DE8707409U1 - Door closer with a closing force indicator - Google Patents

Description

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- 6 1β 914 B/sta

Gretsch-Unitas GmbH

Building fittings Johann-Maus-Straße 3 7257 Ditzingen

Door closer with a closing force indicator

In

The invention relates to a door closer with adjustable closing force and a closing force display device, which consists of a sensor that can be moved by changing the closing force and a display unit that interacts with it. Such a door closer is known, for example, from DE-PS 32 24 300. In the normal case, the closing force

The door closer is set when it is put into operation depending on the size or weight of the door to be closed. It then remains unchanged for a long time. Often, it is not necessary to adjust the closing force for years. From this point of view, it is not economical to equip the door closer with an integrated closing force display device.

The object of the invention is therefore to design a door closer of the type mentioned at the beginning in such a way that the use of a door closer housing is possible as with a door closer without a closing force display device, but the closing force can still be displayed. When we talk here about displaying the closing force or a "closing force display device", this of course means that the closing force can also be adjusted using this display device, but the closing force is adjusted in a known manner and using conventional means, whereby the current closing force is displayed and can be read off via the closing force display device.

2To solve this problem, it is proposed according to the invention that the door closer with closing force display device according to the preamble of claim 1 is designed in accordance with the characterizing part of this claim. Now that the display unit of the closing force display device can be removably attached or held on the housing or the like of the door closer,

it can be easily removed after the closing force has been adjusted. In this respect, this display unit can be used not only for this one door closer, but at least for any other door closer of the same type. Therefore, over the series, there is definitely a reduction in manufacturing costs. In addition, existing door closers can also be easily retrofitted. Furthermore, it is not necessary to modify the door closer housing as was done before using a closing force display device. Of course, the display unit must be assigned to the door closer housing in a precisely specified manner because it interacts with a sensor, particularly one located inside the door closer, and therefore a precisely defined spatial assignment of the display unit to the sensor is essential. Above all, the sensor must be assigned to an adjustable display element of the display device in such a way that the display element shows, for example, zero closing force when there is no closing force. The exact assignment of the display device to the housing of the door closer can be achieved in a relatively simple manner and in a variety of ways.

Such a possibility is offered by a further development of the invention, which consists in the display device and the housing of the door closer being able to be coupled via a plug connection. In this case, one or more existing plug-in receptacles in the housing can be used or, if necessary, attached to them.

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In the above-mentioned embodiment, the plug-in elements must then be provided accordingly on the display device.

A preferred embodiment of the invention is characterized in that the display device has at least one, but preferably two insertion pins or the like, and the door closer housing or the like has a number of insertion receptacles corresponding to the number of pins. In the case of round insertion pins, the insertion receptacles are of course holes. The term "door closer housing"

"housing" also includes the housing cover. If any additional parts, such as fastening devices, are firmly attached to the door closer housing, the display device can also be attached to it. The only important thing is that the display device assumes a defined position in relation to the movement of the door closer.

Another variant of the invention is characterized in that the display device has at least one stop element, ' ) which cooperates with a stop surface of the door closer housing or the like to fix the position. This stop element or several such stop elements can be present in addition to the mentioned insertion pins or the like. However, there is less intention to use either the stop elements or the insertion pins on one and the same type of door closer or even both for alignment with the door closer housing.

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housing, rather it opens up the possibility of using the display device with two different door closer housings or door closer types, whereby in one version, for example, the insertion pins and in the other, the stop element(s) are used for precise alignment. The stop elements must be attached in such a way that the display device can be clearly and safely attached to the intended location on the door closer housing and that incorrect attachment is impossible.

; Further practical features and advantages of the door

; closer with its closing force indicator device result

I can be seen from the following description of an embodiment

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! The drawing shows two embodiments of the invention.

i Here represent:

■ Fig. 1 shows a perspective view of a

I f~) display device and a broken

1 door closer of a first

design,

Fig. 2 the same display device, but on a

Door closer of a different design mounted, also in perspective view,

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Fig. 3 again in perspective , based on

Fig. 1 an extended training of the
display device,

Fig. 4 a section along the line IV - IV de*

Fig. 1 through the door closer.

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door closer, while the door closer 2 in Fig. 2 is
a so-called overhead door closer. Even with the broken-off representation of the two door closer types, it is easy to
see that the housing 3 of the door closer'? 1 is formally separated from the housing
4 of the door closer 2. In addition, the housing 3 of the
door closer 1 is inserted in a known manner into a so-called floor box or concrete box 5. Nevertheless, even with this

In this embodiment, the display unit designed as a display device 6 is not attached to the concrete box 5, but to the housing 3, more precisely to the housing cover 7. It is the same in each case.

Q_ be indicator 6, but as a comparison of Figs. 1 I and 2 shows, it is used in two positions turned by 180°. |

The two door closers are essentially of a known design. For example, the floor door closer 1 has a ^!

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Door closer shaft 8, which protrudes upwards over the cover 7 and is connected in a rotationally fixed manner to the door to be closed, specifically to the lower end of the door. The closing force results from a door adjusting or closing spring 9, which in the exemplary embodiment concentrically surrounds a connecting rod 10 to the hydraulic piston shown, its end on the closing shaft side is supported according to Fig. 4 on a spring plate 11, which is part of an adjustment mechanism 12 for the closing force. Due to the

spring plate and its connection via a thread 14 with a

tubular attachment of a worm wheel 15, turning the latter causes the spring plate 11 to move and thus, depending on the direction of rotation, tensioning or relaxing the closing spring 9. In this way, the closing force of this door closer can be adjusted according to requirements. The worm wheel 11 works together with a worm (not visible in Fig. 4), the axis of which can be guided outwards through the housing. In Fig. 2, a corresponding axis of rotation 16 for adjusting the closing force can be seen, which is equipped with a hexagon socket 17 for attaching an adjustment tool. The latter is only to be understood as an example. In addition, instead of a holder, a pin can also be provided for attaching a key or the like that is equipped with a suitable holder. However, the flush termination of the adjustment mechanism with the housing or the side housing face, as shown in Fig. 2, is more advantageous. From the

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From the above it becomes clear that each closing force is assigned a specific displacement position of the spring plate 11 or a specific lateral distance from the geometric axis 18 of the closing shaft 8. Any other solid surface or the like of the door closer housing 3 or 4, for example the mentioned housing face 19 of the door closer 2 (Fig. 2), can also be selected as a reference. Instead of one or more surfaces, special mounts on the housing 3 or 4 can also be used, provided that the

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is connected in a pluggable manner.

If one can therefore detect the position of an adjustable part of the adjustment mechanism 12, in particular the position of the spring plate 11 in relation to, for example, a fixed surface of the housing 3 or 4, from the outside, the closing force can easily be displayed using a suitably designed display device 6 in conjunction with a sensor of the adjustment mechanism. The closing force can then of course be adjusted using this display.

In the embodiment (Fig. 4), a permanent magnet 20 is attached to the spring plate 11 as a sensor, the position of which can be precisely determined without contact through the housing 3, 4 or the cover 7. However, this requires that there are no ferromagnetic parts in the area of this magnet 20. As a result, both the cover 7 and the housing in Fig. 2

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2 - at least in the area of the display device 6 - as well as the display device 6 explained in more detail below or its plate-shaped base body 21 are made of non-magnetizable material. For example, aluminum and similar light metals can be used for the housing and the cover; while plastic is quite suitable for the display device Z ₄ B*.

From Fig. 2 it can be seen that the display device 6 in this embodiment is equipped with two insertion pins 22 and 23 arranged at a distance from one another. However, they are not used in the door closer type 2 shown there. However, it can be seen from this figure that they protrude vertically above the plate surface 24 of the base body 21. If this plate surface 24 rests on the cover 7 of the door closer 1, for example, according to Fig. 2, each insertion pin engages in a not shown insertion receptacle of the relevant door closer housing. This precisely defines the position of the display device 6 in relation to the door closer, and in particular in relation to the sensor 20 located above it. As a result, the display device can be removed at any time and reattached if necessary without causing deviations when reading the closing force. This makes it possible to use the display device 6 not only with this one door closer, but at least with all door closers of this type. In addition, the display device according to Figs. 1 to 4 offers the possibility of being used just as precisely and repeatably on other types of door closers, or more precisely, on door closers with a differently shaped housing.

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This is achieved by attaching at least one stop element
on the display device. In the embodiment, three such stop elements 25, 26 and 27 are provided. Each works with a predetermined stop surface of the door closer 1,2 )

or its housing 3, 4 in such a way that when correctly attached to |

its housing surface or similar adjacent stop element, the display device 6 the desired and for the display of the closing force
correct assignment to the sensor or magnet 20 is present. From Fig. 1

one can see that when using the insertion pins 22, 23 the I

Stop elements 25, 26 and 27 remain unused, i.e. in the case of a '

Floor door closer protrudes upwards. j

The three stop elements 25, 26, 27 are located at the edge of the
base body 21. The stop elements 25 and 26 run parallel to each other, while the stop element 27 is offset by 90° relative to both.
the clear distance between the two parallel stop elements 25 and 26 is approximately the width of the door closer housing at the location provided for the attachment of the display device 6. In this way,
C determines the position of the display device 6 in the transverse direction.

In the longitudinal direction, the precise positional fixation of the display device 6 relative to the housing 2 is achieved by means of the third stop element 27, which is placed against the front end surface 19 of the housing 2. If, for example, the stop element 27
is not provided, you can set the display exactly i

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The alignment of the display device 6 in the longitudinal direction 29 can be achieved by, for example, aligning the front edge 30 of the plate-shaped base body with respect to a mark (not shown) on the associated housing surface. Furthermore, it is easy to see that one of the two stop elements 25 and 26 can be omitted and yet the display device 6 can still be precisely aligned with respect to the housing 3, 4. In this case, however, a corresponding instruction must be given to the user of the display device. This also applies if the stop element 27 is missing. Such an instruction can also be given, for example, in the form of two markings on the housing that are at right angles to one another, which interact with corresponding edges of the base body 21 and which do not allow interaction if they are incorrectly positioned.

The stop elements are essentially strip-shaped. However, they can be designed in a special way according to the example in the drawing *. For example, an inward-facing stop strip 31 or 32 is attached to the top of each of the two stop elements 25 and 26. In addition, the stop elements 25 and 26 have an angular cross-section at both ends, for example due to molded-on extensions 32 and 34, whereby these extensions form one of the angle legs. Their free surface slopes slightly inwards compared to the plate surface 35. This is useful if the associated surface of the door closer housing 4 (Fig. 2) is shaped accordingly. However, it can also be useful

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This may be the case if, for certain reasons, you do not want to support the display device 6 directly on a differently shaped door closer housing surface, for example a flat surface.

The display device 6 is equipped with a display element 36. This interacts with a display scale 37. When executing

In the example, there are five marks 38, each of which is assigned a number. Instead, a scale with corresponding values of the closing force to be read can also be provided. However, the display device can be used more universally with a neutral display scale 37. The latter is elongated, possibly also called the permanent magnet 20, or generally speaking, the movable sensor performs a straight-line movement when the closing force is changed. The marks 38 preferably correspond to the corresponding DIN standard. In addition, the closing moments are specified, which must be present at a closing angle of 90° and 120°.

The indicator element 36 is preferably a transparent tube 39 in which, for example, a magnetized ball 40 is located. This is attracted by the magnet 20 and in this way held in the position which corresponds to the current position of the spring plate 11 and thus also to the current closing force. If, according to Figure 2, the closing force corresponds to the scale value 3, for example, the actual closing force can be determined using an associated table.

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or vice versa, change the closing force by
For example, rotate the rotary axis 16 (Fig. 2) until the

'-- Ball 40 or another display element is assigned to the desired scale value, for example the value "2".

p The display element 40 does not necessarily have to be a sphere, much &mdash;

_ magnetized particles, for example, are also possible,

floating in a liquid in tube 39

They then cluster together at the point that is assigned to the magnet 20. In a very advantageous way, one can

^ such an indicating device, especially with a ball, also known as a spirit level

to align the door closer housing 3, 4.

Instead of a magnet 20, another suitable sensor can of course be used, for example an electrical signal transmitter equipped with a long-life battery. In this case , the display device must be designed as a suitable electrical display device.

The display element 36 is located in an opening in the frame- or plate-shaped base body 23. This has the decisive
Advantage that its display element 40 can be viewed from both sides of the plate
is visible. In order to be able to read or write from both sides.
In order to be able to adjust the closing force, an indicator scale 42 is also attached to the plate surface 35. The scales 37
and 42 do not necessarily have to match* In addition, the distance between scale lines or marks depends on the spring characteristics.

At the

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As already explained, the closing force is usually changed to the intended value using an adjusting tool, as a result of which not only a closing force indicator 6 is needed to adjust the closing force, but also a corresponding adjusting tool. So that both are always to hand, a particularly preferred embodiment of the invention provides that the indicator 6 forms such an adjusting tool on the same side. For this purpose, it is provided with a multi-edge attachment 43, for example a hexagonal cross-section, so that it can be attached to a pin of the corresponding cross-section.

of the closing force adjustment mechanism 12 can be attached. If necessary, both can be connected via a loose intermediate link, if the adjustment mechanism only has a hexagon socket 17 or a receptacle with a different polygonal cross-section and only one polygonal receptacle is provided on the display device 6. Instead of the latter, however, a square or hexagonal pin can also be attached or formed directly on the display device 6.

f Another or additional variant of the invention consists in using the display device 6 as a holder for at least one, but preferably two, different adjustment tools 44, 45, as shown in Fig. 3 of the drawing. For this purpose, the stop element 27 can be designed as a clamping holder for one of these adjustment tools and, if this has a polygonal insertion pin 46, this can be inserted into the same cross-section in

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Insert the multi-cavity holder 43. For the other adjustment tool 44 , the two extensions 33 and 34 of the stop element 26 are expediently formed into clamp holders.

In certain applications, for example with fire doors, the closing force of the lock latch must be precisely matched to the closing force of the door closer. Furthermore, before adjusting the closing force of the door closer, the closing force of the lock latch must also be checked. This is a particular advantage if the display device 6 is provided with or connected to a measuring device for the lock latch closing force (not shown in more detail).

Claims (18)

16 914 B/sta claims 1. Door closer with an adjustable closing force and a closing force display device (6) which consists of a sensor (20) which can be moved by the closing force change and a display unit which interacts with it, characterized in that the display unit is designed as a removable device which is attached to the housing (3, 4). or the like, a display device (6) is designed which can be assigned to a predetermined position of the door closer (1, 2). 2. Door closer with closing force display device according to claim 1, characterized in that the display device (6) and the housing (3, 4) of the door closer (1, 2) are connected via a plug connection. C) bond can be coupled. 3. Door closer with closing force display device according to claim 2, characterized in that the display device (6) has at least one, but preferably two insertion pins (22, 23) or the like and the door closer housing (3, 4) or the like has a number of insertion receptacles corresponding to the number of pins. - 2 - C 4. Door closer with closing force indicator after a few at least one of the preceding claims, characterized in that the display device (6) has at least one stop element (25, 26, 27) which is connected to a stop surface (19) of the door jf closer housing (2, 4) or the like to fix the position. 5. Door closer with closing force display device according to Claim 4, characterized in that the display device (6) has a plate- or frame-shaped base body (21) and at least two, assigned to the edge area, transverse to the plane of the body standing stop elements (25, 26, 27). 6. Door closer with closing force display device according to claim 5, characterized by three stop elements (25, 26, 27), two of which run approximately parallel to one another and the third (27) approximately perpendicular thereto. 7. Door closer with closing force indicator after Claim 6, characterized in that the distance between the two approximately parallel stop elements (25, 26) corresponds approximately to the width of the door closer housing (3, 4) in the measuring range. 8. Door closer with closing force display device according to at least one of claims 5 to 7, characterized in that the two approximately parallel stop elements (25, 26) at least II, ti« partially have an angular cross-section, whereby the
to the round body parallel angle handles (33/ 34) against its
slopes towards the free end. 9. Door closer with closing force indicator, thereby
characterized in that the insertion pin or pins (22, 23) or the like.
point in the opposite direction to the stop elements (25,
26, 27). 10. Door closer with closing force display device according to at least one of the preceding claims, characterized in that the display device (6) has a linear display element (36) which interacts with at least one scale (37). 11. Door closer with closing force indicator according to Annex 1 claim 10, characterized in that the display element (36) is a
transparent tube (39) with a magnetized display element (40) and the door closer sensor is a magnet. j 12. Door closer with closing force display device according to claim 11, characterized in that the display element is a magnetized ball (40), magnetized particles in a liquid. liquid or similar ferromagnetic element, » 13 * Door closer with closing force display device according to claim 10&iacgr; characterized in that the transmitter (20) is designed as an electrical signal transmitter, in particular as a potentiometer and the display element (36) is designed as an electrical display device. 14. Door closer with closing force display device according to at least one of claims 10 to 13, characterized in that the display element (36) is fastened in an opening (41) of the base body (21) and a display scale (37, 42) is located on both sides (24, 35) of the base body (21) at the opening (41). | 15. Door closer with closing force display device according to at least one of claims 5 to 10, characterized in that at least one of the stop elements (25, 26, 27) simultaneously serves as \J Holder for an adjusting tool (44, 45) for the closing force, in particular designed as a clamp holder. 16. Door closer with closing force display device according to at least one of the preceding claims, characterized in that the display device (6) simultaneously forms an adjustment tool for the closing force adjustment mechanism (12) of the door closer (1, 2), in particular at least one polygonal receptacle (43) for a polygonal mandrel of the adjustment mechanism (12) or at least one polygonal mandrel for a polygonal receptacle of the adjustment mechanism. -S-nism (12), 17- Door closer with closing force display device according to at least one of the preceding claims with a closing spring (9), the end of which associated with the closing force adjustment mechanism (12) is supported on a spring plate (11) or the like of the adjustment mechanism (12) which is adjustable in the longitudinal direction of the closing spring, characterized in that the spring divider (11) or the like is provided with a magnet (205), in particular a permanent magnet, or an electrical signal generator. 18. Door closer with closing force display device according to at least one of the preceding claims, characterized in that the display device (6) is provided with a measuring device for the lock closing force.