GB1585670A

GB1585670A - Percussion rock drilling apparatus

Info

Publication number: GB1585670A
Application number: GB51564/77A
Authority: GB
Original assignee: Salzgitter Maschinen und Anlagen AG; Salzgitter Maschinen AG
Current assignee: Salzgitter Maschinen und Anlagen AG; Salzgitter Maschinen AG
Priority date: 1977-01-26
Filing date: 1977-12-12
Publication date: 1981-03-11
Also published as: FR2378941A1; PL204183A1; PL110752B1; DE2703085A1; FR2378941B3

Description

(54) PERCUSSION ROCK DRILLING APPARATUS (71) We, SALZGITTER MASCHINEN UND ANLAGEN AKTENGESELLSCHAFT, a German Company of Windmuhlenbergstrasse 20-22, 3320 Salzgitter 51, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention refers to percussion rock drilling apparatus and particularly to such apparatus comprising a percussion drilling drive which includes a percussion device and a rotary drive secured to the percussion device and including a motor and a reduction gear.

In a known percussion rock drilling apparatus of this kind (German Gebrauchsmuster 7 141 445) the motor and a part of the reduction gear are arranged behind the percussion device. The gear parts arranged in front of and behind the percussion device are connected with each other by a shaft arranged on one side of the percussion device. In particular, in the drilling of acceptance holes for rock bolts, the comparatively large length of the known percussion rock drilling apparatus is disadvantageous. Furthermore, the shaft with its associated housing requires valuable lateral space.

In another known percussion rock drilling apparatus of the aforementioned type (German published specification 2 517 213) the whole gear is arranged in front of the percussion device; however, it extends in uneconomic fashion sideways with respect to the percussion device. In addition, the motor is placed to the side of the percussion device and requires additional lateral space in that position.

It is an object of the present invention to hold the external measurements of the percussion rock drilling apparatus as small as possible without power losses.

In accordance with the invention there is provided percussion rock drilling apparatus comprising a percussion drilling drive for a drill rod which includes a percussion device and a rotary drive secured to the percussion device and including a motor and a reduction gear and in which a housing of the reduction gear is arranged axially in front of the percussion device in a forward drilling direction and radially within the radially outer contour of a housing of the percussion device and the motor extends in said direction from a forward face of and radially within the radially outer contour of the housing of the reduction gear.

In accordance with the invention the free space present on the forward side of the percussion rock drilling apparatus is used in optimal fashion for the placing there of the motor and, in addition, one avoids using the valuable space to the side of the percussion device housing for the reduction gear. In addition to the motor, and where necessary, a protective cover for the motor can also be arranged on the forward side of the percussion rock drilling apparatus in order to protect the motor from external damage. All these measures do not enlarge the given external measurements of the percussion rock drilling apparatus either in the longitudinal or axial direction or in the transverse or radial direction. Thus, there is created a percussion rock drilling apparatus of unusually compact constructional form.

The invention will now be further described with reference to an exemplary embodiment thereof shown in the accompanying drawings in which: Figure 1 is a plan view of a part of a percussion rock drilling apparatus; and Figure 2 is a cross-section on line II-II in Figure 1.

In accordance with Figure 1 a percussion rock drilling apparatus 10 has a carriage 13 on which a percussion drilling drive 15 for a drill rod 17 is slidable by means of a driving mechanism (not shown), e.g. a chain. The percussion drilling drive 15 includes a percussion device 19 and a rotary device 20 connected to it, the rotary device including a reduction gear 21 and a motor 22.

To the side of the percussion device 19 there are placed one or more pressure reservoirs 25 for the pressure medium driving the percussion device 19.

The carriage 13 includes a support plate 27 at its forward end in which a guide bush 29 for the drill rod 17 is fixed. The drill rod 17 is built of hollow form for the passage of a flushing medium to the working tool (not illustrated) and is slid in a forward drilling direction shown by the arrow 30. Figure 1 shows the percussion rock drilling apparatus 10 in the working position in which the percussion drilling device 15 has reached approximately its furthest forward position.

A guide bush 33 which is movable along the carriage 13 in a known manner is located between the percussion drilling device 15 and the supporting plate 27. Additional ones of such movable guide bushes for the support of the drill rod 7 can be provided.

A housing 35 of the reduction gear 21 is secured with screws 37 to a housing 39 of the percussion device 19 and contains a spur gear 40 driven through the motor 22 and a spur gear 41 in engagement therewith and rotatably driving the drill rod 17.

The motor 22 is secured to the forward side of the housing 35 with screws 43 in such a way that it extends with its longitudinal axis parallel to the drill rod 17 and it makes good use of the dead space lying on the forward side of the percussion drilling device 15.

Figure 2 shows that the drilling motor is arranged laterally of the path of movement of the guide bush 33.

The carriage 13 includes flanges 45 directed upwardly and outwardly which are gripped by sliding shoes 47 of the guide bush 33.

It will be seen from the drawings that the housings of the reduction gear 35 and the motor 22 lie radially wholly within the envelope defined by the radially outer contour of the housing of the percussion device 19.

WHAT WE CLAIM IS: 1. Percussion rock drilling apparatus comprising a percussion drilling drive for a drill rod which includes a percussion device and a rotary drive secured to the percussion device and including a motor and a reduction gear and in which a housing of the reduction gear is arranged axially in front of the percussion device in a forward drilling direction and radially within the radially outer contour of a housing of the percussion device and the motor extends in said direction from a forward face of and radially within the radially outer contour of the housing of the reduction gear.

2. Percussion rock drilling apparatus according to Claim 1 further comprising a carriage on which the percussion drilling drive is slidably mounted in the drilling direction.

3. Percussion rock drilling apparatus substantially as herein described with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. direction shown by the arrow 30. Figure 1 shows the percussion rock drilling apparatus 10 in the working position in which the percussion drilling device 15 has reached approximately its furthest forward position. A guide bush 33 which is movable along the carriage 13 in a known manner is located between the percussion drilling device 15 and the supporting plate 27. Additional ones of such movable guide bushes for the support of the drill rod 7 can be provided. A housing 35 of the reduction gear 21 is secured with screws 37 to a housing 39 of the percussion device 19 and contains a spur gear 40 driven through the motor 22 and a spur gear 41 in engagement therewith and rotatably driving the drill rod 17. The motor 22 is secured to the forward side of the housing 35 with screws 43 in such a way that it extends with its longitudinal axis parallel to the drill rod 17 and it makes good use of the dead space lying on the forward side of the percussion drilling device 15. Figure 2 shows that the drilling motor is arranged laterally of the path of movement of the guide bush 33. The carriage 13 includes flanges 45 directed upwardly and outwardly which are gripped by sliding shoes 47 of the guide bush 33. It will be seen from the drawings that the housings of the reduction gear 35 and the motor 22 lie radially wholly within the envelope defined by the radially outer contour of the housing of the percussion device 19. WHAT WE CLAIM IS:

1. Percussion rock drilling apparatus comprising a percussion drilling drive for a drill rod which includes a percussion device and a rotary drive secured to the percussion device and including a motor and a reduction gear and in which a housing of the reduction gear is arranged axially in front of the percussion device in a forward drilling direction and radially within the radially outer contour of a housing of the percussion device and the motor extends in said direction from a forward face of and radially within the radially outer contour of the housing of the reduction gear.