Apparatus for opening and closing a wing door of a truck or the like
First Claim
1. A wing door opening/closing apparatus for swinging up a wing door pivotally mounted to a box body of a in the vicinity of a roof portion of the box body so that said wing door overlies said roof portion and lateral sides of said box body, characterized in that the wing door opening/closing apparatus is formed by combining a plurality of wing door opening/closing devices having respective different moment characteristics representing a relationship between a moment caused by the weight of the wing door being rotated and at least one moment generated by the respective wing door opening/closing devices or a relation between the angle of rotation of the wing door and at least one moment generated by the wing door opening/closing devices;
- at least one of said wing door opening/closing devices including a spring for generating a biasing force for swinging up said wing door and a link mechanism for transmitting the biasing force of said spring to said wing door.
1 Assignment
0 Petitions
Accused Products
Abstract
A wing door opening/closing apparatus including a link mechanism and a spring for swinging up a wing door 1. This wing door opening/closing apparatus is made up by plural wing door opening/closing devices A and B. The disparity of the moments generated by one wing door opening/closing device A in the plural wing door opening/closing devices A and B is compensated by a moment generated by the other wing door opening/closing device B.
32 Citations
18 Claims
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1. A wing door opening/closing apparatus for swinging up a wing door pivotally mounted to a box body of a in the vicinity of a roof portion of the box body so that said wing door overlies said roof portion and lateral sides of said box body, characterized in that
the wing door opening/closing apparatus is formed by combining a plurality of wing door opening/closing devices having respective different moment characteristics representing a relationship between a moment caused by the weight of the wing door being rotated and at least one moment generated by the respective wing door opening/closing devices or a relation between the angle of rotation of the wing door and at least one moment generated by the wing door opening/closing devices; at least one of said wing door opening/closing devices including a spring for generating a biasing force for swinging up said wing door and a link mechanism for transmitting the biasing force of said spring to said wing door. - View Dependent Claims (2)
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3. A wing door opening/closing apparatus for swinging up a wing door pivotally mounted to a box body in the vicinity of a roof portion of the box body so that said wing door overlies said roof portion and lateral sides of said box body, characterized in that
the wing door opening/closing apparatus is made up by a plurality of wing door opening/closing devices; -
disparity of a moment produced by one of said wing door opening/closing devices with respect to a moment caused by the weight of the wing door being rotated is compensated by a moment generated by the remaining one(s) of the wing door opening/closing devices;
at least one of said wing door opening/closing devices including a spring for generating a biasing force for swinging up said wing door and a link mechanism for transmitting the biasing force of said spring to said wing door. - View Dependent Claims (4)
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5. A wing door opening/closing apparatus for swinging up a wing door pivotally mounted to a box body in the vicinity of a roof portion of the box body so that said wing door overlies said roof portion and lateral sides of said box body, characterized in that
the wing door opening/closing apparatus is formed by combining a plurality of wing door opening/closing devices having respective different moment characteristics representing a relation between the angle of rotation of the wing door and a moment generated by the wing door opening/closing devices; at least one of said wing door opening/closing devices including a spring for generating the biasing force for swinging up said wing door and a link mechanism for transmitting a biasing force of said spring to said wing door. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
Specification