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A pump-off control system for use with an electric motor driven pump jack assembly for operation of a down hole pump in which a circuit interrupter device is attached to the top of the polished rod of the pump jack and upon occurrence of fluid pound, the polished rod imparts sufficient force on the

A pump-off control system for use with an electric motor driven pump jack assembly for operation of a down hole pump in which a circuit interrupter device is attached to the top of the polished rod of the pump jack and upon occurrence of fluid pound, the polished rod imparts sufficient force on the circuit interrupter device to open the electrical contacts of the device momentarily interrupting power to the electric motor shutting down the pump for a period of time determined by a time delay relay that controls the shut down time for the well.

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A pump-off control system for use with an electric motor driven pump jack assembly for operation of a down hole pump in which a circuit interrupter device is attached to the top of the polished rod of the pump jack and upon occurrence of fluid pound, the polished rod imparts sufficient force on the

A pump-off control system for use with an electric motor driven pump jack assembly for operation of a down hole pump in which a circuit interrupter device is attached to the top of the polished rod of the pump jack and upon occurrence of fluid pound, the polished rod imparts sufficient force on the circuit interrupter device to open the electrical contacts of the device momentarily interrupting power to the electric motor shutting down the pump for a period of time determined by a time delay relay that controls the shut down time for the well. movement of the handling unit; and a handle frame connectable to the mounting structure and configured to allow an operator to actuate at least one of the keys with a thumb, wherein the handle frame includes at least one cross member having opposite axial ends, a pair of elongate grip elements, one of the grip elements extending transversely to the cross member and having one end detachably connected to one of the axial ends, and the other of the grip elements extending transversely to the cross member and having one end detachably connected to the other one of the axial ends, and fastening means for releasably attaching the handle frame to the mounting structure, wherein the fastening means includes a fastener configured to allow displacement of the cross member and thereby effect a positional adjustment of the grip elements with respect to the keys, before securely fixing the cross member to the mounting structure. 17. The device of claim 16, wherein the fastener has a tubular configuration with a horizontal cylindrical through-opening for passage and axial displacement of the cross member. 18. A modular construction kit for making a device for manually maneuvering a handling unit, comprising: at least one mounting structure supporting a control mechanism for activating a movement of the handling unit; a plurality of cross members of varying configuration; a plurality of elongate grip elements of varying configuration; a plurality of connectors of varying configuration for connecting a one of the cross members with two of the grip elements to thereby construct a handle frame of desired configuration; and a plurality of fasteners for allowing releasable attachment of a selected one of the cross members to the mounting structure, wherein each of the fasteners is configured to allow displacement of the selected cross member and thereby effect a positional adjustment of the grip elements with respect to the keys, before securely fixing the cross member to the mounting structure.