JPH0245748B2 - DOAKUROOZA - Google Patents

Description

[Detailed description of the invention] The present invention relates to a door closer.

Conventionally, in the above-mentioned door closer, as shown in FIG. 1, a lock tooth is carved on the outer periphery of a piston 3 in a cylinder 2 which is normally biased in the direction of closing the door by using both the elastic force of a spring 1 and the pressure of filling oil. 4 and a pinion 5 connected to an arm (not shown) attached to the door frame, the rack teeth 4 and pinion teeth 6 are provided with a length corresponding to the rotation angle range of the door, and the remaining angle range is In the case, the rack tooth 4
The tooth end 4a of the pinion 5 is formed so that the outer circumferential surface 5a of the pinion 5 can be frictionally engaged, and the length of the outer circumferential surface 5a from which the pinion teeth 6 are missing is set to the easy tooth missing portion 7. An end face 5b is formed with a length corresponding to the length of the engagement, and has a notched step at the end of the outer circumferential face, and the end face 5c of the outer peripheral face and the easy-toothed end 4a are connected to each other, and the end face 5b and the easy-toothed end 4a A door closer having an internal stop-type door opening limiting mechanism configured so that surface contact can be made with the tooth end portion 8 at the same time is known, proposed by the applicant.

According to the door closer configured as described above, the door can be temporarily held at a predetermined angle, and if a strong external pressure (strong wind, etc.) is suddenly applied while the door is being held open, the door can be stopped at the predetermined opening angle, so that the door can be held against the rear wall. This method is effective in preventing damage to doors and walls caused by collisions with other objects, but on the other hand, it is only possible to obtain a kind of door opening angle limit, or it is impossible to have no limit, so the range of use is limited. was limited.

Therefore, as a result of studies in view of the above-mentioned conventional circumstances, the present invention has two types of door opening restriction, large and small, or functions with and without door opening restriction, and each of these functions can be selected by an extremely simple operation. A new door closer was developed for this purpose.

Hereinafter, the present invention will be described in detail based on a first embodiment shown in the drawings, in which the present invention is adopted as a door closer having an internal stop type door opening limiting function. Plug 9,9
A lock tooth 4 is carved on one side of the outer periphery of the piston 3 in the cylinder 2 which is always biased in the direction of the closing door using both the elastic force of the spring 1 installed inside the cylinder 2 closed by the cylinder 2 and the pressure of the filling oil. The rack teeth 4 are engaged with a pinion 5 which is attached to the door frame 10 and connected to an arm (not shown), and the pinion 5 is connected to the door opening angle range (e.g.
160°), the length of the rack teeth 4 on the piston 3 corresponds to the initial arbitrary angle range (for example, up to 90°), and the length corresponds to the remaining angle range (for example, 90° to 160°). The part is a toothless part 7, and the end (for example, 160° or more) is provided with a toothless end part 8, and the pinion 5 is also provided with a pinion tooth 6 of a length corresponding to the initial rack tooth length. In the area corresponding to the toothless portion 7 of the rack, no teeth are carved, leaving the outer peripheral surface 5a, and furthermore, a step is formed at the end 5c of the outer peripheral surface 5a of the pinion 5 so as to make surface contact with the end portion 8 of the toothless rack. The end face 5b is formed by having a cutout circle.

The present invention provides the pinion 5 with an opening limiting groove 5d extending from the end of the end surface 5b toward the outer circumference, and a limiting pin 11 that is freely engageable and detachable from the opening limiting groove 5d.
A pinion chamber 14 is provided at a suitable location in the housing 12 that forms the cylinder 2 and houses the pinion 5.
The outer circumferential surface 5a of the pinion 5 engages with the above-mentioned easy tooth missing portion 7, and the outer circumferential surface 5a and the easy tooth end 4a are connected to each other. In the open door holding state shown in FIG. 4, in which the pinion 5 is engaged with the end 5e of the opening limiting groove 5d and the limiting pin 11 is engaged with each other, the pinion 5 is prevented from rotating further in the door opening direction. This prevents the door from moving and limits the opening angle to a small one.
Furthermore, by disengaging the opening limiting groove 5d from the limiting pin 11, the door angle is limited to the wide opening angle as shown in FIG.

Here, the limiting pin 11 is formed into a cylindrical shape, and one protruding corner of the inner end thereof is cut out to form the cutout part 1.
1a, and by rotating the limiting pin 11 by, for example, 180 degrees, the cutout 11a and the protrusion 11b located symmetrically thereto can be selectively moved into the pinion chamber 14.
The cutout portion 11a does not protrude into the pinion chamber 14, while the protrusion 11b protrudes into the pinion chamber 14 and slidably engages with the opening limiting groove 5d, thereby preventing the pinion The rotation angle of 5 is regulated as described above.

Further, this restriction pin 11 is provided with a neck portion 11c, into which an O-ring 15 is fitted, and the above-mentioned mounting hole 1
3 so that it does not come off by caulking or the like, and it is preferably arranged so that it can be rotated in a watertight manner.

Furthermore, if the operating shaft 16 is disposed in the door 10 so that it can be rotated from the outside in a hole 10a coaxially formed through the hole 10a with the restriction pin 11, the restriction pin 11 can be rotated as described above even after being attached to the door 10. Two types of door opening restrictions can be selected by rotating the button.

Further, the present invention may adopt a rack and pinion system without a door opening restriction mechanism as in the second embodiment shown in FIG. 5, and in such a case,
By switching the rotation of the restriction pin 11, it is possible to have a function with or without restricting door opening.

Here, the rack teeth 4 and the pinion teeth 6 are provided with a length corresponding to the desired door opening angle range, and the opening limiting groove 5d is set such that the end 5e and the limiting pin 11 are engaged and disengaged at the desired door opening angle. It goes without saying that it is provided in correspondence with the restriction pin 11 with a preset position and length. Note that there are alignment marks a on the outer end of the restriction pin 11 and the surface of the housing 12, etc.
It is recommended to display restriction marks b and restriction release marks c at 180° intervals.

In the above configuration, the protrusion 1 of the restriction pin 11
1b and the opening limiting groove 5d are disengaged, when the door starts to be opened from the closed state shown in FIG. 2, the pinion 5 rotates counterclockwise in the figure and meshes with the rack teeth 4. The piston 3 moves forward and the spring 1 is compressed. Until the front end of the outer circumferential surface 5a of the pinion 5 comes into contact with the end 4a of the rack tooth, when the door is released from the hand, the door will automatically close due to the elastic force of the spring 1, but according to the first embodiment, after that, the door will close automatically due to the elastic force of the spring 1. The outer peripheral surface 5a and the above-mentioned rack tooth end 4
a is frictionally engaged, the piston 3 remains stationary,
The door is held in the open position.

When a strong external pressure is suddenly applied in the door opening direction while the door is being held open, the pinion 5 rotates even more rapidly in the door opening direction, but the end surface 5b provided at the end of the outer peripheral surface of the pinion 5 is shown in FIG. As a result, the pinion 5 comes into surface contact with the toothless distal end 8, and further rotation in the door opening direction is restricted, and the pinion 5 stops before the door collides with the rear wall or the like. That is, the door is limited to a wide opening angle.

Further, if the restriction pin 11 is rotated 180 degrees so that the protrusion 11b and the opening restriction groove 5d are engaged with each other, when the door starts to open from the closed state shown in FIG. When the door rotates and meshes with the rack tooth 4, and the end 4a of the rack tooth contacts the outer peripheral surface 5a of the pinion 5, when the door is released from the hand, the door closes automatically as described above, but after that, the rack tooth 4 engages with the rack tooth 4. The frictional engagement between the end 4a and the outer circumferential surface 5a keeps the piston 3 stationary and the door in its open position. In this state, when an external force is further applied to the door in the door opening direction, the end 5e of the opening limiting groove 5d and the protrusion 11b of the limiting pin 11 come into contact as shown in FIG. rotation is restricted and the door is restricted to a small opening angle.

In addition, in the second embodiment, the end 5 of the opening limiting groove 5d
When the opening force of the door is released within the range where the protrusion 11b of the limiting pin 11 comes into contact with the end 5e, the door closes automatically, but when the end 5e and the protrusion 11b come into surface contact, the pinion 5 cannot be opened any further. Rotation towards the door is restricted and door opening is restricted.

Since the present invention has the above-mentioned structural effects,
When used in conjunction with a conventional door opening limiting mechanism, the opening angle of the door can be limited to two types, large and small, by engaging and disengaging the opening limiting groove 5d and the limiting pin 11. For models that do not have a door opening restriction mechanism, it is possible to have both functions with and without the door opening restriction function, so one model can be used for doors for various purposes, expanding the range of use, and also having a door opening restriction function. 1 type, 2 types, presence or absence can be easily performed by simply rotating the restriction pin 11, and it is also structurally simple, and is a slight improvement over the conventional product. It is inexpensive because you only need to add
Moreover, it has advantages such as being able to be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view illustrating a door closer having a conventional internal stop type door opening restriction mechanism;
2 to 4 respectively show a first embodiment of the door closer according to the present invention, FIG. 2 is a longitudinal sectional side view of the door in the closed state, and FIG. 3 is a side view of the door in the wide-opening restricted state. FIG. 4 is a partially longitudinal side view of the door in a state where the door is limited to opening a small amount, and FIG. 5 is a partially longitudinal side view of the door closer in a state where the door is limited to opening. 2... Piston, 4... Rack tooth, 5... Pinion, 11... Limiting pin.

Claims (1)

[Claims] 1 It has a rack tooth engraved on the piston and a pinion that is linked to the opening and closing of the door, and within a predetermined opening angle range of the door, selectively regulates the pinion at a rotation angle corresponding to the desired opening angle of the door. A door closer characterized in that a restriction pin is provided that can be switched and operated.