pantograph

(redirected from Pantagraph)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to Pantagraph: planimeter

pantograph

1. an instrument consisting of pivoted levers for copying drawings, maps, etc., to any desired scale
2. a sliding type of current collector, esp a diamond-shaped frame mounted on a train roof in contact with an overhead wire

Pantograph

A drafting instrument for copying drawings, or plans, either at the same scale or an enlarged or reduced scale.

Pantograph

 

an instrument used to redraw plans, maps, and the like to a different, usually reduced, scale. Pantographs are made in various sizes and to different designs; for example, in some, the bar assembly is suspended, and in others it rides on casters. Figure 1 shows a suspension-type pantograph, in

Figure 1. Suspension-type pantograph

which the weight of the guide bars is partially balanced by the tension of the guys. In comparison to other designs, this pantograph has a softer, smoother motion and makes a more accurate copy. It consists of two parallel pairs of guide bars, which are interconnected by joints at points A, B, C, and D to form the parallelogram ABCD. Point A is fixed, a pin at F is used to trace the original, and a pencil at P traces a reduced copy. The scale ratio of the original and the copy can be altered by sliding the guide bar CD along the guide bars AE and BF; at the same time, in order to more closely reproduce the original, the pencil at P must be shifted so that A, P, and F lie on a straight line.

pantograph

[′pan·tə‚graf]
(engineering)
A device that sits on the top of an electric locomotive or cars in an electric train and picks up electricity from overhead wires to run the train.
(graphic arts)
A drawing instrument used for copying and consisting of four rigid bars linked together in a parallelogram form; one arm, equipped with a pencil, is connected through the bars to a pointer that is used to trace the original drawing.

Pantograph

A four-bar parallel linkage, with no links fixed, used as a copying device for generating geometrically similar figures, larger or smaller in size, within the limits of the mechanism. In the illustration the curve traced by point T will be similar to that generated by point S. This similarity results because points T and S will always lie on the straight line; triangles and are always similar because lengths, and are constant and is always parallel to. Distance always maintains a constant proportion to distance because of the similarity of the above triangles. Numerous modifications of the pantograph as a copying device have been made.

A second use of the pantograph geometry is seen in the collapsible parallel linkage used on electric locomotives and rail cars to keep a current-collector bar or wheel in contact with an overhead wire. Two such congruent linkages in planes parallel to the train's motion are affixed securely on the top of the locomotive with joining horizontal members perpendicular to each other. The uppermost member collects the current, and powerful springs thrust the configuration upward with sufficient pressure normally to make low-resistance contact from wire to collector.

pantograph

A drafting instrument for copying drawings, plans, etc., either on the same scale or on an enlarged or a reduced scale.
References in periodicals archive ?
Oddly, the walk Burns issued wasn't recognized until the June 2, 1909 Pantagraph.
Currently, The Pantagraph said A-1 has applied to Ford County, IL, seeking a conditional-use permit for industrial zoning and is conducting feasibility testing with Western Illinois University.
4, 1991, available in 1991 WL 6055746 (commenting upon the lightening of Michael Jackson's skin over the years and his sister's argument that the cause was lupus); Gary Mays, No Cure for Jackson's Disease, THE PANTAGRAPH, Mar.
Bloomington-Normal newspaper, The Pantagraph, has followed the story closely.
We also used this tool as a pattern for the pantagraph miller that machined the aluminum vacuum-forming molds for the production runs of the Noggin's plastic housings.
Pulitzer Prize-winning Washington Post columnist David Broder recalled that when he broke in on the old Bloomington (Illinois) Pantagraph 45 years ago, the search for facts was taken very seriously.
Hayakawa, was printed by Pantagraph Printing and Stationery, whose salesman, one Ed Bryan, would drop in from time to time.
Davis, the Republican editor of the Bloomington Daily Pantagraph, also congratulated Stevenson.
Jobs have been plentiful here - State Farm, Mitsubishi and Illinois State University are major employers - and the local paper, The Pantagraph, a fortress of prickly conservatism founded by the family of Adlai Stevenson, is doing well in both advertising revenue and circulation.
Dunmore transferred to Illinois State but in 2015 was dismissed for conduct detrimental to the football team, according to The Pantagraph newspaper of Bloomington, Ill.
Tenders are invited for Bow Suspension Assembly Balancer Assembly For Faively Pantagraph Type Am 18 B1 And B2 Sil No S001115 To Sil New Ref No.