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Semi free rotating pin wheel actuator to spring load and fast release a piston plunger in a pump

IP.com Disclosure Number: IPCOM000249273D
Publication Date: 2017-Feb-15
Document File: 4 page(s) / 471K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention describes a drive train mechanism that consists of a rotating wheel with a pin that can pull back a spring loaded plunger and subsequently release it freely. In case something prevents the piston to move forward, this drive train will ensure that the plunger is always picked up to pull it back to its starting position.

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This is the abbreviated version, containing approximately 54% of the total text.

Date: February 13, 2017

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Title of the invention: Semi free rotating pin wheel actuator to spring load and fast release a piston plunger in a pump.

Abstract of the invention:

This invention describes a drive train mechanism that consists of a rotating wheel with a pin that can pull back a spring loaded plunger and subsequently release it freely. In case something prevents the piston to move forward, this drive train will ensure that the plunger is always picked up to pull it back to its starting position.

Description of the invention

Background of the invention For devices that propel a mixture of air and water, the air is typically compressed in a cylinder by a

piston that it moved forward by a compressed spring. A motor drives a pinion gear that has a

limited number of teeth along part of its circumferential area and interacts with a rack gear that is

part of the piston. The rotation of the pinion gear, forces the rack gear back which results in

compression of the spring. Once the pinion has rotated so far that no gear teeth are interacting with

the rack gear anymore, the piston is forced forward by the spring. See figure 1.

Figure 1 : Operation of the drive train

However, if the piston moves too slowly forward after release, the subsequent renewed interaction

of the first tooth of the pinion gear with the rack gear can be different from the first tooth on the

rack gear. See figure 2. Practice has shown that applying three subsequent propulsions of mixed

liquid and air in 1 second, can result in collisions between the teeth of the pinion gear with a tooth

on the rack gear.

Date: February 13, 2017

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Figure 2: Locking mechanism events detailed.

Problems or disadvantages overcome by the invention The present invention prevents locking of the drive train mechanism as described above. This

locking occurs when teeth of pinion gear and rack gear are not interacting in the right way i.e.

collide on top of each other. This happens when the resistance experienced by the spring becomes

too high, which can be due to, for example, higher pressure buildup inside the cylinder due to a

blocked propulsion nozzle or increased friction of the piston inside the cylinder. The present invention...