Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1986-01-08
1987-10-06
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51241A, B24B 700
Patent
active
046973885
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement for grinding planar annular surfaces, especially the sealing surfaces of a valve, comprising a hub disposed rotationally fixed and bearing a planetary disc mounted rotatably on the hub and bearing in turn around its periphery a plurality of grinding heads each having a grinding disc mounted rotatably on its respective grinding head, this planetary disc being effectively connected to a drive shaft by means of which the planetary disc can be caused to rotate relative to the hub, and wherein there are effective connections between the hub and the grinding discs, adapted to cause the grinding discs to rotate relative to their respective grinding heads when the planetary disc is rotated relative to the hub.
Grinding arrangements of this type are used in particular for the final grinding of the sealing surfaces of valves. In the two main types of valve which exist, namely, shut-off valves and slide valves, the said surfaces are broadly speaking at right angles to the longitudinal extent of the valve spindle, or form a small angle with it. This has meant that for the final grinding of these two kinds of valve two different kinds of grinding arrangement have been required, which is naturally expensive and impractical, particularly as the final grinding is usually carried out on site by special assembly personnel.
A primary object of the present invention is to provide a grinding arrangement of the kind named in the introduction which is for general use, at least for the most usual kinds of valve, and this is made possible due to the fact that the drive shaft is mounted in the centre of the hub in such a way that it can be pivoted through approximately 180.degree. in a plane normal to the planetary disc, thus enabling the grinding discs to coincide with the planar annular surfaces automatically and irrespective of the inclination of the drive shaft relative to the said planar annular surfaces.
The invention will be described in more detail in the following with reference to the accompanying drawing on which
FIGS. 1a and 1b show a grinding arrangement according to the invention being used for the final grinding of sealing surfaces on a slide valve and on a shutoff valve, respectively.
FIG. 2 is a side view showing an embodiment of a grinding arrangement according to the invention during the grinding of the sliding component of a valve.
FIG. 3 is a detail showing the construction of the grinding arrangement shown in FIG. 2, in perspective and at an angle from above.
FIG. 4 is a cross-section through the grinding arrangement.
In FIGS. 1 and 2 on the drawing, 1 is the designation of a grinding arrangement according to the invention which is mounted on a framework 2 via a tubular element 3 in which the drive shaft 4 of the grinding arrangement is rotatably mounted. This shaft may be driven by means of a hand-drill tool 5, operated by electricity or compressed air, which can be effectively connected to the outer end of the drive shaft 4. Via the framework 2 the grinding arrangement can be mounted on a valve housing 6 for the final grinding of the valve seat 6, FIGS. 1a and 1b, or on a cone cradle 7 for the final grinding of the cone or sliding component 8 of the valve, FIG. 2. The purpose of the cone cradle 7 is to serve as a support for the sliding component 8 of the valve and for the framework 2. The latter comprises a mechanism 9 for centering and adjusting the depth of the grinding arrangement, together with stop devices 10 and 11 respectively for the centering and depth-adjustment. The setting of the appropriate grinding pressure is effected by means of a wheel 12 and a spindle 13 with a thread on it, and a pushing and pulling spring 14.
The grinding arrangement comprises a hub 15 which bears a planetary disc 16 mounted so that it can rotate on the hub. Around its periphery the disc has a plurality of grinding heads 17; in the embodiment shown on the drawing the number of grinding heads is five. Each grinding head 17 comprises a part 18 which is mounted so that it may
REFERENCES:
patent: 771194 (1904-09-01), Williams
patent: 2023572 (1935-12-01), Brendel
patent: 2649669 (1953-08-01), Tobis
patent: 2674069 (1954-04-01), Bauer
Lars-Inge Larsson med Firma Larssons Industrimekaniska Verkstad
Rachuba Maurina
Schmidt Frederick R.
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