US1595938A

US1595938A - Cradle for machine tools such as rock drills and the like

Info

Publication number: US1595938A
Application number: US22921A
Authority: US
Inventors: Holman John Leonard; Holman Arthur Treve
Original assignee: Holman Brothers Ltd
Current assignee: Holman Brothers Ltd
Priority date: 1924-05-28
Filing date: 1925-04-13
Publication date: 1926-08-10
Anticipated expiration: 1943-08-10
Also published as: GB230320A

Description

Aug. 10 ,'192e\ 1,595,938 J. L. HOLMAN ET AL CRADLE FOR MACHINE TOOLS SUCH AS ROCK DRILLS AND THE LIKE Filed April 13 l92f -2 Sheets-Sheet 1 J. L. HOLMAN ET AL CRADLE FOR MACHINE TOOLS SUCH AS ROCK DRILLS AND THE LIKE ile p l 15. 1925.- 2 Sheets-Sheet 2 Patented Aug. 10, 1926.

UNITED STATEfi Parana" orricn.

JOHN LEONARD HOLMAN AND AETQEIUB TREVE HOLMAN, OF CAIVIBORNE, ENGLAND, .ASSIGNORS TO HDLMAN BROTHERfi LIMITED, 013 OAMBORNE, ENGLAND, A BRITISH COMPANY.

CRADLE FOR MACHINE TOOLS SUCH AS ROCK DBI'LLS AND THE LIKE.

Application filed April 13, 1925, Serial No.

This invention consists in improvements in or relating to cradles for machine tools such for example as rock drills, pneumatic hammers, riveting machines and the like, the cradles having in or on them one or more slideways in or on which the tool or certain parts thereof may slide bodily. Generally speaking in a rock drill the cradle has within ita lead-screw by which the rock drill is traversed in the cradle so as to keep it up to its work.

It is found that the bearingsurface or surfaces of the slideway or slideways in such cradles are liable to wear and to impair the accuracy with which the tool will slide withr in the cradle. An object of the invention is to provide improved means to overcome this drawback.

It has previously been proposed to accomvmodate for the wear in various ways. According to one proposal the channel member forming the slideway or one of its walls was to be bodily adjustable on the cradle. Also it has been proposed in the case when only a wall of the cradle was adjustable to se-' cure that wall in its adjusted position by means of a bolt extending from it through an elongated slot in an adjacent part of the cradle.

According to one feature of the present invention in orfor a cradle of the type above described having in ita slideway affording two surfaces which are disposed in planes inclined to one another and one of which is intended to support an under-sun face of a member to be received in the said slideway (for example the under-surface of a part of' a rock drill or the like which is supported by the cradle), there is a onepiece liner to 'overli'e said surfaces and to provide the necessary bearing surface upon which the member will slide and means for adjusting the said liner bodily to compensate for wear of the bearing surface.

Both of the surfaces above referred to may be intended as bearing surfaces in which case the liner will provide both such surfaces.

According to another feature of the invention the slideway is of channel form which in addition to the bearing surfaces for the under and lateral parts above referred to pro vide also bearing surfaces in the other walls 22,921, and in Great Britain May 28, 1924.

of thechannel. The two surfaces above described as being disposed in inclined planes will constitute respectively one wall of the channel and a part which extends from and beyond the outer edge of that wall.

Conveniently the adjustment of the liner is effected by the aid of adjusting means cooperating with that portion which faces or bears against a lateral surface of the mem her which is supported in the cradle.

In order that the invention may be more clearly understood a description will now be given, by way of example only, of one preferred construction illustrated in the acconr panying drawings, in which Figure 1 illustrates half in section and half in end elevation a cradle with a liner shown in position in the half which is in section. The section is'taken on the line 11 of Figure 3;

Figure 2 is a side view of a portion of the cradle viewed from the right of Figure 1, and

Figure 3 is a plan of the part shown in Figure 1 showingonly an end portion of the cradle.

Like reference numerals indicate like parts in the several figures of the drawings.

The cradle illustrated is of a known type in which, along each side of the cradle there is a longitudinal channel 10, the walls of which serve as bearing surfaces for a flange or the like extending laterally from the tool to be supported in the cradle. Extending from and beyond the outer edge of-the lower' surfaces 20 of each channel is a wall 11 inclined at an angle to the surface 20 and facing a lateral portion of the tool. At intervals along the length of the wall 11 apertures 12 are formed passing completely through that wall.

The liner hereinhefore referred to comprises for each channel a single piece of lining metal or the like referred to as a whole by the reference numeral 13 and it will be seen that this liner has two inclined portions which overlie the surface 20 and the outer surface of the wall 11 respectively.

.Bolts 14, the heads of which are embedded in that member of the liner overlying the wall 11, extend through each of the apertures 12 and nuts 15 co-operating with the outer ends of the .bolts 14 on the outside of the walls 11 serve to clamp the liners in position. I

The apertures 12 are larger in diameter than the bolts 14 so as to permit the bolts to slide bodily therein and at the same time to enable that portion of the liner 13 which overlies the bottom wall of the channel 10 to be raised or moved towards the opposite wall thereof.

