# US 5,704,259 A · Hand operated impact implement having tuned vibration absorber > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,704,259 A - Document ID: US5704259A - Status: Granted - Kind: A - Application number: 08/551,991 - Filed: 1995-11-02 - Granted: 1998-01-06 - Earliest claimed: 1995-11-02 - Assignees: Roush Anatrol, Inc. - Inventors: Paul J. Riehle - Web page: https://patentgrep.com/patent/US5704259A ## CPC - B25G 1/01: Shock-absorbing means (B25G1/02 takes precedence) - B25G: HANDLES FOR HAND IMPLEMENTS (attaching the blades or the like to handles of hand tools for soil working A01B1/22; handles of hand implements for harvesting A01D1/14; handles integral with brushware A46B) ## Abstract A hand operated impact implement having a tuned vibration absorber includes a head for impacting an object, a handle connected to the head, and a tuned vibration damper attached to the handle and/or head to damp overall handle/head vibration of the impact implement after impacting an object. ## Claims ### Claim 1 A hand operated impact implement having vibration damping comprising: a head for impacting an object; a handle connected to said head; a tuned vibration absorber attached to said handle to reduce overall handle/head vibration of said impact implement after impacting an object; and wherein said tuned vibration absorber is externally positioned on said handle near a middle portion of said handle. ### Claim 2 A hand operated impact implement having vibration damping comprising: a head for impacting an object; a handle connected to said head; a tuned vibration absorber having a mass and a viscoelastic damping element, whereby said mass and said damping element form at least one degree-of-freedom dynamic system tuned to vibrate near overall resonances of said impact implement and positioned internally within said handle of said impact implement. ### Claim 3 (depends on 2) A hand operated impact implement having vibration damping as set forth in claim 2 wherein said damping element is disposed between said mass and said handle. ### Claim 4 (depends on 2) A hand operated impact implement having vibration damping as set forth in claim 2 wherein said handle has a hollow interior chamber and said tuned vibration absorber is disposed within said hollow interior chamber. ### Claim 5 (depends on 2) A hand operated impact implement having vibration damping as set forth in claim 2 wherein said handle has a hollow recess in a gripping end of said handle and said tuned vibration absorber is positioned within said hollow recess. ### Claim 6 (depends on 2) A hand operated impact implement having vibration damping as set forth in claim 2 including a cap attached to a free end of the handle such that the cap extends beyond the free end of the handle. ### Claim 7 A hand operated impact implement having vibration damping comprising: a head for impacting an object; a handle connected to said head; a tuned vibration absorber having a mass and a damping element, whereby said mass and said damping element form at least one degree-of-freedom dynamic system tuned to vibrate near overall resonances of said impact implement and positioned either one of internally or externally along said handle of said impact implement; and wherein said damping element comprises at least one o-ring. ### Claim 8 A hand operated impact implement having vibration damping comprising: a head for impacting an object; a handle connected to said head; a tuned vibration absorber having a mass and a damping element, whereby said mass and said damping element form at least one degree-of-freedom dynamic system tuned to vibrate near overall resonances of said impact implement and positioned either one of internally or externally along said handle of said impact implement; a cap attached to a free end of said handle such that said cap extends beyond the free end of said handle; and wherein said tuned vibration absorber is disposed within said cap. ### Claim 9 A hand operated impact implement having vibration damping comprising: a head for impacting an obiect; a handle connected to said head; a tuned vibration absorber having a mass and a damping element, whereby said mass and said damping element form at least one degree-of-freedom dynamic system tuned to vibrate near overall resonances of said impact implement and positioned either one of internally or externally along said handle of said impact implement; and wherein said damping element comprises a grip cover disposed around said handle and said mass is molded inside said grip cover so that said mass extends beyond a free end of said handle. ### Claim 10 A hand operated impact implement having vibration damping comprising: a head for impacting an object; a handle connected to said head; a tuned vibration absorber having a mass and a damping element, whereby said mass and said damping element form at least one degree-of-freedom dynamic system tuned to vibrate near overall resonances of said impact implement and positioned either one of internally or externally along said handle of said impact implement; a grip cover disposed about said tuned vibration absorber and a gripping end of said handle; and said grip cover including a recess between said mass and an interior wall of said grip cover for controlling stiffness of said tuned vibration damper. ### Claim 11 A hand operated impact implement having vibration damping comprising: a head for impacting an object; a handle connected to said head; a tuned vibration absorber having a mass and a viscoelastic damping element, whereby said mass and said damping element form at least one degree-of-freedom dynamic system tuned to vibrate near overall resonances of said impact implement and positioned either one of internally or externally along said handle of said impact implement; and a grip cover disposed about said tuned vibration absorber and a gripping end of said handle. ### Claim 12 A hand operated impact implement having vibration damping comprising: a head for impacting an object; a handle connected to said head; and a tuned vibration absorber having a mass and a viscoelastic damping element, said mass having a density greater than a density of said damping element, said tuned vibration absorber being positioned within said handle to damp overall handle/head vibration of said impact implement after impacting an object. ### Claim 13 A hand operated impact implement having vibration damping comprising: a head for impacting an object; a handle connected to said head; and a tuned vibration absorber externally positioned on said handle and spaced from said head and a free end of said handle to reduce overall handle/head vibration of said impact implement after impacting an object. ### Claim 14 A hand operated impact implement having vibration damping comprising: a head for impacting an object and having a hollow recess; a handle connected to said head; and a tuned vibration absorber positioned within said hollow recess and having a mass and a damping element, wherein said damping element is disposed between said mass and said head to reduce overall handle/head vibration of said impact implement after impacting an object. ### Claim 15 A hand operated impact implement having vibration damping comprising: a head for impacting an object; a handle connected to said head; a tuned vibration absorber having a mass and a damping element externally positioned on a free end of said of handle and a cap attached to the free end of said handle and enclosing said mass and said damping element such that said cap extends beyond the free end of said handle, whereby said mass and said damping element form at least one degree-of-freedom dynamic system tuned to vibrate near overall resonances of said impact implement after impacting an object.