发明名称 |
Drilling unit for stadium seats |
摘要 |
A drilling machine is disclosed for use in providing bolt holes in concrete stadium riser steps and the like. The drilling machine includes a relatively stationary base plate, and a foot plate slideable upon the base plate along a predetermined path. The foot plate carries drill mounting means for mounting a plurality of commercially available drills. An operating lever moves the foot plate, drill mounting device and drills toward and away from a vertical drilling face over the base plate.
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申请公布号 |
US4059162(A) |
申请公布日期 |
1977.11.22 |
申请号 |
US19760696047 |
申请日期 |
1976.06.14 |
申请人 |
LAWRENCE BROTHERS, INC. |
发明人 |
ZBINDEN, JAMES;RIES, GEORGE W. |
分类号 |
B25H1/00;E21B15/04;E21B19/24;(IPC1-7):E21C9/00 |
主分类号 |
B25H1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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