DK142426B - MECHANISM FOR ATTENDANCE DIMENSION - Google Patents

Description

(11) PUBLICATION NOTICE 1 * 4-2426 (wi \ r & / DENMARK, 5 ', Ιη, αΊ S2h il /? O (21) Application No 2169/76 (22) Filed on 17 * May 19 ^ 6 ffgj (24 ) Running Day 17 · May 1576 (44) The application submitted and the writ of publication published on 27 * OlCfc. 1 9o0

Dl THE RECTORATE FOR

PATENT AND TRADE MARKET (30) Priority requested from it

15 · Apr. 1976, 2616899, DE

(71) FRIEDRICH MAURER SOEHNE, Frankfurter Ring 195 * 8000 Muenchen 44, DE.

(72) Inventor: Christian Petersen, Gutenbergstr. 1, 8012 Ottobrunn bei Muen = chen, DE.

(74) Plenipotentiary in the proceedings:

Th. Ostenfeld Patentbureau A / s.

(54) Vibration damping mechanism.

The present invention relates to a mechanism for vibration damping in slender structures, such as chimneys or transmitter masts, and, moreover, of the type specified in the preamble of claim 1.

In a mechanism known from German patent specification 1,559,243 of this type, the damping device consists of an oil-filled container in which a pendulum is submerged. By maintaining a certain viscosity of the oil, for example by means of a suitable temperature control, it is thus possible to set the degree of damping to a certain value obtained by prior experimentation.

In this known pendulum mechanism and also in a similar mechanism known from East German patent 69.191, the energy conversion takes place according to the principle of liquid friction. Hereby it is inconvenient that the frictional forces can only be determined empirically, ie. due to prior experiments, thereby making the design of such mechanisms considerably complicated and costly. In addition, maintenance requires a constant viscosity, which is a prerequisite for a certain frictional damping, relatively high cost and shuttle mechanisms of the particular type working with fluids also results in sealing and maintenance problems.

In addition, German German Patent Specification 1,227,633 discloses a vibration damper in which a damper body rests freely slidably between abutments on a fixed part of the structure blinded by the construction. The energy conversion takes place here by friction between solid bodies, and in addition to the damper body sliding uncontrollably on its substrate, an accurate tuning of the vibrations of the structure cannot be performed or predetermined in practice, since any change of the damper body simultaneously results in a change in the frictional conditions.

The object of the present invention is to provide an oscillation damping mechanism of the current type in which a pendulum-shaped body performs the energy conversion in a predictable manner and, moreover, in such a way that on the one hand an adaptation of the pendulum criteria to the vibrations of the structure and on the other hand an adjustment of the damping force which determines the energy conversion can be carried out independently.

This is achieved with the properties of the mechanism according to the invention set out in the characterizing part of claim 1. By changing the displaceable body, the damping force can then be adjusted independently of the pendulum geometry. This will allow the calculation of the oscillation problems occurring. Already at the design stage, the frictional force can be selected therein so that the pendulum impact assumes an optimal value with a damping efficiency which is improved in relation to the principle of liquid friction. According to the invention, this is done in a simple way by reconciling the two bodies one after the other.

Furthermore, the mechanism of the invention is substantially less susceptible to interference than known fluid friction mechanisms. Unattended, the mechanism of the invention enables the maintenance of constant frictional conditions, and the energy converted to friction is constant throughout the friction path, thereby obtaining a damping efficiency which is improved over known mechanisms.

Due to the simple mechanical device, the mechanism of the invention is extremely insensitive to weathering, and since the frictional force causing the damping effect is at all times directed against the pendulum movement, a single damping device is sufficient. The whole mechanism can thus be built extremely compact, so that it has only a very small wind attack surface.

In a preferred embodiment of the mechanism according to the invention, the damping device consists of several stackable plates on a base plate. Thus, the degree of damping can be controlled not only by inserting different friction coatings on the friction surface, but also by changing the number of plates in the damping device.

