JP2969277B2 - Door closer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] The present invention relates to a door closer, and more particularly to a door closer capable of removing an adverse effect of air mixed with hydraulic oil in a cylinder.

[Conventional technology]

Usually, the door closer is, for example, as shown in FIG.
A cylinder 2 having one end closed by a high pressure side cylinder cap 1 and the other end closed by a low pressure side cylinder cap (not shown) in a liquid-tight manner, and filled with hydraulic oil inside.
A piston 3 fitted in the cylinder 2 so as to be movable in the cylinder axis direction (the left-right direction in FIG. 1) and urged in the direction toward the high-pressure side cylinder cap 1 by the elastic force of a closer spring (not shown). A pinion shaft 4 having a relational angle perpendicular to the cylinder axis and rotatably supported at a central portion of the cylinder 1, at least one end of which is projected outside the cylinder 2, and a cylinder 2 of the pinion shaft 4. And a pinion 6 meshed with a rack 5 formed integrally with the piston 3.

With the above configuration, when the door is closed, the piston 3 is pushed leftward in FIG.
The elasticity of the closer spring is applied to the hydraulic oil in the high-pressure space 7 between the front end (left end in FIG. 1) of the piston 3 and the high-pressure side cylinder cap 1, and this hydraulic oil is used for the return hole and the orifice described below. In the process of moving to the low-pressure space through the piston, the movement of the piston 3 is buffered, and the rotation of the pinion shaft 4 that meshes with and engages with the piston 3 moves the link mechanism, which usually includes a main arm and a fork arm, to loosen the door. Close to.

By the way, some door closers change the degree of buffering during the closing of the door, so that the door can be closed swiftly at the beginning of closing, and the speed can be changed midway, and the door can be closed gently during a certain angle section before closing. It is configured.

Therefore, as shown in FIGS. 2 to 4, for example, the door closer has first and second return holes 9, 11 in which orifices 8 are inserted in parallel with the inner hole of the cylinder 2, respectively.
And the opening positions of the inlet and outlet of each return hole 9 (11) are different from each other in the cylinder axis direction,
The recirculation holes 9, 11 are switched by the movement of.
For example, at the beginning of closing the door, as shown in FIG. 3, the outlet of the second return hole 11 is closed by the piston 3, so that high-pressure hydraulic oil passes through the first return hole 9 from the high-pressure space 7. When the piston 3 flows into the low-pressure space 12 and approaches the cylinder cap 1 on the high-pressure side, the inlet of the first return hole 9 is closed by the piston 3 and the second return hole 11 is opened as shown in FIG. In this way, the recirculation holes 9, 11 are switched by the movement of the piston 3, and the shift of the door is performed.

As shown in FIG. 1, a communication hole 13 that penetrates the piston 3 in the cylinder axial direction is opened at the front end of the piston 3, and an end of the communication hole 13 on the high-pressure space 7 side has The annular opening edge of the communication hole 13 is used as a valve seat, and a check ring 15 having a spherical valve element 14 is provided. In FIG. 1, reference numeral 16 denotes a pin for preventing the valve body 14 from falling off, reference numeral 17 denotes a filter,
Reference numeral 18 denotes a retaining ball pushed into the filter housing hole for preventing the filter 17 from coming off.

[Problems to be solved by the invention]

However, in a consumer hydraulic device such as the door closer described above, in order to absorb the expansion of hydraulic oil due to a rise in temperature and to prevent oil leakage, and to simplify the structure of the device, the hydraulic device is installed in the cylinder 2. Air having a volume ratio of several percent is sealed together with the oil, and when the temperature rises, the expansion of the working oil is absorbed by the compression of the air. This air will, of course, be localized above the horizontal bore of the cylinder 2.

Therefore, when the door is opened, that is, when the piston 3 moves to the right in FIG. 3, the air above the cylinder 2 flows through the first return hole 9 in the direction opposite to the arrow, and flows into the high-pressure space. This is because the hydraulic oil in the low-pressure space 12 should normally move to the high-pressure space 7 through the communication hole 13 (FIG. 1). This is because the viscous resistance when passing through is smaller. This is especially true when the filter 17 is provided in the communication hole 13.

As described above, if air is mixed into the hydraulic oil in the high-pressure space 7, the air is compressed first when the door is closed, or the air passes through the orifice, so that the buffer function of the door closer is lost unless all the air moves to the low-pressure space. Will be Therefore, opening the door a little and releasing it is dangerous because the damper does not work at all and the door closes suddenly, or when entering the room with the door wide open, the ass is hit by the sudden rotation of the door that starts to close. Or various inconveniences such as unpleasant noise due to cavitation when air passes through the orifice 8.

If the first and second return holes 9 and 11 are both arranged below the cylinder 2, the above-mentioned inconvenience should not occur. However, the door closer is normally turned upside down or left or right in accordance with the opening of the door. At this time, the first and second recirculation holes 9 and 11 are both located at an upper position, which is not good. The same applies to a door closer having only one return hole.

An object of the present invention is to provide a door closer in which air does not flow into a high-pressure space when the door is opened, and to solve the above-mentioned disadvantages.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a cylinder, which is closed at both ends with cylinder caps and is filled with hydraulic oil inside, and is fitted in an inner hole of the cylinder so as to be movable in an axial direction thereof, and is provided with a spring. A piston that is urged in one direction and that forms a rack along the cylinder axis direction, and is rotatably supported by the cylinder while maintaining a perpendicular angle to the cylinder axis, and at least one end protrudes out of the cylinder. A pinion shaft formed by engaging a pinion formed in a portion inside the cylinder with a rack of the piston, and a high-pressure space in front of the piston formed in parallel with the inner hole of the cylinder and having a high pressure due to the movement of the piston when the door is closed, and Having an orifice inserted in a return hole communicating the low-pressure space opposite to the high-pressure space with respect to the piston. Characterized in that a one-way valve that allows only the flow of hydraulic fluid to the low pressure space from the pressure space to the reflux bore.

(Operation)

In the door closer according to the present invention configured as described above, when the door is opened, the piston moves in a direction to increase the volume of the high-pressure space while compressing the closer spring as a compression coil spring in the cylinder. At this time,
The hydraulic oil and air in the low-pressure space are pressurized by the piston, flow into the return hole from the outlet of the return hole, and try to escape into the high-pressure space through the orifice. A directional valve blocks that flow. In other words, when opening the door, the return hole is closed.

Therefore, the hydraulic oil in the low-pressure space flows into the high-pressure space only through the communication hole opened to the piston. Since the communication hole is below the hydraulic oil level in the cylinder, air does not flow into the pneumatic space.

When you open the door and release your hand, due to the elasticity of the closer spring,
The piston moves in a direction that reduces the volume of the high pressure space,
The check valve closes and the elasticity of the closer spring is applied to the hydraulic oil in the high-pressure space. The hydraulic oil loaded with this elasticity
The liquid flows into the low-pressure space through the return hole, and receives viscous resistance from the orifice in the process, so that the piston is cushioned as in a conventional door closer. This is because the one-way valve provided in the return hole allows the flow of hydraulic oil from the high-pressure space to the low-pressure space.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

First, the general configuration of the orifice forming portion of the door closer will be described with reference to FIG.

In FIG. 4, reference numerals 9 and 11 indicate reflux holes.
Reference numerals 9 and 11 denote stepped holes, one ends of which are open to the cylinder end faces, which are formed in parallel with and parallel to the inner hole of the cylinder 2. A speed adjusting rod 19 is inserted into each of the return holes 9 (11) from an opening in the cylinder end face, and is screwed in a liquid-tight manner. That is, the speed adjusting rod 19 includes, in order from the outside, a slipper forming portion 19a, an O-ring support portion 19b, a male screw portion 19c,
A main body portion 19d extending to the large diameter portion of the return hole, and a valve body portion 19e having a distal end fitted to the small diameter portion of the return hole are formed, respectively, and O is fitted to the O-ring support portion 19b. -The ring 21 prevents hydraulic oil from leaking and the male thread 19
c is screwed into a female screw portion formed in the return hole.

On the other hand, an orifice groove 22 that is wider toward the distal end is formed on the outer peripheral surface of the distal end portion of the valve body portion 19e along the generatrix. The orifice groove 22 in the illustrated embodiment is a V-shaped cross section that becomes deeper toward the tip. And orifice 8
Is a triangular opening facing the large-diameter portion of the return hole of the orifice groove 22. With the above-described configuration, the valve body is formed by turning the sleeve (see FIG. 2) of the sleeve portion 19a exposed on the cylinder end face with a screwdriver or the like. By adjusting the fitting depth of the portion 19e, the viscous resistance exerted by the orifice 8 can be adjusted.

In the door closer according to the present invention, in addition to the configuration of the above-described conventional door closer, a one-way valve that allows only the flow of the hydraulic oil from the high-pressure space to the low-pressure space is provided in the return hole 9 (11).

In FIG. 5 showing the first embodiment of the present invention,
Denotes a flexible disk made of a material such as rubber. The disk 23 is fixed by, for example, a grooved fixing pin 24 integrally projecting from the front end face of the valve body 19e of the speed adjusting rod 19e.
It is attached to the front end face. Specifically, the fixing hole 24 is passed through the fixing pin 24 so as to expand a small hole opened at the center of the disk 23, and fitted into a groove formed at the base of the fixing pin. The outer diameter of the disc 23 is set to be substantially equal to the inner diameter of the small diameter portion of the return hole in which the valve body 19e is fitted.

In the door closer according to the fifth embodiment shown in FIG. 5, when the door is closed, the hydraulic oil flows from left to right in FIG. Is elastically deformed in a direction away from the end surface of the valve body 19e, and does not hinder the flow of the hydraulic oil. In this case, although the resistance of the orifice slightly increases due to the presence of the disc 23,
This increase can be easily corrected by adjusting the opening degree of the orifice to be relatively large.

On the other hand, when the door is opened, the hydraulic oil tends to flow from right to left in FIG. 5, but due to the pressure of the hydraulic oil, the disc is elastically pressed so as to stick to the end face of the valve body portion 19e, and The opening of the opened V-shaped orifice groove 22 is closed. Therefore, neither hydraulic oil nor air flows into the high-pressure space.

FIG. 6 shows another embodiment of the present invention,
A ball check valve is provided in the small diameter portion of the return hole. The ball check valve in the illustrated embodiment includes:
For example, a cup-shaped valve cylinder 25 having a small hole opened in the bottom face is press-fitted into a small-diameter portion of the return hole, and a ball 26 housed in the valve cylinder 25 is inserted.
In order not to escape, a part of the cylindrical portion of the valve cylinder 25 is cut and raised inward. Alternatively, as shown in FIG. 7, the ball 26 may be restrained in the valve cylinder 25 by a pin 27 penetrating the opening of the valve cylinder 25 in the radial direction.

The one-way valve configured as described above constitutes a so-called ball check valve in which the opening edge at the bottom surface of the valve cylinder 25 is a valve seat and the ball 26 is a valve body, and the function of the ball check valve is known. Therefore, the description is omitted.

FIG. 8 shows another embodiment of the present invention,
A flexible annular plate 28 having an outer diameter larger than the inner diameter of the large diameter portion of the return hole 9 (11) is fitted into a groove formed between the main body portion 19d of the speed adjusting rod and the valve body portion 19e. It is the one that was attached. At this time, the annular plate 28 is mounted so that the outer peripheral edge portion is elastically deformed toward the orifice groove 22.

In the door closer according to the embodiment shown in FIG. 8 constructed as described above, when the door is closed, the hydraulic oil flows from left to right in FIG. 8, and in response to the flow of the hydraulic oil, the outer peripheral edge of the annular plate 28 has a return hole. It is elastically deformed so as to be peeled off from the inner wall of the motor and allows the passage of hydraulic oil. However, due to the flow of hydraulic oil from right to left in FIG. 8 when the door is opened, the outer peripheral edge of the annular plate 28 is strongly elastically contacted with the inner wall of the large diameter portion of the return hole, and as a result, the return hole 9 (11) is formed. Closed. Therefore, the air does not flow into the high-pressure space of the cylinder when the door is opened.

〔The invention's effect〕

As is apparent from the above description, in the present invention, a one-way valve is provided in the return hole having the orifice, and when the door is opened, the air tends to flow backward from the low-pressure space of the cylinder to the high-pressure space through the return hole. Since the flow of the working oil is prevented in the return hole, the inconvenience such as the temporary loss of the buffer function of the door closer or the occurrence of cavitation caused when air flows into the high-pressure space can be finally eliminated.

