US1657121A - Brush - Google Patents

Description

Jan. 24,1928. 1,657,121

A.--V. HART ET AL BRUSH Filed April- 4. 1925 til Patented Jan. 24, 1928.

UNITED new SEY... Aswan s BQ YI L ALFRED v. HART, or wns'rrrnnn,

su NEW 1031;.

BRUSH,

Application filed; April 4, 1925., Serial m. 20,583.

This invention relates to improvements in brushes and hasfor its principal object to provide a construction. of brush which is simple and economical to manufacture and durable in use. I

The invention is particularly adapted to the construction of so-called roofing brushes in which there is a unitary back which holds a plurality of compacted bundles of bristles. These individual bundles of bristles in brushes of this kind have heretofore been placed in sockets and held by means of a wooden pin driven through the centre of the bundle into a concentric but smaller socket opening out of the bristle socket, Nails or the like were then driven through the back, passing through the inner end of the pin in the smaller socket. By reason of practical sizeilimitations it has usually been true that the nail would be of considerable size relative to the size of the pin and all too frequently the pin would be split, with the result that the partlcular bundle of bristles would not be firmly held.

By our invention the use of the wooden wedging pin is done away with and the bundle of bristles isheld in a socket which is of uniform dimensions throughout; and the nail which is used for holding the bristles passes directly through the bundle of bristles.

The invention is further characterized by the fact that the bound end of the bristle bundle is defined by a surrounding metal ferrule made by winding a wire spirally about that end of the bundle. And before the bundle is thus bound the bristles are dipped into a suitable cementing material.

Other objects and aims of the invention,

more or less broad than those stated above, together with the advantages inherent, will be in part obvious and in part specifically referred to in the course of the following description of the elements, combinations, ar-

-' rangements of parts, and applications of principles constituting the invention; and the scope of protection contemplated will appear from the claim.

In the accompanying drawings, which are to be taken as part of this specification, and in which we have shown merely a preferred form of embodiment of invention:

Figure 1 is a perspective view of a roofing brush illustrating an embodiment of the invention;

Figure 2 is anenlarged transversesection ofsuch a brush, with parts broken away and illustrating variations of the manner of applying the holding nail; and l Fgure 3,is a plan view looking down upon. the bound end, of one of. the bristle bundles. y

Referringto, the numerals onthe draw ings, there is shown at 4 a back, which may conveniently be made of suitable wood and having formed therein an opening 5 for the insertion of a handle 6. This back is provided on its under face with one or more sockets 7, three of such sockets being indicated in Figure 1. In each of thesesockets is to be placed a bound end of a bristle bundle 8. These bundles are made by taking a suitable number of bristles, properly sized, particularly as to length, and bringing the ends of all of the bristles at one end of the bundle (the end which is to be bound) into substantially a common plane. The size of the bundle of course will depend upon the size of the socket into which it is to enter. The ferrule is now placed around the bundle. We prefer that this ferrule should bemade by taking a length of wire or cord and winding it spirally about the bundle so that it will form in effect a ring 9. The integrality of this ring may be maintained in any usual Way, as by tying in the ends of the Wire or cord. The ring may be wound initially at one end of the bundle and then slipped down along the length of the bundle to a point intermediate the ends of the bundle, leaving both ends of the bundle free from the restraint of the ring; or the ring may be formed initially so that it will be intermediate the length of the bundle. In any case one end of the bundle (the upper or socket end in the finished article) is now dipped into a suitable binder or cement, as for instance a rubber solution which on drying will bind the bristles at that end of the. bundle together, with or without attendant vulcanization. After the dipping, and before setting has taken place, thering is slipped down to the Figure 2 position, firmly compacting the ends of the bristles and uniting them and the cement into one mass, which ultimately becomes substantially solid. The bundles are now ready to be placed in the sockets 7 as shown in Fig. 2. The bundles might be retained in the sockets in various ways, but we prefer to employ a nail 10 or other similar fastener running lengthwise of the back and traversing all of the sockets. We have found in practice that a brush constructedas describedlis very solid and durable and it very seldom happens that a bundle of bristles breaksloose from its an chorage. This fact is due to one or more of the several structural'features. The socket end of the bundle is as nearly solid as it can be under the conditions imposed. The size relation between the endoi' the bundle and thesecuring nail is such that there would be little tendeney of splitting in any case, and besides splitting is entirely prevented by reason of the fact that there is no material present, so far as the bristle bundle is concerned which is susceptible of split ting. Another feature is that since the securing nail passes between the spirals of the binding ring, the ring itself, by reason of its engagement with the nail, prevents the pulling out of the bundle.

We claim:

Inabrush construction, a back having a plurality of sockets therein, a bundle composed entirely of bristles seated in each socket, the end of each bundle being bound by a Wire ferrule, and a pin passing longitudinally through the back and through the ferrule of each bristle bundle for holding the bundles in place.

In testimony whereof We tllllX our signatures.

ALFRED v. HART. JOSEPH 'r. HART.

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