US814028A - Machine for forming pipe-cores. - Google Patents

Description

No. 814,028. PATENTED MAR. 6, 1906. F. D. DIMMIGK & A. M. FORD. MACHINE FOR FORMING PIPE OORES.

QPLIOATION FILED AUG. 2, 1904. W Q a SHEETS-SHEET 1.

WITNESSES L dMWIEZIZK/a PATENTED MAR. 6, 1906.

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APPLICATION FILED AUG. 2, 1904.

P D DIMMIGK& A M PO MACHINE FOR FORMING PIPE INVENTORS TNAQY \QQBWW QM (mil Rlbext \Fowck ATTORNEY.

IINITEI) PATENT OFFICE.

FREDERICK D. DIMMIOK AND ALBERT M. FORD, OF BIRMINGHAM,

ALABAMA.

Specification of Letters Patent,

Eatented March 6, 1906.

Application filedAugnst 2, 1904;. Serial No. 219,189.

To Cb whom't't mag concern.-

Be it known that we, FREDERICK D. DIM- MICK and ALBERT M, FORD, citizens of the United States, and residents of the city of Birmingham, State of Alabama, have invented certain new and useful Improvements in Machines for Forming Pipe-Cores, of which the following is a full, clear, and complete disclosure.

In the making cores for casting iron and steel pipes of comparatively great length and large diameter it is necessary to form a core which is not only light and easy to handle and of great strength, but which also should be of such a construction to allow the core to be removed from the casting after the same has been formed. Cores of this nature are made in the following manner: first, by winding about a suitable foundation, known as a core-barrel, a covering or layer of hay rope, or a rope composed of strands of twisted hay or in some instances-loose hay, which are wound upon the core-barrel in a sufficient number of turns to form a'considerable thickness of the core. Upon this foundation of hay rope or hay is placed a layer of socalled mud, or a composition of core-sand or of clay, which is allowed to partially harden or dry, and then a second layer of somewhat finer mud or composition is placed upon the first layer, so as to form a smooth surface for the core. The core is covered with a coating of blacking and is then baked or' form of our invention is particularly to provide means for smoothly and accurately supplying the layers of mud or core-sand to the surface of the hay rope, so that the two layers may be applied in one and the same'machine without the necessity of adjustment or measurement as .the different layers are applied and which will act also as a templet to give the required shape to the surface of the core. In previous forms of devices for accomplishing this result after the core-makers had applied the first coat of mud on all of the cores to be made in a single day the cores were put into an oven and dried, after which the cores were ready to have the second coating of mud, which finishes the core applied. In order to be sure that the core was sary for the foreman to adjust the core-board at the beginning of a run of a certain size of cores, after which the different layers of mud may be applied without further adjustment until the end of the run of cores of that size. Briefly, our invention comprises a frame for supporting a hollow iron cylinder 8,

known as the core-barrel, and a pivoted table or core-board which is provided with edges which have a definite axial relation to each other, so that when said core-board is revolved upon its pivots or trunnions said edgeswill correspond, respectively, to the surface of the layers of the mud or core-sand which is supplied to the hay-rope foundation of the core.

Our invention also comprises certain arrangements and construction of parts hereinafter to be more clearly described, and pointed out in the accompanying claims.

For afull, clear, and exact description of our invention reference may be had to the following specification and to the accompanying drawings, forming a part thereof, in which Figure 1 is a plan View of our improved machine Fig. 2, a side elevation thereof; Fig. 3, a transverse sectional viewgFig. 4, a front elevation; Figs. 5 and 6, detailed views of the adjusting means for the edge of the coreboard; Fig. 7, a transverse sectional view of one end of the machine, taken on a vertical plane passing through the edges of the coreboard and its trunnions.

Referring to the drawings, the numeral 1 indicates two side frames or supports, which are preferably composed of a vertical transverse web 2 and a web 3 at right angles thereto, at the top of which is supported a bracket 4, which is adapted to support a hand,-wheel and shaft, hereinafter to be described. The forward portion of the webbing 2 carries a pair of V-shapedways 5, which approach each other at an angle and are adapted to receive a correspondingly-shaped bearing-block 6. The block 6 is provided with semicylindrical bearing-seats 7, which are adapted to receive the spindle or shaft 8 of the core carrier or barrel 8 for the core 9.

The upper edge of the webbing 2, which v forms the support 1, is provided with horizontal webs or tables 10, upon which are adapted to rest adjustable bearings or pillowblocks 11. The bearings 11 are adapted to receive the trunnions 12, which extend from the axis of the core board or table 13.

