GB2167820A - Centrifugal brake - Google Patents
Centrifugal brake Download PDFInfo
- Publication number
- GB2167820A GB2167820A GB08423763A GB8423763A GB2167820A GB 2167820 A GB2167820 A GB 2167820A GB 08423763 A GB08423763 A GB 08423763A GB 8423763 A GB8423763 A GB 8423763A GB 2167820 A GB2167820 A GB 2167820A
- Authority
- GB
- United Kingdom
- Prior art keywords
- worm
- shaft
- torsion spring
- sleeve
- spool
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D59/00—Self-acting brakes, e.g. coming into operation at a predetermined speed
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gear Transmission (AREA)
Abstract
A Centrifugal brake comprises a rotatable shaft 1, and a spool 9 fixed to said shaft, via worm gear 14-18, for rotation therewith relative to a stationary brake drum 12. Rotation of the shaft and spool causes bobweights 10 to pivot (on pins 19) radially outwardly under centrifugal force into braking engagement with the drum. Such radially outward movement is restrained by a torsion spring 5, and variation of the torsional force effected by actuation of the worm gear so as to rotate the spool relative to the shaft 1 will alter the overall braking effect. <IMAGE>
Description
SPECIFICATION
Variable resistance centrifugal brake
This invention comprises the following pieces:
Torque input shaft (1). Spring anchor bush, lock pin and anchor pin (2), (3) and (4). Torsion spring (5). Spool and sleeve assembly (9). Worm bracket and lockpin (14) and (15).
Worm (16). Worm gear and lockpin (17) and (18). Brake drum and ball bearing (12) and (13). Bobweights and friction linings (10) and (11). Bobweight pivot pins (19). The bobweights have pins (8) which project through slots in spool side plate and engage in slots in bar and bush assembly (6). The mechanism is housed in a casing (not shown) apart from the worm gear which is accessible from outside.
OPERA TION
The rotation of shaft (1) is transmitted to the spool assembly (9) through worm gear and worm (16) and (17). The spool assembly is a running fit over shaft (1). The bobweights (10) move out radially due to centrifugal force and are restrained by the slotted bar (6) bearing on pins (8). The movement of bar (8) is controlled by torsion spring (5) and it wili be apparent that by varying the position of the worm gears that the torsional preload on spring (5) can be adjusted and thus alter the overall braking effect of the unit.
1. A Torque Adjustment Mechanism for a centrifugal brake wherein a projecting pin from a centrifugal member operates against a force from a torsion spring co-axial with a central drive shaft. A worm wheel is attached to one end of the central drive shaft and the pivot for the centrifugal member is fitted to a sleeve free to rotate over the central shaft. A worm is installed on the sleeve to engage with the wheel on the central shaft. The sleeve and central shaft are free to rotate in a stationary brake drum and the torsion spring is anchored to the central shaft.
2. A Torque Adjustment Mechanism as in (1) wherein the torsion spring is replaced by tension or compression springs anchored to the pin and sleeve to operate in an equivalent manner.
3. A Torque Adjustment Mechanism as in (1) and (2) wherein the worm gears are replaced by an equivalent spur gear system.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (3)
1. A Torque Adjustment Mechanism for a centrifugal brake wherein a projecting pin from a centrifugal member operates against a force from a torsion spring co-axial with a central drive shaft. A worm wheel is attached to one end of the central drive shaft and the pivot for the centrifugal member is fitted to a sleeve free to rotate over the central shaft. A worm is installed on the sleeve to engage with the wheel on the central shaft. The sleeve and central shaft are free to rotate in a stationary brake drum and the torsion spring is anchored to the central shaft.
2. A Torque Adjustment Mechanism as in (1) wherein the torsion spring is replaced by tension or compression springs anchored to the pin and sleeve to operate in an equivalent manner.
3. A Torque Adjustment Mechanism as in (1) and (2) wherein the worm gears are replaced by an equivalent spur gear system.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08423763A GB2167820A (en) | 1984-09-20 | 1984-09-20 | Centrifugal brake |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08423763A GB2167820A (en) | 1984-09-20 | 1984-09-20 | Centrifugal brake |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8423763D0 GB8423763D0 (en) | 1984-10-24 |
GB2167820A true GB2167820A (en) | 1986-06-04 |
Family
ID=10566996
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08423763A Withdrawn GB2167820A (en) | 1984-09-20 | 1984-09-20 | Centrifugal brake |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2167820A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5967443A (en) * | 1995-08-22 | 1999-10-19 | Tensator Limited | Speed governor for a rotational drive |
GB2354298B (en) * | 1998-05-12 | 2002-12-04 | Weatherford Canada Ltd | Centrifugal backspin retarder |
-
1984
- 1984-09-20 GB GB08423763A patent/GB2167820A/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5967443A (en) * | 1995-08-22 | 1999-10-19 | Tensator Limited | Speed governor for a rotational drive |
GB2354298B (en) * | 1998-05-12 | 2002-12-04 | Weatherford Canada Ltd | Centrifugal backspin retarder |
Also Published As
Publication number | Publication date |
---|---|
GB8423763D0 (en) | 1984-10-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |