Pumps

Claim 2

A pump comprising a hollow housing having rigid walls to be immersed in a liquid to be sucked therein, said walls of said housing bearing an intake valve and a delivery valve connected to a delivery tube, said housing containing a resiliently deformable chamber connected through a said wall of said housing to an end of a control tube full of liquid in the operative position and having its other end connected to a control cylinder in which an actuating piston is slidably movable, between a position of maximum volume of a part of the cylinder connected to the resilient chamber and a position of minimum volume of said part of the cylinder, wherein the delivery tube and the control tube are connected to each other in the vicinity of the housing by a priming conduit including a check valve for allowing the liquid to flow only from the delivery tube downstream of said delivery valve to the control tube, whereby the head of liquid in the delivery tube passes to the control tube to replace air in the deformable chamber and the control tube and the control cylinder.

Claim 3

A pump according to claim 1, in which the housing essentially comprises an elongate hollow cylindrical member adapted to fit into a drill hole terminating in a sheet of water, wherein the resiliently deformable chamber comprises a resilient sleeve of rubberlike material coaxial with the cylindrical member, and comprising transverse reinforcement means comprising at least one layer of helically wound wire coaxial with the resilient sleeve, said sleeve comprising two end caps, one of which is detachably fixed to the upper end wall of the cylindrical member in the service position, by means of an axial tubular connection communicating with the control tube through said upper end wall.

Claim 4

A pump according to claim 2, wherein said upper end wall of the cylindrical member comprises a casing containing the delivery valve, the priming conduit connecting the delivery tube to the control tube, and the check valve of said priming conduit.

Claim 5

A pump according to claim 1, wherein the control cylinder is arranged vertically in the service position and mounted on a bed plate having attachment means to be fixed at the head of the drill hole, so as to accommodate the control cylinder, at least partly, in the top of said hole beneath said plate.

Claim 6

A pump according to claim 1, the resiliently deformable chamber comprising a resilient sleeve of rubber-like material coaxial with the cylindrical housing and mounted therein with radial clearance, said sleeve comprising transverse reinforcement means comprising at least one layer of helically wound wire coaxial with the resilient sleeve, said sleeve being thick enough to withstand the hydrostatic pressure of the control tube and the delivery tube in a resilient stage of partial extension of the sleeve in the axial direction, the arrangement of the sleeve in the housing permitting a further axial extension of the sleeve under an additional pressure provided by the actuating piston moving toward said position of minimum volume, and the resilient strength of the sleeve allowing the sleeve to return to said partial extension when the actuating piston is released, said piston being thereby brought back towards said position of maximum volume by the resilient strength of the sleeve.

Claim 7

A pump comprising a hollow housing having rigid walls to be immersed in a liquid to be sucked therein, said walls of said housing bearing an intake valve and a delivery valve connected to a delivery tube, said housing containing a resilienty deformable chamber connected through a said wall of said housing to an end of a control tube full of liquid in the operative position and having its other end connected to a control cylinder in which an actuating piston is slidably movable, between a position of maximum volume of a part of the cylinder connected to the resilient chamber and a position of minimum volume of said part of the cylinder, wherein the delivery tube and the control tube are connected to each other in the vicinity of the housing by a priming conduit including a check valve for allowing the liquid to flow only from the delivery tube to the control tube, there being a bleeding aperture on a side wall and near an upper end of said cylinder in the service position, the actuating piston having a bleeding channel arranged to communicate on one side with the control tube, and on the other side with the bleeding aperture of the cylinder wall near said position of the piston corresponding to the maximum volume of the cylinder, in order to let air escape from the resilient chamber and from the control tube.

Claim 8

A pump comprising a hollow housing having rigid walls to be immersed in a liquid to be sucked therein, said walls of said housing bearing an intake valve and a delivery valve connected to a delivery tube, said housing containing a resilienty deformable chamber connected through a said wall of said housing to an end of a control tube full of liquid in the operative position and having its other end connected to a control cylinder in which an actuating piston is slidably movable, between a position of maximum volume of a part of the cylinder connected to the resilient chamber and a position of minimum volume of said part of the cylinder, wherein the delivery tube and the control tube are connected to each other in the vicinity of the housing by a priming conduit including a check valve for allowing the liquid to flow only from the delivery tube to the control tube, there being a bleeding aperture on a side wall and near an upper end of said cylinder in the service position, the actuating piston having a bleeding channel arranged to communicate on one side with the control tube, and on the other side with the bleeding aperture of the cylinder wall near said position of the piston corresponding to the maximum volume of the cylinder, in order to let air escape from the resilient chamber and from the control tube.