JP2016041867A - Door lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light weight door lock capable of being manufactured at a low cost and being reasonably and easily assembled, and capable of being forcibly unlocked by retreating a latch bolt with a simple operation even when the door lock gets troubled due to wear or malfunction of an internal component.SOLUTION: A door lock 3 includes: a latch bolt 8 which is stored within a door 1 so as to move forward/backward; a first lever cam 6 which is rotatable synchronously with a lever handle; and an interlock lever 10 which is disposed so as to engage with the first lever cam 6 and the latch bolt 8 at both ends thereof. A second lever cam 7 having a protruding engagement cam 45 is rotatably provided to a pivot shaft of the first lever cam 6. A breakable lock pin 38 and one end of an interlock link 9 are disposed in a reverse rotation area of the engagement cam 45 so as to get engaged with each other when the engagement cam 45 is rotated reversibly, and the other end of the interlock link 9 is arranged so as to get engaged with the latch bolt 8. When the engagement cam 45 is rotated reversely, the engagement cam 45 gets engaged with the one end of the interlock link 9 to retreat the latch bolt 8 to thereby unlock the door lock.SELECTED DRAWING: Figure 1

Description

  The present invention applies when a load or impact is applied more than necessary when opening or closing the door, or when internal components are worn or deteriorated due to aging or frequent use, the door cannot be opened. Respond quickly, and with a simple operation, the latch bolt can be retracted to force the door open, and the main components can be molded with resin to reduce weight and reduce manufacturing costs, while assembling is rational and easy. It relates to door locks that can be performed.

  As a tube-type lock that is often used as a small door lock, the rear end of the slide plate is engaged with a locking piece of a rotating cam that moves in accordance with the rotation operation of the lever handle. There is one in which the rear end portion of the latch bolt is engaged with the front end portion, and the latch bolt is moved forward and backward by rotating the lever handle to lock and unlock (see, for example, Patent Documents 1 and 2).

The rotating cam has an engaging piece projecting on the opposite side of the locking piece, and engages one end of a spring receiver with the engaging piece, and a return spring between the other end and the end face of the spring groove. The rotating cam is biased so as to be rotatable in a certain direction by the elasticity of the spring.
When unlocking, the lever cam is used to rotate the rotating cam, the spring support is moved via the displacement of the engaging piece, the return spring is compressed, and the tip of the spring support is moved to the middle of the spring groove. The displacement of the spring support is regulated by contacting the provided step.

However, when the lever handle is subjected to an excessive torque or impact due to, for example, an erroneous operation or mischief of the unlocking operation, the spring support is bent around the base of the notch portion, and then the rotation cam is broken to be predetermined. Rotating beyond the angle, the slide plate moves backward and unlocks, the yoke is bent, the linkage operation of the yoke and latch bolt is lost, and the locking and unlocking by the forward and backward movement of the latch bolt becomes impossible and cannot be used There was a problem of becoming.
Even when the spring receiver does not deform or break, since the tip of the spring receiver is in contact with the stepped portion when unlocked, the abutting portion wears over time, and the rotating cam accordingly has a predetermined amount. There was a problem that the above situation occurred by turning more than an angle.

  In order to solve such a problem, the applicant has first and second engaging cams protruding from the rotating cam, and slides on the inner side of the lock body in conjunction with the rotating cam. An unlocking or opening door is provided that includes a slide plate that allows the bolt to move forward and backward, and has an overload deforming means that can be engaged with the engaging cam in either one of the first and second engaging cams. When the rotating cam rotates abnormally beyond the clean opening angle, the overload deforming means is deformed via the engaging cam, and a deformable shift rocker is provided in conjunction with the deformation, and the shift rocker When the lever handle is disengaged from the shifter and an abnormal operation of the lever handle is detected by the deformation of the overload deformation means, the shift rocker is deformed and engaged with the shifter, and the latch bolt or slide plate moves backward. Restrain the displacement and keep the door openable. Developed a door lock which is adapted to secure the Usage safety during abnormal operation of the over steering wheel has already proposed this (see, for example, Patent Document 3)

  The door lock is designed to ensure safety in use in response to an unusual door opening operation that deforms the overload deformation means, but on the contrary, it is more than necessary for the door opening operation. It is not possible to deal with a case where the door cannot be opened due to wear or impact, or due to wear or deterioration of internal parts due to aging or frequent use.

  For this reason, the applicant, as an emergency measure when the parts inside the door lock are broken at the time of locking or closing due to deterioration of function or fatigue over time, the extension part of the latch bolt to be broken is made of steel plate. When the connecting plate is movably mounted and the extended portion of the latch bolt is broken, the connecting plate is left behind, and a cam arm movable with the handle shaft is engaged with the rear portion of the connecting plate, and the front portion of the latch bolt Developed a door lock that engages an engagement pin projecting on the engagement hole and moves the latch bolt backward to enable unlocking (see, for example, Patent Document 4). .

The door lock is adapted to breakage of the extended portion of the latch bolt, but development that can cope with a situation in which the door cannot be opened due to functional deterioration or failure of all parts including the latch bolt is desired. It was.
In addition, when the conventional door falls into a situation where it cannot be opened, it is generally difficult to detach the door from the door cage by working the door end side or the suspension base side, and if it is urgent, the door must be destroyed, Even in that case, there is a problem that requires special tools and work and is large and dangerous.
On the other hand, in the conventional door lock, the lock case and the lock cover are made of steel plate, and the latch bolt and the latch cam are made of zinc alloy die-casting. In addition, there are problems such as high manufacturing costs due to press molding and die casting.

Japanese Utility Model Publication No. 446462 JP-A-9-203253 Japanese Patent No. 5452637 Japanese Patent No. 4828621

  The present invention solves such a problem, and loads and shocks are applied more than necessary when opening or closing the door, or internal parts are worn or deteriorated due to aging or frequent use, and the door is If it becomes impossible, you can quickly respond, and with a simple operation, you can retract the latch bolt to forcibly open the door, and the main components are molded with resin to reduce weight and reduce manufacturing costs. An object is to provide a door lock that can be assembled reasonably and easily.

  According to the first aspect of the present invention, a latch bolt accommodated inside the door so as to be able to move forward and backward, a first lever cam that can rotate in synchronization with the lever handle, and both ends of the first lever cam and the latch bolt can be engaged with each other. In the door lock comprising the interlocking lever, a second lever cam having an engaging cam projecting from the pivoting portion of the first lever cam is rotatably provided, and the engaging cam is engaged with the pivoting portion of the first lever cam. The first and second lever cams are provided so as to be able to rotate in synchronization with each other, and a lock pin and one end of an interlocking link are disposed in the reverse rotation region of the engagement cam, and these are connected to the engagement cam. The lock pin is disposed so as to be able to be engaged during reverse rotation, and the lock pin is provided so as to be broken via the engagement of the engagement cam, while the other end of the interlocking link is disposed so as to be engageable with a latch bolt. During reverse rotation of the cam Engage the engagement cam with one end of the interlocking link and retract the latch bolt so that the door can be opened. Applying more load or impact than necessary when opening or closing the door, or internal due to aging or frequent use Respond quickly when parts are worn out or their functions have deteriorated, making it impossible to open the doors. By simply operating the lever handle in the reverse rotation direction, the latch bolt is retracted to forcibly open the door. I am trying to get it.

According to the second aspect of the present invention, the lock pin is made of a synthetic resin so that the lock pin can be reliably and easily broken and the door is reliably and stably opened.
According to a third aspect of the present invention, the lock pin is disposed on the lock cover for housing the first and second lever cams and the latch bolt, or the pivot case of the lock case or the first lever cam, so that the lock pin can be disposed at various positions. , So that the selection can be made.
According to a fourth aspect of the present invention, the lock cover and the lock case, the first and second lever cams and the interlocking lever are made of synthetic resin, and the main components are molded by resin to reduce the weight and reduce the manufacturing cost. .

In the invention of claim 5, the interlocking link is made of steel, and the strength of the interlocking link is strengthened so that the forced opening can be performed reliably and stably.
According to a sixth aspect of the present invention, the first and second lever cams are separately provided, the pivotal support portion of the first lever cam is formed in a hollow shaft tube portion, and the second lever cam is rotatably accommodated in the shaft tube portion. Compared to the case where the first and second lever cams are integrally formed as in the prior art, these parts can be replaced, thereby facilitating the manufacture of parts and the convenience of maintenance.
According to the seventh aspect of the present invention, a notch portion is formed in the shaft cylinder portion of the first lever cam, and the engagement cam of the second lever cam is disposed so as to be engageable with the notch edge of the notch portion. The door can be opened reliably by a dynamic operation.
According to the eighth aspect of the present invention, a cam arm is provided on the peripheral surface of the shaft cylinder portion of the first lever cam, the tip end portion of the cam arm is arranged to be engageable with the tip end portion of the interlocking lever, and the operation of the first lever cam is controlled by the interlocking lever. This is linked to the operation of

According to the ninth aspect of the present invention, the interlocking lever is formed in a substantially inverted L shape, and a pair of convex portions are formed on both the front and back surfaces of the both ends of the interlocking lever in parallel with the moving direction of the latch bolt. We are going to be able to go smoothly.
The invention of claim 10 is provided with a pair of guide grooves engageable with the protrusion of the interlocking lever in the lock cover and the lock case, the guide grooves being formed in parallel with the moving direction of the latch bolt, The interlocking lever can be operated reliably and smoothly via the guide groove of the lock case. The invention according to claim 11 forms the interlocking link in a substantially L-shape, and the link extends along the side wall of the locking case. So that the interlocking link can be operated reliably and smoothly.
In the invention of claim 12, a pair of locking plates are formed on the front plate arranged in an overlapping manner on the mounting plate provided on the lock case, and the locking plates are engaged with the latch bolt insertion holes provided on the mounting plate. The front plate can be temporarily fixed to the mounting plate, making it easy to assemble the door lock and handling it during transportation, and prevent the front plate from being lost or dropped at that time, and can be assembled rationally and easily. I try to do it.
According to the invention of claim 13, a convex portion is provided on the pair of locking plates, a concave portion is provided at a corresponding position of the lock case and the lock cover facing the convex portion, and the convex portion can be engaged with and detached from the concave portion. The front plate and the mounting plate can be easily fixed temporarily.

  In the first aspect of the present invention, a second lever cam having an engaging cam projecting from a pivot portion of the first lever cam is rotatably provided, and the engagement cam is disposed to be engageable with the pivot portion of the first lever cam. At the same time, the first and second lever cams are provided so as to be able to rotate synchronously, and one end of a lock pin and an interlocking link is arranged in the reverse rotation region of the engagement cam, and these are engaged when the engagement cam is rotated in reverse rotation. The lock pin is disposed so as to be breakable through the engagement of the engagement cam, while the other end of the interlocking link is disposed to be engageable with a latch bolt, and the engagement cam is rotated in the reverse direction. Sometimes the engaging cam is engaged with one end of the interlocking link, and the latch bolt is retracted so that the door can be opened. Internal parts wear due to use or function is low To promptly correspond to when it becomes impossible to open door, by a simple operation by the reverse rotating operation of the lever handle retracts the latch bolt can forcibly be door opening.

In the invention of claim 2, since the lock pin is made of synthetic resin, the lock pin can be reliably and easily broken, and the door can be opened reliably and stably.
In the invention of claim 3, since the lock pin is arranged in the lock cover for accommodating the first and second lever cams and the latch bolt, or the pivot case of the lock case or the first lever cam, the lock pins can be arranged in various positions. The selection can be made.
In the invention of claim 4, since the lock cover and the lock case, and the first and second lever cams and the interlocking lever are made of synthetic resin, it is possible to reduce the weight and reduce the production cost by resin molding the main components. it can.

In the invention of claim 5, since the interlocking link is made of steel, the strength of the interlocking link can be strengthened and the forced opening can be performed reliably and stably.
According to a sixth aspect of the present invention, the first and second lever cams are separately provided, the pivotal support portion of the first lever cam is formed in a hollow shaft tube portion, and the second lever cam is rotatably accommodated in the shaft tube portion. Therefore, compared with the case where the first and second lever cams are integrally formed as in the prior art, those parts can be replaced, and parts can be easily manufactured and maintenance can be facilitated.
According to the seventh aspect of the present invention, the notch portion is formed in the shaft cylinder portion of the first lever cam, and the engaging cam of the second lever cam is arranged to be engageable with the notch edge of the notch portion. The door can be opened reliably by a moving operation.
According to the eighth aspect of the present invention, the cam arm protrudes from the circumferential surface of the shaft tube portion of the first lever cam, and the tip end portion of the cam arm is disposed so as to be engageable with the tip end portion of the interlocking lever. It can be linked to the operation of the lever.

According to the ninth aspect of the present invention, the interlocking lever is formed in a substantially inverted L shape, and each pair of convex portions is formed on both the front and back surfaces of the both ends of the interlocking lever in parallel with the movement direction of the latch bolt. And can be performed smoothly.
In the invention of claim 10, the lock cover and the lock case are provided with a pair of guide grooves that can be engaged with the projections of the interlocking lever, and the guide grooves are formed in parallel with the moving direction of the latch bolt. The interlocking lever can be operated reliably and smoothly through the guide groove of the lock case.
In the invention of claim 11, since the interlocking link is formed in a substantially L shape and is arranged so as to be movable along the side wall of the lock case, the operation of the interlocking link can be performed reliably and smoothly. In the invention of claim 12, a pair of locking plates are formed on the front plate arranged in an overlapping manner on the mounting plate provided on the lock case, and the locking plates are engaged with the latch bolt insertion holes provided on the mounting plate. Since the front plate can be temporarily fixed to the mounting plate, the door lock can be easily assembled and handled during transportation, and the front plate can be prevented from being lost or dropped. Loss and fall can be prevented and assembly can be performed rationally and easily.
According to the invention of claim 13, a convex portion is provided on the pair of locking plates, a concave portion is provided at a corresponding position of the lock case and the lock cover facing the convex portion, and the convex portion can be engaged with and detached from the concave portion. Since it is attached, the front plate and the attachment plate can be easily temporarily fixed.

It is a front view which shows the door closing state of the door lock to which this invention is applied. It is a front view which shows the lock case applied to this invention. It is a front view which shows the lock cover applied to this invention. It is a perspective view which decomposes | disassembles and shows the 1st and 2nd lever cam applied to this invention. It is a perspective view which decomposes | disassembles and shows the latch bolt applied to this invention, an interlocking lever, and an interlocking link. It is a front view which shows the 1st lever cam applied to this invention. It is an expanded sectional view which follows the AA line of FIG. It is an expanded sectional view which follows the BB line of FIG.

It is a front view which shows the 2nd lever cam applied to this invention. It is an expanded sectional view which follows the CC line of FIG. It is a front view which shows the interlocking lever applied to this invention. It is an expanded sectional view which follows the DD line of FIG. It is sectional drawing which follows the EE line | wire of FIG. It is an expanded sectional view which follows the FF line of FIG.

It is a front view of the front board applied to the door lock of this invention. It is sectional drawing which follows the GG line of FIG. It is a rear view of the front board applied to the door lock of this invention. It is an expanded sectional view which follows the HH line of FIG. It is a front view which shows the normal door opening state of the door lock applied to this invention. It is a front view which shows the emergency open state of the door lock applied to this invention. It is a front view which shows the condition at the time of the lock action of the lock mechanism used for the door lock applied to this invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. In FIGS. 1 to 21, reference numeral 1 denotes a door, which is attached so as to be rotatable around a hinge (not shown) at its hanging end. A substantially rectangular mounting hole 2 is provided inside the portion, and a box-shaped door lock 3 is embedded in the mounting hole 2.
The door lock 3 includes a bottomed box-shaped synthetic resin lock case 4 and a synthetic resin-made substantially rectangular plate-shaped lock cover 5 that closes the opening side of the lock case 4. Synthetic resin first and second lever cams 6 and 7 are pivotally supported on one side of the rear end so that they can rotate synchronously, and a synthetic resin latch bolt 8 can be advanced and retracted on the other front end. In the middle of the latch bolt 8, an interlocking link 9 such as a stainless steel plate, which is robust and elastic, and one end of an interlocking lever 10 made of synthetic resin are movably mounted, and the rear end of the lock case 4 A synthetic resin lock cam 11 constituting a lock mechanism is rotatably disposed on the other side of the unit.

The lock case 4 has a flat bottom surface 4a as shown in FIG. 2, is partitioned into a U-shape by a side wall 12 standing upright, and two large and small through holes 13 and 14 are formed at the rear end thereof. The lower end portion of the first lever cam 6 is rotatably inserted into the large-diameter through hole 13, and the rotary shaft of the lock cam 11 is rotatably inserted into the small-diameter through hole 14.
Further, a substantially triangular prism-shaped locking block 15 protrudes from an intermediate portion of the bottom surface 4 a, and a horizontally long locking block 16 protrudes adjacent to the side wall 12 adjacent to the block 15.

  In the figure, 17 is a pair of guide grooves formed parallel to each other on one side of the front end portion of the bottom surface 4a. The guide grooves 17 are formed parallel to the moving direction of the latch bolt 8 and interlocked with the guide grooves 17. A protrusion, which will be described later, at one end of the lever 10 is slidably engaged to restrict the forward and backward movement of the latch bolt 8. A curved groove 18 is formed between the guide grooves 17 and 17, and a flange at the rear end of a latch bolt 8 described later is slidably received therein.

  Two large and small guide grooves 19, 20 are formed in parallel to each other on the other side of the front end portion of the bottom surface 4a. The guide grooves 19, 20 are formed in parallel with the moving direction of the latch bolt 8, and the guide grooves 19, The movement of the interlocking lever 10 is regulated by slidably engaging a protrusion, which will be described later, formed at the tip of the interlocking lever 10 with 20.

A synthetic resin mounting plate 21 is integrally formed at the front end of the lock case 4, a countersunk-shaped screw hole 22 is formed at the upper and lower ends thereof, and a latch bolt insertion hole 23 is formed at an intermediate portion thereof. The latch bolt 8 is inserted into the insertion hole 23 so as to be able to be put in and out.
In the figure, 24 is a screw hole provided in the side wall 12 and the locking blocks 15, 16, 25 is a concave groove-shaped spring receiver formed in the side wall 12 on the rear end side, and 26 protrudes at a position close to the spring receiver 25. This is a stopper pin.

The lock cover 5 is formed in a rectangular flat plate shape as shown in FIG. 3, and a small-height side wall 27 protrudes around the back side thereof, and its end surface can be engaged with the flange surface of the side wall 12, A spring receiver 28 having the same shape is formed at a position corresponding to the spring receiver 25 on the rear end side.
Locking blocks 29 and 30 having the same shape and projecting at positions corresponding to the locking blocks 15 and 16 on the back surface of the lock cover 5 protrude from these end surfaces and the screw holes 24 corresponding to the end surfaces of the side walls 27. A screw hole 31 is formed on the surface.

  Further, guide grooves 32 and 32 having the same shape are formed at positions corresponding to the guide grooves 17 on the back surface of the lock cover 5, and the guide grooves 32 and 32 are formed in parallel with the moving direction of the latch bolt 8. The protrusions (described later) at one end of the interlocking lever 10 are slidably engaged with the grooves 32, 32 to restrict the forward and backward movement of the latch bolt 8. In the figure, reference numeral 33 denotes a concave groove formed between the guide grooves 32 and 32, which is formed in the same manner as the concave groove 18.

  Two large and small guide grooves 34 and 35 are formed at positions corresponding to the guide grooves 19 and 20 on the back surface of the lock cover 5, and the guide grooves 34 and 35 are formed in parallel with the moving direction of the latch bolt 8. The guide grooves 34 and 35 are slidably engaged with protrusions, which will be described later, formed at the distal end portion of the interlocking lever 10 to restrict the movement of the interlocking lever 10.

  In the figure, 36 and 37 are through holes of the same diameter formed at positions corresponding to the through holes 13 and 14 of the lock cover 5, and the upper end portion of the second lever cam 7 is rotatably inserted therein, and the lock cam 11. The upper part of the pivot shaft is inserted so as to be pivotable.

A lock pin 38 protrudes from the back surface of the lock cover 5, and a lower end portion of the lock cover 5 is disposed so as to be engageable with one side of an engagement cam described later that protrudes from the second lever cam 7.
The lock pin 38 is always located on the reverse rotation region side of the engagement cam, and promotes the normal rotation of the engagement cam in the clockwise direction. For example, the latch bolt 8 is not retracted or cannot be opened. Sometimes, when the second lever cam 7 is rotated in the reverse direction, it engages with one side of the engagement cam and breaks, urging the second lever cam 7 to rotate in the reverse direction, and engaging the engagement cam with the interlocking link 9. At the same time, the link 9 is pulled backward to forcibly retract the latch bolt 8 so that the door can be opened.

In this case, the lock pin 38 is not limited to the back surface of the lock cover 5, and can be provided at a position corresponding to a shaft cylinder portion (described later) of the lock case 4 or the second lever cam 6.
In addition, in the figure, 39 is a locking piece projecting over the locking blocks 15 and 16, and 40 is a concave groove formed on the back surface of the lock cover 5 corresponding to the locking piece 39. Can be engaged with

The first lever cam 6 is provided with a hollow shaft tube portion 6a at the base end portion on the pivot side, and a step portion 42 is formed in the lower portion of the shaft hole 41 therein, and the second lever cam 7 is rotated in the shaft hole 41. It is locked so that it can move.
A lower end portion of the shaft tube portion 6a is rotatably disposed around a mouth edge portion of the through hole 13, and a notch portion 43 is formed on a peripheral surface thereof.

  The cutout portion 43 is formed by cutting out a substantially 1/4 circumferential surface of the shaft tube portion 6a, and the engagement engagement cam 45 of the second lever cam 7 is rotatably mounted on the cutout surface 44. The portion is disposed so as to be engageable with the cutout edges 43a and 43b. The engagement engagement cam 45 is engaged with the notch edge 43a, so that the first and second lever cams 6 and 7 can be rotated forward.

A cam arm 46 is integrally formed on the peripheral surface of the shaft cylinder portion 6a so as to protrude, and its tip end portion is disposed so as to be engageable with the tip end portion of the interlocking lever 10.
The cross section of the cam arm 46 is formed in an H-shaped frame structure as shown in FIG. 8 to reduce the weight and improve the strength. In the figure, reference numeral 47 is a convex part projecting up and down at the tip of the cam arm 46, and the lower convex part 47 is slidably disposed on the lock case 4, and 48 is one side of the base side of the cam arm 46. A set spring 49 is interposed between the spring receiver 25 and a groove-shaped spring receiver formed in the above.

The second lever cam 7 is formed in a substantially cylindrical shape, and the engagement cam 45 projects from the peripheral surface of the second lever cam 7, and an irregularly shaped square hole 50 is formed therein. A lever handle (not shown) is formed in the square hole 50. A square core bar 51 protruding at the tip is inserted so as to be engageable.
The latch bolt 8 has a substantially wedge-shaped head shape, and is provided with a shaft-like neck portion 52 at the rear portion thereof, and a cup-shaped flange 53 protruding from the rear portion of the neck portion 52. 39, a conical coil-shaped latch spring 54 is inserted between the spring 39 and the latch bolt 8 through the elasticity of the spring 54 so as to move forward.

One end of the interlocking link 9 and the interlocking lever 10 is movably attached to the neck 52, and the interlocking link 9 is formed by cutting a stainless steel plate into a thin width and bending it into a substantially L shape. A notch groove 55 is formed at the front end of the bent piece 9a on the front side, and a bent piece 9b is formed on the rear side of the interlocking link 9 so as to be shorter than the bent piece 9a. The engaging piece 9c is formed by bending the end edge of the outer side further outward.
And the said notch groove 55 is inserted in the neck part 52, the intermediate | middle linear part is inserted so that it can slide to the front-back direction between the side wall 12 and the latching block 16, and the bending piece 9b and the engagement piece 9c are engaged. It is arranged close to the rear of the cam 45.

  The interlocking lever 10 is formed in a substantially inverted L shape, a notch groove 56 is formed in the base end portion thereof, and an L-shaped bent portion 10a is formed in the other end thereof. A pair of convex portions 57 and 58 are arranged in parallel to each other, and the convex portions 57 and 58 are formed in parallel with the moving direction of the latch bolt 8, and these are formed in the guide groove 32 of the lock cover 5 or the guide groove 17 of the lock case 4. Is slidably engaged.

In addition, a pair of convex portions 59, 60, 61, 62 are arranged in parallel to each other on the upper and lower peripheral surfaces of the distal end portion of the interlocking lever 10, and these are formed in parallel with the moving direction of the latch bolt 8, and these are locked. 5 is slidably engaged with the guide grooves 34 and 35 of the guide 5 or the guide grooves 19 and 20 of the lock case 4.
The cross-section of the intermediate portion of the interlocking lever 10 is formed in an H-shaped frame structure as shown in FIG. 13 to reduce the weight and improve the strength.

The lock cam 11 is formed in an irregular frame structure, and a hollow shaft portion 63 projects from the upper and lower ends of the pivot side, and the shaft portion 63 is formed through the through hole 37 of the lock cover 5 and the through hole of the lock case 4. 14 is rotatably inserted.
A sawtooth-shaped engagement hole 64 is formed inside the shaft portion 63, and a handle shaft 65 that can move together with a thumb knob (not shown) provided indoors in the engagement hole 64 is engageable. The partition cam 11 can be rotated synchronously around the shaft portion 63 by being inserted and rotated by the handle shaft 65.

  An engagement cam 66 having a roof shape in plan view projects from the side opposite to the pivot side of the lock cam 11, and the engagement cam 66 has a rear end portion as shown in FIG. 1 when the door is closed before a lock (locking) operation. When the locking operation from the indoor side is performed, the engagement cam 66 is engaged with the distal end portion of the interlocking lever 10 as shown in FIG. The forward position is constrained to prevent the latch bolt 8 from moving backward, and the closed state can be maintained.

A pin 67 projects downward from the lower surface of the base side of the engagement cam 66, and one end of a snap spring 68 is attached to the pin 67, and the other end is latched to the stopper pin 26.
A snap coil 69 is provided at an intermediate portion of the snap spring 68, and the lock cam 11 can be rotated by the elasticity accumulated in the snap coil 69.

In addition, in the drawing, reference numeral 70 denotes a vertical frame which is a door frame, and a latch receiving box 72 is attached to a receiving box receiving hole 71 at a middle and high position. It is attached so that its position can be adjusted, and a latch bolt 8 can be engaged with its inner wall surface.
In the figure, 74 is a receiving seat attached to the front portion of the troyoke 73, 75 is a front plate made of a vertically long stainless steel plate attached to the end face of the door 1, and screw holes 76 are formed at both ends in the length direction. A latch bolt in / out hole 77 is formed in the intermediate portion.
A pair of locking pieces 78 are bent inward on the left and right sides of the latch bolt in / out hole 77, and a substantially hemispherical convex portion 79 is formed on the outer surface of the locking piece 78. The lock case 4 and the lock cover 5 are detachably mounted in substantially hemispherical recesses 80 and 81 formed respectively.

The door lock of the present invention configured as described above, except for the interlocking link 9, the lock case 4 and the lock cover 5, the first and second lever cams 6 and 7, the latch bolt 8, the interlocking lever 10 and the lock cam 11 are made of synthetic resin. Therefore, it is possible to achieve uniform and inexpensive production by weight reduction and resin molding.
Moreover, since the door lock of this invention manufactures the 1st and 2nd lever cams 6 and 7 separately, it becomes possible to exchange each part at the time of those assembly, and maintenance, rational manufacturing control and parts Can be managed.

In addition, the first and second lever cams 6 and 7 engage their pivots coaxially so that they can normally rotate synchronously, and one of the second lever cams 7 rotates independently when the door cannot be opened. Since this is possible, the abnormal situation can be resolved only by rotating the second lever cam 7.
The front plate 75 is formed by press-molding a stainless steel plate, and the right and left side edges of the latch bolt in / out hole 77 are bent inward to form a pair of locking pieces 78 and 78, and a substantially hemispherical convex portion 79 is formed on the surface. Form.

  In the embodiment, the lock pin 38 protrudes from the back surface of the lock cover 5. However, the lock pin 38 may be erected at a position corresponding to the notch surface 44. In the former case, the degree of freedom of the position of the lock pin 38 is obtained. There is an advantage that it is easy to manufacture. In the latter case, since the lock pin 38 is erected on the notch surface 44, there is an advantage that it can be positioned accurately in the vicinity of the engagement cam 45. In addition, if the lock pin 38 is erected at the corresponding position of the lock case 4, the same advantage as that of the lock cover 5 can be obtained.

Thus, after assembling these parts, when assembling them, first, one end of the snap spring 68 is attached to the pin 67 of the lock cam 11, and the lower end portion of the shaft portion 63 is inserted into the through hole 14 of the lock case 4. The other end is hooked on the stopper pin 26, and the engagement cam 66 is engaged with the inside of the side wall 12 by the elasticity of the snap spring 68.
Next, the second lever cam 7 is inserted into the shaft hole 41 of the first lever cam 6, the engagement cam 45 is projected outside the notch 43, and then the first lever cam 6 is held and the lower end of the first lever cam 6. Is inserted into the through hole 13 of the lock case 4, and is placed on the outer periphery of the through hole 13 at the lower end of the shaft cylinder portion 7 a of the first lever cam 6. This situation is as shown in FIGS.

  Further, the latch bolt 8 is inserted from the outside of the latch bolt insertion hole 23, and the notch groove 55 of the interlocking link 9 and the notch groove 56 of the interlocking lever 10 are inserted into the front and rear positions of the neck portion 52. A latch spring 54 is inserted between the flange 53 and the locking piece 39. This situation is as shown in FIG.

Then, one end of the interlocking link 9 is rotated around the neck portion 52, the straight portion at the middle portion is inserted between the side wall 12 and the locking block 16, and the bent piece 9b and the engaging piece 9c at the rear end portion are inserted. Is arranged close to the rear of the engagement cam 45.
Further, one end of the interlocking lever 10 is rotated around the neck portion 52, the tip portion thereof is positioned on the lock case 4, and the L-shaped bent portion 10 a is disposed so as to be engageable with the tip portion of the first lever cam 6. .

After assembling each part in the lock case 4 in this way, the end face of the side wall 27 of the lock cover 5 is joined to and attached to the end face of the side wall 12 of the lock case 4, and the shaft end portion of the second lever cam 7 is attached to the through hole 13. Then, after inserting the shaft end portion of the lock cam 11 into the through hole 14, screws (not shown) are screwed into the screw holes 31 and 24 to attach the lock cover 5 to the lock case 4.
Then, after attaching the lock case 4 to the lock cover 5, the front plate 75 is superposed on the surface of the attachment plate 21, and the locking pieces 78, 78 are inserted into the latch-bottom insertion holes 23. The projections 79 projecting from the engagement are respectively engaged with the recesses 80 of the lock case 4 and the recesses 81 of the lock cover 79 to temporarily fix the front plate 75 to the mounting plate 21.

Therefore, after that, the door lock 3 can be handled in this temporarily fixed state, so that the subsequent transportation and assembly to the door 1 are convenient, and the front plate 75 can be prevented from being lost or dropped in the process.
When the door lock 3 is assembled, an appropriate tool can be inserted into the latch bolt in / out hole 77 to displace the locking piece 78 and the temporarily fixed state of the lever and the front plate 75 can be eliminated.

  Next, when the door lock 3 is incorporated into the door 1, the mounting hole 2 is formed at the middle and high positions on the opposite side of the door 1 from the suspension side, and the front plate 75 is temporarily fixed to the mounting hole 2. The door lock 3 is inserted, and a screw (not shown) is inserted into the screw hole 22 of the mounting plate 21 from the screw hole 76 of the front plate 75, and this is screwed into the door 1 and fixed. Therefore, the front lock 75 and the door lock 3 can be easily assembled into the door 1.

On the other hand, a receiving box receiving hole 71 is formed at the middle and high positions of the vertical rod 70, the assembly of the latch receiving box 72 is received in the receiving hole 71, and the front plate 74 on the surface side of the assembly is positioned on the end surface of the vertical rod 70. Then, a screw (not shown) is inserted into the front plate 74, and this is screwed into the vertical rod 70 and fixed.
In the assembly of the latch receiving box 72, a front plate 74 is fixed to the opening side of the latch receiving box 72 by caulking or the like, and a trowel 73 is attached to the inside thereof so that the position can be adjusted to the left and right.

The door lock 3 incorporating the door lock 3 is closed as shown in FIG. 1, and the latch bolt 8 protrudes into the troyoke 73 so as to be engageable. The latch bolt 8 is attached to the troyoke 73 side by the elasticity of the latch spring 54. It is energized.
At that time, one side of the engagement cam 45 of the second lever cam 7 is engaged with the cut-out edge 43a, the other side is engaged with the lock pin 38, and rotation in both forward and reverse directions is prevented, and the latch bolt 8 is retracted. Blocks and maintains a strong door.

Further, the first lever cam 6 is pressed by the set spring 49, is rotated counterclockwise in FIG. 1 about the shaft cylinder portion 6a, engages with the inclined surface of the locking claw block 15, and stops. The portion engages with the inner surface of the L-shaped bent portion 10 a of the interlocking lever 10.
On the other hand, when the lock cam 11 is unlocked (unlocked) when the door lock 3 is closed, the snap spring 68 is placed under non-snap operation, and the engagement cam 66 is engaged with the inner surface of the side wall 12 on the rear end side. The first lever cam 6 is spaced from the tip of the cam arm 46.

When the door 1 is opened from such a closed state, the lever handle (not shown) is rotated clockwise in FIG. 1 (indicated by the downward arrow in the figure).
By doing so, the square core 51 that moves together with the lever handle rotates in the same direction, and the square lever 51 and the second lever cam 7 engaged therewith move together. 1 is transmitted to one of the cutout edges 43a engaged with the engagement cam 45 through 45, and the first lever cam 6 rotates about the shaft cylinder portion 6a in the clockwise direction in FIG.

For this reason, the distal end portion of the cam arm 46 of the first lever cam 6 moves to the right in FIG. 1, and the interlocking lever 10 engaged with the distal end portion is pulled in the same direction via the L-shaped bent portion 10a. The protrusions 59 and 60 at the tip of the interlocking lever 10 are along the guide grooves 34 and 35 of the lock cover 5, and the protrusions 61 and 62 are along the guide grooves 19 and 20 of the lock case 4, respectively. Move to the right.
Further, the pair of convex portions 57 and 58 at the base end portion of the interlocking lever 10 move to the right in FIG. 1 along the guide groove 32 of the lock cover 5 and the guide groove 17 of the lock case 4.

Accordingly, the interlocking lever 10 moves as a whole to the right in FIG. 1, and its traction force is transmitted to the latch bolt 8 via the flange 53 engaged with the interlocking lever 10, and the latch bolt 8 pushes the latch spring 54. It retracts and retracts, and the interlocking link 9 moves with it.
Then, when the lever handle (not shown) is rotated forward by α °, in the embodiment, by about 10 °, the latch bolt 8 is pulled out of the troyoke 73 and unlocked, and the door can be opened. This situation is as shown in FIG.

On the other hand, the door opening operation or the immediately preceding closing operation was subjected to an excessive load or impact, or due to secular change or frequent use, internal parts were worn out or the function deteriorated, making it impossible to open the door. In this case, the door 1 becomes unusable.
In such a case, the conventional door 1 is generally difficult to be removed from the door cage by working the door stop side or the suspension base side, and if it is urgent, the door 1 must be destroyed. Has a large and dangerous problem requiring special tools and work.

The present invention responds promptly to such a situation, and can easily open the door without requiring a special tool or work.
That is, according to the present invention, after the occurrence of the above-mentioned situation, the lever handle is held and rotated in reverse, that is, rotated counterclockwise in FIG. In this way, the square core 51 rotates in synchronization with the lever handle, and the square lever 51 and the second lever cam 7 engaged with the same move together, and the rotational force is transmitted via the engagement cam 45. It acts on the lock pin 38 engaged with the engagement cam 45, and the lock pin 38 breaks.
At that time, since the lock pin 38 is made of a synthetic resin, the force required for the breakage is much smaller than that of the steel material. Therefore, the lock pin 38 can be easily broken without requiring a special arm force.

If the lock pin 38 is broken in this way, the engagement cam 45 can be rotated in the same direction. Therefore, after the breakage, the lever handle is further rotated in the same direction, and the interlocking engagement cam 45 is linked. 9 is engaged with the bent piece 9b or the engaging piece 9c.
In this way, the bent piece 9b of the interlocking link 9 engages with the engagement cam 45 and is pushed rightward in FIG. 1, and the straight line portion between the engagement block 16 and the side wall 12 is the same. Sliding in the direction, the bent piece 9a moves backward.

Then, when the lever handle is rotated by θ °, in the embodiment, about 45 °, and the bent piece 9a comes into contact with the front portion of the locking block 16 or moves to a close position where contact is possible, the link 9 The latch bolt 8 with one end attached is pulled by the link 9 and moves backward.
At this time, the interlocking lever 10 moves when pulled by the latch bolt 8, the protrusions 59, 60 at the tip thereof are along the guide grooves 34, 35 of the lock cover 5, and the protrusions 61, 62 are locked. 1 moves along the guide grooves 19 and 20 of the case 4 to the right in FIG. Further, each pair of convex portions 57 at the base end portion of the interlocking lever 10 is along the guide groove 32 of the lock cover 5, and the pair of convex portions 58 is along the guide groove 17 of the lock case 4, respectively in FIG. Move to the right.

Then, the latch bolt 8 further moves rearward and is pulled out from the trolley 73, and one side of the intermediate portion of the interlocking lever 10 comes into contact with the side surface of the locking block 15, and the movement of the interlocking lever 10 is stopped. This situation is as shown in FIG. 20, and the cam arm 46 of the first lever cam 6 is placed at the same position as in FIG. 1, and the door can be opened while maintaining this situation.
Thus, according to the present invention, the latch bolt 8 cannot be retracted at the time of locking, and it is possible to quickly cope with a situation where the door cannot be opened, and the door can be opened simply by reversing the lever handle without requiring a special tool or work. First-aid measures can be taken promptly in the abnormal situation.

On the other hand, since the lever handle is positioned obliquely upward after the door 1 is opened and is different from the normal horizontal position, this abnormal situation can be visually confirmed. Further, even after the lever handle is returned to the normal position, the lever handle can be easily reversed by breaking the lock pin 38, so that the abnormal situation can be confirmed and the quick restoration of the door 1 can be known.
Therefore, when the door 1 is subsequently restored, the failed door lock 3 is taken out of the door 1 and replaced with a new door lock 3 or replaced with a new door 1 to which the new door lock 3 is attached. The use state of the door 1 is restored.

When the locking mechanism is unlocked (unlocked) when the door lock 3 shown in FIG. 1 is closed, the handle knob 65 is rotated counterclockwise in FIG. When the locking operation is performed, elasticity is accumulated in the snap coil 69, and when the elasticity exceeds a certain value, the spring 68 snaps and the engagement cam 66 engages with the distal end portion of the interlocking lever 10. , The backward movement of the distal end of the interlocking lever 10 is prevented, the backward movement of the proximal end of the interlocking lever 10 is prevented, the backward movement of the latch bolt 8 to which the lever 10 is attached is prevented, and the locked state and the solid closed state Is formed. This situation is as shown in FIG.

  As described above, the door lock according to the present invention causes an excessive load or impact during opening or closing operation, or internal parts are worn or deteriorated due to aging or frequent use. Respond quickly when possible, and with a simple operation, the latch bolt is retracted to forcibly open the door, and the main components are molded with resin to reduce weight and reduce manufacturing costs. Can be done reasonably and easily.

DESCRIPTION OF SYMBOLS 1 Door 3 Door lock 4 Lock case 5 Lock cover 6 1st lever cam 6a Shaft cylinder part 7 2nd lever cam

8 Latch bolt 9 Link 10 Link lever 12 Side walls 17, 19, 20 Guide groove 21 Mounting plate 23 Latch bolt insertion holes 32, 34, 35 Guide groove 38 Lock pin

43 Notch 43a Notch edge 45 Engagement cam 46 Cam arms 57, 58 Convex 59-62 Convex 75 Front plate 78 Locking plate 79 Convex 80, 81 Concave

Claims (13)

  A latch bolt housed inside the door so as to be able to move forward and backward, a first lever cam that can be rotated synchronously with the lever handle, and an interlocking lever that is arranged to engage both ends of the first lever cam and the latch bolt. In the door lock, the second lever cam having an engaging cam protruding from the pivot of the first lever cam is rotatably provided, and the engagement cam is arranged to be engageable with the pivot of the first lever cam. Is provided so that it can rotate synchronously with the first and second lever cams, and a lock pin and one end of an interlocking link are arranged in the reverse rotation region of the engagement cam, and these can be engaged when the engagement cam rotates reversely. The lock pin is provided so that it can be broken through the engagement of the engagement cam, and the other end of the interlocking link is arranged to be engageable with a latch bolt. Connect the engagement cam Engages the end of the click, the door lock, characterized in that disposed to be door opening to retract the latch bolt.   The door lock according to claim 1, wherein the lock pin is made of a synthetic resin.   The door lock according to claim 1, wherein the lock pin is disposed on a lock cover for housing the first and second lever cams and the latch bolt, or on a pivot case of the lock case or the first lever cam.   The door lock according to claim 3, wherein the lock cover and the lock case, the first and second lever cams and the interlocking lever are made of synthetic resin.   The door lock according to claim 1, wherein the interlocking link is made of steel.   2. The door according to claim 1, wherein the first and second lever cams are separately provided, the pivotal support portion of the first lever cam is formed in a hollow shaft tube portion, and the second lever cam is rotatably accommodated in the shaft tube portion. Tablets.   The door lock according to claim 6, wherein a notch portion is formed in the shaft cylinder portion of the first lever cam, and an engagement cam of the second lever cam is arranged to be engageable with a notch edge of the notch portion.   The door lock according to claim 6, wherein a cam arm protrudes from a peripheral surface of the shaft cylinder portion of the first lever cam, and a distal end portion of the cam arm is disposed to be engageable with a distal end portion of the interlocking lever.   The door lock according to claim 1, wherein the interlocking lever is formed in a substantially inverted L shape, and a pair of convex portions are formed on both front and back surfaces of the both end portions in parallel with the moving direction of the latch bolt.   The door lock according to claim 9, wherein each of the lock cover and the lock case is provided with a pair of guide grooves that can be engaged with the convex portion of the interlocking lever, and the guide grooves are formed in parallel with the moving direction of the latch bolt.   The door lock according to claim 3, wherein the interlocking link is formed in a substantially L shape, and the link is movably disposed along the side wall of the lock case.   A pair of locking plates are formed on the front plate that is superimposed on the mounting plate provided in the lock case, the locking plates are inserted into latch bolt insertion holes provided in the mounting plate, and the front plate is used as the mounting plate. The door lock according to claim 3, wherein the door can be temporarily fixed.   13. A protrusion is provided on the pair of locking plates, a recess is provided at a corresponding position of the lock case and the lock cover facing the protrusion, and the protrusion is removably attached to the recess. Door lock.

Images