In the following, the invention will be described in more detail from one embodiment and with reference to the drawing, in which figure 1 shows a section through an embodiment of the mechanism according to the invention, figure 2 a section taken along line II in figure 1, figure 3 Figure 4 is a plan view of one embodiment of a plate; and Figure 4 is a force / road diagram.

As can be seen in Figure 1, a housing 1 for the anti-vibration device is fixedly located at the upper end of a chimney 2. From the housing side 3 of the counter-chimney tube 2, a collar bolt 4 projects into the interior of the housing in the radial direction of the chimney. At the outer end of the bolt 4, a ball joint 5 is arranged on which a pendulum rod 6 is mounted. Due to the ball joint 5, the pendulum rod 6 can perform pendulum movements in the room. To control the pendulum swing there are arranged pendulum body segments 7 which can be inserted into the pendulum rod 6 and fixed on the rod 6 by means of nuts 8.

The lower end of the pendulum rod 6 loosely engages an opening 9 in a damping joint 15 consisting of plates 11 superposed on a base plate 10. The base plate 10 and the plates 11 are preferably circular, but any other cross-sectional shape is also possible. The precisely centered position of the individual plates 11 is secured by pins insertable in the base plate 12. The base plate 10 is provided with a friction coating 13 possibly serving as a smoothing plate 14. The contour of the base plate 14 preferably consists of a rectangle and adjacent to one of the rectangle sides. a semicircle meets the rectap gel side as a diameter (Figure 2). If the pendulum rod 6 is applied to oscillations, the damping joint 15 of the base plate 10 and the stacked plates II formed thereon will be forcibly moved over the base plate 14 by means of the pendulum rod 6 projecting into the opening 9, thus damping the pendulum swing due to the frictional effect between the damping joint 15. and the friction coating 13.

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The pivotal movement of the shaft rod 6 can be regulated by changing the number of pendulum body segments 7 applied and the magnitude of the damping degree of the mechanism can be quickly and simply controlled by changing the friction mass, ie by applying or removing a plurality of plates 11.

In order to prevent damage to the friction mass plates 11 or other components of extreme pendulum rails, stop 17 is arranged at the side walls of the housing, which is suitably formed of a shock-absorbing and resilient resilient material. The abutment or spacer may, of course, also be disposed on the damping link 15 itself, rather than on the side walls of the housing. For venting and for removing any accumulated water on the base plate 14, a number of bores 16 are provided in the base plate 14. The plate housing 1 closed on all sides may be suitably reinforced by ribs 18.

Figure 3 shows an embodiment of a circular plate 11.

For example, the aperture arranged in the center of the plate 11 has a slot extending towards the plate edge in the radial direction, thereby greatly facilitating the application or removal of the plate. A disassembly of the pendulum rod 6 or the damping link 15 is thus no longer necessary, but on the contrary the plates 11 can be inserted at any time on the damping link 15 against the pendulum rod 6, whereby the plates can be held in the correct position by the pins 12. For example, the plates 11 need only to be lifted relative to the pins 12, after which the plates can be easily removed from the shaft rod 6.

However, although the damping link 15 may be coupled to the pendulum rod 6 as in the illustrated embodiment, the damping link 15 may also be constituted by the pendulum rod 6, for example by its lower section. In this case, for example, the fixed friction surface is assigned a spherical shape corresponding to the pendulum length, whereby the damping properties can be changed by means of different and easily insertable friction coatings on the base plate 14 or the pendulum rod 6.

However, the pendulum rod 6 may also be mounted so on the ball joint 5, possibly in a socket welded to the ball joint 5, that the pendulum rod is movable in the axial direction. In that case, it is no longer necessary to design the friction surface cooperating with the pendulum rod 6 spherical, but the surface can be kept flat or have a suitable other surface shape. At the same time, of course, a friction plate may be connected to the lower end of the pendulum rod 6 to increase friction.