US 1629022 A
Description (OCR text may contain errors)
May 17, 1927.
H. A. DAVIS ET AL CEMENTING HEAD Filed April 22, 1924 7///l//J/////4 17 /v i 2 I CLEO FD v/s Patented May 17, 1927.
" UNITED STATES 1,629,022 PATENT OFFICE.
HERBERT A. DAVIS AND CLEO 'F. DAVIS, OF TORRANGE, CALIFORNIA.
Our invention relates to cementing heads used 1n cementing off 011 wells, and a purpose of our invention is the provision of a cementing head of simple and durable con-- struction, having locking means by which We will describe only one form of ce-.
I menting head embodying our invention, and
will then point out the novel features there of in claims.
In the accompanying drawings Figure 1 is a view showing in side elevation, and partly in section, one form of cementin head embodying our invention in applied; position with. respect to a well casing;
Figure 2 is a view similar to Figure 1, but taken at right angles to the latter;
Figure 3 is a transverse sectional view taken on the line 3-3 of Figure 1.
Referring specifically to the drawings, in
which similar reference characters refer to similar partsin all the ,views, our inventionin its present embodiment comprises a cementing head including a body 15 provided at its upper side with a transverse projection 16 formed with a longitudinally extending passageway 18 which communicates with a chamber 19 formed in the projection and body and the apex at a frusto-conical chamber 20 formed in the body 15. The
under side of the body 15 is rovided with an annular groove 21 of such iameter as to receive a conventional couplin collar 22 of a well casing section 23, an within the groove 21 is a compressible gasket 24 formed of rubber or other suitable material and provided for the purpose of forming a fluidtight joint between the headbody and the coupling collar.
The passageway 18 is adapted to have communication with pipes 25 and 26, the pipe 25 being connected to a source of liquid cement supply, and the pipe 26 connected to a source of water supply, whereby either cement or water can be delivered to the well casing through the chambers 19 and 20.
At diametrically opposed points upon the periphery of the body 15 enlargements 27 are formed and provided with vertical slots 28, through which extend rods 29 for snap Application filed April22, 1924. Serial No. 708,129,
porting lockin members 30 in depending relation to the ody 15 and for engagement with the lower edge of the collar 22 to secure the head as a unit upon the well casing. The lower ends of the rods '29 are formed with heads. 31 which serve to confine the members 30 upon the rods and to permit movement of the members by manipulating the rods through handles 32 formed on the upper ends of the rods. These members 30 are, in the present instance, of substantially semi-circular form,- and they co-operate to provide a locking ring adapted to embrace the casing section 23 at a point below the colbars 33 outwardly the projections 36 will I,
disengage the keeper lugs 35 to permit separation of the members 30..
For the purpose of forcing the head 15 downwardly upon the connecting collar so as to compress the'gasket 24, the rods 29 are formed with slots 29 through which extend wedge keys 37 each having-one'of its ends beveled, as indicated at 38, while its oppo site end is formed with aprojection 39 to limit the movement of the plates in one direction through the slots 29. I
It is to 'be particularly noted that the slots 28. gradually increase in width from their upper ends to their lower ends for the purpose of allowing lateral movement of the rods within the head to permit of a corresponding movement of the locking members 30 so that they can be shifted from the locking position shown in solid lines in Figure 1 tothe released position shown in dash lines.
In practice, the head 15 is arranged upon the connecting collar 22 in the manner shown in Figure 1, and with the locking members 30 in the dash line position, it will be clear that they can be moved inwardly to engage the lower edge of the connecting collar. As they are moved to this position the projections 36 of the latch bars 33 engage the keeper lugs 35 to retain the two locking members in ring formation. By driving the wedge keys 37 through the slots 2% or the rods 29, it will be clear that because of their wedge formation they will tend to draw the rods 29 upwardly, but because of the tact that the locking members 30 are now in engagement with the stationary collar 22 it will be clear that this tendency is converted into downward movement of the head 15 upon the collar, thereby compressing the gasket 24c and providing a fluid-tight .connection between the body and collar. As the locking members 30are maintained in engagement with the lower edge of the collar 22 it will be clear that the bodyvlo will be maintained in tightly seated position upon the collar and locked against upward.
movement irrespective of the internal pressure within the well casing.
lln order that a measuring cable can be extended through the body 15 for determining the depth to which a cement plug is lowered into the well casing, we have provided the transverse projection 16 with a vertical opening communicating with the chamber 19 and having'a stug boxll removably fitted therein to prevent leakage past the cable when the latter is in the opening. Although we have herein shown and described only one form of cementing head embodying our invention, it is to be understood that various changes and modifications may be made herein without departing from the spirit of the invention and the spirit and scope of the appended claims.
What we claim is:
1. A. cementing head comprising a body adapted to be supported on a coupling collar and having a groove therein for receiving the upper ed e of the collar, a compressible member wit in said groove, and means adapted to engage said collar for securing neaaoaa the body to the collar and for compressin said compressible member to provide a fiui tight joint between the body and collar.
2. 'A cementing head com rising a body having an annular groove t erein adapted to receive a coupling collar, a compressible gasket within said groove, locking members carried by the body and adapted to embrace a well casing at a point below the collar so as to abut the latter, and means co-operating with the body for forcing the body in the direction of the locking members whereby a fluid tight joint is provided between the body and collar.
3. A cementing head comprising a body having an annular groove adapted to receive a coupling collar and being formed with openings through which fluids are adapted to be introduced to a well casing, a compressible gasket disposed within the groove between the body and collar, co-operative locking members adapted'to embrace a well casing at a point below and abutting the collar, and elements mounted in the body and connected to the members to permit vertical movements of the members to draw the body toward the collar, -thus compressing the gasket, and to allow outward movement of the members to disengage the collar.
4. A cementing head comprising a body having tapered openings therein, semi-circular locking members, rods loosely fitted in the openings and secured to the locking members to allow vertical and swinging movements of the members, the body, looking members and rods being at all times in assembled relation, means forlatching the members together, and means engaging the body and rods for forcing the body downwardly on the rods when the body is in applied position upon a well casing.
HERBERT A. DAVIS. CLEO 1E. DAVIS.