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US 5,841,080 AGranted
Blower pipe with silencer
AssigneeKioritz Corporation
InventorsGiichi Iida, Kouji Arahata, Tetsuya Yoshioka
Life of this patent
Estimating the term…
Abstract
A working machine such as a power blower has a blower pipe with a silencer. The blower pipe has an outer pipe and a perforated inner pipe, with a sound absorbing material disposed between the inner and outer pipes. For ease of handling in use of the power blower, the outer pipe has substantially constant diameter. For ease of storage, the pipe is detachable.
Claims8
A blower pipe, including a silencer, for use with a power blower having an air outlet spout, said blower pipe comprising:
- an outer pipe having an upstream portion adapted to be secured to the air outlet spout;
- an inner pipe disposed substantially coaxially within said outer pipe, said inner pipe having an upstream end portion which widens outwardly towards said upstream portion of said outer pipe to lower flow resistance to air from the air outlet spout, said inner pipe having a main portion located downstream of said upstream end portion, said main portion having a substantially constant diameter and a plurality of lateral holes formed therein, said main portion terminating in a free downstream end portion, said outer pipe, said inner pipe upstream end portion and said inner pipe main portion defining a sound-absorption-material-receiving space therebetween;
- and
- a sound absorption material disposed in said space, said material having an open downstream end for reduced flow resistance to the air, said open downstream end being substantially contiguous with said free downstream end portion of said main portion of said inner pipe for inhibiting transmission of vibration of said inner pipe to said outer pipe.
1 more element
A blower pipe including a silencer for interconnection with a mating section having pins, said blower pipe comprising:
- an outer pipe;
- an inner pipe disposed substantially coaxially within the outer pipe and having a plurality of lateral holes;
- and
- a sound absorption material disposed in a space between the inner pipe and the outer pipe;
- wherein;
- the outer pipe has pipe has pipe inlet and outlet side connecting portions;
- and
- at least one of the pipe inlet and outlet side connecting portions comprises a pair of L-shaped connecting grooves for holding the pins.
5 more elements
Dependencies are inferred from the claim text.