iRobot, the Massachusetts maker of Roomba robotic vacuums, has filed for Chapter 11 bankruptcy protection and agreed to sell substantially all of its assets to its primary supplier and contract manufacturer, Picea Robotics, in a deal that would take the company private.Gary Cohen called the restructuring and proposed sale "a pivotal milestone in securing iRobot's long-term future," saying the transaction will strengthen the company’s financial position, provide continuity for consumers, customers and partners, and allow operations, apps and product support to continue without disruption while the company pursues its product roadmap.The filing follows a steep decline after Amazon's proposed $1.7 billion acquisition collapsed amid a European Union regulatory veto threat and after a 46 percent tariff on Vietnam-made goods eroded margins, leaving sales and cash reserves weakened, shares plunged 72 percent to $1.20 the next trading day, longtime leader Colin Angle had departed earlier and iRobot warned that common stock holders will receive no recovery if the court approves the sale as regulators and the bankruptcy court weigh the outcome for creditors and stakeholders.