Patent US4004874A successfully refreshed from Google Patents.
US4004874A
Expired / Lapsed
US
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Apparatus for production of cast concrete members
Assignee: Span Deck Inc
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Filing: 1974-06-19
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Granted: 1977-01-25
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Expires: 1994-06-19
Abstract
Abstract Concrete structural members are cast in a metal mold form which comprises side members closed off by a horizontally extending resilient pallet. The side members have affixed thereto at their lower ends adjustable swivel arm actuating mechanisms adapted to flex the side members laterally away from one another to enable stripping of the cast member from the form. The resilient pallet forms the bottom surface of the mold form and etablishes a seal to prevent slurry leakage. The pallet is supported by a roller transfer assembly that enables the cast member to be transported to another operating station after the cast member has been stripped from the form. The transfer assembly is adjustable in height by means of a swing arm assembly which in addition to setting the depth of the casting also causes the cast member to be elevated clear of the form to enable it to be removed therefrom.
Inventors
- 👤 Larry W. Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:03
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/24; B28B7/241; B28B7/246; B28B7/0029; B28B7/0035; B28B7/0044; B28B7/06; Y; Y10; Y10S; Y10S425/00; Y10S425/106
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
378 words
Apparatus for the production of cast concrete structural members comprising a stress frame, a mold form open from the top to receive a fluid concrete mix and carried by said frame, said mold form including at least one pair of substantially vertically disposed spaced side members closed off at opposite end and a horizontally disposed pallet closing off the lower end of the mold form, a side member springing mechanism for flexing said side members laterally away from each other at the lower ends after the concrete mix has been set in said form, said springing mechanism including a first yoke pivotally connected to the lower end of one of said side members of a pair, a second yoke pivotally connected to the lower end of the other of said side members of said pair, a first and a second connecting rod each affixed at one end to said first and said second yokes, respectively, a third yoke connected to the other end of said first connecting rod, a fourth yoke connected to the other end of said second connecting rod, a drive bar, means pivotally connecting said third and said fourth yokes to said drive bar, means connected to said drive bar for actuation thereof from a first to a second position to affect flexing of said side members, a swing arm assembly for supporting said pallet, said swing arm assembly adapted to be activated to elevate the pallet and the cast member after the concrete mix has been set in said form and the side members flexed to enable the cast member to be removed from the form, said swing arm assembly including a longitudinally extending support plate depending from said pallet, a plurality of spaced frist yokes disposed beneath said support plate and being pivotally connected to said support plate, a plurality of spaced second yokes pivotally connected to said stress frame and a plurality of connecting rods each connected at opposite ends to one of said plurality of first yokes and one of said plurality of second yokes, hydraulic actuating means connected to said support plate for displacing said support plate lengthwise of the form and thereby activating said swing arm assembly to elevate said pallet and the cast member set in the form.
Claim 2
Dependent Claim
378 words
Apparatus for the production of cast concrete structural members comprising a stress frame, a mold form open from the top to receive a fluid concrete mix and carried by said frame, said mold form including at least one pair of substantially vertically disposed spaced side members closed off at opposite end and a horizontally disposed pallet closing off the lower end of the mold form, a side member springing mechanism for flexing said side members laterally away from each other at the lower ends after the concrete mix has been set in said form, said springing mechanism including a first yoke pivotally connected to the lower end of one of said side members of a pair, a second yoke pivotally connected to the lower end of the other of said side members of said pair, a first and a second connecting rod each affixed at one end to said first and said second yokes, respectively, a third yoke connected to the other end of said first connecting rod, a fourth yoke connected to the other end of said second connecting rod, a drive bar, means pivotally connecting said third and said fourth yokes to said drive bar, means connected to said drive bar for actuation thereof from a first to a second position to affect flexing of said side members, a swing arm assembly for supporting said pallet, said swing arm assembly adapted to be activated to elevate the pallet and the cast member after the concrete mix has been set in said form and the side members flexed to enable the cast member to be removed from the form, said swing arm assembly including a longitudinally extending support plate depending from said pallet, a plurality of spaced frist yokes disposed beneath said support plate and being pivotally connected to said support plate, a plurality of spaced second yokes pivotally connected to said stress frame and a plurality of connecting rods each connected at opposite ends to one of said plurality of first yokes and one of said plurality of second yokes, hydraulic actuating means connected to said support plate for displacing said support plate lengthwise of the form and thereby activating said swing arm assembly to elevate said pallet and the cast member set in the form.
Claim 3
Dependent Claim
42 words
Apparatus as set forth in claim 1 wherein said first and said second connecting rods of the springing mechanism are threaded at opposite ends and said first and said second yokes are correspondingly threaded to receive the threaded ends of said rods.
Claim 4
Dependent Claim
47 words
Apparatus as set forth in claim 1 wherein each of said plurality of connecting rods of said swing arm assembly is threaded at one of its ends and each of said plurality of said first yokes is correspondingly threaded to receive the threaded end of said rod.
Claim 5
Dependent Claim
58 words
Apparatus as set forth in claim 1 wherein said support plate includes a plurality of depending haunches, and wherein spaced pairs of laterally extending guide plates are affixed to the frame and spaced from each other on opposite sides of the support plate for guiding the support plate and maintaining the form stabilized when the pallet is elevated.
References Cited (Backward Citations)
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Cited
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Cited
US3168771A
Cited
US3645490A
Cited
US3815861A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |