JPH0260835B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a so-called back-check device for a door closer that applies braking to a door when the door is opened, and in particular,
This invention relates to a back check device for a door closer that can arbitrarily adjust the angular position of the door when braking starts to be applied to the door.

[Conventional technology and problems]

Door closers usually have an oil damper,
When the door is closed, this oil damper is activated to dampen the rotation of the door in the closing direction, but when the door is opened, it only stores energy in the torque spring built into the door closer; Oil damper does not operate.

However, due to space constraints at the location where the door is installed, for example, if the opening angle of the door exceeds 90 degrees, the knob may hit the wall, or due to the arrangement of furniture etc. in the room, if the door is opened beyond a certain angle. Doors and knobs may collide with these pieces of furniture.

In such cases, opening the door suddenly may damage walls, furniture, knobs, etc., so high-quality door closers are equipped with a braking means called a back-check device, which prevents the door from opening. A time brake is applied to prevent the door from opening suddenly.

Specifically, another oil damper that operates when the door is opened is installed in the cylinder of the door closer, and when the opening angle of the door exceeds a certain value, the other oil damper is activated. .

However, in conventional back-check devices with such a configuration, the angular position of the door at which the brake starts is fixed, so in some cases, the brake is applied after the knob or the like collides with an obstacle such as a wall or furniture, causing the back-check device to fail. The disadvantage is that it cannot perform its functions.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a door closer back check device that can arbitrarily set the angular position of the door at which the brake starts to be applied when the door is opened, thereby solving the disadvantages of the conventional back check devices described above.

[Means for solving problems]

In order to achieve the above object, the present invention includes a 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 moved in conjunction with the opening and closing of the door. A back check rod with an irregular cross section that extends parallel to the axis of the cylinder inside the cylinder cap on the side where the piston approaches when the door rotates in the opening direction. The outer end of the back check rod is fitted into the cylinder cap liquid-tightly and rotatably, and the outer end surface of the back check rod is exposed to the outside. At the end of the piston facing the rod, an orifice groove is formed along the generatrix of the outer circumferential surface, and a cylindrical back check valve has an inner hole with an irregular cross section that slidably fits into the back check rod. , is screwed coaxially with the back check valve, and on the other hand, a notch is provided at the inner end of the back check rod along its generatrix to form a flow path for hydraulic oil between it and the inner hole of the back check valve. It is characterized by having been established.

〔Example〕

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

In FIG. 1, reference numeral 1 indicates a cylindrical cylinder. A cylinder cap 2 is screwed into the opening at one end (the right end in FIG. 1) of this cylinder 1, and the joint part of this cylinder cap 2 with the cylinder 1 is It is liquid-tightly sealed by the tenth ring 3. The other end opening of the cylinder 1 (not shown) is similarly sealed with a cylinder cap and an O-ring.

Hydraulic oil is sealed in the cylinder 1, and a piston 4 is fitted to be slidable in the axial direction of the cylinder 1.

The piston 4 is biased to the left in FIG. 1 by torque springs 5, 5, which are doubly elastic compression coil springs in the cylinder 1, and is biased toward the left in the longitudinal direction. Rack teeth 6, 6 are arranged in rows along the line. These easy teeth 6,
6 meshes with a pinion gear 7 that is rotatably supported within the cylinder 1, and a pinion shaft 8 that penetrates the cylinder 1 and projects outside the cylinder.
It is connected to the door via a link mechanism (not shown). Therefore, the piston 4 moves within the cylinder in conjunction with the opening and closing of the door. In the illustrated embodiment, the door is configured to close when the piston 4 is pushed leftward by the elasticity of the torque springs 5, 5. Note that, when the piston 4 moves to the left in FIG. 1, the other end of the cylinder 1 (not shown) receives hydraulic oil pressurized by the left end of the piston (also not shown), which is connected to a pinion gear. A flow path is formed in the inner space of the cylinder on the 7 side.
Since it is the same as a normal door closer that uses the viscous resistance when the hydraulic oil passes through the orifice inserted in this flow path to cushion the door as it rotates in the door closing direction, we will explain it in more detail. is omitted.

Therefore, in the door closer back check device according to the present invention, the cylinder 1 is placed inside the cylinder cap on the side where the piston 4 approaches when the door rotates in the releasing direction, that is, the cylinder cap 2 shown at the right end in FIG. A back check rod 9 with a regular hexagonal cross section (see FIG. 2) extends coaxially therewithin and projects therefrom. The outer end (the first
In the illustrated embodiment, the right end portion in the figure is fluid-tightly and rotatably fitted into the cylinder cap 2 via a spring adjusting screw 11. That is, the outer end of the back check rod 9 is formed to have a circular cross section, and this outer end is connected to the inner hole of the cylindrical spring adjustment screw 11 with a male thread carved on the outer circumferential surface. It is fitted so that it can rotate freely. As shown in FIG. 2, the back check rod 9 includes a retaining ring 12 fitted near the boundary between the circular cross section and the irregular cross section, and an inner end of the inner hole of the spring adjusting screw 11. The retainer washers 13, 13 fitted into the enlarged diameter portion formed in the spring adjustment screw 11 are engaged with each other so as not to come off the spring adjustment screw 11. Note that the joint between the back check rod 9 and the spring adjustment screw 11 is liquid-tightly sealed by the 20th ring 14 housed in the enlarged diameter section, and also by the expansion ring 14 that houses the retainer washer. The opening edge of the inner diameter hole is crimped inward to prevent the retainer washer 13 from slipping out.

On the other hand, the outer end of the spring adjustment screw 11 is fitted into an engagement hole (not numbered) that passes through the cylinder cap 2 in the cylinder axial direction. The spring adjustment screw 11 has a spring receiver 1 screwed onto its outer periphery.
It receives elasticity from torque springs 5, 5 through thrust washers 16, 16, and is crimped to cylinder cap 2 through thrust washers 16, 16, and is locked to cylinder cap 2 through circlip 17.

The fitting portion between the outer end of the spring adjustment screw 11 and the engagement hole is liquid-tightly sealed by a 30th ring 18.

Further, the outer end of the inner hole of the spring adjustment screw 11 is formed so that the cross section is, for example, a regular hexagon, and a hexagonal wrench is fitted into this portion to rotate the spring adjustment screw 11 from the outside. As a result, the position of the spring receiver 15 that is screwed thereto in the cylinder axis direction can be adjusted, and therefore the elasticity of the torque springs 5, 5 can be adjusted, but the elasticity adjustment mechanism of the torque springs 5, 5 is not Since this is not an essential component of the invention, further detailed explanation will be omitted.

Furthermore, with the above-described configuration, as shown in FIG.
The inner hole of the spring adjustment screw 11 is exposed to the outside of the cylinder, and for example, a slot is formed. Therefore, the back check rod 9 can be rotated from outside the cylinder using a screwdriver or the like.

On the other hand, a mounting hole 19 is opened at the end of the piston 4 facing the back check rod 9 and extends coaxially through the end of the piston 4 with the back check rod 9. has been done. A back check valve 21 is screwed into this mounting hole 19. As shown in FIGS. 3 and 4, the back check valve 21 has an inner hole with an irregular (regular hexagonal in the illustrated embodiment) cross section that slidably fits into the back check rod 9. It is a cylindrical body with a male thread formed on a part of the outer cylindrical surface, and the outer periphery has a cross section V that becomes deeper toward the inner end (the left end in Figs. 1 and 4) along the generatrix.
A letter-shaped orifice groove 21a is formed.

As shown in FIG. 1, the back check valve 21 molded as described above has a male threaded portion on the outer circumferential surface screwed into the mounting hole 19 of the piston, and a cylindrical portion on the outer end side is formed into a short cylindrical shape with a flange. When fitted with the valve washer 22, the inner end of the back check rod 9 is fitted into its inner hole.

A notch 9a of a certain length is formed at the inner end of the back check rod 9 along its generatrix. Therefore, when the part formed with this notch 9a is fitted with the back check valve 21, as shown in FIG. will be formed. The length of this notch 9a is such that the distance between the stepped part of the back check rod 9 where the notch starts and the outer end surface of the back check valve 21 (see FIG. 1) is smaller than the rightward movement stroke of the piston 4. It shall be set as follows.

The valve washer 22 is crimped to the end surface of the piston 4 by the elasticity of the torque spring 5, and the flange portion of the valve washer 22 extends parallel to the mounting hole 19 to the end surface of the piston 4, as shown in FIG. The large-diameter outer end opening of the stepped rectifying hole 23 passing through the hole is partially covered to prevent the ball valve 24 housed in the rectifying hole 23 from falling off.
Further, a retaining ring 12 as a stopper is fitted to the outer end of the back check valve 21.

[Effect]

In the door closer back check device according to one embodiment of the present invention configured as described above, when the back check rod 9 is rotated by a screwdriver or the like as described above, the back check rod 9 and the back check valve 21 are separated from each other. Since they are mutually restrained in the circumferential direction, the back check valve 2
1 also rotates, and with the above-described structure, the back check valve 21 moves in the axial direction of the back check rod 9, and as shown in FIGS. The distance 1 (hereinafter referred to as 1 dimension) between the notch step portion 9 and the notch step portion changes. As will be described later, the opening angle of the door when the bag check device starts to operate is uniquely set by the above l dimension.

In the illustrated embodiment, at the same time, the degree of opening of the orifice formed in the outer periphery of the back check valve changes. That is, when the back check valve is pulled out to the maximum extent from the mounting hole 19 of the piston, as shown in FIG. The cross section of the orifice groove 21a is maximized, and on the other hand, the back check valve 21 is screwed into the mounting hole 19 to the maximum extent until its retaining ring 12 comes into contact with the valve washer 22, as shown in FIG. So,
Conversely, the opening of the orifice becomes the smallest.

As described above, by operating the back check rod 9 from the outside,
When the door is rotated in the opening direction in a door closer that has been properly set (see Fig. 1), the piston 4 moves to the right in Fig. Move to. Then, the hydraulic oil in the cylinder interior space in which the back check rod 9 extends is pressurized by the piston 4, and this pressure presses the ball valve 24 against the stepped portion in the rectifying hole 23. Since the orifice opening formed on the outer periphery of the back check valve 21 has a large flow resistance, the pressurized hydraulic oil mainly flows through the notch 9a of the back check rod and the inside of the back check valve 21. It passes through a flow path with a large cross-sectional area formed between the hole and the hole (see FIG. 3) into the cylinder interior space on the pinion gear 7 side. At this time, the piston 4 is not damped and can be opened in the same way as a door with a normal door closer that is not equipped with a back check device.

In such an operating state, as shown in FIG. 7, the back check valve 21 moves while sliding on the back check rod 9, from when the door is fully closed as shown in FIG. check black 9
This continues until the notch step is reached.

When the outer end surface of the back check valve 21 reaches the notch step of the back check rod 9 and the flow path between the notch 9a and the inner hole of the back check valve 21 is blocked, the hydraulic fluid is has no choice but to pass through an orifice formed on the outer periphery of the back check valve 21, and the piston 4 is damped by the viscous resistance generated here, applying braking to the door. That is, the back check device starts operating. The operation of this back check device is continued until the piston 4 reaches the end of its travel stroke in the door opening direction within the cylinder 1.

As mentioned above, the opening angle of the door from when the door begins to open until the back check device starts operating is:
It is uniquely determined by the l dimension (see FIGS. 5 and 6). In the illustrated embodiment:
When the l dimension is small, that is, when the opening angle of the door is small when the brake starts to be applied to the door, the opening degree of the orifice is large and therefore the braking applied to the door is gentle, but when the l dimension is large,
The opening angle until the door starts to be braked is large,
In return, strong braking is applied. Using this,
The braking force applied to the door and the opening angle of the door when the braking starts to be applied can be appropriately set in consideration of the position of obstacles etc. at the location where the door is installed and the ease of use.

When the door is released after passing through the door, the piston 4 is
moves in the opposite direction to when the door is opened, and returns to the position shown in the first figure while being buffered in the same way as in a normal door closer. At this time, the ball valve 24
Since the hydraulic oil falls into the large diameter portion of the rectifying hole 23, the hydraulic fluid passes through the rectifying hole 23 and escapes into the cylinder interior space on the side where the back check rod 9 extends. Therefore, the orifice formed on the outer periphery of back check valve 21 does not operate.

[Other Examples]

Note that the present invention is not limited to the illustrated embodiment, and can be implemented with various modifications.

For example, in the illustrated embodiment, the orifice groove 21a formed in the outer peripheral surface of the back check valve 21 is inclined with respect to the central axis. If the opening angle of the door when the back check device starts operating is adjusted, the braking force applied to the door will change accordingly. This has some advantages, but since the braking force can be constant, it is necessary to adjust only the opening angle of the door when the back check device starts operating without changing the braking force. The orifice groove 21a may be formed parallel to the axis of the back check valve 21 and have a uniform depth (not shown).

Further, the cross-sectional shape of the back check rod 9 is not limited to the hexagonal shape shown in the figure, but may be of any shape such as an oval shape or a rectangular shape.

〔effect〕

As is clear from the above description, the present invention provides a back check block with an irregular cross section that extends parallel to the axis of the cylinder inside the cylinder cap on the side where the piston approaches when the door moves in the opening direction. A protruding door is provided so that the back door can be rotated from the outside,
An orifice groove is formed along the generatrix of the outer peripheral surface at the end of the piston facing the back check rod, and the back check rod is a cylindrical back having an inner hole with an irregular cross section that slidably fits into the back check rod. Since the check valve is screwed on and a notch is formed in the inner end of the back check rod along its generatrix, by rotating the back check rod, the back check valve can be moved in the direction of the cylinder axis. By moving the door and changing the relative distance between the outer end surface of the back check valve and the notch step of the back check rod, the opening angle of the door when the back check device begins to operate can be adjusted.

Furthermore, for the same reason, the door can be opened like a normal door closer without any braking being applied to the door until the back check device starts operating, and various other effects can be achieved.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the essential parts of a door closer equipped with a back check device according to an embodiment of the present invention, showing the door in a closed state, and Fig. 2 illustrates a method of supporting the outer end of the back check rod. FIG. 3 is an end view of the back check valve, FIG. 4 is a plan view of the back check valve, and FIGS. 5 and 6 are for explaining the operation of the adjustment mechanism for starting the back check operation. FIG. 7 is an enlarged partial sectional view of the door closer, and FIG. 7 is a sectional view of the main part of the door closer similar to FIG. 1...Cylinder, 2...Cylinder cap, 4
...Piston, 9...Batch check rod, 9
a... Notch, 19... Mounting hole, 21... Back check valve, 21a... Orifice groove, 22...
...Bulb washia.

Claims (1)

[Claims] 1. A cylinder whose both ends are closed with cylinder caps and which has hydraulic oil sealed inside, and a piston that is slidably fitted into this cylinder and moves within the cylinder in conjunction with opening and closing of the door. a back check rod with an irregular cross section extending parallel to the axis of the cylinder and projecting from the inside of the cylinder cap on the side where the piston approaches when the door rotates in the opening direction; The outer end of the back check rod is liquid-tightly and rotatably fitted into the cylinder cap, and the outer end surface of the back check rod is exposed to the outside, while the back check rod is opposite to the cylinder cap. At the end of the piston, an orifice groove is formed along the generatrix of the outer circumferential surface, and a cylindrical back check valve having an inner hole of an irregular cross section that slidably fits into the back check rod is attached to the back check rod. Screw coaxially with
On the other hand, a back check device for a door closer is characterized in that a notch is provided at the inner end of the back check rod along its generatrix line to form a flow path for hydraulic oil between the back check rod and the inner hole of the back check valve. 2. A back check device for a door closer according to claim 1, wherein the orifice groove is inclined with respect to the axis of the back check valve. 3. A back check device for a door closer according to claim 1, wherein the orifice groove is parallel to the axis of the back check valve.