Патент USA US2411718код для вставки
Nov. 26, >1946. SFELD " ` 2,411,718 PANTOGRAPH Filed May 8, 1944 INVENTOR. l' BY _ JTA/V/fl/H/ fílß @mw/w42 ATTORNEYS ` Patented Nov. 26, `1 946 UNITED STATES PATENT I OFFICE 2,411,718 PANTGGRAPH Stanislaw Feld, New York, N. Y. Application May 8, 1944, Serial No. 534,577 1 Claim. (Cl. 33-25) 2 1 adjustable pantograph wherein the several bars in one direction, will cause the scriber tcfproduce figures larger than the figure traced by the stylus, are pivotally connected by means which may be considered permanent and unnecessary to be dis turbed for proportioned adjustment, and means the ñgures traced by the stylus. The object of my invention is to provide an while adjustment in the opposite direction will cause the scriber to produce ñgures smaller than In order to facilitate accurate adjustment of for insuring accurate adjustment of the stylus the stylus and scriber carriers Without the need and marker elements by the setting of _a single of adjustment scales on the bars 2U and 22, I set of graduations. provide turret I2 at diametrically opposite points, The accompanying drawing illustrates my in 10 with pockets 21, 21 and provide each carrier 26 vention, in which with a iinger 28 adapted to ñt the adjacent Fig. 1 is a perspective view of an embodiment pocket 21. of my invention in position upon a working In order to adjust the apparatus to a desired surface; ~ proportion, thumb screws 26', 26’ are loosened, Fig. 2 is a plan with the parts in position for 15 `'the adjustment; Fig. 3 is a perspective View of the stylus or several bars collapsed to the position shown in Fig. 2, and fingers 28, 28 seated in the pockets 21, 21. Thumb screw I8 being loosened, main bar I6 may be shifted through turret I2 to the desired position, as indicated by the graduated head; and 20 scale I1 and then fastened in position by thumb Fig. 5 is a fragmental elevation of a detail. screw I8. During this operation, the two carriers In the drawing I0 indicates a main carrier pro 26 will be automatically shifted to proper posi vided at one end with clamping means II by tions for the desired proportionate setting, and means of which the carrier I0 may be rigidly held the thumb screws 26’ may then be tightened. in position over the work surface, and provided It will be noted that the operation of adjust at the other end with a rotary turret I2 jour 25 ment may be performed by a single operation and nalled by the trunnion I3 on the base block I 4 that the pivotal connections I9, 2 I, 23 and 25, be secured to the carrier I0. Turret I2 is provided tween the several bars of the pantograph, need with a diametrical perforation I5 in which the not be disturbed. These pivotal connections, main bar I6 of the pantograph is slidably mount ed, said main bar being provided with a series of 30 therefore, may be of a permanent, non-separable character thus contributing materially to contin graduations I1 t0 indicate the proportional set ued accuracy of operation and also avoiding lany ting of the apparatus. Bar I6 may be held in possibility of loss or displacement of the parts. any desired position of adjustment relative to It will be noted that during the operation of turret I2 by the set screw I8. Pivoted at one shifting of the main bar I6 with the two carriers ’ end of bar I6, at I9, is one end of a stylus bar 26 interlocked with the turret I2, one of the car or scriber bar 20. Pivoted at 2I to the opposite riers will be moved toward the pivotal support of end of main bar I6 is the middle of a stylus bar its carrying bar while the other of said carriers or scriber bar 22. Pivoted at 23 at one end of will be proportionately moved away from the piv bar 22 is one end of 'a control bar 24, the opposite end of which is pivoted, at 25, to the middle of 40 otal supports of its carrying bar. I call attention to the fact that either carrier bar 2D, the distance between pivots I 9 and 25 being equal to the distance between pivots 2I and 26 may carry the stylus while the other carries 23. Slidably mounted on the free ends of bars the scriber but, for convenience in the claim, bar 20 will be designated the stylus bar and bar 20 and 22 are carriers 26, 26, each of which may be held in its adjusted position by its thumb 45 22 will be designated the scriber bar, but in in screw 26’. Either carrier 26 may be considered terpreting the claim it is to be understood that as the stylus, and the other as the scriber. the terms “scriber” and “stylus” may be inter changed. f The main bar I6 may be adjusted lengthwise through the turret I2. When in its middle posi I claim as my invention: tion, Where the distance between the axis of the 50 A pantograph comprising a main bar, a pivotal turret I2 and pivot 2| is equal to the distance be support for the main bar with respect to which tween pivots I9 and 25 and between pivots 2I the main bar is slidable transversely of said pivot, and 23, the iigure produced b-y the scriber will be a stylus bar pivotally associated> with one end of the same size as the iigure traced by the stylus. said main bar, a scriber bar pivotally associated y Adjustment of bar I6 from this middle position 55 with the other end of said main bar, a controller scriber carrier; ' ' Fig. 4 is an axial section of the main carrier 2,411,718 3 4 bar pivotally connected to the scrîber bar and mating means carried respectively by the main bar support and the stylus and scriber carriers for holding the stylus carrier and soriber carrier the stylus bar so as to maintain parallel rela tionship with the main bar, a stylus carrier slid ably mounted upon the free end of the stylus bar, a scriber carrier slidably mounted on the free end of the scrìber bar, means to hold said scriber car rier and stylus carrier in adjusted position, and in fixed relation relative to the main bar support during shifting of said main bar transversely o1' the pivot of said support. STANISLAW FELD.