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squirt gun

 
Dictionary: squirt gun
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n.
A toy gun designed to squirt a stream of water. Also called water gun, water pistol.


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How Products are Made: How is a water gun made?
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Background

Pump-action water guns are a relatively recent addition to the water gun arsenal. Plastic squirt guns have long been a staple summer-time toy of American children. These traditional toys eject a relatively weak stream of water, requiring frequent breaks for refilling. The pump-action gun operates on a different principal from its predecessors. The user pumps a handle on the gun, which pressurizes air in a reservoir. When the user then operates a piston-like trigger, the pressurized air ejects water from a separate water tank, resulting in a strong stream of water that can reach as far as 50 ft (15 m). The original pump-action water gun was invented by an American engineer, Lonnie Johnson, and the toys are manufactured under the brand-name Super Soaker by the Larami Corporation of Mount Laurel, New Jersey. Despite the success of the Super Soaker, other companies have taken and expanded on the design.

History

Inventor Lonnie Johnson had a Master's degree in nuclear engineering and was working for the Air Force in 1982 when he came up with the idea of a pressurized squirt gun. He was actually working on a heat pump project that involved the use of water instead of Freon as a refrigeration fluid. While experimenting with some tubing in his bathroom, Johnson shot water through a high-pressure nozzle. He put the refrigeration work aside to make a prototype water gun, which he gave to his six-year-old daughter. The high-powered squirt gun quickly became the hit of the neighborhood, and the inventor began working on a marketable model. Johnson made all the valves and fittings for his water gun himself, and took out several patents to protect his rights. Manufacturing the water gun with his own resources proved to be too expensive, so Johnson marketed his idea to toy companies. It wasn't until 1989 that the inventor met with representatives of the Larami Corporation at that year's American International Toy Fair. Larami had previously marketed a battery-operated squirt gun that was patterned on the Israeli Uzi submachine gun. The battery-operated gun, invented by Alan Amron, went on the market in 1985 and was a big hit in 1986. This gun was powered by an interior motor which pumped out 250 squirts per minute. Due to Larami's water gun experience, it seemed a good candidate to make Johnson's toy. Johnson was wary of letting out the secret of his water gun's design, and at the toy conference he described his model in vague terms. He disclosed enough to get Larami's executives curious, and soon after, Johnson brought his prototype to the company's headquarters. His hand-built model was made of polyvinyl chloride (PVC) tubing, Plexiglas, and plastic soda bottles. To show the executives what the water gun could do, Johnson filled it and shot an immense stream of water all the way across the board room. Larami's president was immediately impressed, and Johnson and the company signed an agreement. The toy was almost instantly popular. Within two years of its introduction in 1990, Larami had sold over 10 million Super Soakers. With the larger models cost up to $40 dollars, it was a significant moneymaker.

Controversy erupted over the high-powered water guns in the summer of 1992. In Boston, a water fight escalated into a real gunfight, and one teenager was shot to death, causing Boston's mayor to ask local stores to stop stocking Super Soakers. Shortly after, in New York, teenagers drenched a passerby with a Super Soaker, and the offended victim answered with gunfire, wounding two youths. Politicians and law enforcement personnel faulted the Super Soaker in the wake of these tragedies, though others argued that it was real guns and not water guns that were the problem. Nevertheless, pump-action water guns grew in popularity. By 1998, Larami's Super Soaker was the top-selling summer toy in the world. Retail sales stood at over $200 million. The company had sold more than 300 million Super Soakers over eight years, and produced close to 10 models of varying size and price.

Raw Materials

The prime raw material for water guns is simply plastic. The plastic is mixed with various pigments for colorful effects. Other materials needed are glue and light screws. The dies for the plastic molds are made of steel. Water is used in the manufacturing process, to test parts, as is pressurized air.

Design

The manufacturing process for pump-action water guns is fairly simple, but the design process is lengthy and involved. The selling period for water guns is limited to summer. The design process usually begins in July or August, to create new models for next year's selling season. At that point, marketers usually have a clear idea of what models are selling well for the current year, and they can incorporate sales data and retailers' feedback into their plans for the next summer. Personnel at the water gun company begin their designs with a wish list, noting what features they would like to see improved or changed, and coming up with creative notions for the product. The company might also employ consultants or designers outside the corporation, to make sure it has access to fresh points of view. When the ideas have been hashed out for about six months, the water gun company enlists engineers to make a preliminary model. This first model is known as a "bread box." The bread box has the working features the water gun company has requested, but the nozzle and pump are fitted into a box looking little like the finished product. The features are evaluated for their performance only at this point; how the gun looks is another question entirely. The bread box may undergo alterations several times. Once it is approved by the company personnel working on the project, the engineers make drawings of the internal layout of the required parts.

Next, designers begin their work, making drawings of how they think the water gun should appear. The designers may make half a dozen to a dozen drawings. The company team reviews the drawings, and may mix and match aspects of different designs. For example they may prefer the handle on one design, and the nozzle on another. Designers make a final drawing based on the company team's preferences.

The designers' drawings are then sent to the engineers, who come up with the parts drawings. In most cases, the engineers need to alter aspects of the design. So the drawings go back to the designers for review, alterations are made, and the engineers make more drawings. Eventually a design is finalized and sent to a model maker.

The model maker makes several models. The first one is not a working model but solid plastic. This allows the company team to see what the gun looks like in three dimensions. Then the team can judge the aesthetics of the new gun better. Next, the model maker produces a working model. Meanwhile, the art department at the company comes up with package designs and colors for the gun. The working model is made of a gray plastic. The model maker produces six of these, and the art department artists paint them to make them look like the toy that the company proposes to sell the next summer. These mock-ups are then distributed to top retail buyers. The buyers give their opinions on what they like or don't like about the product. They also begin to give the company estimates of how many their stores might want to stock.

After the water gun company has received feedback from the retailers, it begins working with its manufacturing contractor to get the new product ready for mass production. Yet another model is created, this time called a tooling model. This lets the experts in the factory see the parts they will need to mold, and they can point out any problems. At this stage, further work is done at the manufacturing plant.

The Manufacturing Process

Making the moids

  • Designs for the individual parts of the water gun are drawn on computer. The drawings are then fed to the computer at the manufacturing facility. This computer controls the cutting of the molds. The molds are cut out of steel, following the computerized design.

Testing the molds

  • Before mass production begins, workers at the manufacturing facility make several test runs. In the first test run, enough uncolored plastic is fed into the machines to make just two or three copies of each part. Engineers study these pieces, called test shots, to make sure there are no problems. Then workers run a slightly larger test. This is called the engineering pilot. Again using uncolored plastic, the molds are filled and a few dozen pieces of each part is made. These parts are then fully assembled, to make two or three dozen model guns. This allows the factory personnel to test the whole production process. They can see how well the pieces are formed and how they fit together. Any problems in assembly are addressed at this point. The next test run is the color check. The raw plastic used in the molds is naturally light brown, off-white, or gray. Pigments are added to the plastic, and the molds are filled. The colors are checked to make sure they are what the design specified. Finally, workers make a test run of 40-50 pieces, to be set aside for quality control. These are sent to several different labs and tested for both safety and reliability. If everything tests well, then mass production can begin.

Full production

  • Individual pieces of the water guns are made through injection molding or blow molding. Heated plastic is injected or blown into the steel molds under pressure. Workers unmold the parts and take them to an assembly area. The assembly work is done by hand. Some parts simply snap together, others need to be glued or put together with screws. One aspect that makes water gun manufacturing different from the manufacturing of other molded plastic items is that the parts need to be tested for water-tightness. Every pump and every nozzle that comes out of the molds is tested, as are some other vital parts. If possible, air is blown into the part instead of water. If a part is air-tight, then it will certainly hold water. Some parts must be tested with water, however. This means that afterwards they must be dried, or else the guns would leave the assembly room wet. So air is blown through them to dry them. In some cases, because of the shape of the part, it is not possible to get all the water out. In these instances, the water used is treated with an anti-fungal agent, and the packaging also indicates that some moisture in the gun is to be expected. When running at peak production, the water gun manufacturing plant employs thousands of people and over several months makes millions of guns.

Packaging

  • When the water guns are fully assembled, they are ready for packaging. As the gun itself had a long design process, packaging also has many aspects to be considered for an ideal product. Pump-action water guns are mostly made overseas and shipped long distances. The weight of the packaging is extremely important, since it determines shipping costs. The packaging must also be durable enough to withstand rough handling and attractive enough to grab consumer's attention at the retailer. The overall size of the package is also important. The box may be designed so that several fit together, saving space in the shipping carton. Since the product is packed by hand, the package also needs to be easy to fill, so workers package them quickly.

Quality Control

Quality control starts at the beginning of the design process. As with all toys and products marketed to children in the United States, pump-action water guns must meet safety standards. These standards are set by the American Society for Testing and Materials (ASTM) and concern small parts, sharp points, safety of materials, and other aspects. Manufacturers are also concerned with the reliability of their product. An expensive, top-of-the-line water gun may be designed to last for 10 years, while a less expensive product is generally expected to last a year or two. This reliability is designed into the product, with a testing schedule laid out specifying the number of times the gun is expected to shoot. Just before the main production run, the manufacturer does a test run of 40-50 pieces for quality control purposes. These test pieces are subjected to a variety of trials such as drop tests, to see how well they hold up to both normal use and excessive abuse. If a model is supposed to last through 2,000 squirts, then the testing facility puts it through 2,000 squirts. Other pieces are tested to make sure no dangerous materials have been used in the making of the product, such as lead or heavy metals, and other safety factors are minutely examined. A large amount of quality control is also built into the manufacturing process. Key parts are tested individually before assembly, either with pressurized air or water. Random samples of fully assembled water guns are also taken. These are tested for function, meaning that they are filled with water and shot.

The Future

Pump-action water guns are being continuously redesigned to cater to the public's demand for bigger, larger water toys. There are many new designs that promise to meet this request. One new water gun will hold 1 gal (3.8 L) of water, have six settings for the nozzle, and three different spray patterns. Another will have 11 nozzle settings and hold 1.3 gal (4.8 L). The amount of soakage per second and length of spray are also a large factors in future design.

Where to Learn More

Periodicals

"Alan Amron's Battery-Powered Big-Squirt Water Guns Have Left the Competition All Washed Up." People(September 8, 1986): 89.

Brown, Caryne. "Making Money Making Toys." Black Enterprise (November 1993): 68.

Fitzgerald, Kate. "Toy Makers Set to Soak the Market with Water Guns." Advertising Age (March 22, 1993): 4.

"Hold Your Water." People (June 29, 1992): 89.

Mathews, Jay, with Debra Rosenberg and Nichole Christian. "The Soaking of America." Newsweek (June 22,1992): 58.

Swartz, Mimi. "Child's Play." New Yorker (July 13,1998): 27.

[Article by: Angela Woodward]


WordNet: squirt gun
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Home > Library > Literature & Language > WordNet
Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: plaything consisting of a toy pistol that squirts water
  Synonyms: water pistol, water gun, squirter

Wikipedia: Water gun
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 This article may require cleanup to meet Wikipedia's quality standards. Please improve this article if you can. (August 2009)
"Waterpistol" redirects here. For the Shack album, see Waterpistol (album).
A Super Soaker water gun.
An inexpensive water gun

A water gun (or water pistol, squirt gun, or water blaster) is a type of toy designed to shoot water. Together with water balloons, these devices are the primary tools used to soak another during a water warfare game.

Historically, water guns were made of metal and used rubber squeeze bulbs to load and propel water through the nozzle [1]

Many small water guns work on the same principle as a spray bottle. The body of the toy is essentially a container for water, and the trigger is attached to a pump which squirts water out of a tiny hole at the muzzle or nozzle. However, many modern water guns employ more complex technologies to provide more power and water output than their predecessors.

In the U.S. and Canada, for several years, import regulations and domestic laws have required squirt guns to be made of clear or tinted transparent plastic.[citation needed] This is to make them harder to mistake for actual firearms.

Modern variations of the design include using compressed air, rubber chambers, springs, peristaltic pumps, or hydraulic pressure to propel the water or an electric pump powered by batteries. Some employ a combination of technologies to produce better stream performance. A more common term for larger water guns is water blasters.

Contents

Technology

Many different mechanical designs serve to propel water.

Squeeze Bulbs

Akin to water droppers, the oldest known manufactured water guns utilized a simple rubber squeeze bulb into which water could be drawn, then forcibly expelled out the nozzle by squeezing the bulb rapidly.[1] This design has inherent limitations regarding the amount of pressure that one can achieve (fully dependent on the user's hand gripping strength) as well as the need to refill after each shot.

Trigger Pump / Spray Bottle

Many early small water guns used the same trigger based pumping mechanism as on spray bottles. Basically, the trigger would actuate a positive displacement pump shaft. With the aid of two check valves, often using small ball bearings, fluid could be drawn into the pump from a reservoir, then forced out the nozzle upon squeezing the trigger. The simplicity of the spraying mechanism let these types of water guns be manufactured cheaply, and allowed the majority of the body could be used as the reservoir. The primary limitation with this design is the volume of water that could be effectively moved per pump. Increasing pump volume would require more user effort to push the fluid out, making larger designs impractical. However, this technology remains widely used today both in spray bottles as well as small water guns that can be found in a wide variety of shapes and colors. [2]

Syringe / Piston

Another simple method employed in a number of water guns to push water is a syringe or piston type system. In essence, the water gun is made up primarily (sometimes exclusively) of the pumping mechanism that comprises an outer pump shaft with an inner pump-rod and water-tight seal. This allows water to be drawn into the pump as the pump is extended, then forcibly ejected out as the pump is compressed. Stream performance is dependent on the user's strength. Some models, like the Super Soaker Power Soaker Jr. and Stream Machines draw in and expel water out of their nozzles. This design requires a bucket-type filling source to fill and refill the water gun. Other models, like the Super Soaker Power Soaker Mighty Cannon and Water Warriors Steady Stream, have check valves and a reservoir for true portability. [3]

Motorized Small Piston

During the 1980s, the motorized water gun was perhaps at its most prolific. Companies such as Entertech Inc. and Larami Inc. were creating replica-type water guns modeled after guns popularized in movies such as Rambo.[4] At the heart of these blasters was a small motor and crank shaft that would convert the rotary motion into a forward-backwards pumping motion to drive a small pump akin to those found in the small spray bottle-type squirt pistols. Stream performance was often not particularly better, but the motor taking away the user's need to pump made them more popular although these water guns typically burned through four AA batteries during two water fights. However, their main strength and consequent reason for dismissal was their realistic styling. After some of these realistic-shaped water guns caused accidental shootings by police, stricter rules regarding shapes and coloring of water guns were drafted in the United States.

Air Pressurized Reservoir

This system was made famous by the Super Soaker brand of water guns, but actually was first employed by the Cosmic Liquidator.[1][5] In this case, a pump is used to push air into a partially water-filled reservoir. The reservoir is otherwise air-tight, but has one valve to let the incoming air in from the pump as well as a manually controlled valve operated by the user, commonly activated by pulling on a trigger. As more air is pumped in, the air in the reservoir is compressed, increasing in pressure; the water is also pressurized by the now compressed air. Upon opening of the nozzle valve, the pressurized water is then pushed out through the nozzle as the air attempts to re-equilibrate with atmospheric pressure. This system allows pumping energy to be stored and used as needed. As well, unlike the methods noted above, this air pressure system allows production of a solid, continuous stream of water. [3]

The limitation of this design is the need for a large number of strokes to pressurize a larger reservoir. As well, poorly sealed reservoirs would render a water gun useless. Moreover, these water guns cannot be refilled unless emptied and depressurized. Opening a pressurized reservoir blaster while there is pressure remaining in the system can result in copious local water spray or even an unexpected launch of the water gun and/or reservoir out of one's hands.

Air Separate Pressure / Firing Chamber

The air-based separate pressure chamber or firing chamber system works on the same physical principle as the pressurized reservoir system, but instead of pressurizing the reservoir, a separate, fixed volume chamber is included on the water gun into which water is pumped, compressing the air inside. This technology was first used on the Super Soaker SS 100. What this allows is for the reservoir to be removed/opened at any time for refilling since the reservoir is not pressurized. As well, the typically smaller size of the pressure chamber and the fact that water is typically pumped as opposed to air reduces the average number of pumps needed to achieve functional pressure. For improved performance, some users opt to pre-pressurize the firing chamber by pumping in some air first. This increases the starting pressure within the chamber, thus increases the overall average pressure experienced by the water when it is pumped into the pressure chamber. [3]

Split Air vs Water Pressure Chamber

While air based, the split air vs water pressure chamber has a sliding plunger that separates the compressed air from the water. This technology has so far only been seen on the Water Warriors Aqua Master PreCharger Series.[6] A button is used to toggle whether the pump is priming/pre-pressurizing the pressure chamber with air or whether the pump is moving water into the pressure chamber. Akin to pre-pressurizing the Separate Pressure Chamber water guns, the split air vs water pressure chamber takes this one step further by preventing the accidental, undesired release of the pre-pressurized air by keeping it separated from the water by a sliding piston divider. After all the water is expelled from the pressure chamber, the sliding piston prevents loss of the pressurized air, thus reducing the number of times the water gun must be pumped with water in order to achieve optimal firing pressure.[3]

Constant Pressure System

The Constant Pressure System (CPS) was first introduced by the Super Soaker CPS 2000 in 1996.[7] Instead of relying on pressurized air to push water out the nozzle, CPS uses rubber elastic chambers to power the water gun. There are two common shapes of CPS chambers used: cylindrical and spherical. While the physics behind the system remains the same, there is a slight advantage for the cylindrical shape to push water in a linear direction since, upon expansion, it has more elastic force vectors pointing in the desired direction of flow compared to a spherical pressure chamber. However, because of how they expand, cylindrical pressure chambers also have more stress points than spherical ones. Nevertheless, use of the elastic materials typically offers improved power performance, particularly since pressure does not drop off as quickly as water is expelled from the pressure chamber as is seen in air-pressure-based systems. CPS-based water guns are perhaps some of the most sought after due to their improved performance and lack of firing angle limitations. [3]

Rubber Diaphragm / Hydro Power

"Hydro Power" is a term coined by Buzz Bee Toys Inc., referring initially to their series of water guns that employed an elastic rubber bladder to pressurize water. Akin to the CPS system, the rubber diaphragm system can be considered basically half of a CPS-pressure chamber. A sheet of elastic material (typically rubber) is clamped against a housing unit. Water is pumped into the chamber, expanding the bladder that pressurizes the water within. However, due to the shape of the bladder, its expansion is not as uniform as in the CPS system, thus it experiences more significant pressure dropoff as the pressure chamber empties.[3]

Springs

Another means of pressuzing or propelling water used in some water guns is the use of metal springs. The Waterball series has a spring-based catapult mechanisms for launching balls of water out of its nozzle.[8] The Water Warriors Steady Stream uses a spring-based mechanisms as a sort of water capacitor to allow this otherwise piston-based water gun to produce a constant stream of water so long as the user pumps quickly enough.[9] Additionally, the Super Soaker Quick Blast employs a spring-based firing chamber to propel its stream forward. [10]

Peristaltic Pumps

Peristaltic pump systems have also been used in some water guns models, most notably the original Shield Blaster water guns by Mattel Inc. In this system, a rotary pump is used to move rollers along a compressible piece of tubing. As the rollers move along the tubing, they push water along. The force exerted by the pump is dependent both on the speed of rotation as well as the thickness of tubing used. True continuous streams cannot be produced since the physical presence of the rollers means there will be partial gaps in the flow. However, if pumping is done quickly enough, the end result is a virtually smooth stream. .[3]

Hybrid Systems

There are also a number of water guns that employ a variety of pressurization systems to propel water.

See also

References

  1. ^ a b c "Oldest Known Water Guns". iSoaker.com. http://www.isoaker.com/Info/Misc/factoids_oldest.html. Retrieved 2009-07-20. 
  2. ^ "Digital Water Gun Museum". Sinasnet.nl. 2001-08-15. http://www.sinasnet.nl/Watergun.HTML. Retrieved 2009-07-20. 
  3. ^ a b c d e f g "Soaker Technology Basics". iSoaker.com. http://www.isoaker.com/WaterWar/Players/soaker_tech_basics.html. Retrieved 2009-07-20. 
  4. ^ "Larami Uzi". iSoaker.com. http://www.isoaker.com/Armoury/Analysis/0/larami_uzi.html. Retrieved 2009-07-20. 
  5. ^ "The Cosmic Liquidator". iSoaker.com. http://www.isoaker.com/Armoury/Analysis/1978/cosmicliquidator.html. Retrieved 2009-07-20. 
  6. ^ "Aqua MAster PreCharger Series". iSoaker.com. http://www.isoaker.com/Armoury/Analysis/WaterWarriors_aquamaster_precharge_system.html. Retrieved 2009-07-20. 
  7. ^ "Super Soaker CPS 2000". iSoaker.com. http://www.isoaker.com/Armoury/Analysis/1996/cps2000.html. Retrieved 2009-07-20. 
  8. ^ "Water Ball SL175". Isoaker.com. http://www.isoaker.com/Armoury/Analysis/2003/wbsl175.html. Retrieved 2009-07-20. 
  9. ^ "Water Warriors Steady Stream". iSoaker.com. http://www.isoaker.com/Armoury/Analysis/2007/wwsteadystream.html. Retrieved 2009-07-20. 
  10. ^ "Super Soaker Quick Blast". Isoaker.com. http://www.isoaker.com/Armoury/Analysis/2008/quickblast.html. Retrieved 2009-07-20. 

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Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
How Products are Made. How Products are Made. Copyright © 2002 by The Gale Group, Inc. All rights reserved.  Read more
WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Water gun".  Read more