US2646606A

US2646606A - Rubber core mold

Info

Publication number: US2646606A
Application number: US115481A
Authority: US
Inventors: Horace H Easterday
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-09-13
Filing date: 1949-09-13
Publication date: 1953-07-28
Anticipated expiration: 1970-07-28

Description

y 8, 1953 H. H. EASTERDAY 2,646,606

RUBBER CORE MOLD Filed Sept. 15,- 1949 /2 I INVENTOR. '7' v Yo X77 lam/ 77i 6 a 7 62 A TTo/PA/E Patented July 28, 1953 UNITED STATES PATENT OFFICE RUBBER CORE MOLD Horace H. Easterday, Thermal, Calif.

Application September 13, 1949, Serial No. 115,481

I This invention relates to the construction of el- "bow passages in concrete or other cast material. The invention is particularly useful in the construction of meter stand bases for use in irrigation lines and other water conduit systems in which water is metered. The use of a smoothwalled, rounded elbow passage leading from a horizontal inlet to a vertical throat communicating with a water meter, is considered essential to the proper functioning of a conventional irrigation water meter. Segmental forms have been used for casting such rounded elbow passages, but

7 of my invention is to provide an apparatus for precasting rounded elbow passages in plastic material such as concrete, at a 10W unit cost and with satisfactory design and wall finish in the passage.

, In general, the invention attains this by utilizing a collapsible core mold and a series of steps in which the core mold is installed in the overall mold for the stand base, is then rigidified by filling it with water, and, after a concrete' base has been cast around it, is drained, is collapsed and is then stripped from the casting by pulling it, in collapsed form, through the elbow passage that t has been cast around it,

A further object of the invention is to provide, for the forming of elbow passages, an improved core mold which can be readily stripped from the passage that has been formed around it. Another object is to provide such a core mold having relatively simple, yet efiicient means for attaching its ends to an outer mold and for injecting and ejecting water and air into and out of the same. A particular aspect of the invention involves the provision of common means for both attaching the core to the outer mold and for injecting and ejecting, such means being in the form of threaded tubular nipples or valve stems which function both as fluid connections and as attachment means.

Other objects will become apparent in the ensuing specification and appended drawings in which 4 Claims. (Cl. 25 118) Fig. 1 is a vertical sectional view of a meter stand base constructed in accordance with the invention;

Fig. 2 is a sectional view showing the use of my improved core mold in casting a rounded elbow in the base;

Fig. 3 is a front view of the core mold;

Fig. 4 is a detail sectional View of a modified form of the core mold;

Fig. 5 is a fragmentary end view of the same.

. Referring first to Fig. 1, which discloses a 3CFS meter stand base designed by the U. S. Bureau of Reclamation, a water meter 5 has its throat supported in a vertical position on and communicating with a vertical pipe 6 the lower end of which is mounted in a concrete base 1. Water enters the base I through a horizontal pipe 8 and reaches the vertical pipe 6 through a rounded elbow passage 9 cast into the base 1. After passing through the. meter 5 it spills out into the dome I0 of the meter stand and makes its exit through an elbow passage l l in the base I, communicating with a horizontal pipe I2. While the elbow passage H may be of a sharp, right-angled design as shown (which makes it possible to use two straight core sections which come together on a 45 degree bias and may be pulled separately from the base that has been cast around them) the elbow passage 9 must be of an arcuate design, with smooth rounded walls, in order that the water fiowingthrough the meter may register accurately therein. Ac-

cordingly, a core mold utilized for shapin the passage 9 must be a unitary one, and the invention therefore provides a collapsible core mold shown in Fig. 4, the ends I5 are extended to form flanges l1.

Secured in the ends [5 are tubular nipples H3. The nipples l8 are vulcanized into the end walls [5 so as to be fluid tight and securely anchored therein. Normally the ends of nipples l8 are closed by caps 18 threaded thereon.

The base 1 is cast in inverted position. In

order to form the smooth, iiat upper wall 19 thereof, it is cast against a bottom plate 26 which has an annular bead 2i for shaping in the base I the annular groove 22 which receives the ring of bonding material 23 joining the base I to the dome Ill, in the finished meter stand. To shape the lateral wall of the base I, there is employed an annular lateral form 24 which is arranged with its open lower end registering with the periphery of bottom plate '28. Bottom plate 26 and lateral form 24 cooperatively constitute an outer form. They are provided with openings 25 through which the nipples 18 are passed. The core mold I3 is secured to the outer form by means of nuts 25 which are threaded onto the nipples it and into engagement with the bottom plate 2e and lateral form 24 respectively. Attempts to support the core mold in other ways have not proven satisfactorythe ends i tending to gap away from the walls of the outer mold form. By attaching them to the walls of the outer form, they are maintained securely in register with the outer form walls, and the remainder of the core "mold is accurately positioned and shaped. Also, the seepage of concrete between the end walls i5 and the walls of the outer mold is avoided, and the extremities of the elbow passage 9 are formed with clean lines of joinder with the outer walls of the base I.

After the core mold is thus attached to the outer ft'il'rii, it is filled with water 2'? in order to impart to it a rigid, non-collapsible state. This is accomplished by applying to one of the nipples 1B the end of a water hose 28, and opening one of the other nipples so as to bleed air out of the core mold as the water is injected thereinto. In order that all of the air may be discharged most readily, the V uppermost nipple is preferably opened, and the water is injected into the lowermost nipple of the series at the upper end of the core mold. Caps I8 are then applied to the ends of the open nipples 18, to close them In order to secure the pipes t and 8 in the concrete base, the base is provided with enlarged bell mouths 29 at the extremities of elbow passage 9. These bell mouths are formed by collars 30 which surround the cylindrical ends l6 of tube member M. 'The collars 313 are provided with carriagebolts 30' which extend "through appropriately located openings in the base plate and lateral form '2'! and are secured by nuts The outer walls or collars at are frusto conical in order to impart the desired shape to hell mouths '29, and also in order that they may be readily withdrawn from the base 1. The collars -33 are inserted over the ends of the core mold 13 before the ends 1 5 are attached to the 'outer form. This may be accomplished by collapsing the ends of the core mold and inserting them through the collars 30.

When the "form has been made ready, concrete is poured therein and allowed to set. After it has hardened suili'cie'ntly all caps l8 and nuts 25 and at" beneath p1ate'20 are removed. At this point, it may be noted that the bottom plate is suitably supported by legs or other means 31 at a sumcient height (e. g., 6") above the ground to give access 'to the nipples and carriage bolts. The nuts 26 and 3%" in contact with lateral form 24 are then removed, and the cap 18 of an adjacent nipple I8 is removed to allow air to enter the core mold I-3, thereby causing the water to drain from the core mold.

Lateral fer-m 24 is then removed, base 1 is raised vertically about six inches, and base plate 29 is knocked loose and removed. Base 1 is then hoisted, using a suitable crane or other hoistin means, is moved to approximately the position it is to finally occupy, and is set down, right side up as in Fig. l, with the end adjacent nipples l8, propped up. With a suitable pole or equivalent instrument, the upper end of core mold I3 is then pushed downwardly into the passage 9, exhausting its contained air, collapsin it, and thus loosening it from the wall of passage 9. It is then pushed through the open end of the passage 9 at the side of base I (where pipe 8 is to be connected). This step may be facilitated by having an assistant exert a pull against the nipples H3 at the lateral end of the core mold.

Fig. l illustrates how, instead of nipples l8, the valves [8a. may be employed as fluid connections. Such valves may also be utilized in connection with nuts 25 as means to attach the ends of the core mold to the form. Alternatively, the valves (or nipples 18 of Fig. 2) may function merely as fiuid connections, and the ends of the core meld may be secured by the engagement of collars 38a with flanges ll of the core mold. Flanges H are provided with notches I? to receive carriage bolts '33, the latter functioning to clamp flange ll tightly between collar 3fia and the forms 20 and 24.

The advantage where flange i1 is 'used is to make it possible to utilize the carriage bolts to hold the ends of the core mold.

The above applies to factory casting and striping. The meter stand may be cast at the permanent site of operation or use, in which case core mold 'i may be positioned to correspond "to the position of passage 9 in Fig.1. Stripping may be the same as above described.

I claim:

1. A mold for casting a concrete meter stand base having a quarter circular elbow passage therein for joinin irrigation pipe lines, comprising: a bottom plate for forming the upper surface of said stand base, a side form for forming a side surface of the base, said bottom plate and side form each having an inwardly project ing collar, with a cylindrical inner wall and a 'fru'sto-conical outer wall, and each having a plurality of apertures disposed within the confines of the respective collars, a collapsible core including a tubular body of 'quarter' circular 'L- shape and end members closing the respective ends of said tubular body, respective ends of said core being receivable and adapted to closely fit within respective collars, threaded studs sealed and anchored in said end members and positioned for extension through respective ones of said apertures when said ends of the core are received in the respective collars, and nuts threaded on the respective studs and operable to clamp said bottom plate and side form against said and members, at least two of said studs being in the form of tubular stems, whereby water may be injected into said core through one of said stems while air is bled from the core through the other of "said stems, said core functioning to form, in said stand base, a quarter circular L"-shaped passage, and said collars functioning to rural,

said stand base, at the respective ends of said L-shaped passage, annular recesses coaxial with said passage ends and adapted to receive 'ends of pipe sections to be joined to said stand base, and to receive rings of sealing material around said pipe sections.

2. A mold for casting a concrete meter stand base having a quarter circular elbow passage therein for joining irrigation pipe lines, comprising: a bottom plate for forming the upper surface of said stand base, a side form for forming a side surface of the base, said bottom plate and side form each havin an inwardly projecting collar, and each having a plurality of apertures disposed within the confines of the respective collars, a collapsible core including a tubular body of quarter-circular L-shape and end members closing the respective ends of said tubular body, respective ends of said core being receivable and adapted to closely it within respective collars, threaded studs sealed and anchored in said end members and positioned for extension through respective ones of said apertures when said ends of the core are received in the respective collars, and nuts threaded on the respective studs and operable to clamp said bottom plate and side form against said end members, at least two of said studs being in the form of tubular stems, whereby water may be injected into said core through one of said stems while air is bled from the core through the other of said stems, said core functioning to form, in said stand base, a quarter circular L-shaped passage, and said collars functioning to form, in said stand base, at the respective ends of said L-shaped passage, annular recesses coaxial with said passage ends and adapted to receive ends of pipe sections to be joined to said stand base, and to receive rings of sealing material around said pipe sections.

3. A mold for casting a concrete meter stand base having a quarter circular elbow passage therein for joining irrigation pipe lines, comprismg: a bottom plate for forming the upper surface of said stand base, a side form for forming a side surface of the base, said bottom plate and side form each having an inwardly projecting collar, and each having a plurality of apertures disposed within the confines of the respective co1 lars, a collapsible core including a tubular body of quarter-circular L-shape and end members closing the respective ends of said tubular body, respective ends of said core being receivable and adapted to closely fit within respective collars, threaded studs sealed and anchored in said end members and positioned for extension through respective ones of said apertures when said ends of the core are received in the respective collars, and nuts threaded on the respective studs and operable to clamp said bottom plate and side form against said end members, at least two of said studs being in the form of tubular stems, whereby water may be injected into said core through one of said stems while air is bled from the core through the other of said stems, and caps adapted to be fitted onto said threaded ends of the stems to close them against escape of water from said core, said core functioning to form, in said stand base, a quarter circular L-shaped passage, and said collars functioning to form, in said stand base, at the respective ends of said L-shaped passage, annular recesses coaxial with said passage ends and adapted to receive ends of pipe sections to be joined to said stand base, and to receive rings of sealing material around said pipe sections.

4. A mold for casting a concrete meter stand base having a quarter circular elbow passage therein for joining irrigation pipe lines, comprising: a bottom plate for forming the upper surface of said bottom plate and side form each having an inwardly projecting collar, and each having a plurality of apertures disposed within the confines of the respective collars, a collapsible core including a tubular body of quarter-circular L-shape and end members closing the respective ends of said tubular body, respective ends of said core being receivable and adapted to closely fit Within respective collars, threaded studs sealed and anchored in said end members and positioned for extension through respective ones of said apertures when said ends of the core are received in the respective collars, and nuts threaded on the respective studs and operable to clamp said bottom plate and side form against said end members, at least two of said studs being in the form of tubular stems, whereby water may be injected into said core through one of said stems While air is bled from the core through the other of said stems, and an annular bead on said bottom plate, surrounding the collar thereon, for impressing in the upper face of said stand base an annular sealing groove to receive a ring of sealing material attaching the stand base to a tubular housing member to be supported thereon, said core functioning to form, in said stand base, a quarter circular L-shaped passage, and said collars functioning to form, in said stand base, at the respective ends of said L-shaped passage, annular recesses coaxial with said passage ends and adapted to receive ends of pipe sections to be joined to said stand base, and to receive rings of sealing material around said pipe sections.

HORACE H. EASTERDAY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 400,308 Cranmer et a1 Mar. 26, 1889 857,582 Boyle June 25, 1907 1,246,404 Dunning Nov. 13, 1917 1,552,064 Lake Sept. 1, 1925 1,566,903 Durst Dec. 22, 1925 1,600,353 Nose Sept. 21, 1926 1,619,362 Murray Mar. 1, 1927 1,624,704 Adams Apr. 12, 1927 FOREIGN PATENTS Number Country Date 609,209 Great Britain Sept. 28, 1948 638,360 France 1928 65,491 Switzerland 1913