Hammer with vibration reduction mechanism
AssigneeSP Air Kabushiki Kaisha
InventorShigeki Kobayashi
Life of this patent
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Abstract
A power-driven hammer including a body including a tubular housing and a barrel assembly received in the housing. The barrel assembly has an at-rest position relative to the housing. The barrel assembly includes a barrel having a forward end adapted to hold a tool, an opening, and a rearward end. The barrel assembly includes a mass received in the opening of the barrel. The mass moves in the barrel opening when the hammer is operating through a power stroke and a return stroke. The barrel assembly moves forward and rearward from its at-rest position relative to the housing when the hammer is operating. The hammer includes a vibration reducing mechanism connecting the barrel assembly to the body reducing shock transmitted to the housing as the mass moves forward and rearward in the barrel.
Claims13
A power-driven hammer comprising:
- a body including a tubular housing;
- and
- a barrel assembly received in the housing having an at-rest position relative to the housing when the hammer is not operating, the barrel assembly comprising:
- a barrel having a forward end adapted to hold a tool, an opening, and a rearward end opposite the forward end;
- and
- a mass received in the opening of the barrel, the mass moving in the barrel opening when the hammer is operating through a power stroke, in which the mass moves toward the forward end of the barrel to strike the tool when held in the barrel, and a return stroke, in which the mass moves toward the rearward end of the barrel;
- the barrel assembly moving forward and rearward from its at-rest position relative to the housing when the hammer is operating;
- and
- a vibration reducing mechanism connecting the barrel assembly to the body reducing shock transmitted to the housing as the mass moves forward and rearward in the barrel.
A power-driven hammer comprising:
- a housing;
- a barrel assembly mounted on the housing having an at-rest position with respect to the housing when the hammer is not operating, the barrel assembly comprising:
- a barrel having a forward end, an opening, and a rearward end opposite the forward end;
- and
- a mass moveably received in the barrel opening, the mass oscillating back and forth in the barrel opening between a power stroke and a return stroke;
- the barrel assembly moving forward and rearward from its at-rest position relative to the housing when the hammer is operating;
- and
- a vibration reducing mechanism mounted between the barrel assembly and the housing comprising:
- a fastener having a head mounted on the barrel assembly and slidably received by the housing;
- a first spring held by the fastener between the barrel assembly and the housing;
- and
- a second spring held by the fastener between the housing and the head of the fastener.
Dependencies are inferred from the claim text.