US1803478A

US1803478A - Method of jigging and doweling patterns

Info

Publication number: US1803478A
Application number: US287315A
Authority: US
Inventors: Arthur K Laukel
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-06-21
Filing date: 1928-06-21
Publication date: 1931-05-05
Anticipated expiration: 1948-05-05

Description

May 5, 1931. I LAUKEL 1,803,478

METHOD OF JIGGING AND DOWELING PATTERNS Filed June 21, 1928 Patented May 5, 1931 UNITED STATES ARTHUR K. LAUKEL, OF J JETROIT, MICHIGAN IlltlIIilTHOLD F JIGGING AND .DOWELIN G PATTERNS Application filed. June 21, 1928. Serial No. 287,315.

The present invention pertainsto a novel method of jigging and doweling patterns, machining the parting surfaces and filing off the burrs, particularly patterns made by electrolytic deposition by the means described in my copendingapplications. Such deposited patterns are made on suitably shaped cathodes in an electrolytic bath, and preferably in the formof half sections or angular partings which must be trimmed and matched in order to form a complete pattern.

The objects of the invention are to provide jigs for holding the half sections during machining of the parting surfaces thereof,'to

match the sections and dowel them together by means of the jigs, and finally to file or grind the edges at the parting surfaces of two sections at one time while doweled together.

The invention is fully disclosed by way of example in the following description and in the accompanying drawings; in which Figure 1 is a plan view of a box in which a split section of the working pattern is mounted;

Fig. 2 is a longitudinal section thereof,'

the box being filled with plastic material packed around the pattern section;

Fig. 3 is a similar sectional view showing the same plastic material and pattern inverted, and a superposed matched pattern section also embedded in plastic material;

Fig. 4 is a longitudinal section of the lower east in Figure 3, with a depositedpattern section inserted therein; I

Fig. 5 is a similar sectional view of the upper cast of Figure 3, inverted, and having a deposited pattern section fitted therein;

Fig. 6 is a sectional viewcorresponding to Figure 4 and showing the deposited pattern section trimmed on its parting face;

Fig. 7 is a sectional view corresponding to Figure 5 and showing the deposited pattern section trimmed on its parting face;

Fig. 8 is a sectional view showing one of the trimmed pattern sections and its cast superposed over the other pattern section and cast;

Fig. 9 is a perspective View of one of the pattern sections prior to being trimmed;

Fig. 10 is a sectional. view of the pattern prior to filing or scraping off the burrs; and

Fig. 11 is a perspective view of the compjlpt'e deposited pattern with the burrs filed 0 Reference to these views will now be made by use of like characters which are employed to designate corresponding parts throughout.

In Figures 1 and 2 is illustrated a base plate 1 on which is mounted an enclosingwall 2 forming a box.

A section 30f a split working pattern is laid upon the base and is suitably apertured as at 4 to receive dowel pins extendingfrom the remaining section; Such sections are formed by merely splitting the pattern in a manner Well known in the art, and will be referred to throughout the specificationand claims as split sections. 7

On the base 1, preferably at theends of the section 3,-are laid socket of female members 5 having their'openingsat the base. The enclosure is now filled with plastic material 6, such asplaster, packed around the mem-- ber 3 in order to form a depression 7 which is a true and accurate counterpart of theouter surface of the section 3. At the same time the socket members 5 are also embedded in the plastic materiaL- l 1 When the material 6 has set, the base plate 1 may be removed, and the cast with its associated parts is inverted as in Figure 3 and obviously supported in this position by any suitable means. The remaining split section 8 of the working pattern is superposed on the section 3 and is matched or aligned therewith by means of dowel pins 9 which extend into the apertures 4 previously mentioned, and which are so related to the apertures 4 as to match or align the pattern sections.

The doweling of pattern sect-ions for the purpose of bringing the sections into proper mutual relation, is well known in the art or with their parting surfaces coincident, and the positioning of the sections in this relation is hereinafter referred to as aligning or matching.

Studs 10 are fitted into the sockets 5, a wall 11 is placed over the wall 2, and the enclosure thus formed is filled with plastic material 12 which is packed around the

members

8 and 10 in the manner already described. When the material 12 has set, the casts are separated and, with the parting face of the section therein as a supporting surface, the

backs

6 and 12 thereof are planed or machined off parallel to the parting planes. This operation may be performed, for example, in a milling machine. The

split sections

3 and 8 of the working pattern are now removed, but the locating

elements

5 and 10 are allowed to remain.

Into the depressions of the two casts are fitted metallic pattern sections 13 of external dimensions equal to those of the

sections

3 and 8. These sections are formed by electrodeposition on cathodes having depressions identical to those in the casts and rendered conductive in the manner set forth in my prior patents and applications. In fact the electrodes may be duplicates of the casts, but with the depressions and adjacent areas rendered conductive. The sections 13 have each an outwardly extending flange 14; formed at a conductive area around the depression. It will be obvious that the sections 13 will fit accurately into the depressions in the casts. The sections 13 are filled with a suitable low fusing metal 15, preferably before being put into the casts, for the purpose of reinforcement.

After the sections 13 have been positioned in the casts, the casts are employed as jigs for machining oi the parting surfaces, preferably in parallelism with the backs 6 and 12'. In this manner the flanges 14 are trimmed down to the level of the parting or depressed faces 17 as shown in Figures 6 and 7. If amilling machine has been used in levelling off the

backs

6 and 12, the casts or jigs may be put into the same machine, with the same adjustment, but resting on the backs so that the depressed faces are presented to the cutter.

The operation of the cutting tool forms a marginal burr or wire edge 18 at the parting face of each metal section, and this burr is accommodated in a groove 19 formed in the cast prior to the insertion of the metal section 13 therein.

The casts are now superposed one over the other so that the studs 10 enter the sockets 5 as shown in Figure 8. Due to the fact that the

working pattern sections

3 and 8 were matched at the same time that the stud-s 10 entered the sockets 5 in Figure 3, the registration of the studs with the sockets in Figure 8 brings the deposited sections 14 also in alignment. WVhile the sections are aligned, a hole 21 is drilled through each, and dowel pins 22 are fitted into the holes to maintain the sections in alignment after they have been removed from the casts. If preferred, a larger hole 23 may be drilled in the upper cast prior to drilling the holes 21. While doweled together the patterns are given whatever machining operations may be necessary, consisting for the most part of filing or scraping off the burrs or wire edges. By this means, both pattern sections have their burrs removed in a single operation, and there is no danger of rounding off the parting edges as would be the case if the pattern sections were singly filed or ground.

Figure 10 shows the aligned metal sections removed from the cast and held in proper relation by the dowel pins 22' prior to removal of the burrs, while Figure 11 shows the sections in the same relation but with the burr removed.

It will be evident from the foregoing that the casts are used as jigs in which the pattern sections are mounted for levelling off the parting surfaces and dowelingthe sections together. It is to be remarked in this connection that the electrolytic process of making patterns, by the means described in my copending applications, is so accurate that one jig may be used for any number of patterns 7 reproduced from a given working pattern.

Plaster of Paris is used in forming the cast or jig when the pattern is fairly large, or when only a small number of patterns are to be machined. For a large number of patterns a plaster jig would probably not stand repetitious use, and in such instances a low melting white metal jig is made. If the model working pattern is of white metal or wood, it cannot very well be covered with molten white metal to form a cast; and if in such cases a metal jig is wanted, it is made from one of the metal patterns produced by the electrolytic process. A white metal jig is also preferable when a large number of large patterns are to be machined.

The term cast throughout the claims refers to the body, whether plaster or white metal, in which the pattern section is held while being trimmed.

Although a specific embodiment of the invention has been illustrated and described, it will be understood that various alterations in the details of construction may be made with out departing from the scope of the invention as indicated by the appended claims.

What I claim is 1.7 A method of jigging and trimming patterns consisting in forming impressions of split and aligned sections of a working pattern in casts equipped with aligning means, removing said sections from the depressions and placing in said depressions thus formed, metallic pattern sections of similar exterior dimensions to the working pattern sections, and trimming the parting surfaces of said metal sections while in the casts.

2. A method of doweling patterns consisting in forming impressions of split and aligned sections of a working pattern in casts equipped with aligning means, removing said sections from the depressions and placing in said depressions thus formed metallic pattern sections of similar exterior dimensions to the working pattern sections, trimming the parting surfaces of said metal sections while in the casts, superposing one of said casts over the other in alignment, with the metal sections contained therein, and forming aligning means in said metal sections while superposed and in the casts.

3. A method of doweling patterns consisting in forming impressions of split and aligned sections of a working pattern in casts equipped with aligning means, removing said sections from the depressions and placing in said depressions thus formed metallic pattern sections of similar exterior dimensions to the working pattern sections, trimming the parting surfaces of said metal sections while in the casts, superposing one of said casts over the other in alignment with the metal sections contained therein, and drilling dowel holes through said metal sections while thus superposed and in the casts. we

4. A method of doweling patterns consisting in forming impressions of split and aligned sections of a working pattern in casts equipped with aligning means, removing said sections from the depressions and placing in said depressions thus formed electrolytically deposited pattern sections of similar exterior dimensions to said working pattern sections, trimming the parting surfaces of said deposited sections while in the casts, superposing one of said casts over the other in alignment, with the deposited sections contained therein, and forming aligning means in said deposited sections while superposed and in the casts.

5; A method of jigging patterns consisting in forming impressions of split'and aligned sections of a working pattern in casts equipped with aligning means, levelling the backs of the casts to parallelism with the parting plane of said sections, removing said sections from the depressions thus formed, and placing in said depressions metallic shell pattern sections of similar exterior dimensions to the Working pattern sections.

6. A method of doweling patterns consisting in impressing a split section of a working pattern in a plastic cast, superposing another split section on the first section and in matched registration therewith, forming a cast around said superposed section and aligning said cast ing in impressing a split section of a working pattern in a plastic cast, superposing another split section on the first section and in matched registration therewith, forming a cast around said superposed section and aligning said cast with the first named cast, separating the casts when set and removing said pattern sections therefrom, inserting in the impressions electrolytically deposited split pattern sections of the same exterior dimensions as said working pattern sections, trimming said deposited sections on the parting surfaces while in the casts, matching said casts while the deposited sections are contained therein, and forming aligning means in said deposited sections while superposed and in the casts.

8. A method of doweling and trimming patterns consisting in forming impressions of split and aligned sections of a working pattern in casts equipped with aligning means, removing said sections from the depressions thus formed and placing in said depressions metallic shell pattern sections of similar exterior dimensions to the working pattern sections, trimming the parting surfaces of said metal sections while in the casts, superposing one of said casts over the other in alignment with the metal sections contained therein, doweling the sections together while superposed and in the casts, and trimming the parting edges of said sections while doweled together.

9. A method of doweling and trimming patterns consisting in forming impressions of split and aligned sections of a working pattern in casts equipped with aligning means, removing said sections from the depressions and placing in said depressions thus formed electrolytically deposited pattern sections, trimming the parting surfaces of said deposited sections while in the casts, superposing one of said casts over the'other in alignment, with the deposited sections contained therein, doweling the sections together while superposed and in the casts, and trimming the parting edges of said sections while doweled together.

10; A method of jigging patterns consisting in forming impressions of split and aligned sections of a working pattern in casts, inserting aligning means in said casts during the formation thereof, removing the sections from the depressions thus formed, and placing in said depressions metallic pattern sections mensions as said working pattern'sections,

trimming said metal sections on the parting surfaces while in the casts, matching said casts while the metal sections are contained therein, and forming aligning means in said metal sections while superposed and in the casts.

7. A method of doweling patterns consist-