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US3702578A
Expired / Lapsed
US
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Quick change screed extension for paving machines
Assignee: BLAW-KNOX CONSTRUCTION Corp
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Filing: 1971-02-17
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Granted: 1972-11-14
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Expires: 1991-02-17
Abstract
Abstract The invention relates to an apparatus adapted to be attached to the screed of a paving machine, to form a lateral extension thereof. The construction of the screed extension particularly takes into account that it customarily will be installed and removed in the field, possibly by unskilled labor. Thus, provisions are made for the installation and removal of the screed extension, utilizing tools and equipment readily available in the field. Since the surfacing plate of the screed extension must align accurately with that of the main screed, an adjustable adapter plate is provided, which may be installed and adjusted in the first instance in the contractor''s shop. Thereafter, mounting of the screed extension to the preadjusted adapter plate, is effected by a combination of tapered locating pins and keeper wedges.
Inventors
- 👤 Donald R Davin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:09
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/22; E01C19/42; E01C2301/00; E01C2301/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A screed extension assembly for a paving machine, which comprises a. an adapter member for attachment to the main screed of the paving machine, b. means for semi-permanently securing the adapter member to the screed in a preadjusted orientation, comprising first and second eccentric bolt means securing spaced portions of the adapter member to the screed, c. a screed extension unit including a bottom plate and a side structure, d. a plurality of complementary sets of tapered pins and sockets on the adapter member and on the screed extension side structure for joining said adapter plate and screed extension in predetermined alignment, and e. wedge-like retaining means for securing said pins in said sockets.
Claim 2
Dependent Claim
114 words
A screed extension assembly for a paving machine, which comprises a. an adapter member for attachment to the main screed of the paving machine, b. means for semi-permanently securing the adapter member to the screed in a preadjusted orientation, comprising first and second eccentric bolt means securing spaced portions of the adapter member to the screed, c. a screed extension unit including a bottom plate and a side structure, d. a plurality of complementary sets of tapered pins and sockets on the adapter member and on the screed extension side structure for joining said adapter plate and screed extension in predetermined alignment, and e. wedge-like retaining means for securing said pins in said sockets.
Claim 3
Dependent Claim
56 words
The screed extension assembly of claim 1, further characterized by a. said tapered pins extending entirely through and projecting beyond said sockets, b. said tapered pins being provided with slotted transverse openings, c. said wedge-like retaining means comprising keeper wedges received in said slotted openings and operative to force said pins tightly into said tapered openings.
Claim 4
Dependent Claim
61 words
The screed extension assembly of claim 2, further characterized by a. said tapered pins being carried by said screed extension and projecting generally vertically upward, b. said sockets being formed by lugs on said adapter member and being generally vertically aligned for reception over said pins, and c. said keeper wedges extending generally horizontally through said slotted openings, above said lugs.
Claim 5
Dependent Claim
61 words
The screed extension assembly of claim 3, further characterized by said keeper wedges being formed to provide a. a generally flat lower surface for engagement with said lugs, b. a leading upper surface portion forming a relatively larger taper angle with the lower surface, and c. a following upper surface portion forming a relatively smaller taper angle with said lower surface.
Claim 6
Dependent Claim
72 words
The screed extension assembly of claim 1, further characterized by a. one of said screed and adapter members having slotted openings of a first orientation for receiving said eccentric bolt means, b. third bolt means securing said screed and adapter members at a point spaced from said eccentric bolt means, and c. one of said screed and adapter having a slotted opening of a second orientation for receiving said third bolt means.
Claim 7
Dependent Claim
94 words
The screed extension assembly of claim 1, further characterized by a. said sockets being formed by lugs on said adapter member, b. at least certain of said lugs being spaced and located alternatively to receive tapered pins of an edger plate mount, c. said screed extension having an external side structure including lugs corresponding in spacing and location to said certain lugs, and d. an edger plate mount having upwardly extending tapered pins adapted for alternative reception in said certain lugs of the adapter member or in the corresponding lugs of the screed extension.
Claim 8
Dependent Claim
135 words
A screed extension assembly for a paving machine, which comprises a. a screed extension unit including a bottom plate and a side structure, b. complementary sets of tapered pins and sockets oriented on generally vertical axes and associated with the paving machine screed and the screed extension for securing the screed extension to the screed in a predetermined orientation, c. wedge-like retainers for securing the tapered pins and sockets in assembled relation, d. adapter plate means mounted on one of said screed or screed extension and mounting the tapered pins or sockets associated therewith, e. adjustable securing means for semi-permanently mounting said adapter plate means, and f. said pins and sockets being so arranged that insertion of the pins into the sockets is effected by upward movement of the screed extension relative to the screed.
Claim 9
Dependent Claim
135 words
A screed extension assembly for a paving machine, which comprises a. a screed extension unit including a bottom plate and a side structure, b. complementary sets of tapered pins and sockets oriented on generally vertical axes and associated with the paving machine screed and the screed extension for securing the screed extension to the screed in a predetermined orientation, c. wedge-like retainers for securing the tapered pins and sockets in assembled relation, d. adapter plate means mounted on one of said screed or screed extension and mounting the tapered pins or sockets associated therewith, e. adjustable securing means for semi-permanently mounting said adapter plate means, and f. said pins and sockets being so arranged that insertion of the pins into the sockets is effected by upward movement of the screed extension relative to the screed.
Claim 10
Dependent Claim
70 words
The screed extension assembly of claim 7, further characterized by said adjustable securing means including a. at least two eccentric bolts located in spaced relation for effecting upward and downward adjustment of the forward and rear portions of the adapter plate means, and b. at least one bolt, which may be one of the above-mentioned eccentric bolts, providing laterally inward or outward adjustment of upper portions of the screed extension.
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) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |