GB2229250A - A wheel for transmitting a load from an elongated flexible drive element to an axle - Google Patents
A wheel for transmitting a load from an elongated flexible drive element to an axle Download PDFInfo
- Publication number
- GB2229250A GB2229250A GB9002709A GB9002709A GB2229250A GB 2229250 A GB2229250 A GB 2229250A GB 9002709 A GB9002709 A GB 9002709A GB 9002709 A GB9002709 A GB 9002709A GB 2229250 A GB2229250 A GB 2229250A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hub
- wheel
- rim
- rim member
- axle
- 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- Withdrawn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
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/30—Chain-wheels
-
- 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
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
- F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
- F16D7/024—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces
- F16D7/025—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces with flat clutching surfaces, e.g. discs
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pulleys (AREA)
- Transmissions By Endless Flexible Members (AREA)
Abstract
A wheel (10) for transmitting a load from an elongated flexible drive element to an axle includes a circular rim member (12) having a radially outwardly facing circumferential channel (14) for receiving an elongated flexible drive element, such as a chain (23), the rim member being mounted on a hub (18) for connection to an axle (24). The wheel includes an annular friction plate (28) mounted within the rim member. The hub (18) and the friction plate (28) are biased towards each other by biasing means (30) such that the rim member (12) is held captive between the hub and the friction plate, the biasing means being adjustable to adjust the bias exerted thereby on the friction plate and on the hub. <IMAGE>
Description
A WHEEL FOR TRANSMITTING A LOAD FROM AN ELONGATED
FLEXIBLE DRIVE ELEMENT TO AN AXLE
THIS INVENTION relates to a wheel for transmitting a load from an elongated flexible drive element to an axle, eg a chain wheel for a chain block.
According to the invention, there is provided a wheel for transmitting a load from an elongated flexible drive element to an axle, the wheel including
a circular rim member having peripheral seat means for receiving an elongated flexible drive element;
a hub for connection to an axle and whereon the rim member is mounted; and
frictional gripping means, the hub and the frictional gripping means being biassed towards each other by biassing means such that the rim member is held captive between the hub and the frictional gripping means, the biassing means being adjustable to adjust the bias exerted thereby on the frictional gripping means and on the hub member.
The peripheral seat means may be in the form of a radially outwardly facing circumferential channel provided on the rim member, the channel having a plurality of circumferentially spaced cog formations for engaging the links of a flexible drive element in the form of a chain, the rim member further having a radially inwardly projecting circumferential rib which is held captive between the hub and the frictional gripping means.
The frictional gripping means may comprise an annular friction plate mounted within the rim member on the opposite side of the rim member from at least part of the hub, the annular friction plate being biassed by the biassing means towards the hub.
The biassing means may include a plurality of circumferentially spaced coil springs, each coil spring being received over a bolt which screwingly interconnects the annular friction plate and the hub, each spring being stressed and under compression and engaging the bolt head at one end of the spring and engaging, at the other end of the spring, the annular friction plate to urge the plate towards the hub, the bias exerted by each coil spring being adjustable by means of screwing the bolt into or out of the hub.
The hub may have a central boss with an opening therethrough for connection to an axle.
An annular friction ring may be provided between the hub and the rim, the friction ring engaging the rim in an axial direction adjacent the outer periphery of the ring to grip the rim against the frictional gripping means, and the hub engaging the opposite side of the ring adjacent the inner periphery of the ring in an axial direction to urge the ring axially against the rim.
The invention will now be described by way of example, with the accompanying diagrammatic drawings, in which:
Figure 1 shows a diametric sectional view of a wheel according to the invention, taken at I-I in Figure 2;
Figure 2 shows a side view of the wheel of Figure 2;
Figure 3 shows the opposite side view of the wheel of Figure 2; and
Figure 4 shows an exploded view of part of a chain block incorporating a wheel according to the invention.
In the drawings, reference numeral 10 generally indicates a wheel for transmitting a load from an elongated flexible drive element to an axle, according to the invention.
More particularly, the embodiment of the, wheel 10 shown in the drawings is in the form of a chain wheel for a chain block.
The wheel 10 comprises a circular rim member 12 having peripheral seat means in the form of radially outwardly facing circumferential channel 14 provided thereon. The channel 14 has a plurality of circumferentially spaced cog-formations 16 for engaging the links of a flexible drive element in the form of a chain 23 (Figure 4). The rim member 12 also has a radially inwardly projecting circumferential rib 15.
The wheel 10 further comprises a hub 18 on which the rim member 12 is mounted, and which includes a central boss 22 for connection to an axle 24.
The wheel 10 further includes frictional gripping means 26 comprising an annular friction plate 28 mounted within the rim member 12 on the opposite side of the rib 15 of the rim member 12, from the hub 18. The inner periphery of the plate 28 seats on, and is centered by, the outer periphery of the boss 22.
Biassing means 30 are provided, which bias the hub 18 and the friction plate 28 towards one another, such that the rim member 12 is held captive via circumferential rib 15, between the hub 18 and the friction plate 28.
The biassing means 30 include a plurality of circumferentially spaced coil springs 32, each of which is received over a bolt 34, which bolt 34 screwingly interconnects the annular friction plate 28 and the hub 18, by screwingly engaging a screw threaded socket 36. Three sockets 36, with their bolts 34, are provided at equally circumferentially spaced positions on the hub 18, radially outwardly of the boss'22.
Each of the springs 32 is stressed under compression and engages the head 38 of the associated bolt 34 via a washer 40 at one end of the spring, and engages the annular friction plate 28 at the other end of the spring, to urge the plate 28 towards the hub 18. The bias exerted by each coil spring 32 is adjustable by means of screwing the bolt 34 into or out of the hub 18.
An annular friction ring 42 is provided between the hub 18 and the rim 12. The friction ring 42 engages the rim 12 via circumferential rib 15 in an axial direction adjacent the outer periphery 43 of the ring 42, to grip the rim 12 against the friction plate 28. The hub 18 engages the opposite side of the ring 42 adjacent the inner periphery 44 of the ring in an axial direction to urge the ring 42 axially against the rim 12.
Locating pin 45 locates the hub 18 and the friction ring 42 circumferentially relative to one another. The pin is screwed radially inwardly into a shoulder 45.1 on the hub 18, on which shoulder 45.1 the inner periphery 44 of the ring 42 seats to centre it. The outer end of the pin is received in an indentation 45.2 (Figure 3) in the inner periphery 44 of the ring 42.
Referring to Figure 4 of the drawings, in use, the chain wheel 10 according to the invention forms part of a chain block 50, part of which is shown in exploded view in the' drawing.
The chain wheel 10 fits into cover members 52, together with the axle 24 and other components.
The bias exerted by the coil springs 32 is adjusted by screwing bolts 34 into or out of the hub 18, to a pre-determined degree. Thus, the rim member 12 is held captive between the hub 18 and the friction plate 28 by a pre-determined gripping force.
When a load is lifted by means of the chain block 50, the load is connected to one end of the chain 23, and the other end of the chain 23 pulled eg by an operator. The load is transmitted by the wheel 10 to the axle 24. If the load exceeds the gripping force holding the rim member 12 captive between the hub 18 and the friction plate 28, then the rim member 12 will rotate between the hub 18 and friction plate 28, relative to the axle 24, and a working load will then not be transmitted to the axle 24. In this manner, the wheel 10 can be adjusted to transmit loads up to a pre-determined maximum only, to the axle 24, depending upon the capacity of the chain block 50.
Thus, it is an advantage of a wheel 10 according to the invention that a chain block 50 incorporating the wheel 10 can be set to lift loads up to a pre-determined maximum only, depending upon its capacity. In this manner, failure of a chain block due to overloading, and resultant injury to workmen operating the chain block, and damage to equipment, can in principle be greatly reduced.
Claims (7)
1. A wheel for transmitting a load from an elongated flexible drive element to an axle, the wheel including
a circular rim member having peripheral seat means for receiving an elongated flexible drive element;
a hub for connection to an axle and whereon the rim member is mounted; and
frictional gripping means, the hub and the frictional gripping means being biassed towards each other by biassing means such that the rim member is held captive between the hub and the frictional gripping means, the biassing means being adjustable to adjust the bias exerted thereby on the frictional gripping means and on the hub member.
2. A wheel as claimed in Claim 1, wherein the peripheral seat means is in the form of a radially outwardly facing circumferential channel provided on the rim member, the channel having a plurality of circumferentially spaced cog formations for engaging the links of a flexible drive element in the form of a chain, the rim member further having a radially inwardly projecting circumferential rib which is held captive between the hub and the frictional gripping means.
3. A wheel as claimed in Claim 1 or Claim 2, wherein the frictional gripping means comprises an annular friction plate mounted within the rim member on the opposite side of the rim member from at least part of the hub, the annular friction plate being biassed by the biassing means towards the hub.
4. A wheel as claimed in Claim 4, wherein the biassing means includes a plurality of circumferentially spaced coil springs, each coil spring being received over a bolt which screwingly interconnects the annular friction plate and the hub, each spring being stressed and under compression and engaging the bolt head at one end of the spring and engaging, at the other end of the spring, the annular friction plate to urge the plate towards the hub, the bias exerted by each coil spring being adjustable by means of screwing the bolt into or out of the hub.
5. A wheel as claimed in any one of the preceding claims wherein the hub has a central boss with an opening therethrough for connection to an axle.
6. A wheel as claimed in any of the preceding claims, wherein an annular friction ring is provided between the hub and the rim, the friction ring engaging the rim in an axial direction adjacent the outer periphery of the ring to grip the rim against the frictional gripping means, and the hub engaging the opposite side of the ring adjacent the inner periphery of the ring in an axial direction to urge the ring axially against the rim.
7. A wheel for transmitting a load from an elongated flexible drive element to an axle, substantially as described and illustrated herein.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA891299A ZA891299B (en) | 1989-02-20 | 1989-02-20 | A wheel for transmitting a load from an elongated flexible drive element to an axle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9002709D0 GB9002709D0 (en) | 1990-04-04 |
| GB2229250A true GB2229250A (en) | 1990-09-19 |
Family
ID=25579606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9002709A Withdrawn GB2229250A (en) | 1989-02-20 | 1990-02-07 | A wheel for transmitting a load from an elongated flexible drive element to an axle |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE1003207A5 (en) |
| FR (1) | FR2643437B1 (en) |
| GB (1) | GB2229250A (en) |
| ZA (1) | ZA891299B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19810606C2 (en) * | 1998-03-12 | 2003-06-18 | Christoph Dahl | Safety device for a round steel chain |
| FR2893107B1 (en) * | 2005-11-08 | 2008-08-08 | Kirpy Sa | STONE MILLS WITH POSITIVE DRIVE. |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4787261A (en) * | 1986-04-04 | 1988-11-29 | Heidelberger Druckmaschinen Ag | Device for setting a relative rotational position of a gearwheel and a ring gear which are coaxially mounted |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1343075A (en) * | 1962-10-30 | 1963-11-15 | Dodge Mfg Corp | Torque limiting device |
| DE3037890A1 (en) * | 1980-10-07 | 1982-08-19 | Chr. Mayr GmbH + Co KG, 8951 Mauerstetten | Universal fitting limited torque chain wheel hub - has adjustable thrust plate with torque adjustment |
| US4466598A (en) * | 1982-06-03 | 1984-08-21 | Dresser Industries, Inc. | Load limiting apparatus for hoists |
| DE8805824U1 (en) * | 1988-05-03 | 1988-07-14 | Ktr Kupplungstechnik Gmbh, 48432 Rheine | Shaft coupling with overload protection |
-
1989
- 1989-02-20 ZA ZA891299A patent/ZA891299B/en unknown
-
1990
- 1990-02-07 GB GB9002709A patent/GB2229250A/en not_active Withdrawn
- 1990-02-15 FR FR9001834A patent/FR2643437B1/en not_active Expired - Fee Related
- 1990-02-19 BE BE9000177A patent/BE1003207A5/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4787261A (en) * | 1986-04-04 | 1988-11-29 | Heidelberger Druckmaschinen Ag | Device for setting a relative rotational position of a gearwheel and a ring gear which are coaxially mounted |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9002709D0 (en) | 1990-04-04 |
| FR2643437B1 (en) | 1995-06-30 |
| ZA891299B (en) | 1989-11-29 |
| BE1003207A5 (en) | 1992-01-14 |
| FR2643437A1 (en) | 1990-08-24 |
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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) |