Edge sealing means in a sound-absorbing cover for use in a sound-emitting body

Adjustable packing strips (3, 4) are held on the inside of a carrying sheet (6) covered with sound-absorbing material (5), and are slidable by adjustment elements (7, 9), which can be actuated and fastened from the outside, within an adjustment chamber isolated against the sounds of a sound-emitting body (2) to project the packing strips beyond the peripheral edge (6A) of the carrying sheet (6).

BACKGROUND AND SUMMARY OF THE INVENTION 
The invention relates to an edge sealing means in a sound-absorbing cover 
for use in a sound-emitting body. 
When using packing strips of the type which are to be screwed down onto a 
sound-emitting body, excessive tightening of the bolts during assembly can 
result in body sounds reaching into the sound-absorbing cover and from 
there to the outside. This may occur in spite of the use of an elastic 
covering. 
The primary objective of the present invention is to provide an edge 
sealing means in a sound-absorbing cover of the above described type, in 
which sound bridges from the equipment through the covering and to the 
outside are avoided in a simple manner. The cover of the invention 
achieves its objective while being securely mounted to the sound emitting 
body yet readily detachable when desired. Generally, the invention 
comprises an edge sealing means in a sound-absorbing cover of a 
sound-emitting body. Elastic sealing materials in the form of strips are 
arranged for outward expansion about the outer phiphery of a carrying 
sheet which is covered on the inside with a sound absorbing material. 
Cooperating adjustment elements are fastened within a sound insulated, 
adjustment chamber and are actuatable from the outside of the 
sound-absorbing cover after mounting upon the sound-emitting body to 
expand the packing strips beyond the phipheral edge of the carrying sheet 
and into engagement with the sound-emitting body to secure the cover upon 
the body. 
For a better understanding of the above and other features and advantages 
of the invention reference should be made to the following detailed 
description of a preferred embodiment of the invention and to the 
accompanying drawing.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION 
In a recess of a sound-emitting body 2 bounded by planar walls arranged in 
a rectangle, a sound-absorbing cover 1 is located, the contours of which 
are adapted to conform to the contours of the recess with a relatively 
small continuous edge interspace provided for the ready insertion of the 
cover 1. 
The cover 1 consists of a planar rigid carrying sheet 6 with peripheral 
edges 6A. The carrying sheet 6 is covered on its inside with sound 
absorbing material 5. In the opposing edge regions perpendicular to the 
plane of drawing is an abutment 10 with a sliding plane 10B oblique with 
respect to the carrying sheet plane and a bearing surface 10A fastened at 
the inside of the carrying sheet, forming an angle with the sliding plane 
10B and extending to the edge 6A. The abutment 10 braces itself as an open 
hollow profile on the other side of the inclined sliding plane 10B against 
the carrying sheet 6 and is equipped at the upper end of the oblique 
sliding surface 10B with a boundary wall 11 to define an adjustment 
chamber 8. The adjustment chamber 8 is built toward the edge 6A and 
includes a guide surface 11A parallel to the carrying sheet for a packing 
strip 3, 4. The packing strip consists of a rigid strip 3 open toward the 
edge 6A with U-shaped section. Mounted within the strip 3 is an elastic 
resiliant sealing material 4 which is arranged to project beyond the side 
of the strip 3. 
As defined by the boundary wall 11 and the abutment 10, the adjustment 
chamber 8 is free of the sound absorbing material 5, and houses a 
wedge-shaped adjustment element 7. The adjustment element 7 is arranged 
with an oblique face against the inclined plane 10B and with its opposing 
face directed perpendicular to the plane of the carrying sheet 6 and 
against the back of the packing strip 3. Through an opening in the 
carrying sheet 6, a tension bolt 9 is screwed into the adjustment element 
7. Upon being screwed into the adjustment chamber 8, the tension bolt 9 
displaces the threadedly engaged adjustment element 7 along the slide 
surface 10B towards the edge 6A and in the process causes the packing 
strip 3, 4 to be displaced beyond the edge 6A and into engagement with the 
side walls of the body 2. Due to elastic deformation of the resilient 
material 4--an edge sound-absorbing clamping connection which holds the 
cover 1 securely is ensured, which can again be released when the tension 
bolts 9 are unscrewed. 
The above description of a preferred embodiment of the invention is meant 
to be representative only as certain changes may be made therein by those 
skilled in the art without departing from the clear teachings of the 
invention. Accordingly, reference should be made to the following appended 
claims in determing the full scope of the invention.