US1738786A - Fuel pump - Google Patents

Description

Dec. 10, 1929. c, WQMQKINLEY FUEL PUMP Filed June 23, 1928' Patented Dec. 10, 1929 UNITED STATES PATENT OFFICE I CHARLES w. MCKINLE'Y, or FLINT, MICHIGAN, ASSIGNOR TO A c SPARK I-ILUG com- PANY, or FLINT, MICHIGAN, A COMPANY or MICHIGAN FUEL rum? Application filed June 23,

Although this invention is referred to as a fuel pump, it relates more particularly to a specific thrust-refusing connection between a reciprocated actuating element and a diaphragm stemor equivalent element attached to a pump diaphragm or other re'ciprocatory pumping element adapted to receive a variable stroke, said stroke being diminished in vgesponse to pressure within a pump cham- The principles of this invention being applicable to various types of fuel pumps, or the like, the illustrated pump is of the same general type asthat described and claimed in a pending application of Abraham M. Babitch, Serial No. 123,370, filed July 19, 1926; but the present invention may be regarded as relating particularly to the use of a flexible link, loop or the like in the imparting of variable intake strokes to a pumping element, and to preferred means and methods of securing and using an interme- I diate thrust-refusing element of the general character referred to.

Other objects of this invention may be best appreciated from the following description of specific embodiments thereof, taken in connection with the appended claims and the accompanying drawings. I

Fig. 1 may be referred to as an elevational view, with parts shown in substantially median section.

Fig. 2 is a view comparable with a central portion of Fig. 1, but showing features 0 modification. I v

Fig. 3 is a detail view showing one type of flexible link suitable for use as suggested in Fig. 2. I

Fig. 4: is a detail view corresponding to a central portion of Fig. 2, but showing an alternative construction in which a link similar to that shown in Fig. 3, but imperforate, may be employed.

Referring first to Fig. 1, 10 and 11 being respectively a body casting and a cover cast- 1928. Serial No. 287,754.

lever 17 is shown as pivoted at 18 and as adapted to be continuously engaged by a reciprocatory or rotating driven element such as a cam 19 upon a shaft 20, and an inner end 21 of said lever may be provided with means such as a compression spring retained between cupped plates 22 and 23, tending constantly to press said lever against the cam 19, or its equivalent, adapted cyclicall to give said lever a uniform throw.

Cbming now to the novel features of the new combinations to whose protection the present application is directed, a flexible band or link or loop 24 formed of substantially inextensible material, is shown as secured Between the lower end or' a foot25 upon the diaphragm stem 16 and the inner end 21 of the lever 17by means comprising screws 26, 26' and clips 27,- 27, -the latter being provided with curved surfaces, as at 28, 28" over which said band, link or loop may be bent without avoidable danger of breakage.

Referring to the showing in Fig. 1, the flexible element 24, whether or not said flexible element is formed from separate strands, as in the case of a cord or cable, may be circular in cross section and, in that case, it may be so bent and disposed with reference to the inner end of stem 16 and the lever end 21, and also with reference to the clips 27, 27, that the flexin thereof shall take place in an inward directlon, but not necessarily in the plane of reciprocation of the lever 1 For example,

connection with. thedotted line showing at' 24' Fig. 1. 1o l arts'shown in Fig. 2 being identified b reference characters heretofore employe but with the character a added thereto, the

' link 24 may be either circular, in cross sectional outline or ofbelt-like character. That is to say, as suggested in Fig. 3,'the thrustrefusing element here referred to may be cut from'tubular stock or formed from a tapelike material cut to suitable length and provided with overlapping ends, somewhat as suggested at 29, an in case thiselement'is to be'secured by means such as screws 26", 26% and clips 28', 28", the lower end of the loop 24" may advantageously be secured to any actuating element, such as the inner end'21 of the'lever 17 by means such as a pivoted connection fitting 30", shown as adapted to receive the screw 26" and as secured by a transverse in 31. The construction here referred to is obviously such-as largely to obviate unequal distribution of strain upon the {Ink or loop 24' during reciprocation of said ever.

As a further alternative, dispensing with the mentioned'screws and clips as suggested in Fig. 4 the lower end or foot 25" of a valve stem and the inner end 21" of an actuating element, suclr as the lever 17", may be respectiyelyprovided with fixed or rotatable pivot ms 32'', 32" over which a flexible loop or link 4': ma be so disposed that, whether or not 1t 15 i erently resilient (as suggested by the dot-ted lines 24) it may automatically shift its contact with said pins, thereb eflect-ing a distribution of wear which is avorable to advantageously be built up from several .gtrands or lies of a flexible but substantially mextensib e material, whether textile, metalhe, or other, in such manner as to assure durability. It will also be noted that the flexible intermediate elements described are preferably so secured as to predispose the same to- "with an attached handling element for-re- "ment.

long use; and it will be understood that any' of the described bands, loops or links may I claim: v

1. A pressure-responsive pumping organization including a reciprocable pump ng element provided with pressure-responsive resilient means for advancing the same and m tracting the same, a uniform throw actuatmg element, and thrust-refusing means in- E terposed between said handling element and said reciprecatory element and having the '76 form of a flexible link formed of a substan- Y tially ,inextensible material, the straightening of which gives a fixed inner limit to intake strokes imparted by said actuating ele- 2. A pressure-responsive pumping organization including a reciproca 1e pumping-clef ment provided withpressure-responsive re silient means for advancing the same and with an attaehed-handling element for retracting the same, a uniform throw actuating element, and a flexible element formed of substantially inextensible material and so secured between said actuating element and said handling element as to predispose said flexible element toward contraction and to impart intake strokes which have ,a fixed inner limit. I i

v 3 .A ressure-responsive pum mg orgamzation including a reclprocab e pump ngr element provided with pressure-responsive resilient means for advancing the same and with an attached handling element for retracting the same, a uniform throw actuating no element, anda flexible element formed of substantially inext'ensible material and so se-, cured between said actuating element and said handling element as to predispose said flexible'element toward contraction, portions of said flexible element 'by which the same is secured being dis osed substantially paral V 'lel with one another and to im art intake strokes which have a fixed inner imit.

4. A pressure-responsive umping organi- 1 1o zation including a reciproca le pumping elemerit provided with a pressure-responsive resilient means for advancing the same and with an attached handling element, a uni-v form throw reciprocatory actuating element, and a substantially inexten'sible 'but flexible element in the form of a loop secured between said actuating element and said handling element, portions of said loop by whichthe same is secured being disposed substantially-mo parallel withone another. substantially parallel zation includinga reciproca 5. A pressure-responsive pumping-organile pumping element provided with pressure-resppnsive resilient means for "advancing the same 12 and with an attached handling element 'for retracting the same, a uniform .throw actuating element, and thrust-refusing means interposedibetween said handling element and said actuating element and the form of a flexible linkformed of a plurality of laps of fabric.

6. A pressure-responsive gumping organization including a reciproca 1e pun ping element provided with pressure-responsive resilient means for advancing the same and with an attached handling element for retracting the same, a uniform throw actuatin element, a thrust-refusing means interpose between said handling element and said actuating element andhaving the form of a flexible link formed of a plurality of la of fabric and secured to said actuating e ement by means providing a pivotal connection.

In testimony whereof I aflix my signature.

CHARLES W. MoKINLEY.

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