Copyright © Françoise Herrmann
The popular Abercrombie pack carrier, comprising a rigid frame, optional tumpline(1) and chest strap, is another patented invention that was awarded to David T. Abercrombie, the founder of Abercrombie Co., in 1892. Indeed, the US patent, US1217262, titled Pack carrier, was awarded on February 27, 1917 to David T. Abercrombie, hailing from New Jersey, and assigned to the New York corporation, David T. Abercrombie Company.
The invention had a twofold purpose. First, the rigid frame was designed to prevent contact between the rucksack(2) and the user’s back so that air could circulate freely in between. Secondly, the frame was designed to prevent the rucksack from rolling during movement and in case of an uneven load, ensuring that the load's weight was consistently centrally distributed between hips and shoulders, and optionally transferred in part to the forehead and/or chest.
The included patent Figure 1 depicts a side elevation view of the invention, and a user’s body(3). The patent Figure 1 further depicts a side view of the frame a, preferably rectangular in shape, and comprising light steel rods, with rounded ends a1 to conveniently attach a tumpline g, comprising a head strap g1 and an adjustment buckle g2. Likewise, the top bar of the frame might be bent upwards at the center a2 to enable attachment of shoulder straps c, adjusted with various buckles c1. Preferably, the frame a has a flexible light canvas filler b, secured to the frame a with lacing b1. The filler material b was designed to provide additional support in case the load was shorter or smaller than the frame. Finally, two hinged thrust rods d at the lower end of the frame were joined via a transversal rod d1. Together, the three rods functioned as a bail to transfer a portion of the load's weight to the hips, where it is less inconvenient to carry.
Below, pages 34 and 35 are extracted from the 1921 Blazed Trail Abercrombie & Fitch product catalog. The pages show various rucksacks, some of which would have accommodated the present invention frame, which also had the advantage of being removable and adaptable to various rucksack models.
Notes
* US patents were initially called Letters Patent in the European tradition, dating as far back as the 15th century, and at the inception of the United States, at the end of the 18th century, according to the first US Patent Act (1790). The term Letters Patent was then used well into the 19th century, although usage began to shift, following the provisions of the third US Patent Act (1836), which established the United States Patent Office.
The term “Letters Patent” is derived from Latin, “litterae patens”, a form of the verb “patere”, which means “to stand open”. In other words, a term that refers to “open letters” in the sense of public or “by decree” and in contrast to private “sealed letters” (in Latin litterae clausae)
(1) A tumpline, also called a tump strap, is a canvas forehead band designed to transfer some of the rucksack weight to the head.
(2) A rucksack is a top-loading pack designed for heavy outdoor loading.
(3) The user’s body is drawn with broken lines to indicate context vs. object of the invention.
(3) The user’s body is drawn with broken lines to indicate context vs. object of the invention.
Reference
Abercrombie & Fitch (website)
