JP3446046B2 - Adjuster for arm length of door closer - Google Patents

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 according to claim 1 opens a long hole along the length direction, and at the inner surface of the long hole in the length direction, Horizontal
A number of chevron-shaped projections are high from the surface inclined to the surface.
An inner connecting rod formed with a first oblique serration projecting at a right angle to the direction, and an outer connecting rod which is fitted to the inner connecting rod in an extendable and contractable manner and has a non-circular receiving hole opened in one flat plate surface thereof. A rod, a coupling piece that is non-rotatably fitted in a receiving hole of the outer connecting rod, and has a second diagonal serration that meshes with the first diagonal serration, and the coupling piece are interposed between the rod and the coupling piece. It is characterized by having an adjusting screw for tightening the inner connecting rod while sandwiching the outer connecting rod.

The invention according to claim 2 is 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 , one arm is constituted by mutually telescopically mated inner connecting rod and outer connecting rod pair, along the length of the inner communicating rod provided with a long hole, the length of the inner surface of the long hole , The water of the inner connecting rod
Setting a first diagonal serrations as many cross mountain shaped protrusion from the surface is inclined relative to the flat surface is projected at a right angle in the height direction only, while non on one of the flat surfaces of the outer connecting rod with kicking setting a circular receiving bore, the other flat surface of the outer connecting rod is opened the fitting hole inserting the adjusting screw, while providing a bond pieces mate to non-rotatably to the receiving hole, the connection piece in a second oblique serration meshing with the first oblique serration
Formed, also, the adjustment screw for securing the inner and outer connecting rod, by summon the coupling piece is screwed into a threaded hole provided in the connecting piece through the fitting hole, the first oblique serration inner connecting rod characterized in that is meshed with second oblique serration on the strip attached to.

[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 long 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 to 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 generated by the joining of the slopes of the peaks and the troughs automatically causes the inner connecting rods to bite in both serrations 5a and 43a. 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 such as a blade and a sheath.
It is composed of a set of an inner connecting rod 41 and an outer connecting rod 42 which are fitted to each other so as to be capable of expanding and contracting, 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.

[0020] the length of the inner surface of the long hole 43 (opening edge) is the horizontal plane of the inner connecting rod 41, i.e. a number of cross-sectional chevron butt strip from the plane tilted with respect to the flat plate surface in the height direction First diagonal serrations 43a that project at right angles
To provide. 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. .

[0023] However, the joining piece 5 of the, the fixed
A second diagonal serration 5a is provided which meshes with the first diagonal serration 43a of the inner connecting rod 41 when fixedly mounted between the inner connecting rod 41 and the outer connecting rod 42.

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 doors 20 door frame 1 Closer body 2 bracket 3 arms (1st arm) 4 arms (2nd arm) 41 Inner link 42 Outer link 43 long hole 43a First diagonal serration 44 hole 45 Fitting hole 5 connecting pieces 5a Second diagonal serration 53 screw holes 6 Adjustment screw

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References: Kaihei 4-11887 (JP, U): Kaihei 5-76874 (JP, U): Sho 63-63403 (JP, U): Kohei 6- 3937 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E05F 3/00 E05C 17/00

Claims (2)

(57) [Claims] 1. A long hole is opened along the length direction, and an inner surface of the long hole in the length direction is inclined with respect to a horizontal plane.
A large number of chevron-shaped projections project from the raised surface at right angles to the height direction.
The inner connecting rod formed with the first slanted serration formed so as to project, and the inner connecting rod are extendably fitted and
The outer connecting rod having a non-circular receiving hole opened in the flat plate surface and the receiving hole of the outer connecting rod are non-rotatably fitted to the outer connecting rod and
An arm length of a door closer characterized by having a connecting piece formed with a second oblique serration that meshes with the oblique serration and an adjusting screw for tightening the connecting piece with the inner connecting rod with the outer connecting rod sandwiched therebetween. Adjuster. 2. A closer body fixed to the door, a bracket which is fixed to the door frame, the door closer consisting of two arms cooperating between said closer main body and the bracket, one arm each other telescopically composed of mated inner connecting rod and outer connecting rod pair, along the length of the inner communicating rod provided with a long hole, the length of the inner surface of the long hole in the horizontal plane of the inner connecting rod only set the first diagonal serrations as many cross mountain shaped protrusion from the tilted so surfaces against protrudes perpendicularly to the height direction, while non-circular receiving on one of the flat surfaces of the outer connecting rod with kicking setting the hole, opening a hole fitting insertion of the adjusting screw on the other flat surface of the outer connecting rod
On the other hand, on the other hand, install a coupling piece that fits in the receiving hole so that it cannot rotate.
Only, to form a second oblique serration meshing with the first oblique serration in the coupling piece, also the inner and outer communicating
Adjusting screw for fixing the rod, by summon the coupling piece is screwed into a threaded hole provided in the connecting piece through a pre-Symbol fit hole, the second oblique strip attached to the first oblique serration inner connecting rod An apparatus for adjusting the arm length of a door closer, characterized by engaging serrations.