(No Model.) 2. Sheets-Sheet 1 T. C. EBER HARD, ENGRAVING MACHINE, No. 415,450, Patented Nov. 19, 1889. () a 841 uo 11 for -2666 38: Azu-/e (e.g4s CZ776erzazz/ r. Washington, D.C. (No Model.) 2. Sheets-Sheet 2. T. C. EBER HARDT, ENGRAWING MACHINE, No. 415,450, Patented Nov. 19, 1889. V 928) it vesses s 3v-uovot sy - ZAeop/lavas CZ76erzorae, PETERS. Photo-lthographer. Washington, D.C. UNITED STATES PATENT OFFICE. THEOPHILU'S CHARIES EBER HARDT, OF (UERO, TEXAS. ENGRAVING-MACH NE. SPECIFICATION forming part of Letters Patent No. 415,450, dated November 19, 1889. Application filed December 21, 1888, Serial No. 294,296, (No model.) To all u?ion it inctly concern: transversely on the under side of the platen Be it known that I, THEOPHILUS CHARLES at a suitable distance from the outer end EBERHARDT, a citizen of the United States, thereof, and has notches or rabbets N in its 5. residing at Cuero, in the county of De Witt ends. and State of Texas, have invented a new and O represents a clamp, which is also arranged liseful Improvement in Engraving-Machines, on the under side of the platen, and is pro of which the following is a specification. vided at its ends with right-angled arms P, My invention, relates to an improvement that fit in the rabbets N. From the upper in engraving-machines; and it consists in the side of the clamp O, at the center of the same, O peculiar construction and combination of de projects a stem R, which extends through a vices that will be more fully set forth here central opening in the platen F, and on the inafter, and particularly pointed out in the outer end of the said stem is pivoted a lever claims. S, the said lever having a cam Tat its inner 65 In the accompanying drawings, Figure 1 pivotal end adapted to engage a transverse is a perspective view of an engraving-ma pin U in the outer end of stem R. Chine embodying my improvement, the platen V represents a pair of adjusting-screws, being lowered and the machine arranged in which engage threaded openings near the position for use. Fig. 2 is a similar view outer corners of the clamp O, and have their 7 O showing the platen raised. Figs. 3, 4, 5, 6, inner ends bearing against the under side of and 7 are detail perspective views. the platen. A pair of spring-arms Whave A represents a rectangular base-board of their inner ends secured to the under side of Suitable size, on which is arranged a rectan the platen and have their free ends bearing gular plate or table B, the latter being se against the upper side of the clamp O, the 75 cured to the base A by screws and detach function of the said spring-arms being to able from the said base. normally move the said clamp O from the C represents a plate, which is arranged platen. transversely under the table or plate B, near The operation of this portion of my inven one end of the latter, is fitted between said tion is as follows: A plate or other substance plate B and the base A, and is provided at to be engraved is placed behind the plate M, its ends with vertical arms D E, which rise with its ends projecting beneath the rabbets from the plate B, and extend through notches N, and by turning the lever S the operator or Openings in the latter, as shown. causes the cams T to engage the cross-pin U, F represents the platen, which has one end and thereby draw outward on the stem R and pivoted between the upper ends of the arms clamp O, and consequently cause the right D by Screws G, having conical engaging ends angled arms P of said clamp to bear on those fitting in similarly-shaped sockets in the ends of the plate which are over the rabbets platen, said Screws Working in threaded open N, and thereby clamp the said plate on the ings in the upper ends of the arms D, and hav plate M. ing jam-nuts H, by which they may be secured X represents a rectangular plate of suitable at any desired adjustment. Screw-studs are size, which is fitted in a countersunk opening arranged in the outer corners of the platen in the upper side of plate B and arranged F, project from the under face thereof, and upon the plate C, the said countersunk open are adapted to enter sockets K in the upper ing being of sufficient depth to cause the up 95 ends of the arms E when the platen F is turned per side of plate X to be flush with the sur 45 downward on said arms E to a position paral face of plate B. lel with the table or plate B. From the piv Y represents a plate which is arranged on otalend of the platen projects an arm L, which the plate B, and has a frame A" around its is adapted to engage one side of the plate or edges, which is adapted to retain a paper, OO table B when the platen is turned to its ele slate, or other surface on which a character, vated position (shown in Fig. 2) and support drawing, engraving, or other matter to be the said platen in the said position. copied is printed, drawn, or otherwise in M represents a plate, which is arranged scribed. 415,450 B' represents a pantograph, which comprises odicals, and which form the subject-matter a pair of parallel bars C. D', of unequal of another application for Letters. Patent of lengths, a bar E', which has its ends con the United States, filed by me this day; but nected to the said bars, and a bar F" which is the said apparatus may be also employed for 5 connected at and near one end to the outer other useful purposes, such as engraving On ends of said bars. The inner end of the bar wood, engraving matrices for stereotype-cast C is pivoted on a stud G', that rises from ings from chalk-covered steel-plates, &c. the plate B, near one corner thereof. Having thus described my invention, I H' represents screw-studs which pivot the claim O bars F to the bars C'D', and pivot the bar E' to 1. The combination of the bed-plate, the the bar C, said studs extending downward and downwardly-facing platen mounted thereon, bearing on the plates X and B, and serving to and the pantograph pivoted on the bed-plate support the pantograph horizontally over and having the tracing-point and the engrav said plate and in a plane parallel therewith. ing-point or stylus, substantially as de 75 The screw-stud I, which connects the bars D' Scribed. and E, has a threaded socket in its upper 2. In an engraving-machine, the platen, in end, in which is screwed a stylus or graving or combination with the plate M on the under etching point K'. side thereof, the clamp-plate O, having the So L' represents a sleeve or knob, which is se stem R extending through the platen, and cured on the bar F at the outer end thereof, the lever pivoted on the said stem and hav and through which extends a tracing-pencil ing the cam to operate the clamp, Substan M', the latter being secured in the knob or tially as described. sleeve L' at any desired adjustment by a set 3. In an engraving-machine, the combina Screw N. - tion, with the platen, of the clamp-plate O on O' represents an adjusting-screw, which is the under side thereof, the springs W to arranged midway between the arms E, and normally move the clamp-plate from the is adapted to bear under the free ends of the platen, the stem R, projecting from the clamp platen F. plate through an opening in the platen, and 90 The operation of my invention is as follows: the lever pivoted on the said stem and hav When the plate on which the engraving is to ing the cam to operate the clamp, substan be made has been secured to the under side tially as described. of the platen in the manner before described, 4. The combination, in an engraving-ma the platen is turned down upon the arms E, chine, of the platen having the plate M on its 95 the studs I entering sockets K in the upper under side with rabbets N, the clamp-plate 35 ends of said arms and serving to secure the O, having the right-angled arms P to engage platen rigidly thereon. The plate X is ad said rabbets, the stem R, projecting from the justed vertically in a plane parallel to the plate clamp-plate through the platen, and the le M by turning the screws Y' to cause the ver having the cam engaging the said stem, ICO stylus K to engage equally at every point the for the purpose set forth, substantially as de surface of the said plate to be engraved, the scribed. depth of the cut made by the said stylus being 5. The combination of the bed-plate C, hav regulated by the screw O'. The original from ing the arms or standards DE, the platen F, which the engraving is to be made or the having one end pivoted between the arms D, IO5 slate or paper upon which any desired word and having the studs I to engage sockets K 45 is to be written being secured on the plate Y, in arms E, and the pantograph pivoted on the operator, by grasping the knob or sleeve plate or table B and having the stylus, sub L' and tracing the said original or writing stantially as described.