US578388A

US578388A - David w

Info

Publication number: US578388A
Authority: US
Publication date: 1897-03-09
Anticipated expiration: 1914-03-09

Description

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Patented Mar. 9, 1897.

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UNiTED STATES PATinwr OFFICE.

DAVID IV. BLACK, OF BUTLER, PENNSYLVANIA, ASSIGNOR TO BENJAMIN MASSETH, OF SAME PLACE.

PACKER.

SPECIFICATION forming part of Letters Patent No. 578,388, dated March 9, 1897.

Application led May 2, 1896. Serial No. 589,977. (No model.)

Be it known that I, DAVID W. BLACK, of Butler, in the county of Butler and State of Pennsylvania, have invented a'new and useful Improvement in Packers, of which the following is a full, clear, and exact description, reference being had to the accompanyingdrawings, forming part of this specification, in which- Figure l is a side elevation of a packer provided with my improved lock and inserted in the well, but as yet unpacked. Fig. 2 is a vertical section of the same. Figs. 3 and 4 are similar views to Figs. l and 2, respectively, but showing the lock broken and the packer expanded. Fig. 5 is a cross-section on the line V V of Fig. l. Fig. 6 is va perspective View of one form of my improved lock. Fig. 7 is a side elevation of the s'ame as fractured to unlock the packer, and Fig. 8 is a perspective view of another form of my lock. My invention relates to that class of expansible packers for deep wells wherein a lock is employed to hold the spring which acts upon the slips or arms and is designed to provide an improved construction of the lock,whereby its action is made positive and certain.

It consists in al lock of this character which is arranged to bend downwardly in its intermediate port-ion when struck by the weight, thus insuring the withdrawing of its ends from the holes in the casing.

In the drawings, in which similar characters indicate corresponding parts, 2 represents a portion of the well-casing, and 3 the eXpansible packing-tube, made, preferably, of rubber, which ts around the casing and bears at one end against a shoulder a, formed, preferably, by a coupling-sleeve4 on the casing. At its otherend the packer bears against a shoulder b, formed, preferably, by the end of a tubular, conical, or wedge-shaped section 5, which surrounds and slides loosely upon the casing.

6 is a collar or band which encircles the casing below the section 5 and is provided with upwardly-projectin gsprin g arms or slips 7, arranged to wedge between the tapered s urface of the cone 5 and the sides of the well. 5o

A spiral spring S encircles the casing below the band 6 and bearing upon a lower sleeve 9, secured to the casing, acts to force the collar or band 6 upwardly. The spring is normally held compressed by a lock or cross bar l0, which projects through holes in the sides of the casing and engages the collar 6, thus preventing its upward movement, this lock being broken after the packer is lowered to the desired point by a weight dropped into 6o the top of the casing. This locking-bar constitutes the feature of my invention, which consists in forming it with an intermediate bending portion instead of cast-iron or some easily-broken metal, as formerly. Thus in the form of Figs. 2, 5, and 6 I cast a disk 11, having projecting arms 12, this disk being weakened by a slot 13. Crossing this slot and cast into the disk is a flexible wire 14, which, when the weight strikes the lock, will 7o bend downwardly, causing the arms l2 to be drawn out of the holes in the casing, the lock assuming the shape of Fig. 7..

In Fig. 8 I show another form of my lock, which is made of wrought-iron, the central '75 portion 1l', having arms 12' and being slotted inwardly at 13', leaving a connecting-neck 14', which will bend in the same manner as the wire of the iirst form.

The advantages of my invention will be 8o appreciated by those skilled in the art, since the unlocking of the packer is made positive and uniformly certain, the armsrbeing positively drawn from the holes in every case..

Many changes may be made in the material employed'and the form of the lock Without departing from my invention, since I consider myself the first to employ a lock of this character having an intermediate bending or flexible portion.

I claim- 1. A lock for oil-well packers, consisting of a body portion having arms arranged to project through slots in the packer, said body ened portion and Connect-ing the parts on 1o each side thereof; substantially as described.

In testimony whereof I have hereunto set my hand.

DAVID W. BLACK.

Witnesses:

ALEX. MITCHELL, ANDREW G. WILLIAMS.