DK148603B - TRANSMISSION MECHANISM FOR OPENING AND CLOSING OF EXAMPLE LIGHT OR SMOKE VALVES - Google Patents

Description

148603

The present invention relates to a trigger mechanism for systems for opening and closing, for example, skylights or smoke flaps by means of a gaseous pressure means.

In known systems, the trigger mechanism is usually controlled either manually, electromagnetically or thermally. Manually controlled mechanisms are of little practical use because triggering can only be done in one place. The essential advantage of electromagnetic control is that the trigger can be triggered from anywhere, but when the power supply fails, no triggering is possible. The thermal release is preferably done using glass flasks which are crushed by the heat effect.

The object of the invention is to provide a trigger mechanism for plants of the kind in question and which mechanism is universally activatable, ie. controllable, either manually, electromagnetically or thermally.

This is achieved according to the invention in the embodiment of claim 1.

In this embodiment, it is firstly achieved that the three known types of trigger mechanism can be replaced by one and the same construction. This provides simpler and cheaper manufacturing (and inventory management). Secondly, for the operational safety of many gaseous pressurizing plants, it is advantageous that they can be triggered not only by heat, but also manually (on site) or (from another location) electromagnetically.

BRIEF DESCRIPTION OF THE DRAWINGS In the following, the invention will be explained in more detail in connection with the drawing, in which Fig. 1 shows a section through a release mechanism according to the invention in standby mode, Fig. 2 a section along line II-II in Fig. 1, Fig. 3 shows the part of the mechanism shown in Fig. 2. from the right in Fig. 2, but slightly modified, and Fig. 4 the same from above.

In Figure 1, a bottle 2 is provided on a carrier plate 1 containing a non-combustible gas, preferably compressed carbon dioxide. By means of a tightening screw 3, the mouth of the bottle is pressed tightly against a packing ring 4. To open the bottle '2, a pipe needle 5 is used in known manner. is attached to a piston 6. The piston 6 is axially slidably mounted in a bore 11 in the carrier plate 1 and, via a bore not shown, can be connected to a pipeline.

In a second bore 12 extending across the piston bore in the support plate 1 is arranged a guide piston 8 which is continuously actuated by a biased screw pressure spring 9. The spring 9 rests against a bushing 10 fixed to the plate 1.

On the center of the guide plunger 8 is a cone-shaped notch. At the standby position shown in Fig. 1, in this incision 81, a ball 7 »is placed in the bore 11 behind the piston 6. If the spring 9 is allowed to push the piston 8 upwards in Fig. 1, the ball rolls along the inclined piston surface 81 and displaces needle tube 5 into the bottle 2. This escapes the contained gas and does not activate the mechanisms shown which open or close, for example, skylights or smoke flaps.

Also attached to the support plate 1 is a guide body 13 having a bore 14 in extension of the piston bore 12.

In the bore 14 of the guide body, a pressure member 15 is axially displaceable. Above the bore 14 is mounted in the guide body a rocker arm 16, which is pivotable about a transverse pin 17 and via two eyelashes 18 jointed with the pressure member 15. The rocker arm 17 and the lugs 18 together form a knee joint.

The movement capability of the rocker arm 16 is limited in one direction by a pin 19, so that the pivot pin 20 of the lugs 18 fixed in the arm 16 can be pivoted slightly outside of the line 21 which extends through the transverse pin 17 and a pin 21 located in the pressure member 15 .

The piston 8 and the pressure member 15 have in the end faces facing funnel-shaped bores 82 and 151, respectively, which serve to clamp a heat-sensitive glass flask 22.

Underneath the rocker arm 16, an electromagnet 23 is attached to the support plate 1, whose shock bolt 24 in the cupboard position (Fig. 1) reaches near the underside of the rocker arm 16. When the magnet 23 is actuated, the shock bolt 24 is guided against the rocker arm 16, which is rotated 3 in the direction A of the arrow. As the pivot pin 20 thereby reaches past the line a, the biased spring 9 causes the knee joint 16,18 to break, thereby moving the piston 8 so much that the pipe needle 5 opens the gas bottle 2.

By a heat effect, the glass flask 22 is destroyed and this also allows the spring 9 to move the pistons 8 and 6 so that the gas bottle 2 is opened.

Finally, the rocker arm can be moved manually in the direction of arrow A so that the gas bottle 2 is opened.

After triggering and possibly inserting a new glass flask 22, the mechanism can be put back into the standby position by swiveling the rocker arm 16 manually manually to the initial position and inserting a new gas bottle 2.

The embodiment shown in Figures 3 and 4 differs from that shown in Figures 1 and 2 in that the stop pin 19 of the rocker arm 16 is replaced by an adjustable stop in the form of a screw 25 in a transverse thread bore. This design makes it possible to adjust very accurately so that release takes place even with very little movement of the shock bolt 24 of the electromagnet.