US1518756A - Inking pad - Google Patents

Description

Dec. 9,

H. J. RAP LEY ET AL INKING PAD Filed 001,. 1925 Patented Dec. 9, 1924.

UNITED STATES 1,518,756 PATENT OFFICE.

HARRY J. RAPLEY, OF CAMBRIDGE, AND LAWRENCE W. KENDBIGK, OF BOSTON,

MASSACHUSETTS, ASSIGNORS TO THE GARTERS INK'COMPANY, OF CAMBRIDGE, MASSACHU$ETTS, .A. CORIPOBATION OF MASSACHUSETTS.

rnxme PAD.

Application filed October 9, 1923. Serial No. 667,488.

To all whom it may concern:

Be it known that we, HARRY J. RAPLEY, of Cambridge, in the county of Middlesex and State of Massachusetts, and LAWREN E W. KENDRIGK, of Boston, in the county of Suffolk, in said State,both citizens of the United States, have invented a new and useful Improvement in Inking Pads, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in explaining its nature.

The invention relates to an inking pad of the general type used for inking stamps or dies. More specifically the invention relates to an improvement in that type of inking pad employing a covered ink-carrying top lay of felt or other ink-absorbing material to which the stamp or die is applied, which top lay is supplemented by aninner inkcarrying. lay of some material which acts as a reservoir for the top lay, giving up its ink to the top lay for keeping it properly saturated at all times as long as any ink K remains in the pad.

While the making of an inking pad of this type would appear to present a very simple problem, yet very serious difficulties have been encountered in practice, which in so far as we are aware have never been suc cessfully overcome. In the first place the top and inner lays of felt or other inkabsorbing material must be separated from each other in order that the inner lay may not too freely give up its ink to the top lay, but only as occasion requires for keeping the top lay properly saturated as the ink becomes exhausted therefrom. The means of separation between the two lays should also act as a uniform support for the top lay throughout its entire area, for otherwise repeated use of the stamp or die at some par ticular part of the pad willcause a depression therein and the pad will become practically useless, for in order that the pad may function properly at all times the top lay of felt or other ink-saturated material should maintain a uniform level surface without depression at any point.

In practice all means or elements separating the two lays of felt have had one or the other of the following objections: If the element properly supported the top lay of felt to maintain a level surface it would not permit of the proper passage of ink from the wise supported in such a manner as to af 7 ford at all times a proper uniform support for the top lay and which will permit of a proper feed of ink from the inner lay to the top lay as occasion requires.

The invention can best be seen and understood by reference to the drawings, in which I Figure 1 in a perspective of the inking pad.

Fig. 2 is a plan showing the various parts ofdthe pad with portions thereof removed, an

3 is a cross section.

Referring to the drawings 1 represents the body of the receptacle or box in which the inking pad proper is contained. The body is provided with a hinged cover 2.

The inking pad comprises a base 3 of some elastic non-ink-absorbing material, and in this connection a base of rubber or rubber compound is preferably employed.

Mounted on the base is alay lof absorbent felt, hereinafter referred to as the inner lay.

Over the lay 4: is placed a thin perforated plate 5 of some stiff though flexible non-inkabsorbing material, and in this connection a plate of material of fibrous nature such as stiff oiled paper is preferably employed.

Over the perforated plate is a lay 6 of ab-- sorbent felt substantially like the lay The lay 6 will hereinafter be referred to as the top lay.

Over the top lay 6 is placed a thin cover 7 of fabric material or cloth which extends downwardly around the sides of the entire pad binding the parts together, and is preferably fastened or cemented to the under side of the base 3.

In the operation of the pad the plate 5 backing the top lay of felt possesses sufficient stiffness to enable it to so support the lay that it will present and maintain an man even top surface or face. When thestainp or die is applied to the top lay it is subjected to pressure over a relatively restricted die be repeatedly applied at substantially the same point. The elasticity of the base also prevents any depression being formed in the lay of felt 4, the two lays of felt continuing to maintain their original even thickness during the life of the pad.

Upon the application of pressure to the top lay, as when the stamp or die is used, the action tends to compress the inner lay of felt 4 between-the plate 5 and the base, thereby tending to press out the ink and the perforations in the plate enable the ink to pass through this plate and feed into the top lay. If, however, the plate 5 be a stiff non-flexible plate, then any pressure applied to this plate will be distributed evenly over the entire surface of the inner lay 4:. Consequently a very high degree of pressure would have to be applied to this plate to press the ink therefrom and the pressure from the ordinary use of a stamp or die would be practically negligible, with the effect that the ink might be entirely remains in it,

exhausted from the top lay and ink still remain in the inner lay, suci lay then failing entirely to function as a reservoir for feeding the top lay. On the other hand, if the plate 5 be flexible so as to yield to pressure applied over a relatively small area and if, also, the inner lay be backed by an unyielding surface, then in such case the inner lay will be so compressed that the ink will be too quickly forced out of it and the top lay will become over-saturated. The elastic or yielding base 3 of present construction, however, overcomes this difficulty. In other words, though the plate 5: is fleXible, yet owing to the yielding elasticity of the base the inner lay will not become so compressed as to give up its ink too freely, but the operation will be a very gradual one, the inner lay acting as a true protracted feed for the toplay as ink becomes exhausted therefrom, the feed 'of ink from the "inner lay continuing as long as any ink Having thus fully described our invention, we claim and desire to secure by Letters Patent of the United States All inking pad comprising a receptacle having within'it a base of some elastic nonv- HARRY J. RAPLEY. LAWRENCE W. KENDRICK;

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