JPH0427978Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a door lock that reduces locking noise. (Prior Art) In conventional door locks, as shown in Japanese Utility Model Application Publication No. 58-174576, for example, a cam that rotates together with a lock case, a latch bolt, or a handle rod is made of a metal member. is biased in the projecting direction or rotational direction by each spring, and when the lock is locked, these springs force the latch bolt to project forcefully. (Problem that the invention aims to solve) However, in such a door lock, the metal parts come into contact and rub against each other to perform the intended opening and closing operation, so the noise of their contact and friction is generated. In particular, as a result of these sounds resonating and amplifying within the lock case, these sounds became noticeable and became harsh when the door was opened and closed. This type of locking sound is particularly unpleasant when sleeping at night or in hospitals, and improvements have been desired for some time. In view of these points, the present invention is designed to prevent locking noise and create a comfortable living environment by installing synthetic resin suction members at positions related to the main components that are the source of locking noise. The purpose is to provide door locks with (Means for Solving the Problem) Therefore, the door lock of the present invention is a door lock in which the latch bolt can be retracted into the lock case by rotational displacement of a cam pivotally supported on the lock case. A guide plate made of synthetic resin is arranged so as to be able to come into contact with the cam, a latch shaft integrated with the latch bolt is slidably supported on this guide plate, and one end of the latch shaft can come into contact with the inner peripheral surface of the lock case. A latch damper made of synthetic resin and having a pair of leg pieces is attached, and a cam holder made of synthetic resin that can be engaged with the cam is attached to the other end of the latch shaft, and the engagement surface of this cam holder is It is characterized by being placed away from the cam to suppress the generation of locking noise. (Embodiment) Hereinafter, an illustrated embodiment in which the present invention is applied to a box lock will be described. In Figs. 1 to 7, reference numeral 1 denotes a door whose hanging base side is rotatably pivoted, and its free end surface is A reinforcing plate 3 is screwed integrally with the front plate 2. Bent pieces 5, 5 integral with a lock case 4 are welded to the reinforcing plate 3, and the lock case 4 is formed into a box shape with its periphery divided by side walls 6 as shown in the figure.
The bottom plate 7 has elongated insertion holes 8 and 9 and a circular cam housing hole 10 formed therein. Among these, the insertion holes 8 and 9 have their long axes perpendicular to each other, and the tongue piece 1 of the guide plate 11 is inserted into these holes 8 and 9.
2 and 13 are inserted. As shown in FIG. 6, the guide plate 11 is constructed by bending a belt-shaped flexible synthetic resin plate into an L-shape. The tongue piece 13 is provided protrudingly from the tip of the lower edge of the bent piece 15 . A lock case 4 is provided at the upper edge of the bent pieces 14 and 15 at a position facing the tongue pieces 12 and 13.
tongue piece 1 that can be attached to a cover (not shown) that closes the
6 and 17 are provided in a protruding manner, and a guide groove 18 is formed adjacent to one of the tongue pieces 17. The guide groove 18 is formed in a substantially U-shape, and a latch shaft 20 integral with the latch bolt 19 is accommodated in the groove 18 so as to be movable in the axial direction.
The latch bolt 19 is installed in and out of through holes 21 and 22 formed in the front plate 2 and the reinforcing plate 3,
A latch damper 24 is attached to the small diameter shaft portion 23 on the base side.
is detachably and slidably attached. As shown in FIG. 6, the latch damper 24 is constructed by bending a belt-shaped flexible synthetic resin plate into a substantially U-shape, and a U-shaped notch 26 is formed in the flat damper main piece 25. By fitting the cutout portion 26 into the small diameter shaft portion 23, the latch damper 24
It allows for the installation of On both sides of the damper main piece 25, a pair of outwardly curved leg pieces 27, 27 are protruded from opposite sides, and their edges are seated on both sides of the through hole 22 on the inner peripheral surface of the reinforcing plate 3. This allows the span of the leg pieces 27, 27 to expand against the bending elasticity. An annular groove 28 is formed in the shaft end of the small-diameter shaft portion 23 adjacent to the mounting position of the damper main piece 25, and a snap ring 29 is fitted into this groove 28 to define one end of the small-diameter shaft portion 23. ing. This snap spring 29 and the bent piece 15 of the guide plate 11
A latch spring 30 is interposed between the latch bolt 19 and the latch bolt 19, and the latch bolt 19 is urged outward in the axial direction via the spring 30. The shaft end of the latch shaft 20 extends outward beyond the guide groove 18, and a disk-shaped locking piece 31 is formed at the shaft end, and a cam receiver 32 is attached to and removed from the locking piece 31. Possibly installed. Cam receiver 3
2 is made of the same synthetic resin as the guide plate 11 ,
As shown in FIGS. 6 and 7, this is a square column with a trapezoidal cross section, and a through hole 33 in which a locking piece 31 can be accommodated is formed in the column axis direction. Also, among the side surfaces of the cam receiver 32 , the guide plate 11
A substantially U-shaped engagement groove 35 communicating with the through hole 33 is formed in the oblique engagement surface 34, and the shaft end of the latch shaft 20 is inserted into the groove 35. It is possible to accommodate. On the other hand, the cam accommodation hole 10 has an overhanging shaft portion 36a.
A cam 36 is rotatably mounted through the cam 36, and first and second arms 38, 39 are protruded from the circumferential surface of the cylindrical portion 37 at substantially diametrical positions. A substantially U-shaped groove 40 in which the latch shaft 20 can be accommodated is formed at the tip of the first arm 38, and the arm 38 is connected to the bent piece 15 of the guide plate 11 and the cam as shown in FIG. It is inserted between the engagement surface 34 of the receiver 32 , and one side thereof is normally positioned away from the engagement surface 34 as shown in the figure. Further, the tip of the second arm 39 is connected to the first arm 3.
8 and the other end near the side wall 6, and a spring case 41 is in contact with the inner surface thereof. The spring case 41 has an elongated box shape with one end open, and is placed between the side wall 6 and the bent piece 14 of the guide plate 11 with the closed end facing the second arm 39 side. It accommodates. Therefore, the second arm 39 is always connected to the cam spring 42.
The cam 36 is urged counterclockwise in FIG. 1 by the restoring force. In addition, 43 in the figure is a square hole formed in the shaft cylinder part 37 of the cam 36 , into which a handle rod (not shown) can be inserted, and a cover (not shown) is inserted into the opening.
An overhanging shaft portion 36b that can be fitted into a through hole provided in is provided in a protruding manner. Numerals 44, 45, and 46 are tubular bushes installed upright on the bottom plate 7, and the cover can be attached by screwing in screws (not shown) from the outside of the cover.
It also has the function of regulating the rotation angle of 9. 4
Reference numerals 7 and 48 indicate screw holes formed at the same positions in the front plate 2 and the reinforcing plate 3. (Function) When assembling a door lock configured in this way,
For example, the insertion hole 8 formed in the bottom plate 7 of the lock case 4 ,
9, the tongue pieces 12 and 13 of the guide plate 11 are inserted, and the latch shaft 20 with the latch damper 24 , the snap ring 29, and the latch spring 30 attached is accommodated on the guide groove 18 formed in the bent piece 15. When installing the snap spring 29, attach it to the annular groove 2 formed at one end of the latch shaft 20.
8, and the latch damper 24 is attached by fitting the notch 26 into the small diameter shaft portion 23 thus partitioned, and at this time, the legs 27, 27 of the latch damper 24 are placed toward the latch bolt 19 side. . After attaching the latch spring 30 to the latch shaft 20 in this way, the latch bolt 19 is inserted into the through hole 22 of the reinforcing plate 3 while holding it, and at the same time, the latch spring 30 is slightly compressed.
The spring 30 is positioned inside the bending piece 15, and the latch shaft 20 is housed in the guide groove 18. By doing this, the latch spring 30
is inserted between the snap spring 29 and the bending piece 15, and its restoring force urges the latch bolt 19 outward, and also urges the latch damper 24 in the same direction, so that the leg pieces 27, 27 are attached to the reinforcing plate 3. Seat it on the inner surface. Next, insert the protruding shaft portion 36a into the cam accommodation hole 10 of the bottom plate 7.
and install the cam 36 , and at that time the first
The arm 38 is positioned outside the bent piece 15 of the guide plate 11 , and the latch shaft 2 is inserted into the groove 40.
The cam receiver 32 is attached to the locking piece 31 that accommodates the protruding part of 0 and further protrudes from the first arm 38.
When installing the cam receiver 32 , as shown in FIG. 6 and FIG. Insert it toward the outer surface of the arm 38. After installing the cam receiver 32 in this way, the spring case 41
is housed between the bending piece 14 and the side wall 6, and the cam spring 42 is housed therein. In this way, the closed end of the spring case 41 comes into contact with the inner surface of the second arm 39 due to the restoring force of the cam spring 42, and the restoring force is exerted on the second arm 39, causing the cam 36 to move as shown in FIG. Force it counterclockwise. Therefore, as shown in FIG. 1, the inner surface of the first arm 38 is in close contact with the outer surface of the bending piece 15, and the outer surface of the first arm 38 is at a position separated from the engaging surface 34 of the cam receiver 32 . placed in As described above, in the present invention, the guide plate 11 made of synthetic resin, the latch damper 24, and the cam receiver 32 are each removably attached at predetermined positions.
It is easy to assemble, and the parts can be replaced individually, which is advantageous for maintenance. The door lock assembled in this way is shown in lock case 4 .
A cover is attached to the opening of the door 1, and this is attached to a predetermined position on the free end of the door 1. When the door is locked, it is placed in the state shown in FIG.
A latch bolt 19 protruding to the outside is inserted into a trowel buried in a door stop (not shown). To unlock the door under such circumstances, use the handle rod (not shown) inserted into the square hole 43.
Rotate the cam 36 to the cam spring 42.
Rotate counterclockwise in FIG. 1 against the In this way, the second arm 39 moves to the left in the top of FIG. 1, and the cam spring 42 is compressed via the spring case 41 that moves simultaneously, while the first arm 38 moves to the right in the top of the diagram. The outer surface thereof engages with the engagement surface 34 of the cam receiver 32 , causing the cam receiver 32 to move together. Therefore, the latch shaft 20 is integrated with the locking piece 31 on which the cam receiver 32 is attached.
However, the guide groove 18 resists the latch spring 30.
The latch bolt 19, which is integral with the shaft 20, moves into the lock case 4 and is pulled out of the lock case 4 , thereby unlocking the door 1 and allowing the door 1 to be opened. During such unlocking, the first arm 38 comes into contact with the engagement surface 34, and the cam receiver 32 comes into contact with the inner circumferential surface of the side wall 6. However, since the cam receiver 32 is made of synthetic resin, this does not occur. Contact sound and contact force are absorbed, and this suppresses the occurrence of contact noise like metal members. In addition, when the latch shaft 20 moves during the unlocking process, it may rub against the guide groove 18, producing a scraping sound, and when the latch spring 30 is compressed, it may rub against the inner surface of the bent piece 15, which is the seating surface, or on the snap spring 29. Sound or squeaks may occur, but since the guide plate 11 and the latch damper 24 are made of synthetic resin, the above-mentioned scraping noise is absorbed by them and diffused over the entire area, so that it does not occur as if they were metal members. This suppresses and reduces the generation of frictional noise. When the rotation of the handle rod is stopped at the same time as the door 1 is opened, and the handle that rotates the rod is released, the second arm 39 is pushed back by the cam spring 42, and the cam 36 is activated when the door is unlocked. Rotating in the opposite direction, the first arm 38 returns to its original position,
The state shown in FIG. 1 is restored by the latch bolt 19 protruding from the front plate 2. In this case, when the handle is released, the cam 36 is forcefully reversed by the cam spring 42, and the first arm 38 is forcefully brought into contact with the bent piece 15 of the guide plate 11 . However, in this case, since the bent piece 15 is made of synthetic resin, the contact noise is significantly reduced compared to a metal member, and the impact at that time is also alleviated. Further, as the first arm 38 returns, the latch shaft 20 is forcefully pushed back by the latch spring 30, and the legs 27, 27 of the latch damper 24 come to rest on the reinforcing plate 3. At that time, the leg pieces 27, 27 expand outward against their own elasticity and are slightly compressed by the kinetic energy of the latch shaft 20 when the seat is seated, and also slide on the small diameter shaft portion 23. It absorbs the energy and impact and comes to rest at a position where the elasticity and the latch spring 30 are balanced. Therefore,
The friction sound of the latch bolt 19 when moving through the through holes 21 and 22 can be absorbed, and the final movement of the latch shaft 20 is guided by the seating of the leg pieces 27 and 27, thereby reducing the friction between the latch bolt 19 and the through holes 21 and 22. It acts to avoid. Moreover, since the restoring force of the latch spring 30 is attenuated by the seating of the latch damper 24 , the shaft end of the latch shaft 20 is positioned to protrude outward from the restoring position of the first cam 38, and the locking piece 31
The engaging surface 34 of the cam receiver 32 attached to the first cam 3
8, when the latch shaft 20 returns to its original position, the engaging surface 34 will not come into contact with the first cam 38 and generate a contact sound, and even if the latch shaft 20 does not come into contact with the first cam 38, However, the contact noise can be reduced. Therefore, the occurrence of scraping noise and contact noise in the main components that become noise sources is prevented or reduced, and these noises can be prevented or reduced in the lock case 4.
There is no need to worry about it being resonated and amplified within the cover. When locking a door that has been unlocked in this way,
For example, if door 1 is closed gradually and latch bolt 19
When engaged with the end face of the door stop, the latch bolt 19
is pushed into the lock case 4 against the latch spring 30, and when the door is closed, the latch bolt 19
is forcefully protruded into the troyoke by the latch spring 30. In this case, as in the previous case, the latch damper 24 provides a buffering and sound absorbing effect, and the engaging surface 34 of the cam receiver 32 engages the stationary first cam 38.
Since it does not come into contact with the outer surface of the holder, the contact noise is not generated. In this way, the present invention reduces and suppresses the abnormal noise generated from the door lock when opening/closing the door 1, so a quiet living environment can be obtained, and it can be used while sleeping at night or when opening the door 1 at a hospital. No special care is required to close it. (Effect of the invention) As described above, the door lock of the present invention is a door lock in which the latch bolt can be retracted into the lock case by the rotational displacement of a cam pivotally supported on the lock case, and the lock case is made of synthetic resin. A guide plate is arranged so as to be able to come into contact with the cam, a latch shaft integrated with the latch bolt is slidably supported on the guide plate, and a pair of legs that can come into contact with the inner peripheral surface of the lock case are provided at one end of the latch shaft. A latch damper made of synthetic resin having a latch damper is attached, a cam holder made of synthetic resin capable of engaging with the cam is attached to the other end of the latch shaft, and the engaging surface of the cam holder is separated from the cam. In addition to suppressing contact and friction noise between the cam and the guide plate and between the cam and the cam receiver,
By reducing these sounds, we are able to solve the problem of locking noise that was previously identified with door locks, create a comfortable living environment, and require special consideration when opening and closing the door. There are practical effects that could make it unnecessary.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, with the lid open, and FIG. 2 is a cross-sectional view showing an embodiment of the present invention.
3 is a sectional view taken along line B-B' in FIG. 1, FIG. 4 is a sectional view taken along line C-C' in FIG. Fig. 6 is a plan view of the lock case used in the invention, with a part shown in cross section, Fig. 6 is an exploded perspective view showing the main parts of the invention, and Fig. 7 is an enlarged view of the cam receiver used in the invention. FIG. 4 ...Lock case, 11 ...Guide plate, 19...
Latch bolt, 20... Latch shaft, 24 ...
... Latch damper, 27 ... Leg piece, 32 ... Cam receiver, 34 ... Engagement surface, 36 ... Cam.

Claims (1)

[Scope of utility model registration request] In a door lock in which a latch bolt can be retracted into a lock case by rotational displacement of a cam pivotally supported on a lock case, a guide plate made of synthetic resin is arranged in the lock case so as to be able to abut with the cam, and this guide A latch shaft integrated with a latch bolt is slidably supported on a plate, and a latch damper made of synthetic resin is attached to one end of the latch shaft and has a pair of leg pieces that can come into contact with the inner peripheral surface of the lock case, and the latch shaft A door lock characterized in that a cam holder made of synthetic resin that can be engaged with the cam is attached to the other end, and the engagement surface of the cam holder is arranged at a distance from the cam.