US4415062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder foot
Assignee: AT&T Inc
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Filing: 1982-09-29
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Granted: 1983-11-15
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Expires: 2002-09-29
Abstract
Abstract A ladder foot (20) comprises (a) a bracket means (25) attachable at its upper end to a ladder rail (11) and including a stud (35) extending downward from such end, (b) a shoe (60) including a central sole plate (61) and a pair of upper plates (62, 63) extending from the sole plate to straddle opposite sides of the bracket means, and (c) a pin (75) fixedly secured with the upper plates and passing from one to the other through the bracket means adjacent the front side of the stud. The downward extent of the stud includes an upper range within which the stud fits between the pin and sole plate in such manner that the shoe is locked in toe-down position. Such extent also includes a lower range for which, if the pin is moved to register therein, the shoe is angularly adjustable from its toe-down position through a range of angular positions including a flat position. Integrally joined with the stud at its upper and lower ends are portions (45, 50) serving as stops for the pin, such portions cooperating with the pin to form a partial slot having a gap in its perimeter on the side of the slot away from the stud.
Inventors
- 👤 Jonathan L. Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:41
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/46
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
373 words
A foot for a ladder having longitudinal rails, lateral rungs and transversely separated front and back sides for said rails, said foot comprising: (1) bracket means attachable at its upper end to the bottom of one such rail and having (a) a stud extending downward from said end at the back of said bracket means and having front and back sides separated by the transverse thickness of said stud, said stud (i) having an upper range over which its front and back sides are substantially longitudinal and said thickness remains substantially the same, and (ii) a lower range in which the radial distance from any point therein on such front side to any point therein on such back side at most approximates said thickness in said upper range, and said bracket means also having (b) upper stop means frontward of the front side of said stud at the top of its upper range; (2) a shoe of U-shape in lateral cross section and including: (a) a central lateral sole plate disposed outward of said bracket means, and (b) a pair of upper plates extending from said sole plate towards such bracket means to straddle laterally opposite sides thereof, and (3) a lateral pin fixedly secured at its opposite ends with said upper plates, such pin passing from one to the other of such plates through said bracket means adjacent said stud to be movable longitudinally relative thereto over such upper range, the separation between said pin and sole plate permitting the upper range of said stud to fit therebetween with a clearance facilitating such longitudinal movement; and (4) said pin pivotally coupling said shoe to said bracket means in a manner which (a) when said pin is in such lower range, permits angular adjustment of said shoe between flat and toe-down positions for which said sole plate is, respectively, transversely disposed in contact with the lower end of said bracket means and longitudinally disposed at the back side thereof, and (b) when said pin in said upper range, said shoe is locked in toe-down position, and (c) when said pin is at the top of said upper range, said upper stop means contacts said pin and is adapted to transmit longitudinal force thereto.
Claim 2
Dependent Claim
373 words
A foot for a ladder having longitudinal rails, lateral rungs and transversely separated front and back sides for said rails, said foot comprising: (1) bracket means attachable at its upper end to the bottom of one such rail and having (a) a stud extending downward from said end at the back of said bracket means and having front and back sides separated by the transverse thickness of said stud, said stud (i) having an upper range over which its front and back sides are substantially longitudinal and said thickness remains substantially the same, and (ii) a lower range in which the radial distance from any point therein on such front side to any point therein on such back side at most approximates said thickness in said upper range, and said bracket means also having (b) upper stop means frontward of the front side of said stud at the top of its upper range; (2) a shoe of U-shape in lateral cross section and including: (a) a central lateral sole plate disposed outward of said bracket means, and (b) a pair of upper plates extending from said sole plate towards such bracket means to straddle laterally opposite sides thereof, and (3) a lateral pin fixedly secured at its opposite ends with said upper plates, such pin passing from one to the other of such plates through said bracket means adjacent said stud to be movable longitudinally relative thereto over such upper range, the separation between said pin and sole plate permitting the upper range of said stud to fit therebetween with a clearance facilitating such longitudinal movement; and (4) said pin pivotally coupling said shoe to said bracket means in a manner which (a) when said pin is in such lower range, permits angular adjustment of said shoe between flat and toe-down positions for which said sole plate is, respectively, transversely disposed in contact with the lower end of said bracket means and longitudinally disposed at the back side thereof, and (b) when said pin in said upper range, said shoe is locked in toe-down position, and (c) when said pin is at the top of said upper range, said upper stop means contacts said pin and is adapted to transmit longitudinal force thereto.
Claim 3
Dependent Claim
76 words
A ladder foot according to claim 1 in which said upper stop means forms at the top of said upper range of said strut a downward facing notch for receiving said pin, said notch having a curved inner wall surface adapted to transmit primarily downward force to said pin such that the reactive upward force therefrom is substantially in line with said downward force and is without a substantial force component normal to said downward force.
Claim 4
Dependent Claim
44 words
A ladder foot according to claim 1 in which said bracket means includes lower stop means disposed frontwardly of the front side of said strut at the bottom of said lower range thereof to arrest downward movement of said pin relative to said stud.
Claim 5
Dependent Claim
53 words
A ladder foot according to claim 3 in which said lower stop means has formed therein an upwardly facing notch disposed adjacent said front side of said stud and adapted, when said pin is in said lower range, for receiving said pin and constraining it against transverse translational movement relative to said stud.
Claim 6
Dependent Claim
81 words
A ladder foot according to claim 3 in which said upper and lower stop means are integral with said stud and form frontward of the front side of said stud a partial slot with a perimeter which is bounded part way round by such front side and such upper and lower stop means, but which perimeter has a gap therein between said two stop means on the side of such partial slot transversely away from said front side of such stud.
Claim 7
Dependent Claim
31 words
A ladder foot according to claim 1 in which said stud of said bracket means extends continuously from one to the other of the laterally opposite sides of said bracket means.
Claim 8
Dependent Claim
65 words
A ladder foot according to claim 1 in which said bracket means includes a diagonal brace extending from the lower end of said stud transversely frontward and longitudinally upward to be coupled at the top thereof with said upper end of said bracket means, and in which for said bracket means has at its lower end a heel adapted to bear on said sole plate.
Claim 9
Dependent Claim
99 words
A ladder foot according to claim 7 in which said bracket means includes parallel transversely spaced back and front plates and two cross plates, said back and front plates being joined at their bottoms to the tops of, respectively, said stud and said brace and being, moreover, adapted to contain therebetween the transverse dimension of the bottom of said rail, and said two cross plates being adapted to transversely fit between said back and front plates and to be secured both thereto and to the bottom of said rail so as to attach said bracket means to such bottom.
Claim 10
Dependent Claim
24 words
A ladder foot according to claim 1 in which said shoe includes a skid resistant pad on the outer surface of said sole plate.
Claim 11
Dependent Claim
42 words
A ladder foot according to claim 1 in which said shoe includes a toothed spur coupled to said sole plate and projecting outward from the front end thereof so that such spur is presented downward when said shoe is in toe-down position.
Claim 12
Dependent Claim
304 words
A foot for a ladder having longitudinal rails, lateral rungs and transversely separated front and back sides for said rails, said foot comprising: (1) bracket means attachable at its upper end to the bottom of one such rail and having a V-shaped leg extending downward from said upper end to provide a heel at the lower end of such means, said leg having a back segment which includes as integral parts thereof: (a) a longitudinally elongated downwardly extending stud forming disposed between said upper end and said heel, and (b) upper and lower stop nibs projecting frontward from, respectively, upper and lower portions of said stud and having upper and lower, downwardly and upwardly facing, notches which are formed in, respectively, said upper and lower nibs so as to each be adjacent to the front side of said stud, said stud and said two stop nibs being definitive of a partial slot bounded over part of its perimeter by said stud's front side and said notches, and having between said two stop nibs a gap in its perimeter on the side thereof away from such front side; (2) a shoe of U-shape in lateral cross section and including: (a) a central lateral sole plate disposed outward of said bracket means, and (b) a pair of upper plates extending from said sole plate towards such bracket means to straddle laterally opposite sides thereof, and (3) a lateral pin fixedly secured at its opposite ends with said upper plates, such pin passing from one to the other of such plates through said bracket means adjacent said stud to be movable longitudinally relative thereto, the separation between said pin and sole plate permitting said stud to fit therebetween with a clearance facilitating such longitudinaly movement; and (4) said pin pivotally coupling said shoe to said bracket means.
Claim 13
Dependent Claim
304 words
A foot for a ladder having longitudinal rails, lateral rungs and transversely separated front and back sides for said rails, said foot comprising: (1) bracket means attachable at its upper end to the bottom of one such rail and having a V-shaped leg extending downward from said upper end to provide a heel at the lower end of such means, said leg having a back segment which includes as integral parts thereof: (a) a longitudinally elongated downwardly extending stud forming disposed between said upper end and said heel, and (b) upper and lower stop nibs projecting frontward from, respectively, upper and lower portions of said stud and having upper and lower, downwardly and upwardly facing, notches which are formed in, respectively, said upper and lower nibs so as to each be adjacent to the front side of said stud, said stud and said two stop nibs being definitive of a partial slot bounded over part of its perimeter by said stud's front side and said notches, and having between said two stop nibs a gap in its perimeter on the side thereof away from such front side; (2) a shoe of U-shape in lateral cross section and including: (a) a central lateral sole plate disposed outward of said bracket means, and (b) a pair of upper plates extending from said sole plate towards such bracket means to straddle laterally opposite sides thereof, and (3) a lateral pin fixedly secured at its opposite ends with said upper plates, such pin passing from one to the other of such plates through said bracket means adjacent said stud to be movable longitudinally relative thereto, the separation between said pin and sole plate permitting said stud to fit therebetween with a clearance facilitating such longitudinaly movement; and (4) said pin pivotally coupling said shoe to said bracket means.
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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |