§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US3779121A Expired / Lapsed US ⏱️ 0.0 years remaining

Sheet material cutting apparatus

Assignee: SOFAMECA Sarl
•
Filing: 1971-07-16
•
Granted: 1973-12-18
•
Expires: 1991-07-16
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract This invention relates to apparatus for cutting sheet material, particularly material in sheath form for manufacturing bags. A cutting blade is detachably secured to a movable member which is arranged for movement over a rectilinear guide member that is fixed to a support, and this movable member is constituted by a double piston which is mounted to slide in a tube. The tube is shaped to offer at each of its ends a cylinder which forms, with the adjacent face of the piston, a chamber of varying size arranged to be supplied with operating fluid under pressure, through at least one conduit that discharges into the chamber. In one form, the tube is longitudinally slotted to receive a part of the movable member and this part extends outside the tube and carries the cutting blade. In another form, the guide member is constituted by a rail on which slides a carriage that comprises the movable member and carrying the double piston for alternate engagement by its two ends in two cylinders that are arranged at the two ends of the rail.

Inventors

  • 👤 G Lagain

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 05:16
CPC Classifications
B; B26; B26D; B26D5/00; B26D5/08; B26D5/086; B26D1/00; B26D1/01; B26D1/04; B26D1/045; B26D5/12; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/8821; Y10T83/8822; Y10T83/8858

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 84 words
An apparatus for cutting sheet material comprising a support, a rectilinear guide member fixed to the support, a cylinder disposed above the guide member, a double piston slidably disposed in the cylinder, a cutting blade carried by the piston, means for admission of fluid under pressure into each end of the cylinder, and separate means for the escape of fluid through a sidewall of the cylinder near each end thereof whereby a compression chamber is provided each side of the piston in the cylinder.
Claim 2
Independent Claim 84 words
An apparatus for cutting sheet material comprising a support, a rectilinear guide member fixed to the support, a cylinder disposed above the guide member, a double piston slidably disposed in the cylinder, a cutting blade carried by the piston, means for admission of fluid under pressure into each end of the cylinder, and separate means for the escape of fluid through a sidewall of the cylinder near each end thereof whereby a compression chamber is provided each side of the piston in the cylinder.
Claim 3
Dependent Claim 40 words
Apparatus according to claim 1, whrein said tube is longitudinally slotted over the greater central part of said tube and therein is engaged a part of said movable member, said part extending outside said tube and bearing said cutting blade.
Claim 4
Dependent Claim 73 words
Apparatus according to claim 1, wherein said guiding member is formed by a rail on which a carriage is mounted to slide, said carriage constituting said movable member and carrying said double piston for engagement alternately by its two ends in two cylinders arranged at the two ends of said rail, said cylinders being arranged to be supplied with said fluid under pressure through said at least one conduit discharging into said cylinder.
Claim 5
Dependent Claim 24 words
Apparatus according to claim 3, wherein said rail has two opposite grooves wherein are engaged at least two guide runners connected to said carriage.
Claim 6
Dependent Claim 23 words
Apparatus according to claim 4, wherein said movable member comprises two pairs of opposite wheels engaged in said grooves in said guide rail.

References Cited (Backward Citations)

US3088355A Cited
US3213735A Cited
US3137192A Cited
US3277761A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-12-17 1977-06-18 1977-12-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-12-17 1981-06-18 1981-12-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-12-17 1985-06-18 1985-12-18 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag