Oscillating movement damping means intended for pivotally suspended hoisting gear
AssigneeHiab-Foco Aktiebolag
InventorJan Birger Palmcrantz
Life of this patent
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Abstract
A means to damp the oscillating movements of a hoisting device suspended in a link the upper end of which pivotally mounted about a first horizontal shaft on the outer end of a crane jib and at the lower end of which the hoisting device is pivotally mounted about a second horizontal shaft. A sector-shaped brake disc is mounted at the upper articulation point, the centre of said disc being situated in or close to the centre of said first shaft. At least one brake shoe is provided at the crane jib and arranged to be pressed against the disc at a distance from said first shaft, whereby the desired damping effect is obtained.
Claims11
An improved oscillating movement damping means for a pivotally suspended hoisting device, comprising a link supporting said hoisting device, a first horizontal shaft pivotally mounting the upper end of said link to the outer end of a lifting means, such as crane jib, a second horizontal shaft pivotally mounting said hoisting device to the lower end of said link, the vertical longitudinal medium plane of said second shaft forming an angle, preferably a right angle, to the vertical medium plane of said first shaft, the improvement in which one of the pivoted members is provided with a sector-shaped brake disc at the pivot point of one shaft, said brake disc having its centre approximately in the centre of said one shaft, and the second pivoted member being provided with at least one brake shoe, and a spring arranged to press said brake shoe against said brake disc at a distance from said one shaft.
In a hoisting device including a load-engaging device, a lifting member, and link means suspending said load-engaging member from said lifting member for substantially universal oscillatory motion with respect thereto, said link means including a link member and shaft pivotally connecting said link member with said lifting member, the combination of:
- a brake disc pivoted to and at one end of said shaft and including a sectorial portion radially spaced from said shaft;
- and
- friction means carried by one of said members and engaging said sectorial portion of the brake disc, and spring means positively urging said friction means against said sectorial portion of the brake disc;
- said brake disc also including an arm extending radially from said shaft, and said arm having means anchoring it to the other of said members whereby oscillatory motion between said members about the axis of said shaft is resisted by relative movement between said brake disc and said friction means.
Dependencies are inferred from the claim text.