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Cutaway of the Day: M3 ‘Grease Gun’

The famously nicknamed ‘Grease Gun’ was officially designated the United States Submachine Gun, Cal. .45, M3, designed as a more cost effective alternative to the Thompson M1A1.  The M3 was designed by George Hyde who had spent decades working on submachine gun designs including the Hyde Model 35, the Bendix-Hyde Light Rifle and the short-lived Hyde M2 which was adopted as a substitute standard in April 1942 before it was declared obsolete in June 1943.

George Hyde’s M2, briefly adopted by the US military (source)

The Hyde M2 was selected by the US military in April 1942 however, the weapon proved to be too complex to produce in the scale needed and the US Army Ordnance Corps began to seek an alternative.  The British STEN was studied as an example of a simple, effective design which was easy to manufacture en masse and was also cheap to produce. Hyde and Frederick Sampson, the chief engineer of the Inland Division of General Motors, worked together on creating a simple design which could be mass produced.  Hyde designed the weapon’s action with Sampson using his experience in production engineering to devise how the gun could be made in the huge numbers required.  The designers took out patents covering the trigger mechanism, cocking mechanism, extending stock, bolt safety lock and the construction and fabrication methods for making the M3.

M3 in use in Vietnam (source)

The result was the M3, a simple blowback submachine gun made up of pressed and stamped steel parts spot and seam welded together which required very little time consuming machine time.  The M3 had a wire collapsable stock, enclosed pressed metal trigger and its only safety was a safety lock protruding from the dust cover which locked into the bolt preventing it from moving when the cover was closed.  The utilitarian design was in stark contrast to the wood and milled and blued steel of the Thompson.  The M3 was officially accepted by the US Army Ordnance Committee in December 1942.  Production was undertaken by General Motor’s Guide Lamp Division factory in Indiana which would also later manufacture the single shot M1942/Flare Projector Caliber .45 ACP ‘Liberator’ pistol and anExperimental Stamped M1911.

Perhaps the most complex part of the M3 was its cocking handle which used a crank action to push the bolt back and cock the action, this required approximately 18 lbs of force with the shoulder of the bolt being cut away to allow the pawl of the cocking piece to engage and push the bolt back. The trigger mechanism was also very simple with only fully automatic fire available.  Once fired the bolt recoiled along two guide rods against two recoil springs. The weapon had a relatively cyclic rate of 450 rounds per minute when compared with the Thompson’s 700 rpm.  

A partially disassembled M3 (source)

In 1944 reports of issues with the cocking mechanism led to the design being refined further.  The M1A1 was adopted in December 1944 and removed the cocking mechanism.  Instead the ejection port was elongated to allow operators to simply push the bolt back with their fingers to cock the weapon.  This also lightened the weapon from 8.2 lbs to 7.9 lbs and the safety lock on the inside of the dust cover was moved further back to ensure it engaged with the bolt better when closed.

The weapon was initially chambered in the standard US .45 ACP pistol cartridge however, by replacing the barrel and bolt and fitting an adapter the weapon could be converted to fire 9mm from STEN magazines. However, while this was possible it was not widely done as the British and Commonwealth forces which used 9mm had an ample supply of STENs.

M3A1 c.1950 (source)

Problems with magazine feeding beset the M3 throughout its service life.  The weapon fed from a double-stack, single-feed 30-round detachable box magazine which often jammed when mud and the vulnerable feed lips could easily be bent.  Despite this it replaced the Thompson as the US Army’s standard issue submachine gun in mid 1945 and remained in service during the Korean and Vietnam Wars.

Approximately 700,000 M3s were manufactured between 1943-1945 and during the Korean War.  They remained in service well into the 1960s with some tank and engineer units being issued them as late as the 1990s.  Some remain in use around the world with countries including the Philippines and Macedonia.  

Sources:

Image One Source

Image Two Source

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Image Four Source

The Complete Machine Gun, I.V. Hogg, (1979)

Military Small Arms, I. Hogg & J. Weeks, (1985)

Rifles & Submachine Guns, F. Myatt, (1981)

[Rumor] LG pode ter que pagar à Microsoft US$ 3 por dispositivo Android vendido

Rumores dão conta que a Microsoft, agregando mais valor ao seu ganha-pão derivado das vendas de dispositivos Android, estaria prestes a propor um acordo de licenciamento de patentes com a LG.

Neste novo negócio lucrativo para Microsoft, seria fixado o pagamento de 3 dólares à empresa por cada dispositivo Android vendido pela LG mais a adoção do Windows Phone em parcela dos aparelhos da sul-coreana.

Acordo semelhante já foi fechado com a Samsung e a HTC, e recentemente a COMPAL teve que se curvar também aos direitos relacionados ao portfólio de patentes da Microsoft. Cerca de 55% de fabricantes ODM Android e Chrome OS já fecharam acordo com a Microsoft.

Nenhum dos lados confirma os rumores, mas se espera que o acordo seja concluído no dia 10 novembro na APEC CEO Summit no Havaí, e não será nenhuma surpresa se nos próximos dias tivermos algo mais sólido quanto a isso.

Via Electronista

Esta es la misma táctica que hemos visto una y otra vez por parte de Microsoft. Tras su fracaso en el mercado de los smartphones, están recurriendo a medidas legales que no son otra cosa que extorsionar las ganancias de otros
— 

Tras el anuncio de que Samsung pagará a Microsoft por las patentes que posee en Android, la reacción en Google no se ha hecho esperar, y como es de suponer, están mas que molestos.

También que esperaban? Esta es la política de siempre por parte de Microsoft y similares.

ITC rejeita declarações da Google e da T-Mobile contra proibição de importação dos produtos HTC para os EUA

A HTC mais uma vez corre sério risco de ver proibida a importação dos seus aparelhos Android para os EUA. A Apple vem construindo clara vantagem na briga administrativa no âmbito da Comissão de Comércio Internacional dos EUA (ITC). Um juiz administrativo da ITC já havia identificado violação de patentes da “Maçã” nos aparelhos da HTC e uma revisão desta decisão está prevista para 06 de dezembro de 2011.

Antes disso, o órgão administrativo norte-americano, como parte do processo, abriu oportunidade de o público em geral apresentar declarações de interesse público acerca de possível impacto negativo relativo à proibição de importação dos produtos da taiwanesa. Ocasião na qual Google e T-Mobile apresentaram seus temores alegando possibilidade de demissão em massa de trabalhadores e afetação da rede de primeiros socorros.

Pois bem, equipe vinculada ao gabinete da ITC rejeitou esses argumentos afirmando que existem outros produtos alternativos rodando o OS Android, bem como dispositivos da própria HTC com outros sistemas operacionais, como o Windows Phone.

Via Foss Patents

HTC perde mais uma batalha contra a Apple

A HTC havia protocolado uma queixa contra a Apple na ITC - Comissão de Comércio Internacional dos EUA, acusando-a de violar algumas de suas patentes. No entanto, uma das acusações já foi afastada por um julgador da comissão.

A empresa taiwanesa se pronunciou afirmando que está confiante de que possui um bom fundamento para recorrer da decisão e considera-se totalmente preparada para proteger sua propriedade intelectual.

Via Engadget