US3289607A

US3289607A - Pump apparatus

Info

Publication number: US3289607A
Application number: US377889A
Authority: US
Inventors: Raymond A Delligatti
Original assignee: Individual
Current assignee: Individual
Priority date: 1964-06-25
Filing date: 1964-06-25
Publication date: 1966-12-06
Anticipated expiration: 1983-12-06

Description

1966 R. A. DELLIGATTI 3,289,607

PUMP APPARATUS Filed June 25, 1964 3 $heetsSheet 1 II I H! im' INVENTOR WAvMoNb ADeLucTA-r'rl WCLSo /i mu ELL ATTORNEYS D 1965 R. A. DELLIGATTI 3,289,607

PUMP APPARATUS Filed June 25, 1964 5 Sheets-Sheet 2 INVENTOR Raw mm m A. DELLEGATT\ wasow i wwikggffzwnm $5., ATTOR NFSYS Dec. 6, 1966 R. A. DELLIGATTI PUMP APPARATUS 5 Sheets$heet 5 R v n A E V W RAYMOND A. DELuGAT-m BY W ma zmwuflb $169M): ma

ATTORNEYS III/lay Filed June 25, 1964 ill/5,1174? I United States Patent 3,289,607 PUMP APPARATUS Raymond A. Delligatti, 815 Ogden Ave., Fairmont, W. Va. Filed June 25, 1964, Ser. No. 377,889 7 Claims. (Cl. 103178) This invention relates to a pump apparatus and more particularly to an apparatus for pumping fluid cementitious materials such as plaster and the like.

In the plastering art, it has been desirable to have a machine suitable for applying plaster to interior walls, ceilings, partitions and the like of building structures. Considerable effort has been made in the past to develop such a machine, but most plastering machines in the prior art have been found not to be entirely satisfactory in construction and performance. The difiiculty in developing an effective machine for applying plaster material to surface areas is due primarily to the nature of the plaster material. Generally, a preparation of plaster material consists of a mixture of gypsum plaster or quicklime and water in the form of a viscous fluid substance. Most plastering machines provide for pumping the mixture from a hopper through conduits to the applicator device. In the course of such pumping, the water in the mixture is forced out, resulting in either the delivery of plaster of a nonuniform consistency or premature hardening of the mixture. It also has been found that the removal of the water from the mixture during the pumping action results in the deposit and eventual hardening of plaster within the pumping apparatus, thereby impairing the operation of the machine.

Accordingly, it is the principal object of this invention to provide an improved pump apparatus.

Another object of this invention is to provide an improved pump apparatus suitable for pumping fluid cementitious materials such as plaster and the like.

A further object of this invention is to provide an improved pump apparatus for pumping fluid cementitious materials such as plaster and the like, which is adapted to pump the material without appreciably disturbing the consistency of the mixture.

A still further object of this invention is to provide an apparatus for pumping a fluid plaster mixture which will avoid forcing the water out of the mixture.

Another object of this invention is to provide an improved pump apparatus for pumping fluid cementitious materials wherein the deposit and hardening of the material within the apparatus is avoided.

A further object of this invention is to provide an improved pump apparatus for pumping fluid cementitiou materials having a novel piston construction.

A still further object of this invention is to provide an improved pump apparatus for pumping fluid cementitious materials such as plaster and the like, having a novel piston construction which will not force the water out of the fluid mixture.

Another object of this invention is to provide an improved piston construction for a reciprocating type of pump apparatus adapted for use in pumping fluid cementitious materials, which prevents the deposit and hardening of cementitious materials thereon.

A further object of this invention is to provide a pump apparatus for pumping fluid cementitious materials which is self cleaning during the normal operation thereof.

A still further object of this invention is to provide an improved pump apparatus for pumping fluid cementitious materials such as plaster and the like, which is simple in construction, easy to assemble and inexpensive to manufacture.

Other objects and advantages of the present invention will become more apparent to those persons skilled in the Patented Dec. 6, 1966 art, from the following description taken in conjunction with the accompanying drawings, wherein:

FIGURE 1 illustrates a top plan view of a first embodiment of the invention, having portiOns thereof broken away;

FIGURE 2 is a cross-sectional view taken along line 22 in FIGURE 1;

FIGURE 3 is an enlarged vertical cross-sectional view of a pump chamber of the embodiment shown in FIG- URES l and 2, illustrating the relative positions of the piston head and connecting rod during a pumping stroke;

FIGURE 4 is a view similar to FIGURE 3, illustrating the relative positions of the piston head and the connecting rod during a return stroke of the assembly;

FIGURE 5 is a cross-sectional view taken along line 5-5 in FIGURE 4;

FIGURE 6 is an exploded view of the piston head and connecting rod assembly, having a portion thereof broken away;

FIGURE 7 is a vertical cross-sectional View of a pumping chamber of a second embodiment of the invention illustrating the piston head and connecting rod assembly during a return stroke thereof; and

FIGURE 8 is a view similar to FIGURE 7 illustrating the piston head and connecting rod assembly during the return stroke thereof at a position subsequent to the position illustrated in FIGURE 7.

Briefly described, the present invention relates to a pump apparatus generally comprising at least one pump chamber having a discharge opening and a material supply opening, a piston head having a passageway therethrough slidably disposed in the pump chamber between the openings thereof and an actuating rod disposed in the chamber and .operatively connected to the piston head. The actuating rod is operative to close the passageway in the piston head during the pump stroke, and to permit the passageway to remain open during the return stroke thereof. Means are provided for reciprocating the actuating rod, and one-way valve means also are provided, disposed in the pump chamber between the discharge opening thereof and the piston head. In a second embodiment of the invention, cleaning means are provided in the pump chamber engageable with at least a portion of the actuating rod for cleaning the same during a portion of the return stroke thereof. Preferably, the cleaning means engages at least portions of the actuating rod and the piston head for removing residual material deposited thereon.

Referring to FIGURES 1 through 6 of the drawings, there is illustrated a preferred embodiment of the invention. Specifically, there is provided a frame member 10, including a base portion 11 and a pair of spaced vertical walls 12 and 13. Mounted in suitable openings in the upper ends of the walls 12 and 13 is a pair of

cylindrical conduits

14 and 15 providing a pair of cylindrical working or pumping chambers 16 and 17 having horizontal parallel axes. Threadedly secured to the forward or discharge ends of the

conduits

14 and 15 is a pair of identical valve sections 18 and 19. As illustrated in FIGURE 2, valve section 19 is provided with an axial passageway having con-

ical sections

20 and 21 providing a restricted center opening 22. The restricted opening 22 is adapted to be closed during the return stroke of the piston head and connecting rod assembly of the apparatus, by means of a check ball 23, having a diameter larger than the diameter of the restricted opening 22. The ball 23 further is restricted in its forward travel by means of a pin 24 extending across the conical section 21.

The valve sections 18 and 19 are connected to a common discharge line 25, by means of a Y-shaped conduit 26. The conduit 26 is provided with branching

sections

27 and 28 which are provided with annular flanges 29.

The

sections

27 and 28 are secured to the valve sections 18 and 19 by means of fittings 30 and 31, each of which are provided with an annular flange portion 32, which engages the annular flange portion 29 when the rearward end of the fitting is threaded onto the forward end of the valve section.

Mounted on the rearward or supply ends of the

conduits

14 and 15 is a hopper 33. The hopper generally consists of a vertically disposed cylindrical section 34, a downwardly and forwardly extending bottom wall portion 35, a pair of laterally spaced and forwardly projecting

portions

36 and 37 which are adapted to threadedly receive the rearward ends of the

conduits

14 and 15, so that the pump chambers 16 and 17 communicate with the hopper and a pair of laterally spaced connecting

rod housing portions

38 and 39 which are aligned with the

conduits

14 and 15. Disposed within the vertical section 34 of the hopper is a feed auger 40, having a vertically disposed shaft 41 journaled and supported at its lower end within a suitable bearing housing 42, depending from the bottom wall portion 35 of the hopper. The auger can be driven by any suitable independent means or can be driven through any suitable operative connection by the drive means for the piston and rod assemblies.

Referring to FIGURE 2 of the drawing, there is illustrated the piston head and connecting rod assembly 43, consisting of a piston head 44 slidably mounted in pumping chamber 17 and a connecting rod 45 operatively connected at its forward end to the piston head 44, and at its rearward end to a suitable reciprocating mechanism. The piston head assemblies in each of the pumping chambers 16 and 17 are identical in structure and are operatively connected to the same reciprocating mechanism, so that they reciprocate alternately. The piston head 44 is adapted to slide freely along the length of the pump chamber 17 and is provided with an axial passageway 46 therethrough, which includes a rearwardly facing conical surface 47 merging with a forwardly facing conical surface 48 to provide a restricted circular opening 49. The connecting rod 45 includes a stem portion 50 and an enlarged head portion 51. The stem portion 50 is substantially elongated and extends through a mounting block 52 disposed in the housing portion 39 which is provided with a closure nut 53. The enlarged head portion 51 has a rearwardly facing conical surface 54 and a forwardly facing conical surface 55 which provide an intermediate merging section 56 having a diameter larger than the diameter of the restriction 49 in the passageway through the piston head. As best seen in FIGURE 3, the rearward end of the conical surface 55 of head portion 51 is adapted to engage and be seated on the forward end of the conical sur face 47 of the passageway during the pump stroke of the connecting rod to close the passageway in the piston head. The forward end of the piston head also is provided with an axial threaded opening 57 which receives a threaded stud portion of a carrier member 58. The carrier member has a substantially conical surface forming a continuation of the conical surface 55 of the head portion 51 and a plurality of radially and forwardly extending arm members 59. As best seen in FIGURE 4, the arm members 59 are adapted to engage the piston head 44 during the return stroke of the connecting rod after the conical surface 55 of the head portion 51 becomes unseated relative to the conical surface 47, opening the passageway through the piston head.

In the operation of the embodiment illustrated in FIG- URES 1 through 6, plaster material is deposited in the hopper 33, which is forced downwardly into the pumping chambers 16 and 17 while the piston and connecting rod assemblies reciprocate alternately. During the pumping stroke of a connecting rod, the head portion 51 thereof engages the conical surface 47 of the passageway in the piston head to close the passageway, permitting plaster to be pumped through the pumping chamber. During the pumping stroke, the ball 23 in the valve section 19 will be unseated, permitting passage of the plaster material through the valve section 19 and the conduit 26 to the discharge line 25. During the return stroke of the connecting rod, the head portion 51 thereof will be unseated relative to the conical surface 47 to open the passageway in the piston head. After the head portion 51 becomes unseated, the ends of the arm members 59 will engage the front end of the piston head to carry the same rearwardly while the passageway 46 remains open. As the piston head moves rearwardly with the passageway open, additional plaster material is permitted to be forced down through the hopper into the pump chamber 17 for the next succeeding pumping stroke. It will be appreciated that during the return stroke of the connecting rod, and the pumping stroke of the other connecting rod, the ball 23 will become seated in the restriction in the valve section, preventing material in the conduit 26 from returning into the pump chamber 17. With the connecting rods in the pump chambers 16 and 17 reciprocating alternately, it will be appreciated that a continuous supply of plaster is delivered under pressure to the discharge line 25. It further will be appreciated that the freedom of relative movement between the head portion 51 and the piston head permits the piston head to become positively seated on the conical surface 47 of the passageway 46.

The arm members 59 are preferred to be slender in cross-sectional configuration, as shown in FIGURE 5, to readily permit the plaster material to pass through the passageway in the piston head. It also will be appreciated that the continuous seating and unseating of the head portion 51 in the passageway 46 of the piston head will prevent the deposit and hardening of the plaster material on the piston head and connecting rod assembly.

Referring to FIGURES 7 and 8 of the drawings, there is illustrated a second embodiment of the invention. This embodiment includes a conduit 60 providing a pump chamber 61, which communicates with a material supply inlet 62. Disposed within the pump chamber 61 is a piston head and connecting rod assembly 63 which is similar in construction and operation to the assembly described in connection with the first mentioned embodiment of the invention. This embodiment also includes, however, a cleaning means 64 disposed in a rearward extension 65 of the pump chamber 61. The cleaning means 64 consists of a receptacle member 66 adapted to slide along the length of the pump chamber extension 65, having a base portion 67 with an axial opening therein for receiving the stem portion 50a therethrough and an annular flange portion 68. The cleaning means also includes a contact member 69 which is seated within and secured to the receptacle 66. The contact member 69 is provided with an outer conically shaped surface 70 and an inner conically shaped surface 71, which are engageable with and complementary to the conical surface 47a of the piston head and conical surface 54a of the head portion of the connecting rod, respectively, when the piston head and connecting rod approach their rear ward end of travel, as seen in FIGURE 8. The pump chamber extension 65 is provided with a slightly larger diameter than the pump chamber 61, to provide an annular shoulder 72, engageable with the front edge of the annular portion 68 of the receptacle 66 to limit the forward travel of the cleaning means. The forward edge of the annular portion 68 is urged into contact with the annular shoulder 72 by means of a spring 73 interposed between the rear wall of receptacle 68 and the front wall 74 of an end cap 75 threadedly mounted on the end of the conduit extension. The end cap 75 also is provided with a bushing 76, which receives the stem portion of the connecting rod therethrough.

The embodiment illustrated in FIGURES 7 and 8.is adapted to operate in the same manner as the first mentioned embodiment. Except, when the piston head and the head portion of the connecting rod approach their end of travel during the return stroke thereof, the conical surface 54a will engage the surface 71 of the contact member, and the conical surface 47a of the passageway in the piston head will engage the conical surface 70 of the contact member, as illustrated in FIGURE 8. The contact member 69 preferably consists of a relatively flexible yet wear resistant material, which will permit the positive engagement of the complementary surfaces, thereby wiping the surfaces 47a of the piston head end 54a of the head portion of the connecting rod. It will be noted that the cleaning means 64 also is yieldable rearwardly, to further assure positive seating of the complementary engaging surfaces. With the cleaning means as provided in the embodiment illustrated in FIGURES 7 and 8, at least portions of the

surfaces

54a and 55a of the head portion of the connecting rod and surfaces 47a of the passageway in the piston head will be continuously wiped, thereby preventing the accumulation of material within the pump chamber which would eventually affect the operation of the apparatus.

From the foregoing detailed description it will be evident that there are a number of changes, adaptations and modifications of the present invention which come within the province of those skilled in the art. However, it is intended that all such variations not departing from the spirit of the invention, be considered as within the scope thereof as limited solely by the appended claims.

What I claim is:

1. A piston construction comprising a piston head having a passageway therethrough, said passageway having rearwardly and forwardly facing conically shaped sections defining a restriction in said passageway, a connecting rod receivable within said passageway, said connecting rod having a forwardly facing surface complementary to and engageable with the rearwardly facing conically shaped section of said passageway during the pump stroke thereof for closing said passageway and said connecting rod having a plurality of forwardly and outwardly extending arm members having the ends thereof engageable with the forward end of said piston head during the return stroke of said connecting rod whereby the piston head may be moved while permitting said passageway to remain open, each of said arm members having a slender cross-sectional configuration.

2. A pump apparatus comprising at least one pump chamber having a discharge opening and a material supply opening, a piston head having a passageway therethrough slidably mounted within said pump chamber between the openings thereof, said passageway having rearwardly and forwardly facing conically shaped sections defining a restriction in said passageway, a connecting rod disposed in said pump chamber and receivable within said passageway, said connecting rod having a forwardly facing surface complementary to and engageable with the rearwardly facing conically shaped section of said passageway during the pump stroke thereof for closing said passageway, said connecting rod having a plurality of forwardly and outwardly extending arm members having the ends thereof disposed at the forward end thereof engageable with the forward end of said piston head during the return stroke of said connecting rod rearwardly while permitting said passageway to remain open,

means for reciprocating said connecting rod and one way valve means disposed in said pump chamber between the discharge opening thereof and said piston head, each of said arm members having a slender cross-sectional configuration.

3. A pump apparatus comprising at least one pump chamber having a discharge opening and a material supply opening, a piston head having a passageway therethrough slidably disposed in said pump chamber between the openings thereof, said passageway in said piston head having a restricted section, an actuating rod disposed in said pump chamber and receivable within the passageway of said piston head, said actuating rod having means engageable with the restricted section of said passageway during the pump stroke thereof for closing said passage way, said actuating rod having means engageable with said piston head for carrying said piston rearwardly during the return stroke thereof while permitting said passageway to remain open, means disposed in said pump chamber engageable with at least portions of said actuating rod and said piston head during the return movement thereof for cleaning the same, means for reciprocating said actuating rod and one way valve means disposed in said pump chamber between the discharge opening thereof and said piston head.

4. A pump apparatus comprising at least one pump chamber having a discharge opening at the forward end and a material supply opening at the rearward end thereof, a piston head having a passageway therethrough slidably disposed in said chamber between the openings thereof, said passageway in said pump head having a rearwardly facing section defining a seating surface, a connecting rod disposed in said chamber, said connecting rod having a head portion at the forward end thereof receivable within the passageway of said piston head, said head portion having a surface engageable with the seating surface of the passageway of said piston head during the pump stroke thereof for closing said passageway, said connecting rod having means engageable with said piston head for carrying said piston head during the return stroke thereof while permitting said passageway to remain open, means disposed in said chamber engageable with at least the head portion of said connecting rod for cleaning the same, means for reciprocating said connecting rod and one way valve means disposed in said pump chamber between the discharge opening thereof and said piston head.

5. A pump apparatus comprising at least one pump chamber having a discharge opening at the forward end and a material supply opening adjacent the rearward end thereof, a piston head having a passageway therethrough slidably disposed in said pump chamber between the openings thereof, said passageway in said piston head having a rearwardly facing conically shaped section defining a seat, a connecting rod disposed in said pump chamber, said connecting rod having a head portion receivable within the passageway of said piston head, said head portion of said connecting rod having a forwardly facing surface complementary to and engageable with the seat of said passageway during the pump stroke thereof for closing said passageway, said connecting rod having means engageable with said piston head for carrying said piston head rearwardly during the return stroke of said connecting rod while permitting said passageway to remain open, cleaning means disposed at the rearward end of said chamber, said head portion of said connecting rod and said cleaning means having complementary surfaces engageable at the end of the return stroke of said connecting :rod, means for reciprocating staid connecting rod and one way valve means disposed in said pump chamber between the discharge opening thereof and said piston head.

6. A pump apparatus comprising at least one pump chamber having a discharge opening at the forward end having material supply openings adjacent the rearward end thereof, a piston head having a passageway therethrough slidably mounted within said pump chamber between the openings thereof, said passageway having a rearwardly facing section defining a seating surface, a connecting rod disposed in said chamber, said connecting rod having a head portion receivable within the passageway of said piston head, said head portion having means engageable with the seating surface of said passageway during the pump stroke of said connecting rod for closing said passageway, said connecting lIOd having at least one radially extending arm member engageable with a forwardly facing surface of said piston head for carrying said piston head rearwardly during the return stroke of said piston rod while permitting said passageway to remain open, yieldable cleaning means mounted at the rearward end of said pump chamber, said head portion of said connecting rod and said cleaning means having complementary surfaces engageable adjacent the rearward end of the return stroke of said connecting rod, means for reciprocating said connecting rod and one way valve means disposed in said pump chamber between the discharge opening thereof and said piston head.

7. A pump apparatus comprising at least one pump chamber having a discharge opening and a material supply opening, a piston head having a passageway therethrough slidably disposed within said pump chamber between'the openings thereof, said passageway having rearwardly and forwardly facing conically shaped sections defining :a restriction in said passageway, a connecting rod disposed in said pump chamber, said connecting rod having a head portion receivable within said passageway, said head portion having a forwardly facing surface complementary to and engageable with the rearwardly facing conically shaped section of said passageway during the pump stroke thereof for closing said passageway, said forward portion having a plurality of radially extending Iarm members disposed at the forward end thereof en- .gageable with the forward end of said piston head during the return stroke of said connecting rod rearwardly while permitting said passageway to remain open,a yieldable cleaning member disposed at the rearward end of said pump chamber, said head portion and piston head having complementary surfaces relative to said cleaning member engageable adjacent the rearward end of travel of said connecting rod during the return stroke thereof, means for reciprocating said connecting rod and one way valve means disposed in said pump chamber between the discharge opening thereof and said piston head.

References Cited by the Examiner UNITED STATES PATENTS 307,862 11/1884 Loth 103178 2,065,022 12/ 1936 Poulter. 2,520,242 8/1950 Grau. 2,558,312 6/1951 Nisbet 103178 FOREIGN PATENTS 1,025,983 1/1953 France.

662,293 12/ 1951 Great Britain.

MARK NEWMAN, Primary Examiner.

WARREN E. COLEMAN, Examiner.