US5459952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for digging and transplating trees
Assignee: Dutchmaster Nurseries Ltd
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Filing: 1994-04-11
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Granted: 1995-10-24
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Expires: 2014-04-11
Abstract
Abstract Apparatus for digging and transplanting trees and the like comprises a horizontal frame to which a plurality of sliding spade assemblies is mounted, each comprising a spade blade, a thrust tube secured to the blade and a slide housing, also secured to the blade, which surrounds a portion of the outer surface of the thrust tube. The tower is received within a channel between the thrust tube and the slide housing, so that the spade assembly may be reciprocally moved along the tower with the blade supported both inside and outside the tower for improved stress distribution and durability. The bearing surfaces of the tower and the slider are provided with linings of plastic to minimize frictional resistance.
Inventors
- 👤 Marlin Tillaart
- 👤 Martien van Denoever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:58
CPC Classifications
A; A01; A01G; A01G23/00; A01G23/02; A01G23/04; A01G23/046
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
223 words
An apparatus for digging and transplanting trees comprising: (a) a multi-sided frame for encircling a tree to be transplanted when disposed horizontally to the ground; (b) a plurality of towers mounted on said frame and extending angularly upwardly therefrom, each said tower being in the form of a first channel open along one side; (c) a removable sliding spade assembly for each of said towers, including a spade blade having a lower digger portion and an integral upper stem portion of generally the same length, a hollow thrust tube welded along one side thereof centrally to said stem portion and being of a cross-sectional shape for accommodation within said open channel of the tower, and a slide housing in the form of a second channel, larger than said first channel, embracing a section of said thrust tube in spaced relation thereto and welded to said stem portion of the blade so that a sliding spade assembly channel is formed between said thrust tube and said slide housing for telescopically receiving the wall of said first channel of said tower between the outer surface of said thrust tube and the inner surface of said second channel for reciprocating movement of the sliding spade assembly relative to the tower; and (d) power means for actuating said sliding spade assembly for reciprocating movement along said tower.
Claim 2
Independent Claim
223 words
An apparatus for digging and transplanting trees comprising: (a) a multi-sided frame for encircling a tree to be transplanted when disposed horizontally to the ground; (b) a plurality of towers mounted on said frame and extending angularly upwardly therefrom, each said tower being in the form of a first channel open along one side; (c) a removable sliding spade assembly for each of said towers, including a spade blade having a lower digger portion and an integral upper stem portion of generally the same length, a hollow thrust tube welded along one side thereof centrally to said stem portion and being of a cross-sectional shape for accommodation within said open channel of the tower, and a slide housing in the form of a second channel, larger than said first channel, embracing a section of said thrust tube in spaced relation thereto and welded to said stem portion of the blade so that a sliding spade assembly channel is formed between said thrust tube and said slide housing for telescopically receiving the wall of said first channel of said tower between the outer surface of said thrust tube and the inner surface of said second channel for reciprocating movement of the sliding spade assembly relative to the tower; and (d) power means for actuating said sliding spade assembly for reciprocating movement along said tower.
Claim 3
Dependent Claim
40 words
An apparatus for digging and transplanting trees according to claim 1, wherein said first channel and said second channel are rectangular in cross-sectional shape and said hollow thrust tube is of a generally square configuration on said other sides thereof.
Claim 4
Dependent Claim
43 words
An apparatus for digging and transplanting trees according to claim 2, wherein high molecular-weight, low-friction plastic linings are affixed to the surface of said tower within said first rectangular channel and to the surfaces of said slide housing within said second rectangular channel.
Claim 5
Dependent Claim
48 words
An apparatus for digging and transplanting trees according to claim 3, wherein said power means comprises hydraulic actuating means located in the hollow interior of said thrust tube and operatively connected to the top of the thrust tube and to said tower at a position below said frame.
Claim 6
Dependent Claim
50 words
An apparatus for digging and transplanting trees according to claim 3, wherein said spade blades are convexly curved and formed with a medial fold line along the length thereof, so that the lower digger portion of each said spade blade presents a convex outer surface and a concave inner surface.
Claim 7
Dependent Claim
28 words
An apparatus for digging and transplanting trees according to claim 5, wherein the degree of curvature of each said spade blade decreases outwardly from said medial fold line.
Claim 8
Dependent Claim
33 words
An apparatus for digging and transplanting trees according to claim 6, further comprising a cover plate affixed across the bottom opening of said tower to prevent entry of debris during a digging operation.
Claim 9
Dependent Claim
53 words
An apparatus for digging and transplanting trees according to claim 7, further comprising a V-shaped scraper plate affixed to the back of said tower at the bottom thereof in close proximity to the concave inner surface of said digger portion of the blade when said sliding spade assembly is installed on the tower.
References Cited (Backward Citations)
US3032368A
Cited
US3017707A
Cited
US3017719A
Cited
US3191982A
Cited
US3558177A
Cited
US3713995A
Cited
US3775876A
Cited
US4031637A
Cited
US4211020A
Cited
US4226033A
Cited
US4286398A
Cited
US4351253A
Cited
US4402148A
Cited
US4341025A
Cited
US4403427A
Cited
US4604017A
Cited
US4625662A
Cited
US4979321A
Cited
US5081941A
Cited
US5129336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-23 | 1999-04-24 | 1999-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-23 | 2003-04-24 | 2003-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-23 | 2007-04-24 | 2007-10-24 | $7700.00 | Window Closed / Lapsed |