GB2476973A

GB2476973A - Drive recess

Info

Publication number: GB2476973A
Application number: GB201000712A
Authority: GB
Inventors: Michael Wilkinson
Original assignee: TITE RANGE DEVELOPMENTS Ltd
Current assignee: TITE RANGE DEVELOPMENTS Ltd
Priority date: 2010-01-18
Filing date: 2010-01-18
Publication date: 2011-07-20
Anticipated expiration: 2030-01-18
Also published as: GB201000712D0; GB2476973B

Abstract

A drive recess for a fixing to has four drive wings (1) axially aligned with the shank of a fixing, each drive wing (1) having a insertion drive face (2) axis in line with the centre of the recess (10), at an angle to a centre line of the wing. Opposing removal drive faces (3) on each drive wing (1) are parallel to the centre line of the wing allowing the fastener to be removed by a standard cruciform drive tool.

Description

Drive Recess The invention relates to a drive recess, of a kind intended primarily for use with fasteners and fixings, which has features that reduce the occurrence of drive tool slippage, and is able to be removed by a standard cruciform drive tool, hereinafter referred to as the drive recess.

BACKGROUND TO THE INVENTION

There are many existing methods for driving a fixing or fastener into wood or other materials where a recess is formed in the head of the fixing or fastener for which a drive tool is inserted into that recess and turned to drive the fixing or fastener into the wood or other material. The cruciform type recess is one such method of driving a fastener or fixing, the Pozi Drive recess being the most ubiquitous in the UK. The conventional cruciform drive recess tends to load the drive torque at the extremities of the drive face situated on the wings of the recess which often results in the drive tool slipping from the fastener or fixing recess, this is known as cammout; the higher the drive torque, due to the hardness of the material the fixing or fastener is fixed into, the more cammout occurs.

This cammout is exacerbated by the tendency of the operator to inadvertently angle the drive tool whilst driving the fastener or fixing into timber or any other such material. The popularity of the conventional cruciform drive recess means that it is difficult to introduce a new more efficient drive recess, unless that recess is capable of accepting a conventional cruciform drive tool to drive the fixing or fastener out of any fixed material.

DESCRIPTION OF THE INVENTION

An objective of the invention is to provide a recess that delivers an insertion drive torque axially by aligning the insertion drive face, situated on each wing of the recess, to the centre of the recess and not offset to the centre of the recess as in a conventional cruciform recess, thereby applying the drive torque more evenly along the drive face and not at the extremities, reducing the tendency for the drive tool to cammout of the drive recess.

In accordance with the objective, the extraction drive face in the recess is offset to the centre line of the recess just as a conventional cruciform recess, allowing the fastener or fixing to be driven out by a conventional cruciform drive tool.

An inner section of the insertion drive face, situated on each wing, is offset from the centre line of the recess and parallel to the opposing extraction drive face of the wing, aiding the engagement of a conventional cruciform drive tool into the recess of the fastener or fixing and its stability once engaged.

The drive recess is characterised in that it has a further square recess at the lower portion of the recess that is aligned at right angles to the driving wings, serving to eliminate the tendency for the operator to drive the fastener or fixing at an angle, thus further reducing the tendency of the drive tool to cam out.

The fastener recess can be utilised in all types of heads used on fasteners and fixings, such as: countersunk head, round head, pan head, raised head and hex head, manufactured in materials such as carbon steel, stainless steel and brass.

A preferred embodiment of the invention will now be described with reference to the accompanying drawings in which: FIGURE 1 shows the plan view of a recess embodying the invention HGURE 2 shows the elevation view of a recess embodying the invention.

FIGURE 3 shows the plan view of a conventional cruciform recess FIGURE 4 shows the elevation view of a conventional cruciform recess FIGURE 5 shows the plan view of the wing section of the recess of the invention FIGURE 6 shows the plan view of the wing section of the recess of the invention highlighting a section showing the plan view of the driver tool wing of a conventional cruciform driver tool when inserted into the recess of the invention.

FIGURE 7 shows the plan view of the driver tool used to drive the recess of the invention.

FIIGUER 8 shows elevation view of the driver tool used to drive the recess of the invention.

FIGURE 9 shows the plan view of a conventional cruciform driver tool FIGURE 10 shows the elevation view of a conventional cruciform driver tool.

The drive recess of the invention as shown in Figure 1 has four drive wings (1) where the drive face (2) of each wing delivers an insertion drive torque axially by aligning the drive face (2) to the centre of the recess (10), and not parallel and offset to the centre of the recess as in a conventional cruciform recess wing, Figure 3 (16), drive face, Figure 3 (9), thereby applying the drive torque more evenly along the drive face and not at the extremity of the drive face, Figure 3 (17), therefore lessening the likelihood of cam out of the drive tool, Figure 8 (12).

The drive recess of the invention as shown by the wing section (1) in Figure 5 has a drive face (2) that has an angle (6) of no less than 12 degrees and no more than 15 degrees to the centre line of the recess of the invention, Figure 1 (10), thus maximising the possible drive torque in consideration to the commercial practicalities of mass manufacture of the drive recess and its corresponding drive tool, Figure 8 (12).

As shown in Figure 6 the wing of the recess of the invention (1) has an extraction drive face (3) offset and parallel to the centre line allowing the wing (7) of a conventional cruciform drive tool, Figure 10 (15), to drive out the fixing or fastener.

As shown in Figure 6 the wing (1) of the recess of the invention has a portion of the drive face (4) offset to the centre line of the recess and parallel to the extraction drive face (3) aiding the wing, Figure 10(7) of a standard cruciform drive tool, Figure 10 (15) to engage in the recess and provide stability for driving the fastener or fixing out.

As shown in Figure 1 the recess of the invention has a square recess (5) at the lower part of the recess at a ninety degree angle to the wings (1) that allows the drive tool's corresponding square recess, as shown in Figure 8 (14), to engage, thus maximising the alignment of the drive tool in the drive recess minimising the tendency of the drive tool camming out.

Claims

Claims 1. A drive recess for fasteners and fixings having four drive wings axially aligned with the shank of a fixing, having their insertion drive face axis in line with the centre of the recess, at an angle to the centre line of the wing, allowing an axial drive, inhibiting cammout, the opposing removal drive faces on each wing are offset and parallel to the centre line of the wing allowing the fastener to be removed by a conventional cruciform drive tool, a part of the inner extremity of the insertion drive face of each wing lies parallel to its opposing extraction drive face to aid the engagement and stability once engaged of a standard cruciform drive tool, while the lower portion of the recess has a central square recess, further inhibiting cammout.
2. A drive recess in accordance to claim 1, where the angle of the insertion drive face applies the insertion drive torque evenly along the drive face and not at the extremities of the drive face, reducing the possibility of cammout.
3. A drive recess in accordance to claim 1, where the angle of the drive face is such to maximise the drive torque in consideration to the commercial practicalities of mass manufacture of both the drive recess and its corresponding drive tool
4. A drive recess in accordance to claim 1, where the lower central square recess is angled at ninety degrees to the wings of the recess.
5. A drive recess in accordance to claim 4, where the lower central square recess maintains the alignment of the drive tool with the recess while driving.