 3. As shown in FIG. 6, which is a top cross-sectional view of the recessed position, the recessed shape of the door 27 is formed by first recessing a first step for inserting the case part 3 of the latch case 1 and a second step for fitting the front surface 2 and the front plate 1, which will become the flange part, from the door end surface of the door 27. Furthermore, from the front and back sides of the door 27, holes are drilled as holes 14 for fitting the decorative cover in the portions facing the operation windows 4 when the latch case 1 is inserted. Therefore, as shown in FIG. 6, the decorative cover fitting holes 14 on the front and back sides of the door 27 are set to be shifted by a predetermined distance in the lateral direction.

[0027] After the slide latch lock is inserted into the recessed portion from the door end surface of the door 27, the front panel 7 is placed over it and fixed with screws or the like, and the decorative cover 16 having the operation hole 15 is placed over the decorative cover fitting hole 14, which is the state shown in Fig. 1. There are no restrictions on the shape, size, or installation method of the decorative cover 16, but since it is better not to expose the inner surface of the decorative cover fitting hole 14 of the door 27, it is better to provide a rectangular depth portion close to the inside of the decorative cover fitting hole 14, and form the open central portion of the inner side as the operation hole 15. Although not shown, it is assumed that the decorative cover 16 can be simply attached by fitting the tip of the aforementioned depth surface into the operation window 4 of the case part 3 and holding it with a claw shape or the like.

[0028] Next, Fig. 7 shows the state in which the slide latch lock attached to the door 27 is actually operated, with Fig. 7(a) showing the locked state before operation and Fig. 7(b) showing the unlocked state. In the state of Fig. 7(a), the operation window 4 of the latch case 1 and the operation recess 11 of the slide latch 8 are arranged in an overlapping and exposed state through the operation hole 15 of the decorative cover 16, and when a finger or the like is inserted into the operation recess 11 of the slide latch 8 from the operation hole 15, the operation naturally pushes the inclined guide surface 12 and leads to the operation of moving the slide latch 8 toward the hanging side, and the latch head 9 sinks as shown in Fig. 7(b), making it possible to unlock. In the state of Fig. 7(b), the operation recess 11 has already moved inside the case part 3, and the operation of pulling the door 27 by hooking the finger hook part 5 is possible, and the door 27 can be opened and closed by a series of operations of pulling the finger hook part 5 toward yourself and pushing the back surface of the operation recess 11. Furthermore, when the door 27 is opened or closed from the unlocked state shown in FIG. 7(b) and then a finger or the like is removed, the force of the spring member 13 causes the door to return to the state shown in FIG. 7(a).

[0029] FIG. 8 is a perspective view of the slide latch lock with the above configuration, showing the front and back views, with FIG. 8(a) showing the front view and FIG. 8(b) showing the back view. As shown in FIG. 8, the positions of the two decorative covers 16 from the door end surface are different in the above configuration, so the problem of losing uniformity in design remains. In addition, as shown in FIG. 6, the process involves processing the decorative cover fitting holes 14 from both door surfaces, so the different positions of the decorative cover fitting holes 14 require special attention in processing, and it is assumed that it is not good in terms of the door 27 being compatible with both left and right doors. However, as shown in FIG. 6, when installing a normal slide latch lock, it is necessary to leave a certain thickness on both surfaces for a general wooden interior door, and as a result, there is a limit to the thickness of the slide latch lock itself. In addition, since the operation method is a means of inserting a finger or the like into the operation recess 11 and moving it left and right, a certain dimension or more of depth of the operation recess 11 is a necessary condition, and a configuration in which both operation recesses 11 are shifted horizontally by a certain dimension is effective.

[0030] Specifically, the thickness of the door 27 normally used indoors is often 36 mm or 33 mm, and if at least 5 mm is left on both sides of the outer wooden parts of the door 27 to prevent cracking, a thickness portion for forming the finger hook portion 5 of the latch case 1 is also required, so the thickness of the slide latch 8 needs to be about 23 mm to 20 mm or less. In addition, the thickness of the fingertip is about 12 to 15 mm, and when the door 27 is pulled toward the front to open it, the finger hook portion 5 is pulled with the finger slightly bent, and as a result, it is assumed that the depth of the operation recess 11 of the slide latch 8 needs to be about 18 mm or more. Therefore, it is effective to provide the operation recess 11 at a position a predetermined distance away from the door end surface toward the hanging side on the front side, and provide the operation recess 11 at a position further away from the hanging side on the back side, so that the two are arranged so as not to overlap while shifting horizontally. In addition, in the method of setting two operation recesses 11 on the front and back sides by shifting them laterally, the door stop of the vertical frame 26 overlaps near the door edge when the door 27 is closed as shown in Fig. 1, so it is better to set the operation recess 11 on the front side closer to the door edge. However, the above-mentioned problems remain, so a method is described below in which the operation recesses 11 are shifted laterally, while still minimizing the sense of incongruity in the design of the decorative cover 16 on both sides of the door 27 and facilitating the recessing process.

