Remote reset

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT: Referring to the drawings and particularly FIG.
1, there may be seen schematically represented a pump jack 10.
A typical pump jack will have samson post 12 attached to a base.
Walking beam 14 is fitted to the samson post having a horsehead at one end which is attached by means of a bridle to sucker rod 16.
A connecting rod and crank mechanism is on the other end of the walking beam 14.
A motor such as electric motor 18 is also mounted on the base to drive the crank.
Vibration switch 20 is mounted upon the walking beam.
As stated above, it is desirable that the vibration switch 20 be mounted where it is susceptible to vibrations particularly those of downhole vibrations and transmitted up through the sucker rod 16.
In fact, it might be desirable to locate it even closer to the horsehead than illustrated in the drawing.
The vibration switch 20 (FIG.
2) has housing 22 with simple clamp 24 on the housing so that the housing may be securely attached to supporting structure, in this case the walking beam 14.
Electrical conductors 26 enter the housing.
The housing contains vibration elements for changing the resistance between the electrical conductors responsive to vibrations.
The electrical conductors which thereby detect the vibration connected by circuits, not shown for simplicity, to the electric motor 18 to shut down the motor and thus the well in the event the vibrations are strong enough to activate the vibration switch.
When this occurs, the vibration switch can be reset by reset button 28.
Also an adjustment screw 30 is contained upon the housing 22 of the switch 20 so that the severity of vibrations necessary to activate the switch may be adjusted.
Those having ordinary skill in the art will understand that the description of the elements to this point are all well-known and commercially on the market.
As stated before, vibration switches as described are disclosed in U.
S.
Pat.
No.
3,641,290.
To the mechanisms described I attach a remote reset