Electric heating – Metal heating – Wire – rod – or bar bonding
Patent
1988-12-01
1991-05-07
Shaw, Clifford C.
Electric heating
Metal heating
Wire, rod, or bar bonding
219 87, B23K 1100
Patent
active
050138790
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention relates to an arrangement in welding machines of the type comprising at least one welding electrode member which serves as tongs and is adapted to spot-weld a longitudinal reinforcement wire or rod to a transversal reinforcement wire or across pin, while forming a mesh, at least one type of cross pin having an attachment plate preferably tangentially arranged thereon.
BACKGROUND OF THE INVENTION
In most large lightweight concrete elements, use is made of a reinforcement in the form of a bent welded mesh or so-called cage. Such cages are manufactured in that a number of longitudinal reinforcement steel wires are welded to transversal wires or pins in a welding machine for this particular purpose, while forming a planar mesh which is then bent so as to fit in the lightweight concrete element. Each cage is adapted to or fixed in the mould prior to or in direct connection with the casting of the fresh concrete which forms the lightweight concrete. The cage is suspended in the mould by means of a holding means comprising a number of vertical needles which are connected with a corresponding number of metal plates provided with holes and serving as attachment members, said plates being arranged on some of the cross pins included in the mesh or cage depending on the length of the lightweight concrete element, the number of attachment plates varies, and they may occur on, e.g., every five to ten cross pins of the mesh.
Conventional type welding machines usually comprise magazines which allow the cross pins to fall or roll down to the longitudinal rods, the cross pins being retained in the desired positions by means of magnets or the like until secured by the welding tongs. Such machines involve considerable difficulties in supplying plate-carrying cross pins, since the plates must be oriented in a certain direction and cannot be allowed to swing. From considerations of space, it has, in actual practice, further been impossible to install twin magazines for different types of cross pins, i.e. naked pins and plate-carrying pins. As a rule, this problem has been solved in that the plate-carrying cross pins are welded manually in a separate operation. An alternative solution is to fix the pins in a welding fixture which is then advanced through the welding machine, but in this case, the freedom of choosing the number of pins is restricted.
BRIEF DESCRIPTION OF THE INVENTIVE IDEA
The object of the present invention is to eliminate the above-mentioned problems and to provide, by simple means, an arrangement which in a reliable manner secures exact positioning of the plate-carrying cross pins such that they can be welded in the same operation as the naked cross pins. These and other objects are achieved by means of the characteristic features of the present invention in that between the welding tongs and one or more magazines containing cross pins, a carrier reciprocates which comprises an upwardly opening seat adapted to receive a lying cross pin from the overlying magazine and, adjacent to said seat, a stop member adapted, when the carrier reaches an end position where the cross pin is turned over to the welding tongs, to retain the attachment plate in a repeatable predetermined weld rotation position, in horizontal direction.
In a preferred embodiment, the carrier consists of a connecting rod included in a connecting-rod mechanism, one end of said connecting rod being connected with a wheel included in the mechanism via a hinge spaced from the center of rotation of said wheel, and the opposite end being provided with .said seat and engaging a support positioned between the connecting-rod wheel and the welding tongs, the connecting rod being adapted to receive a cross pin from the magazine in a first end position where said hinge during rotation of the connecting-rod wheel is substantially most remote from the welding tongs, and to transfer said cross pin to the welding tongs in a diametrically opposed second end position after half a turn of said wheel, and during c
REFERENCES:
patent: 3497659 (1970-02-01), Ritter et al.
patent: 4748309 (1988-05-01), Ritter et al.
Shaw Clifford C.
Ytong AG
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