US1622043A - Expansible packer for plungers - Google Patents

Description

Maid, 22, 1921. 1,622,043

E. E. MILLER EXPANSIBLE PACKER FOR PLUNGBRS Filed June 12, 1925 Patented Mar. 22, 1927.

nawm mam- .1a er summatio CALIFORNIA.

EXPQNSIFQE13433133301535-.YLQHGEWS! Application med-111M 12, 1925. Serial No. 36,672. 5; J' il:] ugrmi This invention relates to iinqarovihents in plungers for pumps andth'el ke. I

An obj ect' of the invention- "is to prov de a plunger'having a'pliiliger 'rodpnfwh chtwo heads "are mounted, and between which heads there is arranged an expihsible-packing adapted to be expanded the fluid pressure. U

Another object of the inventionis to provide a sealing inean's for pievent'ing the leakage of fluid btftiVBIltlhQjl'litdS? Ain'rtthefobjdt of the intention s to provide pump p un er having a p-21 oi heads between which arranger fan: exp ain siblep'ac'ki-ng adapted 'to be expanded hyfthe flnidpressure, and to provide a separate means for closing the passages which admit the fluid pressure to the space between the heads and the expansible packing;

WVith' t-he foregOin'ghncPot'her objects H1 view which will be hiade'manifest intihe following detailed description and sfpe c i fi ca'lly pointed out ela ms, reference is had to'the'accompanying drawings for an illustrative embodiment of the invention, wherein:

Figure 1 is a vertical section through a pump barrel or cylinder and through the plunger of the improved construction disposed therein,

Fig. 2 is a side elevation of the improved plunger,

Fig. 3 is an end elevation of the plunger and may be considered as taken in the direction of the arrow 3 upon Fig. 2,

Fig. 4. is a perspective view of one of the heads, I

Fig. 5 is a perspective view of the expansible packing, and

Fig. 6 is a perspective view of the sealing lgeferring to the accompanying drawings wherein similar reference characters" deslgnate similar parts throughout, the plunger consists of a plunger rod 10 which is tapered, as indicated at 11, and which is provided with a cylindrical threaded end 12. Heads 13 and 14 are arranged upon the plunger rod and have projecting hubs 15 and 16 which abut each other. The heads are maintained upon the plunger rod 10 by means of a nut 17 and a lock nut 18. On the opposed faces of the heads 13 and 14 there are formed annular shoulders 19 and 20. The expansible packing 21, which may be formed of soft, flexible rubber or equivalent *in aterial, disposed between the heads and lies its'lendportions engageable upon and arranged about'the annular shoulders 19 and E20." Apertures 22 are formed longitudinally througlifithe "heads between the hubs 15f andltiand their respective shoulclers19endi'2t).* A sealing ring 23'is dis posed'ahout" the hubs "15 and '16 and has ou tward l y'extend-in g flanges Q/l -which bear against the opposed faees' f the heads'13 and '14. The sealing ring ispreferably seemeder soft, flesjitle rather orequivalent material, and its flanges 24, becauseof their resiliency,act as check Valves GLClOSHll-ES for the inner ends ofthe apertures 22.

"The operation ofthe pl nger is as follo WsFUpOI-i reci 'g'rocation fof the plunger, the fluidpressur-e within thebarrel or cylin d-er of th epum-p enters through the aper+ tlures 22, and escapes past the flanges '24 on the sealing ring 23, lilling the chamber" 525 and thus expanding the expansible packing 21. against theinterim-surfaces of the barrel. 'The sealihg' 23 prevents) leakage of fluidhetiveeii-the dbutt'ingsurfaces on the hubs 15 and 16, and as it is detached from the expansible packing, any movement of the flanges 24, in opening or closing the apertures 22 in no way interferes with or influences the expansible packing. WVhen the packing 21 is slightly expanded, its end portions will disengage from the exterior surfaces of the shoulders 19 and 20, so that the pressure within the chamber 25 is applied between the shoulders and the packing. This causes the end portions of the expansible packing to bear or expand against the interior surfaces of the pump barrel or cylind-er with as great a force as that which is applied at the center of the expansible packmg. This is an important feature on plun ers of this type for the reason that the outer edges of the expansibl-e packing become chipped and chewed up so that after the packing has been slightly worn, it is diflicult to make the end portions of the packing fit snugly against the interior of the barrel. The pressure beneath the end portions of the packing maintains these portions in their expanded or bearing positions.

It will be readily appreciated that this form of plunger can be easily and quickly constructed, the packing 21 being shown merely in the form of a cylindrical ring which can be easily molded. Although the packing 21 is illustrated as being in the form of a smooth ring, it can be modified if so desired.

It will be understood that various changes in the detail of construction may be made without departing from the spirit or scope of the invention as defined by the appended claims.

I claim:

1. A pump plunger comprising a plunger rod, means providing heads upon the rod, an expansible packing arranged between the heads, means providing passages through which fluid may be admitted between the heads to expand the packing, and a separate ring detached from the packing and spaced therefrom disposed between the heads, said ring having flange portions serving as closures for the passages.

2. A pump plunger comprising plunger rod, means providing heads upon the rod, an expansible packing disposed between the heads, a sealing ring disposed between .the heads, and means providing passages through the heads through which fluid pressure may enter the space between the heads to expand the packing, said sealing ring serving to prevent leakage between the heads and having outwardly extending flanges adapted to close said passages.

3. A plunger for pumps and the like comprising a plunger rod, means providing heads upon the plunger rod having annular shoulders formedon their opposed faces,

an expansible packing disposed between the heads having end portlons engageable upon the shoulders, means providlng passages whereby fluid pressure'n'iay be admitted to the space between the heads, and means providing closures for said passages.

4. A plunger for pumps and the like com prising a plunger rod, means providing heads upon the plunger rod having annular shoulders formed on their opposed faces, an expansible packing disposed between the heads having end portions engageable upon the shoulders, means providing passages whereby fluid pressure may be admitted to the space between the heads, and a sealing ring disposed between the heads for preventing leakage therebetween, said sealing ring having outwardly extendingflanges adapted to close said passages.

5. A pump plunger comprising a plunger rod, heads mounted upon the rod having abutting hubs and having annular shoulders formed upon their opposed faces, a sealing ring disposed about the abutting hubs preventing leakage therebetween, an expansible packing disposed between the heads having end portions engageable upon the shoulders, there being passages formed through the heads, and flanges upon the sealing ring adapted to close said passages.

In testimony whereof I have signed my name to this specification.

ERWIN E. MILLER.

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