US2311561A

US2311561A - Heated mold form

Info

Publication number: US2311561A
Application number: US354972A
Authority: US
Inventors: John A Miller
Original assignee: Wurlitzer Co
Current assignee: Wurlitzer Co
Priority date: 1940-08-31
Filing date: 1940-08-31
Publication date: 1943-02-16
Anticipated expiration: 1960-02-16

Description

Patented Feb. 16, 1943 UNITED STATES PATENT OFFICE HEATED MGLD FORM John A. Miller, ne Kalb, m., assignor to 'rire Rudolph Wurlitzer Company, Cincinnati, Ohio,

a corporation Application August 3l, T1940, Serial No. 354,972

(Si. 14d-256) l. Claims.

Having thus formed the Wooden caul, a series of interconnected steam pipes l are seated along the recesses I2 and are preferably blocked up with any suitable blocking pieces'indicated at It so that said pipes may be temporarily supported substantially in spaced relation. A mass of molten metal I6 is then poured over the pipes so block of wood to substantially the shape desired, v

place a series of steam pipes therein, and provide a male form from a block of wood having the prescribed convex curvature. The Wooden male form is then placed over the female caul and the space surrounding the steam pipes and between their surfaces is then lled with molten'metal, such as babbitt. Themolten metal thus surrounds the steam pipes and provides a forming surface for the female form of the prescribed curvature. The metal, being conductive of heat, readily transmits the heat from the steam pipes to the plywood for highly heating the same as it.is.pressed against the metal surface by the same wooden male form used in shaping such surface.

Other objects and features of the invention will be understood from the accompanying drawing and the following description and claims.

Fig. 1 is a plan view of the mold form with portions broken away to show the metal forming surface in one portion thereof and the heating pipes before the metal is applied, in another portion. Fig. 2 is a side elevation of the female form. Fig. 3 is a central vertical section through the male and female forms preparatory to Introducing molten metal therein. Fig. 4 is a section similar to Fig. 3 through said forms to show them in plywood forming position.V Fig. 5 is a central vertical section showing a modification of thev female form.

In the drawing there is shown a wooden female caul Il which is shaped from a solid or built-up block of wood. Said caul is reinforced by side and bottom` plates I I. The upper surface thereof is routed out to provide a series of spaced recesses I2 with intermittent projections I3 extending that the caul is practically lled therewith, and wherein it will flow into the recesses i2 and around said pipes. .Such metal may preferably be .babbitt or any similar metal which may be Aintroduced in a molten state atv sufficiently low temperature to avoid burning, as-distinguished from perhaps merely charring, the wood caul into which it is introduced.

A wooden male form I1 having a convex curved surface I8 conforming to the prescribed curvature is placed over the molten metal so that said metal is pressed 'firmly about the steam pipes and excess metal is forced from between the caul and male form. The molten metal is then a1- llowed to set and harden, conforming to the curvature of the male form, lafter which it is removed, with the result that the formed metal I6 has been givenY the proper curvature and is in contact with and surrounds the steam pipes so as to readily conduct heat therefrom to such curved surface.

In the above manner ,a female form capable of applying heat is produced in a simple and economical manner ready for use in shaping the plywood veneer. Thereupon a panel of plywood veneer I9 is placed on the metal surface of the female form,steam is introduced into the pipes I4 and the male form I1 is placed thereover. Pressure is thereupon applied to press and form the plywood through the medium of pressing plates 20 which may hydraulically or otherwise exert the desired pressure in the usual and vwell known manner.

As will be noted in Fig. 1, the steam pipes are connected inseries at each of their ends by elbows 2I, one of the pipes having a steam intake opening 22 and another a steam return or ex` haust opening 23.

In Fig. 5 there is illustrated a modied and I .simplified form of female caul III which is provided with a bed having a curved surface I I2 in which a series of steam pipes I Il are laid with ytheir ends interconnecting through the elbows I2 I The steam pipes being thus laid in the caul,

the molten metal IIS is poured thereover and formed-in the manner above described to provide the desired female form.

Whereas the invention has been herein illustrated and described as applied to a form having the metal and steam pipes imbedded in the female member, it is obvious that it is equally applicable to .a form wherein the metal and steam pipes are imbedded in and comprise the male member-or a mere reversal of the structure as herein shown and described.

The invention claimed is:

1. A form for shaping a glue treated plywood veneer panel under heat and pressure, comprising a.A wooden caul, a cast metal forming surface molded therein for receiving said panel, a plurality of heating members imbedded in said metal, and a conforming member adapted to press and conform said panel to said metal forming surface.

2. A form for shaping a glue treated plywood veneer panel under heat and pressure, comprising a wooden caul, a cast metal forming surface molded therein for receiving said panel, a series of steam heating pipes imbedded in said metal, and a conforming member adapted to press and conform said panel to said metal forming surface.

3. A form for shaping a glue treated plywood veneer panel under heat and pressure, comprising a wooden block provided with a concave recessed portion conforming generally to the shape desired, a series of steam heating pipes mounted Within said recessed portion, a cast metal forming surface' imbedded therein and surrounding said pipes, said metal forming surface being of the curvature desired for shaping, and a Wooden male member having a convex surface to mate with the metal surface for pressing and conforming said panel thereto.

4. A form for shaping a glue treated plywood veneer panel under heat and pressure, comprising a wooden block, a series of recesses formed therein separated by outwardly extending walls conforming in general to the shape vof panel desired, sections of steam pipe mounted in each recess and separated by said walls, said sections being connected to provide a continuous steam passageway therethrough, a heat transmitting medium in the form of cast metal surrounding said pipe sections and separating walls to present a forming surface of the desired curvature, and a conforming wooden member having a complementary curved surface adapted Ito press and conform said panel to said metal' forming surface.

' JOHN A. MILLER.