GB1580005A - Hand-operable lever assemblies - Google Patents

Hand-operable lever assemblies Download PDF

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Publication number
GB1580005A
GB1580005A GB2328178A GB2328178A GB1580005A GB 1580005 A GB1580005 A GB 1580005A GB 2328178 A GB2328178 A GB 2328178A GB 2328178 A GB2328178 A GB 2328178A GB 1580005 A GB1580005 A GB 1580005A
Authority
GB
United Kingdom
Prior art keywords
lever
ratchet
brake
link
pawl
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
Application number
GB2328178A
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.)
Tyseley Handbrakes & Pressings
Original Assignee
Tyseley Handbrakes & Pressings
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
Application filed by Tyseley Handbrakes & Pressings filed Critical Tyseley Handbrakes & Pressings
Priority to GB2328178A priority Critical patent/GB1580005A/en
Publication of GB1580005A publication Critical patent/GB1580005A/en
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
    • B60T7/102—Disposition of hand control by means of a tilting lever
    • B60T7/104—Disposition of hand control by means of a tilting lever with a locking mechanism
    • B60T7/105—Disposition of hand control by means of a tilting lever with a locking mechanism the lock being released by means of a push button
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
    • G05G5/12—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for holding members in an indefinite number of positions, e.g. by a toothed quadrant
    • G05G5/14—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for holding members in an indefinite number of positions, e.g. by a toothed quadrant by locking a member with respect to a fixed quadrant, rod, or the like
    • G05G5/18—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for holding members in an indefinite number of positions, e.g. by a toothed quadrant by locking a member with respect to a fixed quadrant, rod, or the like by positive interengagement, e.g. by a pawl

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Braking Elements And Transmission Devices (AREA)

Description

(54) HAND-OPERABLE LEVER ASSEMBLIES (71) We, TYSELEY HANDBRAKES & BR< PRESSINGS LIMITED, a British Company of Donovan Works, Northcote Road, Stechford, Birmingham, B33 9BE, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is performed, to be particularly described in and by the following state ment:- This invention relates to hand-operable lever assemblies. Such assemblies are primarily intended for use in motorised vehicles such as diggers, fork-lift trucks, earthmoving equipment and the like. They may be used for controlling the brakes of such vehicles, but may also be used for actuating other mechanisms such as devices for retaining load-carrying parts of motorised vehicles in position after movement.For example, a motorised vehicle having a scoop mounted on pivoting arms by means of which the scoop can be raised and lowered may incorporate a brake-like device operative, when actuated, to hold the arms in any position within their range of movement.
According to the present invention there is provided a hand-operable lever assembly comprising a hand-operable lever proper and a support on which the lever is mounted for pivotal movement about a principal axis, a link pivoted to the lever about an axis parallel to the principal axis and extending past the principal axis, a part of the link beyond the principal axis being constrained to move closer to and further from the principal axis on pivotal movement of the lever and being directly or indirectly connected to or connectable to actuating means for a brake or other mechanism, and releasable ratchet-and-pawl means operative between the lever and the support, the arrangement being such that in use when the lever is pivoted in the direction required to apply the brake or actuate the other mechanism the ratchet-and-pawl means operates (unless released) to prevent pivotal movement of the lever in the reverse direction, and said part of the link moves closer to the pivot axis of the lever, and in the final stages of movement to the fully actuated position the pivot axis of the link passes a little over centre so as to permit said part of the link to move very slightly further from the principal axis.
An embodiment of the invention will now be described in more detail, by way of example, with reference to the accompanying drwings, in which: Figure I is a side view of a handbrake lever assembly embodying the present invention, and Figure 2 is a front view of the assembly shown in Figure 1, as viewed from the right of Figure 1.
The handbrake lever assembly illustrated is intended for use in a motorised vehicle and comprises a handbrake lever proper 10 and a support 11 on which the handbrake lever is pivotally mounted The lever 10 has a body made from sheet metal and in the form of a tubular portion 12 with integral panels 13 projecting on one side thereof, the panels being spaced apart from each other and mutually parallel. The panels 13 extend beyond one end of the tubular portion 12 and are formed with aligned pivot holes through which extends a pivot pin 14. The pivot pin 14 also extends through aligned holes in a pair of spaced, parallel plates 15 which constitute the support 11 and lie outside the panels 13. Spacers 16 are disposed on the pivot pin 14 between the panels 13 and the plates 15. The end portions of the pivot pin 14 are screw-threaded and engaged by self-retaining nuts 17.
A ratchet plate 18 is mounted between the panels 13 and is held in place by the pivot pin 14 and a securing pin 19 which extend through spaced holes in the ratchet plate.
The securing pin 19 also extends through aligned holes in the plates 15; it has a head at one end and a retaining washer and split pin at the other end. The ratchet plate has an arcuate array of ratchet teeth 20 centred on the pivot pin 14 and co-operating with a pawl 21 pivotally mounted between the panels 13.
The pawl is pivoted centrally, having at one end teeth which engage the ratchet teeth 20, and at the other end a hole which receives the cranked end of an operating rod 22.
The other end of the operating rod carries a thumb-operable knob 23 which projects from the end of the tubular portion 12 of the body of the lever. One end of a helical com pression spring 24 bears on the underside of the knob 23, its other end bearing on the base of a pressing 25 which is disposed in the tubular portion 12 and has a flange, at its outer end, which abuts the end of the tubular portion 12. A hand grip 26 moulded from a suitable plastics material is fitted around the end part of the tubular portion 12.
A link 27, co-planar with the ratchet plate 18 and shaped somewhat like the letter L, is pivoted at one end, by means of a pivot pin 28, between the panels 13 of the body of the lever. The link projects through the adjacent side of the lever, which is open, extends around the edge of ratchet plate 18 and terminates between the plates 15. A guide pin 29, similar to the securing pin 19, extends through the end of the link that is between the plates, and also extends through aligned slots 30 in the plates so that the guide pin is constrained to follow a rectilinear path in use.
When the assembly is installed in a motorised vehicle the support is secured in place by bolts which extend through holes 31 in the plates 15. Spacer collars (one is shown) around the bolts maintain the correct spacing between the plates. The guide pin 29 is connected to the brake cable or cables in the usual manner. In an alternative arrangement, which is not illustrated, the guide pin 29 is connected to one end of a second link, of which the other end is pivoted to one end of a bell-crank lever. The brake cable is connected to the other end of the bellcrank lever.
The handbrake lever assembly is illustrated as being in the position it assumes when the brake is fully on. To release the brake it is necessary to depress the knob 23, against the action of the spring 24, and swing the lever 10 about the axis of the pivot pin 14 (this being the principal axis referred to above). The lever can, of course, be swung in only one direction for any attempt to swing it in the other direction would be prevented either by the link 27 abutting the ratchet plate 18 or by the lever abutting the pawl 21.
When the brake is fully released the guide pin 29 is at the opposite end of the slots 30, that is the end further from the pivot pin 14.
When it is desired to apply the brake again the user pulls the lever 10 back towards the position illustrated. This can be done without depressing the knob 23 as the engagement between the pawl 18 and ratchet teeth 20 is such as to permit this movement.
During almost all of this return swinging movement of the lever 10 the guide pin 29 moves along the slots 30 and becomes progressively closer to the pivot pin 14. This movement of the guide pin 29 causes the brake to be progressively applied. As the return swinging movement of the lever proceeds the rate of displacement of the guide pin 29 progressively decreases, that is an increasing mechanical advantage is obtained. If the brake is to be only partially applied the lever 10 is swung to an appropriate position between the fully released position and the fully on position; when the lever is released it remains in that position or in substantially that position, due to the engagement between the pawl and the ratchet. If, however, the brake is to be fully applied the swinging movement of the lever 10 is continued until the lever reaches the position illustrated.During the final stages of movement the pivot axis of the pivot pin 28 passes a little over centre, in that it crosses the extension of the plane that includes the axes of the pivot pin 14 and the guide pin 29.
This over-centre movement permits the guide pin to move very slightly further away from the axis of the pivot pin 14; further, the reaction force applied to the guide pin 29 by the brake cable or cables now serves to assist in retaining the lever in position.
It is to be understood that the plates 15 may be mounted in such a manner that their position can be varied; further, the positions of the holes 31 can be varied as desired; further, the plates 15 may be replaced by plates of any other suitale shape.
WHAT WE CLAIM IS: 1. A hand-operable lever assembly comprising a hand-operable lever proper and a support on which the lever is mounted for pivotal movement about a principal axis, a link pivoted to the lever about an axis parallel to the principal axis and extending past the pricipal axis, a part of the link beyond the principal axis being constrained to move closer to and further from the principal axis on pivotal movement of the lever and being directly or indirectly connected to or connectable to actuating means for a brake or other mechanism, and releasable ratchet-and-pawl means operative between the lever and the support, the arrangement being such that in use when the lever is pivoted in the direction required to apply the brake or actuate the other mechanism the ratchet-and-pawl means operates (unless released) to prevent pivotal movement of the lever in the reverse direction, and said part of the link moves closer to the pivot axis of the lever, and in the final stages of movement to the fully actuated
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. the pivot pin 14 and co-operating with a pawl 21 pivotally mounted between the panels 13. The pawl is pivoted centrally, having at one end teeth which engage the ratchet teeth 20, and at the other end a hole which receives the cranked end of an operating rod 22. The other end of the operating rod carries a thumb-operable knob 23 which projects from the end of the tubular portion 12 of the body of the lever. One end of a helical com pression spring 24 bears on the underside of the knob 23, its other end bearing on the base of a pressing 25 which is disposed in the tubular portion 12 and has a flange, at its outer end, which abuts the end of the tubular portion 12. A hand grip 26 moulded from a suitable plastics material is fitted around the end part of the tubular portion 12. A link 27, co-planar with the ratchet plate 18 and shaped somewhat like the letter L, is pivoted at one end, by means of a pivot pin 28, between the panels 13 of the body of the lever. The link projects through the adjacent side of the lever, which is open, extends around the edge of ratchet plate 18 and terminates between the plates 15. A guide pin 29, similar to the securing pin 19, extends through the end of the link that is between the plates, and also extends through aligned slots 30 in the plates so that the guide pin is constrained to follow a rectilinear path in use. When the assembly is installed in a motorised vehicle the support is secured in place by bolts which extend through holes 31 in the plates 15. Spacer collars (one is shown) around the bolts maintain the correct spacing between the plates. The guide pin 29 is connected to the brake cable or cables in the usual manner. In an alternative arrangement, which is not illustrated, the guide pin 29 is connected to one end of a second link, of which the other end is pivoted to one end of a bell-crank lever. The brake cable is connected to the other end of the bellcrank lever. The handbrake lever assembly is illustrated as being in the position it assumes when the brake is fully on. To release the brake it is necessary to depress the knob 23, against the action of the spring 24, and swing the lever 10 about the axis of the pivot pin 14 (this being the principal axis referred to above). The lever can, of course, be swung in only one direction for any attempt to swing it in the other direction would be prevented either by the link 27 abutting the ratchet plate 18 or by the lever abutting the pawl 21. When the brake is fully released the guide pin 29 is at the opposite end of the slots 30, that is the end further from the pivot pin 14. When it is desired to apply the brake again the user pulls the lever 10 back towards the position illustrated. This can be done without depressing the knob 23 as the engagement between the pawl 18 and ratchet teeth 20 is such as to permit this movement. During almost all of this return swinging movement of the lever 10 the guide pin 29 moves along the slots 30 and becomes progressively closer to the pivot pin 14. This movement of the guide pin 29 causes the brake to be progressively applied. As the return swinging movement of the lever proceeds the rate of displacement of the guide pin 29 progressively decreases, that is an increasing mechanical advantage is obtained. If the brake is to be only partially applied the lever 10 is swung to an appropriate position between the fully released position and the fully on position; when the lever is released it remains in that position or in substantially that position, due to the engagement between the pawl and the ratchet. If, however, the brake is to be fully applied the swinging movement of the lever 10 is continued until the lever reaches the position illustrated.During the final stages of movement the pivot axis of the pivot pin 28 passes a little over centre, in that it crosses the extension of the plane that includes the axes of the pivot pin 14 and the guide pin 29. This over-centre movement permits the guide pin to move very slightly further away from the axis of the pivot pin 14; further, the reaction force applied to the guide pin 29 by the brake cable or cables now serves to assist in retaining the lever in position. It is to be understood that the plates 15 may be mounted in such a manner that their position can be varied; further, the positions of the holes 31 can be varied as desired; further, the plates 15 may be replaced by plates of any other suitale shape. WHAT WE CLAIM IS:
1. A hand-operable lever assembly comprising a hand-operable lever proper and a support on which the lever is mounted for pivotal movement about a principal axis, a link pivoted to the lever about an axis parallel to the principal axis and extending past the pricipal axis, a part of the link beyond the principal axis being constrained to move closer to and further from the principal axis on pivotal movement of the lever and being directly or indirectly connected to or connectable to actuating means for a brake or other mechanism, and releasable ratchet-and-pawl means operative between the lever and the support, the arrangement being such that in use when the lever is pivoted in the direction required to apply the brake or actuate the other mechanism the ratchet-and-pawl means operates (unless released) to prevent pivotal movement of the lever in the reverse direction, and said part of the link moves closer to the pivot axis of the lever, and in the final stages of movement to the fully actuated
position the pivot axis of the link' passes a little over centre so as to permit said part of the link to move very slightly further from the principal axis.
2. A hand-operable lever assembly according to Claim 1 in which the ratchet-andpawl means comprises a ratchet attached to the support, a pawl pivoted to the lever, spring means normally urging the pawl into engagement with the ratchet, and manually operable relase means for pivoting the pawl out of engagement with the ratchet against the action of the spring means.
3. A hand-operable lever assembly according to Claim 2 in which the support comprises a pair of spaced, parallel plates with the ratchet secured between them.
4. A hand-operable lever assembly according to Claim 3 in which the link lies in the same plane as the ratchet and is so shaped as to extend around one edge of the ratchet.
5. A hand-operable lever assembly substantially as hereinbefore described with reference to the accompanying drawings.
GB2328178A 1978-05-26 1978-05-26 Hand-operable lever assemblies Expired GB1580005A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2328178A GB1580005A (en) 1978-05-26 1978-05-26 Hand-operable lever assemblies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2328178A GB1580005A (en) 1978-05-26 1978-05-26 Hand-operable lever assemblies

Publications (1)

Publication Number Publication Date
GB1580005A true GB1580005A (en) 1980-11-26

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ID=10193135

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2328178A Expired GB1580005A (en) 1978-05-26 1978-05-26 Hand-operable lever assemblies

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130346A (en) * 1982-09-29 1984-05-31 Valentin Knott Hand brake
GB2137739A (en) * 1983-04-05 1984-10-10 Bendix Ltd Hand control lever for brake valve
GB2147088A (en) * 1983-09-08 1985-05-01 Case Poclain Corp Ltd Hand lever assembly
US4558609A (en) * 1983-01-06 1985-12-17 Wico Corporation Joystick controller with interchangeable handles
EP0398848A1 (en) * 1989-05-18 1990-11-22 SAME S.p.A. A hand brake control for tractors with reversible driving position
EP0520401A1 (en) * 1991-06-25 1992-12-30 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Toggle type parking brake lever apparatus
EP0600763A1 (en) * 1992-12-03 1994-06-08 ROCKWELL BODY AND CHASSIS SYSTEMS - FRANCE, en abrégé: ROCKWELL BCS - FRANCE Parking brake requiring low application effort for a motor vehicle
EP1088723A2 (en) * 1999-09-22 2001-04-04 FIAT OM CARRELLI ELEVATORI S.p.A. Actuation device for a brake

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130346A (en) * 1982-09-29 1984-05-31 Valentin Knott Hand brake
US4558609A (en) * 1983-01-06 1985-12-17 Wico Corporation Joystick controller with interchangeable handles
GB2137739A (en) * 1983-04-05 1984-10-10 Bendix Ltd Hand control lever for brake valve
GB2147088A (en) * 1983-09-08 1985-05-01 Case Poclain Corp Ltd Hand lever assembly
EP0398848A1 (en) * 1989-05-18 1990-11-22 SAME S.p.A. A hand brake control for tractors with reversible driving position
EP0520401A1 (en) * 1991-06-25 1992-12-30 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Toggle type parking brake lever apparatus
US5303609A (en) * 1991-06-25 1994-04-19 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Toggle type parking brake lever apparatus
EP0600763A1 (en) * 1992-12-03 1994-06-08 ROCKWELL BODY AND CHASSIS SYSTEMS - FRANCE, en abrégé: ROCKWELL BCS - FRANCE Parking brake requiring low application effort for a motor vehicle
FR2698839A1 (en) * 1992-12-03 1994-06-10 Rockwell Abs France Parking brake for motor vehicles with low clamping force.
EP1088723A2 (en) * 1999-09-22 2001-04-04 FIAT OM CARRELLI ELEVATORI S.p.A. Actuation device for a brake
EP1088723A3 (en) * 1999-09-22 2002-12-04 FIAT OM CARRELLI ELEVATORI S.p.A. Actuation device for a brake

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Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee