Door brake
First Claim
1. A brake assembly to control the movement of a first member, said first member hingedly mounted on a second member, said first member being movable between a first position and a second position, said brake assembly comprising:
- a base mounted to one of said first and second members;
a torsion bar rotatably journalled on said base, said torsion bar having one end mounted to one of said first and second members and an opposite end mounted to the other of said first and second members;
link means for pivotable movement with respect to said torsion bar, said link means having one end connected to one of said first and second members;
lever means for oscillatory movement with said torsion bar, said lever means being mounted to said torsion bar, said lever means being spaced from said link means and having one end connected to one of said first and second members; and
spaced stop means for limiting the oscillatory movement of said lever means, said spaced stop means mounted to the other of said first and second members, said lever means engaging said stop means as said lever means oscillates between a first predetermined rotatable position and a second predetermined rotatable position opposite to said first predetermined position;
whereby as said lever means and second predetermined rotatable positions, said lever means is stopped oscillates and engages said stop means at one of said first while said torsion bar continues to rotate to generate and transmit a braking force to said link means.
1 Assignment
0 Petitions
Accused Products
Abstract
A door brake assembly (20) to control the closing of a dipper door (11) on a shovel dipper (10) has a torsion bar (39) connected to the dipper door (11) by links (15, 32). A lever (48) on the other end of the torsion bar (39) selectively engages spaced snubbers (57, 58) to provide a braking (or damping) action to the dipper door (11) in the last portion of its travel to the open or closed position. The torsion bar (39) is mounted in journals (23, 24, 43, 44) on a base (22) mounted on the dipper (10). Usually, each dipper door (11) is provided with a pair of the brake assemblies (20) mounted in mirror image.
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Citations
8 Claims
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1. A brake assembly to control the movement of a first member, said first member hingedly mounted on a second member, said first member being movable between a first position and a second position, said brake assembly comprising:
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a base mounted to one of said first and second members; a torsion bar rotatably journalled on said base, said torsion bar having one end mounted to one of said first and second members and an opposite end mounted to the other of said first and second members; link means for pivotable movement with respect to said torsion bar, said link means having one end connected to one of said first and second members; lever means for oscillatory movement with said torsion bar, said lever means being mounted to said torsion bar, said lever means being spaced from said link means and having one end connected to one of said first and second members; and spaced stop means for limiting the oscillatory movement of said lever means, said spaced stop means mounted to the other of said first and second members, said lever means engaging said stop means as said lever means oscillates between a first predetermined rotatable position and a second predetermined rotatable position opposite to said first predetermined position; whereby as said lever means and second predetermined rotatable positions, said lever means is stopped oscillates and engages said stop means at one of said first while said torsion bar continues to rotate to generate and transmit a braking force to said link means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification