KR102590530B1 - Fire door open keeping device - Google Patents

Abstract

The present invention can maintain the open state of the fire door by reducing the size of the electromagnet while using less power, thereby simplifying the overall configuration and ensuring smooth operation, providing ease of production, assembly, and maintenance, and durability. In addition to the improvement of the sealing power, it is possible to construct the fire door so that it does not protrude.
A case installed on the door frame of a fire door and closed with a cover;
Positioning means connected to a door closer installed on the fire door inside the case to set an angle to maintain the fire door open;
open maintaining means for continuously maintaining the fire door in an open state at the opening angle set by the positioning means;
In normal times, the user can freely open and close the fire door, but in the event of a fire, it is characterized by including a holding release means to quickly close the fire door and keep it in a closed state by releasing the open maintaining means.

Description

Fire door opening maintaining device {FIRE DOOR OPEN KEEPING DEVICE}

The present invention relates to a fire door opening maintenance device. More specifically, it provides ease of production and assembly by simplifying the structure, reduces wear and damage during the operation process, miniaturizes the electromagnet, ensures smooth operation, and reduces power consumption. This relates to the provision of an improved fire door locking device that ensures smooth operation through structural improvement while reducing .

Fire doors installed at the entrance of various buildings such as houses or commercial buildings, evacuation stairs, and re-study areas automatically close open doors even without direct force from the user, eliminating the inconvenience of manually closing the doors one by one when users enter and exit. It is common to install a door closer that allows this.

A fire door that needs to be kept in an open state in conjunction with the above-mentioned door closer to close the fire door in order to prevent the spread of flame or smoke in the event of a fire and at the same time maintain the closed state stably. Requires an open maintenance device.

Fire door open maintenance devices as described above have been developed and used in various configurations in the past, and the contents of this prior art are examined through patent documents as follows.

Patent Document 1 includes a case 105 installed on a door frame;

A locking means (110) connected to the door closer (106) installed on the fire door (102) inside the case (105) to continuously maintain the fire door (102) in an open state;

In normal times, the locking means 110 is kept in the locked state to keep the fire door 102 in an open state, and in the event of a fire, the locking means 110 is released to quickly close the fire door 102. Consisting of (130);

The locking means 110 includes a cam block 113 inserted through a bushing 112 into an operating hole 111 formed on one side of the bottom of the case 105;

A cam plate 115 coupled to the upper side of the cam block 113 by forming a locking groove 114 on one side;

A head 117 of the operating arm 116, one end of which is connected to the door closer 106 and coupled to the lower side of the cam block 113;

an operating lever 121 maintained in the case 105 by a hinge pin 120 and installed in a vertical direction;

It includes a locking roller 122 that is mounted on the operating lever 121 and is disassembled and combined with the locking groove 114 to switch between the locking and unlocking states;

The release means 130 includes an electromagnet 131 that magnetically pulls the operating lever 121;

a pulling spring (132) that pulls the operating lever (121) in cooperation with an electromagnet (131);

A contact plate 135 coupled to the operating lever 121 and enabling close contact with the electromagnet 131 regardless of the flatness and deformation of the operating lever 121;

It is configured to include a horizontal ring 140 that is interposed between the contact plate 135 and the operating lever 121 and allows the contact plate 135 to move in all directions.

Patent Document 2 includes a body case (10) fixedly installed on one side of the door frame;

An unlock piston (20) formed with an inclined surface (201) at the front end and a locking protrusion (202) at the distal end, and installed with a coil spring (701) inside the body case (10);

A motor (30) capable of forward and reverse rotation installed inside the body case (10) by coupling an operating cam (301), which comes in close contact with the locking protrusion (202) and forces the unlock piston (20) to one side according to the direction of rotation, to a drive shaft. )and;

a control unit 40 that controls the operation of the motor 30 according to signals provided from the fire detection means (S);

The cam block 501 with the first tooth engaging portion 501a formed on the bottom and the cam plate 502 with the locking groove 502a formed on the outer circumferential surface are configured to be disassembled and assembled so that the installation hole 102 of the body case 10 can be installed. ) A rotating body 50 installed inside and supported by a bushing 503 so as to be rotatable;

One end forms a second tooth engaging portion 601 that engages with the first tooth engaging portion 501a of the rotating body 50, and is coupled with a bolt nut to the rotating body 50 to allow angle adjustment, and the other end is attached to a fire door. A swing arm (60) pivotably coupled to the main arm (901) of the installed door closer (90);

A coil spring 701 is installed inside the operating groove 101 formed inside the body case 10 to operate in a direction perpendicular to the operating direction of the unlock piston 20 between the unlock piston 20 and the rotor 50. The operating ball 702 located on one side of the coil spring 701 slides with the unlock piston 20, and the locking member 703 located on the other side of the coil spring 701 is a locking means (702) that slides with the rotating body 50. 70) and consists of;

At least two coupling protrusions 501b are formed on the upper surface of the cam block 501, and coupling holes 502b corresponding to the coupling protrusions 501b are formed on the cam plate 502;

The outer peripheral surface (503a) of the bushing (503) and the inner peripheral surface of the installation hole (102) of the body case (10) where the bushing (503) is installed are formed to be inclined in an upper-gwang-lower-geop shape;

The body case 10 where the unlock piston 20 is located is configured with a pin-type roller R further disposed to facilitate the movement of the unlock piston 20.

Patent No. 10 - 1895156 - 0000 Patent No. 10 - 1939457 - 0000

None.

Among the above prior arts, in the case of Patent Document 2, the fire door can be easily opened by the user and is automatically closed when the user's force is excluded. In the case of Patent Document 1, the fire door is opened and closed automatically. Not only can it be maintained in good condition, but it is also designed to automatically close the fire door in the event of a fire.

In the case of Patent Document 2, which performs the function of a fire door open maintenance device, the operating arm connected to the fire door is connected to an operating lever and an electromagnet. Since the operating lever acts on the same principle as a lever, the longer the operating lever is, the longer the operating lever is. Since less force is applied, the size of the electromagnet can also be reduced.

However, in reality, the length of the operating lever cannot be increased arbitrarily. This is because the size (volume) of the fire door stopper increases, so a lot of installation space is required and the visual exposure is large, so the aesthetics after installation are poor. You won't be able to look good.

As the size of the fire door opening maintenance device increases, the production cost increases and external price competitiveness becomes weak. As a result, it is inevitable that it will be eliminated from the market. In the process of compromising to have an operating lever of an appropriate length, the electromagnet is used. The size will increase.

In this way, when the electromagnet is large, it consumes a lot of power and generates heat, which weakens durability. The attachment part of the electromagnet and the operating lever is kept horizontal, but when releasing, the operating lever is based on the operating point. Because of the circular motion (rotation), the electromagnet and the contact plate open at an acute angle.

If the electromagnet and the contact plate are not spaced apart in parallel but are spaced apart at an acute angle, more force is required due to an increase in friction (adhesion), and ultimately the force of the door closer must also be increased, so the locking device And the overall size of the door closer is not free from the phenomenon of enlargement.

If the strength of the electromagnet is weak, the fire door cannot be aligned with the wall or door frame during construction and will protrude to a certain extent, which not only makes the appearance unsightly, but also reduces the closing force to keep the fire door closed. The current situation is that it is not free from a major problem that makes it difficult to perform the fire prevention function in the event of an actual fire.

Accordingly, the present invention was invented to solve the above problems, and includes a case 105 installed on the door frame 102 of the fire door 101 and closed with a cover;

a positioning means (110) connected to the door closer (106) installed on the fire door (101) inside the case (105) to set an angle to maintain the fire door (101) open;

Open maintaining means (130) for continuously maintaining the fire door (101) in an open state at the opening angle set by the positioning means (110);

In normal times, the user can freely open and close the fire door 101, but in the event of a fire, a holding release means 150 is provided to quickly close the fire door 101 and keep it in a closed state by releasing the open maintaining means 130. including;

By reducing the size of the electromagnet while using less power, the fire door can be maintained in an open state, simplifying the overall configuration and ensuring smooth operation, providing ease of production, assembly, and maintenance, and improving durability. In addition, due to the improvement in sealing power, it is possible to achieve the purpose of constructing the fire door so that it does not protrude.

The present invention improves the structure of the fire door opening maintenance device so that the electromagnet and the operating lever can be attached and detached in parallel, thereby enabling miniaturization of the electromagnet and enabling attachment and detachment with less force, thereby reducing the overall size of the fire door locking device. It has an effect that can be done.

The present invention not only miniaturizes the electromagnet and generates strong adhesion to increase the open holding power of the fire door, but also guarantees smooth operation by implementing low voltage and low heat, increases durability, increases lifespan, and reduces cost. It has various effects, including increasing competitiveness.

Figure 1 is an exemplary perspective view showing a fire door open maintaining device to which the technology of the present invention is applied.
Figure 2 is a plan view showing a closed state of a fire door opening maintaining device to which the technology of the present invention is applied.
Figure 3 is a plan view showing the unlocked state of the fire door open maintenance device to which the technology of the present invention is applied.
Figure 4 is a plan view showing the open maintaining state of the fire door open maintaining device to which the technology of the present invention is applied.
Figure 5 is a perspective view of the operating lever of the fire door opening maintenance device to which the technology of the present invention is applied.
Figure 6 is a configuration diagram of the operating lever of the fire door open maintaining device to which the technology of the present invention is applied in an open state.
Figure 7 is a configuration diagram of the operating lever of the fire door opening maintenance device to which the technology of the present invention is applied in the released state.

Hereinafter, the preferred configuration and operation of the present invention for achieving the above object will be described in relation to the accompanying drawings.

Figure 1 is an exemplary perspective view showing a fire door open maintaining device to which the technology of the present invention is applied, Figure 2 is a plan view showing a fire door open maintaining device to which the technology of the present invention is applied in a closed state, and Figure 3 is a plan view of the present invention. Figure 4 is a plan view showing the fire door open maintenance device to which the technology of the present invention is applied in an unlocked state, Figure 4 is a plan view showing the open state of the fire door open maintenance device to which the technology of the present invention is applied, and Figure 5 is a plan view showing the open state of the fire door open maintenance device to which the technology of the present invention is applied. Figure 6 is a perspective view of the operation lever of the fire door open maintaining device to which the technology of the present invention is applied, Figure 6 is a configuration diagram of the operating lever of the fire door open maintaining device to which the technology of the present invention is maintained in the open state, Figure 7 is the technology of the present invention The configuration diagram of the applied fire door opening maintaining device with the operating lever in the released state is also explained.

The fire door opening maintaining device 100 to which the technology of the present invention is applied is a door installed on the fire door 101 inside a case 105 that is installed on the door frame 102 of the fire door 101 and closed with a cover. A positioning means (110) connected to the closer (106) to set the angle to be maintained by opening the fire door (101), and the fire door (101) at the opening angle set by the positioning means (110). Open maintaining means 130 to continuously maintain the open state, and in normal times, the user can freely open and close the fire door 101, but in the event of a fire, the open maintaining means 130 is released to close the fire door 101. It consists of a holding and releasing means (150) to quickly close and maintain the closed state.

The positioning means 110 inserts the cam block 113 into the operating hole 111 formed in the case 105 through the bushing 112, and is caught on one side on the upper side of the cam block 113. The cam plate 115 forming the groove 114 is coupled.

The head 117 of the operating arm 116, one end of which is connected to the door closer 106, is coupled to the lower side of the cam block 113, and the cam block 113, cam plate 115, and head 117 Ensure that it is firmly coupled with the bolt (118) and nut (119).

Serrations (S) are formed on the bottom of the cam block 113 and the top of the head 117 to determine the opening angle of the fire door 101 by determining the connection angle of the operating arm 116 in multiple stages. It prevents slip phenomenon in the combined state.

The open maintaining means 130 maintains a predetermined width in the longitudinal direction based on the fixing point P of the cam plate 115 so that the retaining rail 131 protrudes upward from the bottom surface of the case 105. Formed as a whole.

A roller guide 133 having a locking roller 132 is positioned on the upper side of the retaining rail 131 so as to engage with the locking groove 114 of the cam plate 115, and below the roller guide 133. A compression spring 134 is interposed.

The compression spring 134 expands to allow the locking roller 132 to be positioned in the locking groove 114 on the upper side, and applies force to the lower side using the holding and releasing means 150 to close the fire door. It serves to shear the force that releases the open holding state of (101).

A release piston 135 is coupled to the lower side of the compression spring 134 to transmit the release force to the holding release means 150, and the release piston 135 is a piston body 136 provided in a cylindrical shape. It is provided in a hemispherical shape to reduce the contact area at the bottom and minimize wear and damage during operation, and the piston head 137, which is in contact with the holding and releasing means 150, protrudes upward and compresses the piston body 136. It consists of a piston rod 138 that is inserted into the inner diameter of the spring 134 to prevent separation and separation while providing ease of force transmission.

It would be natural for the lower center of the piston head 137, which constitutes the release piston 135, to be the force point P1 for transmitting the force required for release to the holding and release means 150.

The holding and releasing means 150 raises the open maintaining means 130 through a rotational operation at the lower position of the opening maintaining means 130, causing the locking roller 132 to mesh with the locking groove 114 to engage the cam plate 115. ), and the operating lever 151 is maintained by the case 105 and the hinge pin (HP) so that the opening holding means 130 can be lowered to move the cam plate 115.

The hinge pin (HP) maintaining the operating lever 151 is located below the release piston 135 to the right of the fixing point (P) (as seen in Figure 2) and has an operating origin ( Make sure you have P2).

The operating lever 151 protrudes an operating arm 152 upward to the right of the operating starting point P2 and forms a contact surface 153 on its upper surface so that the piston head 137 can be connected to it, and the contact surface 153 ) To the right, an arc-shaped operating surface 154 is formed so that the lowering of the piston head 137 during the release process and the upward movement of the piston head 137 during the intermittent process can be performed smoothly.

A dispersion arm 155 is protruded to the lower right of the operating point P2, and at the end position of the dispersion arm 155, a first bent portion 156 is formed that is bent downward to the left, and the first bend At the end of the portion 156, a lever body 157 is formed toward the left and upward.

At the end of the lever body 157, a contact arm 165 is integrally formed to couple the attachment plate 161 so as to contact and separate from the electromagnet 160 obliquely mounted on the case 105, and the lever body The upper left side of (157) and the lower right side of the contact arm (165) are connected by two bent portions (166).

The open holding point (P3), which is the lower center of the electromagnet 160 and the upper center of the attachment plate 161, is lower than the fixed point (P) and higher than the force point (P1) and the operating starting point (P2). By allowing the operating lever 151 to be pulled and maintained with a small amount of force, the size of the electromagnet 160 can be minimized.

The electromagnet 160 is installed at an angle, and the contact arm 165 is parallel to the bottom of the electromagnet 160 through the second bent portion 166 in the lever body 157 and is positioned higher than the lever body 157. This is to minimize separation resistance due to friction, etc. by allowing the electromagnet 160 and the attachment plate 161 to be separated while maintaining the same distance as possible when the operating lever 151 rotates through the operating starting point (P2) and the electromagnet 160 and the attachment plate 161 are initially separated. am.

A return spring 168 is connected to the middle position of the upper case 105 of the electromagnet 160 and the operating lever 151, and when the fire door 101 is switched to the closed or open position after release, the operating lever 151 is opened. ) so that it can be easily moved to a position where it can be combined with the electromagnet 160.

The case 105 located below the operating lever 151 is further equipped with a damper 170 made of a material such as rubber or urethane to reduce the shock generated when the operating lever 151 is lowered by releasing the magnetic force of the electromagnet 160. Make sure to exclude noise.

The lower part of the retaining rail 131 and the hinge pin (HP) position are covered with a reinforcing plate 171 to ensure stable operation by excluding phenomena such as the hinge pin (HP) moving or separating during the operation process. make it possible

The sum of the force with which the electromagnet 160 pulls the operating lever 151 and the force with which the return spring 168 pulls the operating lever 151 is the force and compression with which the door closer 106 closes the fire door 101. It is larger than the sum of the force with which the spring 134 expands, and the force with which the return spring 168 pulls the operating lever 151 is the force with which the door closer 103 tries to close the fire door 101 and the compression spring 134. ) is preferably smaller than the sum of the forces to expand so that the fire door 101 can be quickly closed by the door closer 106 when the force of the electromagnet 160 disappears.

The state of use of the fire door opening maintaining device 100 to which the technology of the present invention is applied as described above is as follows.

The operation of opening and closing the fire door 101 can be performed freely at any time by holding the handle and rotating it like a normal door. If it is desired to maintain the open state at a set angle, the positioning means 110 is used. By opening the fire door 101 to the open position set by , the open state can be maintained by the open maintaining means 130.

Looking at the fact that the open maintenance position is determined by the positioning means 110, the bolt that controls the operation arm 116 connected to the door closer 106 and the cambler 113 that maintains the cam plate 115 Loosen (118) and nut (119) to adjust the angle of the cam block (113) and operating arm (116), and then firmly tighten the bolt (118) and nut (119).

Then, the serrations (S) formed at the joint position between the head 117 of the operating arm 116 and the cam block 113 are engaged, and the adjusted position is maintained along with the intermittent force of the bolt 118 and nut 119. This makes it possible to maintain the set opening angle.

Of course, even if the fire door 101 is maintained in an open state by the open maintenance means 130, if the fire door 101 is closed with a force greater than the force required for open maintenance by a user, etc., the open maintenance is released. The fire door 101 is closed.

In addition, if a fire, etc. occurs while the open state is maintained by the open maintaining means 130 and information from the fire detection means is received, the open maintaining means 130 is released by the holding release means 150 and the door is opened. The fire door 101 is closed by the force of the closer 106 to close the fire door 101.

The process of maintaining the open state of the fire door 101 and the operation of closing the fire door 101 by fire detection in the open state are as follows.

Considering that the fire door 101 is maintained in an open state by the open maintaining means 130,

When the fire door 101 is opened and its opening angle is set by the positioning means 110, the operating arm 116 connected to the door closer 106 rotates, so the cam plate 115 connected thereto also rotates. It rotates.

When the locking groove 114 formed in the cam plate 115 reaches the position of the opening holding means 130, the cam plate 115 momentarily pushes the locking roller 132 maintained by the roller guide 133 to lower it. And at the same time, the compression spring 134 descends.

Afterwards, when the locking roller 132 matches the position of the locking groove 114 formed on the cam plate 115, it rises and engages by the return force (restoring force, expansion force) of the compression spring 134, and at the same time, the electromagnet 160 ), power is applied to generate magnetic force, and the attachment plate 161 provided on the contact arm 165 of the operating lever 151 is magnetically adsorbed to maintain the upward state.

At this time, the sum of the force of the electromagnet 160 to pull the operating lever 151 with its magnetic force and the force of the return spring 168 that pulls the operating lever 151 upward causes the door closer 106 to close the fire door 101. Since the force to close and the force to expand the compression spring 134 to lower the operating lever 151 are greater than the sum of the force, it is possible to continuously maintain the open state of the fire door 101 at the set open position.

In this way, if the fire door 101 is kept open and the fire door 101 has to be closed due to a fire, etc., the power supply to the electromagnet 160 is cut off and the magnetic force is lost, so it operates. The force that was magnetically pulling the lever 151 disappears.

At the same time, the compression spring 134 is interposed between the locking roller 132 coupled to the locking groove 114 and the release piston 135 in contact with the contact surface 153 formed on the upper surface of the operating arm 152 of the operating lever 151. Since the sum of this compressed and expanded force and the force of the door closer 106 to close the fire door 101 is greater than the force with which the return spring 168 pulls the operating lever 151, the fire door 101 is not closed. It will work.

In this operation process, when the operating lever 151 rises, it switches to an open state, and when the operating lever 151 moves down, it switches to a closed state. Looking at the operation of the operating lever 151 in detail as follows. .

When the operating lever 151 is raised to maintain the fire door 101 in the open state, the magnetic force of the electromagnet 160 along with the strong force of the return spring 168 acts on the force pulling the attachment plate 161. As a result, the operating lever 151 rotates to the upper left side based on the operating starting point (P2).

At this time, the release piston 135 is lowered and positioned on the operating surface 154 formed in an arc shape on the right side of the contact surface 153, and is pushed up by the rotation of the operating lever 151 to connect the return spring 168 and the electromagnet ( When the rise is completed by the pulling force, 160) is located on the contact surface 153, and the compression spring 134 is compressed to generate a force to expand.

Due to this force, the locking roller 132 is continuously pushed into the locking groove 114 to maintain the contact state, so that the open state can be maintained.

When the operating lever 151 is lowered, the magnetic force of the electromagnet 160 is released, so the force pulling the attachment plate 161 disappears, so the cam plate 115 rotates with the closing force of the door closer 106 and the locking groove (114) presses the catching roller (132) to lower it.

This force, in addition to the expansion force of the compression spring 134, is transmitted to the release piston 135 to press the force point (P1) of the contact surface 153, so the operating lever 151 moves downward to the left based on the operating starting point (P2). It turns around and goes down.

When the operating lever 151 is lowered in this way, the release piston 135 naturally moves from the contact surface 153 to the operating surface 154, and the attachment plate 161 is separated from the electromagnet 160.

In this process, the open holding point (P3) at the center position where the electromagnet 160 and the attachment plate 161 are attached is separated from the lower surface of the electromagnet 160 and the upper surface of the attachment plate 161 at equal intervals. Because the friction resistance cannot be maintained continuously, it spreads and is offset at the same time, helping the separation.

For example, when the electromagnet 160 and the attachment plate 161 are separated at an acute angle, the gap on one side is narrow and the gap on the other side is wide, creating friction resistance similar to rubbing with hands. Separation becomes difficult.

In the present invention, the overall shape of the operating lever 151 includes an operating arm 152, a distribution arm 155, a first bent portion 156, a lever body 157, a contact arm 165, and a second bent portion 166. It is configured to have a question mark-like shape so that when the operating lever 151 rotates and descends based on the operating starting point (P2), the contact arm 165 is separated from the electromagnet 160 so that it is separated (spread) at the same interval. This makes it possible.

In addition, in the case of the present invention, the position of the electromagnet 160 relative to the operating starting point (P2) of the operating lever 151, the open holding point (P3) where the electromagnet 160 and the attachment plate 161 are in close contact, and the operating lever Since the position of the force point (P) where the force pressing the release piston 135 acts to lower (151) is located at a higher position, the operating lever 151 can be maintained with less force compared to the prior art.

The present invention as described above can maintain the open state of the fire door by reducing the size of the electromagnet while using less power, thereby simplifying the overall configuration and ensuring smooth operation, providing ease of production, assembly, and maintenance. In addition to improved durability, it has the advantage of being able to construct a fire door without protruding due to improved sealing power.

100; Fire door open maintenance device
101; fire door 105; case
110; Position determination means 114; catch groove
115; Cam plate 130; Means of maintaining openness
132; Jamming roller 134; compression spring
135; Release piston 150; Maintenance release means
151; operating lever 157; lever support;
160; electromagnet 161; Attachment plate
168; return spring 170; damper
171; Reinforcement plate P; fixed point
P1; force point P2; operating point
P3; Open maintenance point

Claims (9)

A case 105 installed on the door frame 102 of the fire door 101 and closed with a cover;
a cam block 113 inserted through a bushing 112 into the operating hole 111 formed in the case 105; A cam plate 115 formed with a locking groove 114 on one side and coupled to the upper side of the cam block 113; An operating arm 116, one end of which is connected to the door closer 106 and which couples the lower side of the cam block 113 and the head 117; Bolts 118 and nuts 119 that firmly couple the cam block 113, cam plate 115, and head 117; Serrations formed on the bottom of the cam block 113 and the top of the head 117 to prevent slip phenomenon while determining the connection angle of the operating arm 116 and the opening angle of the fire door 101 in multiple stages ( Positioning means 110 for setting the angle to be maintained by opening the fire door 101, including S);
a holding rail (131) formed integrally with the longitudinal case (105) based on the fixing point (P) of the cam plate (115); A roller guide (133) positioned on the upper side of the holding rail (131) with a locking roller (132) so as to engage with the locking groove (114) of the cam plate (115); The fire door ( A compression spring 134 that transmits a force to release the open state of 101); It includes a release piston (135) coupled to the lower side of the compression spring (134) to transmit a release force to the holding and release means (150); The release piston 135 includes a piston body 136 provided in a cylindrical shape; A piston head 137 provided at the bottom of the piston body 136 in a hemispherical shape to reduce the contact area and minimize wear and damage during operation and contacting the holding and releasing means 150; The fire door 101 is opened at an opening angle set by the positioning means 110, including the piston rod 138 that protrudes upward from the piston body 136 and is inserted into the inner diameter of the compression spring 134. Open maintenance means 130 for continuous maintenance;
The open maintaining means 130 is raised through a rotational operation at the lower position of the open maintaining means 130 so that the locking roller 132 engages with the locking groove 114 to limit the movement of the cam plate 115, An operating lever (151) maintained by the case (105) and a hinge pin (HP) to lower the opening maintaining means (130) to move the cam plate (115); An electromagnet 160 mounted at an angle to the case 105 at the end of the lever body 157; After connecting and releasing the upper position case 105 of the electromagnet 160 and the middle position of the operating lever 151, when the fire door 101 is switched to the closed or open position, the operating lever 151 moves the electromagnet 160. Including a return spring 168 that allows it to be coupled with
In normal times, the user can freely open and close the fire door 101, but in the event of a fire, a holding release means 150 is provided to quickly close the fire door 101 and keep it in a closed state by releasing the open maintaining means 130. Contains;
The operating lever 151 includes an operating arm 152 that protrudes upward to the right of the operating point P2;
A contact surface 153 formed on the upper surface of the operating arm 152 so that the piston head 137 can be connected to it;
To the right of the contact surface 153, an operating surface 154 is formed in an arc shape to enable the piston head 137 to smoothly move downward during the release process and upward movement of the piston head 137 during the intermittent process;
a distribution arm (155) protruding to the lower right side of the operating point (P2);
a first bent portion 156 bent downward to the left at the end position of the distribution arm 155;
The lever body 157 formed from the end of the first bent portion 156 toward the left and upward;
A contact arm 165 that couples the attachment plate 161 to the end of the lever body 157 so as to contact and separate from the electromagnet 160;
It includes a second bent portion (166) connecting the upper left side of the lever body (157) and the lower right side of the contact arm (165);
When the electromagnet 160 and the attachment plate 161 are initially separated by rotating the operating lever 151 through the operating starting point (P2), the electromagnet 160 can be separated while maintaining the same distance as possible to minimize separation resistance. ) is installed at an angle and the contact arm 165 is parallel to the bottom of the electromagnet 160 through the second bent portion 166 in the lever body 157 and is positioned higher than the lever body 157. A fire door opening maintenance device. delete delete delete According to claim 1;
The sum of the force with which the electromagnet 160 pulls the operating lever 151 and the force with which the return spring 168 pulls the operating lever 151 is;
greater than the sum of the force with which the door closer (106) closes the fire door (101) and the force with which the compression spring (134) expands;
The force with which the return spring 168 pulls the operating lever 151 is smaller than the sum of the force with which the door closer 103 closes the fire door 101 and the force with which the compression spring 134 expands, thereby forming the electromagnet 160. A fire door opening maintenance device characterized in that the fire door (101) can be quickly closed by the door closer (106) when the force disappears. According to claim 1;
The lower center of the piston head 137 constituting the release piston 135 becomes a force point (P1) for transmitting the force required for release to the holding and release means 150;
The hinge pin (HP) holding the operating lever 151 serves as an operating starting point (P2) from which the operating lever 151 moves;
Let the open holding point (P3) be the position of the lower center of the electromagnet 160 and the upper center of the attachment plate 161;
The operating point (P2) is located at a lower position than the force point (P1) and the opening holding point (P3) so that the operating lever (151) can be pulled and maintained with a small force, thereby minimizing the size of the electromagnet (160). A fire door opening maintaining device characterized by: According to claim 1;
The lower part of the retaining rail 131 and the hinge pin (HP) position are covered with a reinforcing plate 171 to prevent the hinge pin (HP) from moving or separating, thereby ensuring stable operability. A fire door opening maintenance device. delete delete

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