US2015511A - Compound cylinder - Google Patents

Compound cylinder Download PDF

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Publication number
US2015511A
US2015511A US606784A US60678432A US2015511A US 2015511 A US2015511 A US 2015511A US 606784 A US606784 A US 606784A US 60678432 A US60678432 A US 60678432A US 2015511 A US2015511 A US 2015511A
Authority
US
United States
Prior art keywords
low pressure
piston
cylinder
pressure cylinder
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US606784A
Other languages
English (en)
Inventor
Herbert C Bowen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hydraulic Brake Co
Original Assignee
Hydraulic Brake Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE395762D priority Critical patent/BE395762A/xx
Application filed by Hydraulic Brake Co filed Critical Hydraulic Brake Co
Priority to US606784A priority patent/US2015511A/en
Priority to GB11395/33A priority patent/GB418219A/en
Priority to FR754546D priority patent/FR754546A/fr
Priority to DEH135978D priority patent/DE629288C/de
Application granted granted Critical
Publication of US2015511A publication Critical patent/US2015511A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/224—Master control, e.g. master cylinders with pressure-varying means, e.g. with two stage operation provided by use of different piston diameters including continuous variation from one diameter to another

Definitions

  • An object of my invention is to provide a compound cylinder wherein the outlet port is connected directly to the large cylinder.
  • Another object is to provide a compound cylinder wherein no fluid is by-passed back to the reservoir when the low pressure piston becomes inactive.
  • Another object is to provide a new and improved compound cylinder.
  • Fig. 1 is a vertical section of one embodiment of my invention
  • Fig. 2 is a similar view of a second embodiment of my invention.
  • Fig. 3 is a view of the embodiment illustrated in Fig. 1 but shows the parts in the positions they assume when the low pressure cylinder becomes inoperative;
  • Fig. 4 is a view of the embodiment illustrated in Fig. 2 but shows the parts in the positions they assume when the low pressure cylinder becomes inoperative.
  • I have illustrated my invention as having a casting .5 providing a high pressure cylinder 6 and a low pressure cylinder I.
  • the casting also provides the base 8 of a reservoir 9 having a wall ID of sheet metal or other suitable material.
  • the wall I0 is clamped between a gasket ll carried by the base 8 and a spider I2 which is fastened by means of screws It to a flange l3 formed by the upper end of the casting 5.
  • the edge l5 of spider I2 oyerhangs the wall Ill and serves as a retaining means for the rubber boot I6 which covers the upper end of the reservoir.
  • a piston I1 is located in the high pressure cylinder 6 and is moved in fluid discharging direction by a piston rod l8 which may be actuated by a foot pedal, hand lever, or any other suitable ma ually-operated or power-driven mechanism.
  • the lower end of the piston rod I8 is rounded and simply rests in a socket formed in the upper end of the'piston H with which the lower end of the piston rod l8 forms a separable connection.
  • a low pressure piston I9 is threadedly secured to the. high pressure piston i1 and the joint between the two is sealed by a rubber gasket 20 which also forms a seal between the high pressure piston and the wall of the high pressure cylinder.
  • port 21 connects the reservoir with the high pressure cylinder when the high pressure piston is in the retracted position shown in the drawings.
  • the lowpressure cylinder 1 5 is also in communication with the reservoir by way of port 2
  • the low pressure piston l9 has a cylindrical chamber 21 in which is located a relief valve spring 28 acting on a piston 29 provided with a 25 sealing gasket 30 and a forward extension "3
  • a rubber cup 33 forms a seal with the wall of 30 1 cylinder I and also prevents leakage between the extension 3
  • the cup 33 is held against the forward or lower face of the low pressure piston by retractile spring 34 which has one of its ends abutting against a sheet metal cup 35 35 and its other end resting against a sheet metal valve body 36 which is pressed against a gasket 31 clamped between the end of the casting 5 and a shoulder provided by a cap 38 which is threadedly secured to the lower end of the casting.
  • the valve body 36 has out-let ports 33 which are normally closed by the flange of a rubber cup 40.
  • This valve mechanism is described and claimed in United States Letters Patent No. 1,985,936, of January 1, 1935, in the name of 4 Erwin F. Loweke.
  • One or more fluid conduits 4! may beconnected to the cap 38. These conduits may lead to brake operating cylinders of the type disclosed in United States Letters Patent No. 1,832,135, of '50 November 1'7, 1931, or to any other mechanism operated by fluid pressure.
  • the spring 34 holds the high and low pressure pistons in their elevated or retracted 66 positions. Both the high and low pressure cylinders are in free communication with the fluid reservoir.
  • the upper part of the cylindrical chamber 21 is in communication with the reser- 'voir 9 by way of passage 42 formed in the low pressure piston, andradial passages 43 formed in the high pressure piston and which lead to longitudinal grooves 44 likewise formed in.the high pressure piston.
  • the power end of this chamber 21 is also in communication with the reservoir by way of port 45, annular space 23, passageways 22, high pressure cylinder 6, and
  • the operator relieves the force exerted on the piston rod l8, whereupon this rod may be returned to initial position independently of the pistons by means of the retractile spring commonly associated with the brake lever or by any other suitable means where my compound cylinder is used in fluid systems other than those associated with hydraulic brakes.
  • the high and low pressure pistons are thereupon returned to their retracted position by the spring 34.
  • piston 53 high pressure piston 53 and low pressure piston 54.
  • the pistons are reciprocated on their fluid discharging stroke by piston rod I8, as in the previous embodiment.
  • the high pressure piston 53 is held in elevated positionby a spring 55 which rests on the low pressure piston 54.
  • is in free communication with the reservoir by way of opening 51 formed in the rubber cup 58, passageways 60 and 6
  • the low pressure cylinder 52 communicates with the high pressure cylinder 5
  • valve H has entered passageway 64 and sealed against rubber cup 65, thereby closing the opening through the low pressure piston. Further advance of the high and low pressure pistons causes the low pressure piston to discharge fluid into conduits 4
  • valve H When a predetermined pressure is reached, valve H is moved rearwardly against the tension of spring 12, thereby establishing a. by-pass through the low pressure cylinder by way of passageway 64, the interior of cylindrical member 68, and port 13 as shown in Fig. 4. Thereafter the fluid may freely by-pass the low pressure piston and the high pressure piston functions as the sole means for creating pressure on the fluid in conduits 4
  • valve for automatically rendering said firstnamed piston inoperative upon the creation of a predetermined pressure in said cylinder whereby said high pressure is communicated therethrough to the conduit, and means for reciprocating said pistons.
  • a fluid reservoir communicating with: said high pressure cylinder, a piston in each of said cylinders, said pistons being rigidly connected, a fluid receiving conduit connected solely with said low pressure cylinder, means for operating said pistons, and means for connecting the low pressure cylinder with said high pressure cylinder upon the creation of a predetermined pressure in said low pressure cylinder.
  • a low pressure cylinder a high pressure cylinder
  • pistons in said cylinders a fluid reservoir
  • means for advancing said pistons means operative upon the creation of a predetermined maximum pressure in said low pressure cylinder to open a passageway through the low pressure 5 piston and establish communication between the parts of said cylinders on the pressure sides of said pistons.
  • a high pressure cylinder providing communication between said cylinder and reservoir, pistons reciprocably mounted in said 25 cylinders, means establishing communication between said cylinders when said pistons are in retracted position, means for advancing said pistons to out 01f communication by way of said last-named means, and other means to reestab- 30 lish communication between said cylinders upon the creation of a predetermined pressure in one of saidcylinders.
  • a low pressure cyl- 35 inder a high pressure cylinder
  • a piston in each of said cylinders the low pressure piston having a port therethrough for establishing communication between those parts of said cylinders which are in advance of said pistons, a loaded valve 40 controlling said port, means for reciprocating said pistons, a fluid reservoir communicating with said high pressure cylinder, and a discharge conduit connected to said low pressure cylinder.
  • the 45 combination of a high pressure cylinder, a low pressure cylinder, a high pressure piston in the high pressure cylinder, a low pressure piston in the low pressure cylinder, said last-named piston having an opening therethrough, a valve oper- 50 ated by the initial protractile movement of said high pressure piston to close said opening, operating means for said pistons, and. a conduit receiving the discharge from said cylinders.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)
US606784A 1932-04-22 1932-04-22 Compound cylinder Expired - Lifetime US2015511A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE395762D BE395762A (enrdf_load_stackoverflow) 1932-04-22
US606784A US2015511A (en) 1932-04-22 1932-04-22 Compound cylinder
GB11395/33A GB418219A (en) 1932-04-22 1933-04-18 Improvements in master cylinders for hydraulic power transmission systems
FR754546D FR754546A (fr) 1932-04-22 1933-04-20 Cylindre pour dispositifs de transmission hydraulique
DEH135978D DE629288C (de) 1932-04-22 1933-04-20 Hauptdruckzylinder fuer hydraulische Bremsvorrichtungen, insbesondere fuer Kraftfahrzeuge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US606784A US2015511A (en) 1932-04-22 1932-04-22 Compound cylinder

Publications (1)

Publication Number Publication Date
US2015511A true US2015511A (en) 1935-09-24

Family

ID=24429433

Family Applications (1)

Application Number Title Priority Date Filing Date
US606784A Expired - Lifetime US2015511A (en) 1932-04-22 1932-04-22 Compound cylinder

Country Status (5)

Country Link
US (1) US2015511A (enrdf_load_stackoverflow)
BE (1) BE395762A (enrdf_load_stackoverflow)
DE (1) DE629288C (enrdf_load_stackoverflow)
FR (1) FR754546A (enrdf_load_stackoverflow)
GB (1) GB418219A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4419862A (en) * 1980-03-17 1983-12-13 Lucas Industries Limited Hydraulic master cylinders

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1054846B (de) * 1956-01-26 1959-04-09 Westinghouse Bremsen & Signal Pneumatische Betaetigungsvorrichtung
FR1254516A (fr) * 1960-01-13 1961-02-24 Renault Maître-cylindre à action étagée

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4419862A (en) * 1980-03-17 1983-12-13 Lucas Industries Limited Hydraulic master cylinders

Also Published As

Publication number Publication date
GB418219A (en) 1934-10-18
BE395762A (enrdf_load_stackoverflow)
DE629288C (de) 1936-04-27
FR754546A (fr) 1933-11-08

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