as best shown in fig1 and 2 , a preferred embodiment of the present invention is comprised of housing , generally 10 , hanging from a ceiling mounting plate 31 by hooks 25 and cables 27 . a hose drive assembly 16 , shown in detail in fig4 and 5 , is positioned within housing 10 to withdraw and return a vacuum hose 18 . a hose guide 29 directs hose 18 into and out of housing 10 . housing 10 is comprised of a forward compartment 20 , and a rearward compartment 22 , separated by a divider wall 24 . a hinged debris collector access door 19 opens to allow easy removal or installation of debris collector 21 . motorized pulleys 13 attached to housing 10 raise or lower housing 10 by spooling or unspooling cables 27 . a portion of hose 18 terminating with handle 38 hangs below hose guide 29 . electrical power for the entire vacuum system is delivered from electrical outlet 167 through power cord 166 to distribution box 169 . the circuitry associated with box 169 is shown in detail in fig6 . an array of switches located on the grip of handle 38 direct electrical power flow within the system . switch 110 activates and deactivates hose drive assembly 16 as well as selects the direction of travel for hose 18 . switch 112 energizes and de - energizes vacuum source 48 . switch 113 energizes and de - energizes motorized pulleys 13 as well as selects the direction of rotation of pulleys 13 resulting in the raising or lowering of housing 10 . providing that the ceiling of a structure is low enough to put user maintainable parts within reach while having only one end of the housing lowered , another embodiment of the present invention is available . fig3 depicts this other embodiment in which the front wall of housing 10 is permanently attached to the ceiling of a structure by a hinge 39 . a single motorized pulley 13 fixed to the outside of one sidewall near a corner of the rearward section is fastened to at least one cable 27 attached to a single hook 25 . hook 25 is fastened into the ceiling of the structure from a point on the ceiling nearly directly over pulley 13 . a hose guide 29 located flush with the bottom of the front wall of housing 10 guides hose 18 and handle 38 to hang downwardly within reach of the user . the access door 19 hinged into the rear wall of housing 10 allows access to the debris collector 21 . similar to the embodiment of fig1 and 2 , switches 110 , 112 and 113 route power flow throughout the system . a minor difference with this embodiment is that switch 113 switches power to only to a single motorized pulley 13 . optionally , two limit switches 41 and 43 can be wired within the current path of motorized pulley 13 such that they interrupt current to motorized pulley 13 once position limits are reached . limit switch 41 located on the top wall of the housing near hinge 39 is normally closed when the rear of housing 10 is between the raised and lowered position . however , once housing rotates about the axis of hinge 39 lowering the rear of housing 10 within a predetermined distance below the ceiling , normally closed limit switch 41 opens de - energizing motorized pulley 13 . at this point , switch 113 will allow current to flow through motorized pulley 13 only in a direction that winds cable 27 onto the spool of pulley 13 rotating housing 10 in an upward direction . limit switch 43 is normally closed when the rear of housing 10 is between the predetermined lowered position and the raised position flush with the ceiling . however , as the rear of the housing approaches the ceiling , limit switch 43 begins to open and is fully open just as the top edge of the rear of the housing becomes flush with the ceiling interrupting the flow of current to motorized pulley 13 stopping any further upward movement . as best shown in fig4 hose drive assembly 16 is comprised of a housing 52 enclosing first and second opposed hose drive rollers 54 and 56 supported on parallel shafts 58 and 60 , respectively , so that the outer edges of their hose engaging surfaces face each other at a predetermined distance . roller 54 is formed of a gear 62 having gear teeth 64 about its periphery , and a cylindrical annular shoulder 66 that extends outwardly from one side about shaft 58 . an annular hose - engaging member 68 is secured around shoulder 66 . member 68 can be formed with a concave face 70 , having transverse hose engaging projections 72 equally spaced around its periphery . projections 72 may be integrally formed with member 68 , and are adapted to fit within valleys 74 on hose 18 . in the event hose 18 becomes slightly unsynchronized , or if valleys 74 are slightly less than equally spaced , projections 72 will flex upon engagement with hose 18 to adjust for the difference . roller 56 is similarly constructed of gear 76 having gear teeth 78 about its periphery , and a cylindrical annular shoulder 80 extending outwardly from one side of gear 76 about shaft 60 . an annular hose - engaging member 82 , secured around shoulder 80 , includes concave face 84 , with transverse hose engaging projections 86 equally spaced around its periphery . rollers 54 and 56 are driven by electric motor 88 communicating with gears 62 and 76 by way of worm gear 90 and transfer gear 94 . motor 88 is wired into an electrical circuit so that gear 90 can be rotated in either direction to reversibly rotate rollers 54 and 56 in opposite directions . spaced hose guides 96 and 98 are positioned on either side of rollers 54 and 56 and include orifices 100 and 102 , respectively , positioned along a vertical pathway extending through the center of nip 104 to accurately position hose 18 . as shown , guides 100 and 102 are made of a smooth non - abrasive material , such as nylon . however , the guides can also be made of metal , or can be in the form of idler rollers . drive roller 54 is supported on a pivotal mount 106 so that roller 54 can be pivoted from its hose engaging position to a hose release position in the event of a malfunction . release lever 108 normally holds roller 54 in the hose engaging position . an electrical circuit , shown schematically in fig6 joins motor 88 to drive control switch 110 in handle 38 . switch 110 includes forward , off and back positions , so that the operator can activate the drive assembly to extend or retract hose 18 . in addition , the circuitry includes a switch 112 to activate suction device 48 . motor 88 is pivotally mounted on transfer gear shaft 114 . in the event that the gearing jams , e . g ., as a result of binding of hose 18 , gear 78 will remain stationary , while gears 90 and 94 will continue to turn . as a result , motor 88 will be caused to pivot about shaft 114 . a sensor switch 116 is also positioned in the electrical circuitry including motor 88 . switch 116 is of the type that emits a light that is reflected back to the sensor , and remains closed as long as light is reflected . a reflected flag 118 is mounted on the bottom of motor 88 and normally reflects light back to sensor 116 . however , when there is a malfunction , causing motor 88 to pivot from its normal position , flag 118 is moved out of position , opening switch 116 . when the malfunction is corrected , motor 88 is urged back to its normal position by springs 120 and 122 . in operation , hose 18 is positioned in compartment 22 with its inner end connected to outlet 46 and its upper end , carrying handle 38 extending into compartment 20 . hose 18 extends along a pathway through guide 98 , nip 104 and guide 96 . when the vacuum system is to be used , the operator reaches up and grasps handle 38 and moves switch 10 to its forward position , causing motor 88 to rotate rollers 54 and 56 so that their inner faces move toward compartment 22 . members 68 and 82 firmly engage the outer surface of hose 18 with projections 72 and 86 extending into valleys 74 , withdrawing hose 18 from compartment 22 and deploying hose 18 from compartment 22 and deploying hose through compartment 20 out of the housing . when hose 18 has been deployed to the desired length , the operator moves switch 110 to its off position . the operator then moves switch 112 to the on position to begin vacuuming . when vacuuming is completed , the operator moves switch 112 to the off position , and moves switch 110 to its back position , causing motor 88 to rotate rollers 54 and 56 in the opposite direction so that their inner faces move away from compartment 20 , returning hose 18 into its stored position in compartment 22 . fig7 shows yet another embodiment of a ceiling mounted vacuum system generally 200 having a bottom surface 210 mounted to the ceiling of a building . bottom surface 210 is in a plane flush with the ceiling . a hose guide 220 provides an exit for a vacuum hose 280 and handle 290 . fig8 depicts a side view of the embodiment showing a positioning means 230 incorporating at least one spring 240 for facilitating manual positioning of the vacuum system . a pull string 250 is provided so that a user can lower the vacuum system to allow access to a vacuum bag 260 by opening an access door 270 . the hose 280 hanging below surface 210 ends with a handle 290 . system 200 uses the hose drive mechanism shown in fig4 to extend and retract hose 280 . two switches 300 and 310 located on handle 290 control power flow to the vacuum system &# 39 ; s vacuum source and hose drive mechanism respectively . a hinge 320 connects one end of lower surface 210 to the ceiling . fig9 shows still another embodiment of the flush ceiling mounted vacuum system , generally 400 that uses a positioning means similar to that of fig3 . a motorized pulley 410 , a cable 420 , an attic - mounting hook 430 and hinge 440 forming the positioning means , is provided so that a user can lower the vacuum system to allow access to a vacuum bag 450 by opening an access door 460 . a hose 470 hanging below a lower surface 480 , ends with a handle 560 that includes a switch 550 to control power flow to the vacuum system &# 39 ; s vacuum source . lower surface 480 of system 400 lies in a plane flush with the ceiling of a building when system 400 is in a raised position . a wall switch panel 490 having switches 500 and 510 is provided for activating the positioning system and the hose drive mechanism shown in fig4 . an optional hand held remote control 520 having switches 530 and 540 is optionally provided for activating the positioning system and hose drive mechanism respectively . certain modifications and improvements will occur to those skilled in the art upon a reading of the foregoing description . for example , the positioning means for raising and lowering the vacuum system housing could be realized with a mechanical linear actuator of the ball screw type or by pneumatic cylinders and other similar positioners without deviating from the scope of the invention . it should be understood that all such modifications and improvements have been deleted herein for the sake of conciseness and readability but are properly within the scope of the following claims .
a self - contained vacuum system attachable to the ceiling of a building is described . the system includes a housing having a hose storage compartment and a vacuum source compartment ; a vacuum hose extendable between a retracted position in the hose storage compartment , and an extended position extending from the hose storage compartment ; a reversible drive mechanism within the housing to move the hose between retracted and extended positions ; a positioning mechanism to lower and raise the housing ; a control device in the form of a control handle with switches , connected to the distal end of the hose and a vacuum source mounted in the vacuum source compartment , the hose having an inner end communicating with a debris collector .