Attachment for musical wind operated instruments

Claim 2

An attachment for a musical wind instrument, such as trumpet or the like which has a bell-type end, comprising a hollow body having rigid side walls and two unobstructed open ends, one end adapted to fit within the bell-type end of the trumpet, a stethoscope having membrane means and two earpieces, said membrane means being positioned within the hollow body between the ends of said body, said earpieces being located externally of said body, the internal volume of said body not occupied by said membrane means being filled with air-permeable acoustically damping material.

Claim 3

Attachment as claimed in claim 1, in which the hollow body is of cylindrical shape and on which a plurality of fastening means are provided, each fastening means being elastically extensible, being disposed on an outer surface of the hollow body and being provided with a respective hook for the releasable connection of the hollow body to the bell-type end of the wind instrument.

Claim 4

An attachment as claimed in claims 1 or 2, in which the hollow body is provided with a sealing rim around the aperture of the hollow body to be adjacent the bell-type end of the wind instrument, the sealing rim comprising an elastomer.

Claim 5

An attachment as claimed in claims 1 or 2, in which the aperture of the hollow body adjacent the bell and the lower aperture of the cylindrical hollow body are each closed by a felt disc, said discs being permeable to air and having disposed therebetween a third and similar felt disc which supports the membrane of the stethoscope, and filler layers of open cell polymeric rigid foam material, open cell flexible polymeric foam material and open cell polymeric foam material.

Claim 6

An attachment as claimed in claims 1 or 2 further comprising air exit hole in the wall of the hollow body.

Claim 7

An attachment for a musical wind operated instrument, such as a trumpet or the like, comprising a hollow cylindrical body having unobstructed open ends and shaped such that an open end thereof may be brought into sealed communication with the bell of the instrument, means for securing the hollow cylindrical body to the bell of said instrument, a first permeable felt disc closing the opening of the hollow body to be adjacent the bell of said instrument, a second permeable felt disc near the opposite opening of the hollow cylindrical body and a third permeable felt disc dividing the hollow cylindrical body into two chambers, a stethoscope having a membrane, said membrane mounted within a first chamber, said first chamber lying between the first and third discs, permeable open cell polymeric foam completely filling said first chamber, permeable open cell rigid polymeric foam adjacent the second felt disc partly filling the other chamber between the second and third felt discs within the hollow cylindrical body, and permeable open cell flexible polymeric foam material completely filling the remainder of the other chamber between the rigid foam and third disc.

Claim 8

An attachment for a musical wind operated instrument, such as a trumpet or the like, comprising a hollow cylindrical body having unobstructed open ends and shaped such that an open end thereof may be brought into sealed communication with the bell of the instrument, means for securing the hollow cylindrical body to the bell of said instrument, a first permeable felt disc closing the opening of the hollow body to be adjacent the bell of said instrument, a second permeable felt disc near the opposite opening of the hollow cylindrical body and a third permeable felt disc dividing the hollow cylindrical body into two chambers, a stethoscope having a membrane, said membrane mounted within a first chamber, said first chamber lying between the first and third discs, permeable open cell polymeric foam completely filling said first chamber, permeable open cell rigid polymeric foam adjacent the second felt disc partly filling the other chamber between the second and third felt discs within the hollow cylindrical body, and permeable open cell flexible polymeric foam material completely filling the remainder of the other chamber between the rigid foam and third disc.