US3784151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formwork for use in supporting shuttering
Assignee: RMD Kwikform Ltd
•
Filing: 1972-04-24
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Granted: 1974-01-08
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Expires: 1992-04-24
Abstract
Abstract Formwork for supporting shuttering panels for forming concrete floors and the like, comprising vertical props, between the heads of which extend shuttering supporting beams, the beams and heads having upstanding edge flanges for engaging with dependent projections on the ends of shuttering supporting transoms which extend between the prop heads and/or the beams.
Inventors
- 👤 R Steele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:26
CPC Classifications
E; E04; E04G; E04G11/00; E04G11/36; E04G11/48; E04G11/486; E04G25/00; E04G25/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
215 words
Formwork for use in supporting concrete-forming shuttering panels comprising a. a plurality of horizontally spaced vertically disposed beam supporting props, each having at its upper end a beam supporting head with four lateral edges and a respective upstanding flange extending along each such edge. b. a plurality of mutually parallel beams for supporting the shuttering panels and extending horizontally between the beam supporting heads of props, said beam having i. at their upper sides a respective shuttering panel engaging face, ii. at their opposite ends a respective dependant projection overlapping the upstanding flange of an adjacent one of said prop heads at the side of said flange remote from said beam, and iii. along their lateral edges upstanding flanges disposed in alignment with said prop head upstanding flanges which are adjacent to said prop head upstanding flanges which the beam end dependant projections overlap, and c. a plurality of transoms for additional supporting the shuttering panels and extending transversely to said beams, said transoms each having i. at their upper sides a shuttering panel engaging face level with said shuttering panel engaging faces of said beams, and ii. at their opposite ends a respective dependant projection overlapping the upstanding flange of either one of said beams or one of said prop heads in alignment therewith.
Claim 2
Dependent Claim
215 words
Formwork for use in supporting concrete-forming shuttering panels comprising a. a plurality of horizontally spaced vertically disposed beam supporting props, each having at its upper end a beam supporting head with four lateral edges and a respective upstanding flange extending along each such edge. b. a plurality of mutually parallel beams for supporting the shuttering panels and extending horizontally between the beam supporting heads of props, said beam having i. at their upper sides a respective shuttering panel engaging face, ii. at their opposite ends a respective dependant projection overlapping the upstanding flange of an adjacent one of said prop heads at the side of said flange remote from said beam, and iii. along their lateral edges upstanding flanges disposed in alignment with said prop head upstanding flanges which are adjacent to said prop head upstanding flanges which the beam end dependant projections overlap, and c. a plurality of transoms for additional supporting the shuttering panels and extending transversely to said beams, said transoms each having i. at their upper sides a shuttering panel engaging face level with said shuttering panel engaging faces of said beams, and ii. at their opposite ends a respective dependant projection overlapping the upstanding flange of either one of said beams or one of said prop heads in alignment therewith.
Claim 3
Dependent Claim
66 words
Formwork as claimed in claim 1, wherein said beams further comprise, at opposite lateral edges of said shuttering panel engaging faces thereof dependant sides, and at the lower edges of said dependant sides outwardly extending flanges terminating in said upstanding flanges thereof spaced from the adjacent dependant side of the beam to define a respective channel in which said transom end dependant projection can be received.
Claim 4
Dependent Claim
38 words
Formwork as claimed in claim 1, wherein said beam end dependant projections and said transom end dependant projections each comprise a respective flange extending transversely of the length of the beam or transom on which it is provided.
Claim 5
Dependent Claim
70 words
Formwork according to any of claim 1, characterised in that the props are provided with means for lowering their respective beam supporting heads relative to the props, the arrangement permitting of the beams and transoms being lowered at one and the same operation by the lowering merely of the prop supporting heads to effect removal of the beams and transoms after the concrete has sufficiently seT as to allow this.
Claim 6
Dependent Claim
57 words
Formwork according to claim 4, characterised in that the props are provided at their upper extremities with concrete supporting caps with provision for lowering the beam supporting heads relative to the caps to provide local support for the concrete at the positions of the props during its final setting after the beams and transoms have been removed.
Claim 7
Dependent Claim
74 words
Formwork according to claim 4, characterised in that the means for lowering the beam supporting heads relative to the props comprise means arranged to effect progressive initial lowering of the heads with these still held against vertical downward sliding movement relative to their respective props and then to allow the heads to be slidden axially downwardly through a limited distance relative to their respective props to facilitate rapid removal of the beams and transoms.
Claim 8
Dependent Claim
80 words
Formwork according to claim 4, characterised in that each beam supporting head is provided with guide means which engages with a portion of the prop at at least two positions spaced axially along the length of the prop portion so as to maintain opposite lateral edges of each axially slidable beam supporting head at the same horizontal level during its downward axial movement relative to the prop irrespective of any eccentricity of the loading of the head from the beams.
Claim 9
Dependent Claim
77 words
Formwork according to claim 7, characterised in that the upper end portion of each prop comprises a tubular portion and the guide means comprises a tube in axially slidable engagement with the interior of said tubular portion of the prop, said guide means tube being carried on a web portion of the supporting head which extends transversely through a pair of axially extending slots formed in diametrically opposite sides of said tubular end portion of the prop.
Claim 10
Dependent Claim
76 words
Formwork according to claim 7, characterised in that the guide means of each beam supporting head comprises a pair of guide portions which extend annularly around the upper end portion of the prop at positions spaced axially thereof, each annular guide portion having its diametrically opposite sides joined by a transverse web portion which extends through an axially slotted part of the prop end portion in slidable engagement with the axially extending edges of the slot.
Claim 11
Dependent Claim
81 words
Formwork according to claim 7, characterised in that the upper end portion of each prop is of tubular form and embodies a pair of diametrically opposed axially extending slots, and the guide means of each beam supporting head comprise a tubular part in axially slidable engagement with the exterior of the prop end portion, and having a pair of axially extending lugs, the lateral edges of which are in axially slidable engagement with the vertical edges of said diametrically opposed slots.
Claim 12
Dependent Claim
64 words
Formwork according to claim 1, characterised in that the props are provided at a position below their beam supporting heads with additional means for supporting some of said beams at a horizontal level below that of the remaining beams so as to provide a support for shuttering for forming a dependent rib on the underside of the concrete floor, roof, or on the ceiling.
Claim 13
Dependent Claim
76 words
Formwork according to claim 1, characterised in that some of the beams comprise cantilever beams having a dependent prop head engaging projection at one end only, with means for supporting the other end of each cantilever beam from the associated prop, comprising a strut arranged to extend at an inclination to the vertical between the said other end of the cantilever beam, and additional supporting means at a position below the level of the prop heads.
Claim 14
Dependent Claim
60 words
Formwork according to claim 1, charterised in that the panel engaging faces at the upper sides of the beams are formed at the lateral portions of these upper sides with shuttering panel locating shoulders which extend longitudinally of the beams and are of a vertical depth corresponding to the thickness of the shuttering panels to be supported by the formwork.
Claim 15
Dependent Claim
34 words
Formwork according to claim 13, charActerised in that the shuttering panel locating shoulders are provided by shuttering forming strips of width less than the upper sides of the beams and secured to said sides.
Claim 16
Dependent Claim
26 words
Formwork according to claim 1, characterised in that the upper sides of the beams and transoms are formed with holes for receiving shuttering panel fastening members.
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |