US1310992A

US1310992A - Drum-brake

Info

Publication number: US1310992A
Authority: US
Publication date: 1919-07-22
Anticipated expiration: 1936-07-22

Description

w s, HUTCH-INSON.

I DRUM BRAKE.

APPLICATION FILED JAN. 31. 1917,.

- Patented. July 22, 1919 4 SHEETS-SHEET lawuemfoz I anon wag,

"w. s. HUTCHINSON.

DRUM BRAKE. A'PP-LICATION FILED mma n-wn.

Patented July122, 1919.

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-%1Q GUM/14241, I II."

-W. S. HUTCH INSON.

' DRUM BRAKE.

APPLICATION FILED "JAN. 31. 1917.

4 SHEETS-SHEET s.

i I. Patenteti July 22, 1919.

WILLIAM SANFORD HUTCHINSON, OF. OYSTER BAY, NEW YORK.

DRUM-BRAKE.

Specification of Letters Patent.

' To all whom it may concern Be it known that I, "WILLIAM S. HUTCHIN- soN, a citizen of the United States, and a' resident of Oyster Bay, Nassau county, New York, have invented a new and useful Improvement in Drum-Brakes, of which the I automobiles, although the invention can be following is a full, elear,-and exact description. My invention relates to improvements in drum brakes such. as are generally used on applied to any brake whichis used on'the inner side of a .rotary drum to check or stop the drum from rotation. The object of my invention is to produce a simple and powerful brake of this character which will operate Without reference to the direction of the rotation of the drum, and more especially to provide a simple; strong and efiicient means by which all parts of the shoe will he brought simultaneously to bear' on the inner surface of the-drum. The invention is especially applicable to the type of brake in which a band is dragged'endwise by the frictional contact between the band and the brake drum, and I utilize the drag of the brake shoe to actuate the parts which move all portions of the shoe into simultaneous and firm contact With the drum. practical experiments on automobiles I have found that where brakes of thischaracter are'applied to. the inner" side of the 'drum' and allowed to come into frictional contact gradually along their length, that is to say where there is a drag ing action and the brake shoe takes hold rst at one end, the

parts-wear unevenly, and after atime'this unevenness .is accentuated so that the brake shoe does not operate so quickly and. with such reliabilityas is desirable. In this style Y of brake, the setting mechanism'simply provides for throwing the shoe into contact with the brake drum, and then the movement of the drum causes the shoe, by reason of certain mechanism which is not here necessary 'to define, to come intoforcible contact with the drum and so stop or check the latter.

Patented July 22, rain.

Application filed January 581.1917. Serial No. 145.573.

In my present invention I connect all the equally. This will be clearly understood from the description which follows.

Reference is to be had to the accompany ing drawings forming a part of this specification, in which similar reference characters indicate corresponding parts in all the views. Figure 1 is a broken sectional elevation of my improved brake mechanism taken on the line 1*1 of Fig.=2. I

Fig. 2 is a broken section on the line 2-2 of Fig. 1.

Fig. 3 is 'a detail elevation of the support and guide for the shoe.

Fig, 4 is a side elevation of the connector for connecting the several shoe pressure devices. l

' Fig. 5 is a cross section on the line 5-5 of Fig. 6 f one of the pressure rollers.

Fig. 6 is a side elevation of one of the said rollers.

Fig. 7 is a cross section on the line 7.'?

of Fig. 6. v Fig. 8 is a detail section of a part of the shoe showing its relation to its support.

Fig. 9 is a detail View at right angles to that shown in Fig. 8, bringing out in elevation the relation of a shoe,its support, and the means for forcing the shoe against the drum. Fig. 10 is a detail cross section through the shoe and part of its support.

Fig. 11 is a broken detail side elevation of a part of theshoe. 1

Fig. '12 is across section on the line l212 of Fig. 11.

Fig. 13 is a broken side elevation of a vpart of the shoe support.

i Fig. 15 isa brokenside elevation of a portion of a connector and its means of connection with the shoe.

Fig. 16 is a cross sectionon the line 16-16 of Fig. 15. a

Fi 17 is a broken detail side elevation of at: adjustable block for the pressure de vices or rollers.

Fig, 18 is a cross section on the line 18 of Fig. 17. j 3 4 v Fig. 19 is a plan or face viewdf the struc; ture shown in Fig. 17.

Fig. 20 is a detail side elevation showinga means by which as the brake shoe becomes worn, the lost motion can be taken up.

Fig. 21 is a detail cross section of the structure shownin Fig. 20.

Fig.22 isa broken detailside' elevation of a preferred means of uniting the two members of the connector, and

Fig. 23 is a cross section on the line 23-23 of Fig. 22.

The drum 10 as'shown is the ordinary brake drum of a car,-but as above stated it can be anyrotatable drum to which it is desired to afiix or connect a brake. As illustrated the drum connects with the hub of one of the wheels, and opposite one side of the drum is a plate'or support 11 which is fast to the hollowv axle 12, all the above being purcly' conventional. Within the drum is a support or bracket 13 which may be carried in a stationary manner inany suitable way, but which is shown supported by bolts 15 which pass through the plate or bracket 11, and through holes 16 in the member 13. The member 13 is preferably provided with a transverse strengthening rib 14, and is cut away for a segment as shown at 14 to provide for the brake setting mechanism. At intervals the outer web of the member 13 is notched as shown at 17 to provide opp'o sitely inclined walls 18 on which moves the roller or pressure member 19 which serves to force the shoe 24 against the drum 10. This roller 19 turns on a shaft flattened at 20, these parts lying in the sockets 21 in the connector 22, thus preventing the shaft from turning, while the outer ends of the shaft cari y rollers 23 which bear against the shoe 24. It will be seen that when the drum is moving and the shoe 24 is brought into contact with the drum,.the shoe will move endwise and by reason of its connection with the roller 19 which will be more fully described. presently, the said roller-and the several similar rollers connected therewith will roll upon the inclines 18 and the roll ers 23 will force the shoe into firm contact with the drum.

The outer portions of the pressure devices are preferably covered by caps 25 as shown in: Fig. 1, these caps b6111 secured to the opposite members 22 whic form the conthe rollers 19 run can be adjustable so-as to compensate for wear of the brake shoe and nector. If desired the tracks 18 upon-which 6 drum, as shown in Figs. 17 to 19. Here the tracks are formedon adjustable blocks 36 which have ribs 37 radially arranged and movable in corresponding ways in the stationary support 13, and the blocks 36 are each backed by screws .38 which screw through an adjacent part of the support 13, and thus by adjusting the screws the blocks 36, the tracks 18, and the pressure devices carried thereby can be moved in or outwith reference to the drum and shoe. Any.con-. 1 venient-means can be used forpreventing thescrews from unscrewing, as for instance by runnin pins 39 through slots 40 in the screws and corresponding holes in the memthe rollers are arranged between the shoe 24 r and the stationary part'13 behind it. The screw shafts 42 have squared ends 43, and are secured by lock nuts44. It will be seen that by loosening the nuts and turning the shafts, the eccentric 41 may be adjusted so as to hold the shoe 24 the desired distance from the drum 10, when the shoe is in released position.

The connector uniting the pressure mem bers 19 is preferably formed of two similar rings 22, and. these are firmly united together as shown in Figs. 15 and 16.- Obviously a single member connector could be I used, or the parts may be connected in dif ferent ways without affecting the invention, as I claim any connection between the members 19 which shall, cause'them to all move in unison. As shown however, a spacer 27 is placed between the members 22 at some part of their length, and parts 28 corresponding in size to the spacer 27 are placed on the outside of the members 22,.while rivets 29 or similar fastenings firmly secure all the parts together. 7 This coupling of the members .22 rides in the space 30 (see Fig. 13) which is cut out of the outer portion or web of the member 13,

and suflicient space is left to permit of the necessary movement of the

coupling parts

27 and 28. These coupling members have projections 31 which fit in the space 32 (see Fig. 11) between the brackets 33 of the shoe 24. Thus when the shoe is moved lengthwise it will act on the projections or teeth 31 of the coupling and move the connector 22 and the rollers 19, causing these to simultaneously roll upon their inclines 18, while I all the rollers 23 of. the several pressure devices will impinge at onetime upon-the shoe 24 and force'the latter into firm contact with the drum 10. A preferred means of uniting the two members 22 of the connector is shown in Fi 22'and 23, i1 which a block .45 is provide with a tooth.,; to fit between the brackets 33, and the block is recessed as shown'at 47? soas to fit firmly over the two members 22, the several parts.

being united by rivets 48 or equivalent fastemng.

It will be obvious that other means can'besubstituted for connecting the-coupling with the shoe, and the connector with the pressure devices, without affecting the invention, and I do notlimit my invention to the means shown, although this is well suited for the purpose. .To bring the pressure devices to normal position and also to bring the shoe out of normal position, that is tosay out of contact with the drum, I employ. springs 34 which aref-astened to the sides of the bracket 1'3.and which connect with pins 35 on the connector 22. These springs have oppos te tensionso as to movethe shoe back Without reference to which direction it has been previou'sly moved.

' To set the shoe in operation, that is to bring it into frictional contact with the drum, I have shown conventional mechanism whlch 1s lo- -cated in the space-1ft at the ends of the bracket '13. This mechanism comprises a crank 37 andlinks 38 and 39 connecting the crank with the shoe 24. It {will be observed that not much power is required in this mechanism, as when the shoe is once in frictional contact with the drum the latter Wlll byits movement move the shoe along as already .described,so that the pressure devices 19 and 23will'force the shoe 1nto firm contact with the drum.

It will be seen that the structure which I have described is applicable to any internal strap brake or similar brake in which the drag of the brake shoe actuates pressure devices to force the shoe into firm contact with the drum, and the structure which I have described while serving. primarily as a brake,

would also be adapted for use as a clutch in certain forms of'maclnnery, without changing the mechanism to any extent.

. 19 with larger contact rollers.

-Attention is called to the fact that when the shoe wears, adjustment can also be obtained by providing the shafts of the rollers I claim 1. The combination with the drum and the internal stationary support, of a shoe between the support and the flange of the drum, a plurality of pressure devices carried by the support behind the drum and adapted to force the shoe against the drum flange, and a connector connecting the several pressure devices whereby the moveously transmitted to the others.

- 2. A structure-ofthekind described comment of one pressure device is simultaneprisinga' rotary drum, a shoe within the drum having a limited movement or drag with the drum when in frictional contact therewith, means for bringing the shoe and drum into frictional engagement, pressure devicesspaced apart'behind the shoe, an operative connection between the several pressure devices whereby the movement of one is transmitted to theothers sothat allv will actin unison, and an operative frictional connection between the pressure devlces and the shoe whereby the movement of the shoe with thedrum will actuate the pressure devices.

3. A, brake of the character described comprising a rotatable drum, a shoe within and concentric with the drum flange, said shoenio'Ying endwise when in frictional contact with the drum, means for moving the shoe into frictional engagement with the drum, independent pressure devices spaced apart within the drum behind the shoe and adapted when the shoe is moved endwise to "force it firmly against the drum flange, and a rigid connection between the several pressure devices whereby the. ntward movement of one is instantly andi simultaneously' communicated to the others.

brake of the kind described comprising a rotatable member, a shoe arranged concentrically with and in close proximity,

whereby all will. move in unison.

5. A brake of the kind described comprising arotatable member, a shoe'arranged within and in close proximity to the mem her, said shoe having an endwisel movement when in frictional engagement with said rotatable member, means for moving the shoejnto frictional contact with the memher, a support having. inclined walls, said walls being arranged at intervals behind the shoe, rollers adapted to run on said inclined walls and force the shoe against the rotatable member when the shoe is moved endwise, shafts extending through the several rollers and on which the rollers run, and a connector supporting the several shafts whereby the bodily movement of one shaft will be transmitted to the several shafts.

6. In a brake of the kind described the combination with the drum and the shoe behind and in proximity thereto adaptetl. to move longitudinally when in contact with the drum, of a stationary support behind the shoe, blocks movable in and ont on the support and provided with oppositely inclined walls on the sides next the shoe, rollers arranged to run on the blocks and E" MORGAN GRIFFIN, E. W. GRIFFIN.