JP5879148B2 - Opening-reducing tablet - Google Patents

Description

  The present invention relates to an opening force reducing lock that is provided on an airtight door such as a condominium entrance and assists the opening of the door against a pressure difference generated inside and outside the room.

  In general, in buildings such as condominiums and highly airtight houses, when a ventilating fan is operated in a sealed state, the indoor atmospheric pressure becomes lower than the outside, and a large force is required to open the entrance door. For small children and the elderly, it is difficult to open the door.

  Thus, conventionally, in order to enable smooth opening of the door, there has been proposed an opening force reducing lock that assists the opening of the door against a pressure difference generated inside and outside the room.

  For example, in the opening assist lock disclosed in Patent Document 1, a pry opening latch provided on the door side abuts on a corner portion of a reaction member provided on the door frame side by rotating the operation shaft, thereby opening the door. A reaction force that squeezes in the direction is generated, and this reaction force serves as an assisting force in the door opening direction, enabling a smooth opening of the door.

  In addition, the door structure disclosed in Patent Document 2 is such that a protruding hook protruding from the door's top is provided at the contact portion provided on the door frame in conjunction with the swing of the lever provided near the handle of the door. By abutting, the door is swung in the opening direction, the pressure difference between the inside and outside the room is eliminated, and the door can be opened smoothly.

JP 2005-127044 A JP 2004-285656 A

  However, since the reaction force member in the opening assisting lock of Patent Document 1 and the contact portion in the door structure of Patent Document 2 are provided so as to protrude from the door frame, the door frame is caused by the occurrence of an earthquake or the like. In the case of deformation, there is a problem that the reaction member or the abutting portion interferes with the door, the door cannot be opened, and there is a high possibility that the emergency evacuation will be hindered.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an opening force assisting lock capable of opening a door even when the door frame is deformed due to an earthquake or the like. is there.

  In order to achieve the above-described object, the present invention provides a latch member so that the latch member can advance and retract from the door, a strike plate having a latch receiving hole in which the latch member can advance and retract, and the latch member includes An opening force reducing lock that assists the opening of the door from a state in which the door can be retracted or reversed from the latch receiving hole, and a notch formed in the strike plate, and a contact member disposed in the notch A biasing member that biases and supports the corresponding contact member in a direction protruding from the strike plate, and is capable of moving forward and backward from the door, and contacts the contact member when protruding from the door, And a pressing body for assisting in the opening direction.

  And in the opening force reducing lock according to the present invention, the lock is provided on the back side of the strike plate so as to cover the contact member, and the urging member is provided between the contact member and the trowel. The spring is interposed.

  Further, in the opening force reducing lock according to the present invention, the biasing member is configured by polymerizing a plurality of leaf springs, and a central portion of each leaf spring is curved convexly on the surface side, The upper and lower ends of the spring are formed so as to be slidable along the bottom surface of the troyoke.

  Further, in the opening force reducing lock according to the present invention, the contact member disposed on the back side of the contact member, and the contact member so that the protruding length of the contact member from the strike plate can be adjusted. And an adjusting member interposed between the receiving member and the receiving member.

  In the opening force reducing lock according to the present invention, a receiving member to which the abutting member is fixed is provided on the back side of the strike plate, and the receiving member functions as the biasing member. It is characterized by.

  Furthermore, in the opening force reducing lock according to the present invention in which the receiving member functions as the urging member, the receiving member is formed with a recess toward the back side, and at both ends of the bottom surface of the recess The elastic part is formed so as to protrude to the back side, and the elastic part is formed to be elastically deformable so that the protruding length to the back side becomes small as the contact member is pressed. Features.

  Furthermore, in the opening force reducing lock according to the present invention in which the receiving member functions as the urging member, a protruding length of the contact member from the strike plate is provided between the concave portion of the receiving member and the contact member. An adjustment member is interposed so as to be adjustable.

  According to the present invention, even when the door frame is deformed due to the occurrence of an earthquake or the like, the door can be opened, and various excellent effects can be obtained, such as being able to evacuate smoothly and reliably in an emergency. it can.

It is a front view which shows the member by the side of the door frame of the opening force reduction lock | rock which concerns on the 1st Embodiment of this invention. It is a front view which shows the state which removed the strike board in the member by the side of the door frame of the opening force reduction lock | rock which concerns on the 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a sectional side view which shows the member by the side of the door of the opening force reduction lock | rock which concerns on the 1st and 2nd embodiment of this invention. It is a plane sectional view which shows the member by the side of the door of the opening force reduction lock | rock which concerns on the 1st and 2nd embodiment of this invention. It is sectional drawing which shows the state by which the contact member was pressed to the surface of the strike plate in the opening force reduction lock | rock which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the state which the contact member and the strike plate were pressed in the opening force reduction lock | rock which concerns on the 1st Embodiment of this invention, and the biasing member and the strike plate were elastically deformed. It is sectional drawing which shows the member by the side of the door frame of the opening force reduction lock | rock which concerns on the 2nd Embodiment of this invention. It is a front view which shows the receiving member of the opening force reduction lock | rock which concerns on the 2nd Embodiment of this invention. It is a side view which shows the receiving member of the opening force reduction lock | rock which concerns on the 2nd Embodiment of this invention. It is CC sectional drawing of FIG. It is sectional drawing which shows the state which the contact member and the strike board were pressed in the opening force reduction lock | rock which concerns on the 2nd Embodiment of this invention, and the receiving member and the strike board were elastically deformed.

  Hereinafter, the schematic configuration of the opening force reducing lock according to the first embodiment of the present invention will be described with reference to the drawings.

  The opening force reducing lock 1 according to the first embodiment of the present invention includes a door frame side member 3 attached to the vertical frame of the door frame 2 and a door side member 5 attached to the door 4. It is configured. In this case, the door 4 is attached to the door frame 2 so as to open to the outdoor side, and a door stop (not shown) is formed in the vertical frame of the door frame 2 on the side opposite to the opening direction of the door 4. A packing (not shown) that seals the gap between the door 4 and the door 4 when the door 4 is closed is attached to the door stop, and when the indoor side becomes negative pressure, the inner portion of the door 4 passes the door through the packing. Can be pressed against.

  First, the member 3 on the door frame side of the opening force reducing lock according to the first embodiment of the present invention will be described in detail with reference to FIGS. Here, FIG. 1 is a front view showing a member on the door frame side of the opening force reducing lock according to the first embodiment of the present invention, and FIG. 2 is an opening force reducing lock according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line BB in FIG. 1.

  The door frame side member 3 according to the present embodiment includes a strike plate 6 provided at the top of the vertical frame of the door frame 2, a movable plate 8 provided on the back side of the strike plate 6, and a back side of the movable plate 8. And a trolley 10 provided on the back side of the strike plate 6 so as to cover the movable plate 8 and the receiving member 9.

  The strike plate 6 has a vertically long rectangular shape when viewed from the front, the left side portion is folded at a right angle, and the upper and lower end portions 6a and 6b are bent to the back side so as to be inclined. The strike plate 6 is formed with fixing round holes 11 on the upper and lower sides, and a substantially rectangular latch receiving hole 12 and a notch 13 are formed between the upper and lower round holes 11 in order from the upper side. The notch 13 is formed so as to cut out the edge of the door 4 on the opening direction side (left side in FIG. 1).

  The movable plate 8 has a vertically long rectangular shape when viewed from the front, and the left and right side portions 14L and 14R are folded at right angles. The upper and lower ends of the movable plate 8 are formed with tap holes 15 in which female screws are respectively screwed at positions corresponding to the round holes 11 of the strike plate 6. The strike plate 6 and the movable plate 8 are integrated by inserting the screw 16 into the round hole 11 and screwing it into the tap hole 15.

  An upper rectangular hole 17 and a lower rectangular hole 18 are formed between the upper and lower tap holes 15 of the movable plate 8 at positions corresponding to the latch receiving holes 12 and the notch portions 13 of the strike plate 6. Long holes 21L and 21R that are long in the depth direction (perpendicular to the plane of FIG. 1) are formed at the upper and lower ends of the left and right side portions 14L and 14R of the movable plate 8, respectively. It arrange | positions in the position which does not interfere with the tap hole 15 visually.

  The receiving member 9 includes a concave portion 22 formed by bending a flat plate in a crank shape, and a guide portion 23 projecting up and down along the inner surfaces of the left and right side portions 14L and 14R of the movable plate 8. The recess 22 is provided so as to cover the notch 13 from the back side. The bottom surface 24 of the recess 22 is provided with two tapped holes 25 in which female screws are threaded on the left and right sides, and a counterbore hole 26 is formed at the center on the right side.

  The troyoke 10 is formed in a box shape 28 that is formed by bending the strike receiving plate 12 of the strike plate 6 and a part of the cutout portion 13 in a concave shape so as to cover from the back side, and is formed in a bowl shape around the box portion 28. And a flange portion 29. Shaft holes (not shown) are formed on the left and right side surfaces of the box portion 28 at the upper and lower opposing positions, respectively, and by caulking the end portions of the shaft portions 30 inserted through the shaft holes and the long holes 21L and 21R. The movable plate 8 is fixed to the trolley 10. At this time, since the long holes 21L and 21R are formed in the movable plate 8, the attachment position of the movable plate 8 with respect to the troyoke 10 is finely adjusted along the forming direction (that is, the depth direction) of the long holes 21L and 21R. It is possible. Further, round holes 31 are formed in the upper and lower end portions of the flange portion 29 of the troyoke 10, and the troyoke 10 is opened by inserting the countersunk screws 32 into the respective round holes 31 and screwing them into the door frame 2. The frame 2 is fixed.

  A contact member 33 is disposed in the cutout portion 13 of the strike plate 6, and the contact member 33 is provided with a main body portion 34 provided along the right side portion 14 </ b> R of the movable plate 8, and the concave portion 22 from the main body portion 34. The bottom portion 35 extends along the bottom surface 24, and the top portion 36 extends outward from the main body portion 34 on the opposite side of the bottom portion 35. The main body portion 34 has two upper and lower screw holes 37 threaded in the horizontal direction, and the bottom portion 35 has two upper and lower screw holes 38 at positions corresponding to the tap holes 25 of the receiving member 9. Is formed. Further, an L-shaped recess 39 is formed from the inner surface side of the main body portion 34 to the surface side of the top portion 36, and an L-shaped receiving plate 40 can be fitted into the recess 39. A screw hole 41 is formed in the receiving plate 40 at a position corresponding to the screw hole 37 of the main body 34, and a countersunk screw 42 is screwed into the screw hole 37 of the main body 34 from the screw hole 41. Thus, the main body 34 and the receiving plate 40 are integrated.

  Between the contact member 33 and the bottom surface 24 of the concave portion 22 of the receiving member 9, a plurality of (two in the drawing) superposed liner plates 44 are interposed as adjusting members. Each liner plate 44 is formed with a through hole 45 at a position corresponding to the screw hole 38 of the bottom portion 35 of the contact member 33 and the tap hole 25 of the receiving member 9. As a result, by inserting the countersunk screw 46 from the screw hole 38 through the through hole 45 and screwing it into the tap hole 25, the contact member 33 and the receiving member 9 are integrated, and the number of overlapped liner plates 44 is increased. By changing the above, the protruding length of the contact member 33 from the strike plate 6 can be adjusted to a desired length.

  An urging member 80 is interposed between the receiving member 9 and the trowel 10, and the urging member 80 is configured by superposing two elongated leaf springs 81 in the vertical direction. The urging member 80 may be configured by superimposing one plate spring or three or more plate springs. However, by setting a plurality of plate springs, the setting of the urging force of the spring can be performed. It will be easier to do.

  A central portion 82 of each leaf spring 81 is convexly curved on the front surface side, and a mounting hole 83 is formed at the center of the leaf spring 81 at a position corresponding to the counterbore hole 26 of the receiving member 9. The urging member 80 is fixed to the receiving member 9 by screwing the screw 84 into the counterbore hole 26 through 83. Further, the upper and lower end portions 85 of each leaf spring 81 are bent so as to be folded back to the surface side, and are formed so as to be able to come into line contact with and slide on the bottom surface of the box portion 28 of the troyoke 10. By providing the urging member 80 in this way, the abutting member 33 is urged and supported in a direction protruding from the strike plate 6.

  Next, the door-side member 5 will be described in detail with reference to FIGS. 5 and 6. 5 is a side sectional view showing the door-side member 5, and FIG. 6 is a plan sectional view showing the door-side member 5. As shown in FIG.

  The door-side member 5 includes a latch-locked lock box 50, and a lever handle (not shown) is provided as an outer operation member 48 and an inner operation member 49 on the outdoor and indoor surfaces of the door 4. It has been. Here, the “latch lock” is a lock having a latch member called a latch bolt or a reverse latch, and excludes a lock lock having only a dead bolt. Accordingly, locks having only a latch bolt, a latch bolt or a reversing latch and having a dead bolt (for example, a front door lock) are included in the latch lock here.

  In the lock box 50 of the latch lock, the drive cam 52 that rotates by the operation force of the outer operation member 48 or the inner operation member 49 and the rear end portion thereof engage with the drive arm 53 of the drive cam 52 and the drive arm 53. The sliding control body 55 slides against the urging force of the urging means 86 by the driving force, and the inner end portion of the sliding control body 55 is connected to the distal end portion of the sliding control body 55 via the connecting means 56. A swing-type pressing body 58 that is pivotally supported through a vertical shaft 57 at a central portion corresponding to a corner portion on one side wall of the door of the lock box 50 is incorporated. The portion 59 always protrudes from the front plate 60 of the lock box 50 provided at the mouth of the door 4.

  The drive cam 52 includes a cylindrical portion 62 through which the angular shaft 61 that connects the shaft portions of the outer operation member 48 and the inner operation member 49 passes, and a long drive arm 53 that extends downward from the cylindrical portion 62 in an oblique radial direction. The drive arm 53 is provided with a short drive arm 54 extending in a substantially opposite direction.

  Further, the latch box 50 of the latch lock is provided with a latch bolt 63 as a latch member so as to be able to advance and retract from the front plate 60. The latch bolt 63 includes an engagement tip portion 64, a rod-shaped latch rod 65 integrally provided on the rear end surface of the engagement tip portion 64, and an engagement of a predetermined length provided continuously to the rear end portion of the latch rod 65. The rear end portion 66 includes a latch spring 68 interposed between the engagement rear end portion 66 and the rear wall 67 of the lock box 50.

  Next, the operation of the opening force reducing lock 1 according to the first embodiment of the present invention will be described.

  As shown in FIG. 5, in a state where the latch bolt 63 protrudes from the front plate 60 by the operating force of the outer operating member 48, the outer operating member 48 is pushed down, and the drive cam 52 is rotated in the clockwise direction in FIG. Then, since the short drive arm 54 of the drive cam 52 presses the engaging portion 69 at the rear end of the latch bolt 63, the latch bolt 63 moves backward toward the rear wall 67 of the lock box 50.

  Next, when the driving cam 52 is further rotated clockwise by the operating force of the outer operating member 48, the long driving arm 53 of the driving cam 52 contacts the rear end surface of the sliding control body 55, which is well shown in FIG. As shown, the swing-type pressing body 58 is pushed by the distal end portion of the sliding control body 55 at a position where the rear end portion is slightly eccentric to the outside of the center line. As a result, the pressing body 58 rotates horizontally with the upper and lower vertical shafts 57 serving as fulcrums, and the front end portion 59 of the pressing body 58 passes through the notch portion 13 and the corner portion 51 (see FIG. 4) on the principle of leverage. Thus, when the front-end | tip part 59 of the press body 58 contact | abuts to the corner | angular part 51 of the receiving plate 40, reaction force generate | occur | produces, this reaction force acts in the direction which opens the door 4, and the door 4 and door frame A gap is formed between the two and indoor and outdoor ventilation. As a result, the pressure difference between the inside and outside of the room is eliminated, and the door 4 can be easily opened.

  When the door frame 2 is deformed due to an earthquake or the like and the contact member 33 interferes with the door 4, the contact member 33 receives the urging force of the urging member 80 as shown in FIG. 7. It is pressed against. As a result, the upper and lower end portions 85 of each leaf spring 81 slide up and down along the bottom surface of the box portion 28 of the trolley 10, and the contact member 33 is flush with the surface of the strike plate 6. It can slide inward along each inner surface of the left and right side portions 14L, 14R.

  Further, when the door frame 2 is further deformed and the contact member 33 and the strike plate 6 interfere with the door 4, the contact member 33 receives the urging force of the urging member 80 as shown in FIG. 8. Again, it is pressed together with the strike plate 6. As a result, the upper and lower end portions 85 of each leaf spring 81 slide up and down along the bottom surface of the box portion 28 of the troyoke 10 until each leaf spring 81 becomes substantially flat along the bottom surface of the box portion 28 of the trolley 10. The strike plate 6 can move to the door frame 2 side together with the abutting member 33 until the upper and lower end portions 6a and 6b become flat along the flange portion 29 of the trolley 10.

  Thus, even when the door frame 2 is deformed due to the occurrence of an earthquake or the like, the contact member 33 does not protrude from the strike plate 6, and the strike plate 6 moves to the door frame 2 side together with the contact member 33, Since the contact member 33 and the strike plate 6 can be prevented from interfering with the door 4, the door 4 can be opened, and emergency evacuation can be performed smoothly and reliably.

  In the first embodiment described above, the urging member 80 is constituted by the plate spring 81, but the abutting member 33 such as a spring or rubber other than the plate spring is applied in a direction protruding from the strike plate 6. As long as it is a member that can be supported by force, it may be formed of other members.

  Hereinafter, the opening force reducing lock according to the second embodiment of the present invention will be described with reference to FIGS. Here, FIG. 9 is a sectional view showing a member on the door frame side of the opening force reducing lock according to the second embodiment of the present invention, and FIG. 10 is an opening force reducing lock according to the second embodiment of the present invention. FIG. 11 is a side view showing the receiving member of the opening force reducing lock according to the second embodiment of the present invention, FIG. 12 is a sectional view taken along the line CC in FIG. 10, and FIG. It is sectional drawing which shows the state to which the contact member and the strike plate were pressed and the receiving member and the strike plate were elastically deformed in the opening force reduction lock | rock which concerns on the 2nd Embodiment of invention. In the following description, for simplification of description, the same configuration as the door frame side member and the door side member of the opening force reducing lock according to the first embodiment described above is the same in the drawings. The detailed description is abbreviate | omitted.

  In the member 100 on the door frame side of the opening force reducing lock according to the present embodiment, a receiving member 101 for fixing the contact member 33 is provided on the back side of the strike plate 6 and the movable plate 8, and this receiving member 101 is described above. The biasing member 80 (leaf spring 81) in the first embodiment is configured to function.

  10 to 12, the receiving member 101 includes flange portions 102a and 102b formed at upper and lower end portions of a strip-shaped plate member, and inward from the flange portions 102a and 102b. The upper and lower side surfaces 103a and 103b are formed by being bent substantially at a right angle, and the bottom surface 105 is formed so as to be provided with the recess 104 between the upper and lower side surfaces 103a and 103b.

  The upper and lower flanges 102a and 102b are respectively provided with flat cylindrical hooking portions 106a and 106b projecting at the center and projecting curved surface projecting portions 107a and 107b on the left and right sides thereof. The outer diameter of the upper hooking portion 106a is smaller than the outer diameter of the lower hooking portion 106b. The receiving member 101 is aligned by the protrusions 107 a and 107 b, and the upper and lower latching portions 106 a and 106 b are fixed to predetermined positions of the movable plate 8 by fitting into the holes at the correct positions of the movable plate 8. The

  The bottom surface 105 includes a crossover portion 108 formed between inner end portions of the upper and lower side surfaces 103a and 103b, a cantilever portion 109 formed to extend from the crossover portion 108 to the left side in a cantilevered manner, It is configured with. Elastic portions 110a and 110b are formed at the upper and lower end corners of the extending portion 108 of the bottom surface 105 so as to protrude to the back surface side. The cantilever 109 has two tap holes 111 in which female screws are threaded in parallel.

  As shown in FIGS. 9 and 13, a plurality of (two in the drawing) polymerizable liner plates 44 are interposed as adjustment members between the bottom surface 105 of the receiving member 101 and the contact member 33. It is disguised. Each liner plate 44 is formed with a through hole 45 at a position corresponding to the screw hole 38 of the bottom 35 of the contact member 33 and the tap hole 111 of the receiving member 101. As a result, by inserting the countersunk screw 46 from the screw hole 38 through the through hole 45 and screwing it into the tap hole 111, the receiving member 101 and the contact member 33 are integrated, and the number of overlapped liner plates 44 is increased. By changing the above, the protruding length of the contact member 33 from the strike plate 6 can be adjusted to a desired length.

  In the opening force reducing lock according to the present embodiment having the above-described configuration, when the door frame 2 is deformed due to the occurrence of an earthquake or the like and the contact member 33 interferes with the door 4, the contact member 33 is pressed inward. Accordingly, the elastic portions 110a and 110b are elastically deformed so that the protruding length of the elastic portions 110a and 110b to the back surface side is reduced, and the inner portions of the upper and lower side surfaces 103a and 103b are elastically deformed so as to spread in the vertical direction. . Thereby, the contact member 33 slides inward until it becomes flush with the surface of the strike plate 6.

  Further, when the door frame 2 is further deformed and the contact member 33 and the strike plate 6 interfere with the door 4, the contact member 33 is further pressed together with the strike plate 6 as shown in FIG. 13. . As a result, the elastic portions 110a and 110b are elastically deformed until the back side is substantially flat, and the inner portions of the upper and lower side surfaces 103a and 103b are elastically deformed so as to further spread in the vertical direction. Further, the strike plate 6 moves to the door frame 2 side together with the contact member 33 until the upper and lower end portions 6a and 6b become flat along the flange portion 29 of the troyoke 10.

  Thus, even when the door frame 2 is deformed due to the occurrence of an earthquake or the like, the contact member 33 does not protrude from the strike plate 6, and the strike plate 6 moves to the door frame 2 side together with the contact member 33, Since the contact member 33 and the strike plate 6 can be prevented from interfering with the door 4, the door 4 can be opened, and emergency evacuation can be performed smoothly and reliably.

  In the first and second embodiments described above, the case where the swing-type pressing body 58 that rotates horizontally around the vertical shaft 57 at the time of contact is used as the pressing body that contacts the contact member. This is merely an example, and as the pressing body, for example, as disclosed in Japanese Patent Application Laid-Open No. 2004-285656 and Japanese Patent Application Laid-Open No. 2005-127044, the side surface of the tip portion has a slope. Various modifications are possible, such as using a known reciprocating-type pressing body that is formed in a substantially wedge shape and is provided so as to be able to advance and retreat from the mouth of the door 4.

1 Opening force reducing lock 2 Door frame 4 Door 6 Strike plate 9 Receiving member (receiving member)
10 Troyoke 12 Latch receiving hole 13 Notch 33 Contact member 44 Liner plate (adjustment member)
58 Pressing body 63 Latch bolt (latch member)
80 Energizing member 81 Leaf spring 82 Central portion 85 Upper and lower end portions 101 Receiving member 104 Recessed portion 105 Bottom surface 110a, 110b Elastic portion

Claims (7)

A latch member is provided so as to be able to advance and retract from the door, a strike plate having a latch receiving hole through which the latch member can advance and retract is provided in the door frame, and the latch member can be retracted or reversed from the latch receiving hole. An opening force reducing lock that assists in opening the door,
A notch formed in the strike plate;
A contact member disposed in the notch,
A biasing member that biases and supports the contact member in a direction protruding from the strike plate;
A pressing body provided so as to be capable of moving forward and backward from the door, and abutting on the contact member when protruding from the door and assisting the door in an opening direction;
An opening force reducing tablet characterized by comprising:   A trolley provided on the back side of the strike plate so as to cover the contact member is provided, and the urging member is a spring interposed between the contact member and the trolley. The opening force-reducing tablet according to claim 1.   The biasing member is configured by superposing a plurality of leaf springs, the central portion of each leaf spring is curved convexly on the surface side, and the upper and lower ends of each leaf spring are along the bottom surface of the troyoke 3. The opening force reducing tablet according to claim 2, wherein the opening force reducing tablet is slidable. A receiving member disposed on the back side of the contact member;
An adjusting member interposed between the abutting member and the receiving member so that the protruding length of the abutting member from the strike plate can be adjusted;
The opening force reducing tablet according to any one of claims 1 to 3, further comprising:   The back surface side of the strike plate is provided with a receiving member to which the contact member is fixed, and the receiving member is configured to function as the biasing member. Opening-reducing tablet.   The receiving member is formed with a recess toward the back surface side, and elastic portions are formed at both end portions of the bottom surface of the recess so as to protrude toward the back surface side. 6. The opening force reducing lock according to claim 5, wherein the unlocking lock is formed so as to be elastically deformed so that a length of protrusion toward the back surface side becomes smaller as the member is pressed. The adjusting member is interposed between the concave portion of the receiving member and the abutting member so that the protruding length of the corresponding contacting member from the strike plate can be adjusted. The opening force reducing tablet according to 6.