Tensioning apparatus for a lashing strap
First Claim
1. A tensioning apparatus for a lashing strap having a fixed end and a free end, comprising:
- a frame having two side walls which extend parallel to one another, the fixed end of the lashing strap being operationally connected to the frame;
a wind-up spindle that is rotatably mounted on the frame and that receives the free end of the lashing strap; and
ratchet mechanism means for securing the wind-up spindle from rotation in a first direction with respect to the frame, the ratchet mechanism means includinga ratchet wheel connected to the wind-up spindle,first and second locking pawls that are mounted on the frame and moveable between an engaged position wherein the locking pawls contact the ratchet wheel and a disengaged position wherein the locking pawls are withdrawn from the ratchet wheel, the first locking pawl having a curved configuration so as to reduce the structural height required for the frame, andbiasing means for biasing the locking pawls toward the engaged position,wherein the first locking pawl is shaped as a ring segment,wherein each side wall of the frame has a respective first pawl guide slot through which the first locking pawl extends, the first pawl guide slots conforming to the curved configuration of the first locking pawl and being shaped as ring segments, andwherein each side wall of the frame additionally has a second pawl guide slot through which the second locking pawl extends.
1 Assignment
0 Petitions
Accused Products
Abstract
A tensioning apparatus for the step-wise tensioning and non-stepped releasing of a lashing strap includes a frame (1; 100), a pivot lever (2) having two pivot arms (16, 16'"'"'), and a ratchet mechanism that includes ratchet wheels (3, 3'"'"') and locking pawls (5, 5'"'"'; 105, 105'"'"'). By using a plurality of locking pawls (5, 5'"'"'; 105, 105'"'"'), the tensioning apparatus is able to absorb a greater lashing force or to tension the lashing strap in locking steps which differ from the tooth pitch t. To release the lashing strap, cams (40) on the pivot arms (16, 16'"'"') of the pivot lever (2) move the locking pawls and thus the ratchet mechanism to a disengaged position. The structural height of the tensioning apparatus and the number of components required for it may be reduced by using curved locking pawls (5, 5'"'"'; 105, 105'"'"'), a curved driving pawl (20), and a leg spring (41) which serves as the sole spring element for biasing the locking pawls.
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Citations
17 Claims
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1. A tensioning apparatus for a lashing strap having a fixed end and a free end, comprising:
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a frame having two side walls which extend parallel to one another, the fixed end of the lashing strap being operationally connected to the frame; a wind-up spindle that is rotatably mounted on the frame and that receives the free end of the lashing strap; and ratchet mechanism means for securing the wind-up spindle from rotation in a first direction with respect to the frame, the ratchet mechanism means including a ratchet wheel connected to the wind-up spindle, first and second locking pawls that are mounted on the frame and moveable between an engaged position wherein the locking pawls contact the ratchet wheel and a disengaged position wherein the locking pawls are withdrawn from the ratchet wheel, the first locking pawl having a curved configuration so as to reduce the structural height required for the frame, and biasing means for biasing the locking pawls toward the engaged position, wherein the first locking pawl is shaped as a ring segment, wherein each side wall of the frame has a respective first pawl guide slot through which the first locking pawl extends, the first pawl guide slots conforming to the curved configuration of the first locking pawl and being shaped as ring segments, and wherein each side wall of the frame additionally has a second pawl guide slot through which the second locking pawl extends. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification