JP4916927B2 - Door lock with latch - Google Patents

Description

  The present invention relates to a door lock with a latch that holds a door in a closed state by latch engagement with a latch engagement hole of a strike attached to a vertical frame of the door frame.

  A latch insertion hole is formed in the front plate of the lock case that is embedded inside the door, and the elastic force of the spring is applied to the latch that can be projected and retracted outward from the latch insertion hole to provide outward protrusion. In a door lock with a latch in which the latch is engaged with a latch engagement hole of a strike attached to a vertical frame of the door frame to hold the door in a closed state, rotation of a grip ball provided on the surface of the door The lock is unlocked by pushing or pulling the push-pull handle, and the latch is locked by contact with the strike when the door is opened or closed. Something that is immersive inside is known.

  In the door lock with a latch, a restriction projection is provided at an end located in the lock case of the latch, and the amount of protrusion of the latch is regulated by the contact of the restriction projection with a fixing portion such as a front plate, and the latch is removed. I try to stop it.

  By the way, in the door lock with a latch, when the door is swung to the closed position, the latch faces the engagement hole of the strike, and when the latch protrudes outward by the pressing of the spring and enters the engagement hole, Since the restricting protrusions impactly contact a fixed portion such as the front plate, there is a disadvantage that a relatively large collision sound is generated.

  In addition, the restriction protrusion is easily damaged by the collision of the restriction protrusion, and there is a problem in durability.

  An object of the present invention is to reduce a collision sound and to suppress a decrease in durability of a restriction projection in the above-described door lock with a latch.

  In order to solve the above-mentioned problems, in the present invention, a latch lock case is formed in which a latch insertion hole is formed in the front plate of the lock case embedded in the door and can be projected and retracted outward from the latch insertion hole. A latch that is provided with a restricting protrusion for restricting the protruding amount of the latch by abutting against the fixed portion at the end located inside, and the latch is urged in a protruding direction by a spring incorporated in the lock case. In the door lock with door, a rod that moves in the axial direction in conjunction with the movement of the latch is inserted into a guide hole provided in the lock case, and the rod is contacted and guided to the inner peripheral surface of the guide hole. A configuration is adopted in which a friction ring that provides resistance to movement of the latch in the protruding and retracting direction is fixed.

  As described above, in the door lock according to the present invention, the friction ring is fixed to the rod that moves in the axial direction in conjunction with the movement of the latch, and the friction ring is fixed by the guide hole provided in the lock case. Since the contact guide is made, the friction acting on the contact portion between the outer peripheral surface of the friction ring and the inner peripheral surface of the guide hole becomes the resistance of movement of the latch. The latch can be prevented from rapidly moving outward.

  For this reason, the restricting projection provided on the latch does not come into impact contact with the fixed portion, and it is possible to reduce the collision sound generated at the time of contact, and the impact force is applied to the restricting projection. Therefore, it will not be damaged, and a decrease in durability can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a plate fitting recess 3 is formed on the door end side surface of the door 2 that opens and closes the doorway of the door frame 1, and a case fitting hole 4 is formed on the closed end surface of the plate fitting recess 3. Is provided.

  In addition, an opening 5 that communicates with the case fitting hole 4 from the indoor side surface and the outdoor side surface is formed at the door end side end portion of the door 2. On the other hand, a plate-like strike 6 is attached to the vertical frame 1 a of the door frame 1 at a position facing the plate fitting recess 3, and a latch engaging hole 7 is formed in the strike 6.

  A push-pull lock 10 as a door lock with a latch is attached to the door end side end of the door 2. The push-pull lock 10 includes a lock case 11, a pair of bases 12a and 12b, a push handle 13 supported by one base 12a, and a pull handle 14 supported by the other base 12b.

  As shown in FIGS. 2 and 3, the lock case 11 has a rectangular tube shape with one end opened, and flanges 15 are formed on the upper and lower sides of the lock case 11 in the vertical direction. A front plate 16 covering the 11 openings is overlaid.

  The lock case 11 is fitted in a case fitting hole 4 formed in the door 2, and the flange 15 and the front plate 16 are fitted in the plate fitting hole 3, and the front plate 16 is an end face of the door 2. It is fixed to the door 2 by tightening a screw 8 screwed into the door 2.

  The lock case 11 has side plates 17 facing each other, and each side plate 17 is provided with a lever insertion hole 18 at a position facing the opening 5 formed in the door 2.

  The pedestals 12a and 12b are abutted against the indoor side surface and the outdoor side surface of the door 2 to cover the opening 5, and a connecting leg 12c to be inserted into the opening 5 is provided on the opposing surface of the pedestal 12a and 12b. 12c is mutually connected by the fastening of the screw 12d to the connection leg 12c of the base which opposes.

  The pedestals 12a and 12b have a pair of support arms 19 that are vertically opposed to each other, and a support pin 20 that supports the end of the push handle 13 is attached between the distal ends of the support arms 19 in one of the pedestals 12a. A support pin 21 that supports the end of the pull handle 14 is attached between the tips of the support arm 19 of the other base 12b.

  The push handle 13 is swingable about the support pin 20, and an L-shaped pressing piece 22 is continuously provided at the end of the swing center side. A pin 23 projects from the pressing piece 22 on the surface facing the one support arm 19, and the pin 23 is inserted into a long hole 24 formed in the one support arm 19.

  The long hole 24 has an arc shape centered on the support pin 20, and a compression spring 25 is incorporated in the long hole 24. The compression spring 25 urges the pin 23 toward one end of the long hole 24, and the push handle 13 is held in a state parallel to the surface of the door 2 by the abutment of the pin 23 against the one end of the long hole 24. Yes.

  On the other hand, the pull handle 14 is swingable about the support pin 21, and an L-shaped pressing piece 26 is connected to the end of the swing center side. A pin 27 protrudes from the pressing piece 26 on a surface facing the one support arm 19, and the pin 27 is inserted into a long hole 28 formed in the one support arm 19.

  The long hole 28 has an arc shape centered on the support pin 21, and a compression spring 29 is incorporated in the long hole 28. The compression spring 29 urges the pin 27 toward one end of the long hole 28, and the pull handle 14 is held in parallel with the surface of the door 2 by the abutment of the pin 27 against one end of the long hole 28. Yes.

  As shown in FIG. 2, a guide member 30 made of synthetic resin is incorporated in the upper part of the lock case 11. The guide member 30 is formed with a latch receiving hole 31 and a guide hole 32 at the back of the latch receiving hole 31. On the other hand, the lock case 11 is provided with a spring accommodation hole 33 at the back of the guide hole 32.

  A latch 34 is accommodated in the latch accommodation hole 31. As shown in FIG. 4, the latch 34 has a parallelogram shape, and has a first engagement surface 35 a and a second engagement surface 35 b formed on the front and rear sides of the front end portion, and on the front and rear sides of the rear end portion. A first stopper surface 35c and a second stopper surface 35d are formed.

  Here, the dimension between the first engaging surface 35a and the second stopper surface 35d parallel to the first engaging surface 35a and the dimension between the second engaging surface 35b and the first stopper surface 35c parallel to the first engaging surface 35a are shown on both sides of the latch receiving hole 31. It is approximately equal to the dimension between the faces.

  As shown in FIG. 2, the front end portion of the latch 34 can be protruded and retracted from a latch insertion hole 36 formed in the front plate 16 to the outside, and the upper and lower surfaces of the rear end portion located in the latch receiving hole 31 are A restriction projection 37 is provided. The restricting projection 37 is disposed in an extraction window 38 formed above and below the tip of the guide member 30, and the amount of protrusion of the latch 34 is increased by the contact of the restricting projection 37 with the inner peripheral front surface as a fixing portion of the extraction window 38. Regulated and secured.

  Note that the amount of protrusion of the latch 34 may be restricted by the contact of the restricting protrusion 37 against the inner surface of the front plate 16 serving as a fixed portion, with the extraction window 38 being a notch that opens at the front end surface of the guide member 30.

  As shown in FIGS. 2 and 4, a notch 39 that forms a forked piece is formed at the rear end of the latch 34 in the latch receiving hole 31, and the closed end surface of the notch 39 is formed. Is formed of a first taper surface 40a and a second taper surface 40b that are inclined in opposite directions, and has a V shape.

  A rectangular pressing element 41 is incorporated in the notch 39 of the latch 34, and a protrusion 42 provided on the side surface of the pressing element 41 slides in a long hole 43 formed in the side plate 17 of the lock case 11 in the left-right direction. It is inserted freely.

  One end of a rod 44 is connected to the latch 34, and the other end of the rod 44 is inserted into the guide hole 32 of the guide member 30.

  A friction ring 45 that is movable in the guide hole 32 is fixed to the other end of the rod 44. The friction ring 45 is made of rubber or synthetic resin and has elasticity, and its outer peripheral surface makes elastic contact with the inner peripheral surface of the guide hole 32, and the frictional resistance acting on the contact portion causes the rod 44 to move in the axial direction. It comes to give resistance.

  The rod 44 is pressed in the axial direction by a spring 46 incorporated in the spring accommodation hole 33, and the pressing element 41 is pressed against the closed end surface of the notch 39 in the latch 34 by the pressing, so that the rod 44 protrudes outward. Has been given sex.

  As shown in FIG. 2, a lock member 47 is incorporated in the lock case 11 below the latch receiving hole 31. The lock member 47 has a configuration in which a lock piece 47c is provided on the front edge of a bent piece 47b that rises upward from one side of the base plate 47a. The lock member 47 is supported so as to be movable up and down, and is biased upward by a coil spring 48 provided below the base plate 47a.

  The lock piece 47c can be freely moved into and out of the latch receiving hole 31 from an extraction window 38 formed in the lower portion of the latch receiving hole 31, and the lock protrusion 47c projects into the latch receiving hole 31 with the restricting projection 37 at the lower portion of the latch 34. The latch 34 is prevented from being inverted.

  Here, the inversion of the latch 34 means that, as shown in FIG. 4, when the first engagement surface 35 a of the latch 34 extends to one inner surface of the latch receiving hole 31, the first engagement surface 35 a This means that the latch 34 swings in a direction away from the inner surface.

  As shown in FIGS. 2 and 3, a first interlocking mechanism 50 is provided between the pull handle 14 and the lock member 47 to move the lock member 47 downward in conjunction with the swinging motion of pulling the pull handle 14. It has been.

  The first interlocking mechanism 50 is disposed between the pair of support arms 19 of the pedestal 12b, has one end facing the pressing piece 26 of the pull handle 14, and the other end facing the lock case 11 from the lever insertion hole 18. The other end of the pull lever 51 is connected to a swingable first lever member 54 that is pivotably supported by a pin 52 and is incorporated in the lock case 11 and has a lower end supported by a pin 53. An operation of drawing the pull handle 14 by providing a receiving plate 55 that opposes the left and right sides, and a pressing plate 56 that is connected to the front edge of the receiving plate 55 and has a tip portion disposed on the base plate 47a of the lock member 47. The pull lever 51 is swung around the pin 52 in conjunction with the first lever member 54, and the first lever member 54 is swung around the pin 53 by the action of the other end of the pull lever 51 pressing the receiving plate 55. Lever member 5 So that pushing down the locking member 47 in the pressing plate 56.

  Here, the pull lever 51 is biased by a spring 57 in a direction in which one end thereof abuts against the pressing piece 26 of the pull handle 14.

  A second interlocking mechanism 60 is provided between the push handle 13 and the lock member 47 to move the lock member 47 downward in conjunction with the swinging motion of pushing the push handle 13.

  The second interlocking mechanism 60 is disposed between the pair of support arms 19 of the pedestal 12a, one end faces the pressing piece 22 of the push handle 13, and the other end faces the lock case 11 from the lever insertion hole 18. The other end of the push lever 61 is supported by a swingable second lever member 64 which is supported in the middle of the push lever 61 by a pin 62 so as to be rotatable, and which is incorporated in the lock case 11 and whose lower end is supported by the pin 63. A receiving plate 65 facing the right and left sides is provided, a link piece 66 facing the first lever member 54 is provided at the end of the second lever member 64 on the swing center side, and a pin 67 is provided at the tip of the link piece 66. On the other hand, a link piece 58 facing the second lever member 64 is provided at the end of the first lever member 54 on the swing center side, and a long hole 59 into which the pin 67 is inserted is provided in the link piece 58. The push handle 1 The push lever 61 is swung around the pin 62 by swinging to push in, and the second lever member 64 is swung around the pin 63 by the action of the other end of the push lever 61 pressing the receiving plate 65, By the action of the link piece 66 of the second lever member 64 pressing the side edge of the long hole 59, the first lever member 54 is swung in the reverse direction, and the lock member 47 is moved by the pressing plate 56 of the first lever member 54. Is pushed down.

  Here, one end of the push lever 61 is biased by a spring 68 in a direction in which the push lever 61 comes into contact with the pressing piece 22 of the push handle 13.

  The door lock with a latch shown in the embodiment has the above-described structure, and FIG. 4 shows a state in which the leading end portion of the latch 34 is engaged with the latch engagement hole 7 of the strike 6. The door 2 is kept closed by the engagement of the hole 7.

  At this time, the tip of the lock piece 47c provided on the lock member 47 is located in the latch receiving hole 31 from the extraction window 38 and faces the regulation protrusion 37 of the latch 34, thereby preventing the latch 34 from being inverted. Yes.

  When the door 2 is opened in the closed state where the latch 34 is engaged with the latch engaging hole 7, the push handle 13 is pushed in or the pull handle 14 is pulled in.

  For example, when the push handle 13 is pushed in, the push handle 13 swings around the support pin 20, and the pressing piece 22 provided at the end on the swing center side presses one end of the push lever 61. Therefore, the push lever 61 swings in the direction indicated by the arrow in FIG.

  At this time, since the other end of the push lever 61 presses the receiving plate 65 of the second lever member 64, the second lever member 64 swings around the pin 63 in the direction indicated by the arrow in FIG.

  Here, since the pin 67 provided on the link piece 66 of the second lever member 64 is inserted into the long hole 59 formed in the link piece 58 of the first lever member 54, the swing of the second lever member 64. Due to the movement, the first lever member 54 swings around the pin 53 in the direction indicated by the arrow in FIG. 2, and the pressing plate 56 provided on the first lever member 54 presses the base plate 47 a of the lock member 47 downward. To do.

  When the base plate 47 a is pressed by the pressing plate 56, the lock member 47 is lowered, and as shown in FIG. 6, the lock piece 47 c is immersed in the extraction window 38 and is provided on the front end portion and the lower surface of the latch 34. Thus, the position of the restricting projection 37 is shifted up and down, and the latch 34 can be reversed.

  At this time, the pushing of the push handle 13 is continued, so that the door 2 swings in the opening direction by the pushing and the first engagement of the latch 34 with respect to the inner periphery of the latch engaging hole 7 formed in the strike 6. Due to the contact of the surface 35a, the latch 34 is inverted as shown by the chain line in FIG.

  When the door 2 further swings in the opening direction from this state, the latch 34 is brought into contact with the inner periphery of the latch engagement hole 7 by the contact of the first engagement surface 35a of the latch 34 as shown in FIG. It is immersed in 31 and the engagement with the latch engagement hole 7 is released, and the door 2 is opened.

  Here, when the latch 34 is inserted into the latch receiving hole 31, the pressing element 41 and the rod 44 are also moved in the same direction as the latch 34, and the spring 46 is contracted.

  When the pushing of the push handle 13 is released after the door 2 is opened, the push handle 13 is returned to a state parallel to the surface of the door 2 by the pressing of the compression spring 25, and the push lever 61 is also pushed by the pressing of the spring 68. 3 is returned to the standby position.

  Further, the pressing element 41 and the rod 44 are moved outward by the pressing of the spring 46, the latch 34 protrudes to the outside from the latch insertion hole 36, and the front surface of the pressing element 41 is formed at the rear end portion of the latch 34. The latch 34 is engaged with the second tapered surface 40 b at the closed end of the notch 39, the latch 34 is held in the inverted state shown by the chain line in FIG. 4, and the restricting protrusion 37 formed on the lower surface of the latch 34 It is in a state of facing the piece 47c.

  Further, the lock member 47 is raised by the pressing of the coil spring 48. At this time, since the restricting protrusion 37 of the latch 34 faces the lock piece 47 c, the lock member 47 rises to a position where the upper end of the lock piece 47 c comes into contact with the lower surface of the restricting protrusion 37.

  As the lock member 47 is raised, the first lever member 54 and the second lever member 64 are slightly swung toward the standby position shown in FIG.

  When the door 2 in the opened state is swung toward the closed position by, for example, pulling the push handle 13, the second engagement surface 35b of the latch 34 strikes at a position just before the door 2 is completely closed. 6, the latch 34 swings in the direction in which the second stopper surface 35 d abuts against the inner surface of the latch receiving hole 31 by the contact of the second engagement surface 35 b with the side edge.

  When the second stopper surface 35d of the latch 34 abuts on the inner side surface of the latch receiving hole 31, the side edge of the strike 6 moves toward the inside of the latch receiving hole 31 by a cam action that pushes the second engaging surface 35b. At the same time, the pressing element 41 and the rod 44 also move in the same direction.

  When the door 2 is closed and the latch 34 faces the latch engaging hole 7 of the strike 6, the latch 34, the pusher 41 and the rod 44 are moved outward by the pressing of the spring 46, and the latch 34 The front end portion enters the latch engagement hole 7 and engages with the latch engagement hole 7, and the door 2 is held in the closed state.

  Here, when the latch 34, the pressing element 41, and the rod 44 move outward due to the pressing of the spring 46, the friction ring 45 fixed to the rear end portion of the rod 44 is elastically applied to the inner peripheral surface of the guide hole 32. Since the frictional resistance that moves in the contact state and acts on the contact portion becomes the movement resistance of the rod 44, the latch 34 slowly moves outward.

  For this reason, the restricting protrusion 37 formed on the latch 34 does not impactly contact the inner peripheral front edge of the extraction window 38 formed on the guide member 30 or the inner surface of the front plate 16, and generates a large impact sound. There is nothing to generate. Further, since the impact force is not applied to the restricting projection 37, it is not damaged.

  When the pull handle 14 is pulled, the pull lever 51 swings around the pin 52, and the other end of the pull lever 51 presses the receiving plate 55 of the first lever member 54. The lock member 47 is swung down in the direction indicated by the arrow 2 to push down the lock member 47, and the lock member 47 is lowered, and the door 2 is opened by continuing the operation of pulling the pull handle 14.

  In the embodiment, a push-pull lock is shown as a door lock with a latch, but the door lock with a latch is not limited to this. For example, it may be a door lock in which the latch is inserted into the lock case by turning the grip ball, or a door lock in which the latch is inserted into the lock case by swinging the lever. May be.

Partially cutaway plan view showing an embodiment of a door lock with a latch according to the present invention Sectional view along the line II-II in FIG. Sectional view along line III-III in FIG. Sectional view along line IV-IV in FIG. Sectional view showing the immersion state of the latch Sectional view along line VI-VI in FIG.

Explanation of symbols

2 Door 11 Lock case 16 Front plate 32 Guide hole 34 Latch 36 Latch insertion hole 44 Rod 45 Friction ring 46 Spring

Claims (1)

A latch insertion hole is formed in the front plate of the lock case embedded in the door, and latched by abutting against the fixed portion at the end of the latch case that can be projected and retracted outward from the latch insertion hole. In the door lock with a latch provided with a restriction projection for restricting the protrusion amount of the latch, and urging the latch toward the protruding direction by a spring incorporated in the lock case,
A rod that moves in the axial direction in conjunction with the movement of the latch is inserted into a guide hole provided in the lock case, and the rod is contacted and guided to the inner peripheral surface of the guide hole so as to move in the direction of the latch. A door lock with a latch, characterized by fixing a friction ring that gives resistance to movement.

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