Detachable elastomer muffler for pneumatic percussive tools

Claim 2

In a pneumatic tool having a cylinder section provided with exhaust ports through which spurts of air spent in reciprocating a piston rapidly and forcefully issue, a one-piece noise muffler formed of resilient flexible material detachably mounted to the cylinder section of the tool defining with the outer surface of the latter a pair of sound filtering chambers, the area of contact of the muffler with the cylinder section being fluid tight, the exhaust ports being of equal area dimension and opening into one of the chambers, ports corresponding in number and area dimension to that of the exhaust ports connecting the one chamber to the second chamber, a discharge port from the second chamber corresponding in area dimension to that of an exhaust port, so that exhaust air flow from the exhaust ports through the pair of chambers to the discharge port is without consequent back pressure, and the chambers being unequal in volume and length, so that each chamber differs in its design sound wave frequency from that of the other.

Claim 3

A pneumatic percussive tool having a cylinder section provided with exhaust port means through which spurts of air spent in reciprocating a piston rapidly and forcefully issue, a one-piece noise muffler having a C-configuration formed of elastomeric material detachably mounted to the cylinder section defining with the outer surface of the latter a sound filtering chamber system into which the exhaust port means opens, the chamber system having an exhaust air discharge port means connecting the chamber system with atmosphere, wherein means is provided for detachably clamping the muffler to the tool in such manner that its perimetric edges are in fluid tight contact with the surface of the cylinder section of the tool.

Claim 4

A pneumatic percussive tool having a cylinder section provided with exhaust port means through which spurts of air spent in reciprocating a piston rapidly and forcefully issue, a one-piece noise muffler having a C-configuration formed of elastomeric material detachably mounted to the cylinder section defining with the outer surface of the latter a sound filtering chamber system into which the exhaust port means opens, the chamber system having an exhaust air discharge port means connecting the chamber system with atmosphere, wherein means is provided for detachably clamping the muffler to the tool in such manner that its perimetric edges are in fluid tight contact with the surface of the cylinder section of the tool.

Claim 5

A pneumatic percussive tool as in claim 2, wherein the cylinder section includes a radial rib along its back and an adjacent curved forward portion through which the exhaust port means opens, the muffler has a curved wall portion collaring the curved portion of the cylinder section and has a pair of free end walls clamped to opposite faces of the rib.

Claim 6

A pneumatic percussive tool as in claim 3, wherein the muffler has top and bottom walls offset radially from corresponding ends of its curved wall portion, the top and bottom walls each having an inner radiused axially extending narrow wall in conforming contact relation with the curved forward portion of the cylinder section.

Claim 7

A pneumatic percussive tool as in claim 4, wherein the cylinder section has upper and lower radial flat shoulders lying respectively in backing relation to the top wall and the bottom wall of the muffler so as to support said top and bottom walls from being blown resiliently outwardly relative to the muffler under force of exhaust air entering the muffler.

Claim 8

A pneumatic percussive tool as in claim 4, wherein the inner radiused axially extending narrow wall of the top wall of the muffler has a depending lip tapered toward the curved forward portion of the cylinder section and resiliently pressed upon the latter, and wherein the radiused axially extending narrow wall of the bottom wall has an upwardly extending lip tapered toward the curved forward portion of the cylinder section and resiliently pressed upon the latter.

Claim 9

A pneumatic percussive tool as in claim 3, wherein a bead portion is formed vertically of each of the free end walls and is resiliently pressed against the corresponding face of the rib.

Claim 10

A pneumatic percussive tool as in claim 4, wherein a partition wall is offset radiallY from the curved wall portion of the muffler in axially spaced relation between the top and bottom walls and has a inner radiused axially narrow wall engaging the curved wall portion of the cylinder section of the tool so as to define an upper chamber and a lower chamber for the muffler.

Claim 11

A pneumatic percussive tool as in claim 8, wherein the exhaust ports of the tool open radially into the upper chamber, the upper chamber communicates with the lower chamber by means of a pair of openings through the partition wall at opposite ends of the upper chamber, each opening being defined in part by a vertical wall portion of the muffler and in part by a wall portion of the cylindrical section of the tool.

Claim 12

A pneumatic percussive tool as in claim 9, wherein the length of one chamber relative to that of the other is in the ratio of 2:1.

Claim 13

An elastomer muffler unit for the exhaust of a pneumatically percussive tool, comprising a one-piece curved body of C-configuration having an outer curved side wall, a top wall offset radially from the upper end of the sidewall, a bottom wall offset radially from the lower end of the sidewall in parallel relation to the top wall, and having an intermediate wall offset radially from the sidewall between the top and bottom walls, the several walls terminating at opposite ends in a pair of spaced opposed common vertical end walls each having a broad inner face in opposed relation to the other and each having an inner vertical sidewall, a notch formed in one end of the partition wall having as one edge thereof the inner vertical side of one end wall, and a similarly formed notch in the opposite end of the partition, each of the radial walls having an inner radiused wall adapted to engage about a complementary surface of a pneumatic tool, and the vertical end walls being adapted to be detachably mounted to opposite faces of a back rib of the said tool.

Claim 14

An elastomer muffler unit for the exhaust of a pneumatically percussive tool, comprising a one-piece curved body of C-configuration having an outer curved side wall, a top wall offset radially from the upper end of the sidewall, a bottom wall offset radially from the lower end of the sidewall in parallel relation to the top wall, and having an intermediate wall offset radially from the sidewall between the top and bottom walls, the several walls terminating at opposite ends in a pair of spaced opposed common vertical end walls each having a broad inner face in opposed relation to the other and each having an inner vertical sidewall, a notch formed in one end of the partition wall having as one edge thereof the inner vertical side of one end wall, and a similarly formed notch in the opposite end of the partition, each of the radial walls having an inner radiused wall adapted to engage about a complementary surface of a pneumatic tool, and the vertical end walls being adapted to be detachably mounted to opposite faces of a back rib of the said tool.

Claim 15

An elastomer muffler as in claim 11, wherein a bar insert is embedded in each of the inner faces of the end walls, the insert having a plurality of openings spaced one above the other for reception of mounting bolts.

Claim 16

An elastomer muffler as in claim 11, wherein a lip coextensive with the inner radiused wall of the top wall is inclined downwardly and radially inwardly of the said radiused wall, and wherein a similar lip in opposed relation to the lip of the top wall is coextensive with the inner radiused wall of the bottom wall.