US3912438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Container manufacturing apparatus
Assignee: Individual
•
Filing: 1974-02-05
•
Granted: 1975-10-14
•
Expires: 1994-02-05
Abstract
Abstract The invention provides a deep drawing and moulding apparatus for forming lipped containers such as cups from softened thermoplastics sheet. The mould is in two parts. The upper rim of the lower part forms the upper part of the container. The lower rim of the upper part, during mould closure, clamps the upper part of the container against the lower part of the mould, and bends over outwards and thickens a rim portion of the thermoplastics sheet to form a lip. The last part of the mould movement brings together two cutting parts of the mould, one on the upper and one on the lower part, to trim the lip.
Inventors
- 👤 Pietro Padovani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:42
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/38; B26F1/40; B29; B29C; B29C51/00; B29C51/26; B29C51/30; B29C51/32; B29C51/325; B65; B65D; B65D1/00; B65D1/22; B65D1/26; B65D1/265; B26F1/44; B26F2001/4427
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
236 words
Apparatus for moulding an encircling lip on a thermoplastic upper wall edge defining a top opening of a container, comprising a lower mould part having an upper edge and arranged to abut on the outer surface of the upper wall region of said container, an upper mould part displaceable in an axial direction with respect to said lower mould part, arranged to be displaceable so as to abut on the inside surface of the upper wall region of said container for squeezing material from the upper wall region of said container upwardly beyond said upper edge of said lower mould part, and defining an inverted open recess overlapping said lower mould part and extending around said upper edge thereof for guiding the squeezed material around and downwardly beyond said upper edge of said lower mould part, a normally stationary cutter with a cutting edge located on the outer surface of said lower mould part at an elevation lower than and situated outwardly beyond said upper edge thereof, and an axially displaceable cutter located on an outer rim of said upper mould part and also having a cutting edge, the cutting edge of said stationary cutter and the outer rim of said upper mould part in the position of closest proximity to each other forming a cutting opening the height of which is greater than the thickness of the sheet material from which said container is made.
Claim 2
Dependent Claim
236 words
Apparatus for moulding an encircling lip on a thermoplastic upper wall edge defining a top opening of a container, comprising a lower mould part having an upper edge and arranged to abut on the outer surface of the upper wall region of said container, an upper mould part displaceable in an axial direction with respect to said lower mould part, arranged to be displaceable so as to abut on the inside surface of the upper wall region of said container for squeezing material from the upper wall region of said container upwardly beyond said upper edge of said lower mould part, and defining an inverted open recess overlapping said lower mould part and extending around said upper edge thereof for guiding the squeezed material around and downwardly beyond said upper edge of said lower mould part, a normally stationary cutter with a cutting edge located on the outer surface of said lower mould part at an elevation lower than and situated outwardly beyond said upper edge thereof, and an axially displaceable cutter located on an outer rim of said upper mould part and also having a cutting edge, the cutting edge of said stationary cutter and the outer rim of said upper mould part in the position of closest proximity to each other forming a cutting opening the height of which is greater than the thickness of the sheet material from which said container is made.
Claim 3
Dependent Claim
60 words
Apparatus as recited in claim 2, wherein, between said cutting opening and the section of the outer surface of said lower mould part located above said stationary cutter, a chamber is formed when said stationary cutter and said upper mould part are closest, the dimension of said chamber in a radial extension being greater than the thickness of said sheet.
Claim 4
Dependent Claim
37 words
Apparatus as recited in claim 2 wherein said stationary cutter after severing the sheet is axially displaceable and in which the upper surface thereof adjacent to its cutting edge is formed to act as an upsetting tool.
Claim 5
Dependent Claim
34 words
Apparatus as recited in claim 3, wherein the surface of said upper mould part abutting on the upper wall region of said container is curved inwardly at the lower end of said wall region.
References Cited (Backward Citations)
US1935832A
Cited
US3011212A
Cited
US3173174A
Cited
US3338997A
Cited
US3260781A
Cited
US3357053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |