# US 5,350,027 A · Drill machine table

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- Number: US 5,350,027 A
- Document ID: US5350027A
- Status: Granted
- Kind: A
- Application number: 07/930,509
- Filed: 1992-09-30
- Granted: 1994-09-27
- Earliest claimed: 1992-09-30
- Assignees: Delmag-Maschinenfabrik Reinhold Dornfeld GmbH & Co.
- Inventors: Magnus Mauch; Achim Kehrberger
- Web page: https://patentgrep.com/patent/US5350027A

## CPC

- E21B 7/021: {With a rotary table, i.e. a fixed rotary drive for a relatively advancing tool}
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A drilling machine for a mobile drilling appliance which includes a housing which is adapted to travel along a jobber, a drive motor mounted on said housing, a pinion operatively connected to said drive motor, a step-down gear rotatably engaging said pinion, a driving socket located in the vicinity of a side face of said housing that contains a central opening which is adapted to receive a driving shaft that in turn is adapted to be connected to a drilling tool, and a driving ring positioned in said driving socket and engageable with said step-down gear.

## Claims

### Claim 1

A drilling machine for a mobile drilling appliance which comprises in combination
(a) a housing (14, 16, 18) which is slidably mounted to a jobber (12),
(b) a drive motor (22) mounted on a part of said housing,
(c) a pinion (26) operatively connected to said drive motor (22),
(d) a step-down gear (32) rotatably engaging said pinion (26), the diameter of said step-down gear (32) being large in comparison with the diameter of said pinion (26),
(e) a driving socket (50) located in the vicinity of a side face of said housing (18), said socket (50) containing a central non-circular opening (52) receiving in an axially displaceable manner, a driving shaft (56) that in turn is connected to a drilling tool (60), and
(f) a driving ring (54) positioned in said driving socket (50) around said opening (52) and engageable with said step-down gear (32), the diameter of said driving ring (54) being small in comparison with the diameter of the surface of said step-down gear (32) that engages said pinion (26).

### Claim 2 (depends on 1)

A drilling machine according to claim 1 wherein one side face of said housing (14, 16) is provided with guide means (20) cooperating with the jobber (12).

### Claim 3 (depends on 2)

A drilling machine table according to claim 2 wherein said step-down gear rotates in a vertical plane adjacent to the guide means and meshes by way of a small bevel gear with said driving ring, said driving ring being constructed as a bevel gear.

### Claim 4 (depends on 1)

A drilling machine according to claim 1 wherein said housing includes a main housing section (14, 16) and an add-on housing section (18) attached to and extending outwardly from a side face of said main housing section (14, 16).

### Claim 5 (depends on 4)

A drilling machine according to claim 4 wherein said step-down gear (32) is mounted in said main housing section (14, 16).

### Claim 6 (depends on 5)

A drilling machine according to claim 5 wherein said driving socket (50) is mounted in said add-on housing (18).

### Claim 7 (depends on 1)

A drilling machine table according to claim 1 wherein said step-down gear (32) has a central, non-circular passage (40) receiving in an axially displaceable manner, a correspondingly non-circular driving shaft, said driving ring (54) as well as said pinion (26) meshing with said step-down gear (32).

### Claim 8 (depends on 1)

A drilling machine table according to claim 1 wherein said step-down gear has a central, non-circular passage receiving a drive part that includes a driving chain wheel, said driving socket includes a driven chain wheel, and a chain operatively connects the driving chain wheel with the driven chain wheel.