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Spray pump with a motor driven drive rod

  • US 4,799,866 A
  • Filed: 05/27/1986
  • Issued: 01/24/1989
  • Est. Priority Date: 08/03/1984
  • Status: Expired due to Term
First Claim
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1. An improved spray pump for metered delivery of a liquid from a spray cylinder by means of a spray piston, the spray pump having a housing, means for mounting the spray cylinder in the housing, a motor drive in driving connection with a threaded shaft mounted within the housing, and a gear unit for transmitting drive force from the threaded shaft to the spray piston, the gear unit having an axially movable drive rod extending through the wall of the housing, one end of the drive rod being engageable with the spray piston outside of the housing, the improvement comprising:

  • a translationally movable coupling arranged in a bearing block to connect the drive rod to the threaded shaft, the coupling having a coupling pin provided with a threaded section, the coupling pin being displaceably mounted on the bearing block and having a U-shaped recess extending transversely to the longitudinal axis of the coupling pin with the threaded section disposed on the side wall of the recess to engage the threaded shaft;

    the drive rod being pivotably mounted around its longitudinal axis in the housing for actuating the coupling, the drive rod being at a distance from and parallel to the threaded shaft;

    a control element fixed to the drive rod and located between the drive rod and the coupling pin, the control element having a cam which engages the coupling pin and which is disposed eccentric to the axis of rotation of the control element; and

    a torsional locking rod being arranged parallel to and at a distance from the threaded shaft and the drive rod, the bearing block engaging and being movable along the torsional locking rod in a direction parallel to the longitudinal axis of the torsional looking rod.

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