US410923A - David reid - Google Patents

Description

(No Model.)

D. REID.

MEANS FOR SEGURING STBRBOTYPB PLATES.

No. 410,923. Patented Sept.. 10, 1889.

l Ivzvfizf/f: Jamie? UNITED STATES PATENT OFFICE;

DAVID REID, OF MELBOURNE, VICTORIA.

MEANS FOR SECURING STEREOTIYPE-PLATES.

SPECIFICATION forming part of Letters Patent No. 410,923, dated September 10, 1889.

Application {iled August 13,1888. Serial No. 282,601. (No model.) Patented in Victoria July 6, 1888, No. 5,953; in New South Wales July 9, 1888. No. 768; in New Zealand July 26,1888,No. 3,134, and in England August 11, 1888, No. 11,621.

To all whom t may concern,.-

Be it known thatI, DAVID REID, publisher, a subject of the Queen of Great Britain, residing at No. 112 Flinders Lane, East, in the city of Melbourne and British Colony of Victoria, have invented a new and useful Improved Means for Securing Stereotype-Plates to their Base-Blocks, (for which I have obtained Letters Patent in Great Britain, dated August 11,1888,No.11,621; in Victoria, dated July 6, 1888, No. 5,953; in New South Wales, dated July 9, 1888, No. 768, and in New Zealand, dated July 26, 1888, No. 3,1340 of which the following is a specication.

This invention relates to an improved means for securing stereotype-plates to their baseblocks; and it refers more particularlytothat method of or means for securing stereotypeplates to their base-blocks wherein a key is employed which in section forms a double dovetail, the upper dovetail of which is flttedintoa corresponding `groove on the under or back side of the stereotype-plate,while thelower dovetail is fitted into a correspondingly-shaped groove on the upper face of the base-block; but I have found in practice that this arrangement for securing stereotype-plates to their basebloeks is defective in some respects, inasmuch as it is incapable of adjustment. Now, according to my present invention I still retain the double-dovetail key, but Imake it in two or more thicknesses, and the upper part of it in two or more strips lengthwise, and Iso conn'ect the upper part of the key with its lower part as to make it susceptible of adjustment, so as to provide for any possible inequality in the face of the stereotype-block. By making it in strips lengthwise I am enabled to more accurately adj ust any part of the face of the plate which requires adjustment, and the best means I have found for effecting the vertical adjustment of the upper plates of the key, and consequently of the face of the stereotype-plate,fis by means of two sets of screws, the one of which connects the upper plates to the lower plates of the key, and the others of which form the supports for the upper plates and constitute the means for adjusting it. This will be better understood on reference to my drawings, in which Figure 1 is a transverse vertical section of a stereotype-plate, adjustable double-dovetail key, and base-block. constructed according to myinvention. Fig. 2 is a plan of the adjustable double dovetail key hereinbefore mentioned. Figs. 3 and 4 are respectively an elevation and a plan of one of the screws for vertically adjusting the upper part of the key.

That part of the drawings which is indicated by the letter A represents the baseblock formed with an undercut dovetail groove a, to receive the lower dovetail b of the key B, while the upper dovetailbof same fits into the undercut dovetail groove c in the under side of the stereotype-plate C.

D D represent ordinary screws holding the upper and the lower plates ot the key together, while E E represent the adjustingscrews, formed, as shown, with a shoulder eto bear against the-under side of the upper portion of the key B, whereby its thickness may be readily adjusted by reason of the said screws raising the strips of which the upper portion of the key B is constructed, as shown.

The operation ot' my invention is as followsthat is to say, assuming that the printing comes up faint at any part, thereby indicating that the stereotype-plate is not perfectly fiat, then it is only necessary, first, to slacken the screws D at or about the faint part, then to unscrcw the adj usting-screwsE at or about the same part, so as to raise their shoulders, and thus raise that part of the upper portion of the key so as to correct the inequality in the printing-plate. An alternative method of adjusting the face of the stereotype-plate is to dispense with the adj usting-screws E and to use thin metal liners or wedges between the upper and lower plates of the key; but Iprefer to use the screws E. Further, this adjustment may be also effected even if the upper part of the key be made of one plate, instead of two or more; but I prefer to make such upper part of the key in three strips or widths, as'shown.

Having now particularly described and ascertained the nature of my invention and in what manner the same is to be performed, I declare that what I claim as my improved means for securing stereotype-plates to their base-blocks is- 1. An adjustable double-dovetail key B,

IOO

Consisting,l of an upper and a lower part suitably connected together, substantially as herein described and explained.

2. An adjustable double-dovetail key con! plate, of an adjustable double-dovetail key for securing the plate to the block, said key beingr composed of a lower section provided with screw-threaded openings, and an upper section formed of a plurality of longitudinal strips provided with unthreaded openings of less diameter than those iu thelower section, in combination with adjusting-screwshaving a threaded portion of the same diameter as the threaded bearings in the lower key-section, and a head of less diameter than the openings in the upper section to Vform ashoulder upon which the strips of said upper section rest, substantially and for the purposes specified.

DAVID REID.

Witnesses:

EDWARD WATERS, W ALTER SMYTI-IE HAYs'roN.

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