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My kid's best friend

Days

Commentator
design phase is over...
I sent out a letter summarizing what I came up with......



August 10, 2019

Dear Harold, Mike, and Al,
Well, that was fun. Didn’t know I was going to go on a 15-month marathon designing and redesigning the hoist and davit. I was supposed to simply mail the design…

I still need to do that. Hopefully you still open my letters. There is a finished design to be dug out of that stack of letters and notes sitting behind me, I need to do that and assemble it into one complete parts list. I think I’ve explained how those parts are assembled and how the machines work. I added some notes after my last letter, so I’ll include that page with this letter.

So, what is this monster of an idea? Both the hoist and the davit truck are HUGE. Maybe too huge and too heavy to lift to a rooftop? And the davit truck weighs 10 tons… I’m not sure conventional skyscrapers can handle that much additional weight. The vertical truss design that was created for the original twin towers can handle that much weight… but there are not very many skyscrapers in that class. The hoist and davit are still a futuristic design; but that future is happening, there is probably a dozen skyscrapers being built today that utilize the vertical truss design.

I thought it was an interesting design, I thought you 3 would enjoy looking at the concept, and now at the end of all that redesign, the hoist boils down to a battery driven 9/16” wire rope drum hoist. Real fast, real powerful, wireless, onboard power, real safe, with a reach of 2900 feet. It’s a totally DC (direct current) electrical circuit, utilizing a laser/solar panel/Lithium polymer battery and DC power controls to run DC motor generators that drive air cooled, inline planetary gears. The design solves the age-old question of how to spread and guide a wire rope onto a scaffold drum by employing a two-tiered fairlead, precision spreader and a geared wire rope guide that is turned mechanically by the drum. Everything in the hoist design is new, from the open operating area that receives any size pick, to the powerful rollers positioned below the working area, to the fairlead and spreader being located behind the working area, to the stability of the platform, everything is new and improved, to ride in this hoist would feel like nothing ever experienced; powerful, fast, smooth acceleration, and quiet too. You can walk around the stage and it doesn’t move at all, and it is so powerful, it doubles as an outside elevator for material.

Well, another season is upon Harold, and I still haven’t finished mailing the idea. I am just pathetic. I’m going to go quiet for another 4 months, same as last year, but pray for me because I am going to try and finish this project. The design phase is over, so all I have to do is assemble the parts list and finish the drawings… but that still is a lot of work, and the drawings are hard for me, I can’t see what I’m doing, my eyes are too old and the glasses I do own are for seeing far away, I draw with naked eyes… the lines on the paper in front of me are fuzzy, I try to put them in the right place, but it is hard. If I had to build this hoist, it would be easier doing that, because then I could work with an engineer who knows auto-CAD, and I wouldn’t have to draw any more.


My hope is to get something in Harold’s hands that he could show to people after this season is over. I am afraid the drawings will be more along the same line as what I have mailed so far: hand drawn ideas, it is the best I can do.

For the record, I don’t expect this to go any further than mailing the idea to you 3. Any thing is possible if God makes it happens, but I’m not expecting it to happen in my lifetime. If I can package the idea into something cohesive, then someone could end up building it once the world has an actual market for it. Like Harold said, this would be a hoist for China if we tried to market it today… not very practical. When I first thought of the hoist, it needed technology that wasn’t available 30 years ago. Technology has advanced to the point where I can build the hoist today, but it might be another 30 years before there are enough vertical truss skyscrapers built to form an actual market for the hoist. So, it is an idea for posterity. Unless conventional skyscrapers can handle the ten-ton davit truck, which I rather doubt.
````````````````````````` Love, Day

 
Last edited:

Winston

Do you feel lucky, Punk
design phase is over...
I sent out a letter summarizing what I came up with......



August 10, 2019

Dear Harold, Mike, and Al,
Well, that was fun. Didn’t know I was going to go on a 15-month marathon designing and redesigning the hoist and davit. I was supposed to simply mail the design…


I still need to do that. Hopefully you still open my letters. There is a finished design to be dug out of that stack of letters and notes sitting behind me, I need to do that and assemble it into one complete parts list. I think I’ve explained how those parts are assembled and how the machines work. I added some notes after my last letter, so I’ll include that page with this letter.

So, what is this monster of an idea? Both the hoist and the davit truck are HUGE. Maybe too huge and too heavy to lift to a rooftop? And the davit truck weighs 10 tons… I’m not sure conventional skyscrapers can handle that much additional weight. The vertical truss design that was created for the original twin towers can handle that much weight… but there are not very many skyscrapers in that class. The hoist and davit are still a futuristic design; but that future is happening, there is probably a dozen skyscrapers being built today that utilize the vertical truss design.

I thought it was an interesting design, I thought you 3 would enjoy looking at the concept, and now at the end of all that redesign, the hoist boils down to a battery driven 9/16” wire rope drum hoist. Real fast, real powerful, wireless, onboard power, real safe, with a reach of 2900 feet. It’s a totally DC (direct current) electrical circuit, utilizing a laser/solar panel/Lithium polymer battery and DC power controls to run DC motor generators that drive air cooled, inline planetary gears. The design solves the age-old question of how to spread and guide a wire rope onto a scaffold drum by employing a two-tiered fairlead, precision spreader and a geared wire rope guide that is turned mechanically by the drum. Everything in the hoist design is new, from the open operating area that receives any size pick, to the powerful rollers positioned below the working area, to the fairlead and spreader being located behind the working area, to the stability of the platform, everything is new and improved, to ride in this hoist would feel like nothing ever experienced; powerful, fast, smooth acceleration, and quiet too. You can walk around the stage and it doesn’t move at all, and it is so powerful, it doubles as an outside elevator for material.

Well, another season is upon Harold, and I still haven’t finished mailing the idea. I am just pathetic. I’m going to go quiet for another 4 months, same as last year, but pray for me because I am going to try and finish this project. The design phase is over, so all I have to do is assemble the parts list and finish the drawings… but that still is a lot of work, and the drawings are hard for me, I can’t see what I’m doing, my eyes are too old and the glasses I do own are for seeing far away, I draw with naked eyes… the lines on the paper in front of me are fuzzy, I try to put them in the right place, but it is hard. If I had to build this hoist, it would be easier doing that, because then I could work with an engineer who knows auto-CAD, and I wouldn’t have to draw any more.


My hope is to get something in Harold’s hands that he could show to people after this season is over. I am afraid the drawings will be more along the same line as what I have mailed so far: hand drawn ideas, it is the best I can do.

For the record, I don’t expect this to go any further than mailing the idea to you 3. Any thing is possible if God makes it happens, but I’m not expecting it to happen in my lifetime. If I can package the idea into something cohesive, then someone could end up building it once the world has an actual market for it. Like Harold said, this would be a hoist for China if we tried to market it today… not very practical. When I first thought of the hoist, it needed technology that wasn’t available 30 years ago. Technology has advanced to the point where I can build the hoist today, but it might be another 30 years before there are enough vertical truss skyscrapers built to form an actual market for the hoist. So, it is an idea for posterity. Unless conventional skyscrapers can handle the ten-ton davit truck, which I rather doubt.
````````````````````````` Love, Day
Focus on the blue dot

 

Days

Commentator
so the hoist ends up being a 14 mm wire rope drum hoist. Here's the description...


The Hoist and Davit


This is the first scaffold hoist specifically designed for super tall buildings. Conventional scaffold hoists are not suited to the performance demands of the 1200 foot + environment, if our industry is going to gain access to the exterior of super tall buildings, we must enter a whole new paradigm of hoist performance. This hoist is a battery driven gearmotor hoist that employs two 60 Volt DC motor/ generators working in tandem behind air cooled planetary gearing. It is a much larger scaffold hoist than the world has ever seen, the hoist is 8 ½ feet tall, 5 feet wide, and 4 feet deep, constructed entirely from titanium. The hoist employs a 15 ¼” diameter drum and weighs roughly 3000 pounds. Below and in front of the stage, located on the upper and lower levels of frame, there are two 7” diameter x 40” rollers. The frame suspends a wire rope drum tube between two motor housing tubes, sending power through two gearings that meet in the center of the drum tube. The gearing provides a 3600:1 torque reduction for both motors, making the hoist extremely powerful. 1200 RPM motors engage inline gearing that provide 100% throughput to the drum. The 150:1 gear ratio turns the drum at 8 RPM … resulting in a base wrap that climbs 32 feet per minute. The hoist receives 14mm wire rope. The highest reach of the hoist is 885 meters / 2900 feet.

There is no AC on this hoist. A total of 4 cubic feet of lithium polymer batteries provide a large reservoir of power for a system that is constantly receiving and using a small flow of voltage. Two battery packs are recharged by a 12” x 16” solar panel located on the roof of the hoist. A laser is fastened on the end of the davit boom and aimed directly down at the solar panel. Since the batteries are onboard, there is no way to lose power, but if the laser fails, there should be sufficient charge in the batteries to climb to the roof. The laser runs on the building’s power feed to the roof, the laser converts that power source to light, which the solar panel then converts back to electricity; hence, the hoist batteries are recharged in use, and the DC power controls maintain the battery charge level at 95%. The idea is to take advantage of lithium polymer batteries being very good at discharge and recharge. In essence, the laser does the job of an electric cord… it feeds power to the stage, only it does it wireless.

There are no load-free lines such as an electric cord or nylon/polyurethane rope, the wire rope load line is the sole line on each end of the stage. Guard rail is structural; the operator can tie off to the back rail, while the pick is secured to the front guard rail. The hoist is balancing a front side and a back side, by positioning a heavy ballast in the bottom middle. The front two-foot work area is completely unobstructed, while the back side of the hoist has the fairlead, spreader, drum guide, batteries, power controls, and solar panel. The load line enters the fairlead 7” behind the stage. The load line is captured by tension rollers in the upper fairlead, which then feed a swivel sheave in the lower fairlead, the fairlead swivel sheave turns freely as does the spreader trolley it feeds, both are controlled by the drum guide trolley they feed, and the drum guide trolley is geared to the drum. The spreader is a precision spreader, there is absolutely zero pull to any point on the drum by the wire rope being under load. There are no electrical controls to the wire rope guide… it is solely an interaction of mechanical gears… impossible to fail. When the drum reverses direction, so does the guide; if the drum wrap hits the rim and heads back the other direction, so does the guide… the drum turns everything, the gears only turn if the drum turns. With over 6 vertical feet from the tension rollers in the upper fairlead to the capture of the wire rope on the drum, this hoist takes platform stability to a whole new level, the hoist is also balanced from left to right and front to back.

Down direction is power off, pushing the pendant down button only releases the brakes… the hoist then free falls, gravity runs the down direction. The DC motor/generator recharges the battery in down direction, while the gearing and the generator constantly limit the drum rotation to 8 RPM. The drum will stop turning the moment the hoist sets down, and the wire rope remains taut with the tension rollers in the upper fairlead at all times. The drum is braked on each end by 2 giant friction brakes which take the entire load directly, each brake has 200 square inches braking area. The projected maximum working load for the stage is roughly 2 tons; a 6-ton stage would require 15 pounds per square inch to stop. The brake is spring loaded, making the brake always on, the springs are accompanied by solenoids that hold off the brake when moving.

I designed a davit roof truck that can suspend this hoist over the side and clear any size wall. The davit is really an electric crane. The davit truck supports a mast of 3 stages that fit inside each other, and a boom that swivels on top. The rear wheel drive davit truck is 5 feet x 10 feet, with the 3-ton boom counter weight, the davit truck weighs 10 - 13 tons, depending on whether the stage is suspended. A traction hoist and 2 pulleys, rigged to the boom counter weight, lift the mast into place, and then lift the boom counter weight, suspended from two pulleys on the back of the boom. The davit truck is also counterweight for the boom; when a drop site is chosen, the davit is jacked in the four corners, the hoist and boom counterweight are lifted (simultaneously), then the boom swivels on the mast and the stage is swung over the wall. Then the boom ties back to the roof truck, there’s no need to tie down the davit truck to the building. Two men should be able to set up the mast, collapse the mast, and handle moves between drops. The davit trucks can be driven between drop sites with the stage outboard. A pavement needs to be provided for the davit truck.

It is temporary equipment; the hoists can swap out any length pick, 12 feet or longer. It is nearly zero maintenance, rugged equipment that should last forever. It is high performance equipment, the stage is extremely stable, fast, and the wire rope guide wraps so accurate, the wire rope should last many years between changes. It is a powerful hoist, with a heavy duty super structure, that can handle heavy use as well as heavy projects. And it is wireless technology, onboard power, that puts full control of movement in the hands of the operator… which makes this is a very safe hoist that will never get stuck in the air for any reason.
 
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