 Sheet metal door frame and a method for installing the same in a doorway |
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| Composite complex profile and the process for its manufacturing |
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| Sliding guide |
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| Particle for vibration damping |
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| Fluid-filled insulating bushing |
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| Motor mount compensator assembly |
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| Method of sampling environmental conditions with a self-contained downhole gauge system |
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| Rotatable bracket securing a window frame to a roof |
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| Plastics pallet |
| What is claimed is: 1. A pallet of plastic material, comprising an upper loading surface being ... |
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| Method of constructing a foundation for buildings |
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Pool liner installation system
| Details |
Inventors: Ryan, Richard T.;
Assignee:
Primary Examiner: Safavi; Michael
Assistant Examiner:
Attorney, Agent or Firm: Eggins; D. W.
The installation of a vinyl liner within an in-ground swimming pool is carried out using a direct drive, over-hung vacuum machine to exhaust air from between the liner and the steel walls and cement bowl within which the liner is installed. The vacuum machine has the overhung impellor located within a volute chamber isolated from the driving electric motor, so that the induced air flow is segregated from the driving motor. The vacuum machine impellor is of non-corrosive material, to avoid corrosion of the impellor when water is entrained, and to avoid the consequent imbalance and undue wear of the bearing that would otherweise ensue. The paddle-style impellor blades ensure that the vacuum suction is insufficient to cause intake of the pool liner into the air-evacuation hose. |
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DETAILED DESCRIPTION OF THE INVENTION Referring to FIG.
1, the system embodiment 10 shows the side of an in-ground pool, having a reduced within the steel-walled, concrete bottomed pool basin, of which the lip 14 is seen.
The blades are substantially planar, having radially outer edges that are advanced in the direction of rotation of the impellor, relative to the radially inner edges of the blades.
The full-line illustrated embodiment shows a vacuum machine 16 having a central air inlet 18 fitted with a removable suction inlet 20.
The suction inlet 20 includes an elongated, removable flattened nozzle portion 22, a section of which appears in FIG.
2.
The elongated, flattened nozzle 22 may be in the order of 40 inches or so in length, in-part to diminish edge leakage of air, downwardly from the point of insertion of nozzle 22 behind the liner 12.
The full-line embodiment represents a four-inch diameter inlet 20, having the nozzle 22 of corresponding section.
The above referred-to reduced suction provided by the paddle-like planar blades at low air-flow conditions is such that, while the exhaustion of air from the interstitial space is maintained so as to keep the liner drawn about the suction intake, the liner is not drawn into the suction intake.
This reduced suction, as attributed above to the generation of turbulence by the impellor blades, may also be due, in-part, to the orientation of the blades, with the radially outer edges advanced in the direction of rotation of the impellor, in leading relation to the radially inner edges of the blades.
The phantom-lined machine embodiment 26 having a two-inch diameter inlet 30 and a flattened nozzle 32 of corresponding section.
I have found that care must be taken in selecting suction line sizes, so that the substitution of two, one and one-half inch diameter suction lines, connected in-parallel, in place of one, two-inch suction line, can lead to unsatisfactory operation of the system.
I have found that a 1-horsepower (electrical) vacuum machine installation in accordance with the invention can effectively service a pool system, using one four-inch suction line, or using two, two-inch suction lines connected in parallel from a four-inch header
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