DE599634C - Firedamp protected switch box - Google Patents

Description

GERMAN EMPIRE

ISSUED ON JULY 6, 1934

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21 c GROUP 27 o *

Voigt & Haeffner Akt.-Ges. in Frankfurt a. M. *)

Firedamp protected switch box

Patented in the German Empire on November 8, 1931

Switching devices that are used in rooms where explosive gases occur can, for example, in mine rooms at risk of firedamp, are trained in such a way that that they cannot be operated with the cap removed. They also have the facility that the cover cannot be ventilated when the switchgear is switched on. So it was proposed to cover the fastening screws for the cover of the switch box by a frame and the fastening element of this To lock the cover frame with the built-in overcurrent switches so that the frame The overcurrent switch can only be removed in the switch-off position. Here were the overcurrent switches by turning or sliding the actuators in brought the release position. Is it a switch box in which several overcurrent switches are housed and should this overcurrent switch from one point for the purpose of locking in the tripping position a great force is required to move all operating handles at the same time to bring it to the switch-off position. Most of the time this is not possible and one is forced to switch off the overcurrent switches individually, whereupon the operating handles in their off position are held by a locking member.

• To make the lock as simple as possible and with little force To obtain simultaneous locking of all overcurrent switches, according to the invention the trigger orgajie and not as before the switching devices blocked. After releasing the cover that covers the cover fastening screws The framework is the switching on of the overcurrent switches as a result of the movement of their tripping devices during the release in the release position or the locking of their shift linkage made impossible, for which only a small amount of force is required. After removing the cover, the operating levers can of course be used overcurrent switches equipped with trip-free release can be operated. However, it cannot be switched on because the trigger organs are are in the release position.

One of the possible embodiments of the invention is shown in the figures. Fig. 1 and 2 show several overcurrent switches in a common switch housing in two views. In Fig. 3 and 4 the peculiar locking between the housing cover and overcurrent switch is shown, α is the switch box with its cover b. c are the overcurrent switches built into the box, which are actuated by the switching element d attached to the box cover, e are the fastening screws for the cover b,

*) The patent seeker indicated the following as the inventors:

Friedrich Schoof in Eppstein, Taunus, and Martin Oskar Estler in Frankfurt a. M.

ever »

which are covered by the frame f . The frame / 'is mounted like a hinge at g , and on the opposite side it is attached by the tongue h. The tongue h is locked by means of two interlocking, manually operated disks i and k (Figs. 3 and 4). A bolt I is attached to the disk i , which rotates in an opening in the tongue h and holds the tongue h in the position shown. If the disk i and thus the bolt / is rotated by 90 °, the tongue h can slide past the bolt / by means of a cutout provided on it. A rotation of the disk i is not possible during operation due to the engagement with the disk k. Only when the latter is turned so far that its recess m exposes the disk i can the tongue h be given by turning the wedge / free. When the disk k is rotated, a lever arm η attached to it is rotated, which moves the levers ρ via a linkage 0 , which bring all the armatures of the overcurrent switches c into the release position ^a 5 and thus make reconnection impossible. After the tongue h has been pulled out of the bolt / a resilient tongue q is released which surrounds the bolt / in a frame-like manner and holds it in its position so that it is impossible to actuate the disks i and Ii.

In Figs. 1 and 2, the switch box is shown operationally closed. If the box is to be opened, all armatures of the overcurrent switch c are brought into the release position by turning the disk k and at the same time the disk i is released for rotation. By turning the disk i and the bolt / firmly attached to it, the tongue h is released and the frame / can be removed. At the same time, by turning the disk i, the disk k is locked against turning. Here, the spring q slides over the bolt / and prevents further actuation of the disk i. Since the disk k is blocked by the disk i , it is impossible to switch when the frame / is removed, and the cover screws e can be loosened without danger.

Claims (2)

Patent claims: r. Firedamp-proof switch box for accommodating one or more Installationsüfeerstromschalters, in which the fastening screws for the cover of the switch box are covered by a frame and the fastening element of this cover frame and the built-in overcurrent switch are locked together, characterized in that after releasing the cover fastening screws (e) covering the frame (/) the switching on of the overcurrent switches (c) is made impossible as a result of the movement of their release elements into the release position or the blocking of their switching linkage during the release. 2. Firedamp-proof switch box according to claim 1, characterized in that the locking between the holding member Qi) for the cover (/) of the fastening screws iß) and the overcurrent switches (c) by zAvei engaged, manually operated discs {i, Ii ) , of which one (j) is firmly connected to a bolt (/) which only releases the retaining element Qi) of the cover (J) when the other disk Qt) is rotated by means of transmission elements (n, 0, p ) the tripping elements of the overcurrent switch (e) are brought into the tripping position, whereby a recess (m) in the disc (/ e) allows the rotation of the first disc (i) and thus the movement of the bolt (/) into the release position. 1 sheet of drawings