Prop preloading apparatus
AssigneeHL&H Timber Products (Proprietary) Limited
InventorsFrans R. P. Pienaar, Brian P. Lewis, Graham Clark
Life of this patent
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Abstract
The prop preloading apparatus comprises a frame and means for supporting the frame on an end of an elongate prop in a manner permitting at least limited swivelling movement of the frame relative to the prop about at least one axis transverse to the axis of the prop. The apparatus also includes a flexible preload bag which is inflatable with a settable substance and which is dimensioned to be supported by the frame.
Claims11
A prop preloading apparatus comprising a frame, means for supporting the frame on an end of an elongate prop in a manner permitting at least limited swivelling movement of the frame relative to the prop about at least one axis transverse to the axis of the prop, and a flexible preload bag which is inflatable with a settable substance and which is dimensioned to be supported by the frame, wherein the frame includes a support member in the form of a tray for receiving and supporting the bag and wherein the apparatus includes a cover member which makes a telescopic fit with the tray and which, in combination with the support member, forms an enclosure for the bag.
A prop preloading unit comprising a frame of open construction and made up of elongate frame members, the frame including a strap for passing over the end of an elongate prop for supporting the frame on the end of the prop, and the frame being adapted to support a flexible preload bag which is inflatable with a settable substance, wherein the frame presents spaced apart limbs arranged to locate on opposite sides of the end of the prop and wherein the frame includes re-entrant restraining members fixed to opposite edges of the frame to embrace opposite edge regions of the inflatable bag thereby no restrain transverse movement of the bag relative to the frame.
The combination of:
- (a) a prop preloading unit comprising a frame of open construction and made up of elongate frame members, the frame including a strap for passing over the end of an elongate prop for supporting the frame on the end of the prop, and the frame being adapted to support a flexible preload bag which is inflatable with a settable substance wherein the frame presents spaced apart limbs arranged to locate on opposite sides of the end of the prop, and wherein the frame includes re-entrant restraining members fixed to opposite edges of the frame to embrace opposite edge regions of the inflatable bag thereby to restrain transverse movement of the bag relative to the frame;
- and
- (b) an inflatable preload bag dimensioned to be supported by the frame and adapted to be inflated by settable grout under pressure.
Dependencies are inferred from the claim text.