US1633844A - Release clutch for grinding mills - Google Patents

Description

J. S. BUCKWALTER RELEASE CLUTCH FOR GRINDING MILLS June 28, 1927. 1,633,844

Filed July 1, 1924 2 Sheets-Sheet l June 28, 1927.

1,633,844 J. s. BUCKWALTER RELEASE CLUTCH FOR GRINDING MILLS Filed July 1, 1924 2 Sheets-Shut 2 Patented June 28, 1927.

UNITED STATES 1,633,844 PATENT OFFICE.

JACOB S. BUCKWALTER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE ENTERPRISE MANUFACTURING COMPANY OF PENNSYLVANIA, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

RELEASE CLUTCH FOR GRINDING MILLS.

Application filed July 1,

clogged, by foreign matter passing between the grinding plates.

In the accompanying drawings:

Fig. 1 is a sectional elevation of a grinding mill illustrating my invention;

Fig. 2 is a sectional view on the line 22,

Fig. 1;

Fig. 3 is a detached perspective View of the shaft and the grooved collar thereon;

Fig. 4 is a detached perspective view of the latch; and

Fig. 5 is a detached perspective view of the plunger that engages the latch and holds it vieldingly in position.

eferring to the drawings, 1 is the body of a grinding mill having a hopper 2 and an outlet 3 for the material that has been ground. A fixed grinding disk 4 is secured to the body in any suitable manner. An electric motor 5 is secured to a flange 6 of the body 1. A motor shaft 7 is notched at the end to receive a similarly formed end of a mill shaft 8, which is mounted in a bearing 9 in a cap plate 10 that is secured to the body 1. Secured by a pin 11 to the shaft is a collar 12 having a groove 13, Fig. 3. The walls of this groove are inclined, as shown clearly in the drawings, to allow the latch to be released under excessive pressure.

Mounted loosely on the shaft 8 is a feed screw 14 to which is attached the rotating grinding disk 15 and the carrying disk 16. These two disks are secured to the feed screw by screws17. Extending over the joint between the motor shaft and the mill shaft 8 is a sleeve 18 having a head 19.- Between this head and the end of the feed screw 14 is a spring 20. There is a space 21 between the end of the sleeve and the inner end of the opening in the feed screw so that the feed screw, and its disk, can be adjusted towards and from the fixed grinding disk 4. The spring 20 holds the shaft 8 yieldingly against a ball thrust bearing 22. Mounted on a stud 23 on the disk 16 is a latch 24,

1924'. Serial No. 723,534.

Fig. 4, which has a projection 25 that is adapted to fitthe groove 13 in the collar 12. This projection has beveled sides 26, whichfitthe beveled sides of the groove 13. The bevel is such that, when the grinding disk 15 is clogged, the latch is forced out of the groove. This allows the motor and the mill. shaft to turn freely, independently of the grinding disk. The latch has an we tension 27, which forms a finger hold by which it can be forced into the groove, or manually removed from the groove. A stop 28 on'the disk 16 limits the outward movement of the latch 24.

In order to hold the latch frictionally either in or out of position, a plunger 29 is provided, which is adapted to slide in a projection 30 on the disk 16. Back of this plunger is a spring 31, which bears against a screw 32 in the rear of the projection. The end of the plunger is beveled, as shown in Figs. 2 and 5, and either rests against one of the beveled walls 26 of the projection 25 of the latch, or in the beveled notch 33 in the latch.

When the plunger is in the notch 33, the latch is held in engagement with the collar 12, as shown by full lines in Fig. 2. WVhen the latch is raised, the plunger holds the latch out of engagement. In the presentinstance, the cap plate 10 has an extension 34, in which is mounted a cam disk 35, carrying the ball thrust bearing 22. This caml disk is prevented from turning inthe cap plate. In the present lnstance, 1t has an arm 36, whlch enters a groove in the bearing 9. The back of the cam plate has three cam surfaces, which correspond to three cam surfaces on a. cam block 37 that is secured to a sleeve 38, which is mounted on the extension 34 of the cap plate 10. The screws 39 secure the cam block to the sleeve. On turning the sleeve, the grinding disk 15 can be adjusted towards the fixed disk 4. A pin 40 which is mounted in the sleeve is projected yieldingly by a. spring 41 into one of a series of grooves 42 in the end of the cap plate. The means of adjusting the movable grinding disk forms no part of the present invention. 7

This invention is particularly adapted for grinding material, such as coffee. Occasionally, the mill becomes clogged. The foreign matter enters the space between the disks and unless there is release mechanism, one of the parts is liable to be broken. By providing the latch, as soon as the pressure is in excessof the spring pressure, the latch is forced out of the groove in the collar 12 and the collar, and its shaft, turn independently of the disk. On removing the cap plate 10, the disk can be freed of the obstructions and the latch can be reset.

I claim:

The combination in clutch release mechanism of a. shaft; a collar on the shaft having a transverse groove therein; amovable member mounted on the shaft; a latch pivoted to said member and having a projection extending into the groove in the collar and having a beveled wall in which is a beveled notch, and a spring-pressed plunger mounted on the movable member and having a beveled end arranged to engage the notch in the latch to retain the latch in engagement with the collar, or with the beveled wall to hold the latch out of engagement with the collar.

J ACOB S. BUCKlVi-lLTEl-l.

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