US2318569A - Hand brake - Google Patents

Description

May 4, 1943.

P. B. CAMP lrrAL 2,318,569

HAND BRAKE File'd Aug. 29, 1958 6 Sheets-Sheet 1 y 1943" P. B. CAMP ElAL HAND BRAKE Fil ed Aug. 29,1938

6 Sheets-Sheet 2 May 4, 1943.

P. B. CAMP Er HAND BRAKE Filed Aug. 29, 1958 6 Sheets-Sheet 3 May 4, 1943. R CAMP AL 2,318,569

I HAND BRAKE Fil ed Aug. 29, 1958 e Sheets-Sheet 4 {nu/ca 7150219 Pezwyfj v @naniffianzkmi Patented May 4, 1943 HAND BRAKE Percy B. Camp, Maywood, and Herbert E. Bartsch, Chicago, 111., assignors to Universal Railway Devices Cc npany, 'a corporation of Delaware Application August 23, 1938, Serial No. 227,328

' 6 Claims. (011 1- 505) This invention relates to railway brakes and more particularly to the manually operated type.

One of the objects of theinvention is the pro-i vision of new and improved mechanism for applying the brakes together with novel means for mounting the brake actuating mechanism within a two-part housing so that the entire mechanism may be removed with one of the parts.

Another object of the invention is the provision of a new and improved" sectional housing for containing the brake actuating mechanism that is so constructed that the parts may be readily and easily assembled and the actuating mechanism so mounted on one of the sections that it may be readily removed with such section without disturbing the remaining section.

A further object of the invention is the provision of new and improved brake actuating mechanism so constructed as to occupy a small space whereby the dimensions of the housing for containing the mechanism is reduced to a'm'inimum.

Another object of the invention is to provide an improved brake actuating mechanism having novel means for mounting the mechanism and for forming the drive shaft.

Still further objects of the invention are to provide an improved housing and brake operating mechanism having great strength anddur-ability, that is inexpensive'to manufactur'aeasily assembled, that provides ready access to the gearing by the removal of one section only of. the housing and that permits the gearing to be entirely removed with such section and the removed assembly to be replaced in whole or in part if expedient or desirable.

Other and further objects and advantages of the invention will appear from the following description, taken in connection with the accompanying drawings, in which a n 1 Fig. 1 is a front elevation of the device;

Fig. 2 is a front elevation of the attaching plate; Fig. 3 is a section on the line 33 of Fig. 1; Fig. 4 is a section on the line 4-4 of Fig. 1;

Fig. 5 is a rear View of the casing and assembled mechanism with the release handle shown in operative position, with parts broken away;

Fig. 6 is a similar View but showing the release handle in inoperative or released position;-

Fig. '7 is a perspective View of the holding pawl;

Fig. 8 is a perspective" View of the pawl actuating shaft and finger;

Fig. 10 is a perspectiveview of the release handleshaft and cam; 1 l

Fig. 11 is a section on the line ll-i I of Fig. 1; Fig. 12 is a vertical section of modified form of pinion, ratchet and drive shaft taken on the line |2l2 of Fig. 13

Fig. 13 is a section on the line |3|3 of Fig. 12; Fig. 14 is a longitudinalvertical section of a further modified form of drive shaft, pinion'and ratchet wheel; Fig. 15 is asection on the line l5l 5 of Fig. 14; Fig. 16 is a view similar to Fig; 1 but showing a modified form of brake operating mechanism; Fig. 17 is a front elevation of the attaching plate of the construction shown in Fig. 16;

Fig. 18 is a section on the line l3 l 8 of Fig. 16; Fig. 19 is a section onthe line I 9-! 9 of Fig. 16;

Fig. 20 is a section on the line ZIP- 20 of Fig. 1d 7 and showing the clutch in operative position;

Fig. 21 :is a View"si1ni1arto Fig. 20 but with parts broken away and showing the clutchin inoperative position;

Fig. 22 is a rear elevation of the brake casing with brake operating mechanism assembled therein; with partswbroken away, and with the release handle in normallyoperating-position; Fig. 23 is a View similar to Fig. 22'; with parts broken away, but showing the release handlein its intermediate position;

Fig. 2e isa perspective view of the holding pawl; r Fig. 25 is a perspective view of the pawl actuating'member; 5

Fig. 26 is a perspective view of the release dle shaft and dog attached thereto; and w Fig. 27 is a perspective view-of the holding pawl'stop. 17 Referring now to the drawings, the reference character 8 indicates a railway car to one end 9 of which is attached thebrake operating mechanism Ill which is contained in a'housing II.

The housing H is in two sections comprising a front casing I2 and a back section orattaching plate 13. The back section or attachingplfate 13 comprises a body portion I4 having attaching lugs 15, 16, ll and'l8 extending outwardly therefrom by means of which the plate is rigidly connected to theend wallofthefcar as by being riveted or bolted thereto. The upper portion 13 of the attaching plate is ofi set outwardly. to provide a ledge which in turn has a lubricating opening 21 normally closed bya closure 22.; Oil maybe supplied to the winding shaft through this opening, as will presently appear. '1

Immediately below .the'offset'portion 18, the

plate is provided with a boss 23, Figs. 2 and 11, which is recessed to receive a bearing for the winding shaft. Below the boss 23, the plate is provided with a hub 24 forming a trunnion journal which is adapted to be received in a bearing in the inner end of the shaft for the winding drum, as will hereinafter be described.

A depression or recess 25, Figs. 2 and 11, is provided in the extreme upper end of the plate which forms a bearing for the inner end of the pawl actuating shaft. The plate 13 is also provided with a narrow flange 26 which extends outwardly a short distance about the margin of the plate, the outer edges of which are in a common plane.

The casing I2 is open at itsrear side and is adapted to be closed by the plate l3 and has a flange about its inner edge that telescopes the flange 23, Figs. 3 and 4, when the parts are assembled. These telescoping flanges will prevent lateral movement of the outer casing during the winding operation. The brake operating mechanism [6, or at least a major portion of it, is mounted within this casing in such a manner as to be removable therewith. The casing I2 is detachably secured to the back plate 13 by means of suitable bolts 21 which extend through the upper portions of the casing and plate and with bolts 28 which extend through the lower portions of the casing and plate. The bolts 21 extend through the outwardly offset portion of the back plate which is provided with lugs 29 for engaging the side face of the bolt heads for preventing turning-of the bolts as when they are applied,

Fig. 3. i The back plate is provided with angular recesses as at 31, see Fig. 4., for receiving the heads of the bolts 28 at the lower portion of the plate for preventing turning of the bolts. It is also provided with flanges or projections that cooperate with corresponding shoulders or projections 50 formed on casing 12, Fig. 4, for forming spacer members between the lower portions of the two sections of the casing.

The casing 12 has mounted therein the brake operating mechanism In or control, Fig. 3, and the parts are so arranged that when the casing is removed, this mechanism is removed with the casing without disturbing its assembly. This mechanism comprises a brake drum 32 having integral therewith a gear 33 for turning the drum. The drum 32 is provided at each end with recesses 34 and 35, Fig. 11, in which suitable bearings such as bronze or the like 36 and 31 are inserted. The bearings are adapted to receive the trunnion journal or hub 24 on the back plate l3 and a trunnion journal 38 extending inwardly from the outer wall of the casing l2. A bolt 39 extends axially through the brake drum 32 and is adapted to extend through an opening axially of the hub or trunnion journal 38. The hub or trunnion 38 is provided with an angular recess for receiving a nut 4| for preventing turning of the same. A nut 42 on the outer end of the bolt 39 is adapted to secure the bolt 39 and with it the drum 32 to the casing l2 so that when the casing is removed, the drum is removed therewith. The nuts 4| and 42 are so adjusted that when the casing I2 is clamped between the nuts 4| and 42, the drum will be free to rotate without binding. The bolt39 merely serves to hold the parts in assembled relation when the casing is removed from the plate. The drum 32 is provided with suitable recesses 43 spirally arranged about the drum for receiving the links of the brake chain when it is wound thereon.

The drum is also provided with suitable means 44 for attaching the end link of the brake chain to the drum.

In order to prevent the teeth of the gear 33 from fouling the chain, the web of the gear, except for the portion where the chain is attached, is provided with an outwardly bulging portion 45 which is adapted to engage the chain and guide it into the groove and prevent its coming in contact with the teeth of the gear. The gear 33 is adapted to mesh with a pinion 46 which is rigidly ;mounted on a winding shaft 41 to the outer end of which the brake operating hand Wheel 48 is rigidly connected. The shaft 41 extends through the outer wall of the casing l2 and is provided with a journal 49 for engaging a bearing 5| which is secured in an opening in the wall as clearly shown in Fig. 11 of the drawings. The pinion 45 has integral therewith a ratchet wheel 52. The shaft 41 is preferably a steel forging and the gear 46 and the ratchet 52, which are integral, may be of cast metal. secured to the shaft 41 in any suitable manner. As shown, the ratchet 52 and pinion 46 are provided with an axial opening 53 through. which the shaft 41 extends, and the shaft is upset at its inner end as indicated in Fig. 11, for holding the parts in assembled relation. The outer end of the axial opening 53 is provided with a recessed locking face 54, preferably square when viewed from the right in Fig. 11 (see Fig. 5), that is, the ratchet 52 is shown as being provided with a square opening for receiving a correspondingly shaped portion 55 on the shaft 41. By means of this arrangement, the parts will be locked against relative rotational movement. The outer end of the pinion 53 constitutes a journal for engaging the bearing 20 in the plate 13, Fig. 11.

It will be seen by an inspection of Figs. 5 and 11 that this bearing shrouds the outer ends of the teeth thereby reinforcing said teeth. The mechanism for holding the ratchet in adjusted position comprises a holding pawl 56, Figs. 6 and '7, which is slid-ably mounted on the webs 51 which extend between the casing l2 and a flange or web 58 extending parallel with the outer face of the casing 12, Figs. 3 and 6, and spaced therefrom. Flanges 59 and GI on the web or partition wall 58 and the outer wall of the casing I2, Figs. 3 and 6, constitute a guide and a stop for the holding pawl 56. The pawl 56 is adapted to be held in ratchet holding position by a holding pawl stop 62 which comprises a sleeve portion 63 loosely mounted on a hub 64 extending inwardly from the front wall of the casing l2, Fig. 11. The lower end of the holding pawl stop is provided with an extension 65, Fig. 1, which is adapted to be turned into a position in close proximity to, or in contact with, the rear edge of the pawl member 56 as clearly shown in Fig. 5 of the drawings. In this position of the holding pawl stop, the pawl is free to move longitudinally but is prevented by the extension 65 from rotary movement. In the position shown in Fig. 5, when the ratchet wheel 52 is rotated counterclockwise, as viewed in Fig. 5, the teeth 66 of the ratchet wheel will engage the inclined surface 61 of the pawl and cause the same to move in a direction parallel with its axis and when the tooth has passed the pawl, the pawl will drop downwardly behind the tooth for holding the ratchet from moving in a reverse direction.

It is desirable that means be provided for causing the pawl to move downwardly in the space between the teeth when a tooth has passed beneath the pawl. In the form of the construction shown, a pawl actuating shaft (it having'a depending finger 59 is provided for this purpose. The pawl actuating shaft 99 is mounted in a recessedbearing II in the back plate I3 and in a corresponding recess bearing I2 in the front plate I2, Fig, 11. The finger 69 is provided with a lower reduced portion 73 which is adapted to engage in a corresponding recess I4 provided in the pawl 59, Figs. 6, '7 and 8. The pawl actuating shaft 68 is provided with a ledge or shoulder I5 which is adapted to be engaged by a projection I6 rigidly mounted on the shaft TI of a release handle 78. The shaft TI extends axially through the hub 69 on which the sleeve 93 is mountedv and the projection I6 is adapted to engage beneath the shoulder I5 on the pawl actuating shaft 68.

The release handle I8 may be enlarged as at I9 to form a weight for holding the projection IS in engagement with the shoulder '55. By means of this arrangement, when the pawl 55, Fig. 5, is forced upwardly and to. the left, in said figure, by a tooth of the ratchet when the ratchet is rotated. the upward movement of the pawl will rotate the shaft 68 clockwise, as viewed in Fig. 5, and this in turn will cause the shoulder '55 which engages the projection 16 to rotate the shaft 71 counterclockwise, as viewed in said figure, thus raising the weight IS a short distance. When the tooth has passed beneath the pawl, the weight of the release handle, together with the weight of the pawl, will tend to move the pawl positively to its lowermost position as the teeth are moved beneath the same.

It is desirable that means be provided for positively releasing the pawl 56. for permitting a free release of the ratchet wheel and incidentally winding drum for releasing the brakes. In the form of the device selected to illustrate one embodiment of the invention, the release handle and mechanism associated therewith are employed for this purpose. The sleeve 69 is providod with a pair of shoulders 85 and 82 which are adapted to be engaged by a shoulder I9 on the projection I6 and by a shoulder 93 on the projection 'l'a, respectively, on the inner end of the shaft II. When the pawl is in ratchet holding position, the release handle member 18 is in the position shown in Fig. 5 and in this position, the shoulder 79 is in engagement with the shoulder SI for holding the pawl stop projection 65 in engagement, or in close proximity to, the pawl 5%, as shown in said figure.

When it is desired to release the pawl, the release handle 18 is turned to the position shown in Fig. 6 and in this position, the shoulder 83 of the projection I9 is brought into contact with the shoulder 82 of the pawl stop 62 for turning the stop counter-clockwise, as viewed in said figure, out of engagement with the pawl. In this position. the tooth engaging end of the pawl is free to partially rotate or move in a vertical position so that the ratchet wheel may turn clockwise, as shown in Fig. 6, for releasing the brake.

The projection 19 is also provided with a shoulder 84 which is adapted to engage a stop 85 integral with the casing I2 for limiting the turning movement of the release handle I8.

In the operation of the device, when it is desired to apply the brake, the release handle is moved to the position shown in Fig. 5 after which the drum is rotated by means of the hand wheel 48 and the ratchet 52 will be held in adjusted position by the pawl 55. When it is desired to release the brakes, this may be done by movingthe release handle I8 clockwise, as

showninliig. 1, for releasingthe pawl 56"after take ittoa distant place, it is only necessaryto disconnect the brake chain from the Winding drum after which the casing I2 and, mechanism may be removed asan assembled unit by first removing the bolts 21 and 28.. By reversing the operation, the parts may be assembled. If it is only desired to inspect or replace parts in situ, the brake chain need not be disconnected.

In Figs. 12 and 13 is shown a modified form of the drive. shaft. In this form of construction, the drive shaft 36 is in the form of a forging having the pinion 81 on its inner end integral therewith. The intermediate portion of the forged shaft 89 is provided with an attaching portion 98 having a plurality of teeth-like projections 99 extending outwardly therefrom which are adapted to engage in corresponding recesses 9! formed in a ratchet wheel 92 which is mounted on the intermediate portion of the shaft. The ratchet wheel 92 is a cast wheel and is provided with reinforcing ribs 93 extending about the angular opening 9I of the ratchet. The shaft 89 is a forgin and is finished with a journal 94 and with the milled pinion 81 and a reduced journal 95.

In Figs. 14 and 15 is shown a further modified form of the drive shaft, pinion and ratchet wheel. In this form of construction, the drive shaft 96 is provided with an integral ratchet wheel 91, the blank of which is forged with the shaft 96. The teeth 98 are cut or milled after the forging is completed. The pinion 99 for operating the brake drum gear is cast separately and is secured to the shaft in any approved manner as by being provided with an angular opening II which is adapted to receive a corresponding angular portion I92 on the shaft 96 or the parts may be welded together. The outer end of the shaft I93 is formed to constitute a journal for the inner end of the shaft.

In Figs. 16 to 27 is shown a modified form of a brake casing and brake operating mechanism. In thisform of construction, the housing I94 is somewhat similar to the corresponding housing I! of the previously described construction and also in thisform of the device, the housing comprises an inner plate or attaching member I and a casing I 96.. The plate I95 has its upper end I9'I reduced in width and off-set outwardly from the car end as in the previous construction. The ledge formed by the connection portion of the, ofiset is provided with an opening I98 through which lubricant may be inserted for oiling the driving shaft as in the previous construction. The plate is provided with upper attaching, laterally extending, perforated wings I99 and I I9 and with the lower downwardly and outwardly attaching wings I I I and H2 by means of which the plate it attached to the end N3 of the car as by means of the bolts or rivets H4 in a manner similar to that already described,

The casing I96 is detachably connected to the plate I95 and cooperates with the said plate to form a housing for containing the brake operating mechanism. The mechanism is so mounted in the casing that when the casing is removed, the brake operating mechanism will be removed therewith as in theprevious construction. The casing I96 has its upper end reduced to correspond with the reduced end I91 of the plate I95. The

casing is open on its inner side and the inner edge is provided with a laterally extending web II which extends only partially across the reduced end portion. The reduced portion of the casin is also provided with a vertical partition I I6 which extends across the reduced portion from side to side thereof for forming an inner bearing for the release handle shaft, as will presently appear, and is integral with the top wall of said portion. The casing I06 is adapted to be held to the back plate by bolts H1, H8, H9 and I2I, Fig. 16, in a manner similar to that already described. I

The plate I05 and the outer wall of the casing I06 are provided with inwardly extending hubs I22 and I 23, respectively, Fig. 20, which form journals for the brake drum I24. The brake drum I24 has an enlarged counterbore in each end thereof within which is mounted the bearings I25 and I26 which engage the hub journals I22 and I23 when the parts are assembled. In order to attach the drum I24 to the casing I06 so that when the casing is removed, the drum will be removed therewith, the drum is provided with an axial opening through which a bolt I21 extends. The hub I23 in the casing I06 is also provided with an axial opening I28 for receiving the outer end of the bolt I21. The opening I28 is provided with a counterbore I20 which is made angular for receiving a nut I3I on the bolt I21. A nut I32 on the outer end of the bolt is adapted to clamp the casing between the two nuts for holding the drum on the hub I23 when the casing is removed. By means of the two nuts, the bolt I21 may be adjusted so that the brake drum is free to rotate on the hub I23. The drum I24 is provided with an integral gear I33 on its inner end which has integral therewith a brake chain attaching portion I34 to which the brake chain I35 isattached. In order t prevent the chain from fouling the teeth of the gear I33 when the brake is applied, the web portion I36 thereof is bulged outwardly, as shown more clearly in Fig. 20 of the drawings.

The gear I33 meshes with a pinion I31, Fig. 20, which is integral with a ratchet wheel I38 havin the ratchet teeth I39 on its periphery. The pinion I31 and ratchet I30 are rotatably mounted on the inner reduced end I4 I, Figs. 20 and 21, of the drive shaft I42. The shaft I42 is adapted to be rotated by a lever or hand wheel I40 on the outer end of said shaft for applying the brakes. The inner ends of the teeth of the pinion I31 are shrouded as at I43, Fig. 21, which materially strengthens said teeth.

It is desirable that means be provided for releasing the brakes without spinning the hand wheel I40. This is accomplished by means of a clutch arrangement which will now be described. The gear I38 has its axial opening counterbored and the hub around the counterbore is provided with clutch teeth I44 extending parallel with the axis of the gear to form one element of a clutch. A sleeve clutch member I45, Figs. 20 and 21, is slidably keyed to the shaft I42 and is provided with inwardly extending teeth I46 which are adapted to interengage or mesh with the gears or teeth I44 on the ratchet gear I38. The adjacent ends of the clutch teeth I44 and I46 have their end surfaces cut at a slight angle, as shown at I41 and I48, Figs. 20 and 21, for facilitating the engagement of the teeth when the clutch is thrown in. By means of this arrangement, the sides of the clutch teeth may be made parallel, as shown, so that positive engagement of the clutch members is provided for both directions of rotation thus eliminating any danger of camming the clutch member I outward while the brake is being applied as might be the case were the clutch teeth tapered.

Suitable means are provided for moving the clutch member I45 into and out of engagement with the clutch teeth on the ratchet wheel I38. This mechanism comprises a radial flange I49 integral with the clutch member I45, Figs. 20 and 21, which is adapted to be engaged by a grooved cam or clutch operating member I5I mounted on the shaft I52 to the outer end of which the release handle I53 is attached. The member I5I is loosely mounted on a shaft I52 to which the release handle I53 is rigidly attached and is located between the front wall of the casing I06 and the vertical partition H6. The handle I 53 is provided with a hub I50 which has an interlocking or toothed engagement with the clutch operating member ISI for turning the latter by the handle I53. The cam member or clutch operating member I5I is so constructed that the shaft I52 may turn through a considerable portion of its movement without moving the clutch member I45, as will presently appear.

Suitable means are provided for holding the brake drum in adjusted position for permitting a gradual release of the brake drum and for disengaging the same from the wheel I40 for a gradual release of the brakes.

In the form of the construction selected to illustrate one embodiment of the invention, the release handle I53 and cooperating mechanism are provided for this purpose. The release handle or lever I53 is adapted to be placed in three different positions. In the first position, as

shown in Fig. 2, the parts are so arranged that the clutch is in engagement and the parts are held in adjusted position by the pawl when the lever or wheel I40 is turned to apply the brakes.

to the dotted line position shown at the right in Fig. 16, the clutch will be disengaged or released thus permitting the brake drum to rotate freely in the reverse direction without moving the hand wheel.

The pawl I55 for holding the ratchet wheel in adjusted position is slidably mounted on the web members I56 and I51 between the partition H6 and the flange II5, Figs. 18 and 23. The pawl I55 is provided at each end on each side thereof with flanges I58 and I59, Fig. 24, between which ribs SI and I62 on the flange H5 and partition I I6, respectively, extend to limit the movements of the pawl. The pawl is also provided with an opening I63 which is adapted to be engaged by a finger I64 of a pawl actuating member I65, Figs. 23 and 25, for positively operating the pawl under certain conditions, as will presently appear. The pawl actuating member I 65 is rotatably mounted on a headed pin I which extends through the web H5, the actuating member I and into the partition II6. It is held in position by the back section or plate I05 so that when the casing I08 is removed, the pin I60 may be readily removed preparatory to removing the pawl actuating member I65.

The pawl actuating member I65 is provided with a counterweight I66 which is curved so as to economize space as will be evident from an inspection-of Figs. 22 and 23. The counterweight I66 is provided with a shoulder I61 which is adapted to be engaged by a finger I68 of an arm I69 which is rigidly connected to the inner end of the shaft I52, Fig. 26, to which the release handle I53 is rigidly connected.

Suitable means are provided for preventing rotation of the pawl and for confining it to a movement longitudinally of its axis when the brake drum is rotated. A holding pawl stop I12 in Fig. 27 is employed for this purpose. This stop comprises a sleeve portion I13 and apawl engaging arm I14. The sleeve I13 is rotatabiy mounted on a hub I extending inwardly from the partition I I6, Figs. 18, 22 and 23. The sleeve I13 is provided with apair of shoulders Band 111 which, in the form-of the construction shown, are about 80 apart to provide considerable lost motion for permitting movement of the release handle 53 from its normal to very nearly its extreme positionwithout positively operating the pawl engaging member I13, as will presently appear.

The shaft I52 is provided with an arm I18 which may be integral with the arm I59 but ofiset inwardly from the finger I68. This arm is provided with a shoulder I15 on one side for engaging the shoulder I11 on the sleeve I13 when the release handle I53 is turned to the normal brake operating position for moving the projection I14 into pawl engaging position, as shown in Fig. 22.

Suitable means are provided for positively releasing the pawl holding member when it is desired to release the brake. In the form of the construction shown, a shoulder I8I on the opposite side of the arm I13 is adapted to'engage the shoulder I16 on the sleeve I12 for positivelymoving the projection I14 out of engagement with the pawl I55 when the handle I53 is movedbeyond clutch disengaging position.

The parts are so constructed that when the release handle I53 is in the position shown in Fig. 22, the shoulder I19 on the arm I18 engaging the shoulder I11 on the sleeve I13 will hold the pawl stop in the position shown in said figure and in this position, the pawl will be held against partial rotation which in turn'will therefore hold the ratchet wheel from rotating in a-reverse direction but when the ratchet wheel is moved clockwise, that is counterclockwise, as viewed in Fig. 22, the inclined surface of the teeth of said gear will engage the inclined surface I82 of the pawl thereby causing the pawl to slideupwardly along its axis and when the tooth has passed the pawl, the same will be caused to drop into the space between the teeth for holding the ratchet wheel from reverse movement. During the upward'movement of the pawl, the finger I64 will bemoved by the pawl upwardly and this will rotate the pawl actuating member I55 counterclockwise, Fig. 22, thus slightly lowering the counterweight I65 and since the shoulder I61 on the pawl actuating member is in engagement with the finger 163, it would tend to rotate the shaft "I which extends axially through the hub I15 in a clockwise direction thus slightly elevating the handle I53 and consequently, when the pawl has passed over the tooth, the weight of this handle member I53 will, by the force of gravity, tend to positively force the pawl downward between the teeth.

If it is desired to gradually or partially release the brake, the release handle I53 is moved into the position shown in full lines in Fig. 23, that is,

it is moved into suchposition that the shoulders I19 and I11 no longer, are engaged. The brake wheel I40 is now rotated forwardly for releasing the .pawl and when the pawl is released,fthe weight of the projection I14 on the sleeve I13 will cause the same to moveidownwardly by gravity out of engagement with the pawl so that the pawl may rotate sufficiently to pass over the tooth when the ratchetis moved in reverse direction. When the brake has been released to the desired amount, the operator will move the handle I53 back to the position-shown in Fig. 22 thereby causing the pawl to hold the ratchet in its adjusted position.

-When'it is desired to releasethe clutch and permit a free release of the brakes, the release handle I53-is turned to the dotted line position shown in'Figs. -16 and .23 which is substantially -1 80-from its normal operating .position. The

parts aresoconstru cted that the groove I56 in the'cam member I5I does not move the clutch until the handle I53:passes the full line position shown'in Fig. 23. Simultaneously with :the release of theclutch, .pawl engaging member I14 is rotated by the engagement of the shoulders I8I and Gas described above.

In order that the release handle I53 shall not remain in its declutching position, after the handle is released, -a,.Spr-ing I83 is employed. lfhis spring-has one end rigidly attached to the casi-ng -asat 484 (and has. its opposite end ex tending gdownwardly and around the driving shaftand .is provided at its end with a hook I85 which is adapted-to be engaged .by a pin I85 rigidlymounted on the cam member 'I 13, Fig. 23. Itw-ill thus be; seen that when the handle I53,

' Fig. 22, is movedto its. intermediate position, as

shown in Fig. 23, the pi-n I85 is in engagement with the hook I85 andthatwhen the handle is moved to the dotted line position shown in Fig.

23, 11; will tension-the-spring so that when the handleis released, the spring will move the same to clutch engaging position. If released suddenly, the spring will throw the handle to its normal operating position,- as shown in Fig. 22.

The brake actuating mechanism in both forms of construction is retained in position in the outer casing principally by-the brake drum gear and walls of' the partition and reducedportion of the outer casing and that. by removing the drum retaining bolt, the parts may ,be readily disassembled for inspectionor substitution or for repairs. If desired 'or expedient, the entire mechanism may be removed and another outer casing and mechanism assembly substituted therefor and the removed structure returned to the factory for. repairs.

It is thought from: the foregoing,,tal :en in connection with the accompanying drawings, that the; operation :and constructionof my de- "vice, will besa'pparent to thoseskilled in the art and that changes insize, shape, proportion and :detailsma-y .be1-madewithout departing from the scope (and spirit 'of t-hexappended claims.

e claim: as our invention:

. 1.;In-a;. railwaybrakaa :section al brake housing comprising zan-inner section-and an outer section, said inner section being adapted to be rigidly attached to a railway car, attaching elements for detachably connecting said outer section to said inner section, brake operating mechanism mounted substantially entirely within said housing and forming with said housing a replaceable unit, said mechanism comprising a winding drum, an operating shaft, means for rotating said drum from said shaft, holding means for said drum, means for controlling the operation of said holding means, cooperating journals and bearings on said mechanism and sections, means for holding said entire brake operating mechanism and holding means assembled as a unitary structure on said outer section when the latter is removed from said inner section whereby when any portion of said unit becomes injured or broken a new unit may be readily substituted therefor, and means exterior of said housing and carried by said outer section for operating said mechanism.

2. In a railway brake, a sectional brake housing comprising an inner section and an outer section, means for rigidly attaching said inner section to a railway car, means for detachably connecting said outer section to said inner section, brake operating mechanism mounted within said housing and constituting therewith a replaceable unit, said mechanism comprising a winding drum, an operating shaft, gearing for rotating said drum from said shaft, pawl and ratchet means for holding said drum in brake holding position, means for releasing said pawl,

cooperating journals and bearings on said mechanism and said sections, means for holding said entire brake operating and drum holding means assembled as a unitary structure on said outer section when the latter is removed from said.

inner section whereby when any portion of said unit becomes broken said unit may be replaced by a new unit, and means exterior of said housing for operating said mechanism.

3. In a railway brake, a sectional brake housing comprising an inner section and an outer section, said inner section being adaptedto be rigidly attached to a railway car, attaching elements for detachably connecting said outer section to said inner section, brake operating mechanism mounted within said housing and constituting therewith a replaceable unit, said mechanism comprising a winding drum, an operating shaft, means for rotating said drum from said shaft, a partition within said outer section, drum holding means including a pawl slidably mounted on said partition for retaining said drum in brake holding position, means carried by said outer section for controlling the operation of said pawl, cooperating journals and bearings on said mechanism and sections, means for holding said entire brake operatingmechanism and holding means assembled as a unitary structure on said outer section when the latter is removed from said inner section whereby when any portion of said unit becomes broken said unit may be replaced by a new unit, and means exterior of said housing and carried by said outer section for operating said mechanism.

4. In a railway brake, a sectional brake housing comprising an inner section and an outer section, said inner section being adapted to be rigidly attached to a railway car, attaching elements for detachably connecting said outer section to said inner section, brake operating mechanism mounted within said housing and forming therewith a removable unitary structure, said mechanism comprising a brake drum rotatably mounted on said sections, a gear rigid with said drum, an operating shaft rotatably mounted on said sections, a pinion rigid with said shaft and for rotating said gear and drum, brake holding mechanism within said housing, said mechanism comprising a slidable pawl, means extending to the exterior of said housing for controlling the operation of said pawl, cooperating journals and hearings on said mechanisms and both of said sections, means exterior of said housing for operating said brake shaft, and means including an element extending axially through said drum and rigidly connected to said outer section for holding said entire brake operating mechanism and said brake holding mechanism assembled as a unitary structure on said outer section when the latter is removed from said inner section whereby said unitary structure may be replaced as a unit.

5. In a railway brake, a sectional brake housing comprising an inner section and an outer section, means for rigidly attaching said inner section to a railway car, means for detachably connecting said outer section to said inner section, brake operating mechanism mounted within said housing and forming therewith a removable unitary structure, said mechanism comprising a winding drum, an operating shaft, a clutch member slidably mounted on said shaft and rotatable therewith, a cooperating clutch member rotatably mounted on said shaft and having a pinion integral therewith, said brake drum having a gear fixed thereon meshing with said-pinion, said cooperating clutch member having a ratchet integral therewith, brake holding means including a pawl for engaging said ratchet, means extending to the exterior of said housing for controlling the operation of said pawl, means including acam member and a control for said cam member for clutching and declutching said clutch members, lever means on the outer end of said shaft exterior of said housing for rotating said shaft and drum, and means including a bolt extending axially of said drum through said outer casing for holding said entire brake operating mechanism and brake holding means assembled as a unitary structure on said outer section when thelatter is removed from said inner section whereby said unitary structure may be replaced as a unit. 7

6. In a railway brake, a sectional brake housing comprising an inner section and an outer section, said inner section being adapted to be rigidly attached to a railway car, brake operating and brake holding mechanism mounted in and carried by said outer section, said mechanism having parts journaled in both of said sections when said sections are assembled, means for holding said mechanism completely assembled in said outer section and removable as a unit with said'outer section from said inner section, and means for holding the sections of said housing together.

PERCY B. CAMP. HERBERT E. BARTSCH.

Images