Pneumatic hand tool with vacuum debris removal
AssigneeRobert Bosch GmbH
InventorsHermann Krotz, Robert Klenk
Life of this patent
Estimating the term…
Abstract
To remove, by suction, chips and debris arising in operation of a hand-cutting tool, for example a sheet-metal nibbling tool, a saber saw, or the like, an ejection nozzle is surrounded by a preferably plastic body defining, internally a Venturi, and externally of the ejection nozzle a vacuum, underpressure or suction chamber which is connected through a preferably flexible hose to a suction pick-up nozzle, removably attached adjacent a reciprocating tool at the working or cutting head of the tool. The suction pick-up nozzle preferably includes a chamber in direct air communication with the tool so that chips which arise in tool operation are directly drawn into the pick-up nozzle for removal, by air flow suction, through the suction duct and to a collecting and disposal hose.
Claims20
Chip generating, pneumatically operated hand tool, especially sheet metal nibbling tool, with vacuum chip removal device, especially to remove metal chips, comprising
- a tool housing (10);
- a compressed air inlet (12) to supply operating compressed air to the tool;
- a cutting head (42) mounted on the tool housing and having a reciprocating cutting tool (46) thereon, and receiving operating power from compressed air supplied to the inlet;
- an exhaust port (14) formed in the tool housing from which a stream of flowing air is being ejected in operation of the tool,
- a vacuum injection nozzle (18) pneumatically connected to the exhaust port;
- means (20, 22, 34, 40) defining a Venturi and a suction or underpressure chamber;
- a suction duct (78) connected to the suction or underpressure chamber to have suction applied thereto;
- and a suction nozzle (60) positioned adjacent the cutting head (42) of the tool and pneumatically connected to said suction duct to remove cutting chips or debris arising in cutting operation of the tool for transport, by pneumatic suction, from the nozzle through said suction duct to the suction or underpressure chamber for removal through a removal duct or hose (24);
- wherein the suction nozzle comprises a nozzle (60) and a suction duct (68) formed therein;
- and the cutting head (42) includes a guide element (48) surrounding a portion of the cutting element (46) of the tool, extending inside the nozzle body and being in pneumatic communication with said suction duct (68) to transport chips and debris arising in cutting during reciprocating action of the cutting element and transported by the cutting element into the nozzle body for removal by suction by the suction duct.
For combination with a compressed air, reciprocating hand tool having a tool housing:
- a reciprocating cutting head (42) mounted on the tool housing, and an air exhaust port (14) formed on the tool housing from which, in operation of the tool, a stream of air emanates,
- a vacuum debris removal apparatus comprising, in accordance with the invention,
- a vacuum ejection nozzle (18);
- means (20, 22, 34, 40) defining a Venturi and suction or underpressure chamber for cooperation with said vacuum ejection nozzle;
- a suction duct (78) connectable to the suction or underpressure chamber to have suction applied thereto in operation of the tool;
- and a suction nozzle (60) positionable to surround a portion of the reciprocating cutting head (42) of said tool and connectable with said suction duct (78),
- said vacuum injection nozzle having means (26) for attachment of the nozzle to a tool to place the nozzle into air flow communication therewith, the suction nozzle (60) comprising a nozzle body having means (62, 64, 66) for attachment of said suction nozzle to a tool and surrounding the cutting head thereof.
Dependencies are inferred from the claim text.