GB2027490A - An oscillating mounting for a fan or the like - Google Patents
An oscillating mounting for a fan or the like Download PDFInfo
- Publication number
- GB2027490A GB2027490A GB7831841A GB7831841A GB2027490A GB 2027490 A GB2027490 A GB 2027490A GB 7831841 A GB7831841 A GB 7831841A GB 7831841 A GB7831841 A GB 7831841A GB 2027490 A GB2027490 A GB 2027490A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mounting
- shaft
- pivot shaft
- arm
- fan
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/10—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provisions for automatically changing direction of output air
- F04D25/105—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provisions for automatically changing direction of output air by changing rotor axis direction, e.g. oscillating fans
-
- 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
- F16H21/00—Gearings comprising primarily only links or levers, with or without slides
- F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
- F16H21/40—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for interconverting rotary motion and oscillating motion
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A frame 10 journals a pivot shaft 11 carrying a mounting for the fan. For safety, the shaft 11 is oscillated via a friction clutch arm 22 by means of a motorised crank drive 14, 15, 18, 20. The shaft 11 carries a radial stop arm 36 which moves between a pair of fixed stops 40, 42 on the frame 10. If the fan is impeded, relative rotary slipping movement occurs between the shaft 11 and the arm 22, which normally imparts only a light friction drive to the shaft. The stops 40, 42 bring about further relative slipping movement between the arm 22 and the shaft 11, when the fan is released, to restore the angular position of the arm relative to the shaft and ensure that the fan always oscillates in the sector in which it is initially directed. <IMAGE>
Description
SPECIFICATION
Oscillating mounting for a fan or the like
The present invention relates to an oscillating mounting for a fan or the like.
Such mountings are generally known for fans and permit the fan to direct a stream of air in a sector. Usually the mounting is driven by the fan motor, or by the action of the fan impeller.
A large, oscillating, free standing fan can be a source of danger to persons coming into contact with the fan, even if the fan is enclosed in a casing, and a similar consideration applies, although to a lesser extent, if the fan is wall mounted.
According to the present invention, an oscillating mounting for a fan or the like has a motorised, crank drive adapted to oscillate a pivot shaft rotationally to-and-fro about the longitudinal axis of the shaft, via a friction clutch means, and stop means limiting the movement of a point on the pivot shaft within a predetermined sector.
The pivot shaft mounts the fan or the like, in use of the mounting, and the fan is oscillated about the pivot shaft longitudinal axis in a sector determined by the pivot means. If an impediment is encountered by the fan or the mounting during its oscillation, the motorised crank drive continues to rotate but the friction clutch means slips so that the fan and mounting ceases its oscillating movement. When the impediment is removed, the friction clutch means again drives the pivot shaft in one direction or the other. At the recommencement of the drive the relative angular position of the driving and driven elements of the friction clutch means may well have changed, compared with their relative angular positions when the fan or the mounting was impeded.
The pivot shaft is driven in rotation in one direction or the other until the stop means operates to halt the oscillating movement of the mounting when the angular sweep of the mounting reaches one end of its predetermined sector. The friction clutch means again slips until the oscillating drive imparted to the mounting reverses its direction, whereupon the oscillating drive recommences and the fan is oscillated to-and-fro in the sector determined by the stop means, as before.
It will be appreciated that the stop means may predetermine a wider angled sector than that in which the mounting is actually oscillated by the crank drive, in which case the stop means will act to ensure that the mounting always oscillates within the sector determined by the stop means.
The motorised crank drive of the mounting may be conveniently enclosed in a suitable housing and no problem arises from the fact that this is continuously driven.
A specific embodiment of the present invention will now be described by way of example, and not by way of limitation, with reference to the accompanying drawing which is a diagrammatic illustration of a portion of a mounting in accordance with the present invention and which shows the motorised crank drive, the clutch means, the pivot shaft and the stop means of the mounting.
With reference then to the accompanying drawing, the mounting comprises a frame 10 in the form of a pedestal intended to stand freely on a floor or in the form of a wall or a ceiling mounting bracket of any convenient form. The frame 10 journals a pivot shaft 11 in suitable bearings (not shown) and the shaft 11 carries a platform (not shown), which may be adjustable with respect to the horizontal, in the case where the frame 10 is a pedestal, for mounting say a fan, again in any convenient fashion, or say a yoke for hingeably supporting a fan above floor level. In either event it is supposed that the pivot shaft 11 will be orientated with its longitudinal axis 1 2 disposed vertically, but this is not essential.An electric motor 1 4 drives a double worm and worm wheel speed reduction gear box 1 5 the output drive shaft 1 6 of which continuously rotates at a slow speed of, for example, 3 to 4 revolutions per minute. Shaft 1 6 mounts a crank arm 1 8 connected by means of a rod 20 to oscillate a friction clutch arm 22 mounted on the pivot shaft 11. The arm 22 has a bore 26 which, in the unassembled state of the arm 22, is a freely sliding fit on the pivot shaft 11. The bore 26 receives the pivot shaft to mount the arm on the shaft. The arm is bifurcated at one end, the split extending in the longitudinal direction of the bore 26, as at 30, the split, which has spaced walls, opening into the bore 26.A clamping bolt and nut 32 mounted in aligned holes in the bifurcations of the arm and extending transversely with respect to the longitudinal axis 1 2 of the shaft 11 tightens the bore 26 about the shaft 11 to enable the arm 22 to impart a light friction drive to the shaft 11 when the arm 22 is oscillated to-and-fro. The shaft 11 carries a radially extending stop arm 36 which oscillates with the shaft between a pair of spaced stops 40 and 42 carried by the frame 1 0. The longitudinal axis of the stop arm 36 intersects the periphey of the shaft 11 at a point the movement of which is limited to a predetermined sector a by the engagement of the arm 36 with the stops 40 and 42 respectively.Preferably, the arm 36 sweeps a sector of an angle a little less than a so that, in the normal course the arm 36 oscillates toand-fro between the stops 40 and 42 without actually making contact with the stops.
Whilst the arm 36 is illustrated as extending at 180 with respect to the arm 22 this is not essential. The arm 36 and the stops 40 and 42 may be positioned in any convenient angular orientation with respect to the axis 1 2 of the shaft 11.
The arm 22 is preferably composed of an acetal copolymer such as that marketed under the Trade Mark "KEMATEL" but other materials such as P.T.F.E. or even aluminium are thought to be suitable.
The parts illustrated in the drawing are enclosed in a suitable housing from which the shaft 11 projects, the fan mounting platform or yoke being carried by the shaft outside the housing.
An oscillating mounting in accordance with the present invention has general application for mounting any equipment required to be oscillated, for example, to cause any liquid or gaseous discharge to sweep a desired sector to be treated.
Claims (11)
1. An oscillating mounting for a fan or the like including a motorised, crank drive adapted to oscillate a pivot shaft rotationally to-and-fro about the longitudinal axis of the shaft, via a friction clutch means, and stop means limiting the movement of a point on the pivot shaft within a predetermined sector.
2. An oscillating mounting as claimed in claim 1 in which the stop means predetermines a wider angle sector than that in which the pivot shaft is oscillated by the crank drive.
3. An oscillating mounting as claimed in claim 1 or 2 in which the motorised crank drive is enclosed in a housing.
4. An oscillating mounting as claimed in any preceding claim comprising a pedestal frame journalling the pivot shaft.
5. An oscillating mounting as claimed in any one of claims 1 to 4 comprising a mounting bracket journalling the pivot shaft.
6. An oscillating mounting as claimed in claim 4 or 5 in which said pivot shaft carries an adjustable mounting bracket or platform for mounting the fan or the like.
7. An oscillating mounting as claimed in any preceding claim in which the motorised crank drive comprises an electric motor connected to drive a double worm and worm wheel speed reduction gear box the output drive shaft of which mounts a crank arm.
8. An oscillating mounting as claimed in any preceding claim in which the friction clutch means comprises a friction clutch arm mounted on the pivot shaft, the pivot shaft passing through a bore in said friction clutch arm and being a friction fit in the bore.
9. An oscillating mounting as claimed in claims 7 and 8 in which said crank arm is connected to said friction clutch arm by a connecting rod.
10. An oscillating mounting as claimed in any preceding claim in which the stop means comprising a radially extending stop arm carried by said pivot shaft to oscillate between a pair of fixed stops.
11. An oscillating mounting for a fan or the like substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7831841A GB2027490B (en) | 1978-08-01 | 1978-08-01 | Oscillating mounting for a fan or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7831841A GB2027490B (en) | 1978-08-01 | 1978-08-01 | Oscillating mounting for a fan or the like |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2027490A true GB2027490A (en) | 1980-02-20 |
| GB2027490B GB2027490B (en) | 1982-10-06 |
Family
ID=10498794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7831841A Expired GB2027490B (en) | 1978-08-01 | 1978-08-01 | Oscillating mounting for a fan or the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2027490B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010042958A2 (en) * | 2008-10-06 | 2010-04-15 | Chi Tran | Pedestal fan with fan grill comprising diverting surface and wind direction changing mechanism |
-
1978
- 1978-08-01 GB GB7831841A patent/GB2027490B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010042958A2 (en) * | 2008-10-06 | 2010-04-15 | Chi Tran | Pedestal fan with fan grill comprising diverting surface and wind direction changing mechanism |
| WO2010042958A3 (en) * | 2008-10-06 | 2010-12-02 | Chi Tran | Pedestal fan with fan grill comprising diverting surface and wind direction changing mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2027490B (en) | 1982-10-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5426417A (en) | Oscillating warning light for emergency vehicle | |
| US5024112A (en) | Gyroscopic apparatus | |
| US2547922A (en) | Portable motor operated hand scroll saw | |
| US2478445A (en) | Baby cradle rocked by electricity | |
| GB2027490A (en) | An oscillating mounting for a fan or the like | |
| US3656974A (en) | Power driven stirrer | |
| KR970064889A (en) | How to Assemble Tire Forming Device and Tire Component | |
| US4020703A (en) | Swing drive, in particular a reciprocating drive for moulds in continuous casting plants | |
| US4884465A (en) | Device for obtaining a directional centrifugal force | |
| US3917386A (en) | Devices for imparting a scanning motion to mirrors and the like | |
| US4538660A (en) | Rotary drive device for mandrel-carrying arbors of tire dismounting machines | |
| BR102019026343A2 (en) | windshield wiper assembly, aircraft, windshield wiper system, and method for controlling the sweep of a windshield wiper | |
| US4126050A (en) | Vibrator | |
| SU1136858A1 (en) | Device for vibration cleaning of articles | |
| JPS6139211Y2 (en) | ||
| SU1098586A1 (en) | Unbalance vibration exciter | |
| SU1369830A1 (en) | Vibration exciter | |
| JPH0433483Y2 (en) | ||
| US1688052A (en) | Electric heater fan | |
| US1214198A (en) | Electric fan. | |
| US1196256A (en) | Electric fan. | |
| SU1715928A1 (en) | Self-propelled vibration device | |
| GB2151286A (en) | Surface vibrator for compacting freshly-placed concrete | |
| SU373088A1 (en) | BSEOUJENAYA | |
| DE68904279D1 (en) | DEVICE FOR CONTROLLING THE ANGLE POSITION OF AN ACTUATOR DRIVING A ROTATING DRIVE SHAFT. |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |