Apparatus for bending steel bars to form concrete reinforcement

Metal deforming – By use of roller or roller-like tool-element – Comprising tool movable relative to stationary work-portion...

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72306, 72422, B21D 7022, B21D 4320

Patent

active

051829320

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to an apparatus for bending steel bars to form concrete reinforcement elements, having a device for feeding bars to a transfer device, by means of which in each case one group of bars can be inserted between bending members in the transverse direction of the bars


BACKGROUND

In an apparatus of this type known from German Patent 3,010,923, bars compiled in groups by means of stops are fed successively on a sloping plane to the transfer device which feeds the groups of bars lying vertically above one another on a roller runway to a downstream tying device for tying off the group and to a bending machine, in which the group is bent into the desired shape. The main disadvantage of this apparatus consists in the fact that the groups of bars are passed without guiding to the transfer device. The transfer device has a plurality of rows of vertically disposed pairs of rollers; this can lead to malfunctions and misalignment of the bars. It is additionally disadvantageous in the known design that the groups of bars firstly have to be wrapped with tapes or wire or bonded to one another by welding so that they can subsequently be fed to the bending device in the longitudinal direction.
German Patent 3,644,482 discloses an apparatus for processing steel bars, having a tool, e.g. a bending slide, in which apparatus in each case a plurality of bars is transported both towards the bending slide and, after processing, away from the slide transversely to the longitudinal direction by means of arms which are mounted on both sides of the tool and can be swivelled as a unit. In this construction, the bars must be placed manually on the swivel arms. It is furthermore disadvantageous that the bars are not fixed on the swivel arms and, during swivelling of the arms, are held only by one step in the respective swivel arm. A further disadvantage emerges in the fact that the bars to be bent are placed on inclined, ramp-shaped elements and, after the lowering of the swivel arms, slide into an operating channel of the bending device only due to the force of gravity transversely to the longitudinal direction In this process, as a result of the simultaneous feeding of a plurality of bars, a mutual hindrance can take place during sliding, in particular if the bars are long and ribbed, thereby making a defined, orderly arrangement in the operating channel more difficult.


THE INVENTION

It is an object to provide an apparatus which avoids the disadvantages of the known apparatus and guarantees a reliable, simultaneous transfer of a group of bars from the feed device to the bending device. At the same time, the apparatus is intended to allow the satisfactory processing of bar material present in different shapes.
Briefly, according to the invention, the transfer device has at least one pair of operation-controlled gripper tongs which can be swivelled from a receiving position, in which they receive a plurality of bars from the bar feed device and clamp said bars, into an insertion position, in which they insert the bars into the gap between the bending members.
With this construction, a reliable reception of a group of bars is achieved which is held fixedly until it is placed between the bending members and, if appropriate, also during the bending operation so that the bars cannot change their mutual relative position.
In accordance with a preferred embodiment of the invention, the gripper tongs are arranged at the end of a swivel arm which is adjustable in a controlled telescopic manner. In this case, the jaws of the gripper tongs are expediently mounted so as to be jointly swivellable on the swivel arm in the form of a gripper tong head. By this means, the precision of the reception and transfer of the bars is improved.
The swivel arm is advantageously mounted so as to be swivellable on a frame bearing the bending members.
In one design of the invention, in the region of the receiving position of the gripper tongs, the frame has a buffer surface for bars fed by the bar feed device in the t

REFERENCES:
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patent: 3606786 (1971-09-01), Taylor
patent: 3803893 (1974-04-01), Peddinghaus et al.
patent: 3867829 (1975-02-01), Bock
patent: 4311031 (1982-01-01), Schwarze
patent: 4350033 (1982-09-01), Ishihara
patent: 4388039 (1983-06-01), Schwarze
patent: 4479373 (1984-10-01), Montorfano et al.
patent: 4681210 (1987-07-01), Miki et al.
patent: 4766754 (1988-08-01), Shiue
patent: 5020575 (1991-06-01), Grabuschnig et al.

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