Patent US3874263A successfully refreshed from Google Patents.
US3874263A
Expired / Lapsed
US
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Metal penetrating staple
Assignee: Illinois Tool Works Inc
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Filing: 1974-01-09
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Granted: 1975-04-01
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Expires: 1994-01-09
Abstract
Abstract A metal penetrating staple formed from a resilient sheet stock material and which has entering points, each including a pair of camming surfaces of dissimilar lengths. One longitudinal edge of each leg of the staple includes locking means which cooperate with the longest camming surface to produce a spring-like lock beneath a metal plate after the staple has penetrated the plate.
Inventors
- 👤 Gerald D Barth
- 👤 Ralph E Jennings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:43
CPC Classifications
F; F16; F16B; F16B15/00; F16B15/06; Y; Y10; Y10S; Y10S411/00; Y10S411/92; Y10S411/921
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
A metal-penetrating staple formed from sheet stock material including a crown portion and pair of legs extending thereform, the legs each including an entering point formed from a pair of unequal camming surfaces intersecting at an apex, one edge of each leg including means for locking the staple in an associated workpiece, the longest camming surface of the entering point being located on the same edge of the leg on which the locking means is located, the staple being formed of a resilient material which enables the locking means to spring into locking position when the staple is driven through a metal workpiece, the axial dimensions of the crown section and legs lying in a common arcuate cross-sectional path when viewed in planes generally perpendicular to the longitudinal axis of the staple, said crown and leg portions being generally the same thickness, clamping ears formed intEgral with the crown and extending outwardly therefrom, said ears lying in a common longitudinal plane which intersects the arcuate path to distribute the clamping load in a plane different than the place of the penetration of the legs.
Claim 2
Dependent Claim
184 words
A metal-penetrating staple formed from sheet stock material including a crown portion and pair of legs extending thereform, the legs each including an entering point formed from a pair of unequal camming surfaces intersecting at an apex, one edge of each leg including means for locking the staple in an associated workpiece, the longest camming surface of the entering point being located on the same edge of the leg on which the locking means is located, the staple being formed of a resilient material which enables the locking means to spring into locking position when the staple is driven through a metal workpiece, the axial dimensions of the crown section and legs lying in a common arcuate cross-sectional path when viewed in planes generally perpendicular to the longitudinal axis of the staple, said crown and leg portions being generally the same thickness, clamping ears formed intEgral with the crown and extending outwardly therefrom, said ears lying in a common longitudinal plane which intersects the arcuate path to distribute the clamping load in a plane different than the place of the penetration of the legs.
Claim 3
Dependent Claim
49 words
A metal-penetrating staple in accordance with claim 1 wherein the longitudinal edges which include the locking means face one another permitting the legs to diverge upon entering a workpiece while being biased toward one another to force the locking means to lockingly engage the under surface of a workpiece.
Claim 4
Dependent Claim
52 words
A metal-penetrating staple in accordance with claim 1, wherein the uppermost edge of the clamping ears is coplanar with the uppermost extremity of the crown portion and the lowermost edge of the ears taper upwardly from the outside edge of the legs to generally intersect with the uppermost edge of said ears.
Claim 5
Dependent Claim
25 words
A metal-penetrating staple in accordance with claim 1, wherein the locking means include a plurality of teeth located along the longitudinal edge of the leg.
Claim 6
Dependent Claim
24 words
A metal-penetrating staple in accordance with claim 1, wherein the width of the crown portion is greater than the combined width of the legs.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |