Patent ES-8402051-A1 (ES)
Title: Slurry pump esp. for concrete
IPC: F04B19/04
Filed: 1983-02-02
Abstract: EP--85521 A The slurry pump, esp. for concrete, has a drive control (68) which includes a neutral position, with the drive inoperative. The pump guard (62) prevents access to a part of the pump until opened. A cam surface is operated by guard movement from its closed position to cause the control member to adopt its neutral position, if it is not already so positioned. - The cam retains the control in this setting until the guard is returned to its closed position. The guard has an arm (74) which slides so that the control lever (68) enters a slide channel when the guard is opened. (Dwg.5/8) EPAB- EP--85521 B The slurry pump, esp. for concrete, has a drive control (68) which includes a neutral position, with the drive inoperative. The pump guard (62) prevents access to a part of the pump until opened. A cam surface is operated by guard movement from its closed position to cause the control member to adopt its neutral position, if it is not already so positioned. - The cam retains the control in this setting until the guard is returned to its closed position. The guard has an arm (74) which slides so that the control lever (68) enters a slide channel when the guard is opened.  (19pp Dwg.No.5/8) - EP--85521 B A slurry pump comprising a hopper (1), a pumping cylinder (5) communicating with the hopper (1) through an opening (7) in a first wall (3) of the hopper (1), a pumping piston (9) receiprocatable within the cylinder (5), drive means (11) for the piston (9), a cranked delivery tube (17) having a first end portion (17a) mounted in an aperture (15) in a second wall (13) of the hopper (1) the aperture (15) having a central axis and the first end portion (17a) being pivotally mounted to swing about the central axis, means (25,29,21,19) for  swinging the delivery tube (17) to move a second end (17c) of the delivery tube (17) transversely into and out of register with the opening (7), a shaft coaxial with and pivotable about the central axis and extending through the first wall (3), and arm (19) fixed to the second end portion (17c) and to the shaft, and releasable clamping means (35,38,41) comprising an actuator (35) operable to apply a clamping force to the second end (17c) of the tube (17) to clamp the second end (17c) to the periphery of the openings (7) during transfer of slurry through the opening (7) and to release the clamping force while the tube (17) is swinging, characterised in that the actuator (35, Fig. 2) is located outside the hopper (1) and is arranged to act on the shaft to exert a force along the axis of the shaft.  (14pp)r USAB- US4569642 A The slurry pump has a hopper containing slurry. A pumping cylinder containing a piston communicates with the hopper through the hopper wall. A delivery tube is swung into and out of register with the cylinder. Slurry is drawn into the cylinder by the piston and out through the delivery tube. - The pump is controlled by a lever which has a central neutral position and two operating positions. Dangerous moving parts are covered by a guard mounted on hinges. An arm on the guard engages a slide which has a channel. If the guard is moved from its closed position, the arm slides the slide so that the control lever enters the channel and moves to its neutral position.