JPH0544452Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Purpose of the invention (field of industrial application) This invention relates to door locks used for partition doors, and in particular to an emergency release device for the door locks.

(Prior art and problems to be solved) This type of door lock usually has manual knobs on both sides of the door, connects them with a square shaft, and uses a cam by rotating the knobs. Usually, the latch bolt of the door, which is in an elastically closed state, is recessed into the door to open and close the door. Therefore, the door can be opened and closed by turning the knobs independently from both sides of the door.

When such a door lock is used in a bathroom or toilet, a locking mechanism or another lock that can only be operated from the inside is installed separately to prevent the door from being unlocked from the outside during use.

By the way, with this configuration, if an unexpected accident occurs to someone inside the bathroom, etc., even if you try to rescue them, you will not be able to open the lock from the outside, so you will have to destroy the door, lock, or window. There was a problem that I had to do it.

The present invention was developed to deal with such situations, and in the case of an emergency such as the one mentioned above, it is possible to easily open the lock using easily accessible tools such as a screwdriver or a coin. The object of the present invention is to provide a non-unlocking device for a door lock.

(2) Structure of the invention (technical means for solving the problem and its effects) In order to achieve the above object, the invention has a chamber supported by fixed cylinders on the protruding parts at both ends of the square shaft passing through the door body. Fix the outside knob and the indoor knob,
In a door lock in which the latch bolt is retracted by the rotation of a square shaft which is rotated by the rotation of the knob, the latch bolt is provided in a fixed cylinder on the indoor side, and has one end that is rotatable and protrudes from the fixed cylinder. A rotation prevention member is provided with a concave portion that engages and disengages from the square shaft by rotation, and the other end of the rotation prevention member is bent so that the bent portion faces the outdoor fixing cylinder. At the same time, the outdoor fixed cylinder is provided with a rotating member in which a groove is formed in the portion exposed to the outside, and the bent end of the rotation blocking member is locked to the end of the rotating member. It is characterized by:

With this configuration, even in the event of an emergency, a lock that is locked from the inside can be rapidly unlocked from the outside.

(Description of Embodiments) FIG. 1 is a plan view showing an embodiment of the present invention. The figure shows only the lock body, and the casing that covers the mechanism, the door body to which it is attached, etc. are omitted.

The outdoor knob 1 and the indoor knob 2 of the door lock A are connected by a square shaft 3, and this square shaft 3 is connected to a drive cam (not shown), and this drive cam always projects from the side of the door. It is assumed that the latch bolt 4 is engaged in an elastically biased manner.

When the knob 1 or knob 2 is rotated, the square shaft 3 and therefore the drive cam that engages therewith move, and the latch bolt 4 is recessed from the end face of the door so that the door can be opened and closed.

FIG. 2 is a cross-sectional view taken along the line B-B' in FIG. 6 is formed, and from this notched groove 6 protrudes a rotation preventing member 7 which is rotatably disposed within the fixed cylinder and has a knob 8 at its outer end.

A recess 7a is formed in the rotation prevention member 7, and this recess 7a is removed from the square shaft 3 by rotating the rotation prevention member 7. The rotation prevention member 7 is pivotally attached to a support portion 13' of a fixed plate 13 provided at the end of the fixed cylinder 5.

The end of the rotation prevention member 7 is bent and extended in a direction perpendicular to the plane of the paper, and reaches the fixed cylinder 9 on the outdoor side.
Furthermore, it reaches the inside of the fixed cylinder 9.

A rotary member 12 having a groove 11 on the surface of which a driver or the like is applied is attached to the fixed tube 9 so that the groove 11 is exposed on the surface of the fixed tube 9. A bent end portion of the rotation prevention member 7 is engaged with the other end of the rotation prevention member 7 .

With this structure, when the knob 8 is held indoors and the rotation prevention member 7 is rotated clockwise as seen in FIG. Knob 1 cannot be turned and will be locked.

When unlocking the lock from the outside in an emergency, a screwdriver, a coin, or the like is engaged with the split groove 11 to rotate the rotating member 12, thereby causing the rotation preventing member 7 to move in the opposite direction as shown in FIG. Since it rotates clockwise and disengages from the square shaft 3, the door can be opened using the outdoor knob 1.

(3) Effects of the invention As explained above, according to the invention, a door lock is provided with an indoor knob and an outdoor knob at both ends of a square shaft that passes through the door body, so that the door can be locked from the indoor side. Since the door can be unlocked from the outside if necessary, the door can be opened quickly from the outside in an emergency, and since the structure is simple, there are few failures, making it extremely effective as an emergency release device.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a door lock showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line B-B' of the same. 1...Outdoor knob, 2...Indoor knob, 3...
Square shaft, 4... Latch bolt, 7... Rotation prevention member, 5, 9... Fixed cylinder, 12... Rotating member.

Claims (1)

[Claims for Utility Model Registration] An outdoor knob and an indoor knob, each supported by a fixed cylinder, are fixed to the protruding parts at both ends of a square shaft passing through the door body, and are rotated by the rotation of the knobs. In a door lock in which the latch bolt is retracted by a square shaft, the latch bolt is rotatably attached to a fixed cylinder on the indoor side, with one end protruding from the fixed cylinder, and is engaged with and disengaged from the square shaft by rotation. A rotation prevention member having a concave portion is provided, and the other end of the rotation prevention member is bent so that the end faces the outdoor fixing tube, and the outdoor fixing tube has a portion exposed to the outside. An emergency release device for a door lock, characterized in that a rotating member having a groove formed therein is disposed, and a bent end of the rotation preventing member is locked to an end of the rotating member.