Patent Application
20210222493
The present invention relates to hollow rung extension ladders, ropes and pulleys.
The Fixed pulley is used for changing the direction of the input force. Fixed pulleys are used for flagpoles or with a hoisting device and is therefore is usually attached to a stationary object above the load. When the rope is pulled downward, the effect is that the load is lifted upwards. This type of pulley will not reduce the effort needed to lift the load, but applies the force of gravity and your weight in your favor. The mechanical advantage is 1 to 1. Therefore, to lift the load a foot, one needs to pull a foot of rope downward.
The movable pulley is used to reduce the amount of input force to lift a load. The most popular system that uses this pulley would be a well. Unlike the fixed pulley, the movable pulley is attached to the load and is lifted by pulling up on the rope, making it twice as easier to lift a heavy object. In this case, a 20 pound load could be lifted with just 10 pounds of input force. The tradeoff is that one has to pull twice the amount of rope, and gravity is not in one's favor by pulling off.
The block and tackle uses one fixed and one movable pulley to reduce the amount of force needed to lift an object. However, many pulleys are incorporated into the block and tackle system. The trade off is that one has to pull however many times more rope to lift the object. The mechanical advantage decides how much rope would be needed to pull the object a certain distance and how much force is needed to move the object.
The disclosed hollow rung step ladder pulley hoist and tool retainer system includes a tubular insert having a first end configured to be received into an opening defined by a hollow rung in a side of an extension ladder and a second end configured with at least one pulley sheave wheel, a length of the tubular insert being less than or greater than a width of the rungs of the ladder. The system also includes a pulley cord of a length configured to run once around the at least one pulley sheave wheel and bear a load between a tension portion and a load portion. The system additionally includes a tool retainer configured to attach to the first end of the at least one tubular insert either proximal a received side of the ladder or proximal an opposite side of the ladder for a tubular insert length greater than a width of the rungs of the ladder. The system yet includes a holder configured to be received between the opening defined by a hollow rung in a side of an extension ladder and the tubular insert, the holder adapted to receive a tubular insert from both a left side and a right side of the ladder.
A method of hoisting something via the disclosure includes inserting a rod having a first end configured to be received into an opening defined by a hollow rung in a side of an extension ladder and a second end configured with at least one pulley sheave wheel, a length of the rod being less than or greater than a width of the rungs of the ladder. The method also includes running a pulley cord of a length configured to run once around the at least one pulley sheave wheel and bear a load between a pull portion and a load portion. The method further includes attaching a tool retainer to the first end of the rod either proximal a received side of the ladder or proximal an opposite side of the ladder for a rod length greater than a width of the rungs of the ladder
Other aspects and advantages of embodiments of the disclosure will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrated by way of example of the principles of the disclosure.
Throughout the description, same and similar reference numbers may be used to identify same and similar elements depicted in multiple embodiments. Although specific embodiments of the invention have been described and illustrated, the invention is not to be limited to the specific forms or arrangements of parts so described and illustrated. The scope of the invention is to be defined by the claims appended hereto and their equivalents.
Reference will now be made to exemplary embodiments illustrated in the drawings and specific language will be used herein to describe the same. It will nevertheless be understood that no limitation of the scope of the disclosure is thereby intended. Alterations and further modifications of the inventive features illustrated herein and additional applications of the principles of the inventions as illustrated herein, which would occur to one skilled in the relevant art and having possession of this disclosure, are to be considered within the scope of the invention.
Throughout the present disclosure, the term ‘tubular insert,’ refers to a rod, bar, shaft, stick pole, strut, dowel, spoke, spike and cylindrical extension. The term ‘extension ladder,’ refers to a ladder having sides defining openings for hollow rungs and therefore may include ladders not limited to sliding extensions but also to fixed triangular ladders and non-conventional transforming ladders adapted with side openings for hollow rungs.
The ladder elevator is a pulley system. It attaches to a universal holder that goes in between the holes that are pre-made from factory on every extended ladder. This is done because all the steps of the ladder are hollow. I created what I call a holder that has a receiver where the pulley system attaches. There are two holders and two pulleys, one goes in the extended top part of the ladder and one goes on the base or bottom part of the ladder on the same side. Creating a rail or elevator this tool contains a bag where items can be stored. As you pull the rope the part can go up and down and will lock in position with a brake or ratchet on the pulleys. The elevator will extend as the ladder extends. Since the holder goes across the steps of the ladder, we can use various attachments for different purposes. For example, a rack for tools such as a hammer or drill, a small bucket or tray for nails and/or smaller hardware. The holder will have universal clips for the different attachments and can be used on either side (right or left). The elevator and attachments work in unison to make work in any field that involves extended ladders, safer and more efficient.
Although the operations of the method(s) herein are shown and described in a particular order, the order of the operations of each method may be altered so that certain operations may be performed in an inverse order or so that certain operations may be performed, at least in part, concurrently with other operations. In another embodiment, instructions or sub-operations of distinct operations may be implemented in an intermittent and/or alternating manner.
While the forgoing examples are illustrative of the principles of the present disclosure in one or more particular applications, it will be apparent to those of ordinary skill in the art that numerous modifications in form, usage and details of implementation can be made without the exercise of inventive faculty, and without departing from the principles and concepts of the invention. Accordingly, it is not intended that the disclosure be limited, except as by the specification and claims set forth herein.
