Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS827835 A
Publication typeGrant
Publication dateAug 7, 1906
Filing dateNov 17, 1904
Priority dateNov 17, 1904
Publication numberUS 827835 A, US 827835A, US-A-827835, US827835 A, US827835A
InventorsJohn H White
Original AssigneeBell Malcomson A, John H White
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Gas-main bag.
US 827835 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

No. 827,835. PATENTED AUG. 7, 1906.

' J. H. WHITE.



3 sums-SEEM 1.

THI mums rxrsns 270., wunmoron, n. c.

No- 827,835., PATENTED'AUG. v, 1906. J. H. WHITE.



3 BHEE'lS--SHHl-I'J.v 2;

. I 4. 951 mom w vtwaooco No- 827,835. 'PATENTED AUG. 7, 1906.

' -J. H. WHITE.




IIIIIIIIIIIIIIIIImIIII/[III!!!4 avwentoz 3513 Qttozmq @Vdmeooeo @wm UNITED sTATEs PATENT OFFICE...



Specification of Letters Patent.

Patented-Aug. 7, 1-396;

Application filed November 1'7, 1904. Serial lilo. 233.065.

. tion of a main, it is the practice to make two small erforations in the main at points each side of the vicinity of the leak and through these holes to insert expansible plugs, which when expanded fill the main at these separated points and cut off the gas. Then by suitable apparatus it is ascertained whether the leak is in the portion of the main between thse perforations. Temporary plugs or stoppers are used also upon other occasions. Usually the plug is in the form of a bladder made of rubber, which may be thrust readily through the small perforation in the main and by means of an attached tube is expanded by the workman, who blows through the tube and fills the bag. Owing to the inevitable escape of gas through the perforation in the main, which of course is breathed by the workman, the operation of placing and expanding the bladder is quite dangerous, workmen frequently being overcome by the fumes and taken to hospitals to recover. The danger is increased by reason of the pressure or flow of the gas in the main, which when the bladder is partly full floats it alongwith the current of gas and carries it past the perforation in the main. This makes it necessary to find means to work the bladder back past the perforation, which is usually done by the use of short sticks or the like; but the management of the bladder during [the inflation thereof is exceedingly difficult and the operation tedious, and during the whole time the workman or workmen are exposed to the necessity of inhaling the escaping gas.

The object of my invention is to put the bladder fully under the control of the workman and render it perfectly manageable throughout the inflating operation, so that the workman can approach the main with the bladder, instantly insert the bladder through the perforation and in the proper position in the gas-main in advance of the perforation, and quickly inflate the bag without the least liability of the displacement or floating of the bladder along by the current of gas in the main and avoiding danger from overinhalation of gas.

I control the bladder by means of a stock inserted therewithin and preferably having an exterior extension or handle which is readily removable from the stock as occasion may arise. By means of the stock the workman can readily maintain absolute control of the position of the bladder and without the necessity of attempting to, peer into the main to locate the blad'der,the position of the portion of the stock or handle that projects. from the main being sufficient to inform him precisely of the position of the bladder, supplemented by the information afforded by the interior end of the stock encountering the obstruction of the inner wall of the main.

In the accompanying drawings, Fiure l is a perspective view of one form of temporary plug made in accordance with my invention,

the bladder being shown deflated. Fig. 2 isa sectional view showing a gas-main perforated and plugged by the device seen at Fig. 1. Fig. 3 is a sectional view of another form of the invention. Fig. 4 is a sectional view showing another form of inflating means. In both Figs. 3 and 4 the bladder is shown deflated. Fig. 5 shows the preferred form v of the invention. Fig. 6 illustrates the preferred manner of connecting the stock to the bladder. Fig. 7 shows the bladder when wrapped around the stock ready for insertion into the gas-main. Fig. 8 showsthe device when first inserted in the main, and Fig. 9 shows the bag after inflation in the main and adjustment of the testing-tube,

Referring to Figs. 1 and 2, the thin elastic rubber bag or bladder is seen at 1, the interior or axial stock at 2, and the flexible infla-t-' ing-tube at 3. At its upper end the stock is threaded at 4 to receive interior and exterior nuts 5 6, whereby the material of the bladder is tightly clamped, so as to renderthe same air-tight, washers 7 8 being placed between the nuts and the bladder through a small perforation in which the stock projects. Ifdesired, the bottom end of the stock may proj ect through the bladder and be secured thereto in a similar manner by nuts 9 10 and washers 11 12. The tube 3 may be of rubber and inserted within and cemented to a nipple 13, formed in the bladder near the stock.

The nut or head 6 may be prolonged or sleeve-like in form, and the threaded tip of a long handle 14 may be screwed thereinto and readily detached and attached, as required.

In operation the thin and flexible material of the bladder is wrapped around the stock, as shown in Fig. 7, which is then thrust readily through the perforation 15 in the gas-main 16, and by giving the handle the proper inclination and thrusting it in until it contacts with the bottom interior wall of the gas-main the proper position is given to'the bladder,

'3 which is then filled by the workman through the tube 3 and caused to fill the gas-main tightly, the portion of the bladder which contacts with the wall of the gas-main assuming a cylindrical form, as seen at 17, the end of the stock because of its inclination being outside of this cylindrical portion, and hence having no tendency to impair the efficiency of the plug by holding the adjoining portion of the bladder out of contact with the bottom of the main. The tube 3 is then temporarily sealed either by tying a knot in it or by tying it up with a string. The handle 14 may then be unscrewed without disturbing the plug, (although for some purposes it is unnecessary to removethe handle,) and a short pipe 18 may be screwed into the perforation 15, which is threaded for this purpose. This I pipe, which is indicated in dotted lines in Fig. 2, is a portion of the apparatus used for testing the main for a leak and need not be further described but it will be noted that preferably provided with a knob 20 within said pocket. This avoids the necessity of perforating this end of the bladder, thus reducing cost and avoiding liability of leakage, so that if the stock is suficiently long to 3 maintain the bladder in the desired position during its inflation it will be found satisfactory in practice. I prefer to make the stock extend practically the entire length of the bladder; but the invention is not limited to a stock of that length.

The form of the invention seen at Fig. 4 is the same as that shown at Figs. 1 and 2, except as to the inflating means. The stock is made in the form of a tube 21, having outlets 22, and the bladder is inflated through this tube and these outlets. The rubber tube 3 instead of being attached directly to the bladder is caught upon a nipple 23', projecting from the threaded sleeve or head 24, which corresponds to the part 6 seen at Fig. 2, an elbow-passage 25 in said member 24 establishing communication between the tube 3 and the end of the tubular stock 21. The member 24 is in the form of a T, receiving at one end the threaded end of the stock and at the other end the threaded end of the handle 14 but the stocket for the handle is closed at the bottom by a partition 26 to avoid liability of leakage through said socket. It will be apparent that the member 24 may be cast or made in one piece with the stock 2, and it is immaterial whether the stock joins the member 24 on the interior or exterior of the since the air enters through the stock.

In the form seen at Fig. 5 the stock is in the form of a perforated tube for the passage of air and is provided at its lower end with a cap 27, having a knob portion 20 to engage the pocket 19, although the cap, knob, and pocket are not essential in all forms of practicing the invention The wall of the bladder is preferably thickened or reinforced at the lower end of the same, as seen at 28, to compensate for the extra wear received by this end as the device is thrust into and against the Wall of the gas-main. The threaded sleeve or head at the top of the bag is designated as 29 and resembles the head 24, (seen at Fig. 4,) except that the nipple 30 is at the top and close'by the side of the handle 14, thus making the construction more compact, so that it can be readily thrust through a relatively small perforation 15 in the gas-main. The passage 31 extends down to the hollow stock, which is preferably in line with the handle 14.

At Fig. 6 is illustrated the preferred method of securing the stock to the bladder, the perforation 32 in the latter being made at the center of a thickened portion 33 of the rubber and surrounded by an annular bead 34, fitting in an annular depression 35 in a nut 36, threaded upon the stock. By turning the head 29 the rubber is clamped between the washer 8 and the nut 36, and the bead 34 serves to retainthe rubber, so that it will not slip out between the nut and the washer.

Other variations may be resorted to within the scope of the invention, and portions of my improved device may be used Without others.

' It will be observed that my invention involves the use of a flexible bladder as distinguished from a firm hollow rubber ball used as a stopper to be inserted in the open end of a pipe and then distended. In the latter case astifl, thick, resilient rubber ball with a diameter equal to or slightly smaller than the bore of the pipe is used.

In my invention the bladder is of thin ma terial which has no resiliency and is limp and flabby and without form when not inflated, so that it lies against and may be wrapped closely around an interior guiding stock and readily passed through a comparatively small hole in the wall of the gas-main. The device should also be of such construction that substantially all of the plugging and inflating portions may lie within the circumference of the gas-main or be housed within the upright tube 18 when the main is being tested. This latter object I accomplish by having the stock controlled, while inserting the bladder, by an exterior handle 14, which is readily removed from interference with the adjustment of the test-tube 18 after the bladder is properly inserted and inflated, while the flexible inflating-tube 3 is housed inside the tube 18, as shown in Fig. 9.

In practice I prefer to have one end of the rigid guiding-stock terminate inside the blad-- der, so that there is greater security against leakage or wear and tear from an additional hole at the far end of the bladder; but I do not wish to limit myself to such a construction, as my invention comprehends the use of a collapsible non-resilient bladder with a rigid interior guiding-stock around which the comparatively thin bladder is closely wrapped which permits of its being readily passed obliquely into a gas-main through a comparatively small hole in the side of the pipe and held in such position by an outer handle during the operation of inflation.

It will be apparent that my improved con-.

struction enables the operator to readily comply. with municipal regulations which limit to a comparatively small size holes to be tapped in gas-mains in order not to weaken such mains. At the same time the rigid central stock and handle permit the operator to hold a cloth or cotton-waste firmly around the stock at the hole, and thereby prevent the escape of gas while he is adjusting and inflating the bladder.

By the term bladder as used by me in this specification is meant an air-tight bag which will lie limply around the interior rigid guiding-stock when not expanded by the pressure of air on its interior. The material of which the bladder is composed is immaterial so long at it complies with the necessary requirements of being air-tight and capable of being folded into small compass around an interior stock.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A temporary plug for gas-mains comprising a central rigid stock, a non-resilient collapsible. bladder adapted to be wound closely around the stock, the major portion of said rigid stock beingwithin the bladder, means for inflating the bladder and a rigid controlling handle-piece for the stock, exterior of the bladder, substantially as shown and described.

2. A temporary plug for gas-mains comprising a collapsible bladder, a hollow stock having air-outlets within said bladder and carrying a cap-piece, exterior of the bladder, for attaching an inflatin -tube and a controlling-handle, substantial y as shown and described.

3. A temporary plug for gas-mains, comprising a non-resilient collapsible bladder, a rigid guiding-stock penetrating said bladder at one end extending through the interior thereof and terminating therein, said stock being provided with a detachable handle, and means for inflating the bladder substantially as shown and described.

4. A temporary plug for gas-mains comprising a non-resilient, collapsible bladder, a hollow perforated rigid guiding-stock penetrating said bladder at one end and terminating therein at or near the opposite end thereof, and means connected with said hollow perforated stock for inflating the bladder therethrough substantially as shown and described.

5. In a temporary plug for gas-mains, the.

combination with a non-resilient flexible bag, of a rigid guiding-stock therein which passes through the wall of the bag and is secured thereto at another point, means for securing the bag close to said stock at said points without rigid lateral projections such as to prevent close wrapping of the bag upon the stock, and means for inflating the bag, whereby said bag may be inserted through a small opening and guided to and held in proper position in the gas-main, substantially as shown and described.

6. A temporary plug for gas-mains, comprising a collapsible bladder, a hollow stock therein, said stock terminating at one end within and close to the exterior of said bladder, and at the other end passing through said bladder and provided with means for attaching a handle, and a flexible inflating tube, exterior of the bladder, substantially as shown and described.

7. A temporary plug for gas-mains, comprising a bladder, a stock therein, and means for inflating the same; said bladder having at one end a pocket, and said stock penetrating said bladder at the other end of the latter and being secured thereto, and having at its inner end a knob within said pocket.

8. A temporary plug for gas-mains, comprisin a bladder, a stock therein, and a flexible in atin '-tube; said stock penetrating one end of the ladder, clamping means makin an air-tight connection between the bladder and the stock, and the inner end of the stock being provided with a knob.

9. A temporary plug for gas-mains, comprising a collapsible bladder, a stock therein, and an inflating-tube; said stock extending substantially from one end of the bladder to the other, and terminating therein, and one of the said bladder and stock elements hav ing provision for the attachment of said inflating-tube.

10. A temporary plug for gas-mains, comprising a collapsible bladder, adapted to be closely wrapped around a guiding-rod for placing the same in the main, said placingrod being composed of a rigid stock within the bladder, and means for inflating the bladder when within the main substantially as described.

11. For use in a gas-main bag of the class described, a rigid stock having one end formed to terminate within and engage the interior of the bladder and provided with means at its outer end to pass through and make an air-tight connection with said bladder substantially as shown and described.

12. For use in a gas-main bag of the class described a rigid guiding-stock its major portion formed to lie in the interior of said bag, the remaining portion formed to project through the bag and make an air-tight connection therewith and provided with means for attaching a rigid controlling-rod on its exterior portion, substantially as shown and described. 13. A gas-main-bag stock, comprising a rigid bar ending at one end in a button and at the other end in a threaded part and flanges adapted to receive and clamp an air-tight collapsible bladder, and provided with means for attaching a handle and an inflating-tube exterior of the bladder substantia ly as shown and described.

' JOHN H. WHITE. Witnesses:

M. M. AoHEsoN,


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3276481 *Aug 13, 1964Oct 4, 1966Mcnulty Carrell SApparatus for controlling liquid flow
US3841355 *Jun 16, 1972Oct 15, 1974Laner GPipe plugging tool
US4203473 *Apr 26, 1978May 20, 1980Roberson Walter HClosure plug assembly
US4398565 *Aug 21, 1981Aug 16, 1983Williamson Geronimo CPipe plugging apparatus
US4627470 *Jun 1, 1984Dec 9, 1986Alh Systems LimitedSealing ducts
US4883094 *May 11, 1988Nov 28, 1989Manfred VetterApparatus for sealing pipe
US20050000593 *Jul 14, 2004Jan 6, 2005Ariel ShaltielPlumber's tool
Cooperative ClassificationF16L55/134