Патент USA US2110342код для вставки
March 8, 1938. P, SALVO 2,110,342 SAFETY DEVICE FOR HYDRAULIC BRAKES ‘ Filed July 6, 1957 ?gi. 12 .2 a 3 "1.5, 10: t3 6 :5 I10! 16 1O Mm 10:‘ I ~10‘, 10.1 x U'“ 24L‘ g INVENTOR, Patented Mar. 8, 1938 » 2,110,342" UNITED STATES PATENT ‘OFFICE 2,110,342 SAFETY DEVICE FOR HYDRAULIC BRAKES >Pete Salvo, Oakland, Calif. Application Jilly 6, 1937, Serial N0. 152,044 7 Claims. (Cl. 303-—84) tical opening 3 are two aligned longitudinally dis This invention relates to safety/means for hy posed openings 5 and 6 which are located in the draulic brakes.v upper side wall of the casing. The outwardly 'An object of my invention is to provide an’im proved safety device for use with the hydraulic ' disposed ends of the openings 5 and 6 respectively, 6 brakes of an automobile which permits the con tinued operation of - one or more of said brakes even though the ?uid supply line to another of said brakes becomes broken or ceases to function. Other and further objects of my invention will be pointed out hereinafter, indicated in the ap pended claims, or obvious to one skilled in the art upon an understanding of the presentdisclosure. For the purposes of this application I have elected ' to show herein certain forms and details of safety 15 apparatus for use with hydraulic brakes repre sentative of my invention; it is understood, how ever, that the embodiment of my invention herein shown and described is for the purpose of illus tration only; and that it is not to be regarded as 20 exhaustive of the variations of the invention, nor is it to be given an interpretation such as might have the effect of limiting the claims, short of the true and most comprehensive scope of the invention in the art. In the accompanying drawing: Fig. 1 is a vertical longitudinal section or my improved safety“ device for hydraulic brakes; , Fig. 2 is a sectional view taken on the line 2-4 of Fig. 1; 30 \ ' Fig. 3 is a sectional view taken on the line 3—3 of Fig. 1; I Fig. 4 is a sectional view taken on the line 4-4 of Fig. 1; and, r ‘ . v I Fig. 5 is a diagrammatic view showing the means employed for signalling the disability of one of the brakes or the ?uid conduit leading thereto. - I > ' , r ‘ ' " ‘ Referring to the drawing the numeral I desig ‘nates an elongated casing which in ordinary prac 40 tice is secured to a suitable oil reservoir by means of threaded inlet and outlet means 2. The cas ing at a point approximately mid-way between its ends is provided with a large vertical opening 3 extending from the top side of the casing/to a 45 point near its lowenside. The upper end of the are normally closed by suitable means such as UT screws 5' and 6'. Mounted for vertical recipro cating movement in the opening 3 is a cylindri cal ?oating piston ‘I which is open at its bottom end and closed at its top, except for a very small opening ‘I’ through which a limited amount of oil 10 or other pressure ?uid may proceed.in a down ward direction to that portion of the opening 3 located beneath the said piston, and also through which air may pass to break a vacuum in said lower portion of the said ‘opening 3 when the piston moves in an upward direction. The piston 'I is normally but yieldably main tained by a spiral spring 8 in an upwardly dis posed position with its upper end engaging with ‘ a tubular nut 9 which is adjustably screwed in the upper threaded end of the opening 3. The vertical position of the adjustable nut 9 may be adjusted by a screwdriver or other tool so as to change the inactive normal position of the piston ‘I with respect to the bottom end of the hole 3, whereby the amount of the charge of the ?uid ejected by the downward movement of the piston may be varied. The casing I is provided centrally with two large longitudinally disposed aligned chambers I0 .. and II, ‘having, respectively, restricted end por tions I 0' and II’ which communicate with the large vertical opening 3. Secured to the opposite ends of the casing I. and communicating respec tively with the outer ends of the chambers III and II are hollow plugs I (la and Ila. Screwed into‘ the sides of the hollow plugs Ilia and Na respec tively are tubular conduits I2 and I3 leading to the wheel cylinders of the front and rear brakes of an automobile or other brake mechanism if the device is used with hydraulic brakes or other type of apparatus. ‘The hollow plugs‘ I 0a and Ila. are provided with threaded openings which are nor-‘ mally closed by plu'gs I?b and I Ib, the said open ings being intended for use in attachingja pump opening 3 is threaded and is normally closed by a .or other apparatus for priming purposes as will removable screw plug 4. The ?uid inlet and out- " be later described. Secured to the ends of the‘ let means 2 of the casing connects with the upper hollow. plugs “Ia. and Na respectively are tubular end of the large vertical opening 3. In‘ ordinary nuts I00 and I Ic which have tubular bushings “Id 50 practice and in accordance with well known con and Ild secured thereto. The bushings “Id and 50 structions, the oil is discharged under pressure from the oil reservoir into the casing I when the automobile brakes are applied by operating the usual foot‘ pedal or hand lever. _' Communicating with theupper end of the ver 55 rubber or bakelite and rods Ilie and Ile pass re-' spectively therethrough and are insulated from the hollow plugs and the casing bysaid bushings. Ild are made from insulating material such‘ as That ‘portion of each rod We and I Ie which passes I 2 2,110,342 through its respective bushing is threaded, and nuts I01‘ and II)‘ thereon serve to maintain the inwardly disposed ends of said rods in predeter mined positions for a purpose later to be de scribed. The inwardly disposed ends of the rods We and He slidably extend through openings in - the ends of cylinders log and Hg respectively, and each has an enlargedend ‘which prevents its detachment from' its associated cylinder. The 10 inwardly disposed end of the cylinders II'Ig and I lg are closed by suitable screw plugs I4, and lo cated in each of the cylinders is a spiral spring I5 which engages with the said screw plug and the enlarged end of its associated rod. The cylin 15 ders Illg and I lg are spaced from their associated hollow plugs Illa and I la so as to prevent an elec trical current from passing from either of the said cylinders to the casing I as will be later 20 described. Slidably positioned inside the large chambers I0 and II respectively, are pistons I6 and I‘! which are adapted to move from their normal inwardly disposed adjacent positions, outwardly in opposite directions so as to force ?uid from the chambers 25 I0 and II into the conduits I2 and I3, and thence therethrough to the wheel brakes. - Extending longitudinally through the lower side wall of the casing is a small opening I8, the central part of which is in communication with the large vertical opening 3.‘ The ends of the opening I8 are closed by screws or other suitable means. Extending vertically through the lower side wall of the casing I and positioned adjacent the ends of the latter are two openings I9 and 20 35 which communicate with and serve to carry fluid from the opposite ends of the small longitudinal opening I8 to the large chambers I0 and II. The walls of the lower ends of the openings I9 and 45 50 55 60 65 70 75 wardly against the pressure of the spring 8, thereby injecting the ?uid located in the lower end of the opening 3 and in I8 through the open ings I9 and 20 into the chambers I8 and II. As the piston 1 moves downwardly it passes below 10 the points where the restricted end portions I0’ and II’ of the chambers I0 and II join the verti cal opening 3, thereby allowing the ?uid then be ing injected into the casing under pressure to exert an outward force against the pistons I6 15 and H, which are thereby actuated toward the opposite ends of the’ casing. The charges of ?uid in the chambers I0 and II are thereby forced to the brake mechanisms at the vehicle’s wheels, through the conduits I2 and I3. In ordi 20 nary practice the pistons I6 and Il travel out wardly toward but not to points where they en counter the open ends of the hollow plugs Illa and I la, but if either of the conduits I2 or I3 or their associated brake mechanism is disabled thé par ticular piston. associated with the said disabled conduit or brake will be actuated into closing en gagement with its associated hollow plug. If either of .the lines I2 or I3 happens to be broken, that particular line which is broken will be kept 30 closed by its associated piston while the other line will function in its normal way to convey ?uid to and from the brakes to which it is con nected. In normal operation upon releasing the lever or foot pedal the'outward pressure on the 35 inwardly disposed ends of the pistons I6 and I1 is removed, and thereupon the pressure of the compressed ?uid in the wheel brakes moves the said pistons back to their normal positions at the‘ a tubular nut 2| which provides a seat for a ball inwardly disposed ends of the chambers I0 and 40 22, the said balls being yieldably pressed down II. After the pistons have been moved back to wardly by spiral springs 23 to close the openings their normal positions the ?uid returning into I9 and 28. The balls 22 normally prevent ?uid the chambers I0 and II from the conduits I2 from passing downwardly from the chambers I0 and I3 passes through the openings I6’, I6a and and II to the small opening I8, but they allow Il’, I‘Ia of the pistons I6 and I1 respectively, and the ?uid in the opening I8 to be ejected by the - into the vertical openings 25, from whence it downward movement of the piston ‘I into the ?ows through the small openings 5 and 6 into chambers I0 and II. Screwable plugs 24 close the upper end of the vertical opening 3 and the lower ends of the openings l9 and 20. thence outwardly through 2 into the reservoir. Extending downwardly through the upper side So as to provide means for visibly indicating Wall of the casing I in communication with the the brake lines which become broken or disabled upper small longitudinal openings 5 and 6 and I have operatively associated electrical circuits with the inwardly disposed ends of the longitu and electric light globes 29 and 38 with the oper— dinal chambers I6 and II, are vertical openings ating mechanism above described. The rods We 25 which are controlled by balls 26 so as to allow and l to are electrically connected respectively to fluid to pass upwardly from the two chambers the electric light globes 29 and 36, while the latter I8 and It into the small openings 5 and 6 re are connected to one side of a battery 3i or other spectively, but to prevent the reverse movement source of electrical energy. The battery 3| at of ?uid from the said small openings to the said its opposite end is connected to the casing I and chambers. The upper ends of the openings 25 to a ground 32. The inwardly disposed enlarged are threaded and closed by removable screw plugs ends of the rods We and He are in engagement 21. The pistons I6 and ii are provided with with the cylinders lily and Hg respectively and axial openings I6’ and I1’, respectively, the in the inwardly disposed ends of the latter are posi wardly disposed ends of which are closed except tioned so their associated pistons I6 and Il en for radial extensions Mia and Ila leading to an gage therewith when they are moved outwardly nular grooves I61) and Ilb respectively in the toward the outwardly disposed ends of the cas~ peripheries of the inwardly disposed ends of the ing. The spiral springs I5 in the cylinders I89‘ said pistons. The annular grooves 96b and I'll) and Mg permit the latter to be‘ moved outwardly are so disposed with respect to the adjacent ends when the pistons engage therewith so as not to of their respective pistons I6 and I ‘I that the said interfere with the closing of the inwardly dis grooves register with the openings 25 when the posed ends of the hollow plugs Illa and Na by said pistons are disposed in their inwardly dis; the said pistons. When the pistons contact the posed normal positions at the adjacent ends of cylinders 66g and Hg the circuits to the light the chambers. globes ‘29 and 38 are closed, and the globes are When the foot pedal or hand lever is actuated energized and lighted. The globes remain lighted 75 26 are each threaded to adjustably accommodate 40 to cause the application of the braking mecha nism at the wheels of the vehicle, a charge of ?uid is forced through the inlet and outlet means 2 into the casing I. The incoming charge of ?uid causes the piston ‘l to be pressed down— 3 2,110,842 so long as the pistons engage with the cylinders brake mechanism is disabled, means in the casing I09 and Hg, but in normal practice if there is, for conveying charges of ?uid to the chambers, no appreciable leak in the conduits I! or 13 the and means actuated by ?uid entering the casing back pressure of the ?uid will move the said pis for forcing charges of ?uid to the chambers. tons inwardly as soon as the foot pedal or hand 3. In a safety device for hydraulic brakes, a ' lever is released, thereby again opening the cir ciated wlth'the particular energized light globe casing having a chamber having ?uid outlet means and ?uid inlet means’, a piston interposed in the chamber between the inlet means and the outlet means, the piston being adapted to be moved by ?uid entering the chamber to eject a 10 charge of ?uid through the outlet means and thereafter close the said outlet means, and means in the casing and actuated by ?uid enter ing the latter for pumping a charge of ?uid into the chamber, whereby the chamber may contain is disabled. ?uid to be ejected by the piston. cuits to the globes 29 and 30. If one of the con duits I2 or 13V is broken the piston associated with the said broken conduit will remain in a 10 closed position over the open end of its asso ciated hollow plug and also in engagement with the adjacent cylinder. The continued lighting of a light globe after releasing the brakes will indicate that the particular conduit I2 or l3 asso , So as to prime the device after it has been oper ated, when for some reason, such as a broken conduit, there is no back pressure of the ?uid 20 at one of the wheel brakes, one of the plugs lllb or llb (depending on which line is disabled) is replaced by an attachment of a suitable pressure pump, and thereafter ?uid is injected into the casing to force the outwardly disposed piston " back to its normal position at the inwardly dis posed end of its associated chamber In or II.‘ The conduits l2 and I3 ordinarily have'suitable extensions or branches so that ?uid may be sup plied to say, the front wheel brakes by the con v duit l2 and to say, the rear wheel brakes by the conduit l3. ‘ In the event either of the conduits I3 or M breaks there will be no pressure applied to the particular wheel brake associated with the broken conduit, otherwise the'device will function in a normal manner. 40 . 1 This application for Letters Patent discloses subject matter similar to the apparatus shown and described in my co-pending patent applica tion ?led September 5, 1936, Serial No. 99,577, entitled “Safety device for hydraulic brakes”. , 4. A safety device for hydraulic brakes com prising a casing having a pair of chambers and ?uid inlet means, ?uid outlet means and ?uid inlet means associated with the chambers, the 20 said outlet means of each chamber being con nected to a brake mechanism and the said inlet means being connected to the inlet of the casing, a ?oating reciprocating piston positioned in each chamber between its outlet means and its inlet 25 means, the said pistons each being adapted to be actuated by ?uid entering the casing through the inlet means to discharge ?uid from its associated chamber to its associated brake mechanism‘ and to thereafter close the outlet means of its associ 30 ated chamber if is disabled, and to be actuated pressure of ?uid its associated brake'mechanism the said pistons being adapted in reverse directions by back entering the chambers through their outlet means from the brake mechanisms 35 and channel means in the pistons-and the casing for allowing ?uid entering the chambers through their outlet means to proceed to the inlet means of the casing. 5. In a safety device for hydraulic brakes, a casing having a ?uid inlet, a plurality of cham Having described my invention what I claim is: 1. A safety device for hydraulic brakes com’ prising. a casing having a ?uid inlet opening ex bers in the casing, each having a ?uid outlet con tending through its side wall, the casing having casing, a piston in each of the chambers adapted to be actuated by ?uid entering the‘ casing through the latter’s inlet to discharge ?uid from its associated chamber to its associated brake mechanism and to thereafter close the outlet of its associated chamber if its associated brake 50 mechanism is disabled, and means actuated by ?uid entering the casing for injecting a charge ‘of ?uid into the chambers. a pair of oppositely disposed and aligned cham bers communicating at their inwardly disposed ends with the inlet opening, the said chambers each having ?uid outlet means at its outwardly disposed end connected to a braking mechanism, a piston in each chamber, the said pistons each being adapted to be actuated in’ an outward di rection by ?uid entering the casing to force nected to ‘a brake mechanism, and each having a ?uid inlet connected to the ?uid inlet of the 6. In a safety device for hydraulic brakes, a casing having a ?uid inlet, a plurality of cham 55 charges of ?uid from its associated .chamber to its associated braking mechanism, and to close theoutlet means of its chamber if its associated bers in the casing each having a ?uid inlet con brake mechanism is disabled, and said pistons nected to the ?uid inlet of the casing and each being adapted to be actuated inwardly by a back pressure of ?uid entering the chambers through GO the outlet means from the braking mechanisms and means actuated by ?uid entering the casing having a ?uid outlet connected to a brake mech anism, a piston in each chamber, the said pistons each being adapted to be actuated by ?uid en 60 tering the casing to ?rst eject ?uid through the prising a casing having a ?uid inlet opening and outlet means of associated bra'ke the outlet means associated brake a pair of substantially aligned chambers having actuated by ?uid entering the casing for inject for priming the chambers with ?uid prior to the outward movement of the pistons. . ,2. A safety device for hydraulic brakes com-v its associated chamber to its mechanism and to then close of its associated chamber if its mechanism is disabled, means 65 their inwardly disposed ends in communication ' ing a charge of ?uid into the chambers, and with the inlet opening, the said chambers each having ?uid outlet means at their outer ends, pistons in the chambers for ejecting ?uid from the chambers, the said pistons each being adapted means forv indicating the closing of the outlet means Ofeach chamber. ' '7. In a safety device for hydraulic brakes, a 70 casing having a ?uid inlet, a plurality of cham bers in the casing each having a ?uid inlet con to be actuated in an outward direction by ?uid entering the casing to ?rst force charges of ?uid to its associated braking mechanism and to then nected to the inlet‘of the casing and each having close its associated outlet means if its associated a piston in each chamber, the said pistons being a fluid outlet connected to a brake mechanism, 4- 2,110,342 each adapted to be’actuated by ?uid entering ated signalling device associated with each cham the casing to ?rst eject ?uid through the outlet ber, the said devices being each connected in a means of its associated chamber to its associated - normally open circuit, and means for closing the brake mechanism and to then close the outlet means of its associated chamber if its associated brake mechanism is disabled, means actuated by ?uid entering the casing ‘for injecting a charge of ?uid into the chambers, an electrically oper circuits when the pistons are moved to a position whereby the outlet means of the chambers are 5 closed. PETE SALVO.