USRE18254E - Safety guaed foe - Google Patents

Description

T. A. BRYSON SAFETY GUARD FOR GENTRIFUGAL MACHINES Nov. 24, 1931. Re. 18,254

Original Fil ed April 10, 1925 3 Sheets-Sheet 1 .IN VEN TOR I A2TORNEY 'r. A. BRYSON Nov. 24, 1931.

IN VEN TOR A TTORNE Y T A. BRYSON SAFETY GUARD FOR CENTRIFUGAL MACHINES Original Filed April 10, 1923 3 Sheets-Sheer 3 ltf Reissued Nov; 24, 1931 UNITED STATES. PATENT OFFICE TANDY A. BRYSON, or 'rnoy, NEW YORK, ASSIGNOR To T'OLHURST. MACHINE WORKS, A.

CORPORATION 01:! NEW YGRK SAFETY GUARD FOR CENTRIFUGAL MACHINES Original No. 1,649,947, dated November 22, 1927, Serial No. 631,063,!110311 April 10, 1923. Application for reissue filed August 22,1929. Serial No. 387,774.

The invention relates to: safety guards for centrifugal machines, and more particularly to a novel and greatly improved form of such guards which automatically preventsherein and constituting a part hereof, il-

lustrate one embodiment of the invention, and together with the description, serve to explain the principles of the invention.

("If the drawings Fig. 1 is a top plan, with parts in section of a mechanism embodying the invention;

Fig. 2 is a side elevation looking at Fig. 1 from the left;

Fig. 3 is a, detached detail of the hinges of the basket closure;

Fig. 4 is a fragmentary vertical section, greatly enlarged. taken substantially on line 4-4 of'Fig. 1, looking in the direction of the arrows;

Fig. 5 is a horizontal section, taken substantially on line 5-5 of Fig. 4, looking in the direction of the arrows;

Figs. 6, 7 and 8 are fragmentary views, showing different positions of the safety device and control. for the basket driving mechanism;

9 is a vertical central section of a modified form of the basket closure locking and releasing device; and

Fig. 10 is a l ke view of another modified form of said device.

The invention is directed to provid ng a novel and useful safety guard for centrifual machines, Which will necessarily compel the complete closure of the basket closure or lid before the power can be applied to start the; basket. rotating, and also will eifectively prevent the opening of the basket lid or closure before the basket has come completely to rest. In realizing this general object, theinven tion provides locking means for the basket, lid or closure which are movable by an operative to perm-it the; opening of the lid or, closure,-after the basket has come to: rest, but. which returns automatically and immediate ly to locking position as soon as released by the operative after the opening of the lid orclosure. In cooperation and conjunction therewith a mechanism is provided whereby the power may be turned on to rotate the basket only when the basket lid or closure is in the closedand locked position, this means being controlled directly from the basket closure k j Referring now by way of example to the present preferred embodiment of the; invention, illustrated by way of example in the accompanying drawings, a centrifugal machine of a substantially standard type or form is shown having a casing 1 within which is the usual basket (not shown). The basket is supported by and rotated by the shaft 2, which shaft is driven in a suitable manner, as by a pulley 3 fast on the shaft. over which pulley runs a driving belt 4:. This shaft is carried in bearingsmounted upon the upper art o upright frame pieces 5 and 6, the bases if and 8 of which. respectively, are bolted to and supported by the top portion 9 of the casing 1. A standard 10 islikewise fixed to the top of the casing and extends upwardly to support the shaft bearing and also the belt pulleys and other parts. The upper parts of these supports are broken away as they con stitute per so no part of the present invert tion. This construction so far described is a well-known tvpe of construction and need not lie-described in further detail.

The embodied form of safety lid or closure comprises two lids or halves 21 and 22, the lid :2]. being hinged at 23 and 24, and turning up and down on an axis passing through these hinges, the hinges being mounted either directly or indirectly upon the topof the V casing. In like manner the lid member 22 detent hooks 29. This form of casing closure is the same as, or substantially similarto, that shown in my Patent No. 1,160,373 dated November 16, 1915,although the invention in its broader aspects is applicable to, other forms of centrifugal casings or basket closures, and the present embodiment will not be'regarded as restrictive of the invention. Referring now in detail to the embodied form of the lid or closure locking devices (Figs. 1 to 5), a sleeve 34 fits closely about the shaft 2 at the level of the top of the casing and somewhat thereabove. This sleeve is fixed to the shaft 2 to rotate therewith in a suitable manner as by clamping screws 35 which are screw-threaded into the sleeve 34 and engage the shaft 2. A stop collar 36 is also preferably employed at the top of the sleeve, and this is likewise held in position in suitable manner by the screw 35.

Loosely encircling the fixed sleeve 34 is a locking ring 37, which is slidable longitudinally of the sleeve. A flange 33 on sleeve 34 is a bottom stop for ring 37 This ring has on its bottom portion an outwardly and downwardlyextending conical skirt 38, beneath the bottom edge of which a cooperating locking member, or members. on the casing 'lid or closureengagesto lock the lid in closed position, On its inner surface, which is in slidinglengagement with the sleeve 34, the l ocking ring 37 is provided with a helical groove 40.0f relatively very great pitch, and this groove preferably terminates at its upper end in a locking notch 41. A pin 42 is fixed in the sleeve 34 and works in the groove 40. As a matter of convenience, the locking ring 37 is preferably provided with both a right-hand groove 40 and a left-hand groove 40, and the pin 42 may be positioned in'either groove dependent upon the direction in which the basket and its shaft 2 are to be rotated.

'Mounted on each of the casing lids or closures 21 and 22 are suitable cooperating locking means, and as shown, a spring latch 60,

having a beveled nose" 61, is longitudinally reciprocably, mounted in an aperture in the front end of a casing 62 fastened to, and mounted'upon, the upper surface of the'corresponding lids 21 and 22.' The latch 60 has extending from the rearward end thereof'a cylindrical pin 64, which is also longitudinally reciprocably supported in an opening in the rear wall of the casing 62. A helical spring 65 is in compression between the rear 38and thus be locked, the pin 42 in the re- 'cess'41 preventing the upward motion of the lockingring 37.

The manner of operation of the mechanism just described is substantially as follows The mechanism maybe regarded as in the full line position of Fig. 4, and the operative releases the lids 21 and 22 from their spring catches 29, and as they drop down, the latches 60 will lock the lids beneath the skirt, 38' of the locking ring as just described, and the pin 42 will hold the locking ring in its posi.-. tion; The closing of the lids will permit the turning on of the power and the rotation of the basket and its shaft 2 by mechanism and in a manner which will be later described.

"After the drying or other vcentrifugal separating action is completed, it will be impossible for an operator to grasp the locking ring 37 and raise it to the broken line position of Fig. 4 (thereby to release and permit the opening of the lids 21 and 22) until the shaft 2 has absolutely come to rest. That helical groove 40 in the locking ring is used so that the locking ring must turn in the direction of rotation of the shaft 2 when it is raised from locking to unlocking position. When the basket shaft 21is 'moving,'any friction on the locking ring 37 caused by an operative grasping the-locking ring tendsto causethe loo ing ring to rotate backwardly relatively to the basket shaft 2, and the direction or position of the groove 40 causes a compelling downward pressure on the ring 37, whereby it is firmly held down. Practical tests have shown it to be impossible to turn the locking ring in thedirection of rotation of shaft 2 and at the same time to lift the ring, even when the shaft is rotating exceedingly slowly and is about to come to rest. 1 I

The pitch or inclination of the groove 40, while suflicient to prevent the locking ring being raised until shaft 2 has come absolutely to rest,is sufficiently steep to permit the looking ring to drop back of its own weight to locking position, that is, from the broken line position to the solid line position of Fig. 2.. The acquired inertia at the endof the drop is sufiicient to rotate the locking ring and bring the pin 42 into the locking groove or pocket 41, so that the locking ring may not again be lifted on the shaft without at the same time rotating it, which can only be done when the shaft is at rest.

In Fig. 9 a modified form of the locking mechanism is'shown wherein a sleeve 70 is fixed on the'shaft 2, this sleeve having a heavy helical groove or screw-thread 72 formed on the exteriorisur-face "thereof. A stop edl'lar end -0f-'the path of travel of the locking-device. The locking device in'thiscase consists of a cylinder '75, surrounding loosely the sleeve 70, the cylinder having an enlarged hollow lower portion 7'6, the flat bottom face of which constitutes the latch eng-aging surface or device. A pawl '78 is withintheenlarged lower portion 760 f the "cylinder or casing 75, t'h'epa-wl being pivotally supported at '7 9 and acted upon by a spring '80, which impels it inwardly toward the shaftQ. The

upper endof the pawlconstitutes 'a-squ'are face 81 and the underside of the pawl consti- "tutes a bevel face 82. Spring pressed latche's 60 carried by theclosure snap under the lower edge of portion 76 for holding the cover closed.

This mechanism operates in substantially the same manner as that of Fig. 4. That is,

the groove or thread 01:72 is inclined so that by reason of the frictional engagement of the square end 81 of pawl 78therewith, it "is necessary to rotate the locking 'member'75 in the direction-of rotation of the shaft 2 to raise the locking member from the locking position of Fig. 9. VVh'en the operative grasps the locking member 75, if shaft 2 is rotating even slightly, the screw-thread thrusts the head 81 of the pawl downwardly and holds, or impelsthe member7'5 to locking thread 72 on sleeve '70. and the pawl is cammed backwardly, that is, radially eutwardly against the spring 80. The locking member 75 will immediately-drop to the looking position of Fig. 9,whereu pon the paWl7'8 will snap inwardly radially and its square head. 81 will lock beneath the screwthread 7-2 of the sleeve '70.

InFig. 10 another modified form of the loekingmechanism is shown, wherein a collar is fixed to the shaft 2 to rotate therewith by suitable means, such as a clamping screw 91. A pin 92 is fixed in the sleeve 90 and projects outwardly "into slot 93 in a cylinder 94, which cylinder loosely encircles the sleeve 90. Thereby the cylinder 9% must rotate with the sleeve but is longitudinally slidable along the sleeve andtheref'ore along the shaft The cylinder "94 at its bottom end terminates in a horizontal annular flange 95,, and an enlarged cylinder "96 fits about the circular periphery of the flange 95 and is fixed thereto by suitable means, such as pins or screws 97. The cylinder 96 at its bottom end terminates in a fiat circular head 98, beneath which the spring latches 60, mounted on the lids 21 and 22are adapted to engage to look the lids in closed position. a

Mounted within the cylinder 96 are one or more, preferably'a't 'lea'sttwo, centrifugal- 1y operating locking dete'nts. As embodied, a. detent member 100 has a horizontally-extending end 101, adapted to move into and out of locking engagement helow'the lower end of the sleeve 90 by centrifugal action. This locking member is pivotally'co'nnec'ted at 102 upoiifa supporting bracket 103,;extending downwardly from the bottom face of the flange member '95.

Fixed to, or integral with, the locking member 100 is a downwardlyextending tail 104, terminating preferably in a Weight 10 5. When the lids 21 and 22 are closed, their locking latches 60 will snap into locking position beneath the lower head 98 of the cylinder 96. As soon as the shaft 2 begins rotating, centrifugal action will move the fingers 101 inwardly immediately into locking engagement beneath the lower end of the sleeve 90. The parts are so proportioned that the veryslowest rotatory motion of shaft .2, due to centrifugal action, will immediate- 1y cause this locking engagement.

When shaft 2 comes completely to rest,

the fingers 101 are just clear of the botto'ln of the fixed sleeve 90, and the locking device may he slid longitudinally upwardly up along the shaft, the pin sliding in the groove '93." After the lids 21 and 22 are lift ed, the locking device will immediately and automatically again dropto locking position as soon as the operative "lets go thereof. It will be understood that these modified forms are likewise illustrative and explanatory of the invention, and that other forms may be devised Within the scope of the appended claims. 7

The present preferred embodiment of cooperating means for preventing the power being turnedon and the basket started into rotation before the lids are "closed, is shown applied to an ordinarybelt shifter, although it will be understood that it is likewise appli cable to other forms of power control, such as the starting hoxjfor an electric motor or otherp'ow'er device. 'As' embodied, a rod 112 is longitudinally slidable in a suitable. support, here shownns theweh 113, "which is a part of the bearing support 5 alreaty described, the red being slidable to and fro in an aperture or slot 114 in the web.

end into a: at'plate115,-havingin its bottom edge'two locking notches 116 and 117, adapted to fit over the flange 113 at the bottom o'f tlre slot 114 to hold the rod 112 firmly in The rod 112 is r'e'ferably formed at its forward embodied form, comprises adevice movable by and with the lids 21'and '22, 'As so embodied, a bail 122is fixed at either end to a rod 123, which rod is journaled in lugs 124 and 125, which are mounted on the casing. Rod l23extends outwardly and at its outer end is mounted in a bearing 125. Fixed to this rod is a. crank arm 126, to which is pivoted at its free end 127, a rod 128 terminating at its front end in a fiatp'late-129, which,

, likewise is reciprocable in the-slot 114. The plate 129 is provided with high parts or projections 130 and 131 at its ends with a low part 132 therebetween. I

In the operation of this device, the operating rod 112 for the driving power for the basket may be regarded asin the power-off position, with the notch 117 resting over the flange 114, as it was necessary that the rod 112 be moved in this position before the locking device on the shaft 2 could be moved to permit the raising of the lids 21 or 22. By raising either lid, thebail 122 is rocked upwardly, and thereby the crank arm 126 is rocked to the left in Fig. 6, and the projection 131 is alined in the aperture 114, thereby locking the power controlling rod 112 in the power-off position. These parts must remain in this position so long as either lid is unclosed.

When both lids 21 and 22 are closed, the

bail 122 drops therewith to the position I shown in Fig. 7, and the bailis sufiiciently heavy to rock the arm 126 tothe right, and the depression 132 is thereby brought into line with the slot 114. This permits the rod 112 to be lifted from the position of Fig, 7 and moved to that of Fig. 8, whenthe recess 116 stops the rod in the power-on position. While the rod 112 may now be manipulated at will to turn on and off the power, it .will

be recalled that the latches have locked the lids 21 and 22 in'closed position and they may not be released until the basket and its shaft 2 have come to a full stop. If either lid be lifted, the rod 112 is thereby locked in the power-off position. j J

As stated, the foregoing mechanism is shown exemplarily applied to abelt shifter, wherein a driving belt- 134 is driven in a suitab e manner,'as, fromthe counter shaft or otherwise, and isrmovable between the ,fast and'loose pulleys 135 and 136 on shaft 137. Fixed on shaft 137 also is a pulley 138 over which runs the basket driving belt 4. Shaft 137 is journaled in-bearing blocks 139 and 140. A belt shifter141 is attached to a longitudinally reciprocable rod 142. mounted recinrocably at one end in, a bearing 143 and.

at its other end144, fixed to the shaft 112.

One of the advantages of my invention is that the operator may turn the basket freely by hand to facilitate loading and unloading without danger of having the guard or lid thrown down on his hand, which is adanger therefrom within the scope of the accompanying claims without departing fromthe principles of the invention and without sacrificing its chief advantages, j

What I claim is V 1. A safety device for centrifugal machines including in combination a basket, a closure therefor, meansoperating automatically by closing the closure tolock it in closed position, and meansat the center of the basket movable to permit the unlocking of the :closure onlywhen the basket is at rest and returning automatically to closure-locking position after its closure-unlocking movement.

2. A safety device for centrifugal machines including in combination a basket, a closure therefor, means operating automaticallyby closing the closure to lock it in closed position. and means cooperating with the shaftof the basket movable to permit unlockingof the closure only when the basket is at rest and returning automatically to locking position immediately after such movement, basket rotating means and means preventing said means rotating the basket until the closure is closed.

3. A safety device for centrifugal machines including in combination a basket, a closure therefor, inter-engaging means partly on the closure and partly on the basket shaft, operat ng automatically by closing the closure to lock it in closed position and means preventing the unlocking of the closure until the basket is at rest.

' 4. A safety device for centrifugal machines including in combination a basket. a closure therefor, means operating automatically by closing the closure to lock it in closed position and means cooperating with. the shaft of the basket movable to permit the unlocking'of the closure only when the basket is at rest, and returning automatically-to locking position after said closure is unlocked. basket rotating means and means controlled b the closurefor preventing said means rotating the closure until the closure is closed.

-5. A safetv device for centrifugal machines including in combination a basket, a closure therefor, means operating automatically by closing the closure to lockit in closed position, cooperating means carried partly by the closure and partly by the'basket shaft preventing the unlocking of said closure until the basket is at rest, said means carried by the basket shaft being movable to unlock said closure only when the basket is at rest and returning automatically to closure-locking position after its closure-unlocking-movement, basket rotating means, and means opcrating to prevent rotation of the basket by said rotating means when the closure is not in basket-closing position.

6. A safety device for centrifugal Inachines including in combination a basket and its shaft, a basket closure, a safety device on the shaft normally in locking position and a locking device on the closure automatically locking with said safety device by closing the closure.

7. A safety device for centrifugal machines including in combination a basket and its shaft, a basket closure, a safety device on the shaft, movable to unlocking position and returning immediately to locking position and a locking device on the closure automatically looking with said safety device by closing the closure.

8. A safety device for centrifugal machines includmg in combination a basket and its shaft, a basket closure, a safety device on the shaft, movable to unlocking position and returning automatically and immediately to locking position and a locking device on the closure automatically locking with said safety device by closing the. closure.

9. A safety device for centrifugal machines including in combination a basket and its closure, a safety device cooperating with the basket shaft and maintained in locking position by the rotation ofthe basket, but movable to unlock, the closure only when the basket comes to rest and returning immedi-- ately to locking position after the closure has been unlocked. preparatory to locking the closure again as soon, as it is closed.

10. A safety device for centrifu al machines including in combination a ba ket and its closure, a safety device carried partly b p the closure and partly by the basket shaft and maintained in locking position by the rotation of the basket, but movable to unlock the closure only when the basket comes to rest and returning automatically and immediately to locking position as soon as said closure has been unlocked preparatory to locking the closure again as soon as it is closed.

11. A safety device for centrifugal machines including in combination a basket and its shaft, a basket closure, a safety device comprising a locking member slidable along the shaft and means interengagin with the shaft for compelling rotation of the lockin member relatively to the shaft as it slides thercalong, and means on the closure engagin with said locking member.

l2. A safety device for centrifugal machines including in combination a basket and its shaft, a basket closure, a locking sleeve slidable along the shaft, and having a helical groove therein, and, a pin fixed to the shaft and working in the groove.

13. A safety device for centrifugal. mar chines including in combination a basket and its: shaft, a basket closure, a locking sleeve slida'ble along the shaft, and having a' helical groovetherein and a pin fixed to the shaftand working in the groove and a spring latch on the closure engaging automatically with the sleeve.

14, A safety device for centrifugal machines including incombination a basket and its shaft, a basket closure, a locking sleeveslidable along the shaft, and havin'g'a helical groove therein and a pin fixed to the shaft and working in the groove anda yielding device on the closure engaging automatically with the sleeve.

15. A safety device for centrifugal machines including in combination a basket and its shaft, a basket closure, a locking sleeve slidable along the shaft, and havinga helical groove therein and a pin fixed to the shaft and working in the groove, the roove being formed to cause thepin to loc the sleeve in, looking position. v

16. A safety device for centrifugal machines including in combination a basket and its shaft, a basket closure, a locking sleeve slidable along the shaft, and having ahelical groove therein and a pin fixed to the shaft and worl'iing in thegroove, the groove being formed at one end thereof-to cause the pin to lock the sleeve in locking position. i

1?. A safety device for centrifugal ma chines including combination a basket, a closure therefor, means operating automatically by closing the closure to lock it in closed position, means cooperating with the basket shaft for preventing the unlocking of the closure until the basket is at rest, and movable to unlock said closure only when the basket y is at rest and returning immediately after such movement to closure-locking position and means, preventing the application of power to the basket until the closure is closed.

18. A safety device for centrifugal machines including in combination a basket, a closure therefor, means operating automatically by closing the closure to lock it in closed position, means carried partly by the closure and partly by the basket shaft for preventing the unlocking of the closure until the basket is at rest, and movable to unlock said closure only when the basket is at rest and returning immediately after such movement to closure? locking position and means preventing the g application of power to the basket until the closure is closed, but not interfering with the rotation of the basket manually by an operative.

19. A, centrifugal, machine including in combination a basket and shaft, a basket closure, Safety closure means comprising a device on the shaft normally in locking position and movable to unlocking position. by rota-- tion relatively to the shaft in'the direction. of rotation of the shaft.

20.. A centrifugal machinev including in combination a basket and shaft, a basket clo-' sure, a safety closure means comprising a device on the shaft, movable to unlockingposi tion b rotation relatively to the shaft in the direction of rotation of the shaft.

' 21. A centrifugal machine including in combination a basket. and shaft, a basket closure, safety closure means comprising a device on the shaftand movable to unlocking 6 position by rotation relatively'to the shaft in thedirection of rotation of the shaft, and a device on the closure automatically interlocking with said device on the shaft.

, 22. A centrifugal machine including in combination a basket and shaft, a basket closure, safety closure means comprising. a device on the shaft normally in locking position and movable to unlocking position by ro- V tationrelatively to the shaft in the direction 3 locked.

of rotation of the shaft, a device on the closure automatically interlocking with said device on the shaft, and means operable to start the machine only after said devices are inter- 23. A centrifugal extractor including in combination a basket, a driving shaft, a basket cover, locking means for the cover including a member driven by the shaft and a member controlled bythe cover, the coverbeing unlocked by rotating one of said members relatively to theshaftand in the same direction as the shaft drives, and means for preventing the basket starting until the cover is locked.

' 24. A centrifugal extractorincluding in combination a basket, a driving shaft, a basket cover, locking means for, the cover including a member rotating with the shaft and a a member controlled by the cover, the cover being unlocked by rotating, said rotating member relatively to the shaft and in the same directionas the shaft drives, and means for preventing the basket starting until the cover is locked.

25. A centrifugal extractor including in combination a basket, adriving shaft-,a basket cover, locking. means for the cover including a member rotating with the shaft and a movable longitudinally thereof and a member controlled by the cover, the cover being unlocked by rotating said rotating memberrelatively to the shaftvand in the direction in which the shaft drives to move it longitudi- I nally of the shaft, and means for preventing the basket starting until the cover is locked.

26. 'A centrifugal extractor including in combination a basket, a driving shaft, a safety cover, a safety lock including a member movable with the cover and a member concentric with and rotating with the shaft and being rotatable in the same direction relativelyftheretoand controlling said first mentioned movable member.

27. A centrifugal extractor including in combination a basket, a driving shaft, a

ideal;

safety cover, a safety lock including amember movable with the cover and a. member mounted upon and longitudinally movable 011 and rotating with the shaft and being rotatable in the same direction relatively thereto and controll ng said first mentioned movable member.

28. A centrifugal extractor including in combination a basket, a driving shaft, a safety cover, a safety lock including a'mem ber movable with the cover and a member ro-. tating with the shaft and longitudinally movable thereon and being rotatable in the same direction relatively thereto for preventing the opening of the cover as long as the shaft continues to rotate.

29. A centrifugal extractor including in combination a basket, a driving shaft, a safety cover, a safety lock including a member movable with the cover and a member mounted upon concentric with and longitudinally movable on the shaft and rotating with itand' being rotatable in the same directionrelati'vely thereto and controlling said i first mentioned movable'member. Y

30. A centrifugal extractor including in combination a basket, a driving shaft, a saIety cover, a safety lock including a member movable with the cover and a member rotating with the shaft and being rotatable in the same direction relatively thereto to pass out of the path of said first-mentioned member.

31. A centrifugal extractorincluding in combination a basket, a driving shaft, :1 safety cover, a safety lock including a member movable with the cover and a member mounted upon and rotating with the shaft and being rotatable in thesame direction relatively thereto to pass out ofthe path of said first mentioned member. f

32. A centrifugal extractor including in combination a' basket, a driving shaft, a

safety cover, a safety lock including a member movable with the cover and a member rotating with the cover and a member rotating with the shaft and being rotatable in the same direction relatively thereto and controlling said first-mentioned movable member, and means for preventing starting'of the shaft while the cover is open. 7

33. A centrifugal extractor including in combination a basket, a driving shaft, a.

safety cover, a safety lock including a member movable with the cover and a member ro-. tating with the shaft and being rotatable in the same direction relatively thereto and controlling said first-mentioned movable member, and means cooperating with one of said members for preventing starting of the shaft while the cover is open. I

34. A centrifgual extractor including in combination a basket, a driving shaft, a

safety cover, a safet lock including a member movable with t e cover and a member mounted upon and rotating with the shaft and being rotatable in the same direction relatively thereto and controlling said first mentioned movable member, and means for preventing starting of the shaft While the cover 1s open.

35. A centrifugal extractor includin in combination a basket, a driving shaft, a safety cover, a safety lock including a mem- 10 her movable With the cover and a member mounted upon and rotating With the shaft and being rotatable in the same direction relatively thereto and controlling said first-mention-ed movable member and means cooperating with one of said members for preventing starting of the shaft While the cover is open.

36. In combination with a centrlfugal machine, a driving shaft, a locking sleeve, means, including a key and a diagonal slot,

for positioning the sleeve on the shaft, and

a locking member movable with the cover of the centrifugal, the lockingsleeve being engageable with the locking member for preventing the opening of the cover while the shaft and the basket of the centrifugal ma.- chine are rotating.

In testimony whereof, I have signed my name to this specification.

TANDY A. BRYSON.

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