US3182427A - Grinding machine for brake drums for wheels - Google Patents

Description

May 11, 1965 sHlGEKlcl-n MIYABAYAsHl 3,182,427

GRINDING MACHINE FOR BRAKE DRUMS FOR WHEELS Filed oct. s, 1962 for/lays United States Patent 3,182,427 GRINDING MACHINE FOR BRAKE DRUMS FOR WHEELS Shigekich Miyabayashi, Chigusa-ku, Nagoya-shi, Aichiken, Japan, assignor to The Nippon Tolri Kaisha Ltd., Nagoya-shi, Aichi-ken, Japan, a corporation of Japan Filed Oct. 8, i1962, Ser. No. 229,069 Claims priority, application Japan, Oct. 26, 1961, 36 38 832 The present invention relates to a grinding machine for performing grinding operation according to the condition of the peripheral surface of a brake drum for wheels which is iixed on a drum grinding device, and is characterized in that an automatic feeding device utilizing a cam mechanism is provided in the bed of the grinding machine for advancing a grinder wheel so that the grinder Wheel will be slowly advanced in grinding operation to perform automatically desired amount of cutting on the peripheral surface of a brake drum.

The present invention will ybe explained concretely with reference to one of the embodiments off the present invention illustrated in the accompanying drawings, in which:

FIG. l is a side view, partly in section, of an apparatus of the present invention, showing essential parts thereof; and

FIG. 2 is a rear view partly in section, of same on a greater scale, showing only a part of the apparatus.

A shaft 2 is horizontally and rotatably mounted on the side wall in a bed 1 and a worm wheel 3 and a grooved cam 4 are keyed on said shaft, the cam being positioned to the right of the Worm wheel. Another sha-ft 7 provided with a worm 5 which engages the lower end of the worm wheel 3 is rotatably mounted on the side wall in the bed 1. The shaft 7 has a pulley 6 fixed on its one end and it is so designed that rotation may be transmitted to the grooved cam 4 through the pulley 6, the worm 5 Iand the wo-rm wheel 3 by a motor Ma placed on the bottom in the bed 1. In this case, the pulley 6, the Worm 5 and the worm wheel 3 are designed to rnake the rotation speed of the grooved cam 4 very low.

In the center of the recess 8 on the top of the bed 1 is fixed a cradle 9 having a guiding surface of dove-tail groove shape, into which a sliding member 11 provided with a screw hole 10 at its center is mounted slidably in the direction of front and back. On the central part of the lower surface of said sliding member 11 is iixed a rotatable guide rol-ler 12 which passes through the top surface of the bed 1 downwardly and vertically and enters the groove of the cam 4. Accordingly the sliding member 11 slides to front and back according to the rotation of the cam 4. On the guiding surface of the bed 1 is mounted a column 13 which is slidable to f-ront and back. A feed screw provided with 4a feed handle 14 lfor feeding to front and back is rotatably mounted in horizontal position by a bearing on the rear lower part of the column 13. The feed screw 15 is inserted into the screw hole 10 of the sliding member 11 and the position of a grinder wheel 16 may be adjusted by screwing the feed screw 15 into the screw hole 10 by the feed handle 14, when the grinder wheel is worn. To the front olf the column 13 is attached a stand 17 which has a grinder wheel 16 and supports on its upper surface a motor Mb for rotating said grinder wheel. This stand can be moved up and down by means of a feed handle 18 for vertical ymotion which is mounted in the rear of the column 13.

In the operation of the present invention, the height of the grinder wheel 16 is adjusted by the operation of the handle 18 for vertical feeding to bring the grinder wheel near the surface of a brake drum D to be worked which comes from the back in a flow on a conveyor (not shown) and is rotating being horizontally fixed on a drum grinding device G. The cam 4 is rotated at greatly reduced speed, by the motor Ma in the bed 1 through the pulley 6, the worm 5 and the worm wheel 3 as described before. Accordingly the guide roller 12 attached to the lower surface of the sliding member 11 shifts the sliding member slowly to front by the rotation of the grooved cam 4. The column 13 connected with the sliding member 11 by the feed screw 15 is moved forwardly by the advancement of the sliding member together with the grinder wheel 16 attached to the front surface of the column. Thus the grinder wheel 16 is automatically advanced to perform cutting operation while the brake drum D is rotated. When the grooved cam 4 rotates to pass the upper dead point, the motion of the sliding member 11 and consequently that of the grinder wheel 16 is reversed to iinish the cutting operation. By adjusting the upper dead point of the grooved cam 4 to required amount of cutting of the brake drum, the required amount of cutting can be automatically attained by one operation. When the grinder wheel 16 has worn and its diameter has become small, the adjustment can be carried out by advancing the column 13 by operating the feed handle 14 for advancement.

In the present invention, the required amount of cutting of the peripheral surface of a brake drum attached on a drum grinding device G can be automatically attained by the use of a cam mechanism. Accordingly it makes it possible to perform the cutting operation of brake drums for wheels which requires mass production by a continuous How operation. It eliminates the risks of the operators which are involved in the case of operation of grinding of individual pieces as before. Furthermore it brings about saving in time and labour. Thus the advantage of the present invention is very great.

I claim:

l. A grinding machine for brake drums for wheels comprising a column on which a grinder wheel and a motor for driving said grinder wheel are attached slidably in a vertical direction, a bed having an upper surface and supporting said column and said column being reciprocably slidable in a horizontal direction on said upper surface, a sliding member mounted on the bed, a feed screw rotatably mounted in a lower part of the column and extending in a horizontal direction and screwed into a screw hole provided in said sliding member, a grooved circular cam rotatably mounted below the sliding member, and a guide roller provided at the bottom of the sliding member and inserted into a groove of said cam.

2. An apparatus for grinding a brake drum comprising a column, a grinding wheel secured to said column, a brake drum support, a housing, the top of which is formed as a grinding bed and supports said column slidably in a horizontal direction, a shaft mounted in the housing substantially parallel to the said horizontal direction, means for rotating said shaft; a cam wheel keyed on said shaft and having a peripheral, endless groove with outlines extending obliquely to the major axis of said shaft; a pin with a guide roller inserted into said groove, said pin being mounted at the bottom of said column and passing through an opening at the top of said housing; a sliding member mounted on the housing and connected with said pin, said sliding member having a thread; a feed screw rotatably mounted lat the bottom of said column and engaging with said thread; the cam wheel during rotation by the driving means moving the grinding wheel towards and away from the brake drum support and the feed screw being adapted to adjust the distance between the grinding wheel and the brake drum support.

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(References on following page) 3 f 4 Y Reim-ences Cited by the Examiner FOREIGN PATENTS UNITED STATES PATENTS Y 448,191 8/27 Germany. 1,952,130 3/34 Harrison et al.

2,325,701 8/43 Murray 51-166 2,384,512 9/ 45 Wiken et a1. 5 I. SPENCEROVERHOLSER, Examiner.

LESTER M. SWINGLE, Primary Examiner.

Claims (1)

1. A GRINDING MACHINE FOR BRAKE DRUMS FOR WHEELS COMPRISING A COLUMN ON WHICH A GRINDER WHEEL AND A MOTOR FOR DRIVING SAID GRINDER WHEEL ARE ATTACHED SLIDABLY IN A VERTICAL DIRECTION, A BED HAVING AN UPPER SURFACE AND SUPPORTING SAID COLUMN AND SAID COLUMN BEING RECIPROCABLY SLIDABLE IN A HORZIZONTAL DIRECTION ON SAID UPPER SURFACE, A SLIDING MEMBER MOUNTED ON THE BED, A FEED SCREW ROTATABLY MOUNTED IN A LOWER PART OF THE COLUMN AND EXTENDING IN A HORIZONTAL DIRECTION AND SCREWED INTO A SCREW HOLE PROVIDED IN SAID SLIDING MEMBER, A GROOVED CIRCULAR CAM ROTATABLY MOUNTED BELOW THE SLIDING MEMBER, AND A GUIDE ROLLER PROVIDED AT THE BOTTOM OF THE SLIDING MEMBER AND INSERTED INTO A GROOVE OF SAID CAM.

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