Patent US3774509A successfully refreshed from Google Patents.
US3774509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for making bags
Assignee: Schweizerische Industrie Gesellschaft
•
Filing: 1972-08-21
•
Granted: 1973-11-27
•
Expires: 1992-08-21
Abstract
Abstract A device for making bags is provided with an upright forming tube over which a tubular structure made of flexible sealable sheet material is moved downwardly step-by-step to be provided at its lower end, when projecting freely from the forming tube with a bottom by means of bottom seam dies during an interval the forming tube is moved upwardly while the tubular structure is clamped against movement. Subsequently, a double gripper seizes folded margins of the bottom and pulls the tubular structure downwardly and then the bag so formed is severed from the tubular structure.
Inventors
- 👤 H Heinzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:20
CPC Classifications
B; B31; B31B; B31B50/00; B31B70/00; B31B70/26; B31B2105/00; B31B2120/00; B31B2120/40; B31B2120/402; B31B2120/407
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
192 words
Device for making bags comprising an upright forming tube over which a tubular structure made of a flexible sealable sheet material is moved and withdrawn therefrom by gripping means engaging said tubular structure at the lower discharge end of said forming tube, oppositely movable bottom seam dies for forming the bottom of said bag, and means for severing said bag from said tubular structure, wherein the improvement comprises reciprocable control members arranged at the discharge end of said forming tube for periodically engaging said tubular structure so as to hold it against displacement and to release two opposite lower margins of said tubular structure from the lower edges of the forming tube during a subsequent upward movement of said forming tube, said bottom seam dies forming said bottom of said bag during an upward movement of said forming tube by engaging and folding said two released and exposed lower margins of said tubular structure, said gripping means comprising a double gripper having two pairs of clamping jaws which grip the exposed folded margins to pull the bag formed downwardly to permit said severing means to cut said bag from said tubular structure.
Claim 2
Dependent Claim
192 words
Device for making bags comprising an upright forming tube over which a tubular structure made of a flexible sealable sheet material is moved and withdrawn therefrom by gripping means engaging said tubular structure at the lower discharge end of said forming tube, oppositely movable bottom seam dies for forming the bottom of said bag, and means for severing said bag from said tubular structure, wherein the improvement comprises reciprocable control members arranged at the discharge end of said forming tube for periodically engaging said tubular structure so as to hold it against displacement and to release two opposite lower margins of said tubular structure from the lower edges of the forming tube during a subsequent upward movement of said forming tube, said bottom seam dies forming said bottom of said bag during an upward movement of said forming tube by engaging and folding said two released and exposed lower margins of said tubular structure, said gripping means comprising a double gripper having two pairs of clamping jaws which grip the exposed folded margins to pull the bag formed downwardly to permit said severing means to cut said bag from said tubular structure.
Claim 3
Dependent Claim
64 words
Device according to claim 1, in which two oppositely disposed walls (18) of said forming tube (4) are provided at their lower ends with recesses in which parts (14) are slidably inserted against which the tubular structure is periodically pressed by exteriorly arranged pressure members (30), said parts and pressure members forming said control means which periodically hold said tubular structure against slidable displacement.
Claim 4
Dependent Claim
60 words
Device according to claim 1, in which said bottom seam dies (33, 34) are provided with wedge-shaped projections at their upper faces which come to lie below said forming tube during the formation of the bottom of the bag and together with pointed lower edges (65) of the wide faces (26) of the forming tube produce said folded margins (60).
Claim 5
Dependent Claim
40 words
Device according to claim 1, in wHich said bottom seam dies (33, 34) are shaped in such a manner that the same produce during the formation of the bottom of the bag in the bottom seam (62) a kink (66).
Claim 6
Dependent Claim
101 words
Device according to claim 1, including an upwardly and downwardly movable expander device (19) in said forming tube (4) said expander device comprising two intersecting expander arms (22), the lower end of which are adapted to engage opposite parts of said tubular structure immediately prior to the formation of the bottom seam (62) above said bottom seam dies (33, 34) to expand said tubular structure laterally beyond the perimeter of said forming tube (4), and including upwardly and downwardly movable presser members (44) for subsequently forming double folding parts (68) from said tubular structure pressed upon the closed dies (33, 34).
Claim 7
Dependent Claim
47 words
Device according to claim 1, including gusset folding means (69) disposed directly above said bottom seam dies (33, 34), said gusset folding means have points (70) facing said tubular structure (6) and which when moved inwardly produce turned in folded gussets (71) directly against the bottom (60).
Claim 8
Dependent Claim
66 words
Device according to claim 1, including means for forming said tubular structure, said forming means comprising a folding box (5) and a longitudinal seam forming die (8) extending lengthwise of the tubular structure after it has been folded, said forming means being provided with a supply roll from which a web of flexible material is drawn into said folding box to form therein said tubular structure.
Claim 9
Dependent Claim
39 words
Device according to claim 7, in which said forming tube is surrounded by said folding box and in which said tubular structure is formed around said forming tube in the circumferential space between the latter and said folding box.
References Cited (Backward Citations)
US2294215A
Cited
US2623441A
Cited
US3094905A
Cited
US3263391A
Cited
US3464181A
Cited
US3680446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |