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Step 3Making The Bellows
The Pandemic Ventilator Project
The bellows unit has a hinged section of quarter inch plywood that is 10 1/2 inches by 12 1/2 inches.
There is a one and a 1 1/2 and a 1/2 inch by 9 inch sensor pole attached beside the bellows that is used to position the magnetic switches. These are magnetically activated reed switches that are usually used for security systems. The sensor pole should be angled at the bottom so that the top leans back about 1 1/2 inches from the bottom.
The bellows hinge is constructed of 4 pieces of 1 1/2 by 7 inch 5/8 inch plywood pieces and a 1 1/2 by 1 1/2 inch by 17 inch piece of wood, two 3 inch hinges and a 2 inch by 12 1/2 reinforcement.
The bellows is made by screwing down the bottom 2 plywood pieces to the backing board.
Arrange the other 2 plywood pieces directly over the first two, cover with the 17 inch piece of wood and and clamp together.
Drill holes centered 2 and 3/4 inches from each end to accept 1/4 inch carriage bolts inserted from the bottom.
Un-clamp and remove the top 17 inch piece of wood.
Insert carriage bolts from the bottom to line up the middle layer plywood pieces and clamp again.
Screw hinges to middle layer plywood. Ensure the screws do not protrude through the plywood to the bottom layer.
Screw the other side of the hinges to the bellows lid between the lid and the reinforcing strip.
The bag is clamped between the two plywood sections during operation using the nuts and washers on the carriage bolts.
The magnet is attached to the end of the bellows near the sensor pole, and the sensors are attached to the sensor pole. I just used duct tape to attach them so that they can be easily adjusted during the testing phase.
The bellows unit has a hinged section of quarter inch plywood that is 10 1/2 inches by 12 1/2 inches.
There is a one and a 1 1/2 and a 1/2 inch by 9 inch sensor pole attached beside the bellows that is used to position the magnetic switches. These are magnetically activated reed switches that are usually used for security systems. The sensor pole should be angled at the bottom so that the top leans back about 1 1/2 inches from the bottom.
The bellows hinge is constructed of 4 pieces of 1 1/2 by 7 inch 5/8 inch plywood pieces and a 1 1/2 by 1 1/2 inch by 17 inch piece of wood, two 3 inch hinges and a 2 inch by 12 1/2 reinforcement.
The bellows is made by screwing down the bottom 2 plywood pieces to the backing board.
Arrange the other 2 plywood pieces directly over the first two, cover with the 17 inch piece of wood and and clamp together.
Drill holes centered 2 and 3/4 inches from each end to accept 1/4 inch carriage bolts inserted from the bottom.
Un-clamp and remove the top 17 inch piece of wood.
Insert carriage bolts from the bottom to line up the middle layer plywood pieces and clamp again.
Screw hinges to middle layer plywood. Ensure the screws do not protrude through the plywood to the bottom layer.
Screw the other side of the hinges to the bellows lid between the lid and the reinforcing strip.
The bag is clamped between the two plywood sections during operation using the nuts and washers on the carriage bolts.
The magnet is attached to the end of the bellows near the sensor pole, and the sensors are attached to the sensor pole. I just used duct tape to attach them so that they can be easily adjusted during the testing phase.
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