In order to get the correct and accurate adjustment of the bearings 11,- so as to bring the edges of the core-board 13 nearer or farther away from the axis of the core 9 which is to be formed, we provide slots 14 in the web 10, into which are adapted to extend lugs 15, carried by the base of the bearingblocks 11. The outside of the casingof the bearing -blocks 11 have an extension 16, through which is a screw-threaded opening The screw-threaded opening 17 is adapted to receive a screw-threaded shaft 18, which passes through the upper end of the bracket 4 and carries at its outer extremity a handwheel of the usual form, as indicated at 19. Bolts 20 also pass through the base of the bearing-blocks 11 and the slot 14 and engage with the under surface of the web 10. These bolts are adapted to hold the bearing-blocks in position after the same have been adjusted.

To obviate the use of a measure or rule, we provide the edges of-the tables 10 with scales or indicators 21, which are adapted to cooperate with small pointers 22, carried by the base of the bearing-blocks 11. By this arrangement it will be seen that when the handwheels 19 are turned in one direction or the other the bearing-blocks 11 will be adjusted to and from the axis of the core 9 and the position therefore of the operative edge of the core-board or table 13 may be accurately determined without other measurements.

As means to hold the table or core-board in a horizontal position while operating in connection with the core being formed we provide a pivoted arm 23, which is carried by an adjustable stud 24, located in a slot 25 in the web 2 of the machine. The arm 23 is connected with a substantially horizontally extending arm 26, which carries a counterbalance-weight 27. The upper end of the arm 23 is provided with a notch (indicated at 28) which is adapted to fit over and engage one edge of the table, as indicated at 29. Beneath the notched portion of the arm 23 is a curved projection or arm 30, which is designed to engage the under side of the table or coreboard 13 to act as a stop, and therebyhold the table or core-board 13 at any desired angle of inclination when the edges thereof are not in contact with or operating upon the core be-- ing formed. This arrangement also allows the table 13 to be easily reversed, so that different edges thereof may be brought into operative position in relation to the core 9, and also holds the said table firmly in position without the danger of the parts becoming disengaged during the operation.

The details of the core-board or table may be described as follows: The core-board 13 is preferably in the form of a cast-iron slab or web which is integrally connected thereto to the trunnions or bearings 12, before referred to. is provided with longitudinal flanges 31, which are placed'adjacent one edge thereof, which is the edge opposite to that which is employed in shaping the core. One end of each flange is bent slightly inward toward the axis of the core-board, as indicated at 32. This edge of the board corresponds to that which requires less material, owing to the fact that the end of the core which fits into the opening or recess formed by the coreprint is made tapering or frustum-shaped. Both longitudinal edges of the core-board are provided with auxiliary strips 33, which are adjustably held upon said core board by means of bolts 34 or other suitable fastening means. The strips 33 are provided with transverse slots 35, through which the bolts 34 project and which allow of adjustment in relation to the edges of the core-board 13.

At one end of the core-board we provide other edge pieces 36, which have inclined outer portions the angle of which corresponds to the angle of the inner surface of the recess Each surface of the table or core-board formed by the core-print when the pipe-mold is formed.

It is sometimes desirable that the different portions of one auxiliary edge of the coreboard or table be placed at different distances from the axis of the core shaft or axlethat is, it is desirable at times to bend said auxiliary edge away from thesaid axle, thereby varying the shape of the core by an increase in diameter at its central portion. For this pur ose we provide the following means: On eac side of the core-board 13 we provide a casing 37, which is placed so as to inclose a bolt or screw 38, passing through the web or flange 31. These bolts or screws 38 have a screw-threaded portion which engages a nut 39, fixed in relation to the adjustable edge 33 and preferably attached thereto by the screws 40. The head of the bolt 38 is fixed in position in relation to the web 31 by means of a collar or fixed ring 41. It will now be seen that when the bolt-head 38 is turned in one direction the central portion of the adjustable edge 33 will be moved outward,iwhile if or inward curve, said curve being accurately maintained during the use of the core-board by means of the bolt 34.

The operation of our device may be described as follows: The core-barrel 8 having first been wound with the requisite number of turns of hay rope to give the correct amount of destructible backing for the core, the first mixture of core-composition or mud is placed upon one side of the table or coreboard 13. The core-barrel 8 through the shaft 7 is then turned by any suitable means, and while said barrel with its foundation of hay rope is revolving the core composition is forced from the edge of the core-board, so as to adhere to the revolving cylinder of hay rope. When the said cylinder has reached a size which is limited by the adjustable edge 33 of the core-board, said cylinder will be of the requisite diameter for the first layer of core composition and will be of the required shape, owing to the edge of the core-board acting as a templet. Said core-barrel and core are then removed from the machine and another core-barrel having a hay-rope foundation is inserted in its place. This is treated in the same manner as the first, and so on successively until a sufficient number of cores have been thus given a preliminary treatment. After the first layer of core foundation has become somewhat hardened or dried the core-board or table 13 is reversed by withdrawing the arm 23, so that the notch 28 will disengage the edge of said core-board, and so allow the table or board 13 to be revolved. After the table has been revolved into its reversed position the arm 23 is then allowed to resume its normal position with the notch 28 engaging the edge of said core-board. Owing to the fact that one adjustable edge of the core-board is at a slightly greater distance from the axis of the corebarrel 8 there will be a space between the surface of the core, as first formed, and the edge just brought into position Mud is then applied to the surface of the core in the same manner as in the first instance until the surface of said core is accurately formed by the second edge 33. While the core 9 is still revolving the lever 23 is moved from its normal position, so that the notch 28 is disengaged from the edge of the table 13, thereby allowing the table to tip so that the edge adjacent the core will move upward, which will remove the surplus mud which would still have a tendency to adhere to the core 9. The edge 33 of the table 13 is then cleaned, and said table is then allowed to resume its normal horizontal position, and while the core is still being revolved a thin coating of blacking is applied to its surface. The table 13 is then tilted upward in thesame manner as before, which similarly removes the surplus blacking, leaving the core 9 symmetrical and with a smooth finished surface. The

core 9 may be now lifted from its bearings 7 and placed in a suitable place to dry. This gives a core of the requisite surface, diameter, and shape, and after drying the same is ready for use in connection with the pipe-mold. It is obvious that for cores for pipes of small diameter the hay or hay rope may be Wound directly on the shaft or axle 7.

It will be noticed that one of the advantages of this machine is that a large number of pipe-cores may be treated at the same time, with the assurance that each one will be of the same diameter and shape, and each will have its surface accurately true. Another advantage of this manner of forming pipe-cores resides in the fact that the layers applied to the hay-rope foundation are of uniform thickness, and therefore subject to the same amount of contraction in drying or hardening and with less liability of crackin Having thus described our invention, 1t will be apparent that changes may be made in the form and proportion and arrangement of parts, and the use of mechanical equivalents may be employed therein without departing from the spirit and scope of our invention; but

What we claim, and desire to protect by Letters Patent of the United States, is

1. In an apparatus for forming pipe-cores, the combination of a core-carrier and a reversible core-board pivoted adjacent said corecarrier so that each longitudinal edge thereof will form a guide in the turning or forming of said core.

2. In an apparatus for forming pipe cOreS, the combination of a core-carrier and a reversible coreboard pivoted on an axis parallel to said carrier and adapted to hold the material to be applied to said core, and also to form a templet in the turning or forming of said core.

3. In an apparatus for forming pipe-cores, the combination of means for supporting a rotary core-carrier, a reversible table or coreboard pivoted on an axis parallel to said carrier, said core-board having opposite edges, which are of different distances from said axis, so that the surface of the layers of the core material may be formed on the core at difierent diameters.

4. In an apparatus for forming pipe-cores, the combination of means for supporting a core-carrier, a reversible core-board pivoted adjacent said core-carrier, said core-board havin edges at different diameters from the axis 0 said carrier when the core-board is reversed, and means for holding said board in horizontal position with either of its sides uppermost.

5. In an apparatus for forming pipe-cores, the combination of two transverse supports having core-axle bearings, a core-barrel supported by said bearings, a reversible table or core-board also having bearings in said support, and a weighted, notched arm pivoted in relation to said supports, and adapted to engage said table or core-board to hold the same in position with either side uppermost;

6. In an apparatus for forming pipe-cores, thecombination of a core-carrier, transverse supports having bearings therein for the car rier axle transverselyadjustable bearings also carried by said supports, a reversible table or core-board pivoted to last-mentioned bearings, and means for moving said bearings transversely toward and from said core-axle bearings.

7. In an apparatus for forming pipe-cores, the combination of a core-barrel, a table or 'coreboard supported adjacent the same with an edge substantially parallel thereto, said edge comprising an adjustable strip, and means intermediate the ends of said strip for bending the same inward or outward.

8. In an apparatus for formin pipe-cores, the combination of a core-barre a table or core-board supported adjacent the same with an edgesubstantially parallel thereto, said edge comprising an adjustable strip, and means at the central portion of said strip for bending the same inward or outward.

9. In an apparatus for forming pipe-cores, the combination of a core-carrier, a reversible table or core-board supported adjacent the same with its edges substantially parallel thereto, said edges comprising adjustable strips, and adjusting-screws connecting said table or core-board and said strips and 10- cated at the central portions of the latter, for

bending the same inward or outward.

In testimony whereof we have hereunto set our hands this 28th day of July, 1904.

Witnesses:

JULIA Fv CLAYTON, G. O. WILLIS.

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