DE93821C - - Google Patents

Description

oca υχ; ΛϊΜΧ '

ίάκΛι

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 24: Combustion systems.

Draft regulator.

Patented in the German Empire on January 12, 1897.

The subject of the present invention is a device of a simple type, with the aid of which the supply of the secondary combustion air behind the fire bridge is initiated every time the fire door is opened and automatically again after the door is closed, depending on the progress of the combustion and the associated decrease in smoke development is interrupted by opening the flap allowing air to enter behind the fire bridge by the shaft d ¹ , which is set in rotation by means of the fire door itself, while the closing of the same is done by a spring causing the shaft to move back.

Fig. Ι shows the position with the fire door closed,

Fig. 2 the same with the fire door open.

The fire door α can be rotated about hinges in the usual way. Above the horizontal plane, which describes the lowermost edge of the fire door α as it moves, a curved lever b protrudes, which swings around a hinge b ¹ and is held in the raised position by a spring h ¹ fastened in h. At this lever b, at g ^{2, there is} a handlebar which is coupled by a pin g ¹ to a second lever d firmly connected to the shaft d ^1. A piston brake is switched on between the ends b ² and d ^{% of} the levers b and d , the cylinder / of which is movably attached ^{to the piston rod e 1} in b ^{2 by means of a hinge / 1} in d ² and the piston e with the aid of an eye. The pivot points b ^l and d ^l are rigidly connected by a plate c. If the fire door is now opened, the lever b is depressed by the lower edge thereof (FIG. 2), the spring h ^{1 is} tensioned and, by means of the handlebar, the lever d is also moved downwards. As a result, the ends b ² and d ' ^{2 of} the two levers b and d diverge from each other, and the piston e is moved upwards in the cylinder / through the brake fluid. If the door is now closed again, the spring h ^{1 has to} take care of the return movement of the lever b and thus of the lever d . At the same time, however, the lever ends approach each other again during the upward movement, since both levers are connected to one another by means of a link, so that the piston e in the cylinder / must be driven downwards. The spring h ¹ therefore also has to overcome the braking pressure of the liquid in the cylinder /, which can be regulated from the outset according to the fuel by pouring in a thinner or thicker liquid. The rotation of the shaft d ¹ now effects the opening and closing of the air flap for supplying the secondary air behind the fire bridge by means of a simple lever, and the movement of the flap will therefore correspond exactly to the movement of this shaft d ¹ .

Claims (1)

Patent claim: Device for regulating the secondary air supply operated by the fire door, characterized in that one, b, of two levers b and d, is depressed when the fire door is opened and around a fixed point b ¹ , the other, d, on the other hand with a shaft d ¹ is rotatable, while both, connected to one another by a link g , are moved upwards by means of the spring h ^l acting on b , a fluid brake switched on between their ends b ^z and d ² slowing down the return movement. For this purpose ι sheet of drawings.