Aerial sheave device
Disclosed is an aerial sheave device for the installation and suspension of cable. The aerial sheave device includes a frame and a rotating wheel that coordinates with a locking cable guard. The device also includes a lockable side latch for affording access to the wheel area. The frame may be attached to a utility pole via a loop attached to the frame. The loop attaches to the frame via dome-inside-a-dome connection which allows the frame to also rotate 360 degrees. The dome-inside-a-dome connection includes a solid semispherical dome attached to the loop which fits inside a slightly larger semispherical dome shaped cavity of the frame.
1. An aerial sheave device for the installation and suspension of cable comprising:
a. a pulley wheel rotating around an axle attached to a frame having a rigid side, a top side, and a latch side;
b. a latch attached to the latch side of the frame for providing access to the wheel of the sheave, operating from an open to a closed position, having a spring loaded plunger biased in the closed position for securing the latch to the frame in the closed position;
c. a swivel-loop attachment including a loop portion extending above the top side of the frame and a semispherical solid dome portion fitting within a semispherical dome cavity portion of the top side of the frame; and
d. a locking guard operably attached to the frame, operating from a locked position to an unlocked position, having a spring for biasing the guard in the unlocked position and having a lever for locking the guard in the locked position where a turn of the lever in a first direction will unlock the guard and another turn of the lever in an opposite direction in combination with pressure applied against the spring will lock the guard.
2. The aerial sheave of claim 1 wherein the latch side may be located on either a left or a right side of the frame.
3. The aerial sheave device of claim 2 wherein the latch is attached to the frame via a hinge connection such that in the open position the latch swings out and away from the top side of the frame about the hinge towards a lower end of the pulley wheel.
4. The aerial sheave device of claim 2 wherein the latch is attached to the frame via a pivot pin connection such that in the open position the latch rotates parallel to the frame and towards a lower end of the pulley wheel.
5. The aerial sheave device of claim 1 wherein the pulley wheel has a substantially U shaped profile and the locking guard has an inverted substantially U shaped profile that meshes with the U shaped profile of the pulley wheel to form a closed cable passageway having a substantially 0 shaped profile when in the locking guard is in the locked position.
6. The aerial sheave device of claim 5 wherein the substantially U shaped profile of the pulley wheel includes outward flange and the inverted substantially U shaped profile of the locking guard has an inward flange, the respective flanges supporting the meshing of the pulley wheel and the locking guard.
7. The aerial sheave device of claim 1 wherein the lever of the locking guard is actuated by a 90 degree turn.
8. The aerial sheave device of claim 1 wherein the lever of the locking guard is actuated by a 270 degree turn or by a series of 360 degree turns.
9. The aerial sheave device of claim 1 wherein the loop portion of the swivel-loop attachment is attachable to a fixed pole and the frame is rotatable 360 degrees about the semispherical solid dome portion.
10. The aerial sheave device of claim 1 wherein the pulley wheel and the locking guard are made of non-conductive material and wherein the frame is made of nylon further includes an internal, non-exposed channel made of steel.
11. The aerial sheave of claim 10 wherein the internal, non-exposed channel made of steel has a U-shaped profile.
12. An aerial sheave device for the installation and suspension of cable comprising”
a. a pulley wheel, having a substantially U shaped channel and an outward flange, rotating around an axle attached to a frame having a rigid side, a top side, and a latch side;
b. a latch attached to the latch side of the frame for affording access to the wheel of the sheave, operating from an open to a closed position, having a spring loaded plunger biased in the closed position for securing the latch to the frame in the closed position;
c. a swivel-loop attachment including a loop portion, attachable to a fixed pole, extending above the top side of the frame and a semispherical solid dome portion fitting within a semispherical dome cavity portion of the top side of the frame; and
d. a locking guard, operably attached to the frame, operating from a locked position to an unlocked position, having a substantially inverted U shaped channel and an inward flange which meshes with the substantially U shaped channel and the outward flange of the pulley wheel, having a spring for biasing the guard in the unlocked position, and also having a lever for locking the guard in the locked position where a turn of the lever in a first direction will unlock the guard and another turn of the lever in an opposite direction in combination with pressure applied against the spring will lock the guard.
13. The aerial sheave of claim 12 wherein the latch side may be located on either a left or a right side of the frame.
14. The aerial sheave device of claim 13 wherein the latch is attached to the frame via a hinge connection such that in the open position the latch swings out and away from the top side of the frame about the hinge towards a lower end of the pulley wheel.
15. The aerial sheave device of claim 13 wherein the latch is attached to the frame via a pivot pin connection such that in the open position the latch rotates parallel to the frame and towards a lower end of the pulley wheel.
16. The aerial sheave device of claim 15 wherein the latch further comprises a stop tab which secures the latch to the frame in the closed position and also prevents the latch from swinging about the pin beyond 130 degrees in either direction when in the operating position.
17. The aerial sheave device of claim 16 wherein the lever of the locking guard is actuated by a 90 degree turn.
18. The aerial sheave device of claim 16 wherein the lever of the locking guard is actuated by a 270 degree turn.
19. The aerial sheave device of claim 16 wherein the loop portion of the swivel-loop attachment is attachable to a fixed pole and the semispherical solid dome portion for is rotatable 360 degrees.
20. The aerial sheave device of claim 19 wherein the pulley wheel and the locking guard are made of nylon and wherein the frame is made of nylon further includes an internal, non-exposed U-shaped channel made of steel.