Further, the present invention has various effects, such as a simple configuration, high reliability, and expectation that a desired function can be maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a sectional view for explaining an example of a general structure of a door closer, FIG. 2 is a schematic end view of the door closer, and FIGS. 3 and 4 show an example of a door closer having a shifting function. 2 is a diagrammatic sectional view taken along line III, IV-III, IV, FIG. 5 is an enlarged sectional view of an orifice portion of a door closer according to an embodiment of the present invention, and FIGS. 6 to 8 are present invention. FIG. 12 is an enlarged sectional view similar to FIG. 5 showing another embodiment of the present invention;
FIG. 7 shows only the ball check valve. DESCRIPTION OF SYMBOLS 1 ... Cylinder cap, 2 ... Cylinder, 3 ... Piston, 4 ... Pinion shaft, 5 ... Rack, 6 ... Pinion, 7 ... High pressure space, 8 ... Orifice, 9,11 ... Return hole , 12… Low pressure space, 19… Speed adjustment rod, 22… Orifice groove, 23… Disc, 25… Valve cylinder, 26… Ball, 28…
… An annular plate.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E05F 3/02-3/12 F16F 9/32-9/40

Claims (3)

(57) [Claims] 1. A cylinder whose both ends are closed by a cylinder cap and which is filled with hydraulic oil inside, is fitted in an inner hole of the cylinder so as to be movable in the axial direction, and is urged in one direction by a spring. Along with the piston, which forms a rack along the cylinder axis direction, is rotatably supported by the cylinder while maintaining a relation angle perpendicular to the cylinder axis, and at least one end is projected outside the cylinder.
A pinion shaft formed by engaging a pinion formed in a portion inside the cylinder with a piston rack, a high-pressure space formed in parallel with the above-mentioned cylinder bore, and having a high pressure in front of the piston, which has a high pressure due to the movement of the piston when the door is closed; The orifice inserted in the return hole communicating the low-pressure space on the opposite side to the space and a small amount of air sealed in the low-pressure space. The orifice groove is formed along the generatrix on the outer peripheral surface of the distal end portion of the speed adjusting rod having the distal end portion fitted to the small diameter portion and extending toward the small diameter portion. In addition, in order to prevent air from moving from the low-pressure space to the high-pressure space, a flexible disk having an outer diameter substantially equal to the inner diameter of the small diameter portion of the return hole is attached to the front end surface of the speed adjusting rod. Door closer characterized in that a one-way valve. 2. A cylinder whose both ends are closed by a cylinder cap and which is filled with hydraulic oil inside, is fitted in an inner hole of the cylinder so as to be movable in the axial direction thereof, and is urged in one direction by a spring. Along with the piston, which forms a rack along the cylinder axis direction, is rotatably supported by the cylinder while maintaining a relation angle perpendicular to the cylinder axis, and at least one end is projected outside the cylinder.
A pinion shaft formed by engaging a pinion formed in a portion inside the cylinder with a piston rack, a high-pressure space formed in parallel with the above-mentioned cylinder bore, and having a high pressure in front of the piston, which has a high pressure due to the movement of the piston when the door is closed; The orifice inserted in the return hole communicating the low-pressure space on the opposite side to the space and a small amount of air sealed in the low-pressure space. The orifice groove is formed along the generatrix on the outer peripheral surface of the distal end portion of the speed adjusting rod having the distal end portion fitted to the small diameter portion and extending toward the small diameter portion. And a ball check valve having an annular valve seat formed in the small diameter portion of the return hole and a spherical valve element in order to prevent the movement of air from the low pressure space to the high pressure space. Doaroza characterized in that a directional valve. 3. A cylinder whose both ends are closed by a cylinder cap and which is filled with hydraulic oil inside, is fitted in an inner hole of the cylinder so as to be movable in the axial direction, and is urged in one direction by a spring. Along with the piston, which forms a rack along the cylinder axis direction, is rotatably supported by the cylinder while maintaining a relation angle perpendicular to the cylinder axis, and at least one end is projected outside the cylinder.
A pinion shaft formed by engaging a pinion formed in a portion inside the cylinder with a piston rack, a high-pressure space formed in parallel with the above-mentioned cylinder bore, and having a high pressure in front of the piston, which has a high pressure due to the movement of the piston when the door is closed; The orifice inserted in the return hole communicating the low-pressure space on the opposite side to the space and a small amount of air sealed in the low-pressure space. The orifice groove is formed along the generatrix on the outer peripheral surface of the distal end portion of the speed adjusting rod having the distal end portion fitted to the small diameter portion and extending toward the small diameter portion. At the same time, in order to prevent the movement of air from the low pressure space to the high pressure space, it is mounted so as to surround the adjusting rod in the large diameter portion of the return hole, and has an outer diameter larger than the inner diameter of the large diameter portion of the return hole. Door closer characterized in that a one-way valve made of FLEXIBLE annular plate.