A novel umbrella includes a support post, a housing supported thereby, spokes pivotally disposed about the housing, a canopy, and an actuator. The housing has a top hub and a bottom hub. The actuator slides the hubs together to pivot the spokes away from the housing, whereby the umbrella moves from a closed position to an open position. Rollers are retained within the top hub, and each spoke has a spoke cam attached to one end. The spokes pivot away from the housing by having a roller surface of each spoke cam slide along each respective roller. The actuator may include a beam pivotally disposed about the support post, a strut pivotally disposed about the support post and coupled to the beam, a car slide slideably disposed within the beam, and a cable coupled to the strut and the housing.
1. An umbrella having a closed position and an open position, the umbrella comprising:
a support post;
a housing supported by the post, wherein the housing has a top hub and an opposing bottom hub, wherein the top hub and bottom hub are slideably engageable with one another;
one or more spokes having a first end and an opposing second end, wherein the first end of each spoke is pivotally disposed between the top hub and the bottom hub;
one or more rollers retained within the top hub, wherein the one or more spokes have a spoke cam having a roller surface;
a canopy disposed about the one or more spokes; and
an actuator for sliding the top hub and bottom hub together to pivot the one or more spokes away from the housing, whereby the umbrella moves from the closed position to the open position.
2. The umbrella of claim 1 , wherein the top hub has a tubular prong extending downward therefrom, and wherein the bottom hub has a prong receptacle extending upward therefrom, the prong receptacle adapted to receive the tubular prong.
3. The umbrella of claim 2 , wherein the tubular prong slides within the prong receptacle as the umbrella moves from the closed position to the open position.
4. The umbrella of claim 1 , wherein the one or more spokes pivot away from the support post by having the roller surface of each spoke cam slide along each respective roller.
5. The umbrella of claim 1 , wherein the bottom hub has one or more cam channels for respectively receiving the one or more spoke cams.
6. The umbrella of claim 1 , further comprising a cover plate having one or more rollers channels for respectively receiving the one or more rollers.
7. The umbrella of claim 1 , wherein the actuator includes a beam pivotally disposed about the support post, a strut pivotally disposed about the support post and coupled to the beam, a car slide slideably disposed within the beam, and a cable coupled to the strut and the housing.
8. The umbrella of claim 7 , wherein the car slide moves toward the top end of the support post when the umbrella goes from the closed position to the open position, wherein movement of the car slide pivots the beam and the strut away from the support post for tensioning the cable connected to the strut and the housing, whereby the top hub and bottom hub slide closer to one another causing the one or more spokes to pivot away from the housing.
9. The umbrella of claim 8 , further comprising a first pulley disposed within a top cavity of the top hub, wherein the cable runs from one end of the strut through the beam and into the top cavity of the top hub, around the first pulley, through a tubular prong, and stops at an anchor point disposed about the bottom hub.
10. An umbrella comprising:
a support post;
a housing having a top hub and an opposing bottom hub, wherein the top hub is disposed substantially apart from the bottom hub when the umbrella is in a closed position, and wherein the top hub is disposed substantially adjacent to the bottom hub when the umbrella is in an open position;
one or more spokes having a first end and an opposing bottom end, wherein the first end of each spoke is pivotally disposed between the top hub and the bottom hub, wherein the one or more spokes are substantially parallel to the support post when the umbrella is in the closed position, and wherein the one or more spokes are substantially orthogonal to the support post when the umbrella is in the open position;
one or more rollers retained within the top hub, wherein the one or more spokes have a spoke cam having a roller surface;
a canopy disposed about the one or more spokes; and
an actuator for moving the top hub and bottom hub toward one another to cause the one or more spokes to pivot away from the housing to move the umbrella from the closed position to the open position, wherein the actuator includes a beam pivotally disposed about the support post, a strut pivotally disposed about the support post and coupled to the beam, a car slide slideably disposed within the beam, and a cable coupled to the strut and the housing.
11. The umbrella of claim 10 , wherein the car slide moves toward the top end of the support post when the umbrella goes from the closed position to the open position, wherein movement of the car slide pivots the beam and the strut away from the support post for tensioning the cable connected to the strut and the housing, and wherein the one or more spokes pivot away from the housing by having the roller surface of each spoke cam slide along each respective roller.