초록 ▼

An undercutter attachable to utility machines has a bar with chain having teeth for cutting into rock beds, whereby the chain rotates about the bar. The bar has removable top and bottom portions, which when in place and secured, provide a channel for the chain, and when the top and bottom portions a

An undercutter attachable to utility machines has a bar with chain having teeth for cutting into rock beds, whereby the chain rotates about the bar. The bar has removable top and bottom portions, which when in place and secured, provide a channel for the chain, and when the top and bottom portions are removed, allow for replacement of worn parts without loosening or removing the chain.

대표청구항 ▼

1. An undercutter comprised of an elongated bar having a chain guide channel for guiding a continuous chain, first rotatable sprocket means attached to the elongated bar, a continuous chain having attached teeth for cutting and removing material and revolving around the elongated bar and second rota

1. An undercutter comprised of an elongated bar having a chain guide channel for guiding a continuous chain, first rotatable sprocket means attached to the elongated bar, a continuous chain having attached teeth for cutting and removing material and revolving around the elongated bar and second rotatable sprocket means in the chain guide channel, drive means for moving the continuous chain, wherein said elongated bar is comprised of an elongated middle rigid bar member having two ends being a distal end and a base end and having a top face and a bottom face in between the two ends, a top rigid member attached to the top face, a bottom rigid member attached to the bottom face, wherein the top rigid member and bottom rigid member in combination with the middle rigid bar member together create the chain guide channel between the top rigid member and bottom rigid member, and wherein at least one of the top rigid member and bottom rigid member is removably attached to the middle rigid bar member, and wherein said undercutter has means for attaching the undercutter to an external device, said external device having means for positioning the undercutter in desired positions during use. 2. The undercutter in claim 1 wherein at least one of the top and bottom rigid members is comprised of at least two rigid segments each of said rigid segments having two opposing ends, and each rigid segment having means for removably attaching each rigid segment to the middle rigid bar member. 3. The undercutter in claim 1 wherein the top rigid member and bottom rigid member is comprised of a plurality of rigid segments with means for removably attaching said rigid segments to the middle rigid bar member. 4. The undercutter in claim 2 wherein the rigid segments have wear resistant means affixed to resist wear from the continuous chain. 5. The undercutter in claim 3 wherein the rigid segments have wear resistant means affixed to resist wear from the continuous chain. 6. The undercutter in claim 4 wherein the resistant means are comprised of a chrome carbide overlay. 7. The undercutter in claim 5 wherein the resistant means are comprised of a chrome carbide overlay. 8. The undercutter in claim 2, 3, 4, 5, 6, or 7, wherein the rigid segments are reversible. 9. The undercutter in claim 2, 3, 4, 5, 6, or 7 wherein at least two of the rigid segments are interchangeable. 10. The undercutter in claim 2, 3, 4, 5, 6, or 7 wherein at least one of the rigid segments is flippable. 11. The undercutter in claim 2, 3, 4, 5, 6, or 7 wherein at least two rigid segments are reversible, interchangeable and flippable. 12. The undercutter in claim 2 wherein the ends of each rigid segment have means for preventing said ends from interfering with the chain movement. 13. The undercutter in claim 3 wherein the ends of each rigid segment have means for preventing said ends from interfering with the chain movement. 14. The undercutter in claim 12 or 13 wherein the means for preventing the continuous chain from interfering with the continuous chain movement are comprised of beveling the ends of the rigid segments. 15. An undercutter comprised of an elongated bar having a chain guide channel for guiding a continuous chain, rotatable sprocket means attached to the elongated bar, a continuous chain having attached teeth for cutting and removing material and said chain revolving around the elongated bar and sprocket means in the chain guide channel drive means for moving the continuous chain, and wherein said elongated bar is comprised of an elongated middle rigid bar member having two ends being a distal end and a base end, and a top face and bottom face in between the two ends, at least two top rigid members with means for removably attaching them to the top face, and at least two rigid bottom members with means for removably attaching them to the bottom face, wherein the top rigid members and bottom rigid members in combination with the middle rigid bar member together create the chain guide channel between the top rigid members and bottom rigid members, and wherein the top rigid members and bottom rigid members can be removed without loosening the continuous chain, and wherein said undercutter has means for attaching the undercutter to an external device, said external device having means for positioning the undercutter in desired positions during use.