[0031] First, as a method of simply solving the design problem of the decorative cover 16, it is advisable to extend the decorative cover 16 on the front side in the door tail direction and the decorative cover 16 on the back side in the door tip direction to make the external shapes of both decorative covers 16 the same, as shown in Fig. 9. Fig. 10 is a perspective view of the front and back of the door 27 in the state of Fig. 9, and since the distance from the door tip to the end of the decorative cover 16 is visually the same, it is assumed that the difference between the two door surfaces will be significantly reduced. If the decorative cover 16 is to be made wider as described above, it is possible to implement it with the same shape of the decorative cover fitting holes 14 on both sides of the door being enlarged in the horizontal direction as shown in Fig. 11, and it becomes possible to configure the decorative cover 16 to be fitted without rattling, so that the appearance is the same as that of Fig. 10, and at the same time, it is possible to solve another problem, that the positions of the decorative cover fitting holes 14 on both sides of the door are different. In this way, the only difference between the two door surfaces will be the position of the operation hole 15 on the decorative cover 16 as shown in Figure 10, and if it is desired to make the design of the decorative cover 16 on both door surfaces similar, it is also possible to make the side of the operation hole 15 a wide recessed shape as shown in Figure 12. However, with this shape, it is possible that a finger or the like will pull the edge of the wide recess on the side of the operation hole 15 with a finger or the like instead of inserting a finger or the like into the operation recess 11 of the slide latch 8. Therefore, rather than providing a wide recess on the side of the operation hole 15, it is better to provide an inclined surface on the side of the operation hole 15 as shown in Figure 13 so that a finger or the like will not get caught in it.

[0032] In the above, in order to ensure sufficient depth for the operation recesses 11 of the slide latch 8, the configuration has been described in which the operation recesses 11 on both door surfaces are shifted horizontally so as not to overlap each other. As another means, it is possible to set the operation recesses 11 on the back side above the latch head 9 of the slide latch 8 and the operation recesses 11 on the front side below it, and shift them vertically so that the operation recesses 11 do not overlap each other. In this configuration, the operation recesses 11 on the front side and the operation recesses 11 on the back side can be either on top or bottom, and there is no limitation to left and right, which is advantageous. Figure 14 is a perspective view of the above configuration, and Figure 15 is a plan view seen from the door end surface. This configuration in which the operation recesses 11 are shifted vertically is good in that the size of the slide latch lock itself in the depth direction can be reduced, but it is assumed that the weakness is that the size in the vertical direction becomes large.

[0033] As mentioned above, in the above configuration, it is assumed that the method of shifting the operation recesses 11 on the front side and the back side is superior for the door 27 with a thickness of 36 mm or 33 mm, which is the most frequently used, but it is not essential for the door 27 with an extremely large thickness. Or, if the door end portion of the door 27 is made of a hollow aluminum extrusion material, the thickness of the latch case 1 can be increased to the maximum inner dimension of the material, and as a result, it is assumed that it is possible to make the positions of the operation recesses 11 on the front side and the back side the same without having to shift them alternately. Here, Figure 16 shows the configuration for a door 27 with a fairly large thickness, in which the operation recesses 11 are located at a position a predetermined distance away from the door end surface toward the hanging side, and the positions and shapes of the operation recesses 11 on both the front side and the back side are set symmetrically with respect to the center line of the thickness of the door 27, and further, the surface portion separating the two operation recesses 11 is formed thin, making it possible to ensure the depth when inserting a finger, etc. In this case, the operation window 4 of the latch case 1 and the decorative cover fitting hole 14 provided in the door 27 can be disposed in the same position on both the front and back sides of the door 27.

[0034] However, there may be cases where it is absolutely necessary to set the operation recesses 11 at the same position on the front and back sides of a door 27 of a normal thickness. In that case, a slide latch 8 having an operation through hole 17 as shown in FIG. 17 that breaks through the inner surfaces of both operation recesses 11 can be provided, and an inclined guide surface 12 can be provided on both sides of the hanging side of the operation through hole 17. In this case, the operation window 4 of the latch case 1 and the decorative cover fitting hole 14 provided in the door 27 are also located at the same position on both the front and back sides of the door 27. However, when the operation through hole 17 as described above is used, if the hole is left open, the other side of the door 27 can be seen when looking inside, which is not good. Therefore, it is better to attach a flap member 18 as shown in FIG. 17 to the decorative cover 16 on both sides of the door via a torsion spring 19 so that it can rotate freely and always return to a position parallel to the door surface.

[0035] Fig. 17(a) shows the locked state with the latch head 9 protruding, and when the flap member 18 is inserted into the operation through hole 17 while being pressed with a fingertip, the fingertip hits the inclined guide surface 12, and when it is further pressed, the slide latch 8 is moved and the fingertip can be inserted deeper as shown in Fig. 17(b), and the fingertip can be pulled. However, when the slide latch 8 is moved laterally to unlock and then pushed to open the door 27, the relatively narrow fingertip 5 on the opposite side is pressed, and it is assumed that the operability is inferior to the configuration in which the operation recess 11 is shifted laterally. In addition, the configuration in Fig. 17 requires the flap member 18 and the torsion spring 19 separately, and is assumed to be expensive in terms of cost, but in terms of design, the operation hole 15 of the decorative cover 16 can be blocked by the flap member 18 to be flush with the decorative cover 16, and it can be said that the design is different from the configuration in which the operation recess 11 is visible as a deep recess.

[0036] In addition, in Figs. 1 to 7, the latch head 9 is formed integrally with the slide portion 10, but this configuration is assumed to be possible when the weight of the slide latch 8 itself including the latch head 9 is small and the protruding and retracting operation is easy even with a weak spring member 13. As shown in Figs. 9 to 13, the slide latch 8 can be divided into the latch head 9 and the slide portion 10, and the latch head 9 alone can be rotated with only the front plate 7 of the slide latch lock removed even after the slide latch 8 is attached to the door 27, which is suitable for changing the left-right direction. Furthermore, as shown in Figs. 16 and 17, the slide latch 8 can be divided into the latch head 9 and the slide portion 10, and the latch head 9 can be attached so that it can protrude and retract within the slide portion 10 via the latch head spring member 20. This configuration, as shown in Figs. 14 and 16, can be used in cases where the weight of the slide portion 10 of the slide latch 8 tends to be large, and by obtaining a configuration in which only the latch head 9 protrudes and retracts, the latch head 9 can be set to retract with a lighter force. Therefore, any configuration of the latch head 9 can be used. [Brief description of the drawings]

[0037] [Figure 1] 1 is a top cross-sectional view of the slide latch lock of the present invention attached to a door. FIG. [Diagram 2] FIG. 2 is a perspective view of a latch case of the slide latch lock of the present invention. [Diagram 3] FIG. 2 is a top view of the slide latch of the slide latch lock of the present invention. [Figure 4] FIG. 2 is a front view of the slide latch of the slide latch lock of the present invention. [Diagram 5] FIG. 2 is a top cross-sectional view of the slide latch lock of the present invention in a locked state. [Figure 6] 1 is a top cross-sectional view of a recessed portion of a door to which the slide latch lock of the present invention is attached. [Figure 7] 1 is a top cross-sectional view showing a locked state and an unlocked state of the slide latch lock of the present invention. [Figure 8]1 is a perspective view of the slide latch lock and decorative cover of the present invention attached to a door. FIG. [Figure 9] This is a top cross-sectional view of the slide latch lock of the present invention, with decorative covers of the same outer shape attached to both sides of the door. [Figure 10] This is an oblique view of the slide latch lock of the present invention, with decorative covers of the same outer shape attached to both sides of the door. [Figure 11] This is a top cross-sectional view of the slide latch lock of the present invention with a decorative cover attached to the decorative cover fitting holes of the same shape provided on both sides of the door. [Figure 12] This is a top cross-sectional view of the slide latch lock of the present invention, in which a decorative cover having a wide recess on the side of the operation hole is attached to the decorative cover fitting holes of the same shape provided on both sides of the door. [Figure 13] This is a top cross-sectional view of the slide latch lock of the present invention, in which a decorative cover having an inclined surface on the side of the operation hole is attached to the decorative cover fitting holes of the same shape provided on both sides of the door. [Figure 14] 1 is a perspective view of a slide latch lock of the present invention in which the operating recesses on both sides of the door are shifted in the vertical direction. [Figure 15] This is a plan view of the slide latch lock of the present invention, seen from the door end side, in which the operating recesses on both sides of the door are shifted in the vertical direction. [Figure 16] This is a top cross-sectional view of the slide latch lock of the present invention when the door is thick. [Figure 17] 1 is a top cross-sectional view showing the locked and unlocked states of a slide latch lock of the present invention in which an operating through hole is provided instead of an operating recess and a flap member is added to the decorative cover. [Figure 18] FIG. 1 is an exploded perspective view of a conventional latch lock and its operating members, a base and a handle. [Explanation of symbols]

[0038] 1 Latch Case 2 Front side 3 Case part 4 Operation window 5 Finger hook part 6 Latch head recess hole 7 Front plate 8 Slide latch 9 Latch Head 10 Slide section 11 Operation recess 12 Inclined guideway 13 Spring material 14 Hole for fitting decorative cover 15 Operation hole 16 Makeup Cover 17 Operation through hole 18 Flap member 19 Torsion spring 20 Spring member for latch head 21 Pedestal 22 Handle 23. Hub 24 square shaft 25 square hole 26 Vertical Frame 27 Door

Claims

1. A latch lock that is installed on the front side of a door that is opened and closed by pushing and pulling the door, and has a latch case with a front surface and a case portion, a slide latch, and a decorative cover, the case portion of the latch case has an operation window with a finger hook, and the slide latch consists of a latch head that protrudes and retracts from the door front surface and a slide portion having an operation recess, the slide latch is assembled inside the latch case together with a spring member, and at this point the operation window in the case portion and the operation recess in the slide portion overlap face-to-face to form the slide latch lock, and after the slide latch lock is recessed into the door and positioned, decorative covers are attached to both sides of the door, and from this state, the latch head is recessed and the door is unlocked by inserting a finger or the like into the operation recess to move the slide latch toward the door end, and the door can be opened or closed by opening it towards you or pushing it in.

2. 2. The sliding latch lock for a door as described in claim 1, characterized in that a finger hook portion is formed on the inner surface of the vertical end of the operating window of the latch case, the operating recess of the slide latch is vertically long and has a cross section that is approximately trapezoidal, the inner surface of the operating recess on the hanging side is provided as an inclined guide surface, holes for fitting a decorative cover are provided on both sides of the door, and a decorative cover having an operating hole is attached to the holes for fitting the decorative cover, and when the latch head is in the locked state with the latch head protruding, the inclined guide surface is set to be completely exposed through the operating hole and the operating window, and when a finger or the like is inserted into the operating recess, the inclined guide surface is naturally pushed against the sliding latch toward the hanging side, and at that stage the inclined guide surface has already moved beyond the finger hook portion, making it possible to perform an operation of pulling the door open by hooking the finger hook portion on it, or an operation of pushing the rear surface of the operating recess to open the door.

3. The sliding latch lock for doors as described in claim 1 or 2, characterized in that the operating recesses of the sliding latch are provided in two locations so that they can be operated from both sides of the door, with the side that is opened by pulling the door being the front side and the side that is opened by pushing the door being the back side, an operating recess from the front side is provided at a position a predetermined distance away from the door end surface toward the hanging side, and an operating recess from the back side is provided at a position a predetermined distance away from the door end surface toward the hanging side, and the two are arranged offset horizontally so that they do not overlap.

4. The operating recesses of the slide latch are provided in two locations so that they can be operated from both sides of the door, with the side that is opened by pulling the door being the front side and the side that is opened by pushing the door being the back side, characterized in that the operating recess from the front side is provided at a position a predetermined distance away from the door end surface toward the hinged side, and the operating recess from the back side is provided at a position shifted a predetermined distance in the vertical direction from that, and the two are positioned offset in the vertical direction so that they do not overlap.

5. A sliding latch lock for a door as described in claim 3, characterized in that the holes for fitting the decorative cover on both sides of the door are set to be the same size and in the same position, the decorative cover on the front side is extended toward the door tip and the decorative cover on the back side is extended toward the door tail, and the outer shapes and positions of both decorative covers relative to the door surface are made the same, thereby eliminating left and right handedness when drilling into the door and making it possible to make the designs of the decorative covers on both door surfaces similar.

6. A slide latch lock for doors as described in claim 1 or 2, characterized in that the thickness of the slide latch lock is set to the maximum thickness that can be recessed into the door thickness, the operation recess is located a predetermined distance away from the door end surface toward the hinge side, the positions and shapes of the operation recesses on both the front and back sides are arranged symmetrically about the center line of the door thickness, and further the surface portion separating the two operation recesses is made thin to ensure that fingers or the like can be inserted into the operation recesses on both sides of the door and that the unlocking operation can be performed.

7. A slide latch lock for a door as described in claim 1 or 2, characterized in that the operating recess of the slide latch is formed by an approximately rectangular operating through hole, an inclined guide surface is provided on the inner surface of the hanging side of the operating through hole, the operating window of the latch case and the hole for fitting the decorative cover provided in the door are arranged at the same position on both the front and back sides of the door, and a flap member is attached to the decorative cover via a torsion spring so that it can rotate freely and always return to a position parallel to the door surface, the flap member is pushed in while the inclined guide surface is pushed to move the slide latch to unlock it, and the door can be opened and closed by pushing and pulling it in that state.

8. A slide latch lock for doors as described in claim 1 or 2, characterized in that the latch head and slide portion of the slide latch are separated, and the left and right direction of the slide latch lock can be changed by rotating the latch head with the front plate of the slide latch lock removed, and the latch head is attached so that only the latch head can be raised and lowered within the slide portion via a spring member for the latch head, and in the final stage when the door is closed, only the latch head retracts and engages with the latch receiver.

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