US3584824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable twist lock
Assignee: DORSEY TRAILER Co
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Filing: 1968-08-02
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Granted: 1971-06-15
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Expires: 1988-08-02
Abstract
Abstract An adjustable twist lock for coupling a cargo container to a platform. The twist lock is adapted to secure containers having corner fittings constructed in accordance with differing standards.
Inventors
- 👤 Roy C Belcer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:25
CPC Classifications
B; B60; B60P; B60P7/00; B60P7/06; B60P7/13; B60P7/132; B61; B61D; B61D45/00; B61D45/007; B63; B63B; B63B25/00; B63B25/28
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
142 words
An adjustable twist lock for securing a container to a platform, said container having corner fittings on its lower corners, said twist lock comprising: a bolster secured to said platform; a locking member rotatably mounted in said bolster, said locking member being longitudinally movable in said bolster between a first operative position and a distinct second operative position; and spacer means adapted to removably engage said locking member and to selectively and positively maintain said locking member in each of said first and second operative positions; said locking member, when in said first operative position, being adapted to secure to said platform a container having corner fittings formed with bottom walls having a first thickness, and when in said second operative position, being adapted to secure to said platform a container having corner fittings formed with bottom walls having a second thickness.
Claim 2
Dependent Claim
142 words
An adjustable twist lock for securing a container to a platform, said container having corner fittings on its lower corners, said twist lock comprising: a bolster secured to said platform; a locking member rotatably mounted in said bolster, said locking member being longitudinally movable in said bolster between a first operative position and a distinct second operative position; and spacer means adapted to removably engage said locking member and to selectively and positively maintain said locking member in each of said first and second operative positions; said locking member, when in said first operative position, being adapted to secure to said platform a container having corner fittings formed with bottom walls having a first thickness, and when in said second operative position, being adapted to secure to said platform a container having corner fittings formed with bottom walls having a second thickness.
Claim 3
Dependent Claim
101 words
The adjustable twist lock recited in claim 1, wherein: said locking member is formed with an elongated shank and an enlarged head; said bolster includes a flange having a hole therethrough, said locking member shank extending through said hole perpendicular to the plane of said flange; said locking member shank is formed with spaced first and second washers situated on either side of said flange, the space between said washers being substantially greater than the thickness of said flange, said washers thereby preventing said locking member from being removed from said bolster and restricting the longitudinal movement thereof in said hole.
Claim 4
Dependent Claim
51 words
The adjustable twist lock recited in claim 2 wherein: said spacer means is adapted to be removably inserted between said flange and said first washer to secure said locking member in said first position and between said flange and said second washer to secure said locking member in said second position.
Claim 5
Dependent Claim
89 words
The adjustable twist lock recited in claim 1, wherein: said locking member is formed with an elongated shank and an enlarged head; said bolster is a rectangular structure having first and second parallel flanges each having a hole therethrough, shaped to receive said shank, an end plate and a cap plate, said end plate and cap plate being parallEl to each other and normal to said flanges, said holes in said first and second flanges being in axial alignment; and said elongated shank extends through both of said flanges.
Claim 6
Dependent Claim
40 words
The adjustable twist lock recited in claim 4, wherein: said elongated shank is formed with two spaced parallel washers situated on either side of said second flange to thereby restrict the longitudinal motion of said elongated shank in said bolster.
Claim 7
Dependent Claim
42 words
The adjustable twist lock as recited in claim 5, wherein: said spacer means is adapted to be removably inserted between either of said washers and said second flange to thereby maintain said locking member in either of said first and second positions.
Claim 8
Dependent Claim
51 words
The adjustable twist lock recited in claim 4, and further comprising: a handle secured to said locking member for rotational movement thereof; and stop means pivotably secured to said first flange, said stop means being adapted to selectively allow rotation of said locking member and prevent rotation of said locking member.
Claim 9
Dependent Claim
90 words
The adjustable twist lock recited in claim 7, wherein: said locking member is rotatable between locked and unlocked positions by means of said handle; accidental rotation of said locking member in said locked position is prevented by one edge of said end plate and one edge of said stop means abutting opposed sides of said handle; and accidental rotation of said locking member in said unlocked position is prevented by one edge of said cap plate and the other edge of said stop means abutting opposed sides of said handle.
Claim 10
Dependent Claim
50 words
The adjustable twist lock recited in claim 8, wherein: said second flange is formed with a spring catch; and said spacer means is formed with a spring clip adapted to engage said spring catch to thereby secure said spacer means to said bolster when in engagement with said elongated shank.
Claim 11
Dependent Claim
133 words
An adjustable twist lock, comprising: a platform adapted to receive a container having corner fittings on its lower corners; a locking member rotatably mounted on said platform, said locking member being longitudinally movable with respect to said platform between a first operative position and a distinct second operative position; and spacer means removably engaging said locking member and adapted to selectively and positively maintain said locking member in each of said first and second operative positions; said locking member being adapted, when in said first operative position, to secure to said platform a container having corner fittings formed with bottom walls of a first thickness, and further being adapted, when in said second operative position, to secure to said platform a container having corner fittings formed with bottom walls of a second thickness.
Claim 12
Dependent Claim
133 words
An adjustable twist lock, comprising: a platform adapted to receive a container having corner fittings on its lower corners; a locking member rotatably mounted on said platform, said locking member being longitudinally movable with respect to said platform between a first operative position and a distinct second operative position; and spacer means removably engaging said locking member and adapted to selectively and positively maintain said locking member in each of said first and second operative positions; said locking member being adapted, when in said first operative position, to secure to said platform a container having corner fittings formed with bottom walls of a first thickness, and further being adapted, when in said second operative position, to secure to said platform a container having corner fittings formed with bottom walls of a second thickness.
Claim 13
Dependent Claim
78 words
The adjustable twist lock recited in claim 10, wherein: said locking member is formed with an elongated shank and an enlarged head; said platform is formed with a flange having a hole therein; and said locking member shank is mounted in said hole, said shank being formed with spaced first and second washers situated on either side of said flange to thereby positively limit the longitudinal movement of said locking member between said first and second operative positions.
Claim 14
Dependent Claim
41 words
The adjustable twist lock recited in claim 11, wherein: said spacer means is adapted to be selectively removably inserted between either of said washers and said flange to thereby maintain said locking member in either of said first and second positions.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |