USRE17147E - saitford - Google Patents

Description

Nov, 27, 1928, R. s. SANFORD VEHICLE BRAKE 2 Sheets-Sheet 1 Original Fild Aug. 15,- I

INVENTOR.

' d n f Qia/ 7" BY 4 n Z ou AToR i EYS. n"

R. S. SANFORD VEHICLE BRAKE original Filed Aug. 15, 1922 A 2 Sheets-Sheet 2 IN VEN TOR.

VMEYS.

Reissued Nov. 27, 1928.

,UNITED STATES PATENT OFFICE.

:ROY S. SANFORD, OF SOUTH BEND, INDIANA, ASSIGNOR, BY MESN'E ASSIGNMENT S,

TO BENDIX BRAKE COMPANY, OF CHICAGO, ILLINOIS, A.

VEHICLE BRAKE.

CORPORATION OF ILLINOIS.

i REISSUED Original No. 1,668,338, dated May 1.. 1828, Serial No. 581,945, led August 15, 1922'. Application for reissue med october 25, 192s. serial No4 315,089.

This invention relates to vehicle brakes of the ty e whereof the opposite ends of the brake Band are-moved in yopposite ldirections in effecting the braking action. y l An object of the invention is to produce a brake of simple and eifective construction.

A very important object of the invention is to make provision for equalizing the friction in a vplurality of brakes between the l brake bands and the drums.

, Equalization of the braking pressure in a plurality of brakes has been 'heretofore effected by various constructions, but it Will be understood that the mere equalization of such l braking pressure does not equalize the braking action of the several'brakes. This could only occur with such constructions if the frictional surfaces werel uniform in the several 1 brakes, but this is almost an impossibility as one brake band Will always tend to seize harder than another. The disproportion between the amount of friction in the 'dierent brakes is liable to increase as the brake bands wear.

To eiiect equalization of the braking action, 'T there is provided mechanism that operates When the friction is equal-in the different brakes to thrust the brake bands against the brake drums with the same degree of pressure and that also operates when the fric'-l tion tends to be unequal to effect as much l vure 1, portions of the far frame member be- 1 greaterpressure on the brake band exacting the less friction and as much less pressure on the band exerting the greater friction as Will substantially equalize the friction in the 'different brakesso that the braking action of the tires upon the road Will be' as nearlyv alike as possible. This. as will be clear, avoids the'v tendency to skidding.

Anotherv important feature of the invention relates to the use of means, such jas acable or other tension element, 'directly connected to a simple operatingv device for the brake friction means, preferably by extending the cable inside the brake drum and there connecting it to the operating device. In one very desirable arrangement. a, flexible Bowden-type `conduit has its end secured to a stationary plate at the-open side of the drum, and the cable extends through this conduit and beyond the end of the conduit intothe brake drum, Where it is connected to a simple brake-operating device.

I also consider that my invention comprises, as a feature Which is broadly new, the combination of a flexible tension element, for example' the above-described cable, with a brake-operating device which can shift to allow one part of the friction device to anchor when the 'drum is-turning in one direction and al different part to anchor When the drum' is turning in the other direction, thus increasing the effectiveness of the, friction means Without complicating the operating mechanism. Preferably the brake is adjusted to compensate for Wear, and thereby avoid undue movement from the one anchorage to the other, by an adjustable device atone end, and which is illustrated as transmitting the braking torque to the brake anchor, and,v which may, according to my invention, be adjusted without 'affecting either the anchorage or the operating means.

Other features and objects of the invention, including )the novel structure and arrangement of the operating means, and other new combinations of parts and desirablerv particular constructions, will be apparent from the' following description' of the illustrative embodimentsshown in the accompanying drawings, in which:

Figure 1 is a plan viewof a chassis provided with the invention. v

Figure 2 is a` longitudinal section of Fig- Figure 6 is an enlarged sectional detail of' the operatingcable, one of thesleeves therefor and the sleeve-supporting bracket.

Figure 7 is an enlarged sectional elevation i -from the line indicated by 7 7 Figure 3.

Figure 8 is an enlarged sectional detail on the.' line indicated by 8 8 Figure 3.

Figure 9 '1S an enlarged fragmental sec-.

tional deeaiien 111ev une indicated bye- 9 Fig.

jure 5 the parts being shown in position. with the brake band contracted.

Figure lOvis an enlarged fragmental secics tional detail similar to Figure 9 showing the parts in position for expanding the brake band.

Figure 11 is an elevation, similar to Figure 3, of a modified form of brake embodying the invention. Y

Figure `12 is an enlarged sectional detailon the line indicated by 12-12 Figure 11.

Figure 13 is a side elevation of a brakeoperating member of different construction than shown in Figures 1 and 2, a fragment of the cable operated thereby also being shown engaging the sleeve.

Referring first to the form of the invention illustrated in Figures 1 to 10, inclusive, there is provided a brake drum 15 having an integral end plate or head 16 and a substantially cylindrical braking flange. Inside of the drum 15 is a hub 17 through which extends the stub shaft 71 of the steering knuckle 18. Bolts 19 pass through the hub 17 Athrough the head 16 and through the hub of the vehicle wheel to secure the brake drum to said wheel.

The steering knuckle 18 is provided with a flange 72 having its periphery concentric with the stub shaft 71 so that saidflange `can be turned olf in a lathe, the radius of said iiange being greater than the distance from the axis of the 'shaft to the upper or lower end of the knuckle. v bolted a face plate 7 3V having a central orifice 74 and arranged at the open side of the brake drum. The; flange 72 is provided with a shoulder 75 fitting the orifice 74 and said flange overlaps the inner face of the plate 73 adjacent the orifice 74.` Thus the fiange and plate are flush at their outer faces. The plate 73 is provided near its periphery with an inwardly projecting stud or anchor 20 and said plate is reinforced at this point by a plate 21. A shoulder 22 on the stud 20 is seated against the inner face yof the plate 21.

The stud 2O constitutes a pivot for a novel cam 23 which Ais formed on one end of a lever 24. The cam 23 is recessed at 25 to fit part way. around the stud 20 4so that the cam will ivot on the stud. The upper cam face 26 o the cam engages a block 27 which is provided with a threaded stud 28 adjustably engaging an ear` or fitting 29 that is secured to one end of an interna-l brake band 30.

A turning the block 27 the same is adjust-ed toward" or from the ea-r 29 for adjustably expanding or contracting the brake band relative to the drum. It Will be observed that block constitutes an adjusting device for compensating forv the wear of the brake without affecting either the anchoragecr the operating means of the brake; also, that the braking torque in one direction of rotation of the drum is vtransmitted through the adjusting device to the stud or anchor 20.

The' under cam face 31 of the cam rides upon an .ear or fitting 32 which is secured To the flange 72. is-

to the other end of the brake band 30. The 'ear 32 is provided with a recessv 33 to aecommodate a portion of the stud 20 when the face 31 of the cam is inl full contact with a fiat face 34 of the ear 32.

To the inner face of the plate 73 are se'- cured eyes 36 to each of which is secured one end of a spring 37. The other ends of the springs 37 are fastened to eyes 38 on the inner face of the brake band. These springs serve to normally hold the brake band spaced from the brake drum to prevent dragging of the brake band on said drum when the brake is off. The eyes 36 are in the form of angular brackets and the legs 39 of said brackets -extend parallel with the periphery of the brake drum and are provided with adjusting screws 40 bearing against the inner face of the brake band to limit contraction of said *band produced by the springs 37. To the usual service pedal 4 5, said cables being pro.-

vided with turnbuckles 46 for adjustment purposes. The cables 44 are connected to the brake operating member 45 on opposite sides of the fulcrum 47 of said member so that when said member is pushed forwardly by the operator both cables 44 will be pulled to set each of the four brakes. The cables 44 are connected with the cables 41 by sleeves 48 mounted on the cables 41. The cables 41 pass through flexible sleeves such as Bowden-type conduits 49 and through brackets 50 which are 'fixed to suitable supports. In the instance" shown in the drawings the. 'front brackets 50 are fixed to the front axle51 and the rear brackets to theframe 42. The sleeves 49 are inserted at one end in the brackets l50, as clearly ,shown in Figure 6. At the ends adjacent the brakes, sleeves or conduits 49 pass adjacent the sWive-ling axes of the Wheels. where they are secured to back- -the cable ends of the levers 24, This 'causes each cam 23 to move from the position shown site points of the cam riding against the block 27 and the ear 32, respectively, so as to force the opposite ends of the brake band away from each other, thus expanding said band against the inner face of the brake drum in a, manner readily understood.

As the cam 23 turns on the abutment 20 in applying the brake, when the vehicle is moving forward, the shape of the cam is such as to force the fitting 29 somewhat upwardly, but nevertheless this fitting' remains anchored through cam 23 on abutment 20vt-hroughout the operation of applying the brake, whereas cam 23 pries the fitting 32 downwardly away from abutment 2O until the brake' is fully applied. Thus there is in the forward direction no shifting of the anchorage during or after the application of the brake. In reverse, however, the drum friction shifts the entire brake assembly to bring fitting 32 back into anchoring engagement with abutment 20. When the brake is properly adjusted, however, this shifting is not great, and it takes place as soon as the friction means engages the drum and before the brake is fully applied, and is therefore not noticeable in practice.

Let? it be assumed that the vehicle is traveling forwardly and that, in consequence, the

brake drum in Figures 9 and 10 is traveling in the direction of the arrow a. In each brake the lever arm operating against the ear 32 is longer than that operating'against the block 27 and hence the tendency is to move the ear 32 a greater distance than the block 27. The resistance to expansion of the brake band is less at the ear 32 than at the ear 29 since the rotation of the brake band is in the direction of expansion movement of the band toward said drum. The tendency is for the brake drum to rotate the band in a direction to move the block 27 toward the stud 20 to retract the lever It will now be seenthat if the degree of friction between the brake band and the drum is greater in one of the brakes than in any of the others the tendency to rotation of the bra-ke band in the brake having the greater friction will be greater than of the brake band in the brake having the lesser friction and,

-consequently, that band having the greater friction on the drum will retract its associated lever 24 sufficiently to exert a pull on the adjacent end of the cable 41 in a directions opposite to and counteracting the pull on the lmuch less pressure will be effected on the band exerting the `greater friction as will substantially equalize the friction between the, differy 'ent drums and their associated bands.

It is readily understood that the coefficient of friction between the frictionally engaging .members l5, 30 does not depend solely Aupon in Figure 9 to that shown in Figure 10; oppo-"d-the materials of which said members are conf structed butdepends somewhat upon the degree of smoothness of the friction surfaces l`and also upon the degree of dryness of said the brake band and tends to rotate said band in a direction to hold the ear 32 against the stud 20 and to move the block 27 away from said stud. The lever arm working against the block 27 is longer when the brake is set to oppose backing of the vehicle than when the vehicle is movlng forward. Even though this is the case, the drums rotation tending to lock the band to the drum effects a powerful braking action-that is highly advantageous to prevent the vehicle'from rolling backward down a grade when necessity demands that the vehicle 'stop while climbing the grade, and the longer lever arm enables the operator to tighten the band by movement thereof only in the\\ direction of rotation of the drum. A

A spring 52 serves to retract the lever'24. Mounted on the stud or anchor 20 isa retaining plate 53 pressed against the lever 24 by. a coil spring 54 surrounding the stud between said plateand a washer 55. The washer 55 is retained on the stud' by a cotter pin 56.

Now referring more particularly to the modified form of the invention illustrated in Figures 11 and 12, the parts that correspond to those above described will be indicated by the same reference characters with the addition of a primemark. These parts are the brake. drum 15', plate .16', stud 20', reinforcing plate 21', shoulder 22', brake band 30', cable 41', flexible sleeve 49', spring 52', retaining plate 53', spring 54', washer 55', cotter pin 56', and face plate 73' having an orifice 74'.

The differentiating construction shown in Figures 11 and 12 is as follows: Fulcruined on the stud 20' is a lever 57. To one end of the lever 57 are pivoted at 58 links 59 which in turn are pivoted at 60 to an e'ar 61 secured to one end of the brake band 30'.

Pivoted to the lever 57 at 62 is a link l63 carrying a threaded'l stud 64 which engages a turnbuckle 65. The turnbuckle 6.5 also engages a' threaded stud 66 which is pivoted at 67 to an ear 68 secured tothe other end of the brake band 30'. It is clear that by adjusting the turnbuckle l the opposite ends of the brake band, may be moved toward or from izol v each other. The lever 57 is retracted by the spring 52.

Pivoted at 69 to the lever 57 is a clevis 7 0 secured to the cable 41 passing through the flexible sleeve 49.

The operation of the modified form of the invention is similar to that described for the preferred form, for when the lever 57 is operated to expand the brake band the tendency is for said brake band to' rotate in 'the direction of the arrow b in Figure 11, thus tending to retract the lever 57.

l In thqe construction illusrated in Figure l a brake-pperating member 45 is mounted on a fulcrum 47 and is provided with a sleeve 76 having angularly disposed ends 77 turned in oppoite directions. The cable corresponding with thecables 44 are joined into a single cable 44( which is slidable in the sleeve 76 so that, with this modified construction, operation of the brake-operating member 45 will cause 'equalization of the friction in all four brakes, thus making it possible. to produce maximum braking effort for each wheel without danger ofskidding.

The vcombination of the cable with the forms of brake herein described, when employed on the front wheels, has the advantage of effecting equal braking friction for said wheels re ardless of the fact that said wheels are dirig ly mounted for 'steering `of the vehicle. f

At this point it may be noted that the sleeves 48 are friction tight on the cables 41 and may be adjusted by force to any desired position on said cables. Thus it is possible to v change the relative leverage or pull of the Sables 41 upon the levers 24 so that, if there is too great a difference in the friction components in the brakes on opposite sides of the vehicle for effective equalization with the cables 44 pulling on the centers of-the cables 41, ad-

justment of the sleeves 48 to either side of said center ma be made to effect greater leverage on the lirake band having the poorer friction surface and to effect less leverage on the brake band having the better friction. surface.

The construction hereinbefore described for holding the brake band retracted from the drum has this advantage over prior constructions employed for this purpose, that the springs 37 pull the brake band inwardly not only but also hold the band tightly against the inner face of thel face plate 73, thus to eX- ,fludc dirt and water from the interior of the drum. The springs' 37 connectY the plate 7 3 near its periphery with points on the @band that are adjacent the edge of theband farthest from saidf'acelplate. Thus the pull of the springstoward the face plate is more direct than itis toward the axis of thedrum, al-

` most the entire available tension of -the springs 37 acting to hold the band'in cont-act with the face plate.

It shou ld be especially noted that the simple operating mechanism described permits the cable 41 or its'equivalent to Vbe connected directly to a novel shiftable operating device at the brake, which permits tht-#shifting of band 30 or equivalent friction means so that it may anchor at 'one end when the drum is turning in one direction and at the other endI when the drum is turning in the other direction, thus being at all times fully efsaid retarding means, said'power applying 90 means including mechanism operating to distribute the applied power between said retarding means proportional to the amounts of fritcional resistance between the rotary members and the retarding means to secure substantially equal retardation of said rotary members, together wth a device for adjusting the retarding means to compensate for wear without affecting the operation of said mechanism.

2. The combination with two rotary members, of frictional braking means for eaclr member, and a common means for applying power to said brakingmeans, said power-applying means including mechanism operating to distribute the applied power between said retarding means proportional to the amounts of frictional vresistance between the rotary members and the retarding means to effect equal amounts of friction in both braking means, l together with a device for adjusting the retarding means to compensate for wear without affecting the operation of said mechamsm.

tively moving members, of means. retarding the relative movement between they members .of each pair, and a common means applying power to the retarding means of both pairs of 3. The combination with two pairs of rela- 1.15

members,A said power applying means including mechanism operating automatically for transmitting the applied power to the retard- L l ing means to secure substantially equal Ietardatlonof the relative movement between the members of the vtwo pairs, together with a fixed part to which the torque of the retarding means is transmitted through the powerapplying means. 1

4. The combination with a pair of brake drums and a floating band for each drum, of' 130 pivotally mounted levers connected on opposite sides of their pivotal axes with the opposite ends of the brake bands, means connecting the levers, and means to operate the connecting means including a driver-operated member, said operating means permitting of movement of the connecting means by the levers without moving the said member, together with a `fixed part adjacent each drum to which the braking torque is transmitted in either 'direction of rotation of said drum.

5. In a vehicle brake, the combination of a rotatable drum, a floating band to engage the drum, means .to yieldingly hold`theband lretracted, and lmeansincliiding a flexible tension element extending into the drinn and which means is operatable when the drum is rotating in one direction positively to hold one end of the band anchored throughout the operation of applying the brake andto move the other end in a direction corresponding to said direction ofi'otation of the drum.

6. In a vehicle brake, the combination of a inner face of the drum, means to yieldinglyA hold the band contracted, and means including a flexible tension element extending into the drum and which means is operatable when the drum is lrotating in one direction positively to hold one end of the band anchored throughout the operation of applying the brake and to move the other end away fromv the stationary end in a direction corresponding to said direction of rotation of the drum. 7 In a vehicle brake, the combination'of a drum, a face plate ofless diameter than the drum, a brake band inside ofthe drum, means yieldingly holding the band against the face plate,and means to expand the brake band.

8. A brake comprising, in combination, a drum, a fixed anchor member at one side of the drum, a floating expansible friction bandl like device having separable v'ends between which the anchor member is arranged and which is arranged to anchor at one end on said member when the drum is turning in one direct-ion and to anchor at the other end on said member when the drum is turning in the otlier'direction, a floating applying device for forcing said ends apart to apply the brake,

and an adjustable thrust member rigidly 'mounted on and adjustably fixed at one end of the friction device rand engaging the applying device and through which the braking torque is transmitted to the anchor member in one direction of drum rotation and `which 'can be adjusted to compensate for wear of the friction device without affecting the anchorage or the applying device.

9. A brake comprising, in combination, a drum, a fixed anchor member at one side of the drum, a floating expansible friction bandlike device having separable ends between which the anchor member is arranged, a floating applying device for forcing said ends apart to apply thebrake, andan adjustable thrust member rigidly mounted on and adjust-ably fixed at one end of the friction de-` drum, a fixed anchorage, and a floating friction device anchoring thereon in one direci t1on of drum rotation and having a part rigidly mounted thereon and which is adjustable to compensate for Wear and which trans- .inits the torque to said anchorage in the other direction yof drinn rotation and which includes adjusting means for expanding the friction -device to adjust the effective circumf ferential length, 'and applying means acting at least in part on the adjusting means so that the applying means is not affected by the adj ustment.

11. A brakecomprising, in combination, a 4

drum, a fixed anchorage, a floating friction device having different parts anchoring thereon in opposite directions of drum rotation and which Aincludes adjusting. means rigidly mounted on and carried by the friction device for expanding the friction device to compensate for wear, and applying means acting at least in part on the adjusting means so that the applying means is not affected by the adjustment.

12. A brake comprising, in combination with a drum, floating friction means having one part which anchors when the drum is turning in one direction and a different part which anchors when the "drum is turning in the other direction, at least one of said parts being adjustable to compensate for Wear of the friction means, and both of said parts bcing rigid with and carried by said floating friction means. n

13. A brake comprising, in combination With a drum, floating friction means having one part which anchorswhen the driim is turning in one direction and a dierent part which anchors when the drum is turning in the other direction, at least one of said parts being adjustable to compensate for wear of the friction means, and both of said parts being rigid with and carried by said floating friction means, together with brake-applying means-acting on said two parts of the friction. means.

14. A brake comprising, in combination, a drum, floating friction means Within the drum and anchoring at one end when the drinn is turning in one direction and at the other end when the drum is turning in the other direction, applying means Wholly Within the drum and acting on said ends and sliiftable to allow the anchorage on either of said ends, and a flexible tension element directly connectedto said applying means and permitting the shifting of the app-l ing means and co-operating with the ends o the friction means to form the sole support for the applying means.

15. A brake comprising, in` combination, a

drum, floating friction means -within the drum and having one part which anchors when the drum is turning in one direction and havinga different part which anchors when the drum is turning in the other direction, applying means wholly within the drum and acting on said friction means and shiftable Vto allow the anchorage on either of said'parts, and a flexible tension element directly connected to said.; applying means and permitting the shifting of' the applying means and reacted onby the rotational tendency of the friction means.

16. A brake comprising, in combination, a drum, a support at the open side of the drum, friction means housed within the drum and between the 'drum and support and having one art which anchors when the drum is turning in one direction and a different part which anchorswhen the drum is turning in the other direction, applying means within the drum and shiftable to allow either of said parts to anchor, and a fiexible tension element extending through the support into the drum and there connected'to said applying means and co-operating with the ends of the friction means to form the sole support for the applying means.

17. A brake comprising, in combination, a drum, a support at the open side of the drum, friction means housed within the drum and l between the drum and support, floating applying means wholly within the drum and a iexible tension element extending through the support into the drum and there connected to said applying means and co-operating with the ends vof the friction means to forml the sole supportfor the applying means.

18. A brake comprising, in combination, a drinn, a support at the open side of the drum, friction means housed within the drum and between the drum and support and having one part which anchors when the drum is turning in one direction and a different part which anchors when the drum is turning in the other direction, applying means within the drum and shiftable to allow either of said parts to anchor, a flexible conduit iixedly secured `at its end to the support, and a flexible device extending through the conduit and inside of the drum beyond the conduit and there connected to said applying means.

19. A brake comprising, in combination, a drum,'a sup vrt at the open side of the drum, friction me ns housed within the drum and between the drum and support, applying means within the drum, a fiexible'condnit ixedly secured at its end to the support, and

a flexible device extending throughtheconduit and inside of the drum beyond thecon duit and there connected to said, applying means.

20. A brake for a swiveled Wheel comprising, in combination, a drum rotating and swiveling with the Wheel, a support at the open side of the drum swiveling but not rotating with the wheel, friction means acting port at `the open side of the drum, friction means acting on said drum and arranged within the drum, a'flexible conduit secured to the support at one end to said frame at the other end, and a flexible operating element extending` through the conduit into the interior of the drum and arranged to operate the friction means.

22. A brake comp ising, in combination, a drum, friction mean housed within and expansible against the drum, an applying'device within the drum for expanding the friction means vand. which can shift'bodily,and a iiexible tension element extending through the open side of the drum into the interior of .the drum and there connected to said'applying device. f

23. A brakel comprising, in combination, a fixed member, friction means having sepa'- rable ends and a fioating applying device recessed at one side to fit over said fixed member when shifted in one direction and arranged to lact on said ends, said device being unrestrained by said member when shifted in the opposite direction.

drian. a fixed member, friction means having separable ends and an applying device recessedto fit oversaid fixed member and disconnectedly engaging said ends, one of said ends anchoring through the applying device when the drum is turning in one direction and the other of said ends anchoring on the fixed member when the drumfis turning in the other direction.

25. A brake comprising, in combination, friction means having separable ends, a fixed support arranged to take the torque of the friction means, and a floating rigid lever member directly engaging said ends and operable to pry .them apart to apply the brake and whichd is capable ofshifting bodily with respect to said support. i

26. A brake comprising, in combination, a drum, friction means within the drum having' separable ends, a fixed support arranged to take the torque of the friction means, and

a rigid lever member having parts engaging" said ends and an operating lever portion extending inwardly of the cli-nin and which is operable to rock said parts in opposite directions to apply the brake, and which is capable of shifting bodily with respect to said support.

27.- A brake member adapted for co-operation with a drum comprising a ioating fullcircumferential internal band having a plurality of thrust members rigid therewith, in ,combination with a drum and an anchorage member taking the torque from one of the thrust members when the drum is turning in one direction and from the other thrust member when the drum is turning in the other direction, at least one of s'aid members being adjustable to compensate for wear of lthe brake member.

28. A brake member adapted for co-operation with the drum comprising a floating full-circumferential internal band having at its opposite ends thrust members rigid therewith, in combination with a drum and an anchorage member taking' the torque from one of the thrust members when the drum is turning in one direction and from the other thrust member when the drum is turning in the other direction, at least one of said members being adjustable to compensate for wear of the brake member.

29. A brake comprising, in combination, a drum, a floating friction device within the drum anchoring at one end when the drum is turned in one direction and anchored at the other end when the drum is turned in the other direction, at least one of said ends including an anchoring part rigidly mounted on the floating friction device and adjustable in a direction increasing the effective length of the friction device, and means for applying the friction device' to the drum such that in` at least one direction of rotation of the drum the correspondingend of the friction device is definitely maintained anchored thrpughout the operation of applying the bra ze.

30. A brake comprising, in combination` a drum, a floating friction device within the drum anchoring at one end when the drum is turned in one directiomand anchored at the other end when the drum is turned in the other direction, at least one of said ends including an anchoring part rigidly mounted on the floating friction device and adjustable in a direction increasing the effective length of the friction device, and means for applying ,the friction device to the drum such that in one direction of rotation of the drum friction shifts the anchorage to the other' of said ends.

31. A brake comprising, in combination., a

rotatable drum, a floating flexible friction band arranged within the drum having a thrust member rigidly but adj ustably mounted at one .end and having a thrust` member rigidly and non-adjustably mounted at-the other end, a fixed anchor between said ends and taking the torque from one of the thrust members when Vthe drum is turning in one direction and from the other of the thrust members when the drum is turning in the other direction, a floating applying device within the druml acting to force said thrust members apart to apply the brake, and a flexible tension element extending within the drumand operatively connected to the floating applying device within the drum.

32. A brake comprising, in combination, a rotatable drum, a floating flexible friction band arranged within the drum having a thrust member rigidly but adj ustably mounted thereon at one point and having a thrust member rigidly and non-adjustably mounted thereon at the other end, a fixed anchor between said thrust members `and taking the torque from one of the thrust members when the drum is turning in one direction and from the other of the thrust members when the drum is turning in the other direction, a floating applying device within the drum acting to apply the brake, and a flexible tension element extending withinthe drum and operatively connected to the floating applying device within the drum.

33. `A brake comprising, in combination, a rotatable drum, a floating flexible friction band arranged within the drum having a thrust member adjustably ymounted thereon at one point and having a thrust member non-adjustably' mounted thereon at another point, a fixed anchor between said thrust members and taking the torque from one of the thrust members when the drum is turning in one direction and from the other of the thrust members when the drum is turning in the other direction, a floating applying device within the drum acting to apply the brake, and a flexible tension element extending within the'drum and operatively connected to the floating applying device within the drum.

In testimony whereof I have hereunto signed my name. i

' RoY s. SANFORD.

Images