US1951977A

US1951977A - Grinding the treads of wheel rims for rail vehicles and the like

Info

Publication number: US1951977A
Application number: US565629A
Authority: US
Inventors: Hanus Ewald
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-03-13
Filing date: 1931-09-28
Publication date: 1934-03-20
Anticipated expiration: 1951-03-20
Also published as: FR722112A

Description

March 20, 1934. HANUs 1,951,977

GRINDING THE TREADS OF WHEEL RIMS FOR RAIL VEHICLES AND THE LIKE Filed Sept. 28, 1951 2 Sheets-Sheet 1 Fig. 1.

x In ventor March 20, I 34. HANUs 1,951,977

GRINDING THE TREADS OF WHEEL RIMS FOR RAIL VEHICLES AND THE LIKE Filed Sept. 28, 1931 2 Sheets-Sheet 2 face of a cone.

Patented Mar. 20, 1934 umro STATES FATE tries,

E al Haws Be in-H ma Germany Application September 28, 1931, Serial No. 565,629 In Germany March 13, 1931 Cl ims. (01,- 51- 0 The invention relates to grinding the treads of wheelrims for rail and like vehicles, by means of a grindingdisc composed of separate segments. According to the invention these grinding segments, which may be divided or not, are disposed on the rim of the grinding disc in such a manner as to be easily displaceable in the axial directionfand adjusted in proportion as they wear down. With this object, the segments are pro- .videdin addition to the usual locking by means of external transverse wedges, with a central longitudinal bore and with an auxiliary clamping device consisting of a hollow pin (adapted to be driven up) and acting 'on the walls of the bore. In proportion as the segments wear down and are adjusted, spacing members or terminal blocks can be inserted so that the segments can be utilized almost completely, whilst remaining secured on the rim of the disc in the same reliable manner throughout. With this arrangement the inconvenience might arise of the grinding segments breaking away owing to the acute angle they form with the tread, and that it is difficult to grind out with these segments the sweep of the rim.

Another feature of the invention consists, with the object of obviating these drawbacks, in mounting the grinding segments on a disc the axis of which rotates obliquely or at an angle in relation to the axis of the wheel that is to be ground, the several segments being disposed in such a manner that their grinding surfaces coincide with the sur- In such case, the longitudinal axis .of the segments is sloped 'or inclined in the rim of the grinding disc in such a manner that their longitudinal axis intersects the axis of the grinding disc obliquely and-the wheel rim being arranged in position accordinglyethe axis ef the wheel rim at right angles. This method of mounting the segments enables the maximum grinding efliciency to be obtained which is accomplished for example, at a peripheral velocity of 440- metres per second. In comparison with the original arrangement in which a grinding disc operates axially parallel to the wheel, this method of grinding offers the advantage that the effective diameter of the grinding disc remains constant the segments though fitted with thehew fastening devices are still mounted parallel with the axis of the disc.

Figure 2 shows a plan on a larger scale, of the means for securing the segments on the rim of the grinding disc according to Figure l. 50

Figure 3 shows part of the rim of a grinding disc, in which the segments are disposed obliquely in relation to the axis of the grinding disc, their grinding surfaces therefore lying on a conical surface and being shown in the working position in relation to a portion of a wheel rim;

Figure 4 shows a modified embodiment of the means of securing the segment according to Fig ure 1, in partial section through the segment. Figure 5 is a plan of same, and Figured is a 10 section through the head of the segment of a modification of the embodiment according toFigure 3.

In the example, according to Figures 1 and 2, the segments a are in one piece or divided, and ,75 provided with a suitably toughened bore. With 'the aid of an inserted elastic ring at, these segments are slipped over the longitudinally slotted pin 0 and are inserted with this in' the rim' 8 of the grinding disc as shown and secured from'the .30 outside by 'means of the transverse wedgebfin the usual manner. The hollow pin is splayed by means of an inserted taper screw e and the elastic ring dwhich may be screwed onto the pin is thereby pressed into the roughened wall of the 35 bore in the segment a. In the example showri'in Figure 1, the pin is secured to the rim of the grinding disc by means of a screw threadj Whenithe worn segment is to be readjusted, the taper screw e is loosened, the segment is drawn out a littletgo way and a terminal block or spacing piece 9 (Figures 4; and 5) is inserted in the gap 7. The terminal block or spacing piece g is preferably inserted from inside, i.e. pushed in from the centre outwards, so as tobe held in position by can-- trifugal'force. For this purpose, the spacing piece is designed (Figure 5) as a slotted plate g, the slit being passed over the pin c by way of the opening f. If desired, an additional transverse wedge'b could be inserted on the inner side (Figure 5).. Instead of screwing the pin into the rim of the disc directly from the grinding side, as shownin Figure 1, it is preferably to provide it with a round- .ed head 0 ,(Figure 4) at the end by which it is secured, .and to insert it from the rear side into the disc 3 or the cover plate of the rim of the grinding disc, securing it in position by'mi siot the nut i and an interposed ringh' of elastic 'rubher. This method secures the splay pininfan elastically adjustable manner. The holl'owls gq ments a-which may be divided or not--are then inserted from the inside as already described with the aid of a taper screw e and an elastic bush d of rubber or the like, and one or more drawn-in wedges b or 12 The same method of mounting as in Figures 1 and 4 may be employed for securing the segments in the embodiment of the grinding disc 8 according to Figures 3 and 6. This embodiment has the advantage that the longitudinal axes a: of the segments are disposed obliquely in relation to the central axis y of the grinding-disc rim. The grinding face of the segments thus lies on the surface of a cone, and its axis is perpendicular to the axis of the wheel or wheel rim 7" that is to be ground (see Figure 3). In this embodiment, the spacing pieces or terminal blocks can be inserted from inside or outside. With this object, a slot 1 must be provided in the rim of the grinding disc. When a segment is worn, the taper screw e is loosened, the segment is drawn out to a corresponding extent, and a spacing piece is inserted through the slot 7. The spacing pieces may be of equal or unequal height and be employed in accordance with requirements and the wear of the segments. In all embodiments screw e may also be provided with a suitable longitudinally bore to clear out dust and for air-cooling.

I claim:

1. In a grinding device for grinding the treads of wheel rims for rail and like vehicles, a grinding disc, grinding segments arranged on the rim of said grinding disc, at central longitudinal bore in each segment, expansible clamping devices adapted to act on the walls or" said central longitudinal bores and connect the segments to the grinding disc and recesses on the parts of the grinding disc rim carrying the segments, said recesses providing spaces through which spacing members may be inserted in order to obtain a proper distance between the grinding faces of the segments and the adjacent surface of the grinding disc when the segments are worn.

2. In a grinding device for grinding the treads of wheel rims for rail and like vehicles, a grinding disc, divided grinding segments arranged on the rim of said grinding disc, a central longitudinal bore in each segment, expansible clamping devices adapted to act on the walls of said central longitudinal bores and connect the segments to the grinding disc, and recesses on the parts or the grinding disc rim carrying the segments, said recesses providing spaces through which spacing members may be inserted in order to obtain a proper distance between the grinding faces of the segments and the adjacent surface of the grinding disc when the segments are worn.

3. In a grinding device for grinding the treads of wheel rims for rail and like vehicles, a grinding disc, grinding segments arranged on the rim of said grinding disc, at central longitudinal bore in each segment, expansible clamping devices adapted to act on the walls of said central longitudinal bores and connect the segments to the grinding disc, each clamping device comprising a longitudinally slotted hollow pin, which is adapted to be splayed and to be pressed against the wall of the bore in the grinding segment, and recesses on the parts of the grinding disc rim carrying the segments, said recesses providing spaces through which spacing members may be inserted in order to obtain a proper distance between the grinding faces of the segments and the adjacent surface of the grinding disc when the segments are worn.

4. In a grinding device for grinding-the treads of wheel rims for rail and like vehicles, a grinding disc, grinding segments arranged on the rim of said grinding disc, a central longitudinal bore in each segment, expansible clamping devices adapted to act on the walls of said central longitudinal bores and connect the segments to the grinding disc, each clamping device comprising a longitudinally slotted hollow pin, adapted to be driven in and carrying on the outer end an undisplaceable elastic ring which, when the pin is splayed by a screw, presses into the suitable roughened wall of the bore in the grinding segment, and recesses on the parts of the grinding disc rim carrying the segments, said recesses providing spaces through which spacing members may be inserted in order to obtain a proper distance between the grinding faces of the segments and the adjacent surface of the grinding disc when the segments are worn.

5. In a grinding device for grinding the treads of wheel rims for rail and like vehicles, a grinding disc, grinding segments arranged on the rim of said grinding disc, a central longitudinal bore in each segment, expansible clamping devices adapted to act on the walls of said central 1ongitudinal bores and connect the segments to the grinding disc, external transversal wedges for securing the segments in position and recesses on the parts of the grinding disc rim carrying the segments, said recesses providing spaces through which spacing members may be inserted in order to obtain a proper distance between the grinding faces of the segments and the adjacent surface of the grinding disc when the segments are worn.

6. In a grinding device for grinding the treads of wheel rims for rail and like vehicles, a grinding disc, axially adjustable grinding segments arranged on the rim of said grinding disc, a central longitudinal bore in each segment, external transverse wedges for securing said grinding segments in position and an auxiliary expansible clamping device for each grinding segment, each clamping device being adapted to act on the walls of the central longitudinal bore in the appertaining segment and comprising an expansible hollow pin, which has a semi-spherical head and which, on being inserted into the device from the rear, is adapted to secure the grinding segment by the aid of a taper screw screwed in from the front and an undisplaceable elastic ring arranged at the outer end of said hollow pin.

7. In a grinding device for grinding the treads of wheel rims for rail and like vehicles, a grind ing disc, axially adjustable grinding segments arranged on the rim of said grinding disc in such a manner, that their longitudinal axis is obliquely arranged in relation to the axis of the grinding disc and perpendicular in relation to the axis of the wheel, and their grinding faces lying on the surface of a cone.

8. Ina grinding device for grinding the treads of wheel rims for rail and like vehicles, a grinding disc, axially adjustable grinding segments arranged on the rim of said grinding disc and recesses in the rim of said grinding disc adapted to receive spacing members in order to obtain a proper distance between the grinding faces of the segments and the adjacent surface of. the grinding disc when the segments are worn, said spacing members comprising plates, slotted in the shape of a fork on one side, and adapted to be inserted through openings or slots provided on the inner side of the disc rim.

9. In a grinding device for grinding the treads of wheel rims for rail and like vehicles, a grinding disc, axially adjustable grinding segments arranged'on the rim of said grinding disc, a central longitudinal bore in each segment, clamping devices acting on the walls of said central longitudinal bore in the segments, each clamping device comprising a longitudinally slotted hollow pin adapted to be driven in and carrying on the outer end an undisplaceable elastic ring which, when the pin is splayed by a screw, presses into the suitable roughened wall of the bore in the grinding segment, recesses in the disc rim, spacing members adapted to be inserted into said recesses in order to obtain a proper distance between the grinding faces of the segments and the adjacent surface of the grinding disc when the segments are worn, said spacing pieces comprising plates, slotted in the shape of a fork on one side, and openings for receiving said plates provided on the inner side of the disc rim.

10. In a grinding device for grinding the treads of wheel rims for rail and like vehicles, a grinding disc, divided grinding segments arranged on the rim of said grinding disc, a central longitudinal bore in each segment and expansible clamping devices adapted to act on the walls of said bores and to fasten said segments to the grinding disc.

EWALD HANUS.