Patent US3645490A successfully refreshed from Google Patents.
US3645490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable form for casting concrete beams
Assignee: TED NELSON CO
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Filing: 1970-10-01
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Granted: 1972-02-29
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Expires: 1990-10-01
Abstract
Abstract A plurality of form sections are connected together end-to-end for casting rectangular concrete beams on edge in horizontal position. Each form section is mounted on transverse base beams secured to a concrete foundation or floor. One side form in each form section is mounted on trolleys to roll out on the base beams away from the opposite side form. Provision is made for longitudinal expansion movement of the side forms when they are heated to cure the concrete. Each trolley is equipped with a special locking device to hold the rollout side form in different casting positions for casting beams of different widths. A grooved roller in the locking device engages a bar on a base beam to perform the three functions of locking the trolley against rollout, holding the trolley down to prevent uplift from the fluid pressure of the wet concrete and permitting movement of the locking device with longitudinal expansion and contraction of the rollout side form.
Inventors
- 👤 Robert W Beasley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:32
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
178 words
A form for casting concrete beams comprising a first side form, a plurality of base beams extending transversely of said side form, means supporting said side form on said base beams arranged to accommodate longitudinal expansion and contraction of said side form relative to said base beams, trolleys movable on said base beams toward and away from said first side form, a second side form, means supporting said second side form on said trolleys arranged to accommodate longitudinal expansion and contraction of said second side form relative to said trolleys and base beams, bars extending parallel with said side forms mounted on said base beams, grooved lock rollers on said second side form, and a lock linkage arranged to move said rollers into and out of engagement with said bars, said rollers when in engagement with said bars locking said trolleys against movement away from said first side form and locking said trolleys and second side form against uplift, and said rollers rolling on said bars to accommodate said longitudinal expansion and contraction of said second side form.
Claim 2
Dependent Claim
178 words
A form for casting concrete beams comprising a first side form, a plurality of base beams extending transversely of said side form, means supporting said side form on said base beams arranged to accommodate longitudinal expansion and contraction of said side form relative to said base beams, trolleys movable on said base beams toward and away from said first side form, a second side form, means supporting said second side form on said trolleys arranged to accommodate longitudinal expansion and contraction of said second side form relative to said trolleys and base beams, bars extending parallel with said side forms mounted on said base beams, grooved lock rollers on said second side form, and a lock linkage arranged to move said rollers into and out of engagement with said bars, said rollers when in engagement with said bars locking said trolleys against movement away from said first side form and locking said trolleys and second side form against uplift, and said rollers rolling on said bars to accommodate said longitudinal expansion and contraction of said second side form.
Claim 3
Dependent Claim
33 words
A form as defined in claim 1 including means for mounting said bars at intervals along said base beams to vary the spacing of said second side form from said first side form.
Claim 4
Dependent Claim
33 words
A form as defined in claim 2, said last means comprising a series of holes in the sides of said base beams to receive said bars at different locations along said base beams.
Claim 5
Dependent Claim
24 words
A form as defined in claim 3 including plates on said bars, and screws securing said plates to said sides of said base beams.
Claim 6
Dependent Claim
28 words
A form as defined in claim 1, said lock rollers being approximately horizontal in locked position and engaging the sides of said bars facing said first side form.
Claim 7
Dependent Claim
20 words
A form as defined in claim 1, said lock rollers being carried by pivotal arms on said second side frame.
Claim 8
Dependent Claim
37 words
A form as defined in claim 1, said bars each projecting from one side of said base beam and said lock rollers being disposeD under said second side form at said one side of said base beams.
Claim 9
Dependent Claim
56 words
A form as defined in claim 1, said second side form being mounted on the inner ends of said trolleys adjacent said first side form, a horizontal flange on each of said base beams, and antitip rollers on the outer ends of said trolleys remote from said second side form engaging the undersides of said flanges.
Claim 10
Dependent Claim
119 words
In a form for casting elongated concrete structures wherein the form is subject to longitudinal expansion and contraction, a base member, a rollout side form on said base member which is subject to an uplift force from the fluid pressure of concrete in the form, and a rollout lock for preventing rollout and uplift of said side form while permitting longitudinal expansion thereof relative to said base member; said lock comprising a longitudinal bar on said base member, a grooved roller on said side form, and a lock linkage arranged to clamp said roller in approximately horizontal position in engagement with the inside edge of said bar and to retract said roller inwardly and upwardly away from said bar.
Claim 11
Dependent Claim
119 words
In a form for casting elongated concrete structures wherein the form is subject to longitudinal expansion and contraction, a base member, a rollout side form on said base member which is subject to an uplift force from the fluid pressure of concrete in the form, and a rollout lock for preventing rollout and uplift of said side form while permitting longitudinal expansion thereof relative to said base member; said lock comprising a longitudinal bar on said base member, a grooved roller on said side form, and a lock linkage arranged to clamp said roller in approximately horizontal position in engagement with the inside edge of said bar and to retract said roller inwardly and upwardly away from said bar.
Claim 12
Dependent Claim
25 words
A form as defined in claim 9, said roller being carried by a pivotal arm on said side form for said clamping and retracting movements.
References Cited (Backward Citations)
US3010174A
Cited
US3071833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |