JP6145912B2 - Latch device with door opening assist mechanism - Google Patents

Description

  The present invention relates to a latch device with a door opening assist mechanism (hereinafter simply referred to as a latch device), and more particularly to a latch device that can open a door smoothly with a simple structure by eliminating a pressure difference between the inside and outside of the room.

  In highly airtight condominiums and buildings, etc., air pressure differences occur indoors and outdoors due to the operation of air conditioners and ventilation fans indoors, and negative pressure is usually generated on the indoor side, so a large force is required when opening the door, or Opening the door becomes difficult.

  In order to overcome the difficulty of opening the door due to the difference between the internal and external air pressures described above, the avoidance assist mechanism described in Patent Documents 1 and 2 is guided in the door so as to be movable in the direction perpendicular to the free side edge. By providing a latch-bolt-like opening assist rod, the inclined surface formed at the tip of the door is elastically pressed by the roller provided on the door frame side, and the door is forced using the wedge action generated between the inclined surface and the roller. The air pressure difference between the inside and outside of the room is eliminated by allowing the air to flow into the room through the gap.

Japanese Patent No. 4034216 JP 2005-127044 Japanese Patent No. 2641098

  The door opening assist mechanism with the above-described configuration requires that the dead bolt and latch bolt of the door be removed beforehand from the strike hole of the door frame when operating the opening assist rod. In addition to the handle and knob to be operated, it is necessary to provide an operation member for the opening assisting rod independently.

  Then, not only does the structure of the latch device etc. become complicated and the appearance does not look good, but the operation becomes complicated, and when the operation member for the opening assisting rod is operated first, the opening assisting mechanism does not operate, etc. There is still room for improvement.

  Therefore, the present invention provides a latch device with a door opening assisting mechanism that can operate the door opening assisting mechanism only by operating a handle or a knob, and an object thereof is to eliminate the various inconveniences described above.

  In order to achieve the above object, according to the first aspect of the present invention, an inversion latch mechanism and a door opening assist rod are provided in the lock box, and the inversion latch mechanism is provided at least in a portion protruding from the front plate of the lock box. A horizontal projection shape forms part of a parallelogram, and a latch head supported so as to be able to rotate around a vertical first rotation axis centered on the intersection of the diagonal lines, and a central portion as a side plate of the lock box A support end that is rotatably supported around a vertical second rotation shaft and that engages with the latch head is formed at one end, and an operation end is formed at the other end opposite to the support end with respect to the second rotation shaft. On the other hand, the door opening assist rod is guided so as to be movable in the front-rear direction perpendicular to the front plate of the lock box, and the front end portion forming the inclined surface is a vertical provided on the door frame side. On the other hand, the inner end of the locking lever and the door opening A cam body that is supported so as to be rotatable in a plane parallel to the side plate of the lock box is provided between the inner end portion of the lock box, and the inner end portion of the door opening assist rod is inserted into the cam body via a spring. A first actuating portion that can be pushed and a second actuating portion that engages with the operation end of the locking lever and pushes the locking lever, and has a deformed hole that passes through the rotating shaft of the cam body. The operating shaft is passed through, and a lever handle or knob is integrally mounted on the operating shaft.

  In the latch device according to the present invention configured as described above, when the cam body is rotated by holding the knob or the handle when the door is opened, the second operating portion rotates the locking lever to free the latch head. On the other hand, the first actuating part projects the door opening assist rod from the front plate via the push spring, and the slope of the front end engages with the roller on the door frame side to slightly open the door.

  Therefore, as in the conventional door opening assist device, the two operations of first removing the dead bolt and latch bolt from the strike hole and then operating the operation member for the door opening assist rod can be performed by one operation of the cam body. , Has the expected effect.

  In addition, since the door opening assist rod is pushed through the push spring, no excessive force is applied to the mechanism even if the timing of releasing the reverse latch and the timing of opening the door assist rod deviate. There are various effects.

1 is a partial cross-sectional side view of a latch device according to the present invention, showing a standby state. Sectional drawing by the II-II line of FIG. FIG. 2 is a partial cross-sectional side view of the latch device according to the present invention, showing a state where the handle is slightly turned to open the door. Sectional drawing by the IV-IV line of FIG. 1 is a partial cross-sectional side view of a latch device according to the present invention, showing a state where a handle is fully rotated for opening a door. Sectional drawing by the VI-VI line of FIG.

  A reversing latch mechanism, a door opening assist rod and a cam body for controlling these are provided in the lock box. When the door is opened, the operation of both the door opening assist rod and the reversing latch is controlled by one operation of the cam body. And it was possible to operate these with good timing by one operation of the knob.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a lock box. In the lock box 1, an inversion latch mechanism generally indicated by reference numeral 2, and a door opening assisting rod generally indicated by reference numeral 3 are provided.

  The reversing latch mechanism 2 is well known, and will be briefly described with reference to Patent Document 3. As shown in FIG. 2 of Patent Document, the latch mechanism 2 is at least a portion protruding from the front plate of the lock box. The horizontal projection shape has a latch head (1) forming a part of a parallelogram.

  In addition, the code | symbol which attached | subjected the parenthesis or the code | symbol in parenthesis shows the code | symbol of drawing of patent document 3 (hereinafter the same).

  As shown in the figure, the latch head (1) has a vertical first rotating shaft (5: reference numeral 4 in FIG. 1 attached to the present specification) centering on the intersection of the diagonal lines of the parallelogram. It is supported so that it can rotate freely.

  The latch head 2a of the so-called reversal latch mechanism configured as described above has an opening of a strike hole as the inclined surface (1a, 1b) rotates the door as shown in FIGS. The mode of engagement with the end edge changes, and the locking surface and the slope are interchanged.

  Returning to FIG. 1 attached to the specification of the present application, in this drawing, reference numerals 5 and 5 denote locking levers, respectively. The pair of locking levers 5 and 5 in FIG. It is supported so as to be rotatable around a vertical second rotation shaft 6.

  The locking levers 5 and 5 are linked to each other by the interlocking mechanism 7 and rotate symmetrically with respect to a horizontal plane (not shown) located between the locking levers 5 and 5.

  Furthermore, a support end 8 is assigned to a corner on the latch head 2a side of the front end portion (left end portion in FIG. 1) of each locking lever 5.

  In addition, the locking levers 5 and 5 are urged by the elastic force of the torsion coil spring 9 in the direction in which the one support ends 8 and 8 are close to each other.

  In addition, the end of each locking lever 5 opposite to the support end 8 with respect to the second rotating shaft 6 is an operation end 11.

  In the standby state shown in FIG. 1, that is, when the door is closed, the operation ends 11 and 11 are in contact with the non-numbered flat portion of the cam body 12, and in this state, the pair of locking levers 5 and 5 are supported. The ends 8, 8 are urged toward each other, and these engage with grooves (not shown) formed on the side surfaces of the latch head 2a, respectively, so that the angular position of the latch head 2a around the first rotation axis is increased. keep.

  On the other hand, as shown in FIG. 2, FIG. 4 and FIG. 6, the door opening assist rod 3 in the illustrated embodiment is a hollow frame, and is perpendicular to the front plate 14 by the side surface of the lock box and the unnumbered guide mechanism. It is guided so as to be movable in the front-rear direction (left-right direction in the figure).

  And as shown in FIG. 2, the front-end part which formed the inclined surface 15 is faced so that engagement with the vertical roller 17 provided in the door frame 16 side is possible.

  On the other hand, as shown in FIG. 1, the cam body 12 is provided between the inner end portion of the locking lever 15 and the inner end portion of the door opening assist rod 3.

  The cam body 12 in the illustrated embodiment has a shape in which the projection on the side surface of the lock box is integrally connected to the arm-shaped first actuating portion 18 below the thick plate block in which a part of the side surface is cut out by a string.

  When the cam body 12 is rotated clockwise as shown in FIG. 5, the first actuating portion 18 moves the door opening assisting rod 3 forward via the compression coil spring 19 as shown in FIGS. Extrude into.

  Moreover, the connection part of the plane part and circumferential surface of a cam body which are shown in FIG. 1 becomes the 2nd action | operation part which controls the operation end 11 of a latching lever.

  Furthermore, as shown in FIG. 1, the cam body 12 is formed with a deformed hole 21 (a square hole in the illustrated embodiment) along its central axis, and an operating shaft (not shown) that passes through the deformed hole 21 is formed. A lever handle or knob (not shown) is attached to one end and / or both ends. In addition, the code | symbol D shows a door in FIG.

  The latch device according to the present invention configured as described above operates the handle or knob from the closed state shown in FIGS. 1 and 2 to rotate the cam body 12 in the door opening direction (clockwise in the figure). As shown in FIGS. 3 and 4, the cam body 12 is slightly rotated in the clockwise direction before the inclined surface 15 of the door opening assist rod comes into contact with the roller 17.

  Therefore, the upper operation end 11 of the locking lever is separated from the flat portion of the cam body, while the lower operation end 11 is pushed upward by the connection portion between the flat portion of the cam body 12 and the circumferential portion, and a pair of engagement ends. The stop lever levers 5 and 5 are interlocked so that the front end portion is slightly expanded.

  That is, at this time, the engagement of the support end 8 of the locking lever with the locking groove (not shown) is released, and the latch head 2a becomes free.

  When the cam body 12 is further fully rotated clockwise by operating the handle or knob, the inclined surface 15 of the door opening assisting rod 13 rides on the roller 17 as shown in FIGS. The door D is slightly opened by the reaction force 17 exerted on the opening assist rod 13 (see FIG. 4), air flows into the room through the gap, the pressure difference is eliminated, and thereafter the door is lightly opened.

  If the engagement with the door 5 is released after the door is urged in the opening direction, a crease occurs between the latch head 2a and the support end 8 of the locking lever. The illustrated embodiment that biases in the opening direction is preferred.

DESCRIPTION OF SYMBOLS 1 Lock box 2 Latch mechanism 3 Door opening auxiliary pad 4 1st rotation shaft 5 Locking lever 6 2nd rotation shaft 7 Interlocking mechanism 8 Support end 9 Torsion coil spring 11 Operation end 12 Cam body 14 Front plate 15 Inclined surface 16 Door frame 17 Roller 18 First operating part 19 Compression coil spring 21 Deformed hole

Claims (1)

  A reversing latch mechanism and a door opening assist rod are provided in the lock box, and the horizontal projection shape of at least the portion protruding from the front plate of the lock box forms a part of a parallelogram, and the intersection of the diagonal lines. A latch head supported so as to be able to turn around a vertical first turning shaft centered on the center, and a center portion supported so as to be able to turn around a second turning shaft perpendicular to the side plate of the lock box, A support end that engages with the latch head is formed at one end, and a locking lever that has an operation end at the other end opposite to the support end with respect to the second rotation shaft. The front end of the lock box, which is guided so as to be movable in the front-rear direction perpendicular to the front plate of the lock box, has a front end faced so as to be able to engage with a vertical roller provided on the door frame side. Rotate in a plane parallel to the side plate of the lock box between the inner end of the locking lever and the inner end of the door opening assist A cam body that is supported is provided, and the cam body is engaged with a first operating portion that can push the inner end of the door opening assisting rod via a push spring and an operation end of the locking lever. A second operating part that pushes the locking lever is provided side by side, and the operating shaft is passed through a deformed hole that passes through the rotating shaft of the cam body, and a lever handle or knob is integrally attached to the operating shaft. Latch device with door opening assist mechanism.

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