This Southworth Autogrip Form Truck was patented in 1914 and was made for the purpose of moving heavy forms in chases through the print shop while stood on edge. See attached patent drawing.

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From the patent document:

The present invention relates to trucks more especially for printers uses and while having other and more general fields of usefulness it is well adapted .for handling printers forms or chases to move them conveniently from one part of a printing office to another. The trucks for this purpose that have been heretofore used, have generally been of a type wherein the form or chase would rest loosely upon the truck with a consequent lliability of disarrangement or displacement o-f the truck under the chase as it is moved along and a consequent likelihood of accident and trouble.

The prime object of the present invention is to provide an improved truck wherein a seat is provided on which the chase may rest,

and when so resting is automatically gripped and held securely in the position where it is placed so long as it rests on the truck, the construction being such that the heavier the form, the greater will be the gripping or clamping pressure exerted thereon.

According to my invention means is provided whereby the form as it rests on the truck is gripped automatically at definite substantially separated points between a fixed wall or jaw and a movable swingingy jaw wherein forms presenting uneven or, tapering surfaces may be securely grippedE and wherein the grip or hold of the jaws upon the form is not liable to be broken or` released by the swaying or swinging movement from sideto side of the chase or form" while being conveyed along over rough orl uneven floors or surfaces. To attain this end 1 preferably provide vxed abutments orf lugs at opposite sides of the respective ends of the form seat on the truck body, and arranged for coperation therewith, movable jaws having `form gripping portions adapted to localize the gripping action of each jaw adjacent and opposite a xed abutment or jaw at the respective ends of the formf seat. It is to be understood that where reference is made to a printers forni or like expression as the article to be handled by the present truck, this is merely illustrative and -intended to typify any article adapted to be handled and conveyed bythe truck construction shown.