US677261A - Machine for forming insulating-bushings. - Google Patents

Description

Patented lun 25, I90l.

T. PAI

ING LATING BUSHINGS.

n filed Mar. 18, 1901. v

No. 677,26l.

MACHINE FOR FORM (Applicatio UNITED STATES PATENT OFFICE.

HENRY T. PAISTE, OF PHILADELPHIA, PENNSYLVANIAL MACHINE FOR FORMING INSULATING-BUSHINGS.

SPECIFICATION formingpart of Letters Patent No. 677,261, dated June 25, 1901.

Application filed March 18, 1901. Serial No. 51,683. (No model.)

To a whom it may concern.-

Be it known that I, HENRY T. PAISTE, a citizen of the United States, residing in Philadelphia, Pennsylvania, haveinvented certain Improvements in Machines for Forming Insulating-Bushings, of which the following is a specification.

My invention relates to an improved machine for molding sheet material into any desired form, and more particularly to a machine for forming insulated linings or bushings.

It has for its object the provision of a device by which a properly-shaped blank cut from a sheet of material may be held prior to and during the time in which it is being forced into a die by a plunger. This object I attain as hereinafter set forth, reference being had to the accompanying drawings, in which Figure 1 is a perspective view of my improved device. Fig. 2 is a plan view of the same, showing it in position on the plate of a bushing-forming machine. Fig. 3 is a vertical sectional view on the line 3 3, Fig. 2. Fig. at is a vertical sectional view of a modification. Fig. 5 is a side view of the blank from which a bushing is to be formed, and Fig. 6 is a perspective view of a finished bushing.

It will be understood that while I describe my invention as applied to the manufacture of insulating-bushings from sheet fiber the said invention may be used with equal advantage in forming sheet material of any composition into any desired form.

The process hitherto employed in the manufacture of fiber bushings required the raw material to be in the shape of a tube, so that it would remain on a plunger without requiring outside assistance to prevent distortion while the bushing was in process of being formed. By my invention a bushing is formed from a piece of sheet fiber, the blank from which it is shaped being of such form that the complete bushing is smooth and evenly finished at all parts.

The raw material employed is in the form of sheets, which material can be much more efficiently and economically used than the tubing hitherto employed.

In the drawings, A and B are the plunger and die, respectively, of a bushing-forming machine, the plunger being connected to a suitable source of power by mechanism designed to periodically move it into and out of the die. The upper part a of the plunger is made of the same diameter as the part b of the die, while the part a is made less in diameter than this by an amount equal to double the thickness of the material operated upon. The part a is less by a similar amount than the part b of the die, and in operation the part a of the plunger is lowered to a predetermined point, depending upon the dimensions of the bushing to be formed.

A guiding-mold 0, preferably made in two pieces 0 c, hinged together, is held to the upper surface of the die by a bolt 0 which passes through the hinge projections of the said two pieces and is suitably fastened to the die. In the present instance this mold is cylindrical in form, and the opening through it is the same diameter as the part a of the plunger. One of the halves c has a locking-arm d pivoted thereto, in which is a recess d, constructed to engage a projection d from the half 0 when the mold is in its closed position. The bolt 0 is so placed on the die that the mold C may be brought into position on the die in which the opening through it is concentric with the axis of the plunger and of the die. In order that said mold may be retained in this position, I preferably provide a dowel-pin 11 set in the die and projecting slightly above its top surface, there being a recess therefor in each of the parts 0 and c of the mold.

In forming a bushing for the inside of an incandescent-lamp socket, for example, I first stamp or otherwise cut out a piece of fiber E, shaped as shown in Fig. 5, said shape being obtained by the development of a finished bushing. Theplungerbeingraised,thepiece of fiber E is bent by hand into an approximately cylindrical form and placed in said mold; but when a pivoted or hinged former, such as that indicated in Figs. 1 and 2 of the drawings, is used the fiber is placed in the opened former and the latter then closed, by which action the sheet material is bent into cylindrical form. The locking-bar dis moved so that the projection 61 on the half c" of the mold engages with the recess 61 and clamps the mold in its closed position, the various parts of the device being relatively placed as shown in the modification in Fig. at. The appropriate mechanism then causes the plunger A to descend, and the shoulder formed by the enlarged part a thereof engages the upper edge of the piece E and forces it through the mold into thedie B, the said mold guiding it and holding it in position while it is being moved into said die. The plunger enters the die until the shoulder between the parts co and a thereof comes against the material to be formed on the corresponding shoulder between the parts I) and b of said die, after which it is withdrawn.

The mold is opened by throwing over the clamping-bard and swinging the two parts 0 and c on their pivot, after which the finished bushing of the shape shown in Fig. 6 may be removed.

The mold O is not necessarily made in halves, as,-if desired, it may consist simply of a cylindrical piece 0, as shown in Fig. 4;, held pivotally between the arms of a Y- shaped lever F, pivoted at f toa swinging arm-piece F. 0 when moved up or down by the lever F always maintains its axis coincident with that of the plunger and die, there being pins b b in the upper surface of the die for the purpose of retaining it in a fixed position while the machine is in operation. ger being raised, a rolled-up piece of material may be inserted in the mold and the bushings formed as above explained, the mold 0 being raised by means of the lever F to remove the samewhen finished.

It is to be noted that while the bushing formed by my improved machine has a cut up one side where the two edges of the blank come together, by making the said blanks accurately these edges may be made to match perfectly, and the said bushing when inside of a shell of an incandescent-lamp socket has been found to meet all practical requirements, the said out in actual use not having been found disadvantageous.

I do not herein claim the insulating-shell for incandescent-lamp sockets, as hereinbefore described, and shown in the accompanying drawings, as that forms the subject-matter of an application for patent filed by me June 8, 1901, Serial No. 63,682.

I claim as my invention 1. The combination of a die, having in it a cavity greatest in diameter at the top thereof, aplunger constructed to periodically enter said cavity, with a mold made in two parts and constructed to hold a piece of material By this construction the piece tobe molded, means for clamping the parts of the mold together, the plunger when reciprocated passing through the mold and forcing any material therein into the die, substantially as described.

2. A die having in it a cavity largest in diameter at the top, a plunger similar in form to .the opening in the die, a shoulder on said plunger and a former or mold on the die constructed with its internal diameter equal to the diameter of the shoulder on the plunger and also to the internal diameter of the die at the top thereof, substantially as described.

3. The combination of a die, a plunger arranged to travel into said die and having on it a shoulder, a contractible former or mold mounted in front of the die concentricwith the axis of the plunger and constructed to bend a blank of sheet material into cylindrical form, and means for forcing, the plunger, with the blank, through the former and into the die, substantially as described.

4. Thecoinbination in a machine for forming insulating-bushings, of a die, a plunger and a former or mold constructed to bend a piece of sheet material into a cylindrical form, with means for causing the plunger to pass through the mold and to engage the said material, thereby forcing it into the die, substantially as described.

The pluniof two cylindrical sections of difierentdiameter and having also a shoulder larger in diameter than either of the said sections, and

. 5. The combination of a plunger consisting a die having in it a cavity similar in shape to the shape of the sections of the plunger, with a mold or former having through ita cylin- I drical opening equal in diameter to the shoulder on the plunger, substantially as described.

6. The combination of a die, amold or former thereon having through it a cylindrical opening, means for maintaining said mold concentric with the cavity in the die, a plunger provided with a shoulder equal in diameter to the internal diameter of the mold, said plunger having its head of a shape similar to the opening within the die, being constructed to pass through the mold, and to force any materialtherein into the die, sub stantially as described. p

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. H

HENRY T. PAI STE.

Witnesses: WILLIA E. BRADLEY, Jos. H. KLEIN.

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