Closure fasteners – Bolts – Spring arm
Patent
1988-12-01
1991-12-10
Smith, Gary L.
Closure fasteners
Bolts
Spring arm
292214, 404 25, E05C 1906
Patent
active
050711776
ABSTRACT:
In a cover-frame assembly for a manhole or the like a locking device is provided, which comprises a closing member having at least two horizontal arms and a mounting rod provided with a bearing and actuating device. The mounting rod and the bearing and actuating device are located in a bore having a widened bore portion, whereby a shoulder is formed, on which is supported a bearing surface of the bearing and actuating device. The ends of the arms each project into a guide link, which is shaped on the inner flange of the frame. The guide link has an inclined flank, by means of which the arms are increasingly elastically deformed. In the closed position of the locking device, the arms engage in locking recesses provided on the end of each inclined flank. This leads to a self-closure with pre-tension.
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patent: 611743 (1898-10-01), Stevens
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patent: 4655913 (1987-04-01), Boersma
Galvanetto Francois
Spiess Hansruedi
Milano Michael J.
Smith Gary L.
Von Roll AG
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