GB1590611A - Creation of Inventions and Patents with Artificial Intelligence

GB1590611A – Friction-contact operable device for example the hand-operable brake of a motor vehicle combined with an actuating lever mechanism
– Google Patents

GB1590611A – Friction-contact operable device for example the hand-operable brake of a motor vehicle combined with an actuating lever mechanism
– Google Patents
Friction-contact operable device for example the hand-operable brake of a motor vehicle combined with an actuating lever mechanism

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Publication number
GB1590611A

GB1590611A
GB53978A
GB53978A
GB1590611A
GB 1590611 A
GB1590611 A
GB 1590611A
GB 53978 A
GB53978 A
GB 53978A
GB 53978 A
GB53978 A
GB 53978A
GB 1590611 A
GB1590611 A
GB 1590611A
Authority
GB
United Kingdom
Prior art keywords
lever
spring
friction
contact
operable
Prior art date
1977-01-31
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

Application number
GB53978A
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.)

Kloeckner Humboldt Deutz AG

Original Assignee
Kloeckner Humboldt Deutz AG
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.)
1977-01-31
Filing date
1978-01-06
Publication date
1981-06-03

1978-01-06
Application filed by Kloeckner Humboldt Deutz AG
filed
Critical
Kloeckner Humboldt Deutz AG

1981-06-03
Publication of GB1590611A
publication
Critical
patent/GB1590611A/en

Status
Expired
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

B60T7/00—Brake-action initiating means

B60T7/02—Brake-action initiating means for personal initiation

B60T7/08—Brake-action initiating means for personal initiation hand actuated

B60T7/10—Disposition of hand control

B60T7/101—Disposition of hand control by means of a pull rod

Description

(54) A FRICTION-CONTACT OPERABLE DEVICE, FOR EXAMPLE THE
HAND-OPERABLE BRAKE OF A MOTOR VEHICLE, COMBINED WITH AN
ACTUATING LEVER MECHANISM
(71) We, KLocKNER-HuMsoLDT-DEuTz AKTIENGESELLSCHAFT, a German Body Corporate, of Kbln-Deutz, German Federal
Republic, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to a friction-contact operable device, for example the handoperable brake of a motor vehicle, the device being subject to variations of temperature and having displaceable friction-contact elements arranged to be brought into and out of engagement with one another and a friction surface therein.
A characteristic of such devices in enginedriven vehicles is that if they are brought mechanically into operation when they are at an elevated temperature, at least some of its components, for example friction linings, will after a preceding expansion caused by the heat shrink again as soon as they have cooled down so that a loss of contact pressure and thus of transmissable torque occurs.
It is therefore an aim of the invention to avoid, or at least minimise, the aforementioned disadvantage of a device of the type referred to and to combine it with a lever mechanism arranged to operate so that even when, following a drop in temperature, the shrinkage occurs the required contact pressure will always be maintained.
Accordingly, the invention comprises a friction-contact operable device, for example the hand-operable brake of a motor vehicle, and a lever mechanism, the device being subject to variations of temperature and having displaceable friction-contact element arranged to be brought into and out of engagement with one another and with a friction surface therein by means of the lever mechanism comprising::
(a) a first lever one end portion of which is pivotally mounted on a fixed pivot and pivotally connected to some of the displaceable elements;
(b) a second lever which is pivotally mounted at one of its ends on a pivot disposed on the other end portion of the first lever and the other end of which is pivotally connected to an operating member;
(c) at least one spring the ends of which are directly or indirectly connected to a respective one of said levers and the elastic force of which is such as to inhibit relative pivotal motion between them while the mechanism and device remain at rest and when in operation the contact pressure between the displaceable elements themselves and the friction surface is in its intial stage of application;;
(d) means for releasably securing the mechanism in any position when in operation it has moved the displaceable elements into contact with one another and the friction surface; and wherein the arrangement is such that actuation of the operating member will initally cause the first and second lever to pivot together in the same rotational direction about the fixed pivot and move the displaceable elements into contact with one another and the friction surface, and that prior to the maximum contact pressure being reached the second lever will be pivoted to a limited extent in said rotational direction relative to the first, now stationary, lever thus causing the spring, or springs, to be tensioned or compressed, and as a result thereof to maintain maximum contact pressure between the displaceable elements and the friction surface until released by the securing means.
When due to a drop in the temperature the relevant components subject to the contact pressure shrink, the latter will nevertheless be maintained by the force of the spring, or springs, to an extent which is determined by and corresponds to the characteristic of the spring, or springs, which may be tension or compression springs.
The angle of pivotal motion of the second lever relative to the first one is limited, according to a preferred embodiment of the invention, by two angularly spaced stops on the one end of the second lever
In order to make the invention and some of its optional features more readily understood and to explain its functioning and advantages, two embodiments thereof will now be described in some more detail with reference to the accompanying drawings, in which: Figure 1 is a side view, partly in crosssection, of a friction-operable device according to the invention and constituting the hand-operable brake of a motor vehicle, combined with a lever mechanism for actuating the brake, the mechanism being provided with a tension spring between two of its levers; and
Figure 2 is a partial side view of the lever mechanism shown in Figure 1 but fitted with a compression spring.
One end portion of a first lever 1 of the lever mechanism shown in Figure 1 is pivotally mounted on a fixed pivot pin 2. The lever 1 is provided at its end portion mounted on the pin 2 with a laterally extending arm 3 pivotally joined to a forked end portion 4 of a rod 5 the other end of which is rigidly secured to one end of a radially inner disc carrier 6 of a hand-operable brake 7 of a motor vehicle-not shown. The brake 7 comprises an external casing 8 connected to a vehicle element, or elements, not illustrated-to be braked, for example the rear wheels. A portion of the carrier 6 adjoining its end secured to the rod 5 passes through an end face of the casing 8.The internal peripheral wall of the casing 8 is provided with radially outer disc carriers 9 for guiding two discs 10 which are fast against rotation but axially displaceable. Two discs 12 which are also fast against rotation but axially displaceable are likewise mounted on the carrier 6. Each of the two main faces of each disc 10 is provided with an annular friction lining 13. A plate 14 secured to the other end of the carrier 6 disposed within the casing presses, when the brake is actuated, the discs 10 and 12 including the interposed friction linings 13 against each other and also against a friction surface 15 disposed inside the casing, the surface 15 being, in the embodiment illustrated, the internal surface of the one end face of the casing.
One end of a second lever 18 which is pivotable to a limited extent relatively to the lever 1 is pivotally joined to the latter at a pivot joint 16 including a pivot pin 17 disposed on the other end portion of the lever 1 opposite that mounted on the pivot pin 2. In order to limit the swivel angle of the lever 18 relative to the lever 1, the one end of the former is provided with two angularly spaced stops 19 and 20 one of which will, depending on the direction of pivotal motion of the lever 18 about the pivot pin 17, abut on an abutment 22 disposed on the lever 1. Each of the two levers 1 and 18 is provided with a hook-shaped projection 24 and 25, respectively, serving to hold a respective one of the two ends of a strong tension spring 26 extending, in the embodiment illustrated, substantially parallel with the levers.It is feasible for the spring to be parallel with only one of the levers and also for more than one spring to be directly or indirectly connected to the levers.
One end of a bar 28 is pivotally joined at a joint 27 to the other, upper, end of the lever 18, the bar 28 being provided at its end remote from the joint 27 with a handle 29 which together with the bar 28 form the operating member for the mechanism and thus the brake. The bar 28 is axially displaceable and, if so displaced, arranged to be secured in various positions at and close to its maximum displacement by means of a pawl 30 engaging rack portion thereon.
In order to apply the hand-operable brake 7, the bar 28 is moved axially towards the right by pulling the handle 29 and locked in the selected position at or near its farthest displacement by the pawl 30. As a result of the axial movement of the bar 28 the two levers 1 and 18 will initially be swivelled together about the pivot pin 2 in the same rotational direction-which in the embodiment illustrated is clockwise-so that the rod 5, which is pivotally joined to the arm 3, including the disc carrier 6 secured thereto will be axially displaced.The plate 14 at the other end of the carrier 6 then presses the discs 10 and 12 including the interposed friction linings 13 into engagement with one another and against the friction surface 1S in the casing 8 so that a suitable braking effect on the element to be braked and connected to the casing 8 is obtained. The force of the tension spring 26 is rated so as to inhibit relative pivotal motion between the levers 1 and 18 while the operating member remains at rest and when in operation the contact pressure between the discs 10 and 12 and the surface 15 is in its initial stage of application.
However, upon continued displacement of the operating member and prior to the maximum contact pressure in the brake 7 being achieved, the lever 18 will be swivelled clockwise in the joint 16 relatively to the now stationary lever 1 so that the stop 19 will be lifted from the abutment 22 and, instead thereof, the stop 20 will abut on the abutment 22. As a result, the spring 26 will be suitably tensioned and this spring tension now produces the contact pressure acting on the hand-operable brake 7.
If the latter is applied while at elevated temperature a subsequent reduction of the contact pressure has hitherto been likely due to at least some of its components shrinking when the temperature has dropped.
However, such a reduction of contact pressure will be avoided in a friction-contact operable device combined with a lever mechanism as described in which the force of the spring 26 will, while tensioned, permanently act on the brake and maintain the required contact pressure until the operating member is disengaged from the pawl 30 and returns to its inoperative position thus permitting anti-clockwise pivotal motion of the lever 18 relative to the lever 1 into the position shown in Fig. 1.
The two levers 1 and 18 Ilustrated in Figure 2 form part of a lever mechanism for actuating a device according to the invention which mechanism functions substantially in like fashion as that shown in Figure 1 but in which a compression spring 31 replaces the tension spring 26. The spring 31 comprising a number of stacked cup springs is held between a side face of the lever 1 and the long leg of an arm projecting from the lever 18, the shape of the arm being substantially that of an inverted “L” so that its long leg is substantially parallel with the lever 1.
WHAT WE CLAIM IS:- 1. A friction-contact operable device, for example the hand-operable brake of a motor vehicle, and a lever mechanism, the device being subject to variations of temperature and having displaceable friction-contact elements arranged to be brought into and out of engagement with one another and with a friction surface therein by means of the lever mechanism comprising::
(a) a first lever one end portion of which is pivotally mounted on a fixed pivot and pivotally connected to some of the displaceable elements;
(b) a second lever which is pivotally mounted at one of its ends on a pivot disposed on the other end portion of the first lever and the other end of which is pivotally connected to an operating member;
(c) at least one spring the ends of which are directly or indirectly connected to a respective one of said levers and the elastic force of which is such as to inhibit relative pivotal motion between them while the mechanism and device remain at rest and when in operation the contact pressure between the displaceable elements themselves and the friction surface is in its initial stage of application;;
(d) means for releasably securing the mechanism in any position when in operation it has moved the displaceable elements into contact with one another and the friction surface; and wherein the arrangement is such that actuation of the operating member will initially cause the first and second lever to pivot together in the same rotational direction about the fixed pivot and move the displaceable elements into contact with one another and the friction surface, and that prior to the maximum contact pressure being reached the second lever will be pivoted to a limited extent in said rotational direction relative to the first, now stationary, lever thus causing the spring, or springs, to be tensioned, or compressed, and as a result thereof to maintain maximum contact pressure betweeen the displaceable elements and the friction surface until released by the securing means.
2. A device and mechanism according to claim 1, wherein the angle of the pivotal motion of the second lever relative to the first lever is limited by two angularly spaced stops on the one end of the second lever.
3. A device and mechanism according to claim 1 or claim 2, wherein the or each spring is a tension spring.
4. A device and mechanism according to claim 1 or claim 2, wherein the or each spring is a compression spring.
5. A device and mechanism according to claim 3, wherein the or each tension spring extends substantially parallel with at least one of the levers.
6. A device and mechanism according to any of the preceding claims, wherein a pawl-and-rack arrangement forms the securing means.
7. A friction-contact operable device, for example the hand-operable brake of a motor vehicle, and a lever mechanism, the device and mechanism constructed, arranged and adapted to operate substantially as herein described with reference to Fig. 1 or Fig. 2 respectively of the accompanying drawings.
8. A motor vehicle including a device and lever mechanism as claimed in any of the preceding claims, the device constituting the vehicle’s hadn-operable brake.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. contact pressure has hitherto been likely due to at least some of its components shrinking when the temperature has dropped. However, such a reduction of contact pressure will be avoided in a friction-contact operable device combined with a lever mechanism as described in which the force of the spring 26 will, while tensioned, permanently act on the brake and maintain the required contact pressure until the operating member is disengaged from the pawl 30 and returns to its inoperative position thus permitting anti-clockwise pivotal motion of the lever 18 relative to the lever 1 into the position shown in Fig. 1. The two levers 1 and 18 Ilustrated in Figure 2 form part of a lever mechanism for actuating a device according to the invention which mechanism functions substantially in like fashion as that shown in Figure 1 but in which a compression spring 31 replaces the tension spring 26. The spring 31 comprising a number of stacked cup springs is held between a side face of the lever 1 and the long leg of an arm projecting from the lever 18, the shape of the arm being substantially that of an inverted “L” so that its long leg is substantially parallel with the lever 1. WHAT WE CLAIM IS:-

