KR200231032Y1 - Floor hinge - Google Patents

Abstract

A floor hinge for controlling opening and closing speed of a door installed in a building is disclosed. Floor hinge according to the present invention, the door rotation control assembly for controlling the opening and closing of the door, the lower casing for receiving the door rotation control assembly, and disposed on top of the lower casing and with the lower casing A plurality of chambers forming a plurality of chambers and including an upper casing for sealing the lower casing, the plurality of chambers in communication with each other is filled with a working fluid. The floor hinge of the present invention has the advantage of preventing the leakage of the working fluid from the cylinder to the chamber formed by the upper and lower casings, thereby maintaining a constant hydraulic force at all times.

Description

Floor hinge {Floor hinge}

The present invention relates to a floor hinge (floor hinge), and more particularly to a floor hinge for the door to be opened and closed at a constant speed more smoothly by installing a hydraulic cylinder to adjust the pressure of the hydraulic fluid in the hydraulic cylinder uniformly. will be.

In general, the door installed at the entrance of the building is hinged to the building, and if there is no separate fixing device or a device for buffering the opening and closing of the door, the door is opened or closed when a person applies a slight force. As a result, the door may hit a wall of the building or may collide with an occupant.

In particular, the door installed at the main entrance of the building can be easily opened and closed by external force such as wind, which may cause an accident.

In order to solve the above problems, devices that can control the opening and closing speed of the door have been used in recent years. The floor hinge is used as one of the devices for controlling the opening and closing of the door, and the floor hinge is generally used for the main entrance of the building.

The floor hinge is buried in the floor of the entrance of the building, so that the door opens and closes slowly by using hydraulic force and spring elasticity when the person opens and closes the door.

EP 0 407 150, issued to Ryobi Corporation on January 9, 1991, discloses a floor hinge with a hydraulic control system.

The floor hinge according to Ryobi's patent has a hinge casing in which a cylinder part is formed, and the hinge casing is provided with a hydraulic control system. The piston formed in the hinge casing is arranged with a piston moving in a straight line according to the door opening action corresponding to the elastic force of the return spring, the cylinder portion is divided into a front and rear chamber according to the position of the piston, the working fluid is filled in the chamber do.

The floor hinge according to the patent of Ryobi configured as described above, the piston is reciprocating along the cylinder portion as the door is opened and closed, in the process the working fluid is moved between the front and rear chamber through the hydraulic control system. The working fluid functions to cushion the progress of the piston returning to its original position by the return spring while the door is closed, so that the door is closed slowly.

However, the floor hinge of Ryobi is, when the door is opened and closed for a predetermined number of times, due to the pressure of the working fluid, between the cover and the casing covering the working fluid supply opening and between the cap and the casing blocking the piston mounting opening. There is a disadvantage that the working fluid leaks.

Korean Utility Model Registration No. 20-0162067 (granted to Kim Jong-yong on September 13, 1999) discloses a door opening and closing device that improves the problem of the floor hinge according to the above-mentioned Ryobi patent.

1 to 3 is a view showing a floor hinge 100 according to the patent of Kim Jong-yong, Figure 1 is an exploded perspective view of the floor hinge 100, Figure 2 is a longitudinal cross-sectional view of the floor hinge 100, Figure 3 is It is a cross-sectional view of the floor hinge 100.

As shown in FIGS. 1 to 3, the floor hinge 100 has a casing 110 in which a cam operating chamber 112 and a cylinder 114 communicate through a through hole 118 formed in a partition wall 116. , The cam assembly 120 mounted on the cam operation chamber 112, one end is connected to the cam assembly 120, and the other end is extrapolated to the piston rod 130 and the piston rod 130 on which the piston 132 is mounted. A bushing 140 to be in close contact with the partition 116 between the cam operating chamber 112 and the cylinder 114 to prevent leakage of the working fluid, and to be disposed between the piston 132 and the bushing 140. Extrapolated to the piston rod 130 includes a spring 150 to close the bushing 140 to the partition 116 while applying an elastic force to the piston 132.

In the floor hinge 100, the piston rod 130 reciprocates within the cam operating chamber 112 and the cylinder 114 by the cam 122 of the cam assembly 120 as the door is opened and closed. Accordingly, while the working fluid moves through the fluid passage formed in the casing 110, the pressure of the piston 132 moving by the elastic force of the spring 150 is buffered, so that the door closes slowly.

However, in the floor hinge 100, the inner wall of the cylinder 114 is worn out due to the friction between the cylinder 114 and the piston 132, thereby forming a gap between the cylinder 114 and the piston 132. The working fluid leaks through the gaps.

As a result, the floor hinge 100 has a disadvantage that the working fluid does not adequately buffer the piston 132 moving to its original position by the spring 150, and the door may not move at an appropriate speed.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, the object of the present invention is to provide a separate cylinder to keep the pressure of the working fluid at all times to open and close the door at a constant speed slowly To provide a floor hinge.

1 is an exploded perspective view of a floor hinge according to the prior art.

2 is a longitudinal sectional view of a floor hinge according to the prior art.

3 is a cross-sectional view of a floor hinge according to the prior art.

Figure 4 is an exploded perspective view of the floor hinge according to an embodiment of the present invention.

Figure 5a is a longitudinal sectional view of the floor hinge according to an embodiment of the present invention, showing the operating state of the door rotation control assembly with the door closed.

Figure 5b is a longitudinal sectional view of the floor hinge according to an embodiment of the present invention, showing the operating state of the door rotation control assembly in the open state.

6a to 6e is a view showing a cylinder applied to the floor hinge according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

200: floor hinge 210: door rotation control assembly

212: door rotation shaft 212c: cam

214: cylinder 215: filter network

216: piston rod 216a: piston

218: coil spring 220: lower casing

230: upper casing 240: packing member

In order to achieve the object of the present invention, the floor hinge according to the present invention comprises a door rotation control assembly for controlling the opening and closing of the door; A lower casing for receiving the door rotation control assembly; And an upper casing disposed above the lower casing to form a plurality of chambers together with the lower casing, the upper casing for sealing the lower casing, the plurality of chambers being in communication with each other, the working fluid Is charged.

A packing member is disposed between the upper casing and the lower casing to prevent leakage of the working fluid from the plurality of chambers. A rubber ring is used as the packing member.

The door rotation control assembly is disposed on one side of the chamber for receiving a portion of the working fluid filled in the chamber, disposed in the length direction in the plurality of chambers and linear reciprocating as the door opens and closes A piston rod for movement, a piston mounted at one end of the piston rod and disposed in the cylinder, a piston for reciprocating movement in the cylinder, extrapolated to the piston rod, one end supported by the lower casing and the other end It is supported by the piston and is rotatably supported by the coil spring for elastically pushing the piston rod and the piston, the upper and lower casing, the door is mounted on the other end, the cam is mounted on the middle And a door rotation shaft for linearly reciprocating the piston rod.

An annular groove formed on the outer circumference of one end side of the piston is equipped with an O-ring for preventing the working fluid from leaking from the cylinder.

The cylinder has an inflow passage through which the working fluid flows in, a outflow passage through which the working fluid flows out, and a bypass passage for adjusting the hydraulic pressure of the working fluid.

The inlet passage of the cylinder is provided with a filtering network for filtering foreign matter from the working fluid and a check valve for preventing the working fluid from flowing back out of the cylinder.

An elastic pin for adjusting the flow rate of the fluid flowing out of the cylinder is disposed in the outflow passage of the cylinder.

A hydraulic control device is disposed in the bypass passage, and the hydraulic control device includes an ear ball, a spring for elastically clamping the ear ball, and an adjustment screw for adjusting the elastic force of the spring.

One side of the upper casing is formed with a through hole through which the door rotation shaft of the door rotation assembly extends, the through hole is in close contact with the door rotation shaft to prevent the working fluid from leaking from the chamber O type sealing member is disposed.

The other side of the upper casing is provided with an oil supply hole for lubricating the working fluid while adjusting the amount of the working fluid flowing out of the outlet of the cylinder by rotating the elastic pin through the oil supply hole.

The floor hinge according to the present invention configured as described above can prevent the working fluid from leaking from the cylinder even when used for a long time. As a result, there is an advantage that the door can be opened and closed at a constant speed by maintaining a constant hydraulic force of the working fluid. In addition, by providing the casing divided into the upper and lower casing, there is an advantage that the maintenance, such as replacement of parts is easy.

The above objects and other advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.

Hereinafter, with reference to the accompanying drawings will be described in detail the floor hinge 200 according to an embodiment of the present invention.

4 is an exploded perspective view of the floor hinge 200 according to an embodiment of the present invention, Figures 5a and 5b is a longitudinal cross-sectional view of the floor hinge 200.

As shown in Figure 4 to 5b, the floor hinge 200 of the present invention, the door rotation control assembly 210 for controlling the opening and closing of the door, the lower cage for receiving the door rotation control assembly 210 Disposed on top of the y-shing 220 and the lower casing 220 to form a plurality of chambers 222, 223 together with the lower casing 220, for sealing the lower casing 220. Upper casing 230. The plurality of chambers 222 and 223 communicate with each other and are filled with a working fluid.

As can be seen from Figures 4 to 5b, a packing member 240, such as a rubber ring, is disposed between the upper casing 230 and the lower casing 220. The packing member 240 serves to prevent the working fluid from leaking from the plurality of chambers 222 and 223 defined by the upper casing 230 and the lower casing 220.

As shown in FIG. 4, a through hole 232 through which the door rotation shaft 212 of the door rotation assembly 210 extends is formed at one side of the upper casing 230, and the through hole 232. ) Is provided with an O-shaped sealing member 234 in close contact with the door rotation shaft 212 to prevent the working fluid from leaking from the chambers 222 and 223.

While supplying the working fluid to the other side of the upper casing 230 while rotating the elastic pin 214a mounted on the cylinder 214 of the door rotating assembly 210 by the outlet passage of the cylinder (214) ( An oil supply hole 236 for adjusting the amount of the working fluid flowing out from 214c is formed. A metal cap 238 is screwed into the oil supply hole 236 to prevent the working fluid from flowing out of the chambers 222 and 223.

A groove for accommodating the bearing 212a mounted on the other end of the door rotation shaft 212 is formed at an inner side surface of the upper casing 230, and around the groove, the upper casing 230 is provided. When coupled to the lower casing 220 guides the upper casing 230 to be accurately coupled to the lower casing 220 while the piston rod 216 of the door rotation assembly 210 is to reciprocate. An arc guide (not shown) for guiding the piston rod 216 is formed to face each other.

On the other hand, at the edge of the upper casing 230 and the lower casing 220, a plurality of screw holes and upper and lower casing 220, for coupling the upper casing 230 to the lower casing 220, In the state where the 230 is installed in the mounting groove of the building floor, a plurality of through-holes are formed to couple the screws for adjusting the height and the horizontality of the upper and lower casings 220 and 230. Further, the upper and lower casings 220 and 230 are firmly fixed to mounting grooves of the building floor at both ends of the upper casing 230, while the upper and lower casings 220 and 230 are moved in the longitudinal direction of the grooves. A plurality of threaded holes are formed for joining the screw for making.

A groove 224 is formed at one bottom of the lower casing 220 to accommodate a bearing 212b mounted at one end of the door rotation shaft 212, and a groove is formed at a periphery of the groove 224. A plurality of ribs (not shown) for supporting the 224 are arranged at predetermined intervals.

Meanwhile, a supporting protrusion 226 for supporting the cylinder 214 is formed at the other bottom surface of the lower casing 220. In addition, the lower casing 220, the projection line 228 is formed along the inner surface of the lower casing 220 at a position away from the other end in a predetermined distance, the projection line 228 Serves to prevent the cylinder 214 from moving in the chambers 222 and 223.

In addition, the lower casing 220 has a protrusion 229 for supporting one end of the coil spring 218 extrapolated to the piston rod 216 at a position away from the one end thereof by a predetermined distance to the other end side. ) Is formed.

The upper casing 230 and the lower casing 220 are manufactured by die casting a zinc alloy. Therefore, there is an advantage that can be manufactured more precisely than the casing produced by casting according to the prior art.

Referring again to FIGS. 4-5B, the door rotation control assembly 210 is disposed on one side of one of the chambers 222, 223 and filled with the working fluid filled in the chambers 222, 223. The cylinder 214 for receiving a portion, a piston rod 216 disposed longitudinally in the plurality of chambers 222 and 223 for linear reciprocating motion as the door (not shown) opens and closes, the A piston 216a mounted on one end of the piston rod 216 and disposed in the cylinder 214 and extrapolated to the piston rod 216 for reciprocating within the cylinder 214, and one end of the lower casing A coil spring 218 for supporting the piston rod 216 and the piston 216a elastically and supported by the piston 216a, the other end of which is supported by the piston 216a. 220, 230 is rotatably supported, and other It can be seen that the door is mounted at the end, and the cam 212c is mounted at the middle part to constitute a door rotation shaft 212 for linearly reciprocating the piston rod 216.

In the door rotation control assembly 210 applied to the floor hinge 200 according to the present invention, the piston rod 216 is formed against a pair of iron pieces, the butted iron piece is formed with a through hole at one end, the other end The sides are opposed at predetermined intervals. On the other end side of the piston rod 216, rectangular through holes of a predetermined length are formed, respectively, and the door rotating shaft 212 extends through the rectangular through holes.

In addition, on the other end side of the piston rod 216, a plurality of through holes are formed around the rectangular through hole, and each through hole includes a shaft 213a for supporting the cam guide rolls 212d, 212e, and 212f. 213b and 213c are pressed together.

The coil spring 218 is extrapolated to one end side of the piston rod 216. The coil spring 218 functions to return the piston rod 216 to the other side when the piston rod 216 is moved to one side by a cam 212c mounted to the door rotation shaft 212. .

The piston 216a is manufactured by die casting a zinc alloy. It is mounted on one end of the piston rod 216, and an annular groove is formed along the outer circumferential surface at a position adjacent to one end side. An annular groove of the piston 216a is equipped with an O-ring 216b for preventing the working fluid from leaking from the cylinder 214.

The door rotation shaft 212 extends through a rectangular through hole formed at the other end side of the piston rod 216, one end of which is supported by the lower casing 220 by a bearing 212b, and the other end side of The upper casing 230 is supported by a bearing 212a. On the other hand, the door rotating shaft 212 is equipped with a cam (212c) for moving the piston rod 216 to one side.

The cam 212c mounted to the door rotation shaft 212 is disposed to contact the cam guide rolls 212d, 212e, and 212f at the other end side of the piston rod 216, and as the door rotates, It serves to linearly reciprocate the piston rod 216.

The cam guide rolls 212d, 212e, and 212f rotate along the side of the cam 212c against the side of the cam 212c, and are rotated along the side of the cam 212c by the roll shafts 213a, 213b, and 213c. Is rotatably supported).

6a to 6e are views showing a cylinder 214 applied to the floor hinge 200 according to the present invention, Figure 6b is a cross-sectional view taken along the line AA 'of Figure 6a, Figure 6c is a B of Figure 6a 6B is a cross-sectional view taken along the line C-C 'of FIG. 6A, and FIG. 6E is a cross-sectional view taken along the line D-D' of FIG. 6A.

As illustrated in FIGS. 6A to 6E, the cylinder 214 may include an inflow passage 214b through which the working fluid flows in, a outflow passage 214c through which the working fluid flows out, and a hydraulic pressure of the working fluid. A bypass passage 214d for the purpose.

The inlet passage 214b of the cylinder 214 is provided with a filter net 215 for filtering foreign matter from the working fluid and a check valve 215a for preventing the working fluid from flowing back out of the cylinder 214 ( 6B and 6E).

In the outflow passage 214c of the cylinder 214, an elastic pin 214a for adjusting the flow rate of the fluid flowing out of the cylinder 214 is disposed (see FIGS. 6C and 6E).

The elastic pin 214a is formed of a cylindrical body portion and a circular head portion, and the body portion is cut in a T-shape. The elastic pin 214a is disposed perpendicularly to the outlet passage 214c at the distal end of the outlet passage 214c and in accordance with the pressure of the fluid flowing out of the cylinder 214 through the outlet passage 214c. Elastically bent Accordingly, when the piston 216a exerts pressure on the working fluid in the cylinder 214, the working fluid presses and clamps the main body of the elastic pin 214a and then the cylinder 214 through the outflow passage 214c. Spill out).

However, unlike the above, the flow passage 214c of the cylinder 214 may be provided with a flow rate adjustment screw (not shown) to adjust the flow rate of the working fluid in place of the elastic pin 214a. When the flow rate adjustment screw is installed, a screw groove communicating with the outlet passage 214c and the chambers 222 and 223 is formed, and the flow rate adjustment screw is coupled to the screw groove.

In this case, the bottom of the screw groove is in communication with the outlet passage 214c of the cylinder 214, the middle portion of the screw groove is formed to communicate with the chambers (222, 223). In addition, the screw groove forms a diameter of the opening larger than the diameter of the bottom portion. The flow rate adjustment screw is also formed to correspond to the screw groove, the distal end thereof is in close contact with the bottom of the screw groove to open and close the outflow passage 214c according to the amount of rotation of the screw.

A hydraulic pressure adjusting device 217 is disposed in the bypass passage 214d, and the hydraulic pressure adjusting device 217 includes the ear ball 217a, a spring 217b for elastically clamping the ear ball 217a, and And an adjusting screw 217c for adjusting the elastic force of the spring 217b (see FIGS. 6B, 6D, and 6E).

The hydraulic pressure adjusting device 217 is a pressure applied to the ear ball 217a by releasing the adjusting screw 217c when the amount of the working fluid flowing out through the outflow passage 214c is limited by the elastic pin 214a. Lowering is used to allow additional flow of working fluid through the bypass passage 214d.

Hereinafter, the operation relationship of the floor hinge 200 according to an embodiment of the present invention will be described in detail.

Floor hinge 200 according to the present invention configured as described above, the cam 212c is first mounted on the door rotation shaft 212, and then the upper and lower portions of the door rotation shaft 212 around the cam 212c The iron rod of the piston rod 216 is inserted to allow the door rotation shaft 212 to extend therethrough.

Subsequently, the cam guide rolls 212d, 212e, and 212f are disposed between the iron rods of the piston rod 212, and the cam guide rolls 212d, 212e, and 212f are rotated by the shafts 213a, 213b, and 213c. (216) It is rotatably fixed to the iron piece.

Thereafter, the coil spring 218 is extrapolated along the piston rod 216 from one end side of the piston rod 216, and then the piston 216a is fixed to one end of the piston rod 216. Subsequently, the O-ring 216b is attached to the annular groove formed on one end side of the piston 216a, and then the piston 216a is completely inserted into the cylinder 214.

The O-ring 216b mounted to the piston 216a functions to prevent the working fluid from leaking from the cylinder 214 when the piston 216a reciprocates in the cylinder 214.

As such, the door rotation control assembly 210 including the piston rod 216, the piston 216a, the coil spring 218, and the cylinder 214 is inserted into the lower casing 220. .

In this case, the bearing 212b mounted on the lower end of the door rotating shaft 212 is forcibly fitted into the groove 224 formed in the lower casing 220 so as to be fixed to the lower casing 220. The piston rod 216 and the coil spring 218 are disposed to support one end of the coil spring 218 on a protrusion 229 formed at an intermediate portion of the casing 220.

The cylinder 214 is also disposed between the protrusion line 228 formed at the other side of the lower casing 220 and the other end thereof, so that the piston rod 216 reciprocates by the protrusion line 228. Accordingly, the cylinders 214 do not move together.

As described above, after the door rotation control assembly 210 is mounted and disposed on the lower casing 220, the packing member 240 is disposed on the upper portion of the lower casing 220.

At this time, the through hole formed in the packing member 240 is disposed to match the screw hole formed in the lower casing (220).

Thereafter, the upper casing 230 is arranged such that the door rotating shaft 212 extends through the through hole 232 formed in the upper casing 230, and a bearing mounted at an upper end of the door rotating shaft 212. The outer ring of the bearing 212a is fixed to the upper casing 230 by forcing the 212a into a bearing mounting groove formed on the inner side of the upper casing 230.

At the same time, the edge of the upper casing 230 is arranged above the packing member 240 so as to coincide with the edge of the lower casing 220 and the packing member 240.

Thereafter, the upper casing 230 and the lower casing 220 are firmly coupled with screws. Subsequently, the working fluid is injected through the working fluid supply port 236 formed at the other end side of the upper casing 230, and the oil supply port 236 is blocked by the cap 238 to be oil-tight.

The floor hinge 200 according to the present invention assembled as described above is buried in the floor of the place where the door in the building is to be installed, and the position and height adjustment screw mounted on the edge and one end of the floor hinge 200 Adjust the height to fix it.

Subsequently, the watertight watertight member is covered on the upper casing 230 of the floor hinge 200 and the exterior cover is covered. Finally, a door mounting lot is installed on the floor hinge 200, and the door is coupled to the lot.

As described above, the floor hinge 200 coupled with the door, when the person opens the door, the door rotation shaft 212 is rotated in the direction of the door opening. Accordingly, the piston rod 216 is moved to one end side in the casings 220 and 230 by the cam 212c mounted to the door rotation shaft 212. Accordingly, the piston 216a moves in the cylinder 214 as shown in FIG. 5B, and the working fluid filled in the chambers 222 and 223 of the casings 220 and 230 is transferred to the cylinder 214. It is introduced into the cylinder 214 through the inflow passage 214b of the.

The working fluid in the chambers 222 and 223 passes through the filter net 215 disposed at the inlet passage 214b of the cylinder 214, and the foreign matter contained therein is filtered by the filter net 215. The working fluid passing through the filter net 215 is introduced into the cylinder 214 through the inflow passage 214b while pressing the ear ball 215a disposed in the inflow passage 214b.

On the other hand, when the working fluid flows into the cylinder 214, the working fluid also moves to the outlet passage 214c and the bypass passage 214d. However, since the working fluid pressurizes the elastic pin 214a blocking the outflow passage 214c and the ear ball 217a blocking the bypass passage 214d, the elastic pin 214a and the ear ball 217a. ) Respectively closes the inlet of the outlet passage 214c and the bypass passage 214d. Therefore, the working fluid does not flow into the cylinder 214 through the outflow passage 214c and the bypass passage 214d during the expansion stroke.

On the contrary, if a person opens the door and enters the building or outside the building and then puts the door in a free rotation state, since there is no force applied to the door, the piston rod 216 is caused by the elastic force of the coil spring 218. ) Moves in the casing 220, 230 toward the other end side of the casing 220, 230, ie toward the cylinder 214.

At this time, the piston 216a mounted at one end of the piston rod 216 moves into the cylinder 214 to pressurize the working fluid. Accordingly, the working fluid flows out through the outflow passage 214c, but the outflow velocity of the working fluid is slowed down by the elastic pin 214a blocking the outflow passage 214c.

Therefore, the working fluid in the cylinder 214 is compressed by the elastic pin 214a and the piston 216a, and the repulsive force moves the speed of the piston 216a moving into the cylinder 214. It will slow down. As a result, the movement speed of the piston rod 216 is also significantly lowered, and the rotation speed of the cam 212c mounted on the door rotation shaft 212 is lowered, so that the door mounted on the door rotation shaft 212 is also rotation speed. Will slow down. Therefore, the door rotation control assembly 210 adjusts the rotation speed of the door.

On the other hand, in order to increase the rotational speed of the door by adjusting the position of the elastic pin 214a of the cylinder 214 to increase the hydraulic force applied to the elastic pin 214a, the outflow passage of the cylinder 214 The amount of fluid flowing out through 214c may be increased. Accordingly, the compressive force applied to the working fluid in the cylinder 214 can be increased. As a result, the moving speed of the piston rod 216 is increased, and the door rotates at a high speed and closes.

On the contrary, in order to slow the rotation speed of the door, by adjusting the position of the elastic pin 214a of the cylinder 214 to reduce the hydraulic force applied to the elastic pin 214a, the outflow passage of the cylinder 214 The amount of fluid flowing out through 214c may be reduced. Accordingly, the compressive force applied to the working fluid in the cylinder 214 can be reduced. As a result, the moving speed of the piston rod 216 is slowed down, and the door rotates and closes at a slow speed.

In addition, by operating the hydraulic control device 217 mounted on the bypass passage 214d separately from the elastic pin 214a, the amount of working fluid flowing out of the cylinder 214 can be finely adjusted.

As described above, since the floor hinge according to the present invention is equipped with a separate hydraulic cylinder, it is possible not only to prevent the leakage of the working fluid, but also to keep the hydraulic pressure constant so that the working fluid can maintain the door at a constant speed. There is an advantage to open and close.

In addition, by dividing the casing into an upper casing and a lower casing to be detachable, there is an advantage in that maintenance such as replacement of parts is easy.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

Claims (23)

A door rotation control assembly for controlling the opening and closing of the door; A lower casing for receiving the door rotation control assembly; And Disposed on top of the lower casing to form a plurality of chambers with the lower casing, including an upper casing for sealing the lower casing, A floor hinge, characterized in that the plurality of chambers are filled with a working fluid, the plurality of chambers are in communication. The floor hinge of claim 1, further comprising a packing member disposed between the upper casing and the lower casing to prevent the working fluid from leaking from the plurality of chambers. 3. The floor hinge of claim 2 wherein said packing member is a rubber ring. The apparatus of claim 1, wherein the door rotation control assembly comprises: a cylinder disposed on one side of one of the chambers for receiving a portion of the working fluid filled in the chamber, the door rotationally disposed in the plurality of chambers in a longitudinal direction; Piston rod for linear reciprocating motion according to the opening and closing, a piston mounted to one end of the piston rod and disposed in the cylinder, and a piston for reciprocating in the cylinder, extrapolated to the piston rod, and one end to the lower casing Supported by the piston, the other end being rotatably supported by a coil spring for elastically pushing the piston rod and the piston, the upper and lower casings, the other end being equipped with a door, Part is equipped with a cam to rotate the door to linearly reciprocate the piston rod Floor hinge comprises a. 5. The method of claim 4, wherein the piston rod is formed by a pair of iron pieces, but the opposite iron piece is formed with a through hole at one end, the other end side is opposed to a predetermined interval, the other end of the iron piece a predetermined length Floor hinge, characterized in that each of the through holes are formed. The floor hinge according to claim 5, wherein a plurality of cam guide rolls are mounted on the other end side of the piston rod. 7. The door shaft of claim 6, wherein the door rotation shaft extends through a rectangular through hole formed at the other end side of the piston rod, one end of which is supported by the lower casing by a bearing, and the other end side is supported by the bearing. Floor hinge, characterized in that it is supported on the ear. The cam mounted on the door rotation shaft is disposed to contact the cam guide roll on the other end side of the piston rod, and the piston rod linearly reciprocates as the door rotates. Floor hinge. 7. The cam guide roll of claim 6, wherein the cam guide roll includes a roll that rotates along the side of the cam against the side of the cam and a roll shaft for rotatably supporting the roll to the piston rod. Floor hinge. The floor hinge according to claim 4, wherein the piston has an annular groove formed along an outer circumferential surface at a position adjacent to one end portion. The floor hinge according to claim 10, wherein the annular groove of the piston is provided with an O-ring for preventing the working fluid from leaking from the cylinder. 5. The floor hinge of claim 4, wherein the cylinder includes an inflow passage through which the working fluid flows in, a outflow passage through which the working fluid flows out, and a bypass passage for adjusting the hydraulic pressure of the working fluid. . 13. The floor hinge of claim 12, wherein the inlet passage of the cylinder is provided with a filtering network for filtering foreign matter from the working fluid and a check valve for preventing the working fluid from flowing out of the cylinder. The floor hinge according to claim 12, wherein an elastic pin for adjusting a flow rate of the fluid flowing out of the cylinder is disposed in the outflow passage of the cylinder. The floor hinge according to claim 14, wherein the elastic pin is formed of a cylindrical body portion and a circular head portion, and the body portion is cut in a T-shape. The floor according to claim 15, wherein the elastic pin is disposed perpendicularly to the outlet passage at the end of the outlet passage, and elastically curved according to the pressure of the fluid flowing out of the cylinder through the outlet passage. Hinge. 13. The hydraulic system of claim 12, wherein a hydraulic control device is disposed in the bypass passage, and the hydraulic control device includes an ear ball, a spring for elastically clamping the ear ball, and an adjustment screw for adjusting the elastic force of the spring. Floor hinge characterized in that. The floor hinge of claim 4, wherein a through hole is formed at one side of the upper casing to extend through the door rotation shaft of the door rotation assembly. 19. The floor hinge according to claim 18, wherein the through-hole formed in one side of the upper casing has an O-shaped sealing member disposed in close contact with the door rotation shaft to prevent leakage of the working fluid from the chamber. . 19. The method of claim 18, wherein the other side of the upper casing is for supplying the working fluid while rotating the elastic pin through the oil supply hole to adjust the amount of the working fluid flowing out of the outlet of the cylinder Floor hinge characterized in that the oil supply hole is formed. 19. The floor hinge according to claim 18, wherein a groove for accommodating a bearing mounted on the other end of the door rotation shaft is formed on an inner side surface of the upper casing. 5. The floor hinge of claim 4, wherein a groove for accommodating a bearing mounted at one end of the door rotation shaft is formed at one bottom surface of the lower casing. 23. The floor hinge according to claim 22, wherein the lower casing is provided with a protrusion for supporting one end of the coil spring that is extrapolated to the piston rod.