Blocking structure of anti-fire door lock

A blocking structure of an anti-fire door lock includes a latch set, a blocking pin set and a blocking base, wherein the latch set comprises a lock base and a latch that pivotally connected to the lock base. The blocking pin set disposed in an accommodating hole of the latch comprises a blocking pin and an elastic member, and the blocking base comprises a constraining slot. The elastic member is used for pushing the blocking pin to move and making the blocking pin to lodge into the constraining slot to prevent an anti-fire door from being opened.

FIELD OF THE INVENTION

The present invention is generally relating to a blocking structure of an anti-fire door lock. The invention particularly represents the blocking structure has a blocking pin disposed in a latch, wherein the blocking pin is wedged in a blocking base.

BACKGROUND OF THE INVENTION

With reference toFIG. 6, a conventional blocking structure of an anti-fire door lock400comprises a latch set410and a blocking base420, wherein the latch set410is mounted on an anti-fire door500, and the blocking base420is mounted on a door frame600. The latch set410comprises a main body411, a latch412and a linking set413, and wherein the latch412pivotally connects to the main body411. The latch412is able to protrude to the main body411or retract in the main body411selectively by the linking set413to make the anti-fire door500being opened or closed relative to the door frame600. The latch412comprises a blocking surface412a, and wherein the blocking surface412acontacts against the blocking base420to prevent the anti-fire door500from being opened when the latch412protrudes to the main body411. Oppositely, the blocking base420can not constrain the latch412when the latch412retracts in the body411, therefore, the anti-fire door500is able to be opened.

With reference toFIG. 6, the anti-fire door500is deformed because the elevation of environmental temperature while a fire accident occurs, and the latch set410produces displacement relative to the blocking base420at the same time. The anti-fire door500is able to be opened and is unable to achieve the function of fire excluding when the latch412is displaced to make the blocking surface412aunable to contact against the blocking base420.

SUMMARY

The primary object of the present invention is to provide a blocking structure of an anti-fire door lock, wherein a blocking pin disposed in a latch is lodged into a constraining slot of a blocking base to prevent an anti-fire door from being opened while a fire accident occurs.

In the present invention, the blocking structure of the anti-fire door lock includes a latch set, a blocking pin set and a blocking base, wherein the latch set comprises a lock base and a latch, and the lock base comprises a main body and an accommodating slot. The latch disposed in the accommodating slot comprises a pivoting portion and a blocking portion, wherein the pivoting portion pivotally connects to the main body, and the blocking portion protrudes to the main body or retracts into the main body selectively by swinging around the pivoting portion as a swing center. The blocking portion comprises an accommodating hole having a constrained opening. The blocking pin set disposed in the accommodating hole swings simultaneously with the blocking portion, wherein the blocking pin set comprises a blocking pin and an elastic member. The blocking pin comprises a first constraining portion and a second constraining portion connected to the first constraining portion, wherein the first constraining portion of the blocking pin compresses the elastic member to make the elastic member produce an elastic restoration force when the blocking pin is located at a first position. The blocking base mounted on a door frame comprises a constraining slot, wherein the blocking pin moves from the first position to a second position when the elastic member pushes the blocking pin to move toward the constrained opening by the elastic restoration force, the second constraining portion is lodged into the constraining slot, and the first constraining portion is constrained in the accommodating hole.

The elastic member of the present invention pushes the blocking pin to make the second constraining portion of the blocking pin lodged into the blocking base and the first constraining portion of the blocking pin is constrained in the accommodating hole of the latch while a fire accident occurs. Therefore, the blocking pin enables to block the latch set and the blocking base to prevent the latch set mounted on the anti-fire door from departing from the blocking base mounted on the door frame, thus preventing the anti-fire door from being opened and achieving the function of fire excluding.

DETAILED DESCRIPTION OF THE INVENTION

With reference toFIGS. 1 and 2, a blocking structure of an anti-fire door lock100in accordance with a preferred embodiment of the present invention comprises a latch set110, a blocking pin set120and a blocking base130. With reference toFIG. 3, the latch set110is mounted on an anti-fire door200, the blocking base130is mounted on a door frame300, and the anti-fire door200is engaged with the door frame300and able to be opened or closed relative to the door frame300.

With reference toFIGS. 1, 2 and 4, the latch set110comprises a lock base111, a latch112and a pivoting rod113. The lock base111comprises a main body114, an accommodating slot115and a linking set116, wherein the accommodating slot115is surrounded by the main body114. The latch112, the pivoting rod113and the linking member116are disposed in the accommodating slot115. The latch112comprises a pivoting portion112aand a blocking portion112b, wherein the pivoting portion112aof the latch112pivotally connects to the main body114by the pivoting rod113. The latch112is driven by the linking set116to make the blocking portion112bof the latch112protruding to the main body114or retracting in the main body114selectively by swinging around the pivoting portion112aas a swing center.

