US1179500A - Pipe-clamp. - Google Patents

Description

J. T. S. BROWN, JR.

PIPE CLAMP.

APPLICATION FILED oEc.. 1. 1915.

1,179,500. Patented Apr. 18, 1916.

W g 111M 3 o, 3 I 3 Fi i- 1 3/ i 15 I. r a Q I I a 9 j: M 7 M 1/ A TTOR/VE Y JOHN T. s. BROWN, JR.,'0F rnos'rnor', KENTUCKY.

PIPE-CLAMP.

Specification of Letters Patent.

Patented Apr. 18, 1916.

Application filed December 1', 1915; Serial No; 64,543.

- annexed specification;

This? invention relates to pipe clamps of the" classdesigned to supportapipe when withdrawing. it from, or lowering it in a deep well.

In withdrawing av drop, pipe from a well the; customary method is'to connect suitable tractive means with the pipe, and a stop; or clamp, comprising? a pair of timbersprovided with opposed concavities for the re- 7 ception of the pipe; is disposedabout the pipe; and? secured thereom. next to the ground, by means o1": transverse bolts. Then the tractive means has reached the limit of its m0Vement-,. the' stop which is then removed from the ground", is" released by 1oosening;thebolts,: and lowered to .the groundand again secured- Thetra'ctive means isthen eased ofi'-,-the stop sustaining the pipe I whileanew hold is secured with thetractivemeans: lnr'l'owerin'g. the pipe in the well, the stop is initially secured ,on the pipe distance fromtheground equal to the lowering; movement of the tractive means and". serves when it comes in contact, with the ground to hold the pipe while "the tractive means is being moved up tov secure a fresh hold: It alsoserves to'catcheandi hold the pipe in. case of any; mishap to' thetrac tivermeans: 'llfhis havin'g to shiftthe stop at everyr step" 111 the progress of the Wit/11's drawal or' lowering the drop" pipe makes-the proposition a laborious and tedious operat-iona, e

object 0t this invention is-to'zp'rovide means which? while permitting a free with= d-rawal-of-the pipe will instantly check any retrograde vmove'mentrthereofi Another object is'the provisioli of means which will not oppose the lowering of the pipe as long as the'movement thereofis steady, but will stop its descent if there-is sudden acceleration of its movement, such as would occur if-the tractive meansshould fail 'or its' connection'with' the pipe slip.

A' turther object isgthe provision of means of the classdescribed which may be conven ieiitly manipulated; per-mittinga expeditious movement of the drop pipe, which will be eflicient and durable in service and economical in construction.

With the foregoing and other objectsin view, the invention consists of the novel construction and arrangement of parts illustrated in the accompanying drawing, which forms a part of thisspecificatiom wherein is set forth anembodiment of" the invention, but it isto be understood-that such changes and modifications'may be resorted to ascome within the scope of the appended claims;

Referringv to the drawing whe'rein'similar reference characters d'esignate like parts: in the several views Figure 1 is a perspective View of my improved clamp showing itin connection with a pipe being, lowered-r Fig; 2, a" detacheddetailof the centering device: Fig. 3,, a detached viewof oneofthe dogs:

Referring in detail to the drawingthe reference numeral -1- designates a base, or platform, which may beo'f any suitable material, comprising. two sections united by transverse bolts 2 and having acentral op'ening-3 of suflicientsize to" permit the passage of a pipe-of maximum size.- Mounted on the base about theopeningare a" plurality of guides or centering members -4: which are adapted to contact'with'a pipe 5 which depends through the opening; Each oi the guides comprises a tube 6 which is adjujstably secured in bearings, orj brackets by suitable means-V such as set screws-8 in order that itmay beadjusted to-aud from theeater of theppenin-g-"to accommodatepipeof different sizes. A rodprovided-'- at; each endwith a longitudinal. slot as -10 and 11', is slidably disposed inthe-tube 6 and extendstherefrom at each end. A wheel -12'v is rotatably mountedin the forward slot 10. A: pinI 1-3 passed. transversely through the tube 6, near-the rear end thereof, passes-through the slot 11,; andserves to prevent rotation of the; r0d,, thus maintain; ing thewh'eel- 12 in a vertical position. A. coiled compression spring disposed about the forward portion'of the rod, bears respectively against theiforward end of the tubeiand: a washer -f15'' which is'secured on-the rod in the rear of the-Wheel; The

rear. end oi the rod is screw threaded for mit joints in the pipe to pass. A plurality of dogs, or jaws 17, are disposed about the opening 3 in position to be engaged with the depending pipe 5. The dogs are mounted on the platform in such a manner that they may be adjusted to seize different size pipe. Any suitable method of mounting may be used. As illustrated a channel shaped bracket 18 is employed, having a plurality of alined transverse openings 19 in its opposed walls, which permit of the adjustment of the dog by means of a pin 20. The dogs are substantially ovate in shape, and are provided with a perforation 21 near the rear end for the passage of the pin 29, the forward end being provided with serrations 22 for engagement with the pipe. And an angular heel 23 at the rear end serves to limit its upward movement. The dogs are reversible, thereby prolonging their usefulness.

As described the device will serve to control the pipe during withdrawal thereof, the dogs being adjusted so that their forward ends lie against the pipe at an inclination slightly above the horizontal so that they will yield freely to upward movement thereof but instantly bite into and bring it to a stand still upon its slightest downward movement. Then a pipe is being lowered the dogs must be held up out of contact with the pipe during the lowering movement. For this purpose use is made of the apparatus now to be described. To the forward ends of the dogs, flexible connectives -Q5 are connected by suitable means such as clips 26. The connectives are connected to a common member such as a ring, or hoop 27, aifording means whereby all the dogs may be lifted at one time. A plurality of ropes 28, 29- are connected to the hoop at equi-distant points, in such a manner as to lift evenly thereon, and are led up over pulleys 30 which are removably attached to the pipe at a suitable hei ht above the hoop. From the pulleys 30 the ropes lead downward to and through pulleys 31-, secured to the platform. Traction exerted on the ropes after they have passed through the pulleys 31 will raise the hoop 27 and connected dogs and they will be maintained in the elevated position as long as the traction is constant. This traction may be accomplished manually or as illustrated, by means of a weight 32- attached to the ropes after they have passed over pulleys 33. Any relaxation of the tractive force on the hoop will permit the dogs to drop and engage the pipe. The descent of the pipe and attached pulleys 30, would cause a slack in the ropes, which would allow'the ring to fall, but that the slack is taken up by the tractive force of the weight 32, as

long as the downward movement of the pipe is constant, but any sudden acceleration of its movement, such as would occur if the lowering cable 3lwere to break,

would cause a slackage which would permit I conversant with the art to which it pertains,

without more extended description.

Having thus described my invention so that anyone skilled in the art pretaining thereto may make and use the same, I claim:

1. In a device of the character described, in combination, a platform having an opening for the passage of a pipe to be lowered, a clutch mounted on said platform and adapted to be engaged with the pipe to prevent downward movement thereof, and means connected respectively with said clutch and pipe for preventing engagement of the clutch with the pipe during uniform downward movement thereof, but permitting engagement upon sudden acceleration of said downward movement.

2. In a device of the character described, in combination with a platform having an opening for the passage of a pipe to be lowered, dogs mounted thereon and adapted to be engaged with the pipe to prevent downward movement thereof, means for holding the dogs out of engagement with the pipe during constant downward movement thereof but permitting said engagement upon any sudden acceleration of said downward movement.

3. In combination with a platform, having an opening, a pipe to be lowered depending through said opening, a dog mounted on said platform and adapted to be engaged with said pipe to prevent downward movement thereof, a pulley removably attached to the pipe at a point elevated above the platform, a second pulley attached to the platform, a cord connected to said dog and leading'up over said first named pulley thence downward under said second named pulley and tractive means connected to said cord.

4. In combination with a platform having an opening, a pipe to be lowered depending through said opening, a dog mount- I ed on'said platform and adapted to be engaged with said pipe to prevent downward movement thereof, a pulley removably attached to the pipe at a point elevated above the platform, a second pulley attached tothe platform, a third pulley supported at a point above said second named pulley, ,a

cord connected to said dog and leading upward over said first named pulley thence downward under said second named pulley, thence upward over said third named pulley and a weight attached to said cord.

5. In combination with a platform having an opening, a pipe to be lowered depending through said opening, a plurality of dogs mounted on said platform and adapted to be engaged with said pipe to prevent downward movement thereof, a common member to which said dogs are connected and whereby they may be lifted in unison, pulleys removably attached to the pipe at a point elevated above the platform, other pulleys attached to the platform, cords connected to said common member and lead- 20 ing successively over said pulleys in the order named, and tractive means connected to the rope.

6. In combination with a platform having an opening, a pipe to be lowered depending through said opening, .a plurality of centering members disposed about said opening, said members adapted to yield to permit the passage of couplings in the pipe, a plurality of dogs mounted on said platform and adapted to be engaged with said pipe to prevent downward movement thereof, a pulley removably attached to the pipe at apoint elevated above the platform, a second pulley attached to the platform, a cord connected to said dog and leading up over said first named pulley, thence downward under said second named pulley and tractive means connected to said cord.

JOHN T. S. BROWN, JR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G. a

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