Hammer drill with hard hammer support structure
First Claim
1. A hammer-drill comprising:
- a drill housing supporting an output spindle, the drill housing comprising a first material having a first hardness;
a rotating hammer member mounted on the output spindle to rotate with the output spindle, the rotating hammer member comprising ratchet teeth;
a non-rotating hammer member mounted around the output spindle and radially adjacent the first material of the drill housing, the non-rotating hammer member comprising cooperating ratchet teeth and a plurality of support surfaces;
a plurality of support members, each of the support members providing a cooperating support surface against which one of the plurality of support surfaces contacts to inhibit rotation of the non-rotating hammer member relative to the housing during a hammer mode operation, the support members comprising a second material having a second hardness which is harder than the first material;
a plurality of first support recesses in the drill housing, each of the first support recesses receiving a first end of the support members; and
a plurality of second support recesses in the drill housing, each of the second support recesses receiving a second end of the support members.
1 Assignment
0 Petitions
Accused Products
Abstract
A drill housing supports an output spindle comprising a material that is relatively soft. The non-rotating hammer member can be mounted around the output spindle, adjacent its forward end, and adjacent the relatively soft material of the drill housing. The non-rotating hammer member can include support slots located along its edge. Support rods that are made of a relatively hard material can extend through the support slots to support the non-rotating hammer member. A plurality of recesses can be provided in the relatively soft material of the drill housing to support the non-rotating hammer member. A hammer mode shift mechanism can be configured to move the non-rotating hammer member along the support rods between a first position corresponding to a non-hammer mode and a second position corresponding to a hammer mode. The relatively hard support rods support the non-rotating hammer member to thereby resist damage to the relatively soft material of the housing member.
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Citations
36 Claims
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1. A hammer-drill comprising:
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a drill housing supporting an output spindle, the drill housing comprising a first material having a first hardness; a rotating hammer member mounted on the output spindle to rotate with the output spindle, the rotating hammer member comprising ratchet teeth; a non-rotating hammer member mounted around the output spindle and radially adjacent the first material of the drill housing, the non-rotating hammer member comprising cooperating ratchet teeth and a plurality of support surfaces; a plurality of support members, each of the support members providing a cooperating support surface against which one of the plurality of support surfaces contacts to inhibit rotation of the non-rotating hammer member relative to the housing during a hammer mode operation, the support members comprising a second material having a second hardness which is harder than the first material; a plurality of first support recesses in the drill housing, each of the first support recesses receiving a first end of the support members; and a plurality of second support recesses in the drill housing, each of the second support recesses receiving a second end of the support members. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A multi-mode hammer drill comprising:
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an output spindle; a drill housing having a first portion and a second portion, the first portion supporting the output spindle and comprising a first material having a first hardness; a rotating hammer member mounted to the output spindle for rotation therewith, the rotating hammer member comprising first ratchet teeth; a non-rotating hammer member mounted around the output spindle, the non-rotating hammer member comprising second ratchet teeth and a plurality of support apertures; a plurality of elongated support members, each of the elongated support members extending through an associated one of the support apertures, the elongated support members comprising a second material having a second hardness that is harder than the first hardness; a plurality of first support recesses in the first material of the first portion, each of the first support recesses receiving a first end of the elongated support rods; a plurality of second support recesses formed in the second portion, each of the second support recesses receiving a second end of the support rods; and a hammer mode shift mechanism configured to move the non-rotating hammer member along the support members between a first position corresponding to a non-hammer mode wherein the cooperating ratchet teeth of the non-rotating member are prevented from contacting the ratchet teeth of the rotating member and a second position corresponding to a hammer mode wherein the cooperating ratchet teeth of the non-rotating member are permitted to contact the ratchet teeth of the rotating member. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A multi-mode hammer drill comprising:
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a drill housing supporting an output spindle and comprising a transmission housing and a forward end cap, each of the transmission housing and the end cap comprising a first material having a first hardness; a rotating hammer member mounted adjacent the forward end of the output spindle to rotate with the output spindle, the rotating hammer member comprising ratchet teeth; a non-rotating hammer member mounted around the output spindle, adjacent the forward end of the output spindle, and adjacent the first material of the drill housing, the non-rotating hammer member comprising cooperating ratchet teeth and a plurality of support slots located along an edge of the non-rotating hammer member; a plurality of elongated support rods, each of the elongated support rods extending through one of the support slots, the support rods being comprising a second material having a second hardness which is harder than the first hardness; a plurality of first support recesses in the first material of the transmission housing, each of the first support recesses receiving a first end of the elongated support rods; a plurality of second support recesses in the first material of the end cap, each of the second support recesses receiving a second end of the elongated support rods; and a hammer mode shift mechanism configured to move the non-rotating hammer member along the support rods between a first position corresponding to a non-hammer mode wherein the cooperating ratchet teeth of the non-rotating member are prevented from contacting the ratchet teeth of the rotating member and a second position corresponding to a hammer mode wherein the cooperating ratchet teeth of the non-rotating member are permitted to contact the ratchet teeth of the rotating member. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification