DE1234532B - Clamping device for window frames of respiratory masks - Google Patents

Description

GERMAN #IW PATENT OFFICE

German class: 61 a-29/13

EDITORIAL number: 1234532
File number: D 40908 V / 61 a

J 234 532 filing date: February 16, 1963

Opened on: February 16, 1967

To hold the window panes of respiratory masks, it is known to use clamps, which usually consist of two curved parts, through the bent ends of which tension screws are plugged. The clamps grip the rubber bead on the respirator the lens mount. This type of fastening makes it possible to remove the window panes for maintenance or to exchange for others. However, the known clamps have the disadvantage that the train is only transferred to the clamp itself and not the direction of pull of the tensioning device is adapted to the curvatures of the sealing line for the disc. This is particularly disadvantageous when the disc is curved.

There is also a version for the window panes of respiratory masks or the like. Known, which consists of a frame made of elastically resilient, which surrounds the panes on both sides on their circumference Building material. The front frame edge intended for reaching over the outside of the window pane is inclined too conically towards the inside of the socket when the disc is not inserted, so that it after inserting the window pane it is in contact. To improve the seal, a clamping ring can be used be placed the socket, which is U-shaped in cross section and both the front and the encompasses the rear edge of the socket. The clamping ring is open in at least one point. He can be self-resilient be or have a locking device at the open point. If the tension ring exists z. B. from two retaining rings, these can be articulated with a wire loop. For this purpose, eyes are attached to the ring halves, into which the wire loop engages. On the other On the side, the clamping ring halves are connected to one another with a union. The throw is on the one side hinged to one eye on one ring half and on the other side via a head pin placed on the other half of the snap ring. If in this training the wire loops are not immediately are attached to the ends of the clamps, but further back, there is a risk of that the wire loops slip off the side of the clamps so that the clamps do not are pressed at their ends radially against the center of the discs.

The invention relates to such a tensioning device for window frames of respiratory masks, which has tensioning clamps connected to one another with flexible tensioning means. It is based on the task of this jig to ver-jig for window frames
of respirators

Applicant:

Drägerwerk, Heinr. & Bernh. Dräger,
Lübeck, Moislinger Allee 53/55

better that the most even pressure possible is exerted on the entire circumference of the edge of the window pane to be clamped. The solution is that between the interconnected clamps one or more intermediate clamps are arranged, the total length of which is greater than the distance between the clamps and with guide means for guiding a tensioning means forming pull rope, pull wire or the like. Are provided, and that the opposite ends of the clamps and / or intermediate clamps are bent or drawn in such that the clamps can be displaced one above the other. The invention has the advantage that the clamps and the intermediate clamps do not rise from the rubber edge to be clamped and adjust themselves in the correct position when tensioning, whereby a uniform pressure is exerted on the edge of the window pane over the entire circumference. This is also achieved if the clamps are not in one plane over the entire circumference. Furthermore, the assembly of the clamping device is easy.
In an advantageous embodiment, the tensioning means is tensioned with a turnbuckle fastened to one of the clamps, which can be designed as a worm drive. This has the further advantage that the tension of the clamps can be adjusted. The tightening of the clamping means can also take place gradually, with the intermediate clips being held in the correct position.

Further features of the invention are the subject matter of claim 4.
Exemplary embodiments are explained with reference to the drawing. It shows

A b b. 1 shows the arrangement of the clamping device on a breathing mask in a rear view,

Fig. 2a is a longitudinal section of a clamping device in which the clamping means on the top of the Clamps are arranged,

From b. 2b the top view of the top and
A b b. 3 shows a cross section.

709 509/46

Claims (4)

When executing the clamping device according to A b b. 2 and 3, the mask body (not shown) is provided with a rubber bead 2 for receiving the window pane 3. The rubber bead is approximately U-shaped in cross section and surrounds the edge of the window pane. U-shaped clamps are placed over the rubber bead. The clamp 4 carries on its upper side 5 a a tab 5 b provided with a bore, in which a screw 7 is held, which has a screw-head-like edge 8 for turning. The screw is covered by a sleeve 9. On the upper side 10 of the clamp 6, a pull rope 11 is attached, the other end of which, designed as an eyelet 12, is placed around the hook-shaped end 13 of a slide 14. This is arranged between the screw 7 and the top 5 a. It is guided by an opening in the tab 5 b and the side walls of the sleeve 9. The upper side of the slide is provided with toothed rack-like ribs 15 which run obliquely to its direction of movement and in which the worm 7 engages. Between the clamps 4 and 6, an intermediate clamp 5 is mounted, the ends 17 and 18 of which are bent so that they overlap the opposite ends of the clamp 4 and 6. Furthermore, the intermediate clip 5 is provided with a guide eyelet 19, produced for example by punching, in the central part and guide eyelets 20 and 21 at its end parts. The pull rope 11 is guided through this. When the worm 7 is tightened, the pull rope 11 is tensioned, the clamps being pulled against each other. Even with the relatively strong curvature shown, the edge of the window pane 3 is evenly tensioned over its entire circumference. In the embodiment according to Fig. 1, in which the mask 1 is shown in a rear view, the pull rope and the tensioning device 27 are not on the top of the clamps 4 and 5, but on the sides 28 of the clamps 4 and and the intermediate clamp 5 arranged. This has the advantage that the clamping means do not protrude beyond the edge of the mask, but are located behind the edge of the mask. The guide eyelets ensure that the clamping devices are properly guided. Patent claims: 1. Clamping device for window frames of respiratory masks, which has clamps connected to one another with flexible clamping means, characterized in that one or more intermediate clamps (5) are arranged between the connected clamps (4 and 6) , the total length of which is greater than the distance between the clamps and which are provided with guide means for guiding a pull rope (11), pull wire or the like forming the tensioning means, and that the opposite ends (17 or 18) of the clamps (4 and 6) and / or intermediate clamps (5) in such a way are cranked or retracted that the clamps can be shifted one above the other. 2. Clamping device according to claim 1, characterized in that the clamping means are tensioned with a turnbuckle fastened to one of the clamps (4). 3. Clamping device according to claim 2, characterized in that the turnbuckle as Worm drive is formed. 4. Clamping device according to claim 3, characterized in that the counterpart of the screw (7) consists of a between the screw and the clamp (4) displaceable in the longitudinal direction of the slide (14) on its side facing the screw (7) at an angle to Direction of movement extending ribs (15) is provided. Considered publications:
German patent specification No. 472 739. 1 sheet of drawings 709 509/46 2.67 ® Bundesdruckerei Berlin