Metal deforming – By tool-couple pressing together adjacent surface portions... – To form longitudinally-seamed tube
Patent
1984-12-13
1987-02-24
Combs, E. Michael
Metal deforming
By tool-couple pressing together adjacent surface portions...
To form longitudinally-seamed tube
72133, 72196, B21D 3903, B21D 5112, B21D 1304
Patent
active
046447709
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and apparatus for producing spacers or blocks primarily for use in load pallet structures, as supporting element for the load deck and/or as blocks between load deck and stringers, the blocks consisting of sleeves made from sheet metal.
Spacers or blocks of this type, which are incorporated in pallet structures are already described in a published Swedish patent application. The invention according to the latter relates to a method of manufacturing pallets by machine and a pallet manufactured according to the method, said pallets being provided with a deck supported by spacers or blocks and/or stringers. The blocks and/or stringers are preferably combined with fastening means for joining the blocks to the deck, this process taking place in a compression and joining station, the pressing together of deck and blocks taking place in a roll nip under a pressure of sufficient magnitude for causing the blocks to penetrate into the load deck, at least with its upper portion, to a depth such that fixation against rotation of the blocks in relation to its fixed position against the load deck is obtained. Since a pallet is a product which is mass produced today, it is essential that the manufacture of the blocks included in a pallet can be manufactured efficiently, cheaply and at high speed.
The present invention has the object of providing a method of producing spacers or blocks of the type mentioned in the introduction. What is essentially distinguishing for the invention here is that an elongate, substantially rectangular sheet metal blank is fed into a nip formed by at least two corrugated rolls, with its main plane inclined to the plane passing through the axes of the rolls, that the front edge of the blank is fixed at the surface of one roll, that the rolls are subsequently caused to rotate at least one revolution simultaneously as the blank is given a corrugated configuration on its passage through the nip substantially corresponding to the configuration of the corrugations on the rolls, that after fixation of the front edge of the blank against the surface of one roll, and after shaping in the roll nip, the blank is brought into engagement against said surface and accompanies the direction of rotation of the roll until the blank has assumed its sleevelike shape on the roll and that the block is then withdrawn or pushed from the roll in an axial direction.
The present invention also has the object of providing an apparatus for carrying out the above-mentioned method, essentially distinguishing for this apparatus being that it includes at least two opposing, corrugated rolls, the corrugations of which are arranged for meshing and are at a pre-determined distance from each other to make a roll nip for shaping a sheet metal blank, said distance between the corrugations of the surfaces being somewhat larger than the thickness of the sheet metal to be shaped.
By reason of the invention the production of spacers or blocks preferably for use in pallet structures can take place efficiently and economically. The rate of production is as high as 20-30 sleeves per minute. This is feasible, inter alia since the corrugation and circular bending of the block takes place at the same operation. Furthermore, riveting the overlapping portions of the sheet is carried out during the actual shaping of the block. Since a riveting method is used, galvanized sheet can also be used, which is to be preferred because of the many advantages of this material in relation to untreated or painted sheet metal.
The invention will now be described in detail with reference to the appended drawings, on which
FIG. 1 schematically illustrates a perspective view of an apparatus for carrying out the method in accordance with the invention,
FIG. 2 is a side view of the apparatus illustrated in FIG. 1,
FIG. 3 illustrates in a side view how the shaping of the sheet metal blank takes place with the apparatus illustrated in FIGS. 1 and 2, and
FIG. 4 is a side view of an alternative embodiment of a sleeve, shaped
REFERENCES:
patent: 262723 (1882-08-01), Austin
patent: 1731478 (1929-10-01), Widell
patent: 2001553 (1935-05-01), Spencer
patent: 3129489 (1964-04-01), Nelson
patent: 3208140 (1965-09-01), Mayrath
patent: 3447352 (1969-06-01), Miller
Combs E. Michael
Hammarberg Lars
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