GB1573202A

GB1573202A - Plant enclosure

Info

Publication number: GB1573202A
Application number: GB35835/75A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1975-12-21
Filing date: 1975-12-21
Publication date: 1980-08-20
Also published as: NL7614174A; DE2657755A1

Description

(54) IMPROVEMENTS IN OR RELATING TO A PLANT ENCLOSURE (71) We, DEREK THOMAS MURRAY RYNHART, of 38 Church Street, Appleby, Magna, Nr. Burton on Trent, and STANLEY ARTHURBLOXHAM, of 97 Hazlewood Lane, London N. 13, both of British Nationality, 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:- The present invention relates to a plant enclosure, and more particularly to a plant enclosure intended to be located out of doors and suitable for accommodating a variety of plants.

A typical prior proposed plant enclosure comprises a conventional greenhouse which has a generally rectangular plant and has a vertical side walls and a pitched or sloping roof. The entire structure is formed of wood or metal and is provided with panes of glass or other transparent material. A door is provided and a path extends the length of the greenhouse to permit access to the various plants.

Such a prior proposed greenhouse or glasshouse suffers from several disadvantages. Although the floor area of the greenhouse or glasshouse may be relatively large, since a path must be provided within the greenhouse to permit access to plants within the greenhouse. the space within the greenhouse is not utilised economically. Furthermore the volume within the greenhouse is relatively large. and the overall surface area of the greenhouse is relatively large, and con sequently. if the greenhouse is to be heated, for example during the winter months, a heater of considerable capacity must be utilised.

A further disadvantage of such greenhouse is that when it is desired to ventilate the greenhouse it is necessary to open doors or windows to permit air to flow into or through the greenhouse, and if the doors or windows are not opened at the appropriate time the temperature within the greenhouse can rise to such an extent that plants within the greenhouse become damaged.

The present invention seeks to provide the greenhouse in which the above described disadvantages of a prior proposed greenhouse are reduced or obviated, and also seeks to provide a device for operating a ventilator.

According to one aspect of this invention there is provided an enclosure for plants comprising a base, means supporting a housing over said base and means for raising all or part of said housing relative to the base to provide openings substantially at the bottom and at the top of said housing to permit ventilation of the enclosure when desired or when the temperature therein exceeds a predetermined temperature.

According to another aspect of this invention there is provided an enclosure for plants comprising a base, means supporting a housing over said base and means responsive to the temperature within the closure for automatically raising all or part of said housing relative to the base to provide openings substantially at the bottom and at the top of said housing to permit ventilation of the enclosure when the temperature therein exceeds a predetermined temperature.

Conveniently the base may comprise a bowl shaped container having a side wall engaging the housing when the housing has not been raised, but in an alternative embodiment of the invention the base may comprise a member adapted to be located in soil or the like to form an upstanding wall engaging the housing when the housing has not been raised. In the first embodiment of the invention the plant enclosure may be a fully transportable unit and may be located on patio, balcony or the like, whereas in the second embodiment of the invention the enclosure will be located in a garden or allotment on a bed of soil or the like.

Preferably the enclosure comprises a vertical support pole, rigidly mounted relative to the base and supporting said housing, said pole comprising said means for raising all or part of said housing, and advantageously the housing may comprise a roof or support member and a transparent or translucent flexible member suspended from the periphery of the roof or support member and contacting the base when the housing is not raised, the roof or support member including ventilator openings that are closed when the housing is not raised, and that are opened when the housing is raised.

The means for raising all or part of the housing may be manually operated, where preferably the raisin means comprise two nested tubes formed rom metals with different coefficients of thermal expansion, a hydraulic piston assembly actuated on differential expansion of said tubes to provide hydraulic fluid under pressure in response to a rising temperature and a further piston assembly adapted to raise all or part of said housing, to enable at least part of the housing to be raised automatically.

In one embodiment the hydraulic system may comprise a master piston and a slave piston, said master piston being secured to a first metal tube of metal having a relatively low coefficient of thermal expansion, which tube is secured, at the end thereof remote from the master piston, to an outer coaxial second tube of a metal of relatively high coef ficient of thermal expansion and which forms a cylinder for said master piston, there being means for conducting hydraulic fluid from said cylinder for said master piston to said slave piston, said slave piston being a smaller surface area than the master piston. The slave piston may be mounted within the metal tube having a relatively low coefficient of thermal expansion, a bore being provided in the tube communicating with the cylinder of the master piston.

Advantageously a further tube of metal of relatively coefficient of thermal expansion may be provided, said further tube being secured to the point of connection of said first and second tubes and also engaging a movable bung which is movable within the cylinder of the master piston.

Preferably the hydraulic system contains a hydraulic fluid of relatively high coefficient of thermal expansion, such as isopropyl alcohol or ethyl alcohol. Preferably the first tube is of steel and the second tube and a further tube are of aluminium.

Advantageously one or more containers may be mounted on said central support pole. each container having a tubular portion accommodating the pole, the tubular portion having a tapering internal bore, a resilient ring being mounted on the pole and being wedged in the tapering bore to retain the container in position.

In order that the invention may be more readily understood and so that further features thereof may be appreciated the invention will now be described by way of example with reference to the accompanying drawings, in which: Figure 1 is a perspective view from above of a plant enclosure provided with automatic ventilating means in accordance with the invention, Figure 2 is a perspective view from below the plant enclosure of Figure 1 in a different position, and Figure 3 is a cross sectional view of part of the central tube of the plant enclosure of Figures 1 and 2.

Referring to Figures 1 and 2 a plant enclosure 1 comprises a base 2 which is formed as a moulding of a plastics material.

The base is circular and has a peripheral upstanding side-wall 3, and constitutes an open topped bowl shaped container. The uppermost part of the side wall flares outwardly slightly. Provided in the lower part of the base are six small apertures 4 each of which terminates in a respective recess 5 formed in the lowermost surface of the base.

An upwardly directed tubular projection 6 is provided in the centre of the base, which receives and engages an aluminium tube 7.

The tube 7 extends upwardly above the base for a considerable distance and mounted on the top of the tube 7 is a disc 8 formed of a transparent material which extends radially outwardly away from said tube. The radially outermost part of the disc 8 is deflected downwardly. The disc 8 may be formed of a plastics material and strengthening ribs may be provided. The disc 8 is provided with a central socket adapted to engage with the uppermost portion of the aluminium tube 7.

Provided adjacent the periphery of the disc 8 are six apertures 9, and rot proof suspension strings are on the said disc 8 by passing the strings through said apertures and knotting strings. The other end of each string may be passed through one of the apertures 4 provided in the base as hereinbefore described, and again the string may be knotted, the knot resting in the recess 5 formed in the lowermost surface of the base of the container. The strings provide rigidity for the described assembly.

Mounted on the aluminium tube 7 between the base and the disc are four separate bowl shaped containers 11 each formed of a moulded plastics material. Each container is in the form of a circular container having a circular base and an upstanding peripheral wall, there being a tubular projection 12 extending upwardly from the middle of the container which accommodates the aluminium tube 7. The bore through each container is a tapering bore and a resilient rubber ring is mounted on the alumnium tube at the position where each container is to be located, the rubber ring being engaged between the conical portion of the bore and the tube, thus supporting the container in position. It will be appreciated that any number of such containers may be provided, although it is envisaged that normally the maximum number of such containers will be five.

The base of each container 11 is not flat, but instead the bases slope downwardly in a radially inward direction. Thus each base has a slope corresponding to that of an inverted cone, the portion of the base adjacent the tube 7 being lower than the portion of the base adjacent the peripheral upstanding wall.

A round roof or support member 13 is movably mounted above said disc 8 and a cylindrical resilient plastics material sleeve 14 is supported by the outer periphery of the support member 13. The sleeve may be formed of high grade ultra-violet connective P.V.C. with a predetermined shading characteristic. The plastics material sleeve 14 extends substantially vertically downwardly from the outer periphery of the support member 13 towards the base 2. The lowermost edge of the sleeve 14 is scalloped, being provided with semi-circular recesses 15 separated by rectangular fingers 16. The fingers 16 are provided with stop fasteners and each embrace a ring 18 which entirely surrounds the base 2. The ring 18 is formed of metal tube or the like and acts to weigh down the sleeve 14.A full length zip 19 is provided extending from a point adjacent the support member 13 to a point adjacent the base 2, the zip being openable to permit access to the interior of the plant enclosure. The lower edge of the sleeve between the fingers may, in an alternative embodiment, be cut away rectangularly, so that the lower edge of the housing has a castellated appearance.

The roof or support member 13 is moulded from a plastics material, which may be opaque, or which may be transparent or translucent. The support member 13 is of circular shape in plan, and is provided with a central circular upwardly projecting portion 20. Thus the support member 13 has a resemblance to a flat brimmed hat. Air vents 21 are formed in the side walls of the projecting portion 20, the vents being in the form of rectangular apertures covered by bird-proof netting or mesh. Recessed gutters 22 are formed in the uppermost surface of the upwardly projecting portion 20 to direct rain water or the like falling on the support member 30 away from the air vents 21.The diameter of the upwardly projecting portion 20 is substantially the same as that of the disc 8, and the inner surface of the lower part of the upwardly projecting portion 20 is shaped sealingly to engage with the downwardly deflected peripheral portion of the disc 8.

Means are provided for raising the roof or support member 13 relative to the disc 8 when the temperature within the housing exceeds a predetermined level. As the roof or support member 13 is raised the scalloped portion of the plastics material sleeve 14 between the fingers 16 will rise above the level of the outwardly flared upper edge of the side wall 3 provided on the base 2, thus permitting ventilating air to flow into the lower region of the housing and to escape from the top of the housing. Thus the housing will be ventilated. The upper part of the side wall 3 is flared so that the side wall will sealingly engage the sleeve 14 before the support member 13 is raised.This prevents undesired ventilation of the housing, and also any consideration formed on the inner surface of the sleeve will meet the flared portion of the side wall when running down the sleeve, and will be returned to the container forming the base 1.

In the illustrated embodiment of the invention the aluminium tube is formed of two interconnected sections and mounted within the upper section of the aluminium tube 7 is a steel tube 23, the steel tube 23 being anchored to the aluminium tube 7 adjacent the uppermost portion of the aluminium tube 7, by means of a lock nut 24 engaging a threaded end portion of the tube 23 and retaining, via a washer 25, an aluminium bung 26 provided with an 0 ring 27 sealing against the inner surface of tube 7 and a flange 28 engaging the end of tube 7.

The lower end of the steel tube 23 passes through a central aperture in a movable sealing bung 29 which is mounted within the aluminium tube 7. The bung 29 is formed of nylon and is provided with sealing O-rings 30 engaging the inner surface of aluminium tube 7, and sealing O-rings 31 engaging the outer surface of steel tube 23. Secured to the lowermost end of the steel tube 23 by means of a set screw 32 and a sealing washer 33 which together seal the end of tube 23 is a nylon piston member 34 which is provided with sealing O-rings 35 which engage with the interior wall of the aluminium tube 7. An aperture 36 is formed within the steel tube adjacent the upper surface of the piston member 34.

Slidably mounted within the upper end of the steel tube 23 is a slave piston member 37 provided with sealing O-rings 38. The piston member 37 is secured to the roof or support member 13 by means of a lock nut 29 and washers 40. The interior surfaces of the steel tube 23 that engage the piston may be chrome plated.

A second aluminium tube 41 is provided which is coaxial with the steel tube 23 and which extends from the bung 26 to the upper surface of the movable bung 29, a nylon washer 42 being located between the end of the tube 41 and bung 29.

The space above the piston 34 and beneath the movable bung 21 within aluminium tube 7 and the interior of the steel tube 23 are filled with a hydraulic fluid, and the hydraulic fluid is preferably a fluid which has a great degree of thermal expansion, such as ethyl alcohol or isopropyl alcohol.

In operation of the device the plant enclosure would be assembled as shown in Figures 1 and 2, the two portions of tube 7 being connected together, the various containers, the various containers 2, 11 being filled with a soil-less compost, peat or any other suitable growing medium. Seed or plants may then be sown in the various containers, and it is envisaged that plants such as tomatoes may be grown with their roots located in the base 2, the plants being supported by the suspension strings 10, and other plants such as lettuces, spring onions, radishes or the like (i.e. plants which do not grow to an excessive height) may be planted within the remaining containers 11 mounted on the aluminium tube 7. The plants may be watered in the usual way.It is envisaged that no drain apertures will be needed in the containers, although it will be appreciated that such drain apertures may be provided if necessary.

The roof or support member 13 and the sleeve 14 may be rotated as a whole, the piston member 37 merely rotating within the steel tube 23. Thus with the zip 19 in the open position and with one or more of the fingers 16 released from the ring 18 access may be gained to all the plants contained within the plant enclosure. Fasteners 43 are provided on sleeve 14 to which fingers 16 may be connected to facilitate access to the plant enclosure.

If the zip 18 is closed and the temperature within the housing rises the aluminium tube 7 and the steel tube 23 will both expand, but the aluminium tube 7 will expand more than the steel tube 23 since aluminium has a higher coefficient of thermal expansion than steel. Thus the point of connection of the aluminium tube 7 and the steel tube 23 at the uppermost ends of those tubes will rise, and since the coefficient of the expansion of the steel tube 23 is not equal to the coefficient of expansion of the aluminium tube 7 the piston head 34 contained within the aluminium tube 7 will also rise, thus comprising the hydraulic fluid contained within the aluminium tube 7, and thus forcing compressed hydraulic fluid up the steel tube 23.This hydraulic fluid will force the piston 37 contained in the top of the steel tube upwardly, thus driving the roof or support member 13 away from the disc 8 and thus effectively opening the ventilation apertures 21 provided at the top of the plant enclosure. As the roof or support member rises further, as the result of a very high temperature the scalloped portions 15 of the sleeve 14 located between the fingers 16 will rise above the level of the base 2, thus permitting through flow ventilation of the housing.

It is envisaged that the hydraulic fluid may be a fluid such as ethyl alcohol which, in itself, has a high thermal coefficient of expansion, and the use of such a fluid will tend to reinforce the above described effect, thus causing the cruciform member to be moved away from the disc member by a considerable distance when the temperature rises. Also, the action of the second aluminium tube 41 reinforces the effect since when tube 41 is warm, the tube will expand, forcing movable bung 29 downwardly relatively to the point of connection of the tubes 7 and 23.

When the temperature within the plant enclosure falls the hydraulic fluid will contact, and also the various steel and aluminium tubes described above will contact, returning the plant enclosure to its initial condition in which the roof or support is in a lowered position engaging sealingly the inner part of the portion 20 of the roof or support member, thus closing the air vents 21, and in which the scalloped portions of the tube 14 are below the rim of the container 2.

If the hydraulic fluid contacts by a large amount the movable bung 29 will move to accommodate such contraction, the bung 29 moving away from the end of the aluminium tube 41 and thus preventing the formation of a vacuum or partial vacuum over the hydraulic fluid.

When the interior of the plant enclosure is cool there is no need for ventilation, and with all the air vents 21 closed, as described above, moisture will be conserved within the plant enclosure, as in a bottle garden. Moisture condensing on the interior of sleeve 14 will run down the sleeve, down the flared lip of bowl 2 and into the soil or peat. Moisture condensing on the under-surfaces of containers 11 will run towards the central tube 7, because of the shape of the under-surfaces of the containers, and will run down the tube into the next container. In this way the formation of large drops of water which may drip into lower container damaging seedlings or the like is prevented.

As the temperature within the plant enclosure rises, so the ventilation provided is increased. Initially the air vents 21 are opened, and if this provides sufficient ventilation the action of the hydraulic device ceases. However, if further ventilation is required, the action of the hydraulic device will continue until through flow ventilation is provided. The containers 11 or the tube 7 will then act as baffles, forming swirls of air as the ventilating air flows through the plant enclosure, thus ventilating all parts of the enclosure. As the temperature falls, so the ventilation will be reduced automatically.

It has been calculated that a plant enclosure as above described having 3 ' diameter base and an overall height of 7 ', when provided with five containers 11 will have an effective growing area of 16 square feet, a total volume of 42.5 cubic feet and a surface area of 60 square feet. A conventional greenhouse 6 'x 4 ' x7 ' to the ridge will have an effective growing area of 16 square feet, allowing for the path, but will have a volume of 120 cubic feet, and a surface area of 115 square feet. Thus whilst an enclosure as described above may be heated effectively by a heater producing 205 B.T.U's per hour, a heater producing 3415 B.T.U's per hour will be needed to provide a corresponding heating effect on the conventional greenhouse.Thus a plant enclosure as described above is more economic than a conventional greenhouse from the point of view of the space occupied and from the point of view of the energy required to heat the enclosure.

Whilst the invention has been specifically described with reference to embodiments in which the roof or support member moves upwardly automatically in response to changes of temperature within the housing, it must be appreciated that the present invention also embraces embodiments in which the roof or support is movable by other means, such as a manual device, the roof or support member then being retained in position by means of a ratchet device or the like.

Also it will be appreciated that a foot pump or hand pump may be provided to enable a compressed or pressurised medium to be provided to a piston and cylinder arrangement located in the centre of the housing, to enable the housing to be raised when the temperature therein rises.

Furthermore, it must be appreciated that whilst in the described preferred embodiment of the invention use is made of a hydraulic system which is activated in response to the expansion of various metal members due to a rise in temperature, various other heat sensitive arrangements may be provided, including a heat sensitive arrangement which is charged with a gas or liquid, the pressure of which rises rapidly when the temperature rises beyond a predetermined level, and it will be appreciated that if such an embodiment is utilised a reservoir of liquid or gas may be provided, and the housing may be lifted by a piston mounted in a tube or conduit in communication with the reservoir.

Also, in one embodiment of the invention, the plant enclosure may be directly mounted over soil, the central aluminium pole being located in an appropriate pole formed in the soil, and a removable side wall being provided to simulate the side wall of the base 2.

In such an embodiment of the invention the tube 14 may diverge so that the tube covers a larger area of soil than merely the area of the roof or support member. Such an embodiment of the invention can be used in a garden or allotment.

Reference is made to co-pending application No. 7 918 337 (Serial No. 1 573 203), divided from the present application, which relates to a device for opening a ventilator comprising master and slave pistons, and a structure comprising metals having different coefficients of expansion.

WHAT WE CLAIM IS: 1. An enclosure for plants comprising a base, means supporting a housing over said base and means for raising all or part of said housing relative to the base to provide openings substantially at the bottom and at the top of said housing to permit ventilation of the enclosure when desired or when the temperature therein exceeds a predetermined temperature.

2. An enclosure for plants comprising a base, means supporting a housing over said base and means responsive to the temperature within the closure for automatically raising all or part of said housing relative to the base to provide openings substantially at the bottom and at the top of said housing to permit ventilation of the enclosure when the temperature therein exceeds a predetermined temperature.

3. An enclosure according to claim 1 or 2 wherein said base comprises bowl shaped container having a side wall engaging the housing when the housing has not been raised.

4. An enclosure according to claim 1 or 2 wherein said base comprises a member adapted to be located in soil or the like to form an upstanding wall engaging the housing when the housing has not been raised.

5. An enclosure according to any one of the preceding claims comprising a vertical support pole, rigidly mounted relative to said base and supporting said housing, said pole comprising said means for raising all or part of said housing.

6. An enclosure according to claim 5 wherein said housing comprises a roof or support member, and a transparent or translucent flexible member suspended from the periphery of said roof or support member and contacting said base when the housing is not raised, the roof or support member including ventilation apertures that are closed when the housing is not raised, and that are opened when the housing is raised.

7. An enclosure according to claim 6 wherein a disc is mounted on said vertical pole, which contacts said roof or support member when the housing is not raised to seal the said ventilation openings, said means

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. the ventilating air flows through the plant enclosure, thus ventilating all parts of the enclosure. As the temperature falls, so the ventilation will be reduced automatically. It has been calculated that a plant enclosure as above described having 3 ' diameter base and an overall height of 7 ', when provided with five containers 11 will have an effective growing area of 16 square feet, a total volume of 42.5 cubic feet and a surface area of 60 square feet. A conventional greenhouse 6 'x 4 ' x7 ' to the ridge will have an effective growing area of 16 square feet, allowing for the path, but will have a volume of 120 cubic feet, and a surface area of 115 square feet. Thus whilst an enclosure as described above may be heated effectively by a heater producing 205 B.T.U's per hour, a heater producing 3415 B.T.U's per hour will be needed to provide a corresponding heating effect on the conventional greenhouse.Thus a plant enclosure as described above is more economic than a conventional greenhouse from the point of view of the space occupied and from the point of view of the energy required to heat the enclosure. Whilst the invention has been specifically described with reference to embodiments in which the roof or support member moves upwardly automatically in response to changes of temperature within the housing, it must be appreciated that the present invention also embraces embodiments in which the roof or support is movable by other means, such as a manual device, the roof or support member then being retained in position by means of a ratchet device or the like. Also it will be appreciated that a foot pump or hand pump may be provided to enable a compressed or pressurised medium to be provided to a piston and cylinder arrangement located in the centre of the housing, to enable the housing to be raised when the temperature therein rises. Furthermore, it must be appreciated that whilst in the described preferred embodiment of the invention use is made of a hydraulic system which is activated in response to the expansion of various metal members due to a rise in temperature, various other heat sensitive arrangements may be provided, including a heat sensitive arrangement which is charged with a gas or liquid, the pressure of which rises rapidly when the temperature rises beyond a predetermined level, and it will be appreciated that if such an embodiment is utilised a reservoir of liquid or gas may be provided, and the housing may be lifted by a piston mounted in a tube or conduit in communication with the reservoir. Also, in one embodiment of the invention, the plant enclosure may be directly mounted over soil, the central aluminium pole being located in an appropriate pole formed in the soil, and a removable side wall being provided to simulate the side wall of the base 2. In such an embodiment of the invention the tube 14 may diverge so that the tube covers a larger area of soil than merely the area of the roof or support member. Such an embodiment of the invention can be used in a garden or allotment. Reference is made to co-pending application No. 7 918 337 (Serial No. 1 573 203), divided from the present application, which relates to a device for opening a ventilator comprising master and slave pistons, and a structure comprising metals having different coefficients of expansion. WHAT WE CLAIM IS:

1. An enclosure for plants comprising a base, means supporting a housing over said base and means for raising all or part of said housing relative to the base to provide openings substantially at the bottom and at the top of said housing to permit ventilation of the enclosure when desired or when the temperature therein exceeds a predetermined temperature.

for raising the housing including means for raising said roof or support member relative to said base.

8. An enclosure according to claim 7 wherein the lower edge of said transparent or translucent is provided with recesses or apertures which are raised above part of the base when said housing is raised to permit air to enter the lower part of the enclosure.

9. An enclosure according to any one of the preceding claims wherein the raising means compnse two nested tubes formed from metals with different coefficients of thermal expansion, a hydraulic piston assembly actuated on differential expansion of said tubes to provide hydraulic fluid under pressure and a further piston assembly adapted to raise all or part of said housing, to enable at least part of the housing to be raised automatically.

10. An enclosure according to claim 9 wherein said raising means comprise a hydraulic system comprising a master piston and a sleeve piston, said master piston being secured to a first metal tube of metal having a relatively low coefficient of thermal expansimon which tube is secured, at the end thereof remote from the master piston, to another coaxial second tube of a metal of relatively high coefficient of thermal expansion and which forms a cylinder for said master piston, there being means for conducting hydraulic fluid from said cylinder for said master piston to said slave piston, said slave piston being of smaller surface area that the master piston.

11. An enclosure according to claim 10 wherein said slave piston is mounted within said metal tube having a relatively low coefficient of thermal expansion, a bore being provided in said tube communicating with the cylinder of said master piston.

12. An enclosure according to claim 10 or claim 11 wherein a further tube of metal of relatively high coefficient of thermal expansion is provided, said tube being secured to the point of connection of the said first and second tubes and also engaging a movable bung which is movable within the cylinder of the master piston.

13. An enclosure according to any one of claims 9 to 12 wherein said hydraulic systems contains a hydraulic fluid of relatively high coefficient of thermal expansion.

14. An enclosure according to claim 13 wherein said hydraulic fluid is isopropyl alcohol or ethyl alcohol.

15. An enclosure according to any one of claims 9 to 14 wherein said first tube is of steel and said second tube is of aluminium.

16. An enclosure according to claim 12 or any claim dependent thereon, wherein said further tube is of aluminium.

17. An enclosure according to claim 5 or any claim dependent thereon wherein one or more containers are mounted on said pole, each container having a tubular portion accommodating the pole, the tubular portion having a tapering internal bore, a resilient ring being mounted on the pole and being wedged in the tapering bore to retain the container in position.

18. A plant enclosure substantially as herein described with reference to and as illustrated in the accompanying drawings.

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