US2971689A

US2971689A - Open window envelopes

Info

Publication number: US2971689A
Application number: US775822A
Authority: US
Inventors: Gibbon James
Original assignee: Kenrick and Jefferson Ltd
Current assignee: Kenrick and Jefferson Ltd
Priority date: 1958-03-05
Filing date: 1958-11-24
Publication date: 1961-02-14
Anticipated expiration: 1978-02-14

Description

Feb. 14, 1961 J. GIBBON 2,971,689

OPEN WINDOW ENVELOPES Original Filed March 5, 1958 INVENTOR JAMEJ GIBBON A TTORNEYS OPEN WINDOW ENVELOPES James Gibbon, West Bromwich, England, assignor to Kenrick & Jefferson Limited, West Bromwich, England, a British company Original application Mar. 5, 1958, Ser. No. 719,266. Divided and this application Nov. 24, 1958, Ser. No. 775,822

Claims priority, application Great Britain Mar. 13, 1957 Claims. (Cl. 229-71) This application is a division of my application Serial No. 719,266 filed March 5, 1958 and has reference to window envelopes of the kind having a cut out or open rectangular window as distinct from envelopes wherein the window is covered with transparent material.

It is found in practice that when open window envelopes are fed one at a time from a staggered heap of envelope blanks there is a tendency for the trailing transverse edge of the window of the topmost envelope blank to foul the leading transverse edge of the envelope blank beneath and thus interfere with the accurate feeding of succeeding envelopes through the machine.

The invention has for its primary object to provide an envelope which overcomes the aforesaid difiiculty. The invention has for a subsidiary object to provide an envelope which facilitates the insertion of the contents of the envelope by reducing the tendency for the contents to foul the lower transverse edge of the window of the envelope.

in this specification the terms leading, trailing and transverse edges are defined in relation to the position which the envelope blanks assume during the stage of manufacture of the envelopes in which the tendency for fouling is to be avoided.

The invention consists of an open window envelope characterised in that the leading and/or trailing transverse edge or edges of the open window of the envelope blank has or have been downturned and/or upturned respectively relative to the plane of the blank for the purpose specified.

Preferred means carrying the present invention into practice will now be described with reference to the accompanying drawings wherein:

Figure l is a perspective view of a staggered pile of envelope blanks in accordance with this invention.

Figure 2'is a section on the line ll-ll seen in Figure l, and

Figure 3 is a front perspective view of an assembled envelope in accordance with the invention.

As seen in Figures 1 and 2 of the drawings the opposed parallel leading and trailing transverse edges 5 and 6 of the window aperture of the envelope blanks are down- United States Patent 0 turned and upturned respectively out of the plane of the envelope blank so that when the topmost envelope blank 7 is fed from a staggered pile of single sheet envelope blanks 7, 7a, 7b etc., the tendency for the trailing edge 6 of the topmost blank to foul the leading edges 5a, 5b of the blanks 7a, 7b thereunder is avoided.

Each blank comprises a sheet having an open window 12, side flaps 13 and end flaps 14'and 15. The edges 5 and 6 are opposed edges of window 12, and narrow lips 5 and 6' respectively are bent oppositely out of the plane of the sheet as illustrated.

Means for etlecting the deliection or inclination of the transverse edges of the window in the'above manner are disclosed in my patent application Serial No. 7l9,266.

It will be realised that if the subsidiary object of the invention is to be fulfilled, viz. that the insertion of the contents of the envelope is to be facilitated, then the transverse leading and trailing edges 5 and 6 respectively should be downturned and upturned with the inside face of each blank uppermost and with the subsequently closed end of the blank leading in the direction or teed of the blanks in order to produce an envelope having the window formation seen in Figure 3 after the blank has been assembled.

I claim:

1. An envelope blank comprising a sheet of material having foldable side and end flaps and formed with an open window having parallel transverse edges, said end flaps terminating respectively in leading and trailing edges as determined by the normal direction of feed of said blanks from a stack, and a narrow lip extending along one of said transverse edges and projecting angularly with respect to the plane of the sheet, said lip being formed of material bent out of said sheet at said one edge.

2. An envelope blank comprising a sheet of material having foldable side and end'naps and formed with an open window having parallel transverse edges, said end flaps terminating respectively in leading and trailing edgesvas determined by the normal direction of feed of said blanks from the top of a stack of blanks, and a narrow lip extending along each of said edges, said lips projecting oppositely angularly with respect to the plane of said sheet and each being formed by material bent out of said sheet at the associated edge, and the lip nearest the leading edge projecting downwardly out of the plane of the blank.

3. An open window envelope having a front wall, a mouth along one edge for insertion of contents and a closure flap for said month, said front wall having an open window through which part of the contents may be viewed and said window having opposite parallel transverse edges which extend generally parallel to said mouth, and an integral inturned narrow hp extending along that transverse edge which is nearest said mouth and projecting from the plane of said front wall toward the interior of said envelope.

4. An open window envelope having a front wall, a mouth along one edge for insertion or contents and a closure flap for said mouth, said front wall having an open window through which part of the contents may be viewed and said window having opposite parallel transverse edges which extend generally parallel to said mouth, and an integral inturned narrow lip extending along that transverse edge which is furthermost from said mouth and projecting from the plane of said front wall away from the interior of said envelope.

. 5. An open Window envelope having a tront wall, a mouth along one edge for insertion of contents'and a closure flap for said mouth, said front wall having an open window through which part'of the contents may be viewed and said window having opposite parallel transverse edges which extend generally parallel to said mouth, and narrow integral lips extending along each of said transverse edges formed of material oppositely bent out of the wall to project angularly with respect to the plane of the wall, the lip nearest the mouth projecting toward the interior of the envelope.

References Cited in the file of this patent Patented Feb. 14, 1961 v Klinger May 8, 1934