US2389405A

US2389405A - Hydraulic brake

Info

Publication number: US2389405A
Application number: US518006A
Authority: US
Inventors: Roy R Birchfield
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-01-12
Filing date: 1944-01-12
Publication date: 1945-11-20
Anticipated expiration: 1962-11-20

Description

Patented Nov. 22.0,y 1945 UNITED STATES PATENT )l-I.--`:lli'-.`

HYDRAULIC nannav Roy R..Bir.cheld, Shreveport, La. Application January L2, 194i, sentii-N0. szisioois. a claims. (el. 12s- 152) slide` which aids inguidingr the piston rod for straight line sliding movement;

It is within the province ofthe disclosure to improve generally and t enhance the utility of devices of that type to which* the present invention appertains.

With the aboveandfotherobjectsinview, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and inthe details of construction hereinafter described and' claimed, it being understood' thatl changes inthe precise embodiment of the invention herein disclosed, may be? madewithin the scopeof what is claimed, without departing from the spirit ofthe invention` In the accompanying'd-rawings:

Fig. 1 shows in section', a device constructed` inaccordance with the invention, many parts remaining'in elevation;

Fig. 2` is a section taken through theactua-ting and guiding means, parts being left in elevation.

Fig. 3 is a cross section on1 the line 3'-3- oiA Fig. 1;

The letter ly designates a xed drum. The xed drum F includes aback plate I. 'I-het back plate Il is secured xedly, as indicated at 2; to any accessible` part of a vehicle. The back plate 2 is provided at its peripheryr with aA laterally projecting' annular ila-nge 3. The back plate I1 has a central openingr 5f, for the reception of an axle (not shown). Approximately semi-circular linings 4= arev secured to the inner surface off' the flange 3. The numeral 6 designates approximate ly semi-circular shoes, the ends of one shoebeing spaced from the ends ofA the other shoe, asFig. 1: shows. Each shoe Iiy comprises oppositelydis-- posed= anglemembers BI, including' transverse anges 60 and inwardlyl projectingI flanges 62; On the'outerL surfaces off the flanges lill are disposed'approxi-matel'yl semi-circular linings 'I-, having inwardly' extended tongues 63; disposed between thev ilanges 62- of theI shoes 6. Securing elements 64, suc-hy as rivets; connect theanges 62 and bind the tongues 63L between them: The

liningsl 'F and their; tongues 63 maybe formed by i folding apiece of material as shown in Fig. 3.v A drumis secured to th'e wheel of a vehicle (not shown). The last-specified'`r drum includes' a lateral ange I8, received between the linings I and 4,

Intermediate their ends; thefshoes 6: have in.- WardlyA projecting ngers 8'. The ngersf are sli'dably received'in keepers 9-secured tothe back plate I of the xed drum Guides IU- are secured to thel backl plate I. Spindle slidesl Il! ex.

tending from the ends oiffthel shoes 6, are mounted` for reciprocation in the guides I0; The spindles.

II are provided'with abutment pins I2". Cornpression springs` |24 are-disposed aboutthe spindles II. The springs M" abut againstthev guides- I and against the pinsA Il2. springsy I6- is to4 keep thel adjacent ends of the spindles II received' in outwardly converging grooves Il51, formed in wedge-shaped spreaders lr6. The spreaders I6 lare secured to the ends of: oppositely disposed piston rodslll". Since thev inner ends of the-spindles Ifl'f are received inthe grooves I5 of the spreaders I6;` the piston rodsJ ITWill notl rotate in the structure which-carriesth'em, andvtov be described hereinafter:

The description of thepiston-rods I-I and asso ci-atedl parts will be suspended at this point inthe specification.

Spaced'` guides lgrareshown. The guides lill-aref cylindrical, andare secured at ZIJ tothe back plate I of the fixed drum F. At their outer ends, the guides I9-have integrali` heads 2?'I. The heads 2'I- carry glands 22. The piston rods I'I a-re mounted; for reciprocation in the glands 22.

Foot plates 24 are threaded at 25 upon thev adjacent ends of the guides I9.

' The feet 214' ofth'e guides' I'llare supplied with projecting necks26'; Packed' caps-21am threaded on the necks 26. The capsZT'areassembled* with the bran-ches 28fof a supply/conduit 29: Thesupply' conduit 29 furnishes liquid" under pressure.

A cylinder 3-0 is located within each guide I9f and' is formed integrally with the corresponding necks 2li.V At itsI end' remote from the corresponding branch 28'; each cylinder t!!v is equipped with a gland 3 I. The pistonrods I-'1 are mounted for reciprocation inthe glands 3|. Pistons 3-2 are carried by the rods Il. The pistons 32 reciprocate in the cylinders 30, responsive to the fluidV pressure in the branches 218 of the supply conduit- 29: Packings 3-3 are secured at 34 to the pistons32.

A cylindrical slide 35Y is, mountedv for reciprocation in the guide i9. The slide 35-`hasan integral head 36. The head 36 of the slide 35 is'threaded at 31 on the piston rod Il, and therefore is connected to Ath'e piston rod for reciprocation therewith. A compression spring 38 is disposed about the 'piston rod VI, and is interposed between the head' 2I of the guidev vI!! andthe head 36 of the slide 35. The functionr of the spring 38v is to carryv the piston rod I'I4- andthe piston 32A inwardly, as th'e liquidI in the cylinder 3D recedes. the slide 35- participating in that movement.

s A footplate 39 is threaded'i'ntothe slide 35, or ssecured thereto otherwise; A sleeve lilll is con- One function of the nected integrally intermediate its ends, to the foot plate 39. The sleeve 40 is mounted for reciprocation on the outside of. the cylinder 40. One end portion of the sleeve 40 is mounted to reciprocate in a circular guideway 4 I, formed in the neck 26 on th'e foot plate 24 of the guide I 9.

A guide bracket 42 appears in the drawings. The guide bracket 42 includes a disk or body 43, which is threaded on the cylinder 33. An annular rib 44 projects from the disk 43 of the bracket 42. Headed securing elements 45 are mounted in the rib 44. n

An annular washer plate 4'!4 is held in place by the securing elements 45 and the sleeve 40 can reciprocate in the washer plate. A resilient cushion 48 is mounted jon Vthe washer plate 41 and is of annularform. The cushion 48 has an annular rib 49, abutting against the rib 44 on the disk-like body 43 of the guide bracket 42. An inner ring 59 is threaded on the sleeve 4U to a xed position thereon, .an outer ring 5I being similarly mounted within the cylindrical slide 35. The rings 5U and 5| are Vmounted for reciprocation on the rib 44 of the fixed guide bracket 42. When the slide 35 and the sleeve 49 move down- Wardly, carrying with them, respectively, the rings 5I and 50, the rings come into contact with the cushion 48, and the downward movement of the slide 35 is terminated resiliently and without jar or shock.

As to the operation of the device, broadly considered, liquid under pressuregmoving through the conduit 29, traverses the branches 28, and the piston 32, the rods I1 and the spreaders or actuators I 6 are moved, the spindles II, moving outwardly, and the springs I4 exerting pressure on the shoes 6, pressure being put on the annular flange I8 of the drum on the vehicle wheel (not shown), and a braking operation obviously results. I'he flange 3..and the lining 4 form a dust guard.

In devices heretofore constructed; and embodying, broadly, some` of the structure disclosed in this application, much diiculty has been encountered in producing and sustaining a straight line movement in such a partas the piston rod I'I, the travel of the piston 32 in the cylinder 39 being irregular, wear and leakage resulting, and an unsatisfactory movement `of such parts as the spreaders I 5 being produced. It will be noted that the guide-I9, which is fixed to the support I, is of'considerable diameter, relatively to the diameter of the cylinder 30, and the slide 35 is a large-diametered part also. Moreover, through the instrumentalityv of the sleeve 49, which reciprocates on the iixed cylinder 30, the straight line movement of the piston rod I1 is additionally promoted. The downward movement of the slide 35 is cushioned, because the rings 5I and 50 come into contact with the part 48, which occupies a fixed position on the cylinder 39, since the cushion 48 is carried by the bracket 42 which, in turn, has a fixed mounting on the cylinder 3i).

What is claimed is:

1. In a-vehi'cle brake, a support and means for mounting it fixedly on a vehicle, a wheel-carried drum, oppositely-disposed shoes `movably mounted on the support and engageable with the drum, oppositely-disposed guides of approximately cylindrical form` xedly mounted on'the support and having inner and outer end wal-ls, cylinders carried by the inner end walls, means for supplying 'duid pressure tothe inner ends-of the cylinders,V approximately cylindrical slides mounted ier reciprocation in the guides and having llllll.'

and outer end walls, sleeves carried by the inner end Walls of the slides and mounted to reciprocate on the cylinders, guide rings secured, respectively, to the outer surfaces of the sleeves and to the inner surfaces of the slides, guide brackets secured to the cylinders and having annular ribs slidably received between the' corresponding rings, piston rods secured to the outer end Walls of the slides and received slidably in the outer end walls of the guides, pistons on the rods and slidalole in the cylinders, compression springs interposed between thel outer end Walls of the guides and of the slides, cushions secured to the ribs and engageable with the rings, under the impulse 0f the springs, and coacting means on the rods and on the shoes for pressing the slices against the drums when the pistons move outwardly.

2. In a vehicle brake, a support and means for mounting it iixedly on a vehicle, a wheel-carried i drum, oppositely-disposed shoes movably mounted on the support and engageable with the drum, oppositely-disposed guides oi approximately cylindrical form iixedly mounted on the support and having inner and outer end walls, cylinders carried by the inner end Walls, means for supplying fluid pressure to the inner ends of the cylinders, approximately cylindrical slides mounted for reciprocation in the guides and having inner and outer end walls, sleeves carried by the inner end walls of the slides and mounted to reciprocate on the cylinders, guide rings secured, respectively, to the outer surfaces of the sleeves and to the inner surfaces of the slides, guide lbrackets secured to the cylinders and having annular ribs slidably received between the corresponding rings, rods secured to the outer end walls of the slides and received slidably in the outer end walls of the guides, pistons on the rods and slidable in the cylinders, andv coacting means on the rods and on the shoes for pressing the shoes against the drums when thepistons move outwardly 3. In a vehicle brake, a support and means for mounting it iixedly on a vehicle, a wheel-carried drum, a Vshoe mechanism movably mounted on the support and engageable with the drum, oppositely-disposed guides of approximately cylindrical form iixedly mounted on the support and having inner and'outer end walls, cylinders carried -by the inner end walls, means for supplying iiuid pressure to' the inner ends of the cylinders, approximately cylindrical slides mounted forreciprocation in the guides and having inner and outer end walls, sleeves carried by the inner end walls of the slides and mounted to reciprocate on the cylinders, slidably-interengaged parts carried by the cylinders on the one hand, and by the sleeves and the slides on `the other hand, and Working in conjunction with theguides to constrain the slides to straight-line movement, the sleeves and the slides being spaced transversely for the reception of said slidably-interengaged parts, rods secured to the outer end walls of the slides and received slidably in the outer `end Walls of the guides, pistons on the rods and slidable in the cylinders, resilient means for forcing the pistons inwardly, cushions incorporated in said slidably-interengaged parts and yieldably limiting the movement of the slides responsive to the-resilient means, and coacting means on the rods and on the shoe mechanism for expanding the shoe mechanism against the drum when the pistons move outwardly.

ROY R. BIRCHFIELD.;