Patent US4302318A successfully refreshed from Google Patents.
Patent US4198720A successfully refreshed from Google Patents.
← Back to Patent Explorer
US4198720A Expired / Lapsed US ⏱️ 0.0 years remaining

Dirt remover for water tank

Assignee: Individual
•
Filing: 1978-09-14
•
Granted: 1980-04-22
•
Expires: 1998-09-14
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A dirt remover for a water tank, which can readily remove not only the dirt floating on the water surface and the dirt suspended in the water but also the dirt settling to the tank bottom without inflicting any injury on the bottom surface of the tank, includes a frame formed of a rear frame member, two lateral frame members extending forward from the opposite ends of the rear frame member, and a frontal frame member set in position straight between the leading ends of the two lateral frame members. A net is hung from the inner sides of the frame loosely enough for the middle portion thereof to sag down, the net forming a scooping portion in conjunction with the frame. A handle has a leading end thereof attached to the rear frame member of the frame, the handle serving for the operation of the scooping portion. A plate-shaped sliding piece made of a material possessing proper degrees of rigidity and elasticity is fastened to the frontal frame member of the frame throughout the entire length thereof in such a way that the leading end of the sliding piece will protrude from the scooping portion.

Inventors

  • 👤 Akio Matsumoto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 23:05
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/14; E04H4/16; E04H4/1609

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 238 words
A dirt remover for removing dirt from a water tank, said dirt remover comprising: a frame formed of a rear frame member, two lateral frame members extending forwardly from opposite ends of said rear frame member, and a straight frontal frame member positioned between leading ends of said two lateral frame members; two connecting members for connecting opposite ends of said frontal frame member to respective said leading ends of said two lateral frame members, each said connecting member having a first insertion hole for receiving therein the said leading end of the respective said lateral frame member, and a second insertion hole for receiving therein the respective said end of said frontal frame member, said first and second insertion holes extending perpendicular to each other, and each said connecting member having extending therefrom an integrally formed protuberance; a net hung from inner sides of said frame loosely enough for a middle portion of said net to sag downwardly, said net and frame forming a scooping portion; a handle including a leading end attached to said rear frame member of said frame, said handle forming means for manipulating said scooping portion; and a plate-shaped sliding piece made of a material having desired degrees of rigidity and elasticity, said sliding piece being attached to said frontal frame member of said frame throughout the entire length thereof, said sliding piece having a leading edge protruding outwardly from said scooping portion.
Claim 2
Dependent Claim 238 words
A dirt remover for removing dirt from a water tank, said dirt remover comprising: a frame formed of a rear frame member, two lateral frame members extending forwardly from opposite ends of said rear frame member, and a straight frontal frame member positioned between leading ends of said two lateral frame members; two connecting members for connecting opposite ends of said frontal frame member to respective said leading ends of said two lateral frame members, each said connecting member having a first insertion hole for receiving therein the said leading end of the respective said lateral frame member, and a second insertion hole for receiving therein the respective said end of said frontal frame member, said first and second insertion holes extending perpendicular to each other, and each said connecting member having extending therefrom an integrally formed protuberance; a net hung from inner sides of said frame loosely enough for a middle portion of said net to sag downwardly, said net and frame forming a scooping portion; a handle including a leading end attached to said rear frame member of said frame, said handle forming means for manipulating said scooping portion; and a plate-shaped sliding piece made of a material having desired degrees of rigidity and elasticity, said sliding piece being attached to said frontal frame member of said frame throughout the entire length thereof, said sliding piece having a leading edge protruding outwardly from said scooping portion.
Claim 3
Dependent Claim 13 words
A dirt remover as claimed in claim 1, wherein said frame is rectangular-shaped.
Claim 4
Dependent Claim 19 words
A dirt remover as claimed in claim 1, wherein said plate-shaped sliding piece is formed of highly foamed polyethylene.
Claim 5
Dependent Claim 70 words
A dirt remover as claimed in claim 1, wherein said frontal frame member comprises two straight bars each having therein through-holes, said two straight bars being positioned with the front edge of said net and the rear edge of said sliding piece interposed therebetween, and rivets extending through said through-holes and tightly joining said two bars, said front edge of said net and said rear edge of said sliding piece.

References Cited (Backward Citations)

US277266A Cited
US3188668A Cited
US3220037A Cited
US4003100A Cited
US3979146A Cited
US4053412A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1983-04-22 1983-10-22 1984-04-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1987-04-22 1987-10-22 1988-04-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1991-04-22 1991-10-22 1992-04-22 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag