Patent US4435073A successfully refreshed from Google Patents.
Patent US4005944A successfully refreshed from Google Patents.
US4005944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamping apparatus
Assignee: Individual
•
Filing: 1975-08-06
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Granted: 1977-02-01
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Expires: 1995-08-06
Abstract
Abstract An articulated tractor-type vehicle having a supporting frame including a pivotable boom to which a steerable wheel is mounted. The supporting frame carries an adjustably positionable tamping unit and an adjustably positionable trench filling unit such as a drag conveyor to provide simultaneous filling and tamping of a trench. A novel reciprocating tamping unit having increased effectiveness and reduced shock transmission is described.
Inventors
- 👤 Marvin K. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:36
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/78; E02D; E02D3/00; E02D3/02; E02D3/046; E02D3/068; E02F3/96; E02F3/961; E02F5/00; E02F5/22; E02F5/223; E02F5/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A device for tamping a trench comprising: a supporting means; a housing attached to said supporting means; means for providing lost motion along a substantially vertical axis between the supporting means and the housing; an elongated tamping shoe having an upturned portion on the forward end thereof, said tamping shoe being hingedly connected to said housing near the forward end thereof rearwardly of said upturned portion; a drive shaft adapted for reciprocal movement within said housing, said drive shaft extending below said housing and being pivotally connected to a rearward portion of said tamping shoe; and reciprocating drive means resiliently connected to said drive shaft for imparting reciprocal movement thereto.
Claim 2
Independent Claim
110 words
A device for tamping a trench comprising: a supporting means; a housing attached to said supporting means; means for providing lost motion along a substantially vertical axis between the supporting means and the housing; an elongated tamping shoe having an upturned portion on the forward end thereof, said tamping shoe being hingedly connected to said housing near the forward end thereof rearwardly of said upturned portion; a drive shaft adapted for reciprocal movement within said housing, said drive shaft extending below said housing and being pivotally connected to a rearward portion of said tamping shoe; and reciprocating drive means resiliently connected to said drive shaft for imparting reciprocal movement thereto.
Claim 3
Dependent Claim
51 words
A tamping device according to claim 1 wherein the drive shaft has a bushing at its upper end with an axial opening therethrough, the reciprocating drive means extends through the opening, and separate spring means are provided on the drive means for contacting the upper and lower surfaces of said bushing.
Claim 4
Dependent Claim
26 words
A tamping device according to claim 1 including means for rotating the tamping shoe about an arc in a horizontal plane relative to the supporting means.
Claim 5
Dependent Claim
31 words
A tamping device according to claim 1 wherein the supporting means is attached to a vehicle and means are provided for adjusting the supporting means vertically and horizontally with respect thereto.
Claim 6
Dependent Claim
60 words
A tamping device as defined in claim 4 including a second lost motion means connected to said supporting means for allowing lost motion in the horizontal adjusting thereof, and a spring being disposed on each side of said lost motion means for biasing said supporting means to an intermediate position but allowing a slight horizontal movement from said intermediate position.
Claim 7
Dependent Claim
20 words
A tamping device according to claim 4 including means for tilting the tamping device from side-to-side relative to said vehicle.
Claim 8
Dependent Claim
28 words
A tamping device according to claim 1 wherein said lost motion means comprises a post rigidly attached to said housing and a sleeve slideably received on said post.
Claim 9
Dependent Claim
23 words
A tamping device according to claim 7 wherein a spring is disposed around the post on each end above and below said sleeve.
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) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |