US3918530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eccentric element for silencing tool and method
Assignee: Atlas Copco AB
•
Filing: 1973-11-15
•
Granted: 1975-11-11
•
Expires: 1993-11-15
Abstract
Abstract A method and a means for silencing the noise generated by a vibrating impact transmitting tool such as a pneumatic hammer operated chisel, pick, spade or ballast tamper in which an elastomeric damping element in saddle-like manner is clamped fast eccentrically to a shaft portion of the tool by an encasing metallic sleeve. The sleeve is slipped over and past a retaining collar on the tool and bent along lines longitudinal thereto in order to provide a firm radial grip around the damping element and shaft portion.
Inventors
- 👤 Bengt Viktor Nyholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:16
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/11; Y; Y10; Y10S; Y10S173/00; Y10S173/02; Y10T; Y10T279/00; Y10T279/17; Y10T279/17042; Y10T279/17094
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
164 words
A method for silencing a percussion tool by affixing a vibration damping element in contiguous relation thereto, said tool incorporating a shaft portion and a retaining collar adjacent thereto, the method comprising: passing an undivided substantially cylindrical metallic sleeve over said shaft portion past said collar; encasing a vibration damping element between said sleeve and said shaft portion in eccentric mass relation to said shaft portion over substantially the whole length of said sleeve and over substantially the whole length of said damping element in the axial direction of said shaft portion; and thereupon bending said sleeve locally at at least one portion thereof peripherally spaced from the portion of said sleeve opposite to an eccentric mass portion of said vibration damping element and along at least one line extending longitudinally thereof for shrinking said sleeve radially to fixedly circumferentially clamp said vibration damping element to said shaft portion with said vibration damping element disposed in said eccentric mass relation to said shaft portion.
Claim 2
Independent Claim
164 words
A method for silencing a percussion tool by affixing a vibration damping element in contiguous relation thereto, said tool incorporating a shaft portion and a retaining collar adjacent thereto, the method comprising: passing an undivided substantially cylindrical metallic sleeve over said shaft portion past said collar; encasing a vibration damping element between said sleeve and said shaft portion in eccentric mass relation to said shaft portion over substantially the whole length of said sleeve and over substantially the whole length of said damping element in the axial direction of said shaft portion; and thereupon bending said sleeve locally at at least one portion thereof peripherally spaced from the portion of said sleeve opposite to an eccentric mass portion of said vibration damping element and along at least one line extending longitudinally thereof for shrinking said sleeve radially to fixedly circumferentially clamp said vibration damping element to said shaft portion with said vibration damping element disposed in said eccentric mass relation to said shaft portion.
Claim 3
Dependent Claim
32 words
A method according to claim 1 further comprising clamping a retaining liner between said sleeve and said shaft portion in opposite position to said eccentric mass portion of said vibration damping element.
Claim 4
Dependent Claim
24 words
A method according to claim 1 further comprising locally bending said sleeve adjacent an interface between said vibration damping element and said shaft portion.
Claim 5
Dependent Claim
35 words
A method according to claim 1 further comprising locally bending said sleeve by forming at least one longitudinal ridge along its full length and depressed into said eccentric mass portion of said vibration damping element.
Claim 6
Dependent Claim
47 words
A method according to claim 1 wherein said vibration damping element straddles in a saddle-like manner substantially only one circumferential side of said shaft portion and comprising locating a retaining liner between said shaft portion and the portion of said sleeve opposite to said vibration damping element.
Claim 7
Dependent Claim
147 words
A silenced percussion tool comprising: a shank; a retaining collar adjacent said shank; a working section; a shaft portion disposed between said collar and said working section for transmitting impacts therebetween, whereby the tool is caused to vibrate and to produce noise; a vibration dampener on said shaft portion and axially spaced from said collar, said vibration dampener including a vibration damping element comprising a large mass portion extending substantially over the whole length thereof which large mass portion straddles in saddle-like manner only a portion of the circumference of said shaft portion for silencing said noise; and means extending axially of said shaft portion and being substantially coextensive with said vibration damping element in the axial direction of said shaft portion for affixing said vibration damping element to said tool in simultaneous unilateral surface contact and with said large mass portion in eccentric mass relation thereto.
Claim 8
Dependent Claim
147 words
A silenced percussion tool comprising: a shank; a retaining collar adjacent said shank; a working section; a shaft portion disposed between said collar and said working section for transmitting impacts therebetween, whereby the tool is caused to vibrate and to produce noise; a vibration dampener on said shaft portion and axially spaced from said collar, said vibration dampener including a vibration damping element comprising a large mass portion extending substantially over the whole length thereof which large mass portion straddles in saddle-like manner only a portion of the circumference of said shaft portion for silencing said noise; and means extending axially of said shaft portion and being substantially coextensive with said vibration damping element in the axial direction of said shaft portion for affixing said vibration damping element to said tool in simultaneous unilateral surface contact and with said large mass portion in eccentric mass relation thereto.
Claim 9
Dependent Claim
28 words
A silenced tool according to claim 6 in which said vibration damping element is an elastomeric cushion with a thickness exceeding half the thickness of said shaft portion.
Claim 10
Dependent Claim
56 words
A silenced tool according to claim 6 in which said affixing means includes at least one sleeve encasing said vibration damping element and circumferentially clamping said vibration element to said shaft portion; and in which a retaining liner is disposed between said shaft portion and the portion of said sleeve opposite to said vibration damping element.
Claim 11
Dependent Claim
45 words
A silenced tool according to claim 8 in which said sleeve has at least one longitudinal inwardly directed ridge along its full length and depressed into said large mass portion of said vibration damping element for clamping said sleeve therearound and around said shaft portion.
Claim 12
Dependent Claim
50 words
A silenced tool according to claim 8 in which said sleeve has at least one outwardly directed ridge thereon adjacent the interface between said vibration damping element and said shaft portion, said at least one ridge being depressable for clamping said sleeve around said vibration damping element and shaft portion.
Claim 13
Dependent Claim
45 words
A silenced tool according to claim 8 wherein said friction liner and said vibration dampening element are dimensioned so as to form a space therebetween, said void space also being bounded by said sleeve and a portion of the outer periphery of said shaft portion.
Claim 14
Dependent Claim
22 words
A silenced tool according to claim 6 wherein said vibration damping element straddles substantially only one circumferential side of said shaft portion.
Claim 15
Dependent Claim
172 words
A silenced percussion tool comprising: a shank; a retaining collar adjacent said shank; a working section; a shaft portion disposed between said collar and said working section for transmitting impacts from said shank to said working section whereby the tool is caused to vibrate and to produce noise; a vibration dampener on said shaft portion and axially spaced from said collar, said vibration dampener including a vibration damping element comprising a large mass portion which in saddle-like manner eccentrically straddles a portion of the circumference of said shaft portion for silencing said noise; at least one undivided metallic sleeve having an internal perimeter larger than the perimeter of said collar and for circumferentially clamping said vibration damping element to said shaft portion for affixing said vibration damping element to said tool in unilateral surface contact therewith, and with said vibration damping element confined to substantially one side Of said shaft portion; and a friction liner clamped between said shaft portion and the portion of said sleeve opposite to said vibration damping element.
Claim 16
Dependent Claim
172 words
A silenced percussion tool comprising: a shank; a retaining collar adjacent said shank; a working section; a shaft portion disposed between said collar and said working section for transmitting impacts from said shank to said working section whereby the tool is caused to vibrate and to produce noise; a vibration dampener on said shaft portion and axially spaced from said collar, said vibration dampener including a vibration damping element comprising a large mass portion which in saddle-like manner eccentrically straddles a portion of the circumference of said shaft portion for silencing said noise; at least one undivided metallic sleeve having an internal perimeter larger than the perimeter of said collar and for circumferentially clamping said vibration damping element to said shaft portion for affixing said vibration damping element to said tool in unilateral surface contact therewith, and with said vibration damping element confined to substantially one side Of said shaft portion; and a friction liner clamped between said shaft portion and the portion of said sleeve opposite to said vibration damping element.
Claim 17
Dependent Claim
45 words
A silenced tool according to claim 13 in which said sleeve has at least one longitudinal inwardly directed ridge along its full length and depressed into said large mass portion of said vibration damping element for clamping said sleeve therearound and around said shaft portion.
Claim 18
Dependent Claim
44 words
A silenced tool according to claim 13 wherein said friction liner and said vibration dampening element are dimensioned so as to form a space therebetween, said void space also being bounded by said sleeve and portion of the outer periphery of said shaft portion.
Claim 19
Independent Claim
176 words
A method for silencing a percussion tool by affixing a vibration damping element in contiguous relation thereto, said tool incorporating a shaft portion and retaining collar adjacent thereto, the method comprising: passing an undivided substantially cylindrical metallic sleeve over said shaft portion past said collar; encasing a vibration damping element between said sleeve and said shaft portion in eccentric mass relation to said shaft portion with said vibration damping element straddling in a saddle-like manner substantially only one circumferential side of said shaft portion; locating a retaining liner between said shaft portion and the portion of said sleeve opposite to said vibration damping element; and thereupon bending said sleeve locally at at least one portion thereof peripherally spaced from the portion of said sleeve opposite to an eccentric mass portion of said vibration damping element and along at least one line extending longitudinally thereof for shrinking said sleeve radially to fixedly circumferentially clamp said vibration damping element to said shaft portion with said vibration damping element disposed in said eccentric mass relation to said shaft portion.
Claim 20
Independent Claim
176 words
A method for silencing a percussion tool by affixing a vibration damping element in contiguous relation thereto, said tool incorporating a shaft portion and retaining collar adjacent thereto, the method comprising: passing an undivided substantially cylindrical metallic sleeve over said shaft portion past said collar; encasing a vibration damping element between said sleeve and said shaft portion in eccentric mass relation to said shaft portion with said vibration damping element straddling in a saddle-like manner substantially only one circumferential side of said shaft portion; locating a retaining liner between said shaft portion and the portion of said sleeve opposite to said vibration damping element; and thereupon bending said sleeve locally at at least one portion thereof peripherally spaced from the portion of said sleeve opposite to an eccentric mass portion of said vibration damping element and along at least one line extending longitudinally thereof for shrinking said sleeve radially to fixedly circumferentially clamp said vibration damping element to said shaft portion with said vibration damping element disposed in said eccentric mass relation to said shaft portion.
Claim 21
Dependent Claim
113 words
A silenced percussion tool comprising: a shank; a retaining collar adjacent said shank; a working section; a shaft portion disposed between said collar and said working section for transmitting impacts therebetween, whereby the tool is caused to vibrate and to produce noise; a vibration dampener on said shaft portion and axially spaced from said collar, said vibration dampener including a vibration damping element comprising a large mass portion which in saddle-like manner straddles substantially only one circumferential side of said shaft portion for silencing said noise; and means for affixing said vibration damping element to said tool in simultaneous unilateral surface contact and with said large mass portion in eccentric mass relation thereto.
Claim 22
Dependent Claim
113 words
A silenced percussion tool comprising: a shank; a retaining collar adjacent said shank; a working section; a shaft portion disposed between said collar and said working section for transmitting impacts therebetween, whereby the tool is caused to vibrate and to produce noise; a vibration dampener on said shaft portion and axially spaced from said collar, said vibration dampener including a vibration damping element comprising a large mass portion which in saddle-like manner straddles substantially only one circumferential side of said shaft portion for silencing said noise; and means for affixing said vibration damping element to said tool in simultaneous unilateral surface contact and with said large mass portion in eccentric mass relation thereto.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |