US491757A - Sectional brush-mold - Google Patents

Description

(No Model.)

W. MORRISON.

SEGTIONAL BRUSH MOLD. i

No. 491,757. Patented Feb. 14, 1893` UNITED STATES PATENT OFFICE.

W'ILLIAM MORRISON, OF LANSNGBURG, NEW YORK.

SECTIONAL BRUSH-MOLD.

SPEGIFICATON forming part of Letters Patent No. 491,757, dated February 14, 1893. Application filed May 26, 1892. Serial No. 434,407. (No model.)

To all whom t may concern:

Be it known that I, WILLIAM. Monnrsorna citizen of theUnited States, residing at Lansingburg, county of Rensselaer, and State of New York, have invented certain new and useful Improvements in Sectional Brush-Molds, of which the following is a specification.

My invention relates to such improvements and consists of the novel construction and combination of parts hereinafter described and subsequently claimed.

Reference may be had to the accompanying drawings, and the letters of reference marked thereon, which form a part of this specification.

Similar letters refer to similar parts in the several iigures therein.

Figure 1 of the drawings is a vertical central longitudinal section of my improved mold for forming brushes, with a brush inclosed in process of manufacture. Fig. 2 is a vertical cross-section of the same taken on the broken line, 2-2, in Fig. l, through that portion of the mold which forms the handle of thebrush. Fig. 3 is a top plan view of the middle plate of my improved mold, detached.

My invention relates to improvements in brush-molds for forming of plastic material, a bristle-supporting headblock and a laterally projecting handle integral with the headblock.

The objects of my invention are to facilitate the removal of the laterally projecting handles from the molds without breaking them from the headblocks, and to permit the brushes to be removed from the molds at a comparatively high temperature.

The mold comprises the base-plate or section, A, the crown plate, B, and the middle-plate, C, each of such sections or plates being provided with a plurality of similarly located apertures adapted to receive the steady-pins, D, for holding the sections in exact position relatively to each other.

The crown-plate, B is recessed on its inner side, BL to conform to the shape of the top surface and upper side edge of the head and handle of the molded brush. The walls of such recess may be provided with any design, sunken or in relief, with which it is desired to ornament the back of the brush.

,nally of the plate.

The middle-plate, C-, is provided Vwith a brush-head aperture and a handle-aperture continuous therewitli,which together form the elongated aperture, O-, extending longitudi- The wall of such aperture is similar in outline to the molded brush,and is preferably provided along its upper edge with a peripheral groove or chamfer, (l2- adapted to underlie the entire peripheral edge ofthe head and laterally projecting handle of the molded brush.

The base-plate, A, is provided with a raised portion or table, A- having at one end a plurality of recesses, A2# to receive and support the bristles with their upper ends in the head aperture in the middle-plate, in a position to be embedded in the plastic material of which the brush is made. The other end of the table, A- forms a molding surface or table projecting laterally from the bristle-supporting table and continuous therewith; and is adapted to close the lower side of the handle-aperture in the middle-plate and form the face of the laterally projecting handle of the brush.

The operation is as follows: The base-plate is first prepared by the insertion of the bris tles, ain the recesses, A2- in the head end of the table, A. The bristles are then trimmed to project uniformly above the surface of the table the distance it is desired to have them embedded in the brush-head. A small quantity of the plastic composition of which the brush is to be formed is then worked by hand between and around the projecting ends of the bristles, after which the middleplate is superimposed upon the base-plate, the bristle-supporting table fitting the lower part of the head-apertu re in the middle-plate, and the laterally extending molding table on the base-plate fitting and closing the lower part of the handle-aperture in such middleplate. The head and handle apertures are then filled with the melted or partly melted composition which is rounded up in approximately the form of the completed brush, and the crown-plate, B-, superimposed upon the middle-plate. The mold is then complete and is placed in a press until the composition sets or hardens, when the brush, bmay be removed while yet comparatively hot.

IOO

fthe base-plate carrying with it the molded brush, and withdrawing the bristles from their recesses in thebase-plate table. The brush is then supported only on its periphery by the middle-plate, and maybe easily and safely removed from such plate by means of the hand or any suitable instrument inserted through the plate aperture from below.

I am aware that a mold formed of three or more sections is not broadly new, and that the middle-plate of such a mold has been' providedwith `ahead-aperture to permitthepassage of the bristles; but in'all molds adapted to form a laterally-projecting handle upon a tion of the middle-plate was c'losedvon its under side,` as indicated by dotted line, d-,\in Fig. 3,` making the under side'of the handle inaccessible to remove it from the middleplate after such plate had been lifted from the base-plate.l I/Vhen so constructed, it is necessary to Wait till the heated compositionl has cooledland contracted beforeit is safeto attempt to remove the brush from such middle-plate; and even when fullyv cooled the head-block by theadherence of the compost By providingthe middie-plate with a handle aperture, the handle is accessible from the under side throughout its length and can be pressed upwardlyawayfrom itss'eat in the mid-4 dle-plate by a suitable instrument applied at the exact point of the adherence'of thecomposition tothe plate. I thus avoid all danger ofy breakage'and can remove'the brush from the mold as soon as the composition has set, Without Waiting for the composition and mold necessary in the manufacture of molded handle-brushes.

It is well known" to those skilled in the art the fillets formed thereby will occur along the exposed edges of the brush, in a position easy of access Where they can be removed without .distiguring t-he brush. As heretofore constructed with the handle portion of the mid dle-plate closed on its under side, a crack was formed in the mold transversely of the brush `at the junction of the projecting handle with the head-block, resulting in the formation of a fillet across the face of the brush at this point. The surface of the brushon either side of thisllet is usually flat and unornamented, i making the removal of the fillet difficult, and rendering the mars causedby itsremoval conspicuous.

bristle-supporting head-block, the handle por- By forming a handle aperture continuous with thehead-aperture in the middle-plate of my improved mold, and providing thebaseplate with a handle-molding table continuous with the bristle-supporting head-table, I am 'able to avoid the formation of a fillet across the face of the brusl1,lall the joints of the mold-sections being located along the exposed edges of the brush, in which position they can be most easily removed, with least finjury to the brush.'

handle is frequently broken from a brush Y `by Letters Patentis tion to the inner surface of the middle-plate.

What I claim as new and desirefto secure A sectional'mold for l1andlebrushes,com prising a crown-plate, a middle-'plate having ja brush-head-aperture and aliandle-aperture continuous thereWith,-and a base-plate hav- 1 ing a-recessed tablelforsupporting the bristles fin the head-aperture, and ahandle-molding table, continuous with therecessed table and closing the bottom of the handle-aperture,

substantially as described.

In testimony whereof I have hereunto set i my hand this 19th day ofiMay, 1892. to become cold, whereby I save a large por- 1 tion of theV time which has heretofore been WILLIAM MORRISONl Witnesses:

FRANK C. CURTIS, A. E. DELANEY.

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