Muffled tool for vibratory or impact machines

Claim 2

A tool for use in vibratory or impact machines, comprising a tool body and a collar of vibration dampening material mounted on said tool body to extend around said tool body at the point of maximum lateral amplitude of vibration of the tool body during operation of the machine, said collar of vibration dampening material being of length to extend around said tool body only at the said point of maximum lateral amplitude of vibration of said tool body and for a thereadjacent minor portion of the length of said tool body.

Claim 3

A tool according to claim 1, wherein retaining means extend around said collar for retaining said collar in fixed position around said tool body.

Claim 4

A tool according to claim 1, wherein said tool body is provided with a circumferential recess receiving said collar.

Claim 5

A tool according to claim 1, wherein said tool body is provided with a circumferential recess receiving said collar and retaining means encircle said collar for retaining said collar in fixed position around said tool body.

Claim 6

A tool according to claim 1, wherein said collar is of rubber-like material.

Claim 7

A tool for use in vibratory or impact machines, comprising a tool body having a rearward end for connection to the machine and a forward working end, said tool body further having a circumferential collar spaced longitudinally of the tool body from said forward working end, and a collar of vibration dampening material retained on said tool body intermediate said circumferential collar and said forward working end to encircle the point of maximum lateral amplitude of vibration of the tool body during operation of the machine, said collar of vibration dampening material being of length to encircle only said point of maximum lateral amplitude of vibration of said tool body and a thereadjacent minor portion of the length of said tool body.

Claim 8

A tool for use in vibratory or impact machines, comprising a tool body having a rearward end for connection to the machine and a forward working end, said tool body further having a circumferential collar spaced longitudinally of the tool body from said forward working end, and a collar of vibration dampening material retained on said tool body intermediate said circumferential collar and said forward working end to encircle the point of maximum lateral amplitude of vibration of the tool body during operation of the machine, said collar of vibration dampening material being of length to encircle only said point of maximum lateral amplitude of vibration of said tool body and a thereadjacent minor portion of the length of said tool body.

Claim 9

A tool according to claim 6, wherein said collar of vibration dampening material is of rubber-like material.

Claim 10

A tool according to claim 6, wherein said tool body has a reduced diameter portion providing a recess encircling such point of maximum lateral amplitude of vibration and said collar of vibration dampening material is in such recess.

Claim 11

A tool according to claim 8, wherein retaining means encircle said collar of vibration dampening material for retaining the collar in fixed position on said tool body.

Claim 12

A tool according to claim 9, wherein said retaining means comprise a sleeve having an end adjacent said circumferential collar.

Claim 13

A tool for use in vibratory or impact machines, comprising a tool body, a casing surrounding said tool body for at least a portion of its length and connected to said tool body at two locations which are spaced longitudinally of said tool body and on opposite sides of the point of maximum lateral amplitude of vibration of the tool body during operation of the machine, said casing containing a space located to surround said tool body at said point of maximum lateral amplitude of vibration of the tool body, and vibration absorbing material in said space, said vibration absorbing material surrounding said tool body only at said point of maximum lateral amplitude of vibration and for a thereadjacent minor portion of the length of the tool body.

Claim 14

A tool for use in vibratory or impact machines, comprising a tool body, a casing surrounding said tool body for at least a portion of its length and connected to said tool body at two locations which are spaced longitudinally of said tool body and on opposite sides of the point of maximum lateral amplitude of vibration of the tool body during operation of the machine, said casing containing a space located to surround said tool body at said point of maximum lateral amplitude of vibration of the tool body, and vibration absorbing material in said space, said vibration absorbing material surrounding said tool body only at said point of maximum lateral amplitude of vibration and for a thereadjacent minor portion of the length of the tool body.

Claim 15

A tool according to claim 11, wherein said vibration absorbing material is a granular solid material.

Claim 16

A tool according to claim 12, wherein the granular solid material is sand.

Claim 17

A tool according to claim 13, wherein said vibration absorbing material is a polymeric solid material.

Claim 18

A tool according to claim 13, wherein said vibration absorbing material is an injection molded polymeric material.

Claim 19

A tool according to claim 14, wherein the polymeric material is a strip wrapped around said tool body and entrapped between it and said casing.

Claim 20

A tool according to claim 11, wherein said tool body is constructed of hard steel and said casing is constructed of mild steel.

Claim 21

A tool according to claim 11, wherein said casing is provided with at least two portions of different thicknesses and said tool body has a corresponding number of portions with respectively corresponding cross-sectional dimensions to mate with said portions of said casing, said space being axially between said mating portions.

Claim 22

A tool according to claim 18, wherein said casing and said tool body include three said mating portions and the middle one of such mating portions is axially narrow compared to the others thereof.