US2874596A

US2874596A - Radial drilling machine

Info

Publication number: US2874596A
Application number: US510212A
Authority: US
Inventors: Witzig Emil Karl
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-02-03
Filing date: 1955-05-23
Publication date: 1959-02-24
Anticipated expiration: 1976-02-24

Description

Feb. 24, 1959 E. K. WlTZlG RADIAL DRILLING MACHINE Filed May 23, 1955 invenivr Emil KWifZfa mam 5. 5mm

United States Patent 2,874,596 RADIAL DRILLING MACHINE Emil Karl Witzig, Reutlingen, Germany Application Ma 23, 1955, Serial No. 510,212 Claims priority, application Germany February 3, 1949 Section 1, Public Law 690, August 8, 1946 Patent expires February 3, 1969 8 Claims. (Cl. 77 -28) and in which the flanges of the beam are eifectively protected from dust and-dirt.

Another specific object of this invention is to provide a radial drilling machine in which the drilling head can be brought close up to the pillar so that the bending load on the beam is reduced to a minimum. This permits ofimproved accuracy in drilling, in particular where holes of large diameter are to be drilled.

A further specific object of the invention is to provide a radial drilling machine in which the wear of the drilling tool is reduced as far as possible.

Yet another specific object of the invention is to provide a radialdrilling machine with a play-free support of the beam and with a rigid construction ofvthe housing.

With these and other objects in view which will appear as the description proceeds the invention consists. of certain novel featuresof construction as willbe particularly pointed out in the appended claims.

The manner of carrying the invention into effect is hereinafter described by way of example, reference being had to the accompanying drawings in which:

' Fig! 1 is a side elevation of the radial drilling machine Fig. 2 a half-section through the'guidinghousing at right angles to the beam taken on the'line 2-2 in Fig- In the base 1 of the radial"d'rilling"machine which carries the workutablejflis mountedythei vertical pillar 3.

On top of the pillar 3 is fixed the housing 4 in which the beamS is slidably guided in a lengthwise direction.

The beam 5 carreis the drilling head ,6 with the driving motor 7 and the lever 8'for advancing the tool.

t On the lower end of the vertical pillar 3 is arranged a. grooved collar 9 in which engages the roller"11 .arranged at one end of a bell crank 10. The other enact the bell crank is connectedby alsuitabletransmission 12, .13 with a hand wheel 14 by means of which. the bell crank can be rocked and, therefore, the pillar,;3'moved upand down. A helical spring 15 isidisposed 'coaxially with the pivotal axis of the bell crank 10, which spring is maintained tensioned by the projection 16 on the upper arm of the bell crank 10 and'so counteracts the weight of the vertical pillar 3, the housing 4 with the beam 5 that only relatively small forces have to be appliedto the hand wheel 14 to lift the pillar 3.

The beam 5 is of I-profile and consequently possesses great resistance to bending and torsion stresses. The

inner surface of the upper flange 17 of the beam 5 runs on a roller 18, while the inner surface of the lower flange 19 is guided by a roller 20.

On each side of the web 21 of the beam 5 are provided two opposed and similar pairs of

rollers

18, 20. Since the beam 5 is supported both at the front and rear end of the housing 4 on such a roller guidance there are, therefore, in all, four pairs of

rollers

18, 20.

The rollers 18, are mounted, respectively, on a common axle 22. The smaller roller 20 is directly at tached to the axle 22 which runs in ball bearings 23. Outside these bearings 23 rotates the sleeve 24 to which is fixed the larger roller 18. The sleeve 24 rotates in its turn on ball bearings 25 in a bearing bush 26 which is fixed to a bearing support 27 on the housing 4.

The bearing surfaces of the

rollers

18 and 20 and the beam 5 are inclined at a small angle, e. g. 15, to the horizontal. The symmetrical arrangement of the two pairs of

rollers

18, 20 on both sides of the web 21 of the beam 5 causes the bearing surfaces of the opposed pairs 7 of rollers to be inclined .in opposite direction to the horizontal.

Internally screw threaded

rings

28, 29 bear against the outer and inner end faces of the bearing support 27 with the aid of which rings the bearing bush 26, which has a corresponding external thread, and thereby the whole of the roller assembly can be adjusted in the axial direction. Consequently. the

rollers

18 and 20 can be adjusted on both sides against the ground bearing surfaces of the beam 5 in such a way that a perfect play-free and even in certain circumstances prestressed guiding of can be made at the maximum distance from the pillar 3 obtainable with the beam 5.

At either or both ends of the beam two or more working spindles can be placed close together either on its end face or on a longitudinal face, these serving for drilling, reaming or tapping, so that, for example, a series of holes can be consecutively drilled, reamed and tapped in a heavy voluminous and not easily movable workpiece. It is convenient in this case to arrange the drilling spindle centrally so that no twisting stresses are produced in the beam and its guiding means by the drilling pressure.

Heavy cumbersome workpieces which cannot be placed on the work table because of their volume can be deposited at the side of the machine remote from the work table. By swinging the beam through work can be done on the workpiece also at this side of the machine..

If there is arranged a drilling head at each end of the beam of the machine, it is possible to work with the drillinghead on the one side or with that on the other side of the beam according to the position of the bores. The foregoing description. is directed solely towards the constructions illustrated, but I desire it to be'understood that I reserve the privilege of resorting to all mechanical changes to which the device is susceptible, the invention being defined and limited only by the terms of the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is: 1. In a machine tool, in combination, a vertical pillar;

a tool supporting beam mounted on said pillar for movement in direction normal thereto, said supporting beam having a cross-section of an I-beam and the vertical plane of symmetry through the web of the I-beam located substantially in a plane through the axis of the pillar; and guide means for guiding said supporting beam in said direction of movement and including at each side of the web of said I-beam at least two pairs of rollers and the rollers of each pair of said rollers engaging opposite inner surfaces of flanges of said l-beam.

2. In a machine tool, in combination, a vertical pillar; a horizontal tool supporting beam mounted on said pillar for movement in direction normal thereto, said supporting beam having a central vertical web and an upper and a lower flange forming together a substantially I-shaped cross-section and the vertical plane of symmetry through the web of the I-beam located substantially in a plane through the axis of the pillar; and guide means for guiding said supporting beam in said direction of movement and including at each side of said web at least two pairs of rollers and the rollers of each pair of rollers engaging respectively inner surfaces of said upper and said lower flanges of said supporting beam.

3. In a machine tool, in combination, a vertical pillar; a horizontal tool supporting beam mounted on said pillar for movement in direction normal thereto, said supporting beam having a central vertical web and an upperand a lower flange forming together a substantially I-shaped cross-section and the vertical plane of symmetry through the web of the l-beam located substantially in a plane through the axis of the pillar; and guide means for guiding said supporting beam in said direction of movement and including at each side of said web at least two pairs of rollers and the rollers of each pair of rollers engaging respectively inner surfaces of said upper and said lower flanges of said supporting beam, said upper and, said lower flanges having respectively oppositely inclined inner surfaces including an angle up to about 30 to a horizontal surface.

4. In a machine tool, in combination, a horizontal tool supporting beam reciprocable in longitudinal direction thereof, said supporting beam having a central vertical web and an upper and a lower flange forming together a substantially Lshaped cross-section; and guide means for guiding said supporting beam in said direction of movement and including at each side of said web at least two pairs of rollers and the rollers of each pair of rollers engaging respectively inner surfaces of said upper and said lower flanges of said supporting beam and being arranged for rotation about a common axis, said upper and said lower flanges having respectively oppositely inclined inner surfaces including an angle up to about 30 to a horizontal surface. v

5. in a machine tool, in combination, a horizontal tool supporting beam reciprocable in longitudinal. direction thereof, said supporting beam having a central vertical web and an upper and a lower flange forming together a substantially I-shaped cross-section; guide means for guiding said supporting beam in said direction of movement and including at each side of said web at least two pairs of rollers and the rollers of each pair of rollers engaging respectively inner surfaces of said upper and said lower flanges of said supporting beam and being arranged for rotation about a common axis, said upper and said lower flanges having respectively oppositely inclined inner surfaces including an angle up to 30 to a horizontal surface; and adjusting means. for adjusting the position of each of said pair of rollers in the direction of the axis thereof. r

6. In a machine tool, in combination, a horizontal tool supporting beam reciprocable in longitudinal direction thereof, said supporting beam having a central vertical web, an upper flange and a lower flange forming together a substantially I-shaped cross-section, said upper and said lower flange having respectively oppositely inclined inner surfaces including an angle up to about 30 to a horizontal surface; and guide means for guiding said supporting beam in said direction of movement and including at least two pairs of rollers arranged at each side of said web, the rollers of each pair of said rollers engaging respectively said inner surfaces of said upper and said lower flanges of said supporting beam and one of the rollers in each pair of said rollers having a diameter larger than the diameter of the other roller of said pair of rollers and, being mounted for rotation about its axis on asleeve coaxial with the axis of said othervroller.

7. In a machine tool, in combination, a horizontal tool supporting beam reciprocable in longitudinal direction thereof, said. supporting beam having a central vertical web, an upper flange and a lower flange forming together a substantially l-shaped cross-section, said upper and said lower flanges having respectively oppositely inclined inner surfaces including an angle up to about 30 to a horiz ontal surface; and guide means for guiding said supporting beam in said direction of movement and including at least two pairs of rollers arranged at each side of said Web, the rollers of each pair of said rollers engaging respectively said inner surfaces of said upper and said lower flanges of said supporting beam and one of the rollers in each pair of said rollers having a diameter larger than the diameter of the other roller of said pair of rollers and being mounted for rotation about its axis on a sleeve coaxial with the axis of said other roller, and bearing means for said other roller mounted in said sleeve.

8. In a machine tool, in combination, a horizontal tool supporting beam reciprocable in longitudinal direction thereof, said supporting beam having a central vertical web and a lower flange and an upper flange extending laterally from said central web farther than said lower flange and forming together with said central web a substantially I-shaped cross-section; and guide means for guiding said supporting beam in said direction of movement and including at each side of said web at least two pairs of rollers andthe rollers of each pair of rollers engaging respectively inner surfaces of said upper and said lower flanges of said supporting beam and being arranged for rotation about a common axis, said upper and said lower flanges having respectively oppositely inclined inner surfaces including an angle up to about 30 to a horizontal surface.

References; Cited in the file of this patent UNITED STATES PATENTS