US2318494A - Surface rod line jack - Google Patents

Description

y 1943' w. J. JONES 2,318,494

SURFACE ROD LINE JACK Filed Feb. 15, 1942 Patented May 4, 1943 VIUNITED STATES Pram OFFICE paratus and particularly to an improved surface rod line jack for providing a connection between the power source and the pumping mechanism.

. ;An object of the invention is to provide a rod.

line jack'which is safe and easy to operate and which at the same time is of relatively simple, yet rugged construction.

Another object is to provide a rod line jack which may be made in part of stock material readily available in the field.

A further object is to provide a rod line jack embodying a minimum number of parts which may be easily assembled and disassembled.

Other objects and advantages ofthe invention will become apparent in view' of the following description taken inconjunction with the drawing, wherein:

g Fig. l is a view in section and elevation of the rod. line jack in accordance with the invention; and v Fig. 2 is a plan view thereof. Referring to the drawing in detail, the improved surface rod line jack comprises a draw bar l formed with a series of ratchet teeth H operatively mounted. The bar I0 is preferably rectangular in cross-section and freely engages a longitudinal rectangular opening in the head {3, to assure the alignment of the bar H) in operation. The lower end of latch .15 is formed with ajpawllfi and the upper end of the latch is 5 preferably of substantial length and provided with an enlargement defining a weight I5". The latch is rotatably mounted on a bearing bolt H3 which is projected through the latch head and remcvably secured in place as by means of a cotter key 15. To limit the rearward movement of the latch l5. a'stop l! is projected through the rear extremity of the latch head and also provides a rest for the latch l5 when the latter is in idle position. A look member in the form of a key bolt ll" is slidably projected through the upper portion of the latch head 13 and serves to lock the latch when desired.

The power end of the coupling tube or pipe 52 ispivotally connected to a member I B mounted on a driving eccentric or l9 actuated from the main power source. The tube or pipe l2 may be of any length necessary and is shown provided with a coupling member 2% for connecting adjacent. ends-of pipe sections.

.wells in the area.

The coupling tube I2 is supported by a post 2| having on upper end thereof a slide bearing 22. The draw bar H) projects through the upper extremity of a supporting post 23, and'removably secured to this latter post is a stationary latch block or head 24 having mounted therein a stationary latch 25 provided'at its lower end with a pawl 25' and at its upper end with a weight 25". The latch 25 is pivotally mounted on a removable pivot or bearing bolt 26 which may be removably held in place by a cotter key 26' or the like. A look bolt 21 is slidably mounted in one side of the head 24 and may be used to lock the latch 25 back out of operative position when desired. Like the latch l5, the handle portion of latch 25 projects well upwardly for easy access without danger of the hands or fingers be;- coming engaged by pawl 25'. 1

The extreme outer end of the draw bar-is shown connected to a rod line 28 by means ofa clamp 29, the rod line being connected to pumpactuating mechanism generally indicated at 30 and which may be of any suitable type.

In operation, the draw bar ,IU travels with the coupling pipe l2 during the normal stroke. When the well is hung up for any particular reason,

the couplingpipe l2, latch head 13 and latch travel over the draw banassuming the power source is still in operation and pumping other Whenit, is desired :to take up slack in, the rod line connections, both the stationary latch and traveling latch l5 are engaged with the teeth of the draw bar ID, the latch l5 sliding over the ratchet teethof the draw bar on the return stroke of the tube 12 and engaging said teeth on the pull stroke, while the stationary latch preventsreturn-movement of the draw bar. If for some reason the slack is tobe let out, or the connections are tobe lengthened, the stationary latch is disengaged until the stroke is almost out, whereupon the stationary latch isengaged and the traveling latch released until almost the limit of the pull stroke is reached, whereupon it is engaged and the sta ticnary latch disengaged, and this process repeated until the tension is relieved from the rod line, whereupon both latches are disengaged and the draw bar is-free andcan'be pulled out as blevformanipulation, while the lower or pawl extremities. thereof are completely shielded against accidental. contact with the .fingers' or hands of an operator. Also the coupling pipe l2 completely shields the draw bar from the traveling latch rearwardly to the power connection. These are important features from a safety standpoint, since accidents ofttimes result in manipulatingisurface rod line jacks where the parts are exposed.

Simplicity of construction is another important factoras is also ease in operation. In this respect the one-piece latches l5 and25-play an important part. The power coupling l2,maybe made from stock available in the field and thus may be readily lengthened, repaired or replaced.

It will be understood that minor changes in construction and design may be made in my improved rod line jack without departing fromthe vspirit or scope of the invention as defined by .the appended claims.

What-is claimed is:

'1. in a surfacerod line jack, a draw'ba-r pro.- .vided with ,a series of ratchet teeth alonga surfacethereof, the .outer. endof said draw 'barbeing adapted :for connection with .a rod line-and the inner .extremity of said bar projectim free, an

elongated 'tubularcoupling member connecting the draw "bar to a power :source, said tubular .coupling member enclosing a substantial portion of :the drawbar and having .a hollow latch head mountedon theinner end thereof, a trav.- .eling latch pivotallyqmounted in said latch head and provided with a :pawl adapted for engagement with the teeth .of'the draw bar when the coupling member is .given a power stroke, a support for the rod "line, another latch head ,secured to said support, a stationary latchpivotallymounted insaid'latter latch head and provided with a pawladapted to cooperate with said traveling latch under certain operating conditions, said latch heads having upwardly projecting portions shielding said pawls and adjacent lower portions of the latches.

-2. Ina surface rod line jack, .a draw bar provided with a series of ratchet teeth along a surface thereof, the outer end of said draw bar be- :ing connected to a rod line and the inner ex- :tremity of said bar projecting free, an elongated coupling tube telescoped over the free .extremity of the draw bar, a hollow latch head connected to the inner endof the tube and having upwardly projecting side portions providing a housing opening of material depth, a traveling latch having a pawl formed on its lower end disposed in said opening and pivotally connected to said latch head, said pawl being adapted to engage said teeth when a power stroke is applied to said coupling member, the pawl and lower portion of the 'latch being completely shielded by said latch head, an upright support through which said draw bar has movement, a latch head secured to said support and also having upwardly projecting housing portions on opposite sides of said .draw bar, and a stationary latch having a pawl formed ,on its lower end adapted to engage the teeth of the draw bar to cooperate with said traveling'latch under certain operating conditions, the pawl and adjacent lower portion of the stationary latch being also shielded by the said housing portions.

3. Ina surface rod line jack, a draw bar provided with a series .of ratchet teeth along a surface thereof, the outer. end .of said drawbar being connected to a rod line and the inner extremity of the draw bar projecting free, a coupling member telescoped .over the free extremity of said draw bar, the outer .end .of said coupling member being connected to a power source, a latch head connected to the inner end of said coupling member and having upwardly projecting housing portions on opposite sides of the draw bar, a traveling latch 'pivotally mounted in said latch head and having a pawl on its lower end adapted to engage the teeth of the draw bar when a power stroke is applied to the coupling member, said pawl and latch being of rigid construction and having a handle portion projecting upwardly a material distance over the latch head, means for limiting the throw-out movement of said latch, and a lock member mounted in one of the upwardly projecting side portions of said latch head and adapted to engage and hold the latch in throw-out position.

--4. 'In a surface rod line -jack, -a draw bar providedwith a series of ratchet teeth along a surface thereof, the outer end of said draw bar being connected to a rod line and the inner extremity of said .draw bar projecting free, a coupling member telescoped over-the free extremity of the draw bar and a latch'headconnected to the inner end of said coupling member, upright supports one through which said draw bar has movement and another providing a slidable bearing for saidcoupling member, a stationary latch head secured to said first-named support, both of said latch heads being provided with housing portions which project upwardly on opposite sides of the draw bar, a rigid one-piece trave'ling latch mounted in said first-named latch head and a similar latch mounted in said secondnamed latch head, each of said latches being provided with a-pawl at its lower end adapted to engage the teeth of the draw bar under certain operating conditions, a stop for each of said latches for limiting the throw-out movement thereof, and lock pins slidably mounted in said housing portions and adapted to be projected into the path of the movement of the latches and lock the same in throw-out position.

5. In a surface rod line jack, a draw bar provided with a series of ratchet teeth along the top surface thereof, the outer end of said draw bar being connected to a rod line and the inner extremity of said draw bar projectingfree, a hollow coupling member slidably telescoped over the free extremity of the draw bar, a latch head connected to the inner end of said coupling member, a pair of upright supports, one having an opening through which said draw bar has movement and the other of which provides a slidable bearing for said coupling member, a ,stationaryjlatch head secured to said first-named support in subtan a l hor zo ta a ignment with said openn bo h o said latch heads being r de t housing portions which project upwardly on 'opposite sides of said draw bar, a rigid one-piece traveling latch mounted in said first-named latch head and a similar latch mounted in said second-named latch head,,each of said latches being provided with a pawl at its lower end adapted to engage the teeth of the draw bar under certain operating conditions and a counter weighted handle portion projecting upwardly beyond the housing provided by its coacting latch head, a stop for each of said latches for limiting the throw-out movement thereof, and lock pins slidably mounted in said housing portions and adapted to be projected into the path of movement of th latches and lock the samein throwout position.

WILLIAM J. JONES.

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