1. A friction-contact operable device, for example the hand-operable brake of a motor vehicle, and a lever mechanism, the device being subject to variations of temperature and having displaceable friction-contact elements arranged to be brought into and out of engagement with one another and with a friction surface therein by means of the lever mechanism comprising::
(a) a first lever one end portion of which is pivotally mounted on a fixed pivot and pivotally connected to some of the displaceable elements;
(b) a second lever which is pivotally mounted at one of its ends on a pivot disposed on the other end portion of the first lever and the other end of which is pivotally connected to an operating member;
(c) at least one spring the ends of which are directly or indirectly connected to a respective one of said levers and the elastic force of which is such as to inhibit relative pivotal motion between them while the mechanism and device remain at rest and when in operation the contact pressure between the displaceable elements themselves and the friction surface is in its initial stage of application;;
(d) means for releasably securing the mechanism in any position when in operation it has moved the displaceable elements into contact with one another and the friction surface; and wherein the arrangement is such that actuation of the operating member will initially cause the first and second lever to pivot together in the same rotational direction about the fixed pivot and move the displaceable elements into contact with one another and the friction surface, and that prior to the maximum contact pressure being reached the second lever will be pivoted to a limited extent in said rotational direction relative to the first, now stationary, lever thus causing the spring, or springs, to be tensioned, or compressed, and as a result thereof to maintain maximum contact pressure betweeen the displaceable elements and the friction surface until released by the securing means.

2. A device and mechanism according to claim 1, wherein the angle of the pivotal motion of the second lever relative to the first lever is limited by two angularly spaced stops on the one end of the second lever.

3. A device and mechanism according to claim 1 or claim 2, wherein the or each spring is a tension spring.

4. A device and mechanism according to claim 1 or claim 2, wherein the or each spring is a compression spring.

5. A device and mechanism according to claim 3, wherein the or each tension spring extends substantially parallel with at least one of the levers.

6. A device and mechanism according to any of the preceding claims, wherein a pawl-and-rack arrangement forms the securing means.

7. A friction-contact operable device, for example the hand-operable brake of a motor vehicle, and a lever mechanism, the device and mechanism constructed, arranged and adapted to operate substantially as herein described with reference to Fig. 1 or Fig. 2 respectively of the accompanying drawings.

8. A motor vehicle including a device and lever mechanism as claimed in any of the preceding claims, the device constituting the vehicle’s hadn-operable brake.

GB53978A
1977-01-31
1978-01-06
Friction-contact operable device for example the hand-operable brake of a motor vehicle combined with an actuating lever mechanism

Expired

GB1590611A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

DE19772703902

DE2703902A1
(en)

1977-01-31
1977-01-31

ACTUATION LINKAGE FOR FRICTION RESPONSIVE COMPONENTS IN A MOTOR VEHICLE

Publications (1)

Publication Number
Publication Date

GB1590611A
true

GB1590611A
(en)

1981-06-03

Family
ID=5999976
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB53978A
Expired

GB1590611A
(en)

1977-01-31
1978-01-06
Friction-contact operable device for example the hand-operable brake of a motor vehicle combined with an actuating lever mechanism

Country Status (2)

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DE
(1)

DE2703902A1
(en)

GB
(1)

GB1590611A
(en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

DE665009C
(en)

1935-04-27
1938-09-13
Daimler Benz Akt Ges

Brake control lever with automatically changing transmission ratio

1977

1977-01-31
DE
DE19772703902
patent/DE2703902A1/en
not_active
Ceased

1978

1978-01-06
GB
GB53978A
patent/GB1590611A/en
not_active
Expired

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Publication number
Publication date

DE2703902A1
(en)

1978-08-03

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