POWER DOOR DRIVE AND DOOR SUPPORT HAVING MOTOR OPERATED LOCKS

Abstract: Rotary locks used on transit vehicle doors (2) when opened and closed by a rotating helical door drive member (40). In a preferred embodiment, a first lock utilizes a negative thread portion (51) of the helical drive (40). A second lock utilizes a rotating lock pawl (22) and stop (23). The drive (40) and lock can be used to operate door systems with and without separate door hangers. Compensation for camber variations in car structure is provided through the use of spherical mounts or drive member journals (35, 38).

Description: POWER DOOR DRIVE AND DOOR SUPPORT HAVING MOTOR OPERATED LOCKS SPECIFICATION: TO ALL WHOM IT MAY CONCERN: BE IT KNOWN THAT I, Redreddy Sukumar Reddy, a citizen of the India, residing in Evanston, County of Cook, State of Illinois, have invented a certain new and useful power door drive and door support having motor operated locks. BACKGROUND OF THE INVENTION: This invention relates generally to power drives for vehicular doors, and more specifically to drive systems employing rotary, helical drive members including primary and secondary mechanical door locks directly actuated by the helical drive. Rotary helical drives for vehicular doors are typically disclosed in U.S. Patents 5,077,938, and 3,745,705. The operators in these references employ rotary drives utilizing ball screw driven members or drive nuts and include various means of locking the asso¬ ciated vehicular doors. Drive systems for vehicular doors utilized on mass transit vehicles must satisfy particular operating requirements specific to those vehicles. These require- ments include positive, and in some cases, redundant mechanical lock systems, capable of insuring that doors remain closed and operable during car travel and any other car location other than predetermined passenger discharge areas. Additionally, it is required that doors can be manually opened through the use of an emergency release system which allows unlocking the door and manu¬ ally forcing the doors from closed to an open position. Door locking is particularly difficult with the rotary, helical drive, since the door is moved by a nut or moving member traveling on a threaded rod. With this system, any failure of the drive nut or motor actuated rotating threaded shaft can result in a free-wheeling door, or an ability to manually or back-drive the opera¬ tor to a door open position. Presently used drive systems typically include complicated and expensive auxiliary mechanisms to provide locking means external or ancillary to the drive system. The invention disclosed herein features rela¬ tively simple lower cost primary and secondary locks directly driven by the rotating helical threaded drive member. Additionally, in the preferred embodiment, the invention disclosed herein is capable of supporting the driven door in addition to driving it from open to closed positions. While the rotary locks disclosed herein are shown in a configuration having direct door support, application of the lock to door systems utilizing sepa¬ rate door hangers is contemplated. Lock operation with or without a separate hanger is equivalent. Accordingly, it is an object of this invention to provide a power door drive for mass transit vehicles utilizing a rotary, helical drive system having primary and secondary mechanical door locks directly operated by the helical drive. It is an additional object of this invention to provide a rotary, helical door drive system for mass transit vehicles wherein the helical drive member carries the driven door. It is a further object of this invention to provide a rotary, helical door drive system for mass transit vehicles wherein a primary lock is an integral part of the helical drive and driven nut. It is a further object of this invention to provide a power door operator having a rotary, helical drive system wherein a secondary lock is integral in the helical drive and nut components. It is a further object of this invention to provide an overdoor mounted rotary helical drive operator providing mounting bracket which will compensate for deflections and variations in the vehicle mounting struc¬ ture. BRIEF DESCRIPTION OF THE INVENTION: The drive system of the invention disclosed utilizes a helically threaded cylindrical drive rod and a cooperating driven nut for reciprocally moving across threaded portions of the helical drive. Attached to the driven nut is a door hanger including bearing means coop- erating with the thread crests of the helical drive mem¬ ber so as to carry the driven door weight. Applicant's invention incorporates in part an improvement on the drive system disclosed in U. S. Patent No. 3,308,674. Although the rotary lock features of the inven- tion are disclosed in an embodiment where the door weight is carried on a helically threaded drive rod, use of the locks in alternate embodiments having separate door hang¬ ers is contemplated throughout. An alternate embodiment of the invention in- eludes a separate door hanger such as disclosed in United States Patent No. 3,745,705, incorporated by reference herein. A particular feature of the operator is the use of zero pitch and negative pitch portions of the helical thread means located at the end of said threaded portion. On entering the zero and negative pitch portions of the thread, the driven nut is essentially locked in a manner similar to that of over-center locks commonly utilized in mechanical linkages. An additional or secondary lock is provided by a rotating lock pawl on the end of the threaded or helical drive member, cooperating with a sector shaped latch on the driven nut. The combination is arranged such that in the negative pitch portion of the helical drive member, the lock pawl and sector latch or striker forming a redundant lock wherein any axial movement of the nut along the helical drive member is prevented by both. This combination provides both prima- ry and secondary locks operable by the rotary drive sys¬ tem. Auxiliary electrical control circuitry incorpo¬ rates counts indicative of rotary motion of the helical drive member and detection of the secondary lock posi¬ tions of the lock pawl and sector latch described above. The system provides indication of proper door locking and, in the alternative, indication of operator malfunc¬ tion or failure. BRIEF DESCRIPTION OF THE DRAWINGS: Other objects and advantages of the invention will become apparent upon reading the following detailed description and upon reference to the drawings in which: Figure 1 is a partial section through a transit car utilizing the invention, particularly showing an inside view of vehicular doors, and the power door opera¬ tor of the invention in place on the vehicular doors. Figure 2 is a partial section along the line 2- 2 of Figure 1, particularly showing location of an emer- gency door opening actuator in a normal or unaσtuated position. Figure 2A is a fragmentary view of a portion of Figure 2, particularly showing the emergency sector gear and rotating shaft cooperating with the ratchet assembly, shown in operation or door unlock position. Figure 2B is a fragmentary view of a portion of Figure 2, particularly showing the emergency door opening structure of the invention including a sector gear, coop¬ erating pinion, and ratchet assembly in an emergency or actuated position. Figure 2C is an additional fragmentary view of a portion of the emergency operating system of the inven¬ tion, particularly showing the sector gear and its asso¬ ciated emergency handle. Figure 3A is a partial section along the line 3a-3a of Figure 2, particularly showing the following: a: drive nut on drive screw in nor¬ mal position just before door closing operation. b: location and position of door 5 lock pawl in "A" location of Figure 4. c: relative positions and locations of the lock pawl, lock pawl stop or striker and lock pawl actuated sensor. 10 d: sections of driven and assembly including shaft thrust bearing, shaft counter-gear, emer¬ gency actuator, and associated electromagnetic sensor. Figure 3B is a portion of the section of Figure 15 3A, however, limited to portions of the drive screw and door drive nut in location "B" of Figure 4. Figure 3C is an additional section similar to Figure 3B, however, showing the door drive screw, drive screw nut, and lock pawl in position "C" of Figure 4. 20 Figure 3D is a section similar to Figure 3C, however, showing the door drive screw lock pawl and lock pawl latch or stop in fully locked position in location "D" of Figure 4. Figure 4 is a partial section of the driven end 25 of the invention along line 4-4 of Figure 3A, particular¬ ly showing sequential positions of the lock pawl in nor¬ mal rotation, approaching lock, and the fully locked position of the lock pawl and lock pawl stop or striker. Figure 5 is a sectional view along the line 5-5 30 of Figure 3A, particularly showing cam follower bearings as positioned in each end of the door drive nut. Figure 6 is an exploded partial view of the driven end of the door drive of the invention, particu- larly showing motion control and control elements of the invention. Figure 7 is a partial additional exploded view of the drive end portion of the operator of the inven- tion, particularly showing the drive motor, drive motor- screw drive shaft coupling and associated spherical bear¬ ing utilized in the car mounting bracket. Figure 8 is a section along the line 8-8 of Figure 7, particularly showing the cylindrical or needle bearing in its spherical mount. Also shown is a portion of the screw drive opposite that of Figure 5, and its door drive nut including the cam follower bearings inter¬ nal of the nut. Figure 9 is a section through line 9-9 of Fig- ure 8, particularly showing the resilient coupling and mating projections of the motor-drive screw shaft cou¬ pling. Figure 10 is a "typical" control system employ¬ ing the invention disclosed herein. DETAILED DESCRIPTION OF OPERATION While the invention will be described in con¬ nection with a preferred embodiment, it will be under¬ stood that it is not intended to limit the invention to that embodiment. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the inven¬ tion as described by the appended claims. In reference to Figure 1, there is shown biparting sliding doors 2 driven by overhead power door operator assemblies 10 from open position 4 to closed position 2 and similarly from closed to open. The door drive includes a multiple pitch helical drive screw mem¬ ber 40 driven by an electric motor assembly 33 to provide door motion. Doors 2 are attached to helical drive 40 by a suitable door hanger assembly 31 (Figure 2), attached to drive nut 52 and mounting tab 30. Although shown with individual operators per door, applicant submits that a to drive nut 52 and mounting tab 30. Although shown with individual operators per door, applicant submits that a single operator could operate both doors, from a single shaft power source, using threaded drive screws having opposite handed threads. The drive motor end assembly 6 of drive screw 40 has a reduced diameter end 36 (Figure 8) journaled in a spherical mount cylindrical roller self-aligning bear¬ ing 34 attached to the car structure 11 with bracket 38. Use of a cylindrical roller bearing is an important com¬ ponent of a self-alignment feature of the invention to be subsequently discussed in greater detail. Motor 33 is attached to the flange of the self-aligning bearing 34 by a flanged sleeve 39, and drives screw 40 through typical flexible coupling 37 of the Lovejoy® type. The self- aligning bearing 34 has the freedom of movement about the vertical axis and about the horizontal axis perpendicular to the axis of the drive screw. The opposite or driven end 8 of the drive screw 40 is journaled in a spherical mount self-aligning thrust bearing 41 (Reference Figure 3A) . Both bearings 41 and 34 are suitably fastened to the car structure 11 (by supports 35 and 38, respectively). The drive screw mem¬ ber 40 carries a drive nut assembly 52. With reference to Figure 3A, also attached to the driven end assembly 8 of the drive screw 40 is an extended portion 12 having reduced diameters. Attached to the shaft portion 12, and fixed for rotary motion indicative of shaft rotation, and in sequential spacing from the rotary bearing journal, there are a toothed sprocket 14, a ratchet assembly 60, having an emergency release pinion gear 61, a ratchet pawl 62, a pawl spring 63, and a nut or stop fastener 13 mounted on the shaft end for maintaining location and spacing of the aforemen- tioned gears. The ratchet assembly is free to rotate relative to toothed sprocket with a sleeve bearing in be¬ tween. drive screw 40 is a rotating panel sensing and lock pawl 22. Extending from the end face 53 of drive nut 52 and between the drive nut end 53 and the rotating lock pawl 22, is a lock pawl stop or striker 23. As best shown in Figure 6, the rotating lock pawl 22 is essen¬ tially sector shaped as is the lock pawl stop 23, occupy¬ ing a portion of the 360 degree radial periphery of ei¬ ther the drive screw shaft 12 and nut face 53, respec- tively. The relative rotational and axial positions of lock pawl 22 and lock pawl stop 23 are an important por¬ tion of the invention disclosed herein in that as the rotating drive screw 40 moves drive nut 52 and its asso- ciated door hanger 30 to a point approaching the closed door location, positioning of the pawl stop 23 and rotat¬ ing pawl 22 is such that in the final closed and locked position discussed above, any translation of the drive nut in the door open direction, due to either failure of the nut, or other malfunction in the system would bring pawl 22 and stop 23 into engagement, preventing opening of the door. This configuration, therefore, provides a positive lock operable only by rotation of the drive screw which maintains the door in its closed position. This lock provides additional redundancy in door locking, a highly desirable feature in operating transit car door equipment. A further enhancement of the positive lock described above is provided by a spring loaded plunger 24 passing through a portion of the pawl stop 23. The plunger is extended to position 26 (Reference Figure 3A) by presence of the rotating pawl 22 within the sector limits of the lock pawl stop 23 as shown in Figure 3D. Extension of the plunger 24, therefore, provides an indi- cation of the presence of the rotating pawl through coop¬ eration with electromagnetic pickup or presence sensor 27 eration with electromagnetic pickup or presence sensor 27 carried by a bracket 