Tool driving or impacting – Drive controlled by relative axial movement of tool
Patent
1988-07-19
1989-07-25
Yost, Frank T.
Tool driving or impacting
Drive controlled by relative axial movement of tool
173 90, 91422, B23Q 500
Patent
active
048504378
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to pneumatic percussive tools used in the construction and mining industries, mechanical engineering and metallurgy, and more specifically, it deals with single-blow pneumatic percussive tools.
Background of the Invention
Pneumatic percussive tools, in particular, pneumatic hammers are used for marking, center-popping, riveting, marking-out and gate trimming. Depending on a specific application, the pneumatic hammer has a working member such as a stamp, center punch or chisel mounted in a casing having an interior space. The interior space of the casing accommodates a hammer piston dividing the interior space of the casing into an upper chamber and a lower chamber. An air distribution device is mounted on the casing. An energy carrier is compressed air which is supplied to the tool from a portable or stationary compressor along a flexible hose. During operation of the tool, the hammer piston axially reciprocates under the action of a gaseous fluid under pressure admitted to the working chambers through the air distribution device following the command of the operator to impart a blow to the end of the working member at every working cycle. The working member performs work under the action of blows whereby, depending on the type of the working member, marking, center-popping, trimming or riveting takes place.
Since operations performed by pneumatic hammers are effected with the direct participation of the operator, such hammers are to have minimum weight and size.
Known in the art is a single-blow pneumatic percussive tool (cf. USSR Inventor's Certificate No. 946912, Int. Cl. B 25 D 9/00), comprising a hollow cylindrical casing accommodating a reciprocatable hammer piston and an air distribution device disposed in a handle mounted on the casing. The hammer piston divided the casing interior into lower and upper chambers. The tool also has a tube adapted to establish communication between the lower chamber and gaseous fluid under pressure at regular intervals.
In this tool, the tube is mounted outside the casing so that auxiliary devices should be provided outside the tool. As a result, the size and weight of the tool held by the operator are increased.
Known in the art is a single-blow pneumatic percussive tool (cf. USSR Inventor's Certificate No. 683828, Int. Cl. B 21 C 51/00), comprising a hollow cylindrical casing accommodating a reciprocatable hammer piston dividing the interior space of the casing into upper and lower chambers. A spring-biased valve to which a working member is secured is mounted on the side of the lower chamber. An air distribution device having passages and a control lever is mounted on the side of the upper chamber. A tube for supplying gaseous fluid under pressure into the interior space of the chamber is mounted outside the casing.
The arrangement of the tube outside the casing leads to large size and heavy weight of the tool held by the operator.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a single-blow pneumatic percussive tool with such arrangement of a tube which would make it possible to reduce size of the tool.
This object is accomplished by that in a single-blow pneumatic percussive tool comprising a hollow cylindrical casing accommodating a reciprocatable hammer piston which divides the interior space of the casing into an upper chamber and a lower chamber, a spring-biased valve having a working member secured thereto and mounted on the side of the lower chamber for establishing communication of the lower chamber with atmosphere at regular intervals, an air distribution device having passages and a control lever, mounted on the casing on the side of the upper chamber and establishing communication of the upper chamber with gaseous fluid under pressure and atmosphere via the passages at regular intervals, a tube for admitting gaseous fluid under pressure to the lower chamber at regular intervals, and a retainer for retaining the hammer piston in the upper position, according to the invention, the
REFERENCES:
patent: 2960067 (1960-11-01), Osborne
patent: 3193024 (1965-07-01), Cleary
patent: 3273657 (1966-09-01), Willems et al.
patent: 3405602 (1968-10-01), Novak
patent: 3802516 (1974-04-01), Speicher
patent: 3803983 (1974-04-01), Amtsberg
Sudnishnikov Vadim B.
Zelentsov Andrei A.
Wolfe James L.
Yost Frank T.
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