Patent US1911362A successfully refreshed from Google Patents.
US3751079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fifth wheel plate assembly
Assignee: Pullman Standard Inc
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Filing: 1971-10-27
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Granted: 1973-08-07
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Expires: 1991-10-27
Abstract
Abstract A fifth wheel plate assembly for trailer hitches securing trailers to railway flat cars includes a top plate having an opening in which a movable lock jaw is supported for grasping and locking the kingpin of a trailer to the fifth wheel. The lock jaw is provided with extensions which are connected to a suitable screw type actuating assembly for moving the jaw to its closed position. In the closed position the jaws are locked by means of a lock bolt assembly which is moved into engaging position with the extensions to lock the jaw against movement. A lock bolt assembly also includes an indicating and latch assembly which in turn locks the locking bolt in the engaging position and indicates visually that it is locked.
Inventors
- 👤 W Marulic
- 👤 R Ferris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:55
CPC Classifications
B; B61; B61D; B61D45/00; B61D45/001; B61D45/004; B61D45/005; Y; Y10; Y10T; Y10T403/00; Y10T403/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
242 words
A fifth wheel for connection to the kingpin of a highway trailer comprising: a top plate having a substantially rectangular opening including parallel side walls and converging walls connected by an arcuate wall position, slide supports supported below said plate adjacent said side walls of said opening, a first clamping block including slide means supporting said block on said slide supports for movement within said opening, said block including an open end recess, a second stationary clamping block supported below said plate and including a surface cooperating with said open end recess during a locked position of said blocks to hold a kingpin in confined relation, said slide means including an extension connected to said first block and projecting longitudinally relative to said opening, drive means connected to said extension for moving said first block from and to said locked position, a lock assembly including a locking bolt, means slidingly supporting said bolt on said plate for movement relative to said extension, handle means on said locking bolt for moving the same, keeper means on said extension engageable by said bolt for maintaining said blocks in said locked position, and a movable latch means supported on said top plate, said movable latch means in one position blocking movement of said handle to retain said locking bolt in said engaging position, said latch means being manually movable to a second position to permit movement of said handle and bolt to an unlocked position.
Claim 2
Dependent Claim
242 words
A fifth wheel for connection to the kingpin of a highway trailer comprising: a top plate having a substantially rectangular opening including parallel side walls and converging walls connected by an arcuate wall position, slide supports supported below said plate adjacent said side walls of said opening, a first clamping block including slide means supporting said block on said slide supports for movement within said opening, said block including an open end recess, a second stationary clamping block supported below said plate and including a surface cooperating with said open end recess during a locked position of said blocks to hold a kingpin in confined relation, said slide means including an extension connected to said first block and projecting longitudinally relative to said opening, drive means connected to said extension for moving said first block from and to said locked position, a lock assembly including a locking bolt, means slidingly supporting said bolt on said plate for movement relative to said extension, handle means on said locking bolt for moving the same, keeper means on said extension engageable by said bolt for maintaining said blocks in said locked position, and a movable latch means supported on said top plate, said movable latch means in one position blocking movement of said handle to retain said locking bolt in said engaging position, said latch means being manually movable to a second position to permit movement of said handle and bolt to an unlocked position.
Claim 3
Dependent Claim
29 words
The invention in accordance with claim 1, said extension comprising a pair of laterally spaced bars, said keeper means comprising first openings in said bars engaged by said bolt.
Claim 4
Dependent Claim
42 words
The invention in accordance with claim 2, including guideway means carried beneath said plate engaged by said bars in sliding relation, said guideway means including a second opening respectively in registry with said first openings and being also engaged by said bolt.
Claim 5
Dependent Claim
35 words
The invention in accordance with claim 3, said bolt comprising a pair of bolt elements spaced longitudinally endwise and respectively engageable with said first and second openings, and a bridging member connecting said bolt elements.
Claim 6
Dependent Claim
55 words
The invention in accordance with claim 1, said latch means comprising a member hingedly connected to said top plate, and vertically depending therefrom in said blocking position, and extending substantially horizontally in said second position, said bolt and handle being rotatable about a horizontal axis upon movement of said hinged member to said second position.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |