US3602471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible spike
Assignee: United States Department of the Navy
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Filing: 1969-09-19
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Granted: 1971-08-31
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Expires: 1989-09-19
Abstract
Abstract A spike erectable from a collapsed or telescoped condition to a fully extended, locked condition for use with an elongated package which is to be partially implanted in the ground after dropping or launching from an aircraft. The spike includes two tubular stages and a third stage terminating in a conical point, the stages being telescopable one within the other. Spring-loaded plungers are carried by the stages for movement into annular grooves formed in adjacent stages to effect locking engagement therewith, and the stages carry fixed pins to limit the degree of relative extension of the stages.
Inventors
- 👤 Edgar A Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:37
CPC Classifications
B; B64; B64D; B64D1/00; B64D1/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
216 words
A spike comprising: a tubular member having an annular groove circumscribed about the interior lateral periphery thereof and a plurality of grooves longitudinally extending along said periphery; a piercing member having a cylindrical portion terminating in a conical end formed for soil impalement, having an opposite end slidably received within said tubular member and being movable from a telescoped position to an extended position, and having ducting formed therethrough extending from the exterior of said conical end to said opposite end received within said tubular member, and a plurality of plunger bores formed therein radially extending into said cylindrical portion; a plurality of plungers each received in a respective said plunger bore; a plurality of springs interposed in said plunger bores to urge said plungers to partially protrude from said cylindrical portion of said piercing member, said plungers being received in locking position by said annular groove when said members are in said extended configuration; and a plurality of first stop pins protruding from said piercing member slidably received in said longitudinal grooves and being positioned to engage the outmost edge of said annular groove when said plungers are registered with said annular groove, said longitudinal grooves being sufficiently long to enable said piercing member to move to said telescoped position entirely within said tubular member.
Claim 2
Dependent Claim
216 words
A spike comprising: a tubular member having an annular groove circumscribed about the interior lateral periphery thereof and a plurality of grooves longitudinally extending along said periphery; a piercing member having a cylindrical portion terminating in a conical end formed for soil impalement, having an opposite end slidably received within said tubular member and being movable from a telescoped position to an extended position, and having ducting formed therethrough extending from the exterior of said conical end to said opposite end received within said tubular member, and a plurality of plunger bores formed therein radially extending into said cylindrical portion; a plurality of plungers each received in a respective said plunger bore; a plurality of springs interposed in said plunger bores to urge said plungers to partially protrude from said cylindrical portion of said piercing member, said plungers being received in locking position by said annular groove when said members are in said extended configuration; and a plurality of first stop pins protruding from said piercing member slidably received in said longitudinal grooves and being positioned to engage the outmost edge of said annular groove when said plungers are registered with said annular groove, said longitudinal grooves being sufficiently long to enable said piercing member to move to said telescoped position entirely within said tubular member.
Claim 3
Dependent Claim
97 words
A spike according to claim 1 further comprising: said first tubular member including fixed to the other end thereof an inwardly projecting annular flange; a plurality of spring-loaded plungers carried by said flange and being movable radially from withdrawn to locking position; and A second tubular member sized to slidingly receive said first tubular member in telescoped position therewithin and having an annular groove circumscribed about the interior lateral periphery thereof adjacent one end for receiving protruding portions of said plungers in said locking position when said first and second tubular members are in an extended configuration.
Claim 4
Dependent Claim
80 words
A spike according to claim 2 further comprising: a second stop pin carried in fixed relation by said second tubular member adjacent said annular groove; and said first tubular member having a longitudinally extending groove formed in the exterior lateral periphery thereof for slidably receiving said stop pin, said longitudinally extending groove terminating in a stop for engaging said stop pin when said plungers of said first tubular member are centered relative said annular groove of said second tubular member.
Claim 5
Dependent Claim
110 words
A spike according to claim 3 further comprising: said first and second tubular members having a plurality of key bores extending through their lateral peripheries, each said key bore being in registry with a respective said plunger when arranged in said locking position and being smaller in diameter than said plunger; said piercing member having bores for receiving and holding in fixed relation ends of respective ones of said first stop pins; and said first tubular member having additional bores extending through its lateral periphery adjacent said flange in registry with a respective said interior longitudinally extending groove, said additional bores being sized to receive therethrough said first stop pins.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |