JPH07269219A - Adjusting device for arm length of door closure - Google Patents

Abstract

PURPOSE:To simplify structure and manufacture while preventing the generation of backlash in an arm in usage for a prolonged term. CONSTITUTION:A slot 43 is formed to an internal connecting lever 41 in an arm 4 while a first oblique serration 43a is formed to the internal surface of the slot 43. A non-circular receiving hole 44 is formed to one plate surface of an external connecting lever 42. A combining piece 5 fitted into the receiving hole 44 in an unturned manner is provided. A second oblique serration 5a engaged with the first oblique serration 43a is formed to the combining piece 5. A fitting hole 45 is shaped to the other plate surface of the external connecting lever 42. A screw 6 for adjustment is screwed into the tapped hole 53 of the combining piece 5 through the fitting hole 45, and the combining piece 5 is brought near, thus engaging the second oblique serration 5a on the combining piece 5 with the first oblique serration 43a of the internal connecting lever 41.

Description

Detailed Description of the Invention

[0001]

[Industrial applications]

The present invention relates to a device for adjusting an arm length of a door closer. In other words, the present invention relates to an improvement of the arm length adjusting device that adjusts the arm of the door closer to a proper length and fixedly holds the arm at the proper length.

[0003]

2. Description of the Related Art As shown in FIGS. 5 to 7 (however, refer to FIG. 1 for the overall structure of a door closer), a closer body fixed to a door, a bracket fixed to a door frame, A door closer, which includes a closer body and two arms (links) that link the bracket to each other, has been conventionally known. Further, at least one arm 9 of the two arms is fitted so as to be expandable and contractable with each other. The inner connecting rod 91 and the outer connecting rod 92 are combined, and both connecting rods 9
A device for adjusting the arm length, which is provided with fixing means 93 between 1 and 92 as described below, is also known.

The fixing means 93 has a long hole 94 provided along the lengthwise direction of the inner connecting rod 91, first vertical serrations 94a provided vertically on both sides of the inner surface of the long hole 94, and an outer connecting rod 9.
Projection 9 provided inside 2 along the long hole 94
5, the second vertical serrations 95a provided so as to be able to mesh with the first vertical serrations 94a, and the inner connecting rods 91 in the outer connecting rods 92, on both outward surfaces in the width direction of the protrusion 95. A tubular piece 96 that pushes the inner connecting rod 91 in the thickness direction with respect to the outer connecting rod 92 in order to engage the first vertical serration 94a and the second vertical serration 95a by displacing them in the thickness direction at the time of the coupling, A set screw 97 that penetrates through a fitting hole 96a provided in the axial direction of the tubular piece 96;
And a female screw hole 98a provided in a fixing piece 98 on the outer connecting rod 92 for screwing the tip of the set screw 97.

However, such a conventional arm length adjusting device has a complicated structure as a whole, and the second vertical serration must be formed on the inner surface of the protrusion in the space of the outer connecting rod. Is troublesome, and when pushing the cylinder piece with the set screw to engage the first and second serrations with each other, the serrations do not engage unless the set screw is tightened after aligning the peaks and valleys. As it is, that is, since the inner connecting rod and the outer connecting rod are fixed with both serrations riding in the thickness direction, both connecting rods are easily slipped in the length direction during use, and rattling occurs on the arm. Therefore, there is a defect that the original operation of the door closer is disturbed.

[0006]

The device for adjusting the arm length of the door closer according to the present invention eliminates the above-mentioned drawbacks, simplifies the overall structure, simplifies the manufacture, and further prolongs the operation. The present invention has been proposed for the purpose of preventing rattling of the arm during use over a long period of time so that the door closer can always be operated smoothly.

[0007]

In order to achieve the above-mentioned object, the invention described in claim 1 is such that an elongated hole is opened along the lengthwise direction, and the opening end edge of the elongated hole is provided with a first diagonal. The inner connecting rod formed with serrations, the outer connecting rod which is extendably fitted to the inner connecting rod and has a non-circular receiving hole opened, and the receiving hole of the outer connecting rod fitted non-rotatably. At the same time, it is characterized in that it has a coupling piece that forms a second serration that meshes with the first serration, and an adjusting screw that tightens the coupling piece to the inner coupling rod with the outer coupling rod sandwiched therebetween.

Further, the invention according to claim 2 includes a closer body fixed to the door, a bracket fixed to the door frame,
A door closer comprising two arms linking the closer body and the bracket; one arm is composed of a pair of an inner connecting rod and an outer connecting rod fitted to each other so as to be capable of expanding and contracting; a length of the inner connecting rod A long hole is provided along the direction, and on the inner surface of the long hole in the length direction, a large number of peaks are projected at right angles to the height direction from a surface inclined with respect to the flat plate surface of the inner connecting rod. 1 Providing diagonal serrations; Providing a non-circular receiving hole on one flat plate surface of the outer connecting rod; Having a connecting piece that fits into the receiving hole in a non-rotatable manner; Providing a second diagonal serration that meshes with the first diagonal serration when mounted; providing a fitting hole into which the adjusting screw is inserted on the other flat plate surface of the outer connecting rod; and connecting the adjusting screw through the fitting hole Provided on one side It is screwed into the screw hole by summon the coupling piece, a configuration condition that is meshed with second oblique serration on the strip attached to the first oblique serration inner connecting rod.

[0009]

With respect to the arm 4 whose length should be properly adjusted, the inner connecting rod 41 is slidably adjusted with respect to the outer connecting rod 42 in the length direction (direction of arrow A) as shown in FIG. Is fitted into a receiving hole 44 provided on one flat plate surface of the outer connecting rod 42, and the adjusting screw 6 is inserted into a fitting hole 45 provided on the other flat plate surface of the outer connecting rod 42. The tip of the screw is screwed into the screw hole 53 of the connecting piece 5 (see FIG. 3).

Next, as shown in FIG. 4, the adjusting screw 6
When the screw is further screwed into the connecting piece 5, the second slanted serration 5a provided on the connecting piece 5 is higher than the first slanted serration 43a provided on the elongated hole 43 of the inner connecting rod 41 by the height of the peaks of both serrations 5a and 43a. The serrations 5a and 43a are in close contact with each other in the depth direction, that is, in the depth direction of the valley, and fix the inner connecting rod 41 and the outer connecting rod 42 in close contact with each other.

When the adjusting screw 6 is screwed in as described above, the peaks and valleys of the second diagonal serration 5a are connected to each other by the connecting rod 41,
Even if the first slanted serrations 43a are displaced from the valleys and the peaks in the lengthwise direction of 42, the wedge action caused by the joining of the slopes between the peaks and the troughs automatically causes the inner connecting rods to bite when the serrations 5a and 43a are bitten. 41 is moved by a minute distance to correct the deviation between the serrations 5a and 43a.

Due to the above-mentioned operation, the inner connecting rod 41 and the outer connecting rod 42 are held by the adjusting screw 6 and the connecting piece 5 so as not to be loosened easily.

When it is necessary to readjust the length of the arm 4 for some reason after connecting the connecting rods 41 and 42, the adjusting screw 6 is adjusted to the extent shown in FIG. The length of the arm 4 may be corrected by loosening it once and moving the inner connecting rod 41 again in the direction of arrow A with respect to the outer connecting rod 42, and then the adjusting screw 6 may be tightened again.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in FIGS. FIG. 1 shows an example of the overall structure of a door closer in which the present invention can be implemented.
And a bracket 2 fixed to the door frame 20 with mounting screws 82 and the like.
And two arms 3 and 4 that movably link between the closer body 1 and the bracket 2.

The closer body 1 is for adjusting the opening / closing speed of the door 10 with a built-in spring, a buffer solution or the like, and its form is not limited as long as it exhibits an adjusting action with respect to the speed.

One end of the first arm 3 is pivotally attached to the closer body 1 via a rotating shaft 11 such as a pinion shaft, and the other end of the first arm 3 and one end of the second arm 4 are connected to each other. It is pivotally attached via a pivot 31. Further, the other end of the second arm 4 is pivotally attached to the bracket 2 by a pivot 21.

At least one of the first arm 3 and the second arm 4 has at least one arm 4 which has an inner connecting rod 41 and an outer connecting rod 42 which are telescopically fitted to each other, for example. It is composed of a set, and the length of the arm 4 is adjustable.

The structure as described above is conventionally known. The arm whose length can be changed may be either the first arm 3 or the second arm 4, but it is quite common to adjust the length of the second arm 4 as in the illustrated example. .

In the present invention, the inner connecting rod 41 of the arm 4 is provided with a long hole 43 along the length direction thereof. Although the outer end side of the long hole 43 may be open, it is preferable that both ends are closed as shown in FIG. 2 because the strength is excellent.

On the inner surface of the long hole 43 in the longitudinal direction, a large number of chevron sections are projected at right angles in the height direction from the horizontal surface of the inner connecting rod 41, that is, the surface inclined with respect to the flat plate surface. The first diagonal serration 43a is provided. A large number of ridges of the serration 43a are formed so as to form a right angle with the longitudinal direction of the inner connecting rod 41.

On the other hand, one of the horizontal surfaces of the outer connecting rod 42, which has a square cross-section with which one end of the inner connecting rod 41 is slidably fitted, that is, one flat plate surface, is provided with a connecting piece 5 described later. A non-circular receiving hole 44, such as an oval, which is immovably fitted is provided. The flat plate surface of the outer connecting rod 42 provided with the receiving hole 44 is
It may be the upper surface or the lower surface.

The connecting piece 5 in the illustrated example has a cross section (fitting direction B).
Although the body 51 has an elliptical shape (the cut surface forming a right angle with), the flange-shaped head 52 is integrally provided, but the shape of the coupling piece 5 is not limited to the illustrated example. .

However, when the connecting piece 5 is fixedly mounted, that is, when it is fixedly mounted between the inner connecting rod 41 and the outer connecting rod 42, the first diagonal of the inner connecting rod 41 is changed. A second diagonal serration 5a that meshes with the serration 43a is provided.

The surface on which the second diagonal serration 5a is formed is provided on the connecting piece 5 inclining with respect to the fitting direction (arrow B direction) of the connecting piece 5 with respect to the outer connecting rod 42.

A fitting hole 45 into which the adjusting screw 6 is inserted is provided on the other horizontal surface of the outer connecting rod 42, that is, the other flat plate surface.

The adjusting screw 6 is provided through the fitting hole 45 so as to be opposed to the outer connecting rod 42 and the inner connecting rod 41 of the connecting piece 5 in the inserting direction (arrow B direction).
The second oblique serration 5 on the connecting piece 5 is screwed in the direction of the arrow C to call the connecting piece 5.
The a is closely meshed with the first diagonal serration 43a of the inner connecting rod 41 and is meshed with the first diagonal serration 43a.

When the connecting piece 5 is called by the adjusting screw 6, the flange-shaped head portion 52 of the connecting piece 5 serves as a stopper for limiting the fitting depth, but the connecting piece 5 has its tip. Since the fitting insertion depth (invocation depth) can be limited also by abutting the inner surface of the outer connecting rod 42, it is not always necessary to provide the flange-shaped head portion 52.

Further, in the illustrated embodiment, a female screw hole is formed in the coupling piece, and the adjusting screw is screwed into the female screw hole to tighten the second serration so as to be called the first serration. , It is not always necessary to form a female screw hole in the coupling piece.For example, the female screw hole of the coupling piece should be a hole having a normal smooth inner peripheral surface, and a nut should be attached to the tip of the adjusting screw protruding from this hole. The same effect can be obtained by tightening.

[0029]

According to the above-described device for adjusting the arm length of the door closer of the present invention, the first diagonal serration of the inner connecting rod and the second diagonal of the connecting piece are irrespective of the simple structure and manufacture. Since the serrations are closely meshed in an aligned state by the action between the connecting piece and the adjusting screw screwed with the connecting piece, the connection between the inner connecting rod and the outer connecting rod is free from rattling for a long time. Can be maintained in a state,
Therefore, the door closer can be operated smoothly at all times.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a door closer capable of implementing an arm length adjusting device of the present invention.

FIG. 2 is an exploded perspective view of a main part of an embodiment of an arm length adjusting device for a door closer according to the present invention.

FIG. 3 is an enlarged cross-sectional view of the main part of the adjusting screw during the screwing process.

FIG. 4 is an enlarged cross-sectional view of the main part of the arm in use after adjusting the arm length.

FIG. 5 is an exploded perspective view showing a main part of a conventional arm closer adjusting device for a door closer.

FIG. 6 is an enlarged cross-sectional view of the main part of the set screw during the screwing process.

FIG. 7 is an enlarged transverse cross-sectional view of a main portion of the arm in use after adjustment of the arm length.

[Explanation of symbols]

 10 door 20 door frame 1 closer body 2 bracket 3 arm (first arm) 4 arm (second arm) 41 inner connecting rod 42 outer connecting rod 43 long hole 43a first diagonal serration 44 receiving hole 45 fitting hole 5 connecting piece 5a Second diagonal serration 53 Screw hole 6 Adjustment screw

Claims (2)

[Claims] 1. An inner connecting rod in which a long hole is opened along the length direction, and a first oblique serration is formed at an opening edge of the long hole, and the inner connecting rod is fitted in an expandable and contractible manner. An outer connecting rod having a non-circular receiving hole opened, a connecting piece fitted into the receiving hole of the outer connecting rod in a non-rotatable manner, and forming a second serration that meshes with the first serration, and this connecting piece. An adjusting device for adjusting the arm length of a door closer, which has an adjusting screw for tightening the outer connecting rod with the inner connecting rod. 2. A door closer comprising a closer main body fixed to a door, a bracket fixed to a door frame, and two arms connecting the closer main body and the bracket; Constituting a set of an inner connecting rod and an outer connecting rod fitted together; a long hole is provided along the length direction of the inner connecting rod, and a flat plate surface of the inner connecting rod is provided on the inner surface in the length direction of the long connecting hole. A number of peaks are projected at right angles to the height direction from the inclined surface.
Providing slanted serrations; Providing a non-circular receiving hole on one flat plate surface of the outer connecting rod; Having a connecting piece that fits into the receiving hole so that it cannot rotate; At this time, a second diagonal serration that meshes with the first diagonal serration is provided; a fitting hole into which an adjusting screw is inserted is provided on the other flat plate surface of the outer connecting rod;
The adjusting screw is screwed into the screw hole provided in the connecting piece through the fitting hole to call the connecting piece, thereby engaging the second oblique serration on the connecting piece with the first oblique serration of the inner connecting rod. A device for adjusting the arm length of the door closer as a constituent condition.