US441909A

US441909A - Pantograph

Info

Publication number: US441909A
Authority: US
Publication date: 1890-12-02
Anticipated expiration: 1907-12-02

Description

2 Sheets-Sheet 1. L. WALKUP.

(No Model.)

PANTOGRAPH.

Patented Dec 2, 1890.

2 Sheets-Sheet 2. L. WALKUP.

PANTOGRAPH (No Model.)

H EH Q Patented Dec. 2, 1890.

Mei

UNITED STATES PATENT OFFI E.

LIBERTY YVALKUP, OF ROCKFORD, ILLINOIS.

PANTOG'RAPH.

SPECIFICATION forming part of Letters Patent No. 441,909, dated December 2, 1890.

' Application filed March 3, 1890- Serial No. 342,490. (No model.)

To aZZ w/wm it may concern.-

Be it known that I, LIBERTY WALKUP, a citizen of the United States, residing at Rockford, in the county of Winnebago and State of Illinois, have invented certain new and useful Improvements in Pantographs, of which the following is a specification.

The object of my invention is the production of apantograph having a detachable and adjustable tracing-finger; and it consists of certain new and useful features of construction and combinations of parts hereinafter described. and point-ed out in the claims.

Referring to the accompanying drawings, which form a part of this specification, Figure 1 is a plan View of a pantograph provided with my improvements. Fig. 2 is a side elevation of the tracing-finger and its. support. Fig. 3 is an enlarged detail fragment-a1 View of the same, the connection of the fingersupport with the bars of the pantograph being clearly shown. Fig. 4 is also a view of the same as the last, showing the inception of the mode of detaching the tracingfingerand its support from the pant-ograph. Fig. 5 isa plan View of the parts that support the tracin g-finger, the latter being removed. Figs. 6 and 7 are enlarged end views of the slides that support the tracing-finger.

Like letters of reference indicate corresponding parts throughout the several views.

A A A and B B B are crossed parallel bars hinge-jointed together by means of pintles O, which are inserted through holes there in and headed down on both ends to retain them in their places. The parts just described constitute the frame of the pantograph.

O are holes, arranged in regular series, extending through the bars A A A B B B and having countersinks O in thelower ends thereof. The functions of the holes and countersinks will be fully explained hereinafter.

D is a tracing-finger having holes D extending therethrough to afford means of ad justing the same, and being provided with a downwardly-curved point D for tracing the lines to be reproduced by the pantograph.

E is a base. E is a slide-holder rigidly connected therewith.

E E are slides which support the tracing finger D and afford means of adjusting the same. g

E is a stud produced at its upper end E" to adapt it to pass through a hole D in and engage with and be disengaged from the traeing-finger D, and having a head E at its lower end adapted to engage wit-h and be disengaged from the countersink C in the bar B.

E is a bolt mounted in the ways E E", which are fast to the base E.

E is a spring for actuating all the parts shown in Fig. 3, except the bolt E bars I; B, and partE.

E is a stud projecting transversely downward from the bolt E and having a head E at its lower end adapted to engage with and be disengaged from the countersink C in the bar B.

The parts from E to E, inclusive, taken together, will, for convenience, be hereinafter denominated the finger-support, and will be designated by the letter E G is a hinge-plate pivotally connected with the bar A, and may be secured to a drawingboard or table by means of a thumb-tack and screw-eye G G H is a pencil-holder.

H is a pencil.

The tracing-finger D and fingersupport E may be detached from the pantograph-frame in the following manner, (see Fig. 3:) The operator grasps the tracing-finger and fingersupport with the thumb and forefinger of one hand at any desired point between the bars B B, pressing the pantograph-frame with the other hand against a drawing-board or the like and pushing all the parts there shown, except B B F. and E, over to the position indicated by dotted lines, and lifts the studhead E out of connect-ion with the bar B, and the endwise pressure being withdrawn therefrom the parts will assume thepositions shown in Fig. 4. The stud-head E may then be readily disengaged from the bar B. To at-- tach the fingersupport and finger to the pantograph-frame, reverse the mode of operating just detailed. Obviously the finger-support with its finger may be attached to the bars B B O at any desired point within the limits imposed by the holes C therein between the IOC bars A B The tracing-finger D may be raised and adj ust-ed lengthwise in the slides E E, as indicated by the dotted lines in Fig. 2, to any extent desired within the limits of the instrument. Thus it will be seen that a pantograph of the construction herein shown and described has a much Wider operative scope than the instruments of that genus now in use.

I elain1 1. In combination, the finger-support; consisting of a base, the slide-holder attached thereto and provided with slides,tl1e stud E, connected with the base, the bolt mounted in Ways supported by the base, the actuatingspring, the stud E projecting from the bolt, and the tracing-finger adapted to operate in LIBERTY WALK UP.

Witnesses:

L. L. MoRRIseN, 'E. F. DoWLINe.