AU2005316202A1 - An adapter for a magnetic clamp - Google Patents

Description

WO 2006/063399 PCT/AU2005/001892 "An adapter for a magnetic clamp" Cross-Reference to Related Applications The present application claims priority from Australian Provisional Patent 5 2004907162 filed on 16 December 2004, the contents of which are incorporated herein by reference. Field of the invention The invention relates to clamping of elements during a manufacturing process. 10 The invention relates particularly, but not necessarily exclusively, to an adapter for a magnetic clamp. Background to the invention Manufacture of concrete slabs and structures is now commonly achieved by pre 15 casting techniques. Pre-cast manufacture of concrete slabs and structures is becoming the preferred method for many construction applications including industrial, commercial and retail applications. Typically, pre-casting is performed on a steel bed. Steel beds can be constructed to have a surface with a relatively high level of precision. This allows concrete slabs 20 and structures to be manufactured to an associated level of accuracy. Edge or perimeter moulds are used to produce concrete slabs and structures of a certain shape. These moulds are commonly referred to as sideforms. Securing the sideforms in position on a steel bed may involve the use of magnetic clamps. However, in practice the surface of a steel bed is not completely uniform. Variations in height at 25 certain regions of the bed may reach approximately 5mm. For steel beds which are recognised to be of a relatively high quality, variations of approximately 3mm between the high and low points are generally present. Such height variation can reduce the holding force a magnetic clamp exerts on a sideform, or cause the sideform to be supported in a position that is not perpendicular to the bed. 30 Summary of the invention According to a first aspect of the invention, there is provided an adapter for a magnetic clamp, the adapter including: a body having an element engaging portion for engaging an element to be 35 supported in position by the magnetic clamp; and WO 2006/063399 PCT/AU2005/001892 2 a height compensation mechanism carried by the body for compensating for height variations between the magnetic clamp and the element. The height compensation mechanism may include a resiliently flexible component. 5 The resiliently flexible component may define a bearing member which, in use, bears on a seat of the element. The resiliently flexible component may be integrally formed with the body as a one-piece unit. The resiliently flexible component may be an interrupted component comprising 10 a number of independent portions. The adapter may further include an urging means which acts on the resiliently flexible component to return the resiliently flexible component to a rest position. The urging means may be an elastomeric member. Instead, the urging means may be in the form of a spring such as a compression spring or a leaf spring. In another embodiment, 15 the urging means may be a threaded arrangement. The body may define mounting formations for releasably mounting the body to the clamp. Securing elements may co-operate with the mounting formations to secure the body to the clamp. According to a second aspect of the invention, there is provided an adapter for a 20 magnetic clamp, the adapter including: a body having an element engaging portion for engaging an element to be supported in position by the magnetic clamp; and a height compensation mechanism carried by the body for compensating for height variations of a work surface on which the magnetic clamp and the element rest. 25 Brief description of the drawings An embodiment of the invention is now described by way of example with reference to the accompanying diagrammatic drawings in which: Figure 1 shows a front view of an adapter, in accordance with an embodiment of 30 the invention, for a magnetic clamp, in a rest condition; Figure 2 shows a sectional side view of the adapter taken along line II-II in Figure 1; Figure 3 shows a front view of the adapter in a height compensating condition; Figure 4 shows a sectional side view of the adapter taken along line IV-IV in 35 Figure 3; WO 2006/063399 PCT/AU2005/001892 3 Figure 5 shows a schematic side view of the adapter, in use, attached to the magnetic clamp; and Figure 6 shows a schematic side view of the adapter, also in use. 5 Detailed description of the exemplary embodiment In the drawings, reference numeral 10 generally designates an exemplary embodiment of an adapter for a magnetic clamp 12 (Figures 5 and 6). The adapter 10 includes a body 14 having an element engaging portion 16 for engaging an element 18 to be supported in position by the magnetic clamp 12. The adapter 10 also includes a 10 height compensation mechanism 20 carried by the body 14 for compensating for height variations between the magnetic clamp 12 and the element 18. The body 14 is mountable to an end face 20 (Figure 5) of the clamp 12 by fasteners (not shown) positioned through mounting formations 22 (Figure 1). The adapter 10 is mounted to the clamp 12 such that a first face 24 of the adapter 10 is 15 substantially flush with an end face 26 of the clamp 12. In use, an opposed second face of the adapter 10 acts as a guide 28 which will be described in greater detail below. The height compensation mechanism 20 is carried by the body 14. The height compensation mechanism 20 includes the element engaging portion 16 in the form of a resiliently flexible component 30. The embodiment of the adapter 10 shown in the 20 drawings includes a height compensation mechanism 20 having three independent element engaging portions 16. Each element engaging portion 16 defines a bearing surface 32 for engaging a seat 34 (Figure 5) of the element 18 which is to be clamped in a desired position. The element 18 is in the form of a sideform 36. In use, the element engaging portions 16 act like a spring to compensate for height variations 25 between the clamp 12 and the sideform 40. In another embodiment, the height compensation mechanism 20 may be a threaded arrangement. The threaded arrangement may include a threaded member which bears against the resiliently flexible component 20. The threaded member may be arranged so that at least a portion of the threaded member is external to the body 14 to allow manual adjustment 30 of the height compensation mechanism 20. The adapter 10 also includes an urging means, in the form of a rubber insert 38, associated with, and acting on, each element engaging portion 16 to return the associated element engaging portions 16 to their rest positions as shown in Figures 1, 2 and 5. In another embodiment, the urging means may be a compression spring or a leaf 35 spring.

WO 2006/063399 PCT/AU2005/001892 4 In use, the adapter 10 is releasably secured to the clamp 12 as described above. The sideform 36 is placed on a work surface 40 (Figure 5). In one application, the work surface 40 is a surface of a steel bed (not shown) and the sideform 36 is used for moulding precast concrete slabs and structures. Once the sideforn 36 is in the required 5 orientation, the clamp 12 is positioned such that the guide 28 makes contact with regions 42 of an operatively rear surface 44 of the sideform 36. To position the clamp 12 in its operative position, the clamp 12 is slid in the plane of the guide 28 relative to the sideform 36 until the clamp 12 makes contact with the work surface 40. The magnetic force of the clamp 12 acts to hold the bearing surface 32 in the seat 34 of the 10 sideform 36 and holds the sideform 36 in the required orientation. Figure 5 shows the clamp 12 and the sideform 36 resting on a level work surface 40. In this case, the adapter 10 is not required to compensate for height variations. Figure 6 shows a situation where the work surface 40 is not level. In this case, the clamp 12 rests below the sideform 36 by an amount 'h'. To compensate for this 15 height difference 'h, the element engaging portions 16, in response to the reactive force acting on the bearing surface 32, is displaced relative to the body 14. Figures 3 and 4 also show the element engaging portions 16 in their displaced positions. The displacement of the element engaging portions 16 maintains the magnetic contact between the clamp 12 and the work surface 40. 20 After use, the clamp 12 is removed from the work surface 40 and the element engaging portions 16 return to their rest position. The return of the element engaging portion 16 to the rest position is aided by the elastic properties of the rubber insert 38. It is an advantage of at least a preferred embodiment of the adapter 10 to provide compensation for variations in height between the clamp 12 and the sideform 36. It is a 25 further advantage of the invention that by including a height compensation mechanism 20, the adapter 10 provides for more reliable and improved operation of the clamp 12. It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly 30 described. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.

Claims (9)

1. An adapter for a magnetic clamp, the adapter including: a body having an element engaging portion for engaging an element to be supported in position by the magnetic clamp; and 5 a height compensation mechanism carried by the body for compensating for height variations between the magnetic clamp and the element.

2. The adapter of claim 1 in which the height compensation mechanism includes a resiliently flexible component. 10

3. The adapter of claim 2 in which the resiliently flexible component defines a bearing member which, in use, bears on a seat of the element.

4. The adapter of claim 2 or claim 3 in which the resiliently flexible 15 component and the body are integrally formed as a one-piece unit.

5. The adapter of any one of claims 2 to 4 in which the resiliently flexible component is an interrupted component comprising a number of independent portions. 20

6. The adapter of any one of claims 2 to 5 which includes an urging means which acts on the resiliently flexible component to return the resiliently flexible component to a rest position.

7. The adapter of claim 6 in which the urging means is an elastomeric 25 member.

8. The adapter of any one of the preceding claims in which the body defines mounting formations for releasably mounting the body to the clamp. 30

9. An adapter for a magnetic clamp, the adapter including: a body having an element engaging portion for engaging an element to be supported in position by the magnetic clamp; and a height compensation mechanism carried by the body for, in use, compensating for height variations of a work surface on which the magnetic clamp and 35 the element rest.