Buckles – buttons – clasps – etc. – Strap tighteners – Accordion straps
Patent
1991-05-02
1992-04-14
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Strap tighteners
Accordion straps
24 68R, B25B 2500
Patent
active
051035367
ABSTRACT:
A tensioning assembly for the stepwise tightening and releasing of a tensioning strap includes a frame (1), a tensioning lever (2), and a wind-up spindle (4) supporting ratchet wheels (3, 3'). A driving pawl (19) which is movably mounted on the tensioning lever (2) serves to rotate the wind-up spindle (4) when the strap is being tightened. Reverse rotation of the wind-up spindle (4) is prevented by a pair of locking pawls (5, 5') which are movably mounted on the frame (1). The lower or bearing end of the tensioning lever (2) has an unlatching cam (37) which permits the locking pawls (5, 5') to be alternatingly moved out of engagement with the teeth of the ratchet wheels (3, 3'), thus promoting safety by relieving the strap tension in stages. An isolating cam (40) at the bearing end of the tensioning lever (2) permits both locking pawls (5, 5') to be disengaged after the strap tension has been reduced.
REFERENCES:
patent: 4199182 (1980-04-01), Sunesson
patent: 4227286 (1980-10-01), Holmberg
patent: 4570305 (1986-02-01), Smetz et al.
patent: 4584742 (1986-04-01), Speich
patent: 4622721 (1986-11-01), Smetz et al.
Lueger, "Lexikon Der Technik" (Encyclopedia of Technology), vol. 1 (1960), pp. 530-531.
Sakran Victor N.
Spanset Inter AG
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