JPH0443571Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention opens the oil suction port into the cylinder at the tip of the piston in the main body of a hydraulic floor hinge at the lower part of the oil tank, which is equal to the height of the oil escape hole. An oil supply hole communicating with the suction port and an enlarged part with a ball valve interposed at the tip thereof are provided, and the enlarged part is communicated with the oil escape hole and the lower end of the flow rate adjustment valve insertion hole,
This invention relates to a thin floor hinge hydraulic system that extends the service life until air is sucked into the cylinder together with oil from the suction port even when the amount of oil in the oil tank decreases.

``Prior Art'' Conventionally, this type of floor hinge hydraulic system is shown in FIG. 4 (same as the sectional view taken along the line A--A in FIG. 1). There is one shown in FIG. 5 (similar to the sectional view taken along the line B--B in FIG. 1). This is an oil suction port 34 that supplies oil into the cylinder 3 at the tip of the piston 5.
is fixed with a piston pin 7 to the tip of the piston rod 6 connected to the cam of the floor hinge (both not shown), and communicates with the inside of the piston 5 at the tip of the piston 5, which slides inside the cylinder 3 and moves forward and backward. The oil suction port 3 is drilled in the center of the
A ball valve 30 is constructed by interposing a steel ball 29 at the enlarged end of the valve 4.

When the oil flow path is closed, the piston 5 moves forward in the cylinder 3 by the movement of a cam that is linked to the door mounting shaft of the floor hinge due to the elasticity of the spring 8, and the steel ball 29 of the ball valve 30 moves forward through the oil suction port. 34, and the oil at the tip of the piston 5 is drained into the lower inner surface of the cylinder 3 close to the side cover 4, which closes the tip of the cylinder 3, and the lateral protrusion 9 of the hydraulic floor hinge body 1. The lower end of the fitting hole 16 of the flow rate regulating valve 12 drilled from the upper surface of the protrusion 9 and the oil escape hole 1
7 into the fitting hole 16 below the flow rate control valve 12 through the gap between the small diameter taper hole 18 into which the tapered part 13 of the flow rate control valve 12 is fitted and which communicates with the flow rate control valve 12 . Oil is returned to the oil tank 2 through an oil return hole 10 that communicates with the drilled lower insertion hole 16 and is lowered on the side of the oil tank 2 that opens into the oil tank 2.

Furthermore, when opening the door, the piston 5 moves back inside the cylinder 3 against the elasticity of the spring 8.
The steel ball 29 of the ball valve 30 unblocks the oil suction port 34, and the oil in the cylinder 3 is supplied to the tip of the piston 5 from the oil suction port 34 at the center of the tip through the inside of the piston 5.

``The problem that the invention seeks to solve'' In recent years, as buildings have become taller, thinner floor hinges have been required. As a result, the thickness of oil tanks has become thinner, making it more difficult to replenish oil.

However, in this type of conventional floor hinge, the oil suction port 34 is provided in the center of the piston 5 as shown in FIG.
The position is considerably higher than the bottom surface, and when the oil in the hydraulic system gradually evaporates and decreases, if the oil tank is thick, there is a large amount of oil stored, so it is not a big problem, but if the oil tank becomes thin, the oil will easily evaporate. Moreover, it is not easy to replenish oil, and the hydraulic system cannot exert its full hydraulic action, causing the door to violently collide with the doorstop when closing. It has other major drawbacks.

In addition, as a method to prevent this kind of trouble caused by a decrease in oil storage to the maximum extent, there is a method such as Utility Model Publication No. 41-24064 related to the invention of the present applicant, but in this invention the piston is fixed to the outer frame, The cylinder into which the piston is inserted moves forward and backward based on the rotation of a cam fixed to the door mounting shaft.The structure is completely different from the original proposal, and it is also complicated. However, it has the disadvantage that it cannot be applied to architecture.

Even if the thickness of the oil tank is thin and it is difficult to replenish oil into the oil tank, the present invention does not require the oil suction port to be drilled in the center of the piston tip to supply oil into the cylinder at the tip of the piston. An oil suction port is opened on the inner surface of the oil tank of a protrusion formed on the cylinder side end of the floor hinge body, and the height is approximately equal to the oil escape hole below the conventional oil suction port 34, and the oil supply hole communicates with the oil suction port. To provide a thin floor hinge hydraulic device in which an enlarged part is formed at the tip, the enlarged part is communicated with the oil escape hole and the lower end of the flow rate adjustment valve fitting hole, and the service life is extended until air is sucked together with oil into the cylinder tip. The purpose is to

"Means for solving the problem" In order to achieve the above purpose, in this invention,
An oil supply hole 26 with an oil suction port 25 opened at approximately the same height as the conventional oil escape hole 17 is installed on the inner surface of the oil tank 2 of the protruding portion 9 protruding from the side end of the cylinder 3 of the conventional floor hinge main body 1. Provided below, the oil supply hole 2
6 is enlarged to form an enlarged part 27, the enlarged part 27 and the oil escape hole 17 are communicated through an opening 28, and the upper surface of the enlarged part 27 and the lower end of the fitting hole 16 of the conventional flow rate regulating valve 12 are connected. Tapered portion 13 of valve 12
A steel ball 29 constituting a ball valve 30 is interposed in the enlarged part 27 so that the steel ball 29 does not block the opening 28 with the oil escape hole 17. The stopper 31 with the pin 31a is attached to the enlarged part 27.
It was installed on.

"Function" A suction port 25 of the oil supply hole 26 to the tip of the cylinder 3 is opened at the lower part of the oil tank 2 of the protrusion 9 on the side of the cylinder 3 at the same height as the conventional oil escape hole 17. is enlarged to form an enlarged part 27, and an oil escape hole 1 is connected to the enlarged part 27 via a ball valve 30.
7, and communicated with the enlarged portion 27 through the small diameter taper hole 18 at the lower end of the fitting hole 16 of the flow rate adjustment valve 12, compared to the conventional one in which the oil suction port 34 was provided at the center of the tip of the piston 5. Suction port 25
are located below the oil tank 3, extending the service life until air is sucked together with the oil, and even if the floor hinge is made thin, the service life can be extended without replenishing oil during use.

``Example'' Now, the attached drawings showing an example of implementing the present invention will be explained in detail.

FIG. 1 shows the floor hinge of the present invention viewed from the plane, FIG. 2 is a cross-sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B--B in FIG.

Reference numeral 1 designates a known floor hinge body, in which a cam is pivotally supported at the base by a door mounting shaft, an oil tank 2 is formed inside the base and the middle, and a cylinder 3 is molded at the tip. It is closed with a side lid 4. A piston 5 is inserted into the cylinder 3 and slides therein. A piston pin 7 is pivotally supported at the tip of a piston rod 6 having a rectangular cross section connected to the tip of the support frame (not shown) of the cam. death,
A spring 8 interposed between the inner surface of the intermediate portion of the main body 1 and the piston 5 is used to always spring the door in the direction of closing the door (toward the tip of the main body 1). Reference numeral 9 denotes a protruding portion which is protruded from one side of the cylinder 3 portion of the floor hinge main body 1. Reference numeral 10 denotes a known oil return hole, which is bored between the tip of the floor hinge main body 1 of the protruding portion 9 and the oil tank 2 with a slope such that the oil tank 2 side is lowered as shown in FIG.
1. Reference numeral 12 designates a known flow control valve, which has a tapered portion 1 at its tip as shown in FIG.
3, a thread 14 is cut at the base, and a notch 15 for rotating the valve 12 is bored at the base end. Reference numeral 16 denotes a fitting hole for the flow rate adjustment valve 12, which is bored from the upper surface of the protruding portion 9 to reach the oil return hole 10, and the lower end of the fitting hole 16 is connected to the tapered portion 1.
3 is fitted into a small diameter taper part 18, one end of which is opened at the inner circumferential surface of the distal end close to the side cover 4 of the cylinder 3, and the other end is bored to reach the protruding part. They are connected by the small diameter tapered hole portion 18. 19 is a known O-ring holder,
A screw hole 20 into which the screw 14 at the proximal end of the flow control valve 12 is inserted is drilled on the inner surface, and a screw 22 is cut into the outer surface to fit into the screw hole 21 formed in the floor hinge main body 1. The tip is located in the middle of the control valve 12 and presses an O-ring 24 fitted into an O-ring fitting hole 23 having a larger diameter than the fitting hole 16 bored in the main body 1. 25
is a suction port, which is located on the oil tank 2 side at the base end of the oil supply hole 26, which is bored at almost the same height as the oil escape hole 17 and extends between the oil tank 2 below the oil return hole 10 of the protrusion 9 and the tip of the protrusion 9. This is an opening provided in the Reference numeral 27 denotes an enlarged part formed at the tip of the oil supply hole 26, which is connected to the other end of the oil escape hole 17 through an opening 28, and is connected to the other end of the oil escape hole 17 and the oil supply hole 26.
It communicates with A steel ball 29 is fitted into the enlarged portion 27 so as to close or open the tip of the oil supply hole 26, and constitutes a ball valve 30. 31 is a stopper for the steel ball 29, and a pin 31a having a smaller diameter than the enlarged part 27 that contacts the steel ball 29 is provided at the tip end.
, the proximal end is a large diameter part 31b that can be slidably inserted into the enlarged part 27, and an O-ring fitting groove 31c is bored around the large diameter part 31b. An O-ring 32 is inserted into the O-ring 31c, and the base end is closed with a lid 33 whose pressure amount can be adjusted freely, and the steel ball 29 is inserted into the oil escape hole 17 by the pin 31a at the tip.
This prevents the opening 28 from being blocked.
When using this, when the door is opened from the closed state as shown in Fig. 2, the piston 5 is moved back toward the proximal end by the piston rod 6 against the elasticity of the spring 8, and the tip of the piston 5 is depressurized. The inside of the enlarged part 27, which is communicated with the tip through the oil escape hole 17, is depressurized, the steel ball 29 unblocks the tip of the oil filler port 26, and the oil from the oil tank 2 flows into the suction port 25.
The oil is supplied to the tip of the cylinder 3 via the oil supply hole 26, the enlarged portion 27, and the oil escape hole 17. On the other hand, the tapered portion 13 of the flow rate adjustment valve 12
Although oil is also supplied through the oil return hole 10 from the gap between the small diameter taper hole 18 and the small diameter taper hole 18, more oil is supplied through the oil supply hole 26 due to the increase in pressure in the oil tank 2 due to the retraction of the piston 5. The steel ball 29 of the enlarged portion 27 continues to unblock the tip of the oil supply hole 26 and moves until it comes into contact with the tip of the piston 31a of the stopper 31, allowing the door to open without any trouble. At this time, the suction port 25 is opened at the bottom of the oil tank 2 at almost the same height as the oil escape hole 17, so it is located below the suction port 34 drilled in the center of the tip of the conventional piston 5, and the oil evaporates. Even if the amount decreases, air will not be easily sucked into the cylinder 3, and its service life can be extended.

Next, when closing the door, the piston 5 moves forward in the distal direction due to the elasticity of the spring 8, and the oil pressed by the piston 5 passes through the oil escape hole 17 to the oil supply hole 2.
However, due to the ball valve 30, the oil does not flow in the direction of the oil supply hole 26, and gradually passes through the oil return hole 10 from the gap between the tapered portion 13 of the flow rate adjustment valve 12 and the small diameter taper hole 18. oil tank 2
On the other hand, since air is not mixed into the oil as described above, the piston 5 also moves forward gradually and the door closes quietly.

``Effects of the invention'' With the structure described above, this invention can extend the service life of thin floor hinges, so even when used for doors in high-rise buildings, maintenance intervals can be extended, reducing maintenance costs. Significant savings can be made.

[Brief explanation of drawings]

The attached drawings show an example of the implementation of the present invention.
The figure is a plan view of the main part of the floor hinge of the present invention, Figure 2 is a cross-sectional view taken along line A-A in Figure 1, Figure 3 is a cross-sectional view taken along line B-B in Figure 1, and Figures 4 and 5 are a conventional floor hinge. FIG. 4 is a cross-sectional view taken along line A--A in FIG. 1, and FIG. 5 is a cross-sectional view taken along line B--B in FIG. 1... Floor hinge body, 2... Oil tank, 3...
...Cylinder, 4...Side cover, 5...Piston, 6
...Piston rod, 7...Piston pin, 8...
...Spring, 9...Protrusion, 10...Oil return hole,
11... Lid, 12... Flow rate adjustment valve, 13...
Tapered part, 14...Screw, 15...Rotation notch, 16...Flow rate adjustment valve insertion hole, 17...Oil escape hole, 18...Small diameter taper hole, 19...O-ring holder, 20, 21... ...screw hole, 22...screw,
23...O-ring insertion hole, 24...O-ring, 2
5...Suction port, 26...Oil supply hole, 27...Enlarged part, 28...Opening, 29...Steel ball,
30... Ball valve, 31... Stopper, 3
1a...Pin, 31b...Large diameter part, 31c...O
Ring insertion groove, 32...O-ring, 33...lid,
34...Oil suction port.

Claims (1)

[Scope of utility model registration request] A cam attached to a support frame of a floor hinge at the base is pivotally supported by a door mounting shaft, the interior from the base to the middle is an oil tank 2, and a piston 5 connected to a drawbar of the support frame by a piston rod 6 is installed at the tip. A cylinder 3 to be slidably inserted is molded, a spring 8 is interposed between the base and the piston 5 to press the piston 5 toward the tip of the cylinder 3, and the tip of the cylinder 3 is closed with a side cover 4. A protrusion 9 is formed on the side of the cylinder 3, and an oil escape hole 17 is formed below between the inner peripheral surface of the cylinder 3 and the protrusion 9 between the tip of the piston 5 when it moves forward and the side cover 4 that closes the tip of the cylinder 3. A fitting hole 16 into which the flow rate regulating valve 12 is fitted is bored from the upper surface of the protrusion 9, and a small diameter taper hole 18 into which the tapered part 13 of the flow rate regulating valve 12 is fitted is formed into the fitting hole 16. In the hydraulic floor hinge main body 1, the lower end of which communicates with an oil escape hole 17, and an oil return hole 10 that communicates with the insertion hole 16 is formed in the protruding portion 9 in an inclined shape such that the oil tank 2 side is lowered,
A suction port 25 is opened downward at the same height as the oil escape hole 17 at the tip of the oil tank 2, and an oil supply hole 26 for supplying oil to the cylinder 3 at the tip of the piston 5 is connected to the oil return hole 1.
0 below, and an enlarged part 27 is provided by enlarging the tip of the oil supply hole 26 to communicate with the small diameter tapered hole part 18 at the lower end of the fitting hole 16, and the enlarged part 27 and the oil escape hole 1 are connected to each other.
7 is provided, and a steel ball 29 is inserted and provided in the enlarged portion 27 to communicate with the ball 2.
A hydraulic system for a thin floor hinge, characterized in that a stopper 31 is provided with a protruding pin 31a to prevent the opening 28 from being blocked by the stopper 31.