Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Having tool-opposing – work-engaging surface
Patent
1993-09-24
1995-04-25
Bishop, Steven C.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Having tool-opposing, work-engaging surface
408 87, 408111, 408129, B23B 4100, B23B 4718, B23B 4900
Patent
active
054093287
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a drilling machine that drills boltholes for fastening connecting plates on abutting railroad rails during the laying and repair of a railroad track.
2. Description of Related Art
Connecting plates are positioned for reinforcement on railroad rails and fastened to them with bolts during the laying of railroad track and the replacement of worn track. During this process, a specified number of boltholes are drilled in the middle part of the rail. However, since the drilling height and pitch of the bolt insertion holes on the connecting plates are predetermined for each type of rail, holes must be drilled in the rails to match the bolt insertion holes on the connecting plates.
The conventional method of drilling boltholes in railroad rails was to first determine the position of the holes to be drilled in each rail and then make punch marks, after which a drill was directed to the marks and the holes were drilled. Marking and punching each rail was tedious and handling the heavy drilling machine was a cumbersome task. There was thus a demand for a drilling machine capable of the simple and rapid operation needed when changing railroad rails in emergencies.
The present invention, devised out of the need to address such drawbacks present in the prior art, has, as its object, to provide a drilling machine for railroad rails that requires none of the marking and punching of conventional rail drilling procedures, and that permits simple and rapid adjustment of the drilling machine on, and drilling of, all types of rail.
SUMMARY OF THE INVENTION
The present invention, a drilling machine for railroad rails, has a configuration in which the rotating drive source 3 of a cutter for drilling 2 is housed in a main body case 1 and is secured in such a way that output shaft 4 extends outward and slide shafts 5, 5 are positioned along the sides of main body case 1. The rotating drive source 3 is centered between the slide shafts. A clamp arm 7 is provided with a support shaft permitting unobstructed movement opposite a catch frame 6, which is secured on the two output shaft ends 5a, 5a of slide shafts 5, 5. A clamping means is configured by a gripping surface 6a of catch frame 6 opposite a twin-tined hook member 7a below clamp arm 7 to grip a railroad rail 8 crosswise and from both sides. An upper rail support 9c, facing inward is secured on the inside of gripping surface 6a of catch frame 6, and a height gauge 10 with a through-hole 11 drilled approximately in its center is bolted to the same surface.
Two medial rail supports 9a, 9a are juxtaposed on the height gauge 10 with a gap between them, and various screw holes 12, 12, etc., into which upward rail supports 9b, 9b can be threaded to position them on height gauge 10, according to the designated drilling heights of boltholes 13 for each type of railroad rail, are provided on height gauge 10. A pitch gauge 20, on which numerous countersinks 21, 21, etc. are positioned in relation to the end of, or at a specified spot on, railroad rail 8 so as to correspond to the pitch designated for the boltholes 13 of each type of railroad rail, is mounted before drilling on the upper surface of the railroad rail 8 to be drilled so as to be readily removable. A clamp screw 14 having a rotating handle 14a is threaded vertically down through a tapped cylinder 7b on the upper end of clamp arm 7 over the axial center of cutter 2.
The lower end 14c of clamp screw 14 is aligned with a specific countersink 21 on pitch gauge 20 and tightened to secure the clamp means in position, and significant pressure is perpendicularly maintained from above and below as well as in a horizontal direction on railroad rail 8 by the clamp means. Retaining plate 15 is secured on the back ends of slide shafts 5, 5. A link mechanism 16, for advancing and retracting main body case 1 using retaining plate 15 as a support point and having a rotating handle 16a, is positioned between main body case 1 and retaining plate 15. Cut
REFERENCES:
patent: 3706505 (1972-12-01), Stougaard
patent: 3945749 (1976-03-01), Mollrath
Bishop Steven C.
Kabushiki Kaisha Yamazaki Haguruma Seisakusho
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