Patent US4143876A successfully refreshed from Google Patents.
US4143876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrowhead with replaceable auxiliary blade
Assignee: Individual
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Filing: 1977-03-24
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Granted: 1979-03-13
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Expires: 1997-03-24
Abstract
Abstract This hunting arrowhead has a pair of opposed flanged longitudinally-slotted ferrule halves with a slotted main blade held between them and a tapered socket rearwardly thereof for receiving the end of the shaft. Insertable by a sliding motion into the slots in the ferrule halves is a generally triangular auxiliary blade having a continuous and unbroken rim and containing an elongated narrow tapered slot into which snap lugs or wings along one edge of the ferrule slots which are otherwise of elongated narrow pointed shape. The rearward end of the auxiliary blade terminates in a truncated obtuse-angled end which, when the auxiliary blade is fully seated in the ferrule slots, lies close to the rearward blunt ends of the ferrule slots. A dull or damaged auxiliary blade is removed and replaced by reversing the sliding motion employed in its insertion.
Inventors
- 👤 Edward J. Henkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:24
CPC Classifications
F; F42; F42B; F42B6/00; F42B6/02; F42B6/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
An arrowhead, comprising an elongated ferrule having a rearward socket adapted to receive the forward end of an arrow shaft and having a forward portion with a main blade mounted thereon and having an intermediate portion with a pair of transversely-aligned slots therein disposed transverse to said main blade and extending longitudinally through said ferrule. said main blade having an opening therethrough disposed substantially in alignment with said slots, and an approximately triangular auxiliary blade which is shorter and thinner than said slots having a longitudinally-elongated forwardly-tapering central aperture therein and an unbroken peripheral portion extending continuously around said central aperture, at least one of said slots having a detent projection extending inward from one edge thereof into said central aperture into gripping engagement with said forwardly-tapering edge portion thereof in response to the rearward sliding of said auxiliary blade during the insertion of said auxiliary blade.
Claim 2
Dependent Claim
147 words
An arrowhead, comprising an elongated ferrule having a rearward socket adapted to receive the forward end of an arrow shaft and having a forward portion with a main blade mounted thereon and having an intermediate portion with a pair of transversely-aligned slots therein disposed transverse to said main blade and extending longitudinally through said ferrule. said main blade having an opening therethrough disposed substantially in alignment with said slots, and an approximately triangular auxiliary blade which is shorter and thinner than said slots having a longitudinally-elongated forwardly-tapering central aperture therein and an unbroken peripheral portion extending continuously around said central aperture, at least one of said slots having a detent projection extending inward from one edge thereof into said central aperture into gripping engagement with said forwardly-tapering edge portion thereof in response to the rearward sliding of said auxiliary blade during the insertion of said auxiliary blade.
Claim 3
Dependent Claim
54 words
An arrowhead, according to claim 1, wherein the other of said slots also has a detent projection extending inward from another edge portion thereof into said central aperture into gripping engagement with said forwardly-tapering edge portion thereof in response to the rearward sliding of said auxiliary blade during the insertion of said auxiliary blade.
Claim 4
Dependent Claim
30 words
An arrowhead, according to claim 1, wherein at least one of said slots also has a blade-locating projection extending inward from one edge thereof into engagement with said peripheral portion.
Claim 5
Dependent Claim
51 words
An arrowhead, according to claim 3, wherein said one slot has its edge opposite said one edge extending obliquely away from said one edge and has a second projection extending inward from said obliquely-extending edge toward said blade-locating projection in spaced relationshp therewith for the reception of said auxiliary blade therebetween.
Claim 6
Dependent Claim
24 words
An arrowhead, according to claim 1, wherein said one slot has its edge opposite said one edge extending obliquely away from said one edge.
Claim 7
Dependent Claim
18 words
An arrowhead, according to claim 1, wherein said one slot has an enlargement thereof at one end thereof.
Claim 8
Dependent Claim
18 words
An arrowhead, according to claim 1, wherein said one slot has an enlargement thereof at both ends thereof.
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) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |