US2666394A - Pump construction - Google Patents

Description

Jan. 19, 1954 H. J. SADLER ETAL PUMP CONSTRUCTION Filed Oct. 27. 1952 INVENTORS hWIPF) d SflDLf/Q ATTORNEYS P tented Jan. 19, 1954 PUMP CONSTRUCTION Harry J. Sadler and Ernest E. Cook, Minneapolis, Minn.

' Application October 27, 1952, Serial No. 316,992

ticularly .to improvements in relatively small high-pressure 'fiuid pumps.

The primary object of our invention is the provision of novel means for automatically disconnecting therdriving means for my novel pump from the drive shaft and the rotary impeller carried therebywhen said impeller is caused to bind due to frictional engagement with the housing, breakage, wear, or other conditions brought about by use. In this manner, more extensive damage to the impeller and pump housing is prevented.

-A still further object of our invention is the I -'.l?refe'rably and as shown, an annular convenprovision of a device of the type immediately above described, wherein the driving head for, the pump may be quickly and easily operatively reconnected to the drive shaft and impeller after the same have been disconnected due to the unusual conditions above described.

A still further object of our invention is the provision of a device of the class described which is inexpensive to produce and extremely foolproof and durable.

The above and. still further objects of our invention will become apparent from the following detailed specification, appended claims and attached drawings.

Referring to the drawings, wherein like characters indicate like parts throughout the several views:

Fig. 1 is a view in side elevation of my pump;

Fig. 2 is a view partly in end elevation, and partly in vertical axial section taken substantially on the line 2-2 of Fig. 1; and

Fig. 3 is a view in vertical section taken on the line 3--3 of Fig. 2.

Referring with greater particularity to the drawings. the numeral I indicates in its entirety a pump housing comprising 'a main section 2 and a cover plate section 3. As shown, the section 2 has a large circular bore 4 therein, and a laterally projecting bearing boss 5 with a reduced opening 6 therein which extends into the bore 4. Cover plate section 3 is secured to the main housing section 2 by means of circumferentially-spaced. headed bolts 1, and provides, with said section 2, a cylindrical impeller chamber 8. The cover plate section 3 is provided with a laterally projecting bearing boss 9.

A drive shaft I extends eccentrically through the cylindrical chambers and has its opposite end portions journalled for rotation in the opposed bearing bosses and 9 of the housing section 2 and 3 respectively. Impeller element 3 Claims. (onus-117) H is secured to the intermediate portion of the drive shaft in for rotation therewith within the chamber 8. The specific nature of the impeller element I I does not form any part'of our present invention, but, as shown, is of the type having rollers l2 mounted within circumferentiallyspaced radially outwardly opening recess l3 in the periphery of the impeller ll. Roller elements 12 are adapted to work radially inwardly and outwardly of the recess upon rotation of the impeller ll while engaging the. cylindrical wall 14 of the chamber 8. The circumferen tiaIIy-spaced inlet and outlet passages are identifled by. thenumerals l5 and l6. 6

tionaltpressure'seal I1 is interposed between the housing section 2 and the drive shaft ill within the bearing boss 5. Also, a conventional ballbearing race I8 is provided to reduce friction between the drive shaft l0 and the bearing boss 5 to a minimum. A similar seal and bearing race, not; shown, are provided within the bearing boss 9. As shown, the drive shaft I0 is tubular and has diametrically enlarged portions I9 and 20 which open axially outwardly at its opposite ends. The reduced central portion 2! provides an annular shoulder 22, against which the head portion 23 of a bolt 24 abuts. The opposite end of the bolt 24 is provided with screw-threads 25. As shown, the screw-threaded end 25 of the bolt 24 projects axially outwardly through the recess 20, whereby to provide an annular recess 26.

A cylindrical driving head 21 has a reduced axially extended end portion 28 which is telescopically received in the annular recess 26, the threaded portion 29 thereof receiving the threaded portion 25 of the bolt 24. It will be noted that the cooperating threaded portions 25 and 29 respectively of the bolt 24 and head 21 are such that the head 21 tends to unscrew itself from the bolt 24 under normal driving rotation, as indicated by the arrow in Fig. 3.

In order to operatively secure the driving head 2'! to the drive shaft II], we insert a shear-pin 30 in axially alignable openings 3| and 32 in the adjacent end portions of the shaft l0 and head 2'! respectively. Preferably and as shown, the head 21 is provided with a plurality of circumferentially-spaced openings 32 which open into the bottom wall 33 of an axially outwardly opening socket 34.

From the above it should be obvious that when the impeller i I, when subjected to abnormal friction, breakage, or the like, is rotated in the direction of the arrow on element 28 of Fig. 3,

the pin 30 will shear, whereupon continued rotation of the driving head 21 will cause same to be unscrewed at least partially from the bolt 24. In this manner, any further rotation of the binding impeller H is terminated, and further damage is avoided. In the event that the binding is merely caused by undue friction, the head 21 may be reapplied to the threaded end 25 of the bolt 24 by first removing same therefrom, thereafter removing the sheared end portion of the shear-pin 30 from the recess 32 in the drive shaft l0, screwing the head 21 onto the screw-threaded end 25 of the bolt 24 in a clockwise direction until the recesses 3| and '32 are in alignment, and reinserting the shear-pin 30 into said aligned opening.

()ur invention has been thoroughly tested and found to be completely satisfactory for the accomplishment of the above objects, and while we have illustrated a commercial embodiment thereof, it should be obvious that same is capable of modification without departure from the scope of the invention as defined by the appended claims.

What we claim is:

1. 'In a fluid pump, a housing comprising a main section and a cover plate section therefor, said housing defining a cylindrical chamber having circumferentially-spaced inlet and outlet passages, a drive shaft extending through said chamber eccentric to the axis thereof and havin its opposite ends journalled for rotation in said housing sections, an impeller element on said shaft within said chamber, said drive shaft having an axial opening therethrough, a headed bolt extending through said opening, said bolt having a head at one end and terminating at its opposite end in screw-threads, said opening through said drive shaft having a diametrically enlarged portion providing an annular axially extended opening about said screw-threaded end, a rotary driving head having a diametrically reduced end portion telescopically receivable in said annular recess and having a central screwthreaded opening for the reception of the threaded end of said bolt, the direction of the threads on said bolt and driving head being such that said head tends to unscrew itself from said bolt under normal driving rotation, and a shearpin rotated by said driving head and shaft and connecting same for common rotary movements,

2. The structure defined in claim 1 in which said driving head, and the adjacent end of said drive shaft, is provided with axially extended alignable openings for the reception of said shearpm. i

3.. The structure defined in claim 1 in which said driving head defines a socket concentric with the axis of said drive shaft, the bottom of said socket and the adjacent end of said drive shaft having axially extended alignable recesses for the reception of said shear-pin.

HARRY J. SADLER. ERNEST E. COOK.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,865,438 Friedemann July 5, 1932 .-2, 4 ','7'9'7 .Bochmann et a1. Aug. .4, 1936 2,541,405 Chapman Feb. 13, 1951

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