JPH0410960B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a door closing speed switching device for a door closer, and in particular to a door closing speed switching device for a door closer in which the speed at the beginning and end of closing of the door can be set independently of each other. This invention relates to a door closing speed switching device.

[Conventional technology and problems]

The door closer has an oil damper, and by adjusting the opening degree of the orifice, the door closing speed can be adjusted. However, if the opening degree of the orifice is made small for the purpose of quietly closing the door, there is an inconvenience that the door closing speed becomes small even when the door begins to close, and the movement of the door becomes slow. On the other hand, for doors of rooms that need to be kept airtight, a latch bolt is applied after the outer edge of the door is made of elastic material attached to the door frame so as to surround the door opening. Therefore, it is necessary for the door closer of such a door to increase the closing speed at the end of closing and apply the latch bolt using the impact when the door collides with the packing strip. However, if the opening degree of the damper orifice is increased for this purpose, contrary to the above,
There is an inconvenience that the closing speed of the door becomes too high, which can be dangerous.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a door closing speed switching device for a door closer that can change the door closing speed during operation, thereby solving the above-mentioned disadvantages.

[Means for solving problems]

In order to achieve the above object, the present invention includes a cylindrical cylinder whose both ends are closed with cylinder caps and hydraulic oil is sealed inside, and which is slidably fitted into the cylinder and is linked to the opening and closing of the door. A stepped bushing hole with a large diameter front opening is formed in the front end of the piston that pressurizes the hydraulic oil during buffering, passing through the piston in the axial direction of the cylinder. A flanged cylindrical valve bushing is installed in this bushing hole in a freely movable manner, and an O-ring made of an elastic material is installed between the flange of the valve bushing and the stepped part of the bushing hole. A cylindrical adjustment valve tube is protruding from the inside of the opposing cylinder cap, and is slidably fitted to the valve bushing, and has a smaller inner diameter at the inner end and a step inside the inner hole. The inner end of the inner hole that communicates with the outside of the cylinder cap of the valve tube is fitted with the small diameter inner hole, and the small diameter portion extending into the large diameter inner hole is fitted with the outer end of the large diameter inner hole. A fitting irregular cross-section portion and a male threaded portion are arranged in series, a regulating valve whose outer end is exposed on the outer surface of the cylinder cap is fitted, and the male threaded portion is screwed with a male threaded portion formed on the cylinder cap or the regulating valve tube. On the other hand, a notch having approximately the same length as the valve bushing is formed along the generatrix in the outer circumferential surface of the regulating valve tube, and a first port is provided in the notch to allow the large-diameter inner hole to communicate with the cylinder internal space. At the same time, a second port for communicating the inner hole and the cylinder interior space with each other is opened in the part facing the irregular cross-section of the regulating valve, and a second port is opened on the outer circumferential surface of the inner end of the regulating valve on its generatrix. It is characterized by an orifice groove formed along the length.

〔Example〕

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

In FIG. 1, reference numeral 1 indicates a cylindrical cylinder, and a cylinder tube 2 is fitted into one end of the inner hole of the cylinder 1. As shown in FIG. Further, a cylinder cap 3 is screwed into the opening at one end of the cylinder 1, and the joint part of the cylinder cap 3 with the cylinder 1 is the third one.
10 It is liquid-tightly sealed by a ring 4. The opening at the other end of the cylinder 1, which is not shown, is similarly sealed with an O-ring.

Hydraulic oil is sealed in the cylinder 1, and a piston 5 is fitted to be slidable in the axial direction of the cylinder 1.

The piston 5 is biased to the left in FIG. 1 by torque springs 6, 6 as compression coil springs elastically mounted on the other end of the cylinder 1, and is biased in the longitudinal direction. Easy to follow teeth 7,7
are set up in a row. These rack teeth 7,7 are
A pinion shaft (not shown), which is engaged with a pinion gear 8 rotatably supported within the cylinder 1 and projects outside the cylinder through the cylinder 1, is connected to the door via a link mechanism (not shown). . Therefore, the piston 5 moves within the cylinder in conjunction with the opening and closing of the door. In the illustrated embodiment,
The door is configured to close as the piston 5 moves to the left.

Therefore, in the door opening speed switching device for a door closer according to the present invention, the piston 5 is placed inside the cylinder cap 3 facing the front end (the left end in FIG. 1) of the piston 5 that pressurizes the hydraulic fluid during buffering. A regulating valve tube 9 is provided to protrude and slidably fit into the front end of the valve.

The regulating valve tube 9 is a cylindrical body with a small inner diameter at the inner end, and in the illustrated embodiment, a stepped portion is formed approximately at the center of the inner hole in the length direction.
A female thread is formed at the outer end of the inner hole.
Then, the outer end of the cylinder cap 3 is fitted from the inside into a mounting hole 11 that is opened along the central axis of the cylinder cap 3 and passes through the cylinder cap 3, as shown in FIGS. An oil guide hole 1 that radially penetrates the inner end of the oil guide hole 1 and reaches the mounting hole 11.
2 (as shown in FIG. 2), and is locked by a split cylinder pin 14 whose inner end is fitted into a stepped second port 13 (FIG. 2), which will be described later, to secure the adjustment valve tube 9.
is integrally connected to the cylinder cap 3. In order to prevent the inner end of the split cylinder pin 14 from coming out of the second port 13, a steel ball 15 is driven into the outer end of the oil guide hole 12, and the opening of the oil guide hole 12 is 10 Ring 4 is covered.

In the illustrated embodiment, the cylinder cap 3 and the regulating valve tube 9 are arranged in consideration of ease of manufacture.
Although these are separate parts and integrally connected as described above, it goes without saying that these may be molded as a single part.

On the other hand, the outer circumference of the regulating valve tube 9 is slidably fitted to the front end of the piston 5. That is, the front end of the piston 5 has a stepped bush hole 16 which passes through the piston 5 in the axial direction of the cylinder and has a large diameter opening on the front side, that is, on the cylinder cap 3 side. A flanged cylindrical valve bushing 17 is loosely fitted into this bushing hole 16 via a 20th ring 18, and a connecting pin 19 driven into the front end of the piston 5 is inserted into a circumferential groove formed on the outer circumference of the valve bushing 17. By engaging with the valve bush 17, the valve bush 17 is integrally attached to the front end of the piston. The piston 5 has the regulating valve tube 9 fitted into the inner hole of the valve bush 17, and the valve bush 17 is allowed to tilt to a certain extent with respect to the axis of the cylinder 1.
The front end of the piston slides smoothly over the regulating valve tube 9 during its entire travel. Further, leakage of the pressurized hydraulic oil is prevented by the 20th ring 18 and the piston ring 21 wrapped around the front end of the outer circumference of the piston.

Furthermore, the above configuration allows the valve bush 17 to move slightly in the cylinder axis direction. Therefore, when the piston 5 moves to the right, the valve bush 17 moves to the left relative to the piston 5 due to the pressure of the hydraulic oil.
Since the seal by the ring 18 is released, the hydraulic oil in the cylinder space on the pinion gear 8 side passes through the gap between the outer peripheral surface of the valve bushing 17 and the inner hole of the bushing hole 16, and flows into the cylinder on the cylinder cap 3 side. Can move in space. However, this is not an essential component of the present invention, and it is of course possible to move the hydraulic oil with the movement of the piston 5 by providing a well-known ball valve at the front end of the piston 5. be. The portions of the rack teeth 7, 7 of the piston that interfere with the regulating valve tube 9 are notched, for example, in the shape of an arcuate groove.

On the other hand, the cylinder cap 3 of the regulating valve tube 9
As shown in FIG. 1, a regulating valve 22 is fitted into the inner hole communicating with the outside from the outside of the cylinder cap 3.

As shown in FIG. 3, this regulating valve 22 has an inner end fitted into the small diameter inner hole of the regulating valve tube 9,
Small diameter portion 2 extending into the large diameter inner hole (see Figure 1)
2a, an irregular cross-section portion 22b that fits into the outer end of the large diameter inner hole of the adjustment valve tube, and screws into the female threaded portion formed at the outer end of the inner hole of the adjustment valve tube (see Fig. 1). ) The male threaded portion 22c and the 30th threaded portion described later.
A groove part 22d for storing the ring is arranged in series,
As shown in FIGS. 3 and 4, on the outer end (left end in FIGS. 1 and 3) of the regulating valve 22,
A slot 22e is formed. Further, as shown in FIGS. 3 and 5, the inner end outer circumferential surface of the regulating valve 22 has a cross section V along its generatrix, which is deeper toward the inner end.
A letter-shaped orifice groove 22f is formed. Note that the irregular cross-section portion 2 of the regulating valve in the illustrated embodiment
2b has an oval cross-sectional shape as shown in FIG.

As shown in FIG. 1, the regulating valve 22 configured as described above has a 30th ring 23 in the groove 22d.
In the wrapped state, the inner end is fitted into the small diameter inner hole of the adjustment valve tube 9 near the stepped portion, and the male threaded portion 22c (Fig. 3) is connected to the female threaded portion at the outer end of the adjustment valve tube 9. They are screwed together and fitted into the inner hole. Note that the male threaded portion 22c is
A female thread may be formed on the cylinder cap 3 side and screwed onto the cylinder cap 3.

On the other hand, as shown in FIGS. 1 and 6, the outer peripheral surface of the regulating valve 9 has a notch 2 along its generatrix direction.
4 is formed. The notch 24 in the illustrated embodiment has a cross-sectional shape obtained by cutting out a part of a circle with a chord, and a flow path for hydraulic oil is formed between this notch 24 and the inner hole of the valve bush 17. If so, the cross-sectional shape of the notch 24 may be any shape.
Also, the dimension of the notch 24 in the length direction of the regulating valve tube 9 is approximately the same as the length of the fitting between the regulating valve tube 9 and the front end of the piston 5, that is, the length of the generatrix of the inner hole of the valve bushing 17. Or preferably longer. Furthermore, in FIG. 1, the notch 24 is depicted as extending from a portion of the regulating valve tube 9 having a large diameter inner hole to a portion having a small diameter inner hole, which is also a feature of the present invention. is not a required configuration requirement. As will be described later, the position of the piston 5 when the speed of the door closer is switched, that is, the opening angle of the door, is uniquely determined by the position of the outer end of the notch 24, and the timing of switching the speed of the door closer or the opening angle of the door is uniquely determined by the position of the outer end of the notch 24. Piston 5 when changing
This is because the position can be arbitrarily set depending on the formation position of the notch 24. However, the notch 24 must engage a portion of the regulating valve tube 9 that has a large diameter inner hole.

As shown in FIGS. 1 and 6, a first port 25 penetrating the pipe wall of the regulating valve tube 9 is provided in the notch 24 that hangs over the portion of the regulating valve tube 9 having the large diameter inner hole. is open, and the first port 25 connects the large-diameter inner hole of the regulating valve tube 9 through which the small-diameter portion 22a (FIG. 3) of the regulating valve 22 extends, and the cylinder inner space in which the piston 5 moves. are interconnected.

Further, as shown in FIGS. 2 and 6, the stepped second port 13 is opened in the wall of the regulating valve tube 9 in the portion facing the irregular cross-sectional portion 22b of the regulating valve 22. There is.

As shown in FIG. 1, a flange is integrally formed on the outer periphery of the inner end of the cylinder cap 3, and a circular recess, for example, is formed on the inner end surface of the cylinder cap 3. . A flow hole 26 leading to the oil guide hole 12 is opened at the bottom of this recessed portion. Further, a filter plate 27 having a snake's eye shape as a whole is fitted into the recessed part on the inner end surface of the cylinder cap 3, and furthermore, the filter plate 27 is fitted into the inner end flange of the cylinder cap 3. Filter cap 2 with many small holes to cover the
8 is caulked.

With the above configuration, the large-diameter inner hole of the regulating valve tube 9 that accommodates the irregular cross-section portion 22b of the regulating valve is connected to the second port 1 as shown in FIGS.
3. Through the slit 14a of the split cylinder pin (FIG. 2), the communication hole 26, the small holes of the filter plate 27 and filter cap 28, the piston 5 is communicated with the inner space of the cylinder in which it moves.

[Effect]

The door closing speed switching device for a door closer according to an embodiment of the present invention configured as described above utilizes the slot 22e (FIG. 4) of the regulating valve exposed at the outer end of the cylinder cap 3 to control the driver, etc. The speed is set by turning the regulating valve 22.

That is, since the regulating valve 22 is screwed onto the regulating valve tube 9 or the cylinder cap 3, the regulating valve 22 slightly moves in the length direction due to its rotation. Therefore, the relative position between the orifice groove 22f formed at the inner end of the regulating valve and the stepped portion of the inner hole of the regulating valve tube 9 changes, and the opening of the orifice groove 22f at the large diameter portion of the inner hole (as shown in the figure) changes. The size of the triangle (in the example) also varies. In other words, the orifice groove 22f
The opening of the first orifice formed between the inner bore step of the regulating valve tube 9 changes.

At the same time, as is clear from FIG. 2, since the irregular cross-section portion 22b of the regulating valve rotates within the regulating valve tube 9, the degree of opening of the second port 13 on the inner surface of the regulating valve tube can be changed. . The opening inside this second port 13 serves as a second orifice.

In the illustrated embodiment, the degree of opening of the second orifice cannot be set at an angular position where the outer circumferential cylindrical surface of the irregular cross-section portion 22b covers the inner opening of the second port 13, so the opening of the first orifice cannot be set. The degree cannot be set continuously in a strict sense. However, even in the illustrated embodiment, the first orifice can be finely adjusted by 1/2 lead of the male threaded portion 22c in terms of movement of the regulating valve.
By making the lead of the male thread portion small, it is possible to adjust the opening of the first orifice as necessary and sufficient for practical purposes. Further, if the cross section of the irregular cross section 22b is made substantially rectangular with cylindrical surfaces left at the corners, the opening of the first orifice can be set more finely. Note that since the rotation angle of the regulating valve required to set the opening degree of the second orifice is minute, the change in the opening degree of the first orifice when setting the opening degree of the second orifice can be ignored. . In other words, the opening degrees of the first and second orifices can be set independently of each other.

As described above, the first
In a door closer in which the opening degree of the second orifice is appropriately set, when the door begins to close, the front end of the piston 5 is fitted with the inner end of the regulating valve tube 9, as shown in FIG. to move to the left.

At this time, the hydraulic oil pressurized by the front end surface of the piston 5 flows exclusively through the annular flow path between the first port 25, the large-diameter inner hole of the regulating valve tube 9, and the small-diameter portion 22a of the regulating valve. , passes through the first orifice and the small-diameter inner hole of the regulating valve tube 9 to the pinion gear 8 side, and at this time, the piston 5 is buffered by the viscous resistance in the first orifice.

On the other hand, the filter plate 27, the flow path 26, the oil guide hole 1
2. Since the flow path leading to the inner hole of the regulating valve tube 9 via the second port 13 communicates with each other through the first port 25, there is no pressure difference before and after the second orifice, and the As a result, hydraulic oil does not flow to the second orifice.

As the piston 5 moves, as shown in FIG.
When the front end surface of the valve bush 17 reaches the outer end of the notch 24 of the regulating valve tube, the pressurized hydraulic oil cannot flow into the regulating valve tube 9 through the first port 25, so the filter plate 27, The oil passes through the flow hole 26 and the oil guide hole 12, passes through the second orifice, and flows into the inner hole of the regulating valve tube 9.

In the embodiment shown in FIG. 7, the length of the notch 24 is designed to be slightly shorter than that of the generatrix of the inner bore of the valve bush 17. Therefore, in the state shown in FIG.
Since the liquid cannot flow out of the regulating valve tube through the first orifice and the small diameter inner hole, the liquid flows to the pinion gear 8 side. In other words,
Hydraulic fluid will pass through the first and second orifices.

However, this is only a small distance of the total movement of the pinion, and when the piston 5 moves an inch, the inner end of the notch 24 touches the valve bush 1.
The large diameter inner hole of the regulating valve tube 9 and the cylinder inner space on the pinion gear 8 side are communicated with each other via the first port 25 and the notch 24 . Therefore, most of the hydraulic oil that has flowed into the regulating valve tube 9 through the second orifice as described above does not pass through the first orifice, which has a large flow resistance, but instead flows through the first port 25. It passes through the adjustment valve tube 9 and passes through the notch 24 to the pinion gear 8.
It flows into the inner space of the cylinder on the side. That is, the hydraulic oil mainly passes through the second orifice, and the piston 5 is damped by the viscous resistance of the second orifice. This continues until the piston 5 reaches the end of its travel stroke, as shown in FIG.

In other words, in the first half of the travel stroke of the piston 5, only the first orifice operates, there is a momentary transient state when the valve bush 17 covers the notch 24, and thereafter, the second orifice mainly operates. In other words, the speed of the door closer is changed. The speed switching position in the movement stroke of the piston 5 can be arbitrarily set by the formation position of the notch 24. Incidentally, if the length of the notch 24 is made longer than the generatrix of the inner hole of the valve bush 17, the above transient state will also disappear.

〔effect〕

As is clear from the above description, the present invention provides a cylinder cap that is slidably fitted to the front end of the piston, and has a stepped portion formed in the inner hole by reducing the diameter of the inner hole at the inner end. A cylindrical regulating valve tube is provided in a protruding manner, and an inner end of the regulating valve tube is fitted into a small diameter inner hole, and a small diameter portion and a large diameter inner hole are fitted into the inner hole of the regulating valve tube. A regulating valve is fitted in which an irregular cross-sectional part and a male thread part are connected to each other, and an orifice groove is formed on the outer circumferential surface of the inner end of the regulating valve,
A first orifice is provided near the stepped portion of the inner hole of the regulating valve tube, and a second port is provided in the regulating valve tube facing the irregular cross-section of the regulating valve to allow communication between the inner hole and the cylinder internal space. A second orifice is provided here so that the degree of opening in the inner hole of the regulating valve tube of the second port can be adjusted by rotating the irregular cross-section of the regulating valve, and on the other hand, the outer circumferential surface of the regulating valve tube is opened. A notch is formed along the generatrix to serve as a flow path for the hydraulic oil, and in this notch,
A first port that communicates with each other the large-diameter inner hole of the regulating valve tube and the cylinder internal space is opened, and during the piston movement portion where the front end of the piston does not block this first port, the second port is opened. The front and rear of the orifice are communicated with each other through a first port, and pressurized hydraulic oil is passed through the first port to the first port.
After the front end of the piston closes the first port and the pressurized hydraulic oil is passed through the second orifice,
Since the flow is returned from the inner hole of the regulating valve tube to the cylinder interior space through the first port, the two orifices can be operated selectively and independently depending on the position of the piston, and therefore the speed of the door closer can be controlled. can be switched depending on the purpose of the door.

Furthermore, since the device of the present invention is provided near the axis of the cylinder, it can be incorporated into the door closer without increasing its size, and has various other effects.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a main part of a door closer speed switching device according to an embodiment of the present invention, showing the state at the beginning of closing the door, FIG. 2 is an enlarged cross-sectional view taken along the line of FIG. 1, and FIG. 4 is a plan view of the regulating valve, FIG. 4 is an outer end view thereof, FIG. 5 is a cross-sectional view taken along the line of FIG. 3, FIG. 6 is a plan view of the regulating valve tube, and FIGS. FIG. 1 is a vertical sectional view similar to FIG. 1, showing the door in the middle of closing and the fully closed state, respectively. 1...Cylinder, 3...Cylinder cap, 5
...Piston, 9...Adjusting valve tube, 12...
Oil guide hole, 13...Second port, 16...Bushing hole, 17...Valve bush, 18...O ring, 22...Adjusting valve, 22a...Small diameter part, 22b
...Unusual cross-section part, 22c...Male thread part, 22f...
...Orifice groove, 24...Notch, 25...First port.

Claims (1)

[Claims] 1. A cylindrical cylinder whose both ends are closed with cylinder caps and hydraulic oil is sealed inside, and which is slidably fitted into the cylinder and moves inside the cylinder in conjunction with opening and closing of the door. In the case where the piston has a movable piston, a stepped bush hole is formed in the front end of the piston that pressurizes the hydraulic fluid at the time of buffering, passing through the piston in the axial direction of the cylinder and having a large diameter opening at the front. A flanged cylindrical valve bushing is movably mounted in the hole, and an O-ring made of an elastic material is fitted between the flange of the valve bushing and the step of the bushing hole, while a cylinder cap facing the front end of the piston is fitted. A cylindrical regulating valve tube that slidably fits into the valve bushing and has a smaller inner diameter at the inner end and a step inside the inner hole is protruded from the inner side, and the cylinder of this regulating valve tube The inner end of the inner hole that communicates with the outside of the cap has an irregular cross section that fits into the small diameter inner hole, a small diameter portion extending into the large diameter inner hole, and an outer end of the large diameter inner hole. and a male threaded part are arranged in series, and a regulating valve whose outer end is exposed on the outer surface of the cylinder cap is fitted, and the male threaded part is screwed into a female threaded part formed in the cylinder cap or the regulating valve tube, and the above-mentioned A notch having approximately the same length as the valve bushing is formed on the outer circumferential surface of the regulating valve tube along its generatrix, and a first port is opened in this notch to allow communication between the large-diameter inner hole and the cylinder internal space. , opening a second port that communicates the inner hole and the cylinder interior space with each other in a portion facing the irregular cross-section of the regulating valve;
Further, a door closing speed switching device for a door closer is characterized in that an orifice groove is formed on the outer circumferential surface of the inner end of the regulating valve along its generatrix. 2. The door closing speed switching device for a door closer according to claim 1, wherein the cross section of the irregular cross section of the regulating valve is oval shaped. 3. The door closing speed switching device for a door closer according to claim 1, wherein the cross section of the irregular cross section of the regulating valve is approximately rectangular with a portion of a cylindrical surface remaining at the corner. 4. The door closing speed switching device for a door closer according to any one of claims 1 to 3, wherein the orifice groove is a V-shaped groove in cross section that is deeper toward the inner end.