US2795301A - Drilling rig safety brake - Google Patents

Drilling rig safety brake Download PDF

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US2795301A
US2795301A US42563354A US2795301A US 2795301 A US2795301 A US 2795301A US 42563354 A US42563354 A US 42563354A US 2795301 A US2795301 A US 2795301A
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drilling rig
drum
brake
plate
drilling
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William B Driver
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/06—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect
    • B66D5/10—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect embodying bands
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0971—Speed responsive valve control
    • Y10T137/1026—Speed change and excess speed valve control

Definitions

  • the present invention relates to the oil well drilling industry and more particularly to a safety device for actuating the brake control lever on a rotary drilling rig upon the failure of the automatic-driller.
  • a number of the recently developed rotary drilling rigs have been equipped with a control unit which is known in oil eld parlance as an automatic-driller, as above referred to.
  • This device lis located adjacent the position the driller usually stands while operating the rig and has operative connections with the controls of the drilling rig, which are usually actuated by hydraulic oil pressure from a pump driven by the source of power for the drilling rig.
  • rllhis automatic-driller is used for maintaining a constant rate of feeding the drill pipe into the'hole or to regulate the penetration of the drill bit by the -amount of weight of ⁇ the drill pipe.
  • the device of the present inven- -tion is designed to be installed to actuate the brake control lever upon the failure of the automatic-driller.
  • the invention accomplishes this by a governor actuated valve axially mounted to a small wheel, rotatably contacting the periphery of one of the rnain brake drums of the drilling rig.
  • the governor actuated valve admitting pressure to a hydraulic cylinder operatively connected to the brake control lever which stops the rotation of the brake drum and the draw works.
  • Another object is to provide a safety device of this class which may be adapted for use in connection with any type of rotary drilling rig.
  • Still another object of this invention is to Aprovide a safety device that is comparatively cheap to manufacture.
  • Yet another object of this invention is to provide a device that is completely automatic in its operation.
  • a further object of this invention is yto provide a device which may be easily disconnected from the drilling rig when its use is not desired.
  • Figure l is a fragmentary elevational end view of the draw works of a rotary drilling rig with the device installed thereon;
  • Figure 2 is an elevational side view of the device, similar to Figure 1, but on a larger scale 1to more clearly show the details thereof;
  • Figure 3 is a perspective view of the device per se.
  • Figure 4 is-a fragmentary elevational view partly in section, showing the details of a portion of the device.
  • the reference numeral 1 indicates, as a whole, the drillers end of the draw works of a ⁇ conventional rotary drilling rig.
  • the reference numeral 2 indicates the main drum at the drillers end of the drum shaft having a-b'rake band therearound, not shown, which is ⁇ operatively connected to and actuated by a brake control lever 3.
  • the reference numeral 16 indicates the device, as a whole, comprising, a ⁇ rectangular base plate 11 having an upper surface 9 and a pair of rigid longitudinally extending arms 12 at one-end.
  • a pair of elongated upstanding strap metal brackets 14 To the outermost end of each arm 12,'respectively, is pivot-ally attachedby bolts and nuts 13 a pair of elongated upstanding strap metal brackets 14, of a selected length, havingtheir upper ends 17'turned 4at right angles and rigidly connected to a suitable beam 15 of the rig bylbolts and nuts 16 (Figs. l and 2).
  • To the opposite end of the plate 11 is rigidly attached, preferably as by welding, a pair of spaced-apart depending longitudinallyextending alignedly perforated lugs 2t).
  • a rod 21, substantially the same length as the spacing .of the lugs 2li, has its respective ends pivotally disposed axially within the aligned perforations of the lugs 20, as at 22.
  • To one side of the rod 21 adjacent each lug is rigidly attached a pair of parallel bolts 23, perpendicular to the rod 21.
  • a pair of vertically disposed strap iron brackets 24 each have their respective end portions 25 and 26' formed in right angle co-operative parallel relation forming a U-shape. T'he depending leg end portions 26 are through-perforated to loosely receive the bolts 23, respectively, and are held in slidable relation therearound by nuts 27.
  • the upper leg ends 25 are through perforated for connection with the support 15 by bolts and nuts 2S.
  • a metal disc or washer 30 is rigidly connected axially to each bolt 23, respectively, at a selected point spaced from the bracket end 26.V
  • a helically wound compression spring 31 is axially disposed around each bolt 23, respectively, between the disc 30 and the bracket end 26 for the purposes more fully explained hereinbelow.
  • a shaft 35 of a selected diameterand having a length slightly greater than the width of the plate 11 is rotatably mounted transversely to the upper surface 9 of the-plate ll'nby rigidly connected suitable bearings 36.
  • a wheel 38, of a selected diameter is rigidly mounted axially to o-ne 'end of the shaft 3S in face to face alignment with the brake drum 2 and with a portion of the-periphery of the wheel 38 contacting' ⁇ a portionof the periphery of the drum 2.
  • an inertia type governor 40 comprising, an elongated through-perforated rectangular base bar 43 rigidly connected perpendicularly to the shaft 35 through the perforation by ya suitable key, not shown, and is held thereon by the washer 41 and the nut 42.
  • the ends of the base 43 are vertically slotted to pivotally receive on pivot, pins 46 the ends of a pair of oppositely disposed governor arms 44, each having an enlarged outer end portion 45 (Fig. 4).
  • the arms 44 are held in idle or collapsed position as shown by the solid lines of Fig. 4, by a suitable tension spring 47 connected to each arm 44 and the adjacent side of the washer 41, respectively.
  • a ,conventional quick opening valve-cock 50 having a laterally extending throttle arm 51, slanted downwardly at its free end, as at 52, is threadedly engaged between the ends 53 and 54, respectively, of a hydraulic pressure supply line connected to a hydraulic pump, not shown, of the drilling rig 1.
  • the valve-cock 50 is held in spaced parallel relation above the upper surface 9 of the plate 11 with the throttle arm spaced above the governor 40, by a pair of upstanding suitable split clamps 55 rigidly connected at one end of the ⁇ upper surface 9 of the plate 11 and grippingthe lines 53 and 54,'respectively.
  • a conventional hydraulic cylinder 60 is pivotally connected at its base end 64 to the beam 15 by a pivot pin 61.
  • the piston end 62 of the cylinder 60 is pivotally connected by a pivot pin 63 to the brake control lever 3 adjacent its free end (Fig. l).
  • the line 54 is con nected to the cylinder 60 in a conventional manner. Whenever ⁇ the drum 2 starts to unwind the drilling line, not shown, by rotation in the direction of the arrow (Fig. l) due to some mechanical failure of the conventional equipment, the drum 2, being substantially larger circumferentially than the wheel 38, rotates the wheel 38 and shaft 35 very rapidly which actuates the governor 40 by centrifugal force.
  • a link 65 of a selected length is pivotally connected at one end between a pair of upstanding ears 66 rigidly connected to the upper surface 9 of the plate 11 adjacent one end 26 of a bracket 24.
  • the free end of the link 65 is provided with a laterally extending hook portion 67 adapted for contaction with the upper surface of the end 26 ⁇ of the bracket 24.
  • the plate 11 is manually pivoted upwardly around the bolts 13 ,compressing the springs 31 which raises the wheel 38 from Contact with the drum 2, as shown by dotted lines Fig. 2, and the link 65 is pivoted upwardly placing the hook portion 67 over the end 26, as shown in dotted lines, Fig. 2.
  • the link 65 then holds the device 10 in an inoperative position until the link 65 is again released.
  • the device is installed on a drilling rig in the manner described herein above, and is to be used with an automatic drilling control. If at any time the drilling control mechanism fails, which allows the drilling cable to unwind oit of the cable drum shaft, the drum 2 rotates the wheel 38 and causes the governor 40 to open the valve-cock 50 which actuates the hydraulic cylinder 60 by hydraulic fluid pressure to depress the brake control lever 3 which stops the rotation of the drum 2 and prevents damage to the drilling equipment. When it is desired to use the drilling rig without the device 10 being connected, it may be disengaged from contact with the drum 2 as described hereinabove, and the hydraulic cylinder pivot pin 63 removed, thus allowing conventional operation of the drilling rig 1.
  • a safety brake for a rotary drilling rig having a rotating brake drum and having a brake control lever including: a substantially horizontally disposed rectangular plate pivotally mounted at one end on said rig adjacent the periphery of said brake drum; a pair of substantially U-shaped brackets each rigidly connected in depending relation by one leg of the U-shape to said rig above the free end of said plate disposing the depending leg of said bracket in spaced parallel relation above the free end oi said plate, the depending leg of each said bracket having a perforation intermediate its ends; a pair of bolts pivotally connected at one end to the free end of said plate, said bolts slidably connected to the respective depending legs of said brackets through said perforations for permitting vertical movement of the free end of said plate toward and away from said brackets; a helical spring axially disposed around each said bolt for normally urging the free end of said plate away from said brackets; a shaft rotatably carried transversely by the upper surface of said plate in axial parallel relation with said drum,

Description

June l1, 1957 w. B. DRIVER DRILLING RIG SAFETY .BRAKE 2 Sheets-Sheet 1 Filed April 26. 1954 QINIVENTOR.V
A 7' TORNE.
. .im 11', '1957 w; B. DRIVER 2,795,301
DRILLING RIG SAFETY gAxE 2 sheets-snelst g Filed April 26, 1954 A T TRNEY masser nanars@ nro sanary naar@ William E., Driver, Wynnewood,
Application April 26, 1954, Serial No. 425,633
2 Claims. (Cl. 18S- 189) The present invention relates to the oil well drilling industry and more particularly to a safety device for actuating the brake control lever on a rotary drilling rig upon the failure of the automatic-driller.
A number of the recently developed rotary drilling rigs have been equipped with a control unit which is known in oil eld parlance as an automatic-driller, as above referred to. This device lis located adjacent the position the driller usually stands while operating the rig and has operative connections with the controls of the drilling rig, which are usually actuated by hydraulic oil pressure from a pump driven by the source of power for the drilling rig. rllhis automatic-driller is used for maintaining a constant rate of feeding the drill pipe into the'hole or to regulate the penetration of the drill bit by the -amount of weight of `the drill pipe. By using thisk automatic-driller lin connection with a drilling rig itis not necessary that the drillel remain at his post all the time; thus allowing him more freedom during the time it takes for the Kelly-joint to go downward through the rotary table. However one fault of the automaticdriller is that the pressure lluid pump is chain driven and when this chain breaks, as happens occasionally, the controls of the automatic-driller are then released and the weight of the traveling blocks, swivel and rotary hose unwinds the drilling cable olf of the drilling rig drum shaft and all of the above named equipment falls on the derrick floor. The drilling rig keeps turning the Kellyjoint and considerable damage to the drilling equipment results, which may easily run into the thousands of dollars to repair. or replace damaged or broken parts.
It is upon such a drilling rig, equipped with an automatic-driller that the device of the present inven- -tion is designed to be installed to actuate the brake control lever upon the failure of the automatic-driller. The invention accomplishes this by a governor actuated valve axially mounted to a small wheel, rotatably contacting the periphery of one of the rnain brake drums of the drilling rig. Upon failure of the automaticdriller the rapid rotation of the brake drum spins the small wheel opening the governor actuated valve admitting pressure to a hydraulic cylinder operatively connected to the brake control lever which stops the rotation of the brake drum and the draw works.
Accordingly it is the principal object of ythis invention to provide a safety device for stopping the unwinding of the drilling line from the drum shaft of a rotary drilling rig equipped with an automatic-driller by actuating the brake control lever.
Another object is to provide a safety device of this class which may be adapted for use in connection with any type of rotary drilling rig.
Still another object of this invention is to Aprovide a safety device that is comparatively cheap to manufacture.
Yet another object of this invention is to provide a device that is completely automatic in its operation.
A further object of this invention is yto provide a device which may be easily disconnected from the drilling rig when its use is not desired.
Other objects will be apparent from the following description when taken in conjunction with the accompanying two sheets of drawings, wherein:
Figure l is a fragmentary elevational end view of the draw works of a rotary drilling rig with the device installed thereon;
Figure 2 is an elevational side view of the device, similar to Figure 1, but on a larger scale 1to more clearly show the details thereof;
Figure 3 is a perspective view of the device per se; and,
Figure 4 is-a fragmentary elevational view partly in section, showing the details of a portion of the device.
Like characters of reference designate like parts in those figures of the drawings in which Ithey occur.
In the drawings: p
The reference numeral 1 indicates, as a whole, the drillers end of the draw works of a `conventional rotary drilling rig.
The reference numeral 2 indicates the main drum at the drillers end of the drum shaft having a-b'rake band therearound, not shown, which is `operatively connected to and actuated by a brake control lever 3.
Referring more particularlytolFigure 3,`the reference numeral 16 indicates the device, as a whole, comprising, a `rectangular base plate 11 having an upper surface 9 and a pair of rigid longitudinally extending arms 12 at one-end. To the outermost end of each arm 12,'respectively, is pivot-ally attachedby bolts and nuts 13 a pair of elongated upstanding strap metal brackets 14, of a selected length, havingtheir upper ends 17'turned 4at right angles and rigidly connected to a suitable beam 15 of the rig bylbolts and nuts 16 (Figs. l and 2). To the opposite end of the plate 11 is rigidly attached, preferably as by welding, a pair of spaced-apart depending longitudinallyextending alignedly perforated lugs 2t). A rod 21, substantially the same length as the spacing .of the lugs 2li, has its respective ends pivotally disposed axially within the aligned perforations of the lugs 20, as at 22. To one side of the rod 21 adjacent each lug is rigidly attached a pair of parallel bolts 23, perpendicular to the rod 21. A pair of vertically disposed strap iron brackets 24 each have their respective end portions 25 and 26' formed in right angle co-operative parallel relation forming a U-shape. T'he depending leg end portions 26 are through-perforated to loosely receive the bolts 23, respectively, and are held in slidable relation therearound by nuts 27. The upper leg ends 25 are through perforated for connection with the support 15 by bolts and nuts 2S. A metal disc or washer 30 is rigidly connected axially to each bolt 23, respectively, at a selected point spaced from the bracket end 26.V A helically wound compression spring 31 is axially disposed around each bolt 23, respectively, between the disc 30 and the bracket end 26 for the purposes more fully explained hereinbelow.
A shaft 35 of a selected diameterand having a length slightly greater than the width of the plate 11 is rotatably mounted transversely to the upper surface 9 of the-plate ll'nby rigidly connected suitable bearings 36. A wheel 38, of a selected diameter, is rigidly mounted axially to o-ne 'end of the shaft 3S in face to face alignment with the brake drum 2 and with a portion of the-periphery of the wheel 38 contacting'` a portionof the periphery of the drum 2. On drilling rigs which have aprotective housing over the brake drum 2, it may be necessary to plained hereinbelow. To the opposite end of the shaft 35 is rigidly connected an inertia type governor 40, comprising, an elongated through-perforated rectangular base bar 43 rigidly connected perpendicularly to the shaft 35 through the perforation by ya suitable key, not shown, and is held thereon by the washer 41 and the nut 42. The ends of the base 43 are vertically slotted to pivotally receive on pivot, pins 46 the ends of a pair of oppositely disposed governor arms 44, each having an enlarged outer end portion 45 (Fig. 4). The arms 44 are held in idle or collapsed position as shown by the solid lines of Fig. 4, by a suitable tension spring 47 connected to each arm 44 and the adjacent side of the washer 41, respectively. Upon the rapid rotation of the shaft 35 by the wheel 38, centrifugal force urges the governor arms 44 to pivot outwardly from the shaft toward the position, as shown in dotted lines (Figs. 3 and 4), for
purposes more fully explained hereinbelow.
A ,conventional quick opening valve-cock 50 having a laterally extending throttle arm 51, slanted downwardly at its free end, as at 52, is threadedly engaged between the ends 53 and 54, respectively, of a hydraulic pressure supply line connected to a hydraulic pump, not shown, of the drilling rig 1. The valve-cock 50 is held in spaced parallel relation above the upper surface 9 of the plate 11 with the throttle arm spaced above the governor 40, by a pair of upstanding suitable split clamps 55 rigidly connected at one end of the` upper surface 9 of the plate 11 and grippingthe lines 53 and 54,'respectively.
A conventional hydraulic cylinder 60 is pivotally connected at its base end 64 to the beam 15 by a pivot pin 61. The piston end 62 of the cylinder 60 is pivotally connected by a pivot pin 63 to the brake control lever 3 adjacent its free end (Fig. l). The line 54 is con nected to the cylinder 60 in a conventional manner. Whenever` the drum 2 starts to unwind the drilling line, not shown, by rotation in the direction of the arrow (Fig. l) due to some mechanical failure of the conventional equipment, the drum 2, being substantially larger circumferentially than the wheel 38, rotates the wheel 38 and shaft 35 very rapidly which actuates the governor 40 by centrifugal force. The enlarged ends 45 of the governor arms 44 being pivoted outwardly by this centrifugal force, contact the downward extension S2 of the throttle lever 51 to open the valvecock 50. Hydraulic pressure then flows through the line 54 and actuates the cylinder 60 which depresses the brake con trol lever and stops the rotation of the drum 2. Normally the function of the springs 31 is to urge the plate 11 downwardly to keep the wheel 38 in frictional engagement with the periphery of the drum 2 at all times. Whenever it is desired to operate the drilling rig without the use of the safety brake 10, the following mechanism is provided. A link 65 of a selected length, is pivotally connected at one end between a pair of upstanding ears 66 rigidly connected to the upper surface 9 of the plate 11 adjacent one end 26 of a bracket 24. The free end of the link 65 is provided with a laterally extending hook portion 67 adapted for contaction with the upper surface of the end 26 `of the bracket 24. The plate 11 is manually pivoted upwardly around the bolts 13 ,compressing the springs 31 which raises the wheel 38 from Contact with the drum 2, as shown by dotted lines Fig. 2, and the link 65 is pivoted upwardly placing the hook portion 67 over the end 26, as shown in dotted lines, Fig. 2. The link 65 then holds the device 10 in an inoperative position until the link 65 is again released.
Operation The device is installed on a drilling rig in the manner described herein above, and is to be used with an automatic drilling control. If at any time the drilling control mechanism fails, which allows the drilling cable to unwind oit of the cable drum shaft, the drum 2 rotates the wheel 38 and causes the governor 40 to open the valve-cock 50 which actuates the hydraulic cylinder 60 by hydraulic fluid pressure to depress the brake control lever 3 which stops the rotation of the drum 2 and prevents damage to the drilling equipment. When it is desired to use the drilling rig without the device 10 being connected, it may be disengaged from contact with the drum 2 as described hereinabove, and the hydraulic cylinder pivot pin 63 removed, thus allowing conventional operation of the drilling rig 1.
Obviously the invention is susceptible to some change or alteration without defeating its practicability, and I therefore do not wish to be confined to the preferred embodiment shown in the drawings and described herein, further than I am limited by the scope of the appended claims.
