| 摘要 |
Rotary impact hammers, which are primarily used for breaking up concrete, asphalt or frozen ground, include a rotating shaft with impacting members mounted thereon for repeatedly engaging a hammer to reciprocate the latter. The present invention includes rollers mounted on pivot arms which are urged by centrifugal forces into engagement with the inner wall of a casing. A reciprocating hammer is mounted on the casing with an anvil end extending into the casing for engagement by the rollers. In order to reduce wear on the rollers and on the inner surface of the casing, the hammer is tilted into the direction of travel of the rollers, so that the rollers engage a ramp on the inner or top end of the hammer. A reduced diameter area of the rollers engages the anvil end of the hammer, to reduce wear on the inner surface of the casing, particularly around the hole for the hammer.
|
