NZ221730A - Timber to concrete anchor - Google Patents

Description

221/30 A Patents Form No. 5 PATENTS ACT 1953 COMPLETE SPECIFICATION After Provisional Number: 221730 Dated: 9 September 1987 TIMBER TO CONCRETE AlNCHUR suflsriTuno/» of appiicant UNOEA SECTION 24 " 3 AUG 1988 r. " e i v \ v,.. : I, LAWRENCE—ALEXANDER—-BOVEr, a New Zealand citizen of 56 Fraser Street, Tauranga,New Zealand,hereby declare the invention for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- 22173 This invention relates to the securement of timber framing or plate members to concrete foundations,floors and the like; and more particularly relates to anchor devices for such purposes which can be cast in the concrete prior to setting.

An object of the present invention is to provide an improved anchor device of the kind referred to and having means facilitating initial correct positioning and maintenance of positioning in placement and during setting and hardening of the concrete structure to which a timber structure is to be subsequently fastened.

Another object of the invention is to provide an improved anchor device with means to ensure a firm hold in the concrete structure on setting and in a manner accommodating relatively thin wall or narrow wall structures, or cavity fitting.

Other and more particular object and advantages of the invention will become apparent from the ensuing description .

According to this invention therefore, there is provided an anchor device of elongate form fabricated from sheet metal and having a first bifurcated end part arranged to be embedded in cast in-situ concrete and the bifurcations arranged in splayed relationship with each other, and a second integrally formed timber engaging opposite end part arranged to extend longitudinally from said first part and to project from said concrete, said second timber engaging part having at least one integrally formed spike projecting therefrom for initial engagement with a length of timber positioned at the desired location relative to "\ 221730 the concrete prior to placement of said concrete in liquid form or subsequent thereto, and prior to setting and hardening of the concrete for correct final positioning of said anchor device; said second timber engaging part being arranged for 5 subsequent bending over and securement to the said length of timber or a further length of timber defining part of framing to be permanently (or substantially permanently) secured to said concrete.

Some preferred aspects of the invention will now be 10 described by way of example and with reference to the accompanying drawings, in which:- FIGURE 1 is a perspective view of one preferred form of anchor device in accordance with the invention, as shaped for location in the concrete to formthe structure base or 15 foundation and prior to final shaping and timber fixing.

FIGURE 2 is a sectional and side view illustrating the anchor device located with the first bifurcated end part embedded in a concrete base or foundation,and with the second part shown in full in the first timber engaging position 20 and in broken outline in the final timber fixing position, FIGURE 3 is a view similar to figure 2 and illustrating the application of the anchor device to a concrete cavity block wall structure,infilled with concrete to secure the anchor device, FIGURE 4 is a view in the direction of arrows IV-IV of figure 2 FIGURE 5 is a sectional view on lines V-V of figure 2, FIGURE 6 is a sectional and side view illustrating 221730 an alternative application of the anchor device of figure 1 to a concrete floor slab.

The anchor device, generally indicated by the arrow 1 , is preferably formed from relatively thin but strong sheet 5 metal which is resistant to or treated against corrosion e.g. a galvanised sheet steel, cut into elongate strip form and defining a first bifurcated end part 2 having its two legs 2a,2b angled relative to each other and relative to the other end timber fixing part 3 for initial location in 10 the concrete base or foundation structure 4. Preferably the second anchor device part 3 is substantially flat in first forming, apart from at least one spike 5 formed integrally with and by stamping out of the sheet metal to project substantially normal to the plane of the second part 3 at 15 a position near the junction 6 between the two main end parts 2 and 3 of the anchor device.

The junction 6 (defined by a pre-formed bend line) may be at substantially the mid transverse part of the overall length of the device 1 ; and in the first principal uses accor-20 ding to figures 2 and 3 of the drawings the second part 3 of the device 1 is arranged to project vertically upwardly from the concrete structure 4, 4' at an edge location of a timber bottom plate 7 or like framing member, and the first leg parts 2a and 2b are angled inwardly and downwardly there-25 from for embedding in the concrete 4 below the timber plate or framing member 7. One leg part 2a may be angled between 40° and 50° (e.g. 45°) to the vertical and the other leg part 2b may be angled between 25° and 35° (e.g. 30°) to the 221730 vertical so that the splayed arrangement provides a secure anchor in the hardened concrete.

Preferably the first leg part 2a is shorter than the second leg part 2b so that it does not project too far from 5 the device timber fixing part 3 and is readily accommodatable in relatively narrow width concrete foundation walls placed in-situ (as illustrated in figure 2 or (and as shown in figure 3) within the cavity of a cavity concrete block 4' forming a foundation or other wall, the cavity in which the anchor 10 device 1 is located being infilled with concrete 4 after construction of the wall. In the latter construction formwork or boxing is not required and the anchor device 1 can be initially located and supported in the desired position with preliminary fixing to and support by a locating length of 15 timber or the finally employed timber plate or other framing member 7; but in the case of a fully placed in-situ concrete foundation or slab structure a series of the anchor devices 1 can be correctly aligned and positioned, and held in position during setting and hardening of the concrete by the empl-^ 20 oyment of an interim length of locating timber or formwork and temporary or initial engagement of the anchor devices 1 therewith by means of the projecting spikes 5 - from which the locating timber is readily detached after setting of the concrete 4. The timber plate or other framing member 25 7 to be secured to the concrete can then be readily positioned abutting the upwardly projecting part 3 and over the concrete 4 (a damp course employed between where required) and finally < \\(v secured by bending (hammering) the upper free end parts 3a ^'-•of the timber engaging part 3 over the positioned timber hHi 22173 0^ plate 7 and by hammering securing nails 8 through the part 3 and into the timber 7. The device part 3 can be provided with pre-formed nail holesSato facilitate fixing - or in an alternative arrangement (not illustrated) it is envisaged 5 that further integrally formed spikes can be provided on the part 3 for embedding in the timber 7 instead of separately provided nails 8.

/Another modification of the invention, and as seen in figures 1 and 4, envisages the bifurcation longitudinally fl/ of the timber engaging part 3 of the device 1 to enable bend- » s\\ouy»J^~ ing over and securement as aforesaid to the/ hopjaon bottom 1 plate or other framing member 7 of one leg part 3a and the securement without bending of the other leg part 3b to an upright (e.g. a stud) timber frame member 7' when occurring 15 at the anchor device 1 location (by design or otherwise). It will be appreciated that in some cases e.g. for a thicker bottom plate or when an anchor device 1 is located wholly at an upright, the timber engaging part 3 can remain vertical and not be bent over. w/20 The anchor devices 1 of this invention are preferably, for convenience of a user, preformed in the shape indicated with the bifurcated leg parts 2a and 2b angled relative to each other and the initially substantially flat timber engaging part 3; but it will be appreciated that for storage and/or 25 shipment it may be preferred to provide the anchor devices 1 in substantially flat form but with a preformed bend junction line 6 to facilitate subsequent angling as required and in accordance with fixing directions provided.

Referring now to figure 6 of the drawings, in some -fi- 221730 cases and to facilitate surface screening of such as a concrete slab floor it may be preferred not to have the anchor devices projecting upwardly during the concrete placement and screening process. Accordingly, the anchor devices 1 can be positioned adjacent and with the timber engaging part 3 initially horizontal and overlying the upper edge of outer timber formwork 9 for the concrete slab floor 4", the spike 5 being directed downwardly and engaged with said formwork 9. After setting and hardening of the concrete 4" the timber engaging part 3 can then be bent upwardly (and over - where required) adjacent the positioned timber plate or other framing member for securement as before - the projecting spike 5 being hammered flat.

Improved anchoring in the concrete 4,4' or 4", of the device 1 can be achieved by longitudinal fluting or channeling of the bifurcated leg parts 2a and 2b, as indicated particularly by way of example in figure 5 of the drawings.

Thus, by this invention there is provided a versatile and effective timber to concrete anchor device having advantages and uses not applicable to prior known concrete anchor devices; and being capable of manufacture and sale at low cost.

Some preferred aspects of the invention have been described by way of example and with reference to the accompanying drawings, but it will be appreciated that other variations of and modifications to the invention can take place without departing from the scope of the appended claims. 22(73C>

Claims (12)

WHAT WE CLAIM IS

1. An anchor device of elongate form fabricated from sheet metal comprising a first bifurcated end part wherein the bifurcations are arranged in use, in splayed relationship with each other; a second timber engaging end part formed integrally with, and extending longitudinally from, said first part; said second part being at least partly bifurcated; said second part including at least one integrally formed spike projecting therefrom; said spike or spikes provided below the bifurcation of said second part; said anchor device having a transverse preformed bend line between said spike and said first end part or having a transverse bend between said spike and said first end part, such that, in use, said first end is embedded in cast in-situ concrete, said second end is secured to timber framing thereby anchoring said timber framing to said cast in-situ concrete, and said spike is engaged with said timber framing or a timber formwork member to retain said anchor in a desired position while said cast in-situ concrete is poured and/or cures.

2. An anchor device as claimed in claim 1 wherein said second timber engaging part is arranged for, in use, bending over and securement to said timber framing.

3. An anchor device as claimed in claim 1 or claim Z wherein said first bifurcated end part has each of its bifurcations formed with longitudinal fluting or channelling.

4. An anchor device as claimed in any one of the preceding claims wherein one bifurcation of said first bifurcated end is substantially longer than the other.

5. An anchor device as claimed in any one of the preceding claims wherein, prior to subsequent bending of said second timber engaging part, one -8- Iz (7 bifurcation of said first bifurcated part is angled between 40° and 50° relative to said second timber engaging part, and said other bifurcation of the first bifurcated part is angled between 25° and 35° relative to said second timber engaging part.

6. An anchor device as claimed in any one of the preceding claims wherein said second timber engaging part is provided with a plurality of integral spikes arranged to engage and be embedded in said timber framing and/or said timber formwork member on bending and final securement of said second timber engaging part.

7. An anchor device as claimed in any one of claims 2 to 5 inclusive wherein said second timber engaging part is provided with a plurality of nail receiving apertures for securement after bending of said second timber engaging part to said timber framing.

8. An anchor device arranged and constructed substantially as hereinbefore described with reference to figures 1 and 5 of the accompany drawings.

9. An anchor device as claimed in claim 7 and adapted for use and fitment substantially as hereinbefore described with reference to figures 2 and 4 of the accompanying drawings.

10. An anchor device as claimed in claim 7 and adapted for use and fitment substantially as herein described with reference to figure 3 or figure 6 of the accompanying drawings. -9- 2 9 JAN 1992 JrJ l m)J

11. A method of securing timber framing to a concrete foundation employing an anchor device as claimed in any one of claims 1 to 8 inclusive, said method being substantially as hereinbefore described with reference to figures 2 and 4, or with reference to figure 3, of the accompanying drawings.

12. A method of securing the anchor device according to any one of claims 1 and 8 to timber boxing of a concrete foundation slab, and to timber framing relative to said slab, substantially as hereinbefore described with reference to figure 6 of the accompanying drawings.