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An elevator system for a basketball backboard comprising, in combination, a parallelogram frame and a backboard connected to the frame. A ratchet and pawl arrangement is connected between one of the arms and one of the vertical surfaces of the parallelogram frame so that a first vertical surface is

An elevator system for a basketball backboard comprising, in combination, a parallelogram frame and a backboard connected to the frame. A ratchet and pawl arrangement is connected between one of the arms and one of the vertical surfaces of the parallelogram frame so that a first vertical surface is freely movable upward relative to a second vertical surface and is held in a selected vertical position when the vertical lifting force applied to the first vertical surface is removed. The ratchet includes a plurality of ratchet teeth connected to and movable with one arm relative to the first vertical surface. The pawl is pivotally connected to the first vertical surface and disposed for engagement with the ratchet teeth to hold the first vertical panel in a selected vertical position when the vertical lifting force is removed. Also provided is a structure for biasing the pawl toward selective engagement with the ratchet teeth, the engagement depending upon the vertical position of the first vertical surface relative to the second vertical surface. A bell crank lever is pivotally connected to the first vertical surface and operatively associated with the ratchet and pawl arrangement, with a structure for connecting the bell crank lever to the pawl that is responsive to pivotal movement of the bell crank to move the pawl out of engagement with the ratchet teeth.

대표청구항 ▼

An elevator system for a basketball backboard comprising, in combination, a parallelogram frame and a backboard connected to said frame, said parallelogram frame including, first and second vertical, relatively parallel surfaces, upper and lower arms disposed in parallel relation one above the other

An elevator system for a basketball backboard comprising, in combination, a parallelogram frame and a backboard connected to said frame, said parallelogram frame including, first and second vertical, relatively parallel surfaces, upper and lower arms disposed in parallel relation one above the other and extending between said first and second surfaces, and means for pivotally connecting said arms to both of said vertical surfaces so that said first vertical surface is supported on said arms for vertical movement relative to said second vertical surface while maintaining said parallel relation between said first and second surfaces, a ratchet and pawl arrangement connected between one of said arms and one of said vertical surfaces so that said first vertical surface is freely movable upward relative to said second vertical surface in response to a vertical lifting force applied to said first vertical surface and is held in a selected vertical position when the vertical lifting force applied to said first vertical surface is removed, said ratchet including a plurality of ratchet teeth connected to and movable with said one arm relative to said first vertical surface, said pawl being pivotally connected to said first vertical surface and disposed for engagement with said ratchet teeth to hold said first vertical surface in a selected vertical position when said vertical lifting force is removed, means biasing said pawl toward selective engagement with said ratchet teeth depending upon the vertical position of said first vertical surface relative to said second vertical surface, a bell crank lever pivotally connected to said first vertical surface and operatively associated with said ratchet and pawl arrangement, means for connecting said bell crank lever to said pawl, pivotal movement of said bell crank operative to move said pawl out of engagement with said ratchet teeth, and vertical manipulating means simultaneously engageable with said first vertical surface and with said bell crank for pivoting said bell crank lever and said pawl against said bias to positively disengage said pawl from said ratchet to permit lowering of said first vertical surface and also for applying said vertical lifting force to raise said first vertical surface without engaging said bell crank to positively disengage said pawl from said ratchet.