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US 4,610,197 AGranted
Damper blade construction
AssigneePhilips Industrial Components, Inc.
InventorRobert M. Van Becelaere
Life of this patent
Estimating the term…
Abstract
A hollow airfoil damper blade formed by sheet metal. The walls of the blade are formed by two sheets crimped together at the edges. The blade tapers from the center toward the edges and has two pairs of V-shaped stiffening ribs formed by corrugations in the sheets. The ribs project nearly one half the blade thickness to enhance the strength of the blade and its resistance to deflection. The ribs cooperate to form a channel which closely receives a stub axle in each of its ends to provide for pivotal mounting of the damper blade. The axles are contacted directly by and welded to each of the ribs.
Claims20
In a damper blade construction, the improvement comprising:
- a hollow airfoil shaped blade having opposite walls formed of sheet material and cooperating to form a central portion of the blade and a pair of generally parallel edges on opposite sides of said central portion, said walls converging toward said edges to provide the blade with a tapered configuration from said central portion toward each edge;
- a first pair of stiffening ribs on said central portion of the blade projecting a substantial distance into the blade from one of said walls and formed by corrugations in the sheet material of said one wall, said ribs in the first pair extending substantially the full length of said blade and being spaced apart from one another;
- a second pair of stiffening ribs on said central portion of the blade projecting a substantial distance into the blade from the other wall and formed by corrugations in the sheet material of said other wall, said ribs in the second pair extending substantially the full length of said blade and being spaced apart from one another substantially the same distance as the ribs in said first pair;
- a channel extending through said central portion of the blade and having opposite ends on opposite ends of the blade, located between the ribs in said first and second pairs;
- and
- a pair of stub axles extending into said opposite ends of said channel in contact with each rib in said first and second pairs to provide a damper axis, said axles being embraced by said ribs and being rigidly secured to each of said ribs to effect turning of the blade about said damper axis in response to turning of the axles.
3 more elements
A damper blade construction comprising:
- a hollow airfoil shaped blade having opposite walls formed of sheet material and cooperating to form a control portion of the blade having a preselected depth and a pair of generally parallel edges on opposite sides of said central portion, said walls converging toward said edges to provide the blade with a tapered configuration from said central portion toward each edge;
- a first pair of spaced apart stiffening ribs on said central portion of the blade projecting into the blade from one of said walls a distance substantially equal to one half said preselected depth, said ribs in the first pair being formed by corrugations in said one wall extending substantially the full length of the blade;
- a second pair of spaced apart stiffening ribs on said central portion of the blade projecting into the blade from the other wall a distance substantially equal to one half said preselected depth, said ribs in said second pair being formed by corrugations in said other wall extending substantially the full length of the blade in opposition to the corrugations which form the ribs in said first pair;
- a channel extending through said central portion of the blade and defined within cooperating surfaces on said ribs in the first and second pairs, said channel having opposite ends on opposite ends of the blade;
- and
- a pair of stub axles extending into said opposite ends of the channel, said axles contacting and being secured to each of said cooperating surfaces on the ribs to rigidly secure the axles to the blade for turning of the blade in response to turning of the axles.
3 more elements
A damper blade construction comprising:
- a pair of sheet members cooperating to form a hollow airfoil shaped blade tapered from a central portion thereof toward generally parallel edge portions on opposite sides of said central portion, said sheet members being interlocked at said edge portions;
- a first pair of spaced apart stiffening ribs formed by corrugations in one of said sheet members in said central portion of the blade, said ribs in the first pair projecting into the blade and extending parallel to one another substantially the full length of the blade;
- a second pair of spaced apart stiffening ribs formed by corrugations in the other sheet member, said ribs in the first and second pairs cooperating to define a substantially enclosed channel bounded by surfaces of the ribs and having opposite ends;
- and
- a pair of stub axles extending into said opposite ends of the channel and cooperating to provide a damper axis about which the blade can turn, said axles contacting each of said surfaces of the ribs and being secured thereto.
2 more elements
Dependencies are inferred from the claim text.