In the lower angle of the channel there is an inclined wall 16, the inclination of which corresponds to that of the wall 11 relatively to the lower wall of the channel and the engaging angle of the liner 13 is correspondingly cham-fered so that as the liner is moved bodily a supporting engagement will always be maintained between the chamfered edge of the liner and the wall 16.

It will thus be seen that as wear occurs in the bearing surfaces of the slideways this wear can be accommodated by adjusting the liners accordingly.

The apertures 12 are not necessarily circular but in cross-section are elongated in the direction of the height of the walls 11. This construction is illustrated in the drawings.

It is obvious that the details of construction may be varied without departing from the spirit of the invention.

What we claim as our invention and desire to secure by Letters Patent is:

1. A machine-tool cradle having a channel formed in an integral part of the cradle for receiving a member constituting part of a machine-tool, which cradle affords two supporting surfaces disposed at an angle to one another for said member, one of which supporting surfaces is constituted by an inner face of said channel, in combination with a one-piece liner overlying said supporting surfaces and providing two bearing surfaces for said member, and means for adjusting said liner bodily to compensate for wear of the bearing surfaces.

2. A machine-tool cradle having a channel slideway formed in an integral lateral part of the cradle for receiving a member constituting part of a machine-tool, which cradle affords two supporting surfaces disposed at an angle to one another for said member, one of which supporting surfaces is constituted by an inner face of said slideway, in combination with a one-piece liner overlying said supporting surfaces and providing two bearing surfaces for said memher, and means for adjusting said liner bodily to compensate for wear of the bearing surfaces.

3. A machine-tool cradle having a channel slideway formed in an integral part of the cradle for receiving a member constituting part of a machine-tool and affording two bearing surfaces whereof one constitutes an inner face of a wall of the channel and the second is on a part which extends from and beyond one outer edge of the channel and at an obtuse angle to the first bearing surface, a one-piece liner for said bearing surfaces, and means to adjust the said liner bodily in relation to the other walls of the channel to compensate for wear of the liner.

4:. A machine-tool cradle having a channel formed in a lateral integral part of the cradle for receiving a member constituting part of a machine-tool, which cradle affords for said member two supporting surfaces that lie in the direction of length of the cradle and are disposed at an angle to one another, one of which supporting surfaces is constituted by an inner face of said chan nel, in combination with a one-piece liner overlying said supporting surfaces and providing two bearing surfaces for said member, and a plurality of bolts extending each through a slot in the wall of the cradle and arranged to adjust said liner bodily to compensate for wear of the bearing surfaces.

5. A machine-tool cradle having a channelslideway formed in an integral lateral part of the cradle for receiving a member constituting part of a machine-tool and affording two bearing surfaces whereof one constitutes an inner face of a wall of the channel and the second is on a part which extends from and beyond one outer edge of the channel and at an obtuse angle to the first bearing surface, a one-piece liner for said bearing surfaces, and a plurality of bolts extending each through a slot in the wall of the cradle and co-acting each with that part of the liner providing the second bearing surface and arranged to adjust said liner bodily to compensate for wear of the bearing surfaces.

6. A machine-tool cradle having a slideway formed in an integral lateral part of the cradle for receiving a member constitutlng part of the machine-tool and affording three supporting surfaces whereof two which are parallel to one another are situated spaced apart one at each side of the third and one above and the other below the third when the latter is horizontal, in combination with a one-piece liner having three faces overlying each one of said supportlng faces and providing two bearing surfaces for said member, and means for adjusting said liner bodily to compensate for wear of the bearing surfaces.

7. For use with a cradle of the character described having a laterally disposed slideway for receiving a member constituting part of a machine-tool, which slideway affords two supporting surfaces disposed at an obtuse angle one to the other, a one-piece liner of obtuse angle shape in cross-section constituting a wearing plate having a flange along one side thereof, which wearing plate and flange are arranged to lie respectlvely on said supporting surfaces and afford two bearing surfaces for slidably receiving said member, substantially as described.

8. For use with a cradle of the character described having a slideway formed on an integral lateral part of the cradle for receiving a member constituting part of a machine-to0l, which slideway extends in the direction of length of the cradle, and affords two supporting surfaces disposed at an obtuse angle one to the other, a one-piece liner of obtuse angle shape in cross-section constituting a wearing plate having a flange along one side thereof, which wearing plate and flange are arranged to lie respectively on said supporting surfaces and afford two bearing surfaces disposed at an obtuse angle one to the other for slidably receiving said member, which wearing plate is chamfered along that free edge thereof which adjoins the side of the plate intended to lie on one of said supporting surfaces, substantially as described.

In testimony whereof, we have signed our names to this specification.

JOHN LEONARD HOLMAN. ARTHUR TREVE HOLMAN.