I claim:
1. A safety brake for a rotary drilling rig having a rotating brake drum and having a brake control lever, including: a substantially horizontally disposed rectangular plate pivotally mounted at one end on said rig adjacent the periphery of said brake drum; a pair of substantially U-shaped brackets each rigidly connected in depending relation by one leg of the U-shape to said rig above the free end of said plate disposing the depending leg of said bracket in spaced parallel relation above the free end oi said plate, the depending leg of each said bracket having a perforation intermediate its ends; a pair of bolts pivotally connected at one end to the free end of said plate, said bolts slidably connected to the respective depending legs of said brackets through said perforations for permitting vertical movement of the free end of said plate toward and away from said brackets; a helical spring axially disposed around each said bolt for normally urging the free end of said plate away from said brackets; a shaft rotatably carried transversely by the upper surface of said plate in axial parallel relation with said drum, the length of said shaft being greater than the width of said plate; a wheel axially mounted on one end of said shaft in rotatable peripherial contact with said brake drum; an inertia governor axially carried by the end of said shaft opposite said wheel; a hydraulic cylinder pivotally connected at each end to said rig and said brake control lever, respectively, said cylinder having a hydraulic supply line extending longitudinally across said plate; a .Pair of clamps rigidly carried in longitudinal spacedapart relation by the upper surface of said plate for holding said supply line in spaced parallel relation above said plate; and a quick-opening valve in said supply line between said clamps, said valve having a laterally extending handle normally projecting toward the extended rotating path of said governor when said valve is in closed position, whereby rapid rotation of said brake drum revolving said wheel actuates said governor for contacting and moving said valve handle to open position for actuating said cylinder and depressing said brake lever thereby stopping the rotation of said brake drum.
2. Structure as specified in claim l and a latch pivotally connected at one end to the upper surface of said plate adjacent the depending leg of one said U-shaped bracket, said latch having a hook-shaped free end for engagement with the upper surface of the depending leg disposing the periphery of said wheel in spaced-apart relation with said brake drum for inactivating said safety brake.
References Cited in the le of this patent UNITED STATES PATENTS 705,623 Stevens `Tuly 29, 1902 785,817 Mason Mar. 28, 1905 950,477 Courtois Mar. l, 1910 1,634,565 Wallbillich July 5, 1927
US42563354 1954-04-26 1954-04-26 Drilling rig safety brake Expired - Lifetime US2795301A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696377A (en) * 1985-09-27 1987-09-29 Ltv Energy Products Company Brake system for drawworks
US5425435A (en) * 1993-09-15 1995-06-20 Gregory Rig Service & Sales, Inc. Brake system for drilling equipment
US10501992B2 (en) 2012-12-21 2019-12-10 Epiroc Rock Drills Aktiebolag Device and method in respect of a rock drill rig, drill string component, handling device and rock drill rig

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US705623A (en) * 1901-12-05 1902-07-29 George W Stevens Brake.
US785817A (en) * 1903-08-25 1905-03-28 John A Woods Controlling apparatus for motor-vehicles.
US950477A (en) * 1909-10-18 1910-03-01 Luke Courtois Brake-operating mechanism.
US1634565A (en) * 1924-08-19 1927-07-05 Distance Speed Recording Compa Drive for speed-responsive instruments

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US705623A (en) * 1901-12-05 1902-07-29 George W Stevens Brake.
US785817A (en) * 1903-08-25 1905-03-28 John A Woods Controlling apparatus for motor-vehicles.
US950477A (en) * 1909-10-18 1910-03-01 Luke Courtois Brake-operating mechanism.
US1634565A (en) * 1924-08-19 1927-07-05 Distance Speed Recording Compa Drive for speed-responsive instruments

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696377A (en) * 1985-09-27 1987-09-29 Ltv Energy Products Company Brake system for drawworks
US5425435A (en) * 1993-09-15 1995-06-20 Gregory Rig Service & Sales, Inc. Brake system for drilling equipment
US10501992B2 (en) 2012-12-21 2019-12-10 Epiroc Rock Drills Aktiebolag Device and method in respect of a rock drill rig, drill string component, handling device and rock drill rig

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