Foldable stepladder with step lock
View Patent ↗A stepladder includes a longer inclined frame provided with steps coupled to a shorter stabilizer frame provided with rungs for movement relative to the longer inclined frame between an expanded use position and a collapsed storage position. The stepladder also includes a top-step lock to lock the top step in a fixed position relative to the two frames.
1. A stepladder comprising
an inclined frame including a left leg, a right leg, a utility platform extending between the left and right legs, and a top step configured to hold the weight of a human and extending between the left and right legs below the utility platform,
a stabilizer frame including first and second vertical members coupled to the inclined frame for pivotable movement about a frame pivot axis, and
a top-step lock including an extension rod extending upwardly along the stabilizer frame to the top step, a rod locker configured to lock the extension rod to the stabilizer frame to lock the top step in a fixed position relative to the inclined frame and the stabilizer frame, and a horizontal anchor rung extending between and directly connected to the first and second vertical members, and
wherein the rod locker includes a pivotable latch that can directly connect and disconnect from the horizontal anchor rung and is formed to include a grip and first and second latch hooks, the grip arranged to extend between the first latch hook and the second latch hook, and a latch mount block coupled to the extension rod and configured to mount the pivotable latch.
2. The stepladder of claim 1 , wherein the pivotable latch is mounted to the latch mount block for pivotable movement about a horizontal pivot axis and positioned to lie between the extension rod and the stabilizer frame.
3. The stepladder of claim 1 , wherein the rod locker further includes a spring arranged within the latch mount block to urge the pivotable latch to pivot about a pivot axis relative to the latch mount block to cause the first and second latch hooks to mate with the horizontal anchor rung.
4. The stepladder of claim 1 , wherein the rod locker is arranged to engage the horizontal anchor rung to lock the extension rod in a fixed position relative to the horizontal anchor rung.
5. A stepladder comprising a frame including an inclined frame member having a left leg, a right leg, a utility platform arranged to extend between the left and right legs, and a top step configured to hold the weight of a human and arranged to extend between the left and right legs below the utility platform,
an actuator positioned to lie below the top step, and
means for coupling the actuator to the top step so that, when the actuator is moved to a first position, the top step is locked in an expanded use position blocking pivotable movement relative to the frame, and so that, when the actuator is moved to a second position, the top step is unlocked to allow pivotable movement of the top step relative to the frame,
wherein the coupling means includes an extension rod having one end coupled to the top step and a second end coupled to a rod locker,
further comprising a stabilizer frame member coupled to the inclined frame member for pivotable movement about a frame pivot axis, the stabilizer frame includes first and second vertical members, a horizontal anchor rung arranged to extend between the first and second vertical members, and a rod guider coupled to the horizontal anchor rung to receive at least a portion of the extension rod, and
wherein the rod locker includes a pivotable latch that can directly connect and disconnect from the horizontal anchor rung and is formed to include a grip and first and second latch hooks, the grip arranged to extend between the first latch hook and the second latch hook, and a latch mount block coupled to the extension rod and configured to mount the pivotable latch.
6. The stepladder of claim 5 , wherein the top step includes an extension rod mount arranged to depend from a bottom surface of the top step and coupled to the extension rod to establish a pivot axis thereabout.
7. The stepladder of claim 5 , wherein the extension rod is positioned to extend upwardly from the horizontal anchor rung along the stabilizer frame member.
8. The stepladder of claim 5 , wherein the top step includes an upwardly facing step platform, a lip arranged to depend from and to surround the upwardly facing step platform, and a top step pivot guide configured to extend between the lip and the stabilizer frame.
9. The stepladder of claim 5 , wherein the utility platform further includes a platform support link coupled to the top step and positioned to extend therebetween to urge the utility platform to pivot about a utility platform pivot axis in response to pivoting movement of the top step.
10. A stepladder comprising
a frame including an inclined frame member having a left leg, a right leg, a utility platform arranged to extend between the left and right legs, and a top step configured to hold the weight of a human and arranged to extend between the left and right legs below the utility platform, and a stabilizer frame member coupled to the inclined frame member for pivotable movement about a frame pivot axis, the stabilizer frame member having first and second vertical members and a horizontal anchor rung arranged to extend between the first and second vertical members,
an actuator positioned to lie below the top step, and
an extension rod arranged to extend upwardly along the stabilizer frame member, the extension rod is coupled on one end to the top step and is coupled on an opposite end to a rod locker,
wherein the rod locker includes a rod guider directly coupled to the horizontal anchor rung and configured to receive at least a portion of the extension rod, and
wherein the rod locker includes a pivotable latch that can directly connect and disconnect from the horizontal anchor rung and is formed to include a grip and first and second latch hooks, the grip arranged to extend between the first latch hook and the second latch hook, and a latch mount block coupled to the extension rod and configured to mount the pivotable latch.
11. The stepladder of claim 10 , wherein the top step includes an extension rod mount arranged to depend from a bottom surface of the top step and coupled to the extension rod to establish a pivot axis thereabout.
12. The stepladder of claim 10 , wherein the pivotable latch, the latch mount block, and the rod guider cooperate to provide the rod locker, the rod locker being arranged to engage the horizontal anchor rung to lock the extension rod in a fixed position relative to the horizontal anchor rung.
13. The stepladder of claim 10 , wherein the pivotable latch is arranged to engage the horizontal anchor rung to lock the extension rod in a fixed position relative to the horizontal anchor rung.
14. The stepladder of claim 10 , wherein the utility platform includes a platform support link pivotably coupled to the top step and positioned to extend therebetween to urge the utility platform to pivot about a utility platform pivot axis in response to pivoting movement of the top step.