With reference toFIGS. 1 and 4, the blocking portion112bof the latch112comprises an accommodating hole H, wherein the blocking pin set120is disposed in the accommodating hole H and swings with the blocking portion112bsimultaneously. In this embodiment, the accommodating hole H comprises a constrained opening H1and an installation opening H2. The blocking pin set120comprises a blocking pin121and an elastic member122. With reference toFIG. 4, the blocking pin121compresses the elastic member122to make the elastic member122produce an elastic restoration force when the blocking pin121is located at a first position.

With reference toFIGS. 1 and 4, the blocking pin set120further comprises a blocking member123and a fixing member124, wherein the blocking member123is a low melting point material and the melting point of the fixing member124is higher than the melting point of the blocking member123. In this embodiment, the blocking member123is a plastic material. The blocking member123is disposed at the constrained opening H1of the accommodating hole H, and the fixing member124is engaged with the installation opening H2of the accommodating hole H. Preferably, the fixing member124is selected from a screw or a pillared bolt. The blocking pin121is located between the blocking member123and the elastic member122, and the elastic member122is located between the blocking pin121and the fixing member124. One end of the elastic member122pushes the blocking pin121, and the other end of the elastic member122pushes the fixing member124. In this embodiment, the blocking pin121comprises a first constraining portion121aand a second constraining portion121bconnected to the first constraining portion121a, wherein the first constraining portion121ais located between the second constraining portion121band the elastic member122, the first constraining portion121acontacts against the elastic member122, and the second constraining portion121bcontacts against the blocking member123.

With reference toFIGS. 1, 2 and 4, the blocking base130comprises a constraining slot131corresponded to the constrained opening H1of the accommodating hole H. Referring toFIG. 4, an axis line X passes through the constraining slot131of the blocking base130and the accommodating hole H of the blocking portion112bwhen the blocking portion112bof the latch112protrudes to the main body114of the locking base111.

With reference toFIGS. 1, 2 and 4, in this embodiment, the blocking base130further comprises a base132and a lateral plate133protrudes to a bottom surface132aof the base132, wherein the constraining slot131is disposed on the lateral plate133. A constraining space S is defined between the bottom surface132aof the base132and the lateral plate133. The blocking portion112bis constrained in the constraining space S when the blocking portion112bof the latch112protrudes to the main body114of the locking base111.

With reference toFIGS. 1, 2 and 3, in this embodiment, the constraining slot131is an arc-shaped long slot that penetrates through the lateral plate133. Referring toFIG. 3, the constraining slot131comprises a first end131aand a second end131b, wherein a first spacing D1is spaced apart between the first end131aand the base132, a second spacing D2is spaced apart between the second end131band the base132, and the first spacing D1is smaller than the second spacing D2.

With reference toFIG. 5, the blocking member123is melted because the elevation of environment temperature while a fire accident occurs and is unable to constrain the blocking pin121in the accommodating hole H. Therefore, the elastic member122is able to push the blocking pin121to move toward the constrained opening H1by the elastic restoration force to make the blocking pin121move along the axis line X from the first position (disclosed inFIG. 4) to a second position (disclosed inFIG. 5).

With reference toFIG. 5, the second constraining portion121bis lodged into the constraining slot131of the blocking base130and the first constraining portion121ais constrained in the accommodating hole H when the blocking pin121moves to the second position. The blocking pin121constrained in the constraining slot131and the accommodating hole H simultaneously prevents the latch112from departing from the blocking base130and prevents the anti-fire door200from being opened.

With reference toFIGS. 1 and 5, preferably, the second constraining portion121bof the blocking pin121comprises a wedging member121c. The wedging member121cpasses through the constraining slot131, protrudes to the lateral plate133and is blocked by an outer lateral surface133aof the later plate133when the blocking pin121moves from the first position to the second position. The blocking pin121retracted from the constraining slot131to the accommodating hole H is avoidable by the wedging member121cto prevent the latch set110from departing from the blocking base130and prevent the anti-fire door200from being opened.

While this invention has been particularly illustrated and described in detail with respect to the preferred embodiments thereof, it will be clearly understood by those skilled in the art that is not limited to the specific features shown and described and various modified and changed in form and details may be made without departing from the spirit and scope of this invention.