Patent US4461491A successfully refreshed from Google Patents.
US4461491A
Expired / Lapsed
US
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Trailer sand shoes
Assignee: Fleet Engineers Inc
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Filing: 1982-07-12
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Granted: 1984-07-24
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Expires: 2002-07-12
Abstract
Abstract A trailer sand shoe (10) mounted to the legs of a trailer vehicle includes a rectangular metal base plate (12) and upstanding sides (14) and (16) fixed to the base plate (12). The central portions of the side plates (14) and (16) have openings (32) in the top portion thereof for mounting the sand shoe (10) to the legs of the trailer vehicle. The base plate (12) includes an integral reinforcing portion (34) which extends perpendicularly between the side plates (14) and (16) and is formed from the base plate (12). The reinforcing portion (34) has a generally inverted V-shaped cross-sectional configuration. The central reinforcing portion (34) adds rigidity to the sand shoe (10) as well as reduces manufacturing costs by eliminating the need for a separate reinforcing member.
Inventors
- 👤 Louis E. Eklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:38
CPC Classifications
B; B60; B60S; B60S9/00; B60S9/02; Y; Y10; Y10S; Y10S254/00; Y10S254/01
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
In a trailer sand shoe for use on the bottom of support legs on a trailer vehicle, the sand shoe comprising: a rectangular metal base plate having a central portion; metal side support plates rigidly fixed to said base plate and extending upwardly therefrom, each of said side support plates having a central web and side webs bent laterally of said central web, the central web being generally perpendicular to the base plate and having an opening therein at the top thereof for mounting the sand shoe to support legs of a trailer vehicle; the improvement which comprises: said base plate including an integral reinforcing portion formed from said base plate and comprising an upward deformation of said central portion extending perpendicularly between and above the bottom of said central webs of said side support plates and joined thereto, said deformation having side edges formed by slits in the base, the side edges of the deformation abutting the central webs of the side support plates and extending to a height sufficient to rigidify the side support plates against lateral movement.
Claim 2
Dependent Claim
180 words
In a trailer sand shoe for use on the bottom of support legs on a trailer vehicle, the sand shoe comprising: a rectangular metal base plate having a central portion; metal side support plates rigidly fixed to said base plate and extending upwardly therefrom, each of said side support plates having a central web and side webs bent laterally of said central web, the central web being generally perpendicular to the base plate and having an opening therein at the top thereof for mounting the sand shoe to support legs of a trailer vehicle; the improvement which comprises: said base plate including an integral reinforcing portion formed from said base plate and comprising an upward deformation of said central portion extending perpendicularly between and above the bottom of said central webs of said side support plates and joined thereto, said deformation having side edges formed by slits in the base, the side edges of the deformation abutting the central webs of the side support plates and extending to a height sufficient to rigidify the side support plates against lateral movement.
Claim 3
Dependent Claim
19 words
The trailer sand shoe of claim 1 wherein said integral reinforcing portion has a uniform inverted V-shaped cross-sectional configuration.
Claim 4
Dependent Claim
29 words
The trailer sand shoe of claim 2 wherein said base plate further includes strengthening embossments extending perpendicular to said side support plates and spaced apart from said reinforcing portion.
Claim 5
Dependent Claim
21 words
The trailer sand shoe of claim 2 wherein said integral reinforcing portion is joined to said central webs by welds therebetween.
Claim 6
Dependent Claim
30 words
The trailer sand shoe of claim 4 wherein said central webs are further joined to said base plate through welds which extend along a bottom edge of said central webs.
Claim 7
Dependent Claim
52 words
The trailer sand shoe of claims 1, 2, 4 or 5 wherein said integral reinforcing portion is formed by first making two parallel slits in a flat rectangular blank and thereafter deforming the portion between said slits upwardly with respect to a top surface of said blank and uniformly between said slits.
Claim 8
Dependent Claim
22 words
The trailer sand shoe of claim 6 wherein said integral reinforcing portion is uniform in cross-sectional shape between said side support plates.
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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |