US701019A - Coupling for pipes, &c. - Google Patents

Description

N0. 70!,0I9. Patented May 27, I902.

S. E. DIESCHER.

COUPLING FOR PIPES, 8w.

(Application filed Oct. 21, 1901.}

(No Model.)

m: "cams wsrzns co. PHOTO-UTRQ, \VASHINGYON u c hrnrns Fitment fiss on.

SAMUEL E. DIESCIIER, OF PITTSB'URG, PENNSYLVANIA.

COUPUNG FOR PIPES, 3pc.

SPECIFIGATEON forming part of Letters Patent No. 701,019, dated May 27, 1902. Application filed October 21, 1901. Serial Ilo. 79, l07. (ll'o model.)

' Pennsylvania, have invented or discovered certain new and useful Improvements in Couplings for Pipes, &c., of which improvements the following is a specification.

The invention described herein relates to certain improvements in couplings of the class or type forming the subjects-matter of Letters Patent Nos. 631,956 and 631,957, dated August 29, 1899, and consisting, generally stated, in gripping coils and an inclosing case or shell.

two coils 1, having oppositepitches and l1avin g an internal diameter approximately equal to the external diameter of the pipe-sections 2 to be connected. The coils have their outer surfaces tapering from the outer to their innor ends, corresponding to the internal taper of the inclosing case or shell 3. The coils are externally threaded, the threads on each coil having-a pitch opposite the pitch of the coils themselves, and the case or shell is internally threaded, the pitch of the threads at one end right-handed and at the opposite end left handed.

In making a connection between pipe-sections the coils are slipped onto the ends of the pi pe-sections,wl1ich they should fit snugly by preference. The ends of the coils and pipes are then inserted into the ends of the case or shell and the latter rotated, so as to draw the coils and pipe ends into the case or shell. While the case or shell is rotated on the coils the latter and the pipe'scctions are ployed for holding the pipe-sections.

The present invention has for its object a held stationary. This can be conveniently effected by forming lugs 4 on the outer or larger ends of the coils, said lugs being adaptedto engage the pipetongs or other tool em As the threads on the coils have a pitch opposite that of the pitch of the coils, it is obvious that in turning the case or shell in the direction of the arrow at to screw it onto the coils the case or shell will have a tendency to pull with it the front or inner ends of the coils as soon as it is in frictional engagement with such ends, and thereby tighten the coils onto the pipesections. The tighteningof the coils is also effected by the circumferential. pressure applied to the coils as they pass into the case or shell. As the coils are made to fit the pipe snugly, only a partial turn of the case or shell will be needed to cause the coils to take a firm grip on the pipe-section, so that by the continued rotation of the case or shell the ends of the pipe-sections will be drawn toward each other and against a suitable packing-ring 5, interposed between the adjacent ends of the pipe-sections. In order to prevent the pack ing from being squeezed out into the space between the case or'shell and the pipe-sections, a backing or reinforcement (5 for the packing-ring is provided. As shown in Fig. 1, the backing or reinforcement may be formed integral with the packing-ring or may be formed in or secured to the case or shell, as shown at 6 in Fig. 3. In the latter case the backing or reinforcement is provided with a groove to hold the packing in position.

As shown in Fig. 2, my improved coupling canbe employed for connecting the adjacent ends of shafts 7. The construction and mannor of applying the coupling to shafts is simi-a lar to that described except that no packing is employed.

While the construction shown in Figs. 1 and 2 is efficient as regards its coupling or connecting function, difficulty is experienced in I uncoupling, especially when the parts have been brought together tightly, for the reason that in turning the caseor shell oack there will be a tendency on the part of the case or shell to push back the inner ends of the coils and to cause an expansion thereof against the case or shell and to prevent the latter turning back on the coils. This objectiom able feature can, however, be obviated by making the threads on the coils with a pitch v inthe same direction as that of the coils themselves, as shown in Fig. 3. When the case or shell is screwed onto the coils, there will be a tendency to push the front or inner ends of'the coils back or in a direction. to enlarge the coils. In order to prevent any such back or enlarging movement of the inner ends of the coils, they are made of such internal diameter that theinner coils will grip the inner ends of the pipe-sections firmly when pushed into the coils. This frictional grip will be sufiicient ordinarily to hold the coils on the pipes, but may be rendered more certain by roughening the internal surfaces of the inner ends of the coils. When the inner ends of the coils are thus held, the coils will be caused to grip the pipe-sections by the circumferential pressure of the case or shell, the outer ends of the coils being forward; This forward movement of the coils around will be assisted by the friction between the coils and the case or shell. It is found in practice that in this construction the grip on the pipes is as elfectual as in the construction shown in Figs. 1 and 2 and that the joint thus formed can be loosened by turning the case or shell back, there being no gripping of the coils against the case orshell during such back movement.

I claim herein as my invention- 1. A coupling for pipes, 850., having in combination two coils externally tapered and threaded and a case or shell internally iapered in opposite directions and threaded to correspond to the threads on the coils, substantially as set forth.

2. A coupling for pipes, 850., havingin combination two coils of opposite pitch externally tapered and having external right and left threads and a case or shell internally tapering in opposite directions and internally threaded to correspond with the threads on the coils, substantially as set forth.

3. A coupling for pipes, &c., having in combination two coils of opposite pitch externally tapered, and having external right and left threads, means for locking one end of each coil to the pipe, 850., and a case or shell internally tapering, in opposite directions and internally threaded to correspond to the threads on the coils, substantially as set forth.

4. A coupling for pipes, the. having in combination two coils of opposite pitch externally tapered and having external threads pitched in the same direction as the coils and a case or shell internally tapering in opposite directions and threaded to correspond with the threads on the coils, substantially as set forth.

In testimony whereof I have hereunto set my hand.

SAMUEL E. DIESGIIER.

Witnesses:

DAR'WIN S. WoLoorT, F. E. GAITHER.

Images