DE139034C - PROTECTIVE DEVICE FOR EMINGER GRINDING WHEELS - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The present modification of the protective device for emery wheels according to the patent The purpose of 119529 is to work on machines that have two or more grinding wheels, but only a drive means (pulley, toothed wheel, etc.) are equipped in the event of any breakage one of the two wheels by means of only one weight triggering BEZW. To bring about decoupling of the drive means. A protective sanding machine built in accordance with the present invention is shown in the accompanying drawing, namely:

Fig. Ι a front view with the length of the machine frame cut through,

Fig. 2 is a side view of the machine and

Fig. 3 is a vertical section along line AB in Fig. I.

In Figs. 4, 5, 6 and 7 details of the machine are shown.

The release respectively. The drive means of the machine is decoupled by releasing a weight ο guided in a frame r and suspended on hook-shaped lever arms m ¹ m ¹ when the sanding disk / protective band e is taken along by it when it jumps and its movement is caused by a shaft m transmits on the lever arms in ¹ m. ¹ If the weight falls on the lower crosspiece r ^{1 of} the frame r serving for guidance, a suitable lever mechanism ss ^{1 is} moved by its displacement, which uncouples the drive means c (pulley or the like).

In the machine frame α , the shaft b is mounted in the usual way. Between the bearings a ¹ a ¹ , the drive means, the stepped pulley c, sits loosely on the shaft b, which is coupled or released by shifting in one sense or the other. The disc c can of course also be stuck on the shaft b , in which case the claw or friction disc d (FIG. 4) is arranged to be displaceable. An emery disk f is firmly seated on each end of the shaft b.

Two shafts mm are supported below shaft b. ^{A hook-shaped arm m 1} m ¹ sits firmly on each inner end of the same. Near the outer ends of the shafts mm are fastened in the same pegs η η. Each pin η is in a catch or a hole in the brake band e, which is attached to the arms i and is provided with the brake shoes k .

The hook-shaped arms m ¹ m ^l are used to hold a cylindrical weight 0, which with two opposing pins o ¹ o ¹ and with an all-round

Claims (4)

the edge ο2 is provided. The pegs O1O1 rest in the hook-like ends of the arms Ot1Ot1. On the weight ο resp. on the rim o2 rests with a pin r2 of the frame r and is held in this way in a raised position (Fig. ι and 3). The pin r2 fastened in the frame r by a screw nut r3 or in some other way is designed at its upper end as a fork r4 and articulated to an angle lever s sl which can be rotated about bolt s2. With its edge o2, the weight is guided in slots in the frame r r1. After it has been triggered, it falls onto the cross bar r1 of the frame, which has the consequence that the same lowers slightly and thereby rotates the lever ss1 about its pivot point s2. The arm s1 moves the drive means o or the friction or Claw disk d and thereby brings one or the other emery disk f to a standstill immediately. The weight 0 is released as follows: As soon as one of the grinding wheels f bursts, the protective tape e is carried along in the direction of rotation of the grinding wheel, as described in patent 119529; The relevant shaft is rotated by the relevant pin η, so that the arm m} fixed on it swings along and releases its pin οl so that the weight 0 can fall. In the case of large grinding wheels, after the belt tension has been removed, the living force stored in the wheel f that has not broken will still work vigorously against the braking effect of the protective belt e. In order to prevent this, in large machines with four bearings, shaft b is divided and coupled with a cross wedge 1. This transverse wedge 1 is guided in a groove 2 corresponding to twice the width of the wedge and connected to the clutch disc d. When a wheel bursts, in addition to the uncoupling of the drive means, a decoupling of the two shaft ends b b is also achieved. Then, while the cracked grinding wheel is braked and held together by the protective tape, the non-cracked grinding wheel can run out freely. In Fig. 4, such a device is shown in front view and partial section. Fig. 5 shows the split shaft b b alone. FIG. 6 shows the type of fastening of the transverse wedge 1 by two pointed screws 3, while FIG. 7 is a section along line C-D in FIG. Patent-A ν Proverbs: 1. Protection device for emery wheels according to the type of patent 119529, characterized in that a weight (0 ) guided in a frame (r) is suspended on two arms (m ^l m ¹ ) connected to the two protective bands (ee), that it is triggered when one of the two grinding wheels (ff) bursts and by hitting the lower cross piece (r ¹ ) of the frame (r) it lowers it, so that a lever mechanism connected to it (ss ^l ) triggers the drive means (c ) causes. 2. Embodiment of the protective device according to claim 1, characterized in that the weight (o) guided with a ring (o ² ) in grooves or slots of the frame (r ) with pins (o ¹ o ¹ ) in hook-shaped arms (ηι ^Λ m ^l ) rests, each of which is stuck on a shaft (m) connected to the brake band (e) by a pin (n). 3. Embodiment of the protective device according to claim 1, characterized in that the weight (0) holds the frame (r), which is supported by a pin (ι ^Λ ) on the wreath (o ² ) , in a raised position. 4. Embodiment of the protective device according to claim 1, characterized in that in machines with four bearings the grinding wheel shaft (b) for each grinding wheel is coupled separately and by a transverse wedge (1) which is triggered at the same time with the claw or friction disk (d) so that the wheel that has not jumped can coast freely. 1 sheet of drawings,