US3929321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete mixer bowl and method for constructing same
Assignee: Individual
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Filing: 1974-01-16
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Granted: 1975-12-30
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Expires: 1994-01-16
Abstract
Abstract The invention relates to an improved mixer bowl and method for building such bowl for a cement mixer truck from flat sheet metal stock. The formation of the bowl requires the rolling of previously cut and shaped sections and a subsequent stacking of paired ones of the so-constructed and formed curved sections to make the cone shape of the bowl. The method comprises the steps of first cutting various sizes and shapes of sheets from a plurality of standard sheet plates of metal such as steel. These sheet metal sections are then rolled into curved sheets which are in matched pairs, joined end-to-end and then stacked to complete the bowl. The sections are cut with straight sides and when rolled such sides become convexly shaped. By cutting the sections from aligned stock pieces it is possible to reduce scrap while at the same time reducing the number of cuts necessary to produce the total required number of sections. The convexly shaped sides of the rolled sections are interfitted and welded to make the finished bowl.
Inventors
- 👤 Royal W Sims
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:15
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/02; B21D51/10; B28; B28C; B28C5/00; B28C5/42; B28C5/4203; B28C5/4268; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/49796; Y10T29/49826; Y10T29/49893
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A process for making a concrete mixer bowl container comprising the steps of: cutting complementary pairs of rectilinearly sided sections from flat sheet metal stock, bending such sections into arcuate shapes and simultaneously develop edges which are in a plane non-normal to the axis of rotation of the bowl, joining said complementary pairs of such sections to form complete conical circumferential sectors having at least one convexly shaped edge, interfitting intermediate confronting edges which are complementary convexly shaped edges of said complete circumferential sectors to form a larger conical sector and permanently joining the confronting convexly shaped surfaces of respective conical sections to form a container.
Claim 2
Dependent Claim
106 words
A process for making a concrete mixer bowl container comprising the steps of: cutting complementary pairs of rectilinearly sided sections from flat sheet metal stock, bending such sections into arcuate shapes and simultaneously develop edges which are in a plane non-normal to the axis of rotation of the bowl, joining said complementary pairs of such sections to form complete conical circumferential sectors having at least one convexly shaped edge, interfitting intermediate confronting edges which are complementary convexly shaped edges of said complete circumferential sectors to form a larger conical sector and permanently joining the confronting convexly shaped surfaces of respective conical sections to form a container.
Claim 3
Dependent Claim
42 words
The process in accordance with claim 1 including the step of: abutting the edges of a plurality of flat sheet metal strips, and performing the cutting operations whereby cut lines on said strips form common boundary surfaces for more than one section.
Claim 4
Dependent Claim
44 words
The process in accordance with claim 1 wherein selected ones of said sections are cut from sheet metal stock with a convexly shaped surface to provide a planar edge of said sections as such sections are formed from a flat to a curvilinear shape.
Claim 5
Dependent Claim
114 words
A process for forming a conical bowl for concrete mixers and the like comprising the steps of: cutting from flat sheet metal stock a plurality of complementary pairs of sections having inclined sides and at least one straight edge, bending such sections whereby the original straight edge is formed into a convex edge which is non-normal to the axis of the conical bowl axis of rotation, joining the respective inclined edges of complementary pairs of said sections to form a partial conical sector, interfitting the convexly shaped edges of such conical sectors to form a complete conical shape for the bowl, and welding such vertically inclined edges together to form a complete conical enclosure.
Claim 6
Dependent Claim
114 words
A process for forming a conical bowl for concrete mixers and the like comprising the steps of: cutting from flat sheet metal stock a plurality of complementary pairs of sections having inclined sides and at least one straight edge, bending such sections whereby the original straight edge is formed into a convex edge which is non-normal to the axis of the conical bowl axis of rotation, joining the respective inclined edges of complementary pairs of said sections to form a partial conical sector, interfitting the convexly shaped edges of such conical sectors to form a complete conical shape for the bowl, and welding such vertically inclined edges together to form a complete conical enclosure.
Claim 7
Dependent Claim
48 words
The process in accordance with claim 4 including the step of forming at least one edge of the section constituting the lowermost bowl section of arcuate configuration so that such edge is of planar configuration at the time of forming the lowermost section from flat to curved shape.
Claim 8
Dependent Claim
13 words
A concrete mixer bowl constructed in accordance with the process of claim 4.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |