GB1564896A

GB1564896A - Ventilator

Info

Publication number: GB1564896A
Application number: GB30691/75A
Authority: GB
Original assignee: Mac Gregor International SA
Current assignee: Mac Gregor International SA
Priority date: 1975-07-22
Filing date: 1975-07-22
Publication date: 1980-04-16
Also published as: BR7604768A; NO762521L; JPS5241387A

Description

(54) VENTILATOR (71) We, MACGREGOR INTERNATIONAL S.A., of 7 St. Jakobstrasse, Basle, Switzerland, a Swiss Company, 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 ventilators and more particularly but not solely to ventilators for ships.

According to one aspect of the invention there is provided a ventilator comprising a tubular wall portion adapted at one end to permit axially rotatable retentive mounting on a flat surface, a cowl comprising a lid, which cowl is pivotally mounted on the tubular wall portion to permit pivotal movement between a closed position with the lid overlying the other end of the tubular wall portion and an open position in which it is pivoted away from said other end of the wall portion, and a support arm for the cowl pivotally mounted at one end on the wall portion or cowl, wherein the arm and the cowl or wall portion respectively are provided with interengageable formations, the arrangement being such that upon pivotal movement of the cowl into the open position the formation on the arm is caused to engage the formation on the cowl or wall portion to retain the lid against closure.

The formation on the cowl or wall portion may comprise a slot or may be of the form of the tooth of a ratchet wheel.

The adaptation for permitting rotatable mounting may comprise an annular flange.

The annular flange may extend radially outwardly from the tubular wall portion.

Retaining means may be provided for effecting retentive closure of the cowl.

The invention may also include a ventilator as hereinbefore defined rotatably mounted on a deck of a ship or the roof of a building or vehicle by means of the adaptation at one end of the tubular wall portion so that the tubular wall portion encloses a ventilation aperture in the ship building or vehicle.

In order that the invention and its various other preferred features may be understood more easily, an embodiment thereof will now be described, by way of example only, with reference to the drawings, wherein: - Figure 1 is a plan view of a ventilator constructed in accordance with the invention mounted on the deck of a ship, and Figure 2 is a cross sectional view on the line x-x of Figure 1.

In the drawings the ships ventilator has a cowl shown generally as 10. The cowl has a circular closure plate 11 shown in a closed position by solid lines and a portion of which is shown in an open position by broken lines. The plate 11 is of diameter greater than a cylindrical coaming 12 which projects from a hole in the deck 13 of a ship or alternatively in a hatch cover of a ship and the plate 11 is provided with a wall 14 extending circumferentially of the plate to surround the coaming when in the closed position.

The closure plate 11 is provided with two support plates 15 extending substantially at right angles to and joined to the external face of the closure plate. The plates 15 are parallel and extend beyond the periphery of closure plate and are joined to the wall 14.

The plates 15 provided with elongate or oval in line bores 16 for permitting pivotal mounting on a shaft 17.

The closure plate 11 is pivotally mounted on a cylindrical frame shown generally at 18 which has a diameter greater than the coaming. The frame 18 has a radially extending flange 20 for sliding engagement with an annular retaining guide 21 which encircles the coaming and which is secured to the deck of the ship or to the hatch cover.

Guide 21 permits rotation of the frame 18 and anti-friction pads 22, on which the flange 20 runs, are provided on the deck.

Frame 18 is provided with two spaced parallel bearing plates 23 extending outwardly thereof and having coaxial bores for supporting the shaft 17 permitting the pivotal mounting of the closure plate 11.

The support plates 15 of the closure plate 11 are provided with a handle 24 extending therebetween at their ends disposed near the centre of the closure plate. The handle serves for raising or opening the closure plate. The closure plate is provided near its periphery on its outer face with a pivotal mounting 25, disposed between the support plates 15, for a locking/quick release handle 26. The handle is of substantially "T" shaped form having a trunnion 27, at the lower end of the upright of the "T" form, which trunnion is pivotably mounted in the mounting 25.

Two plates 28 having ratchet like teeth 29 are mounted on the frame 18 and extend outwardly and are parallel to the bearing plates 23 but spaced inwardly of the support plates 15. The pivotal mounting of the support plates 15 on the bearing plates 23 by means of the shaft 17 permits engagement of opposite arms of the handle 26 with the ratchet teeth 29 upon opening of the closure plate 11 by means of the handle 24. The arms of the handle 26 drop into engagement with the teeth 29 under the action of gravity as the closure plate 11 is raised and prevent closure upon release of the cover plate by virtue of the engagement of the handle with the teeth. Quick release and closure of the cover plate from an open position can be effected by upward and outward pressure on the handle 26, e.g. by banging with the hand or convenient heavy implement.This is a particularly useful feature in reducing the spread of fire in the hold of a ship by enabling simple and instant closure to prevent access of air to the fire. This feature complies with " closing of openings" regulations relating to the fire-fighting apparatus prescribed for carrying by a ship.

As can be seen in the drawing the teeth 29 in this particular embodiment are arranged to hold the closure plate 11 open at angles of 10, 40, and 70" to a horizontal plane but could of course be arranged at any other suitable angles to the horizonal plane. With only small angular opening of the closure plate the coaming remains shrouded by the wall 14.

To provide for secure closure of the plate 11 over the coaming 12 one or more slotted plates and co-operating toggles 31 are provided. In the embodiment several slotted plates 30 are mounted round the circumference of the closure plate 11 and extend radially outwardly thereof. A toggle 31 for each slotted plate 30 is pivotally mounted on a respective flange 32 on the frame 18. The toggles 31 co-operate with a respective slotted plate 30 to releasably retain the closure plate in a closed position and permit screwed down secure closure by means of wing nuts 33 as will be evident from Figure 1.

The cowl is provided with a resilient seal in the form of a sealing ring 34 of for example rubber, located in an annular channel, disposed adjacent the wall 14 of the closure plate 11, which seal engages the upper edge of the coaming when the cowl is closed. The ring 34 is compressed by the weight of the closure plate to provide an effective air seal and is further compressed to enhance the seal when the closure plate is screwed down by the wing nuts 33. The closure plate is movable downwardly, by virtue of the play in the oval bores 16, on shaft 17 and the overall compression of the ring 34 is limtied by engagement of the lower end of the wall 14 with one or more mild steel blocks 35 mounted on the frame 18 as will be seen in the drawing. This prevents over-compression of the resilient ring.

The cowl may be rotated to direct an opening, formed between the closure plate and coaming when the closure plate is open, in any desired radial direction, e.g. towards the wind. As the toggles 31 are moved round concomitantly in alignment with their respective slotted plates when the cowl is rotated in its retaining guide 21 the cowl can be closed and cleated down when the opening is disposed in any radial direction.

This again is an advantageous feature of this embodiment.

In normal circumstances the cowl will remain in its directionally adjusted position by virtue of the friction induced in its rotatable coupling with the deck via the guide 21. However, any suitable securing arrangement could be provided for fixing the cowl in the adjusted position against further rotation.

The embodiment described is susceptible to various modifications within the scope of the appended claims for example: the wall forming the frame 18 need not be cylindrical but may be of any other suitable cross sectional tubular shape, e.g. rectangular. Although in the embodiment described the plates 28 are mounted on the wall portion 18 and the handle 26 is pivotally mounted on the lid or closure plate 11 it will be appreciated that the handle could be mounted on the wall portion and the plates 28 could be mounted on the lid.

The ratchet like teeth 29 are particularly advantageous in securing the lid or closure plate 11 in the open position but it will be appreciated that alternative formations for mutual engagement between the handle and plates 28 could be effected for example the plate could be provided with slots in its periphery instead of the ratchet teeth.

Although the ring 34 is shown as sealing the closure plate 11 on a vent coaming 12 it would be possible to arrange for the seal to be between the closure plate 11 and the frame 18.

WHAT WE CLAIM IS: 1. A ventilator comprising a tubular wall portion adapted at one end to permit axially rotatable retentive mounting on a flat surface, a cowl comprising a lid, which cowl is pivotally mounted on the tubular wall portion to permit pivotal movement between a closed position with the lid overlying the other end of the tubular wall portion and an open position in which it is pivoted away from said other end of the wall portion, and a support arm for the cowl pivotally mounted at one end on the wall portion or cowl, wherein the arm and the cowl or wall portion respectively are provided with interengageable formations, the arrangement being such that upon pivotal movement of the cowl into the open position the formation on the arm is caused to engage the formation on the cowl or wall portion to retain the lid against closure.

2. A ventilator as claimed in Claim 1, wherein the formation on the cowl or wall portion is of the form of a tooth of a ratchet wheel.

3. A ventilator as claimed in Claim 1, wherein the formation on the cowl or wall portion is a slot.

4. A ventilator as claimed in Claim 2 or 3, wherein the tooth or slot is arranged such that when the tubular portion is mounted by said one end on a horizontal surface the tooth or slot is inclined at an angle above the horizontal to permit the formation on the arm to drop into engagement with the tooth or recess upon pivoting of the cowl to the open position.

5. A ventilator as claimed in any one of the preceding claims comprising a plurality of said formations permitting retention of the lid in a plurality of open positions with the lid at different angular dispositions relative to its closed position.

6. A ventilator as claimed in any one of the preceding Claims, wherein the adaptation permitting rotatable mounting on a fiat surface comprises an annular flange.

7. A ventilator as claimed in Claim 6, wherein the annular flange extends radially outwardly from the tubular wall portion.

8. A ventilator as claimed in any preceding claim including retaining means for effecting retentive closure of the cowl.

9. A ventilator as claimed in Claim 8, wherein the retaining means comprises at least one securing device engageable between the wall portion and the lid.

10. A ventilator as claimed in Claim 9, wherein the or each securing device comprises a toggle pivotally mounted on the wall portion and releasably engageable with the lid.

11. A ventilator as claimed in Claim 10, wherein the lid is provided at its periphery with a projecting slotted plate for each toggle for admitting the toggle to effect retention of the lid in the closed position.

12. A ventilator as claimed in any one of the preceding Claims wherein said formation(s) on the cowl or wall portion are provided along the edge of a plate extending therefrom.

13. A ventilator as claimed in Claim 12, comprising an additional plate provided with identical formation(s) mounted on the cowl or wall portion in side by side spaced disposition with formations in alignment and wherein the arm is locatable between the plates and is provided with formations for simultaneous engagement with a formation on each of the plates.

14. A ventilator as claimed in any one of the preceding Claims comprising a resilient seal arranged to extend around the periphery of the lid for sealing engagement with the edge of a coaming of a ventilation aperture.

15. A ventilator as claimed in any one of the preceding Claims rotatably mounted on a flat surface by means of the adaptation at one end of the tubular wall portion so that the tubular wall portion encircles a ventilation aperture in the surface.

16. A ventilator as claimed in Claim 15, rotatably mounted on the deck of a ship.

17. A ventilator substantially as described herein with reference to, and as illustrated in, the drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. it would be possible to arrange for the seal to be between the closure plate 11 and the frame 18. WHAT WE CLAIM IS:

1. A ventilator comprising a tubular wall portion adapted at one end to permit axially rotatable retentive mounting on a flat surface, a cowl comprising a lid, which cowl is pivotally mounted on the tubular wall portion to permit pivotal movement between a closed position with the lid overlying the other end of the tubular wall portion and an open position in which it is pivoted away from said other end of the wall portion, and a support arm for the cowl pivotally mounted at one end on the wall portion or cowl, wherein the arm and the cowl or wall portion respectively are provided with interengageable formations, the arrangement being such that upon pivotal movement of the cowl into the open position the formation on the arm is caused to engage the formation on the cowl or wall portion to retain the lid against closure.