Title:
Pump
United States Patent 2324524


Abstract:
Patented July 20, 1943 UNITED STATES PATENT 2,324,524 Jean Mercier, Neuilly-sur-Seine, France; veste in the Allen Property Custodian Application June 29, 1939, Serial No. 281,861 In France July 6, 1938 4 Claims. (Ci. 103-173) The present invention relates to pumps of the axis. When the ca type...



Inventors:
Jean, Mercier
Application Number:
US28186139A
Publication Date:
07/20/1943
Filing Date:
06/29/1939
Assignee:
Jean, Mercier
Primary Class:
International Classes:
F04B1/29
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Description:

Patented July 20, 1943 UNITED STATES PATENT 2,324,524 Jean Mercier, Neuilly-sur-Seine, France; veste in the Allen Property Custodian Application June 29, 1939, Serial No. 281,861 In France July 6, 1938 4 Claims. (Ci. 103-173) The present invention relates to pumps of the axis. When the ca type generally designated wabble plate pumps, yielding means actin each such pump comprising a plurality of pistons ton-like element is arranged in a circular series with their axes dis- increase in compres posed in parallelism, the movements of all pis- 5 piston-like element t tons of the series being controlled and effected by the cam. means of a single cam, the series of pistons and The principal obje. the cam being relatively rotatable about a com- to obviate these di mon axis, which is the axis of the pump. pump is so designed The single cam is itself pivotally mounted for 10 tween the pusher or rocking movement upon a cam-supporting mem- ,cam travels a relativi ber, whichmember may be driven to effect rota- there is a relatively tion of the cam and operation of the pump. The the cam about its pil cam is pivotally mounted about an axis disposed yieldably resisting rc in a plane perpendicular to the pump axis and 1i acts at a point relati the oscillations or rocking movements of the cam of the cam, the sp about this axis, in different directions of rotation, yielding resistance ( are produced by two different means, the re- be very light in weigl sultant of the reactions Qf the pistons due to invention is charac back pressure of the delivered liquid on the pis- 20 axis about which th tons tending to move the cam into a plane normal in a plane normal to to the pump axis, and means being provided for to a circle in said pla resisting with a substantially constant force rock- pump axis, the radi ing movement of the cam produced by increase than the radius of a in the resultant pressure exerted on the cam by 25 piston axes. the pistons and for rocking said cam in the re- In the accompanyi verse direction whenhensaid resultant pressure of of the invention is 1 the pistons decreases, the force delivered by said being set forth solely means being imparted to the cam by a pusher or In the drawing the piston-like member positioned on the axis of the 30 by the numerals I an pump and mounted for movement along said axis. by a cam indicated ý This pusher or piston-like member may be actu- upon the adjacent en ated by hand from outside the pump as well as member may also bi being normally operative in an automatic man- Upon that side of th ner. 35 tons is positioned a p The arrangement thus generally described 5 which is acted upc makes possible the construction of a pump and normally urged ther pressure regulator of efficient type which is very piston is reciprocabl small in size. The fluid delivered by the pump viously stated, and t is intended to be transmitted to some fluid pres- 40 each cylinder are at t sure operated apparatus and, when the effect of the head of the assoc such apparatus is such that the pressure upon Relatiye rotatirn (r the pistons of the pump is increased. these paral- member 4 upon whic lel pistons act against the cam with increased cular series of pisto force so that the cam is rocked about its pivotal 45 suitable motor and 1: iqYi nnvaron i -, f , Ti -\n-. ,if 4-1. " -" 11e.,. . -..n .. member 4' axially of the tube 4, the member 4' comprising both a closure for the outer end of the tube and an adjustable abutment for the outer end of the spring 6. As previously stated, the axis of the pivot 3 which connects the enlarged end of tubular member 4 to the cam is disposed closer to the pump axis than are the axes of the several pistons I, the axis of pivot 3 being preferably as close as possible to the pump axis. This arrangement is highly advantageous In the first place, it insures improved pump operation, as compared with previous pumps of this general type and, in addition, it permits a better distribution of the stresses in the pump and also permits the use of a much lighter spring than would otherwise be required.

According to a further feature of the invention the pusher or piston-like element 5 is provided with one or more apertures or channels 7 connecting the space within the tubular member 4 with the space within the housing which encloses the cam and pistons. The pusher or piston-like member 5, therefore, operates as a dash pot and serves to dampen vibration of the cam 2, the dash pot or vibration damping action of member 5 being particularly helpful when the pump includes but a relatively small number of pistons, in which case the force applied against the cam will fluctuate.

Obviously the invention is not limited to the embodiment described and illustrated, which embodiment has been set forth by way of example only.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is: 1. In a wabble plate pump, in combination, a plurality of pump cylinders disposed in a circular series about, and substantially equidistantly from, a pump axis, each cylinder having an associated piston and the several pistons being disposed in parallel relationship to each other and to said axis, a cam disposed transversely of said axis and so as to engage and act upon the heads of the said pistons, a cam supporting member disposed adjacent said cam, said member and said series of cylinders being relatively revoluble about said axis, means pivotally connecting said member and cam whereby the cam and member are constrained to rotate together and the cam is supported for rocking movement about an axis disposed in a plane normal to said pump axis and tangent to a circle in said plane which is centered on said pump axis, the radius of said circle being less than the radius of a cylinder which includes the piston axes, and means for resisting with a substantially constant force rocking movement of the cam produced by increase in the resultant pressure exerted on the cam by the pistons, and for rocking said cam in the reverse direction when said resultant pressure of the pistons decreases.

2. In a wabble plate pump, in combination, a plurality of pump cylinders dis.osed in a circulai series about, and substantially equidistantly from, a pump axis, each cylinder having an associated piston and the several pistons being disposed in parallel relationship to each other and to said axis. a cam disposed transversely of said axis and so as to engage and act upon the heads of the said pistons, an elongated tubular member the axis o1 which is coincident with the pump axis and one end of which is adjacent said cam, said membe: being rotatable about said axis, means pivotall1 connecting said member and cam whereby the cam and member are constrained to rotate together and the cam is supported for rocking movement about an axis disposed in a plane normal to said pump axis and tangent to a circle in said plane which is centered on said pump axis, the radius of said circle being less than the radius of a cylinder which includes the piston axes, and means disposed within and carried by said elongated tubular member for resisting with a substantially constant force rocking movement of the cam produced by increase in the resultant pressure exerted on the cam by the pistons, and for rocking said cam in the reverse direction when said resultant pressure of the pjstons decreases.

3. In a wabble plate pump, in combination, a plurality of pump cylinders disposed in a circular series about, and substantially equidistantly from, a pump axis, each cylinder having an associated piston and the several pistons being disposed in parallel relationship to each other and to said axis, a cam disposed transversely of said axis and so as to engage and act upon the heads of the said pistons, a cam supporting member disposed adjacent said cam, said member and said series of cylinders being relatively revoluble about said axis, means pivotally connecting said member and cam whereby the member and cam are constrained to rotate together and the cam is supported for rocking movement about an axis disposed in a plane normal to the pump axis and spaced laterally of said pump axis, and means including a dash pot mounted on said member for resisting, with a yieldably resisting force, rocking movement of the cam produced by increase in the resultant pressure exerted on the cam by the pistons, and for rocking said cam in the reverse direction when said resultant pressure of the pistons decreases.

4. In a wabble plate pump, in combination, a plurality of pump cylinders disposed in a circular series about, and substantially equidistantly from, a pump axis, each cylinder having an associated piston and the several pistons being disposed in parallel relationship to each other and to said axis, a cam disposed transversely of said axis and so as to engage and act upon the heads of the said pistons, an elongated tubular member the axis of which is coincident with the pump axis so z,nd one end of which is adjacent said cam, said member and the series of pump cylinders being relatively rotatable i.out the pump axis, means pivotally connecting the cam to the adjacent end of said tubular member whereby the cam and r5 member are constrained to rotate together and the cam is supported for rocking movement about an axis disposed in a plane normal to the pump axis and spaced laterally of said pump axis, a closure for that end of the tubular member which is remote from the cam, and means disposed within said tubular member for resisting, with a substantially constant force, rocking movement of the cam produced by increase in the 7esultant pressure exerted on the cam by the pistons and g5 for rocking said cam in the reverse direction when S said resultant pressure of the pistons decreases, S said last mentioned means Including an aperS tured piston-like element slidably fitting within I that end 'of the tubular member adjacent tie 1 70 cam and comprising with Ihe tubular member S and its closure a dash pot, and a spring within * said tubular member one end of which bears against said piston-like element and the'other r against said closure.PI JEAN MERCIER.