US 746378 A
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No. 746,378. PATENTED DEC. a, 1903.
0. H. REDFIELD. PROTECTIVE COVERING FOR DRIVE WELL POINTS.
APPLIOATION FILED SEPT. 26, 1903.
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Patented December 8, 1903.
CHARLES H. REDFIELD, OF WEST HAMPTON BEACH, NEW YORK.
PROTECTIVE COVERING FOR DRIVE-WELL POINTS.
SPECIFICATION forming part of Letters Patent No. 746,378 dated December 8, 1903. Application filed September 26.1903. Serial No. 174,808. on model.)
York, have invented a new and useful Improvement in Protective Coverings for Drive- WVell Points, of which the followingis a specification.
The invention relates to drive-well points; and it consists in a protective covering for the strainers thereof.
The object of the invention is to prevent the perforated-metal and wire-gauze strainers which inclose the perforated pipe-section carrying the point proper from being torn and rolled back during the well-driving operation.
In the accompanying drawings, Figure 1 represents a drive-Well point without my protective covering. Fig. 2 shows my protective covering separately. Fig. 3 shows a drivewell pointwith my protective covering in place thereon, the strainers being broken away to show the position of the openings 2 with respect to the slots 9 in the covering 8. Fig. 4 is an enlarged cross-section on the line 00 00 of Fig. 3. I
Similar numbers of reference indicate like parts.
Referring fi rst to Fig. 1, the drive-well point as here shown consists of a pipe-section 1 having in its wall longitudinal rows of large openings 2 and provided at one end with the point proper, 3, and threaded at the other end to receive the well-pipe 4. The section 1 is covered with an inner strainer of fine-wire gauze 5 and an outer strainer of perforated sheet metal 6, secured to the section at their ends by solder or other suitable means. The flange 7 of the point 3 protrudes beyond the surface of the strainer 6.
I have found as the result of extended practice in driving these points that the strainers become easily injured by stones and similar hard bodies engaging with themas the point is forced downward and tearing them free from their lower attachment. This often happens even when the stone is pushed aside by the point-flange 7, since it tends to fall or spring back again into contact with said outer strainer after the flange has passed it. When the lower attachment of the strainers 5 and 6 is broken, both strainers crumple upward as the pipe descends, thus exposing the large openings 2, and said openings remain thus unprotected when the point reaches its final position. The consequence is that the pump draws sand readily through said large openings and the well pipe speedily becomes choked and useless. It is then necessary to withdraw the whole point, which because of the injury is practically ruined, and substitute another,and this obviously involves much loss of time and material and hence expense.
My present invention obviates the foregoing difficulty.
It consists in a protective sleeve or cover- I ing 8, (shown separately in Fig 2,) which may be easily made from a pipe-section of suitable size and preferably of the same thickness as the well-pipe 4. Said covering incloses the outer strainer 6 of the drive-well point and has in its wall elongated slots 9, which when said covering is in place, as shown in Fig. 3, register with the rows of large openings 2. Hence the flow of water into the pipe-section 1 is not impeded. The covering bears at its lower end upon the point-flange 7 and is secured in place by the well-pipe 4, which comes in contact with its upper end. The covering is prevented from rotating by a pin 10 entering the pipe-section 1 or by any other suitable means. It will thus be seen that my covering may be easily secured to the drive-well point without the aid of special fastening devices and may be removed therefrom when desired.
I claim-- 1. As a new article of manufacture, a pro tective covering for drive-well points, consisting in a tubular sleeve of rigid metal having elongated openings in its wall.
' 2. In combination with a drive-well point having rows of openings in the wall of its pipesection and a strainer covering said openings, an external tubular sleeve of rigid metal having slots in its wall registering with said rows of openings.
p 3. In combination with a drive-well point having rows of openings in the wall of its pipesection and a strainer covering said openings,
an external tubular sleeve of rigid metal hav- Q I meme ing slots in its Wall registering with said rows slots in its Wall registering with said rows of openings and means for detachably securand constructed to be received between the ing said sleeve upon said pipe-section. end of said well-pipe and said point-flange.
4. The combinationwith a drive-Well point In testimony whereof I have signed my 5 comprising a pipe section having rows of name to this specification in the presence of 15 openings in its Wall, a flanged point carried two subscribing Witnesses.
by said section, a threaded connection for CHARLES H. REDFIELD. the Well-pipe at the other end of said section Witnesses:
. and strainers covering said openings, of an I. A. VAN WART,
to external tubular sleeve of rigid metal having J. LOESCH.