← Back to Patent Explorer
US3881644A Expired / Lapsed US ⏱️ 0.0 years remaining

Convertible and collapsible backpack

Assignee: Individual
•
Filing: 1974-02-14
•
Granted: 1975-05-06
•
Expires: 1994-02-14
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A convertible and collapsible backpack adapted for shoulder support for persons to carry various types of loads on their backs while walking, said backpack being comprised of a pair of elongated J-shaped members of hollow tubular construction, said J-shaped members being conjoined by two mutually parallel collapsible bars extending in a perpendicular fashion from the middle portion of said J-shaped bars; said J-shaped members having on their respective axial lengths a plurality of holes extending therethrough which are capable of receiving therethrough a series of pins which lock onto corresponding positions on the respective J-bars the fastening ends of various carrying members such as a baby pouch, or a knapsack support, or alternately, a tray member for eating meals when at rest.

Inventors

  • 👤 Donald R Demaline

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 02:14
CPC Classifications
A; A47; A47D; A47D13/00; A47D13/02; A47D13/025; A45; A45F; A45F3/00; A45F3/10; A47D13/027

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 148 words
A portable knapsack frame supporting interchangeably various carriers comprising: a. a pair of J-shaped bar members disposed in mutually parallel fashion, a collapsible and hinged bar member having sleeves at the ends thereof, each of said J-shaped bar members being received in a corresponding sleeve, means for attaching said Jshaped bar members in said sleeves, said hinged bar member joining said J-shaped bars so that the J-shaped bar members can be moved towards one another by folding of the hinged bar members, said J-shaped bar members having therein a plurality of apertures for receiving bolt members; b. a carrier having projecting sleeve members for attachment to the J-shaped members; c. said sleeve members being slidably received on said J-shaped bars and adapted to be fixed relative to said carrier by a bolt being locked through each sleeve member and a corresponding aligned aperture in said J-shaped bar members.
Claim 2
Dependent Claim 148 words
A portable knapsack frame supporting interchangeably various carriers comprising: a. a pair of J-shaped bar members disposed in mutually parallel fashion, a collapsible and hinged bar member having sleeves at the ends thereof, each of said J-shaped bar members being received in a corresponding sleeve, means for attaching said Jshaped bar members in said sleeves, said hinged bar member joining said J-shaped bars so that the J-shaped bar members can be moved towards one another by folding of the hinged bar members, said J-shaped bar members having therein a plurality of apertures for receiving bolt members; b. a carrier having projecting sleeve members for attachment to the J-shaped members; c. said sleeve members being slidably received on said J-shaped bars and adapted to be fixed relative to said carrier by a bolt being locked through each sleeve member and a corresponding aligned aperture in said J-shaped bar members.
Claim 3
Dependent Claim 22 words
A portable knapsack frame as described in claim 1 in which carRier including a depending pouch having leg apertures for carrying children.
Claim 4
Dependent Claim 18 words
A portable knapsack frame as described in claim 1 in which the carrier includes a semi-circular shaped tray.

References Cited (Backward Citations)

US2208962A Cited
US3563431A Cited
US3620428A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-05-05 1978-11-04 1979-05-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-05-05 1982-11-04 1983-05-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-05-05 1986-11-04 1987-05-06 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag