US4915549A | 1990-04-10 | |||
DE19528282A1 | 1997-02-13 | |||
DK152696B | 1988-04-18 |
Background to invention Panels are usually fastened together by means of screws supplie on a belt or picked up manually, and tightened with hand-held, power screwdrivers, a procedure which places a strain on the arms and shoulders. This is also a monotonous and time-consuming task since the panels are usually joined by about 10-15 screws per square metre, and large numbers of screws must be installe in structures built from panels.
Figures Fig. 1 shows the automatic fastening device from the operator's side.
Fig. 2 shows the automatic fastening device from the work object side.
Description The reference numbers stated on the figures indicate the following: Linear unit 1, motors 2, suction cups 3, compressed air cylinder 4, work head holder 5, fastener holder 6, control box 7, handle 8, compressed air cylinder 9, counter-stop 10, wheels 11, axle 12, bearing 13, fastener arranger 14, hoses 15, starter button 16, pushbutton 17 and work head 20.
Designated 1 on the figures, the linear unit is the part which can traverse the work head 20 between it's (the linear unit's) end positions when installing the fasteners. When starter button 16 is operated, the fastener arranger 14 is started and the cylinder 9 presses the automatic fastening device against the panel. The ejector then begins to develop vacuum in the suction cups which hold the automatic fastening device in contact with the work object. Pushbutton 17 is activated when the correct vacuum has been reached and only then can screw tightening be commenced. At this point, the screws shall already be located in the fastener holder 6, which are pressed against the panel by the compressed air cylinder 4, the motors 2 starting when the correct contact pressure with the panel has been reached. The screws are screwed in to a predetermined depth.
When the screws have been tightened to the correct depth, the work head holder 5 is reversed while new screws are blown into the fastener holder 6 and the work head 20 is traversed along the linear unit 1 to the next position. When the work head 20 has reached the last position, new screws are blown into the fastener holder 6 and the work head 20 is traversed to the other end of the linear unit 1 in readiness for the next cycle.
Purpose of invention The main purpose of the present invention is to install and tighten panel screws, primarily as part of building and installation works, and to reduce the occupational injuries which occur when the task is carried out using hand-held tools, also to save time by installing a number of screws simultaneously. In addition, other working tasks can be carried out while changing the working head (20).
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