System for adjusting play in a linear guide

A system for adjusting the play in a linear guide, the linear guide incorporating a slide provided with running surfaces and guided between guide surfaces of a guide element. The linear guide also includes bearing members that are disposed between running surfaces and guide surfaces, with at least one running surface held on the slide elastically displaceable in the cross-direction and adjustable by a spreader element against a guide surface assigned to the running surface. This renders the play between the slide and the guide element adjustable. The spreader element comprises a hollow body that incorporates a continuous through-opening extending in the longitudinal direction and is elastically displaceable or deformable by an adjusting element cooperating with the same.

BACKGROUND OF THE INVENTION

1. Technical Field of the Invention

The present invention relates to a system for adjusting play in a linear guide, said linear guide incorporating a slide provided with running surfaces and guided between guide surfaces of a guide element, also bearing members that are disposed between running and guide surfaces, with at least one running surface held on the slide elastically displaceable in the cross-direction and adjustable by means of a spreader element against a guide surface assigned to the running surface, thus rendering the play between the slide and the guide element adjustable.

2. Object and Summary of the Invention

The object of the invention consists of improving a system in a linear guide in such a way that a spreader element is accessible as easily as possible, thus rendering the play between the slide and guide element adjustable as easily as possible.

This object is met in the system in such a way that the spreader element comprises a hollow body that incorporates a continuous through-opening in the longitudinal direction and is displaceable and/or elastically deformable by means of an adjusting element cooperating with the same.

The hollow body is preferably designed as a cylindrical tubular section.

Provision may be made for an adjusting screw that engages into a threaded bore in the slide to radially act upon an outer circumference surface of the hollow body.

The through-opening is advantageously dimensioned such that it permits in any adjustment position the passage of a drive spindle.

The slide is preferably substantially Y-shaped in its cross-section in the region of the running surfaces, and two leg sections that carry the running surfaces are connected elastically deformable, particularly in one piece, to a web section carrying a base section, and the spreader element is disposed in a cutout between the leg sections.

The adjusting screw is advantageously guided through the web section in such a way that it is accessible from the side of the base section.

Each leg section preferably carries two running surfaces.

The cutout housing the spreader element may have a substantially oval cross-section shape.

In a preferred embodiment, the slide and/or guide element are composed of extruded profiles, particularly of light metal.

The running surfaces and/or guide surfaces may be formed by hardened insert or attachment strips.

The use of recirculating linear ball bearing guides is preferred.

The invention furthermore relates to a linear guide system having a system for adjusting the play according to the invention

The linear guide system shown in FIG. 1 comprises a guide element or guide rail 1 with a substantially U-shaped cross-section and a slide 2 that is slideably run in the guide rail 1 , said guide rail and slide being composed of extruded light-metal profiles.

A linear guidance of the slide 2 along the guide rail 1 that is practically free from play and low-friction is implemented with recirculating linear ball bearing guides in such a way that steel balls 3 are guided between hardened insert strips 4 that are inserted into the guide rail 1 and form guide surfaces, and matching insert strips 5 that are inserted into the slide 2 and form running surfaces. In the discussed example there are altogether four recirculating linear ball bearing guides wherein the balls 3 are deflected at frontal ends of the slide 2 and guided back in guide channels 6 , 7 that extend parallel to the respective running and guide surfaces of the insert strips.

As FIG. 1 further shows, the slide 2 is designed Y-shaped in its region that is encompassed by the guide rail 1 and in the region of the recirculating linear ball guides, respectively, and incorporates two leg sections 2 a , 2 b and a common web section 2 c . Adjoining the web section 2 c is a base section 2 d that serves to hold and fasten components or the like that are to be moved with the slide.

The leg sections 2 a and 2 b encompass a central cutout 10 having a substantially circular and ovally widened cross-section that extends axially and in the direction of movement, which houses in its circular cross-section area a tubular spreader element 11 . The substantially oval cross-section region adjoining the circular cross-section region of the cutout 10 is formed such that a widening of the circular cross-section region is created that tapers in a wedge shape.

An adjusting element, which, in the present embodiment, is formed by an adjusting screw 12 , is screwed in by means of a threaded bore 13 extending through the web section 2 c of the slide and acts upon the outer circumference of the tensioning element 11 .

As is apparent from FIG. 1 , the tubular section 11 is displaced downward inside the cutout 10 and into the oval region of the cutout when the adjusting screw 12 is screwed in further, and simultaneously, depending on its rigidity, ovalized to a greater or lesser degree, so that a spreading effect is generated onto the two leg sections 2 a , 2 b of the slide, through which these and the insert strips 5 that are connected to same are moved apart. This movement is within a range of a few one hundredths or, at the most, one tenths of a millimeter, so that an elastic deformation of the leg sections and spreader element is ensured.

The advantage of the inventive system lies in the fact, among others, that the design of the spreader element in the form of a tubular section leaves a central axial through-opening 15 for a drive spindle 16 or the like and that an adjustment of the play is possible without difficulty from outside, simply by screwing in or out the adjusting screw 12 by means of a tool that is inserted through a bore 18 in the base section 2 d.