Abstract: A compact syringe comprises a cylindrical barrel, a stopper movable within the barrel and a detachable clip-on plunger. The plunger has a resilient c-shaped shaft for clipping onto the barrel's exterior when the syringe is not in use. When in use, the plunger is removed from the barrel and its c-shaped shaft is compressed slightly and then inserted into the rear end of the barrel to apply movement force to the stopper. The clip-on plunger reduces the amount of storage space required by the compact syringe. Reducing syringe storage space is of particular importance for disposable, single-use syringes.

Abstract: A compact syringe comprises a cylindrical barrel, a stopper movable within the barrel and a detachable clip-on plunger. The plunger has a resilient c-shaped shaft for clipping onto the barrel's exterior when the syringe is not in use. When in use, the plunger is removed from the barrel and its c-shaped shaft is compressed slightly and then inserted into the rear end of the barrel to apply movement force to the stopper. The clip-on plunger reduces the amount of storage space required by the compact syringe. Reducing syringe storage space is of particular importance for disposable, single-use syringes.

Abstract: A filter having filter elements with outwardly flanged ends sealed together. The seal may be secured by use of a rod extending in a lengthwise direction through apertures in the flanged ends. The rod has one end releasably securing the filter element and a second end secured to the housing. A frame can cover the filter elements, and a jack screw in the frame can be used to apply force to the filter elements to secure the seals. The filter may have a cleaning apparatus capable of suctioning material from the filter element.

Abstract: Apparatus for use in testing the mechanical behaviour and deformation characteristics of rocks and the like at various locations in a borehole comprises a pressure intensifier used in conjunction with a dilatometer head, the two being rigidly interconnected so as to be lowered into the borehole. The pressure intensifier comprises a cylindrical housing providing upper and lower cylinders, and a double action piston which provides a 6 to 1 differential between the input pressure side and the output pressure side. Pressure changes are measured by means of a pressure transducer, and volumetric changes are determined from measurements of the linear displacement of the piston. Such linear displacements are measured by means of a shaft encoder coupled to a motion translating device for translating linear displacement into rotary displacement.

Abstract: A highly portable pressure intensifier for use with a borehole dilatometer head having an expandable body defining an internal cavity to measure deformation properties of in-situ rock masses. The housing of the intensifier comprises two axially aligned interconnecting cylinders, one of which is of substantially larger diameter. The larger cylinder has a reciprocating piston mounted therein, the piston having a plunger portion which extends axially into the smaller cylinder. The smaller cylinder is connected to the cavity of the dilatometer head by means of high pressure tubing. The larger cylinder is filled ahead of the piston with a first working liquid. The second cylinder, the dilatometer head cavity and the interconnecting tubing are filled with a second working liquid.

Abstract: A hydraulic rock breaking tool of modular construction comprises an assembly of shaft sections having a longitudinally extending bore therethrough and lateral passages communicating with the bore. The shaft assembly provides a number of radial abutment flanges between which a number of self-supporting, radially expansible, elastomeric membranes are confined in the longitudinal direction, each membrane having a cylindrical portion surrounding the shaft and defining with it an annular space communicating with the bore via the lateral passages. Each membrane has a pair of annular end flanges, each terminating in an axially extending retrorse flange which is seated against the shaft section for sealing engagement with it, the retrorse flanges being urged against the shaft by fluid pressure in the annular space.