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US3915423A Expired / Lapsed US ⏱️ 0.0 years remaining

Formwork fitment for a prop

Assignee: Acrow Engineers Ltd
•
Filing: 1974-06-24
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Granted: 1975-10-28
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Expires: 1994-06-24
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Abstract

Abstract A builders prop or a fitment for a prop comprising a head plate which is connected to the prop body, or to a base plate to be secured to a standard prop head plate by a shank, the shank carrying both a support tube which is slidably and rotatably engaged over the shank, and a shuttering element support member, the support tube or shank being formed with an angularly inclined surface to engage a member extending from the shank or tube respectively, the arrangement being such that rotation of the support tube around the shank raises or lowers the support tube relative to the head plate, the shuttering element support member being so shaped and arranged as to be supported by the support tube relative to the shank and in a second angular or ''''strip'''' position of the support tube around the shank, the shuttering element support member being free to slide down the shank away from the head plate.

Inventors

  • 👤 Jack Raymond Tooley

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 10:53
CPC Classifications
E; E04; E04G; E04G19/00; E04G11/00; E04G11/36; E04G11/48; E04G11/486; E04G25/00

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 306 words
A fitment for a prop, said fitment being adapted to support at least one shuttering element of the type used with concrete formwork, said fitment being movable between a full support position, and preliminary and full strip positions, said fitment comprising a shank having a headplate fixed to the top end thereof, said shank being connectable to said prop in fixed relation thereto, a support tube slidably and rotatably disposed in coaxial relation with said shank, a shuttering tube slidably disposed in coaxial relation with said shank and said support tube, said shuttering tube mounting at least one shuttering support member thereon, at least one support ear mounted to one of said support tube and said shuttering tube and extending substantially radially therefrom, and the other of said support tube and said shuttering tube defining at least one ear slot adapted to receive said support ear therein, said support ear cooperating with a contact surface on that tube to which said ear is not fixed to maintain said support and shuttering tubes in the full support position, anti-rotation means interconnecting said shank and said shuttering tube, said anti-rotation means permitting sliding motion of said shuttering tube relative to said support tube, but preventing rotational motion of said shuttering tube relative to said support tube, and cam means interconnecting said shank and said support tube, initial rotation of said support tube relative to said shank and said shuttering tube causing said cam means to lower slightly said shuttering tube away from said headplate to the preliminary strip position, and further rotation of said support tube relative to said shank causing said support tube''s ear to move out of contact with said contact surface into alignment with said shuttering tube''s ear slot causing said shuttering tube to drop further away from said headplate into the full strip position.
Claim 2
Dependent Claim 306 words
A fitment for a prop, said fitment being adapted to support at least one shuttering element of the type used with concrete formwork, said fitment being movable between a full support position, and preliminary and full strip positions, said fitment comprising a shank having a headplate fixed to the top end thereof, said shank being connectable to said prop in fixed relation thereto, a support tube slidably and rotatably disposed in coaxial relation with said shank, a shuttering tube slidably disposed in coaxial relation with said shank and said support tube, said shuttering tube mounting at least one shuttering support member thereon, at least one support ear mounted to one of said support tube and said shuttering tube and extending substantially radially therefrom, and the other of said support tube and said shuttering tube defining at least one ear slot adapted to receive said support ear therein, said support ear cooperating with a contact surface on that tube to which said ear is not fixed to maintain said support and shuttering tubes in the full support position, anti-rotation means interconnecting said shank and said shuttering tube, said anti-rotation means permitting sliding motion of said shuttering tube relative to said support tube, but preventing rotational motion of said shuttering tube relative to said support tube, and cam means interconnecting said shank and said support tube, initial rotation of said support tube relative to said shank and said shuttering tube causing said cam means to lower slightly said shuttering tube away from said headplate to the preliminary strip position, and further rotation of said support tube relative to said shank causing said support tube''s ear to move out of contact with said contact surface into alignment with said shuttering tube''s ear slot causing said shuttering tube to drop further away from said headplate into the full strip position.
Claim 3
Dependent Claim 47 words
A fitment as set forth in claim 1, said anti-rotation means comprising an anti-rotation slot defined in one of said support and shuttering tubes, and an anti-rotation pin fixed to the other of said support and shuttering tuBes, said anti-rotation pin being received in said anti-rotation slot.
Claim 4
Dependent Claim 48 words
A fitment as set forth in claim 1, said cam means comprising a cam surface defined in one of said support and shuttering tubes, and a cam pin fixed to the other of said support and shuttering tubes, said cam pin being in contact with said cam surface.
Claim 5
Dependent Claim 27 words
A fitment as set forth in claim 1, said fitment''s full strip position being established by one of support ear/ear slot structure and said anti-rotation means structure.
Claim 6
Dependent Claim 30 words
A fitment as set forth in claim 1 including a handle fixed to said support tube, said handle permitting manual rotation of said support tube relative to said shuttering tube.
Claim 7
Dependent Claim 46 words
A fitment as set forth in claim 1, said ear being positioned relative to said ear slot in said fitment''s full support position so as to require rotation of said support tube through about 90* prior to achieving alignment of said ear with said ear slot.
Claim 8
Dependent Claim 32 words
A fitment as set forth in claim 6, there being at least two ears and at least two ear slots, said ears and ear slots being symmetrically disposed relative to said shank.

References Cited (Backward Citations)

US3239188A Cited
US3784151A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-10-27 1979-04-28 1979-10-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-10-27 1983-04-28 1983-10-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-10-27 1987-04-28 1987-10-28 $7700.00 Window Closed / Lapsed

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