Steel pump jack with safety latch and method
View Patent ↗An upper shackle assembly for a steel pump jack for a wood pole includes a u-shaped shackle component to receive the wood pole. The assembly includes a crank handle that extends through the shackle component and engages the pole to lower the pump jack down the pole. The assembly includes a brake attached to the shackle component to engage with the pole if the crank handle fails. A method for installing a steel pump jack to a wood pole includes the steps of placing a u-shaped shackle component about the wood pole. There is the step of closing a brake with the shackle component to engage with the pole if a crank handle fails. There is the step of extending the crank handle through the shackle component to engage the pole. A steel pump jack.
1. An upper shackle assembly for a steel pump jack for a wood pole comprising:
a u-shaped shackle component capable of receiving the wood pole;
a crank handle that extends through the shackle component and capable of engaging the pole to lower the pump jack down the pole; and
a brake attached to the shackle component capable of engaging with the pole if the crank handle fails, the brake includes a latch plate having a first side and a second side, the first side has a latch tab and the second side has a slot and a cover rib, the latch tab has a hole and the cover rib has a hole, the brake includes a pin which fits through the latch tab hole to hold the latch plate in place when the latch plate is closed with the u-shaped shackle component, the hole in the cover rib receives the end of the crank handle.
2. An assembly as described in claim 1 wherein the latch plate includes a rib capable of catching the wood pole if the crank handle fails.
3. An assembly as described in claim 2 wherein the shackle component includes a first side with an open slot through which the latch tab extends in a closed position, and a second side having an attachment surface from which a rivet extends through the slot of the latch tab so the latch plate can slide and pivot with respect to the attachment surface.
4. An assembly as described in claim 3 wherein the second side of the shackle component includes a square hole at least partially obstructed by the cover rib when the latch plate is not in the closed position and to ensure the latch plate is in the closed position during use.