US828708A - Apparatus for extracting and applying well-tubing, &c. - Google Patents

Apparatus for extracting and applying well-tubing, &c. Download PDF

Info

Publication number
US828708A
US828708A US29657206A US1906296572A US828708A US 828708 A US828708 A US 828708A US 29657206 A US29657206 A US 29657206A US 1906296572 A US1906296572 A US 1906296572A US 828708 A US828708 A US 828708A
Authority
US
United States
Prior art keywords
derrick
windlass
truck
base
tubing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US29657206A
Inventor
James O'neill Bruen
William Ackerman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US29657206A priority Critical patent/US828708A/en
Application granted granted Critical
Publication of US828708A publication Critical patent/US828708A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/36Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes

Definitions

  • This invention relates to an apparatus for extracting casings, tubing, and suckerrods from oil and gas .wells and also for lowering the same down into such Wells for appli cation therein.
  • the object of the invention is to provide an apparatus of this character which is simple of construction, powerful and eflicient in operation and use, comparatively inexpensive of production, and capable of being readily transported from place to place.
  • Another object is to provide a device of this character which may be operated by manual labor or horse or other power.
  • Figure 1 is a front elevation of the device as arranged for use with the derrick elevated, a portion of the derrick being broken away on account of the confined space for illustration.
  • Fig. 2 is a side elevation of the same, showing the elevated or operative position of the derrick in dotted lines and the lowered position thereof in full lines; and
  • Fig. 3 is a side elevation showing the ratchet mechanism for manually operating the Windlass.
  • the numeral 1 denotes a suitablyconstructed truck-frame mounted on supporting-Wheels 2 and provided at the upper end thereof with a cross-bar 3. Rigidly attached to and extending from said truckframe are lower bracing-arms 4, reinforced from the truck-frame by bracing-irons 5 and pivotally attached, as indicated at 6, to the rear portions of foot-blocks 7.
  • the footblocks 7 are spaced apart, as shown in Fig. 1, to form a base-support for the frame and derrick when the latter is elevated for operation.
  • Upper bracing-arms 8 are connected at their rear ends, as indicated at 9, to the cross-bar 3 of the truck-frame and extend forwardly therefrom at an upward inclination and are connected at their forward or free ends by a transverse cross-bar 10, carrying a guide pulley or sheave 11.
  • Standards or link-bars 12 support the forward ends of the upper brace-bars 8 and are pivoted at their upper ends to said bars, as shown at 13, and at their lower ends, as shown at 14, to the lower ends of the side arms 15 of a derrick 16.
  • the lower ends of the said arms 15 of the derrick are fixed to a transverse shaft or axle 17 j ournaled in bearings 18 on the foot or base blocks 7, thus adapting the derrick to be swung to a substantially perpendicular position to rest against the cross-bar 10, as indicated in full lines in Fig. 1 and dotted lines in Fig. 2, or tobe turned down to rest upon the cross-bar 3 of the truck 1, as indicated in full lines in Fig. 2.
  • the derrick When the derrick is adjusted to an erect position for operation, it will be limited in its forward movement by said cross-bar 10, which will permit it to assume a forward inclination slightly beyond the vertical to permit the hoisting and lowering cable hanging pendent therefrom to project downward in advance of the supporting-frame and to be operated without interference therefrom.
  • the pivotal connection of the foot-blocks 7 with the lower bracing-arms 4 and the pivotal connections of the standards or link-arms 12 permit the derrick to swing freely from raised to lowered position Without throwing strain upon the parts of the supporting-frame.
  • the side arms 15 of the derrick are'conneoted by a cross-bar 19 and at intervals above the same by other cross-bars 20, and the upper or free end of the derrick carries pulleys 21 and 22 and also loops or eyes 23, the latter being provided for the attachment of guide-chains to enable the derrick to be firmly braced against movement when elevated to operative position.
  • the cross-bar 19 carries a ring or like fixture 24 for the attachment of the hoisting and lowering line when elevating and lowering the derrick, as hereinafter described.
  • a reel or Windlass 25 is mounted on the derrick in the space bounded by the lower portions of the side bars 15, axle 17, and cross-bar 19 and carries a set of drums 26 of varying diameter for the attachment of a Windlass-operating rope or cable.
  • Said cord or cable may be attached to either one of the drums, according to the amount of power required to operate the Windlass, and draft-ani- IIO mals maybe attached to the cable, or the latter may be run out by any other suitable power to eifect the rotation of the Windlass.
  • the Windlass also carries a brake-head or disk 27, adapted to be engaged by a brakeband 28, one end of said band being fixed to the cross-bar 19, while the opposite end thereof is connected to the crank end of an operating-lever 29, pivotally mounted upon the derrick, whereby the action of the windlass may be controlled and the same locked against movement when desired.
  • a crankhandle 30 To the shaft of the Windlass is connected a crankhandle 30, by which the Windlass may be operated by manual power to enable the hoisting and lowering line to be slacked or drawn taut for adjusting the grapples or extracting device mounted upon the free end of the line to enable said device to be conveniently connected with or disconnected from the part to be extracted from or lowered into the well.
  • the head 27 is provided with ratchet-teeth 3 1, adapted to be engaged by a dog or pawl 32, pivotally connected with an operating-lever 33, pivoted to oscillate upon a bracket 34, fastened to one of the side bars 15 of the derrick.
  • an operating-lever 33 pivoted to oscillate upon a bracket 34, fastened to one of the side bars 15 of the derrick.
  • the dog or pawl 32 may be brought into engagement with the ratchet-teeth 31 to intermittently rotate the Windlass for the purpose of raising the grappling or extracting device from the well and elevating the same to adjust it for more convenient application to a rod, tube, or casing-section to be elevated.
  • a hoisting and lowering line 35 is fixed and wound at one end around the Windlass 25 and then passes therefrom upward along the upper side of the derrick and is passed around the supporting-pulley 21, and thence continues when the derrick is in operative position downward over the guide-pulley 11, whence its .free end projects downward in advance of the base-blocks 7 for attachment to the grapple or extracting device.
  • the grapple or extracting device is detached from the free end of the line and the latter made fast to the ring or fixture 24, whereupon by turning the wheel 25 in a forward direction the line will swing the derrick forward until it comes in contact with the cross-bar 10.
  • the free end of the line is disconnected from the fixture 24 and the grapple or extracting device applied thereto for use.
  • the free end of the line is also attached to the fixture 24 and sufficient slack in the line allowed to permit the derrick to be pushed by hand backward beyond the perpendicular, so that it will swing by gravity to lowered position, its movement to such position being controlled by means of the band-brake.
  • the apparatus When the derrick is lowered, the apparatus may be tilted to a horizontal position by pulling down upon the top or free end of the derrick and a draft attachment suitably applied to said top end of the derrick to enable the device to be transported on the wheeled truckframe 1.
  • the parts are so constructed and proportioned that the weight of the frame, reel, and base portion of the derrick will be slightly greater than the upper portion thereof, which projects beyond the cross-bar 3 when the derrick is in lowered position, so that while the greater weight of the frame and base portion will elevate the top end of the derrick when the latter is detached from the draft-animals 8o 7 the parts will be so nearly balanced as to render it easy for the draft-team to support and haul the apparatus.
  • the pulley 22 is provided to enable more than one hoisting and lowering line to be employed when an unusually heavy part or a number of-parts are to be elevated or lowered.
  • the action of the Windlass may be readily and conven- 9o iently controlled to slacken or tighten the line for disengaging and engaging the grapple or extracting device from or with the joint of tubing or part to be elevated or lowered, and
  • the ratchet mechanism further adapts the Windlass to be operated manually for removing parts or a string of tubing from a well in order to permit the grapple or ex tracting device to be detached from the tube.
  • the apparatus may be conveniently controlled in use, may be operated manually or by horse or other power, and may also be conveniently transported from well to well for use.
  • the weight of the derrick and load is supported by the baseblocks 7, and as the weight of the derrick is slightly more than counterbalanced by the weight of the truck-frame it will be understood that by the simple application of suitable guys or stays to the elevated derrick the latter will be firmly supported.
  • bars being fixed to the truck-frame and the forward ends of the lower sets of bars pivoted to the base, link-bars pivotally connected at their upper ends to the forward ends of the upper set of brace-bars, a derrick mounted on the base and pivotally connected to the lower ends of the link-bars, and hoisting and lowering means carried by the derrick.
  • a wheeled truckframe a base arranged in advance thereof, lower bracing-arms fixed at their rear ends to the truck and pivoted at their forward ends to the base, an upper set of bracing-arms pivoted at their rear ends to the truck and eX- tending forwardly at an upward inclination therefrom and connected by a cross-bar at their free ends, a derrick extending between said sets of bracing arms and pivotally mounted at its lower end upon the base, linkbars pivotally connected at their upper ends to the upper set of bracing-arms and at their lower ends to the derrick, and hoisting mechanism carried by the derrick.
  • a supportingframe provided with supporting wheels at one end, a supporting-base at its opposite end, a derrick pivotally mounted upon the base and adapted to be supported by the frame in raised or lowered position, a Windlass carried by the derrick, a hoistingline connected with the Windlass and guided by the derrick and frame, means for connecting said line with the derrick to adapt the latter to be raised and lowered, and a brake carried by the derrick to regulate the movement of the Windlass and line to adapt the derrick to be lowered by gravity.
  • a wheeled supporting-frame having a base adapted to rest upon the ground when the device is in operative position, a derrick pivotally mounted upon said base, a Windlass carried by the derrick and provided with ratchet-teeth, an oscillating lever having a pawl to engage said ratchet-teeth, a brake-band for regulating the action of the Windlass, means for operating said brake-band, and a hoisting-line supported by the brake and connected with the Windlass.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Description

PATENTED AUG. 14, 1906. J. ON. BRUEN & W. AGKERMAN.
APPARATUS FOR EXTRAGTING AND APPLYING WELL TUBING, &o.
APPLICATION FILED JAN.17, 190a.
2 snnm-snnm 1 rm: mamas PETERS cm, wnsnmcrou, D. c.
No- 828,708. PATENTED AUG. 14, 1906.
v I J- O'N. -BRUBN-& W. AGKBRMAN. APPARATUS FOR BXTRAGTINGAND APPLYING WELL TUBING, 8w.
APPLICATION FILED JAN. 17, 1906 2 SHEETS SHE-ET Z.
JAMES ONEILL BRUEN AND WILLIAM ACKERMAN, OF CHANUTE, KANSAS.
APPARATUS FOR EXTRACTING AND APPLYING WELL-TUBING, 800.
Specification of Letters Patent.
Patented Aug. 14, 1906.
Application filed n ry 17 1906. Serial No. 296,5 72.
To all whom, it may concern:
Be it known that we, JAMES ONEILL BRUEN and WILLIAM AOKERMAN, citizens of the United States of America, residing at Ohanute, in the county of Neosho and State of Kansas, have invented new and useful Improvements in Apparatus for Extracting and Applying Well-Tubing, &c., of which the following is a specification.
This invention relates to an apparatus for extracting casings, tubing, and suckerrods from oil and gas .wells and also for lowering the same down into such Wells for appli cation therein.
The object of the invention is to provide an apparatus of this character which is simple of construction, powerful and eflicient in operation and use, comparatively inexpensive of production, and capable of being readily transported from place to place.
Another object is to provide a device of this character which may be operated by manual labor or horse or other power.
With these and other objects in view the invention consists of the novel construction, combination, and arrangement of parts hereinafter fully described and claimed, reference .being had to the accompanying drawings, in which Figure 1 is a front elevation of the device as arranged for use with the derrick elevated, a portion of the derrick being broken away on account of the confined space for illustration. Fig. 2 is a side elevation of the same, showing the elevated or operative position of the derrick in dotted lines and the lowered position thereof in full lines; and Fig. 3 is a side elevation showing the ratchet mechanism for manually operating the Windlass.
Referring now more particularly to the drawings, the numeral 1 denotes a suitablyconstructed truck-frame mounted on supporting-Wheels 2 and provided at the upper end thereof with a cross-bar 3. Rigidly attached to and extending from said truckframe are lower bracing-arms 4, reinforced from the truck-frame by bracing-irons 5 and pivotally attached, as indicated at 6, to the rear portions of foot-blocks 7. The footblocks 7 are spaced apart, as shown in Fig. 1, to form a base-support for the frame and derrick when the latter is elevated for operation. Upper bracing-arms 8 are connected at their rear ends, as indicated at 9, to the cross-bar 3 of the truck-frame and extend forwardly therefrom at an upward inclination and are connected at their forward or free ends bya transverse cross-bar 10, carrying a guide pulley or sheave 11. Standards or link-bars 12 support the forward ends of the upper brace-bars 8 and are pivoted at their upper ends to said bars, as shown at 13, and at their lower ends, as shown at 14, to the lower ends of the side arms 15 of a derrick 16. The lower ends of the said arms 15 of the derrick are fixed to a transverse shaft or axle 17 j ournaled in bearings 18 on the foot or base blocks 7, thus adapting the derrick to be swung to a substantially perpendicular position to rest against the cross-bar 10, as indicated in full lines in Fig. 1 and dotted lines in Fig. 2, or tobe turned down to rest upon the cross-bar 3 of the truck 1, as indicated in full lines in Fig. 2.
When the derrick is adjusted to an erect position for operation, it will be limited in its forward movement by said cross-bar 10, which will permit it to assume a forward inclination slightly beyond the vertical to permit the hoisting and lowering cable hanging pendent therefrom to project downward in advance of the supporting-frame and to be operated without interference therefrom.
The pivotal connection of the foot-blocks 7 with the lower bracing-arms 4 and the pivotal connections of the standards or link-arms 12 permit the derrick to swing freely from raised to lowered position Without throwing strain upon the parts of the supporting-frame. At a suitable distance above the axle 17 the side arms 15 of the derrick are'conneoted by a cross-bar 19 and at intervals above the same by other cross-bars 20, and the upper or free end of the derrick carries pulleys 21 and 22 and also loops or eyes 23, the latter being provided for the attachment of guide-chains to enable the derrick to be firmly braced against movement when elevated to operative position. The cross-bar 19 carries a ring or like fixture 24 for the attachment of the hoisting and lowering line when elevating and lowering the derrick, as hereinafter described.
A reel or Windlass 25 is mounted on the derrick in the space bounded by the lower portions of the side bars 15, axle 17, and cross-bar 19 and carries a set of drums 26 of varying diameter for the attachment of a Windlass-operating rope or cable. Said cord or cable may be attached to either one of the drums, according to the amount of power required to operate the Windlass, and draft-ani- IIO mals maybe attached to the cable, or the latter may be run out by any other suitable power to eifect the rotation of the Windlass. The Windlass also carries a brake-head or disk 27, adapted to be engaged by a brakeband 28, one end of said band being fixed to the cross-bar 19, while the opposite end thereof is connected to the crank end of an operating-lever 29, pivotally mounted upon the derrick, whereby the action of the windlass may be controlled and the same locked against movement when desired. To the shaft of the Windlass is connected a crankhandle 30, by which the Windlass may be operated by manual power to enable the hoisting and lowering line to be slacked or drawn taut for adjusting the grapples or extracting device mounted upon the free end of the line to enable said device to be conveniently connected with or disconnected from the part to be extracted from or lowered into the well. The head 27 is provided with ratchet-teeth 3 1, adapted to be engaged by a dog or pawl 32, pivotally connected with an operating-lever 33, pivoted to oscillate upon a bracket 34, fastened to one of the side bars 15 of the derrick. By oscillating this lever 33 the dog or pawl 32 may be brought into engagement with the ratchet-teeth 31 to intermittently rotate the Windlass for the purpose of raising the grappling or extracting device from the well and elevating the same to adjust it for more convenient application to a rod, tube, or casing-section to be elevated.
A hoisting and lowering line 35 is fixed and wound at one end around the Windlass 25 and then passes therefrom upward along the upper side of the derrick and is passed around the supporting-pulley 21, and thence continues when the derrick is in operative position downward over the guide-pulley 11, whence its .free end projects downward in advance of the base-blocks 7 for attachment to the grapple or extracting device. To elevate the derrick for operative position, the grapple or extracting device is detached from the free end of the line and the latter made fast to the ring or fixture 24, whereupon by turning the wheel 25 in a forward direction the line will swing the derrick forward until it comes in contact with the cross-bar 10. After the derrick has been stayed by the attachment of guide-chains to the eyes 23 the free end of the line is disconnected from the fixture 24 and the grapple or extracting device applied thereto for use. To lower the derrick to the position shown in full lines in Fig. 2, the free end of the line is also attached to the fixture 24 and sufficient slack in the line allowed to permit the derrick to be pushed by hand backward beyond the perpendicular, so that it will swing by gravity to lowered position, its movement to such position being controlled by means of the band-brake. When the derrick is lowered, the apparatus may be tilted to a horizontal position by pulling down upon the top or free end of the derrick and a draft attachment suitably applied to said top end of the derrick to enable the device to be transported on the wheeled truckframe 1.
The parts are so constructed and proportioned that the weight of the frame, reel, and base portion of the derrick will be slightly greater than the upper portion thereof, which projects beyond the cross-bar 3 when the derrick is in lowered position, so that while the greater weight of the frame and base portion will elevate the top end of the derrick when the latter is detached from the draft-animals 8o 7 the parts will be so nearly balanced as to render it easy for the draft-team to support and haul the apparatus. The pulley 22 is provided to enable more than one hoisting and lowering line to be employed when an unusually heavy part or a number of-parts are to be elevated or lowered.
By the use of the crank 30 and the brake and ratchet operating mechanism the action of the Windlass may be readily and conven- 9o iently controlled to slacken or tighten the line for disengaging and engaging the grapple or extracting device from or with the joint of tubing or part to be elevated or lowered, and
the descent of the line with the attached extracting device into the well may be readily controlled by the action of the brake on the Windlass. The ratchet mechanism further adapts the Windlass to be operated manually for removing parts or a string of tubing from a well in order to permit the grapple or ex tracting device to be detached from the tube.
It will thus be seen that the apparatus may be conveniently controlled in use, may be operated manually or by horse or other power, and may also be conveniently transported from well to well for use. When the apparatus is set for operation, the weight of the derrick and load is supported by the baseblocks 7, and as the weight of the derrick is slightly more than counterbalanced by the weight of the truck-frame it will be understood that by the simple application of suitable guys or stays to the elevated derrick the latter will be firmly supported.
Having thus described the invention, what is claimed as new is 1. In an apparatus of the character described, the combination of a wheeled truck, a base, connections between the truck and base and forming therewith a supportingframe, a derrick pivotally mounted upon the base and adapted when raised to be supported by the base and frame and when lowered to rest upon the truck, and hoisting means mounted upon the derrick.
2. In an apparatus of the character described, the combination of a wheeled truck, a base, connections between the truck and base forming therewith a supporting-frame,
a derrick pivoted to the baseand adapted I 7 a base, upper and lower sets of bracing-bars,
said bars being fixed to the truck-frame and the forward ends of the lower sets of bars pivoted to the base, link-bars pivotally connected at their upper ends to the forward ends of the upper set of brace-bars, a derrick mounted on the base and pivotally connected to the lower ends of the link-bars, and hoisting and lowering means carried by the derrick.
4. In an apparatus of the character described, the combination of a wheeled truckframe, a base arranged in advance thereof, lower bracing-arms fixed at their rear ends to the truck and pivoted at their forward ends to the base, an upper set of bracing-arms pivoted at their rear ends to the truck and eX- tending forwardly at an upward inclination therefrom and connected by a cross-bar at their free ends, a derrick extending between said sets of bracing arms and pivotally mounted at its lower end upon the base, linkbars pivotally connected at their upper ends to the upper set of bracing-arms and at their lower ends to the derrick, and hoisting mechanism carried by the derrick.
5. In an apparatus of the character described, the combination of a supportingframe provided with supporting wheels at one end, a supporting-base at its opposite end, a derrick pivotally mounted upon the base and adapted to be supported by the frame in raised or lowered position, a Windlass carried by the derrick, a hoistingline connected with the Windlass and guided by the derrick and frame, means for connecting said line with the derrick to adapt the latter to be raised and lowered, and a brake carried by the derrick to regulate the movement of the Windlass and line to adapt the derrick to be lowered by gravity.
6. In an apparatus of the character. described, the combination of a wheeled supporting-frame having a base adapted to rest upon the ground when the device is in operative position, a derrick pivotally mounted upon said base, a Windlass carried by the derrick and provided with ratchet-teeth, an oscillating lever having a pawl to engage said ratchet-teeth, a brake-band for regulating the action of the Windlass, means for operating said brake-band, and a hoisting-line supported by the brake and connected with the Windlass.
7. In an apparatus of the character described, the combination of a wheeled truck, supporting means carried thereby, a derrick pivotally connected to said supporting means in advance of the truck to be raised for operation and to be lowered to rest upon the truck, and hoisting means upon the derrick.
8. In an apparatus of the character described, the combination of a wheeled truck, supporting means carried thereby, a derrick pivoted to said supporting means in advance of the truck to be raised for operation and to be lowered to rest upon the truck, the construction being such that when the derrick is lowered said derrick may be tilted on the truck to a horizontal position for transportation, hoisting means on the derrick, and means for utilizing said hoisting means to raise and lower the derrick.
In testimony whereof we afiix our signatures in presence of two witnesses.
JAMES ONEILL BRUEN. WILLIAM AOKERMAN.
Witnesses: I
EUGENE B. LAWSEN, BEN. J. SCOVILLE.
US29657206A 1906-01-17 1906-01-17 Apparatus for extracting and applying well-tubing, &c. Expired - Lifetime US828708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US29657206A US828708A (en) 1906-01-17 1906-01-17 Apparatus for extracting and applying well-tubing, &c.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US29657206A US828708A (en) 1906-01-17 1906-01-17 Apparatus for extracting and applying well-tubing, &c.

Publications (1)

Publication Number Publication Date
US828708A true US828708A (en) 1906-08-14

Family

ID=2897184

Family Applications (1)

Application Number Title Priority Date Filing Date
US29657206A Expired - Lifetime US828708A (en) 1906-01-17 1906-01-17 Apparatus for extracting and applying well-tubing, &c.

Country Status (1)

Country Link
US (1) US828708A (en)

Similar Documents

Publication Publication Date Title
US588982A (en) Scaffold
US828708A (en) Apparatus for extracting and applying well-tubing, &c.
US4188997A (en) Well pump service
US801372A (en) Oil-well derrick.
US807861A (en) Rig for oil-wells.
US450695A (en) Derrick
US701975A (en) Derrick.
US784586A (en) Hoisting device.
US808632A (en) Hoisting-machine.
US506967A (en) George w
US1152232A (en) Stump-puller.
US1632935A (en) Oil-well utility gin pole
US836984A (en) Well-drilling machinery.
US767135A (en) Hoisting mechanism for sucker-rods, &c.
US296915A (en) Stump-puller
US2706540A (en) Folding gin pole for oil well mast
US1615657A (en) Derrick safety cage
US776657A (en) Portable derrick.
US951621A (en) Pipe-pulling machine.
US372147A (en) Stacker
US148364A (en) Improvement in fire-escapes
US366740A (en) Son geost sandees
US848231A (en) Grapple.
US900433A (en) Land-clearing machine.
US437088A (en) Hoisting device