Patent Application
20190337118
The present invention relates generally to a tow piece spindle grinder fixture adapted to hold a part for grinding.
A work holder adapted to be secured to a work bed of a grinding machine etc., with an indexing workpiece holder adapted to hold a workpiece in a predetermined orientation relative to a machine tool such as a grinder. A base for mounting a fixture relative to the bed of the machine. A housing is pivotally mounted ‘on the base with means for releasably locking the housing in any one of a plurality of angular positions relative to the ‘base. A chuck end extending longitudinally from the frame front and a handle end extending from the frame on the back side. The two piece spindle having a locking ring provided with circular row of equi-spaced axial openings adapted to receive a locking pin to hold the Two Piece spindle in a predetermined orientation. The two piece spindle rotatable relative to the frame. A retainer pin having a spring-loaded orientation for radial extension to seat within one of the openings in the locking ring.
The inventor has come to realize from his experience that the size of the work-piece is limited by the spindle aperture size on the grinding fixture. The spindle size is relative to the size of the base supporting the spindle. Therefore in the prior art large work-pieces required a large fixture. The two piece spindle grinder fixture is a novel part holding invention having a two piece spindle mounted on a base adapted to hold a part in a predetermined orientation. The part may be a work-piece or tool depending on the application. The two piece spindle grinder fixture reduces the base size required to hold relatively larger parts.
A primary object of the two piece spindle grinder fixture is to provide a fixture adapted to hold a relatively large part while reducing the size of the frame.
Another object of the two piece spindle grinder fixture is to provide an adjustable angle indicator on the fixture to adapt the measurement to the orientation of the part.
Another object hereof is to improve upon prior art indexing work-piece or tool holding devices of this type by reducing the number of component parts and the overall size, specifically forming the bearing using the frame and two piece spindle as a bearing race.
Another object of the invention is to maximize the spindle aperture size relative to the frame size.
Another object of the two piece spindle grinder fixture is to allow the use of standard chucks and work-piece holders and ball bearings for utilization in the rotary or fixed grinding of shapes such as tapers, simple and compound angles, cam lobes and forms, and the like.
The two piece spindle grinder fixture may comprise a two piece spindle having a front portion and a back portion joined together concentrically within a frame aperture in a frame. The frame may have a bearing V-groove formed in the frame aperture wall. The frame may have a front shoulder between the V-groove and the front and a back shoulder between the V-groove and the back. The front and back shoulder assist in assembly and limit travel through the frame aperture. The frame aperture having a inner wall concentric about an axis with a stepped interior formed by the front shoulder and back shoulder. Each of the front portion and the back portion may have an frame end. Each of the front portion and back portion may have a complementary bearing surface on their respective frame end. When assembled having the frame ends may be disposed in the frame aperture having the bearing V-groove, front portion bearing surface and back portion bearing surface form a bearing race with the V-groove forming the outer race and the front portion bearing surface joined to the back portion bearing surface forming the inner race. Bearings in the race provide a reduced friction interface between spindle and the frame.
The front portion may have a front body, the front body comprises a front chuck end, a front frame end and an open front spindle interior, the open front spindle interior extending from the front chuck end to the front frame end, Likewise, the back portion may have a back body comprising a back handle end, a back frame end and a back spindle interior, the back spindle interior extending from the back handle end to the back frame end.
The front spindle portion attaches to the back spindle portion having the front spindle interior concentric with the back spindle interior forming the two piece spindle. A chuck or fixture clamp may he disposed on chuck end. A handle may be attached to the handle end. Pressure on the handle urges the twop piece spindle to rotate in the frame aperture about the axis to position a part in the chuck to a desired position for interface with a grinder, or other processing device for grinding of tapers, simple and compound angles, cam lobes and forms, and the like.
The above description sets forth, rather broadly, the more important features of the present invention so that the detailed description of the preferred embodiment that follows may be better understood and contributions of the present invention to the art may be better appreciated. There are, of course, additional features of the invention that will be described below and will form the subject matter of claims. In this respect, before explaining at least one preferred embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of the construction and to the arrangement of the components set forth in the following description or as illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings, which form a part of this application. The drawings show, by way of illustration, specific embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention. (It is to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting.
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In use, a front portion 3 is placed on a flat surface having the axis of the aperture approximately vertical. The frame 1 is set on top of the front portion 3 having having outer race 35 adjacent front bearing surface 26. Bearings 28 may be disposed in outer race 35 and held by gravity as back portion 2 is inserted into the frame aperture and attached to front portion 3. Bearings 28 are retained in race 38.
Although the description above contains many specifications, these should not be construed as limiting the scope of the invention but as merely providing illustrations of some of the embodiments of this invention. Thus, the scope of the invention should be determined by the appended claims and their legal equivalents rather than by the examples given. Further, the present invention has been shown and described with reference to the foregoing exemplary embodiments. It is to be understood, however, that other forms, details, and embodiments may be made without departing from the spirit and scope of the invention which is defined in the following claims.