28 attached to the bearing mount as shown. Located on an extension of the bracket 28 is a cam 29. Since, due to the one-to-one relationship be¬ tween nut 52 location and rotation of drive shaft 40, it is possible to anticipate door location as a function of the shaft rotation. Rotation is determined by shaft angular position sprocket 14 through counting of electri- cal pulses due to the electromagnetic reluctance changes introduced in the drive screw rotation pickup or sensor 15 by the sprocket teeth peripheral to the shaft driven sprocket 14. Since the plunger 24 is carried by the drive nut 52 to which the door is attached, it is mandatory that the nut 52 and, in turn, the door panel, reaches fully door closed position before the plunger 24 can interact with the cam 22 which is secured to the drive screw and eventually picked up by the sensor 27 to indi- cate the door closed and locked signal. Without meeting the above condition in entirety, the door closed and locked signal cannot be generated. In the event that a malfunction in the drive system causes the drive nut 52 and the associated door carried by hanger 30 not to move to a closed position, and lock pawl 22 not actuate the plunger 24, a door actu¬ ator failure would be indicated through comparison of rotational counts from pickup 15 with electronic means of a conventional type (Reference Figure 10), a malfunction would be detected. However, if simultaneous failure of the com¬ pression spring 25 of the plunger 24, resulted in plunger 24 occupying an extended position without the presence of lock pawl 22, thereby indicating a closed and locked door, action of the cam 29 and plunger 24 on subsequent door excursions would result in movement of plunger 24 into an inoperative or retracted position relative to the plunger pickup or sensor 27, thereby avoiding false indi¬ cation of a closed and locked door. With reference to Figures 3A, 5 and 8, drive nut 52 incorporates a drive roller or pin 54 at one end. Drive pin 54 engages thread walls 45 in advancing drive nut 52 along drive shaft 40. Also drive nut (Figures 5 and 8) incorporates load bearing cam followers 55 at each end thereof. Referring now to Figures 3A, 3B, 3C, 3D and 4, there is shown a portion of the threaded drive screw shaft 40. Thread crests 44 and valleys 46 of the running portion of shaft 40 have a first pitch 42 for linear travel per turn of the drive screw 40 when rotating in direction 43 for door travel from open to closed. The running thread 42 extends from the threaded portion of the drive end 36 to a short transition portion having approximately zero lead. A negative or reverse lead or lock thread portion 50 of drive screw 40 then extends for approximately 90" rotation of the drive screw. It should be noted that although advancing at a predetermined rate for the operating or running pitch 42, travel of the drive nut 52 in the negative lead portion 50 is, for a relatively limited amount of rotation of the drive screw 40 for approximately 90", opposite in direc- tion to motion of the drive nut when traveling in the running pitch portion of the thread 42. This complex motion is essential to operation of the operator dis¬ closed herein in that for continuous unidirectional rota¬ tion of the drive screw 43, distinct and separate move- ments of the drive nut 52 and its associated door hanger 30 are obtained. These motions are: a predetermined travel distance 42 per revolu¬ tion of shaft rotation; zero travel for a short transitional portion, and essentially reverse or negative travel shown by direction arrow 57 (Reference Figure 3D) for an additionally predetermined number of shaft rotation de¬ grees. Again in reference to Figures 3A, 3B, 3C, and 4, there is shown operation of particularly important portions of the disclosed invention, in particular, a primary or negative thread pitch lock portion when roller pin 54 is in negative thread portion 51, and a secondary lock provided by the rotating lock pawl 22 and its coop¬ erating lock pawl stop or striker 23, all operating in phased sequence through rotation of the unitary drive screw 40. As best seen in Figure 3A, where there is shown a partial cross section of the driven end assembly 8 of the operator of the invention, wherein the drive nut assembly 52 and its associated drive pin roller 54 are for the clockwise or closing rotation 43 shown advancing the door and nut toward the fully door closed position shown in Figure 1 of the drive system. In order to show relative locations of the operating portions of the operator disclosed. Figure 1 is a partial sectional view looking outward from the inside of the car, whereas, the above mentioned Figures 3A, 3B, 3C, and 3D depict only the. right hand operator of Figure 1, as viewed from the driven end 8. Turning again to Figures 3A and 4, the rotating lock pawl 22 is in the "A" position of Figure 4 approxi¬ mately 270' rotation from the fully locked position. In Figure 3B, rotation of the screw drive 40 has proceeded 90 * in direction 43 to the "B" position of Figure 4. In Figure 3C, rotation of screw drive 40 has advanced an additional 90 * and is shown on Figure 4 as location "C". It should be noted that in each of the Figures 3A, 3B and 3C the axial displacement of secondary lock stop 23 has advanced in the direction shown by motion arrows 56, i.e, approaching the fully locked position of Figure 3D. Also advancing is the drive nut and its roller pin 54 from a normal thread pitch 42 in Figure 3A until in Figure 3C roller 54 has advanced to essentially a "0" pitch point 48 of the threaded drive 40. In Figure 3D, rotation of the drive screw 40 has moved the drive roller pin 54 to the end of a negative pitch portion of the thread 51, thereby providing effective "over-center" locking of the drive screw 40 and nut 52, since force on the door in the opening direction cannot produce rotational torque in a rotation of the screw in the direction of door opening. The exertion of force on the door in the opening direc- tion, in fact, will produce rotation of the drive screw in the closing direction due to the nature of the nega¬ tive lead thread action. Although the lock or negative thread portion 51 in a preferred embodiment occupies 90 * rotation of drive screw 40, other desired lengths and thread pitches could as well be utilized to achieve the self locking described above. Along with the travel of roller pin 54 to the end of a 90" negative lead portion of drive thread 40 , i.e., portion 51 and associated travel of nut 52, the secondary lock pawl 22 moves to occupy a slot 32 between the lock pawl stop or striker 23 and the drive nut face 53. This position insures that should the drive pin 54 fail, relative movement of the drive nut 52 along the drive thread 40 would be prevented by interference be- tweeπ the lock pawl 22 and the inner portion of the lock pawl stop or striker 23 (Reference Figures 3D and 6). This combination provides redundant locking of the car doors in a simple, highly effective and inexpen¬ sive way. It should be noted that with the aforemen- tioned redundant lock combination of the negative thread portion of the threaded drive screw, essentially an "over-center" lock, and an associated positive mechanical lock, only rotation of the threaded drive member 40 can effectively unlock the door. Therefore, applicant has provided in a single rotary motion both primary and sec¬ ondary locking means, a highly important feature in tran¬ sit vehicle power doors. An additional and novel feature of the inven¬ tion disclosed herein provides improved operation and installation through self-adjusting mounting devices. A known difficulty in operating door equipment on modern transit vehicles arises through variation in car struc¬ ture dimensions due to normal tolerance variations in manufacture, and, in particular, car structure variations at the door operator mounting due to variations in struc¬ ture camber caused by passenger loading and unloading in normal day-to-day operation. The invention disclosed herein overcomes many of these difficulties through the use of a combination of spherical and roller bearing assembly 34 in combination with a resilient motor coupling 37 in the drive end as- sembly 6 (Reference Figure 9). Similarly, at the driven end assembly 8, drive screw 40 is journaled at its re¬ duced diameter 12 by a spherically mounted thrust ball bearing 41. Applicant has discovered that utilization of spherical, self-aligning bearings in combination with thrust and roller bearings, respectively, at either end of helical drive member 40 provides improved installation and performance of the operator, i.e. when mounting the operator assembly 10 using brackets 35 and 38 to the car structure 11 (Reference Figures 2 and 9). In particular, the use of spherically mounted bearings allows for deflection or change in camber of the car structure 11 between mounts 35 and 38 without impos¬ ing stresses on the drive member 40. With reference to Figures 2, 2A and 2B, cooper¬ ating with emergency release pinion 61 and ratchet assem¬ bly 60 is an emergency release sector gear 19 (reference Figure 2B) . Operatively attached to sector gear 19 is emergency release handle 17. In an emergency release position (Reference Figure 2B), sector gear 19 is main¬ tained in the emergency position by toggle assembly 21. Toggle assembly 21 maintains the sector gear in either its inoperative or normal position (as shown in Figure 2) , or in an extended or emergency position to be subse¬ quently discussed. As indicated earlier, the positive lock portion 50 of the drive screw shaft 40 represents nominally 90' degrees rotation of the shaft, therefore, in order to manually unlock the door in the absence of drive screw power rotation, it is only necessary to rotate the drive screw shaft for approximately 90 * degrees in the opening direction. This is accomplished through manually moving handle 17, in a downward direction, thereby rotating sector gear 19 around its pivot 18 mounted on a bracket 5 in the direction shown, thereby engaging sector gear 19 and the emergency release pinion 61. Movement of the handle 17 to its emergency position rotates the drive screw shaft 40 out of the lock portions 50 and 51 of the drive screw thread (reference Figures 2 and 2B). At this point, the running lead 42 of drive screw shaft 40 is such that manual force on the door 2 will continue re- verse rotation of the shaft 40 , allowing the door to be manually opened. Since the toggle assembly 20 maintains the gear 19 in an upward position, electromagnetic posi¬ tion sensor 16 mounted on bracket 5, detects absence of the gear 19 and, through operation of an associated con- trol system (Reference Figure 10), prevents power opera¬ tion of the door when the sector gear is in the upper or emergency position (reference Figure 2B). Ratchet assembly 60 allows resetting of the emergency handle 17. Pinion 61 and spring loaded ratchet pawl 62 are a part of ratchet assembly 60. Pinion gear 61 is an integral part of the ratchet assembly 60. Ratchet assembly 60 is mounted on the sprocket 14 with a suitable bearing and is rotatable around sprocket 14. Sprocket 14 is secured to the drive screw reduced portion 12. The ratchet gear 64 is an integral part of the sprocket 14. Torque from the sector gear 19 is transmit¬ ted to the drive screw 40 in opening direction 66 through the pinion gear 61 and the ratchet assembly 60 in con¬ junction with spring loaded ratchet pawl 62 and ratchet gear 64. However, movement in an opposite direction is free, allowing upward motion of handle 17 to reset. In reference to Figure 10, a typical but not limiting control system utilizing the invention disclosed herein is shown. A controller 65 which may be of a type utilizing a microprocessor, programmable solid state logic, or relay logic, controls current to the drive motor 33. In turn, the drive motor 33 supplies torque to the helical drive member 40 or, as better shown by the drive end assembly 8, operate the doors in movement from open to closed. The microprocessor accepts inputs from the emergency actuator sensor 16, the door closed and lock sensor 27 operated by the rotating lock cam, and signals from the drive rotation counter assembly, i.e., sprocket 14 and sensor 15. Additional input representative of the drive motor current is also provided at the input of the controller 65 (Reference Figure 10). As discussed above, normal operation, of the drive system in moving doors from open to closed, results in a predetermined number of rotations of the drive mem¬ ber 40 through counts signaled by the counter sensor 15 for predetermined door travel. Since the rotary helical drive advances a fixed amount per revolution, counts generated by sensor 15 are compared with a stored proper amount representative of normal door operation in the controller 65. Similarly, signals from the lock sensor 27 are entered into the controller 65 when lock pawl 22 enters the lock pawl striker or stop 23, extending plunger 26, thus providing an indication through sensor 27. In operation, on initiating a door closed oper- ation, a proper number of counts from sensor 15 and indi¬ cation of closed and lock from sensor 27 indicate normal operation and do not result in an indication of malfunσ- tion on indicator 67. Should either the helical drive counts or the lock indicator deviate from their predeter¬ mined pattern, indications of door operator malfunction are suitably shown in the malfunction indicator 67. A further action of the controller 65 involves the presence or lack of presence of the emergency lever 17 as indicated by sensor 16. In operation, should the emergency lever be actuated by pulling downward (Refer¬ ence Figure 2) sector gear 19 would move into its actuat- ed position (Reference Figure 2B), and the resulting uncovering of sensor 16 would provide a signal to con¬ troller 65 for proper response to the perceived emergency situation. It should be noted that many other features in other combinations of the disclosed inventions could be incorporated in other control arrangements as needed for any particular application. As these alternate systems are not a part of the invention disclosed here, the sys¬ tem of Figure 10 is included only in order to complete applicant's disclosure. Thus it ' is apparent that there has been provid¬ ed in accordance with the invention of a power door drive and door support using motor operated locks that fully satisfy the objects, aims and advantages set forth above. While the operator disclosed has been described in con¬ junction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications and varia¬ tions as fall within the spirit and broad scope of the appended claims. What is claimed as new and desired to be se¬ cured by Letters Patent of the United States is:

Claims: CLAIMS: Claim 1. A rotary lock for an electric door drive used to open and close a door in a transit vehicle comprising: a rotary helical drive member; means electrically rotating said drive member; continuous thread means on said drive member, said threads having positive and negative pitch segments, said segments corresponding to running and lock portions of said drive member, respectively; nut means running on said thread means, said nut means carrying said door for motion therealong when said drive member is rotated, said motion moving said door along the running thread portion from a door open position to said lock thread portion for a door closed position; whereby nut travel into said lock thread por¬ tion prevents door movement without shaft rotation. Claim 2. The rotary lock of Claim 1 further comprising: car structure means overhead said door, for mounting said operator, said structure having load in¬ duced camber variations; first and second ends on said drive member; first and second means sphericallyjournaling said first and second drive member ends, respectively, for rotation therein, said journal means mounted on and disposed along said structure; cylindrical roller bearing means in one of said journal means; thrust roller bearing means in the other of said journal means; wherein load induced variations in car struc¬ ture camber are compensated by said journaling means. Claim 3. A rotary lock for an electric door drive used to open and close transit vehicle doors com¬ prising: a door mounted for opening and closing an open- ing in a transit vehicle side wall; a rotary helical drive member having first and second ends, said ends journaled overhead said door open¬ ing for rotary motion; means, on said second end, electrically rotat- ing said drive member; thread means on said drive member; nut means running on said thread means, said nut means having a face adjoining said drive member first end, an outer edge on said face, said nut carrying said door for motion therealong when said drive member is rotated, said motion moving said door from open to closed; a rotating lock pawl on said drive member first end, said lock pawl extending perpendicular to said drive member and occupying a limited sector of said lock pawl rotating periphery; striker means on said nut edge and extending outward and downward therefrom, said striker occupying a limited sector of said nut periphery, a lock space defined by said striker and nut face; means disposing said rotating lock pawl within said lock space for a door closed position; wherein nut travel from door open to door closed positions moves said lock pawl into said lock space, thereby preventing door motion without drive mem¬ ber rotation. Claim 4. A power door operator of the type utilizing a rotary helical drive and cooperating drive nut for moving a door from open to closed positions over an opening in a vehicular side wall comprising: a rotary helical drive member having first and second ends; means on said second end for electrically ro¬ tating said member; continuous thread means on said drive member, said segments having segments of positive and negative pitch threads, said lengths corresponding to running and lock positions on said drive member, respectively; nut means running on said thread means, said nut means carrying said door for motion therealong on rotation of said drive member, said nut motion moving said door along the running thread portion from a door open position to said lock thread portion for a door closed position; a face, having an outer edge, on said nut, said face adjoining said first drive member end; a rotating lock pawl on said helical drive member first end, said lock pawl extending perpendicular to said drive member and occupying a limited sector of said lock pawl rotating periphery; striker means on said nut means, said striker extending inward from said nut outer edge and spaced therefrom, said striker and nut face defining a lock space adjacent said nut face; means disposing said lock pawl internal of said lock space for a door closed position; wherein said door closed position of said nut and said lock pawl prevent door movement along said drive member without drive member rotation. Claim 5. A rotary lock for an electric door drive used to open and close transit vehicle doors com¬ prising: a door, mounted for movement over and away from an opening in a transit vehicle side wall; a rotary helical drive member having first and second ends journaled for rotary motion; means electrically rotating said drive member second end; thread means on said drive member; nut means running on said thread means, said nut means carrying said door for motion therealong when said drive member is rotated, said motion moving said door open to closed and from closed to open positions; a face having an outer edge on said nut, said face adjoining said drive member first end; a lock pawl on said drive member first end, said lock pawl extending perpendicular to said drive member and occupying a limited sector of said lock pawl rotating periphery; stop means on said nut face outer edge adjacent said lock pawl and spaced therefrom, said stop extending inwardly from said edge and spaced from said face, there¬ by defining a lock space, said stop occupying a limited sector of said nut face and edge; means disposing said lock pawl within said lock space for a door closed position; and plunger means in said stop means, said plunger extended by said lock pawl when in said lock space, and retracted when said lock pawl is out of said lock zone; means sensing said extended plunger position and generating signal therefor; indicator means responsive to said lock signal; wherein movement of said door to a door closed and locked position is verified. Claim 6. A power door operator of the type utilizing a rotary helical drive and cooperating drive nut for moving a door from open to closed positions over an opening in a vehicular side wall comprising: a rotary helical drive member having first and second ends; means on said second end, electrically rotating said member; continuous thread means on said drive member, said threads having segments of positive and negative pitch threads, said segments corresponding to running and lock positions on said drive member, respectively; nut means running on said thread means, said nut means carrying said door for motion therealong on rotation of said drive member, said nut motion moving said door along the running thread portion from a door open position to said lock thread portion for a door closed position; a face, having an outer edge, on said nut, said face adjoining said first drive member end; a rotating lock pawl on said helical drive member first end, said lock pawl extending perpendicular to said drive member and occupying a limited sector of said lock pawl rotating periphery; striker means on said nut means, said striker extending inward from said nut outer edge and spaced therefrom, said striker and nut face defining a lock space adjacent said nut face; means disposing said lock pawl internal of said lock space for a door closed position; plunger means in said striker means, said plunger extended by said lock pawl when in said lock zone, and retracted when said lock pawl is out of said lock zone; means sensing said extended plunger position and generating signal therefor; indicator means responsive to said lock signal; wherein said door closed position of said nut in said lock pawl is indicated and door movement along said drive member without drive member rotation is pre¬ vented. Claim 7. A power door operator of the type utilizing a rotary helical drive and cooperating drive nut for moving a door from open to closed positions over an opening in a vehicular side wall comprising: a rotary helical drive member; means electrically rotating said drive member; continuous thread means on said drive member, said threads having segments of positive and negative pitch threads, said segments corresponding to running and lock positions on said drive member, respectively; nut means running on said thread means, said nut means carrying said door for motion therealong on rotation of said drive member, said nut motion moving said door along said running thread portion from a door open position to said lock thread portion for a door closed position; whereby nut travel into said lock thread por¬ tion prevents door movement without shaft rotation. Claim 8. The operator of claim 7 further com¬ prising: car structure means overhead said door, for mounting said operator, said structure having car loading induced camber variations; first and second ends on said rotary helical drive member; first and second means spherically journaling said first and second drive member ends, respectively, for rotation therein, said journal means mounted on and disposed along said structure; cylindrical roller bearing means in one of said journal means; thrust roller bearing means in the other of said journal means; wherein load induced variations in car struc¬ ture camber are compensated by said journaling means. Claim 9. An integral power door operator mounted overhead of a transit vehicle door for opening and closing an opening in said vehicle comprising: car structure means having camber variations due to car loading for mounting said operator; a rotary helical drive member having first and second ends; means coupled to said first helical member end for rotating said helical drive; continuous thread means on said drive member; nut means running on said thread means, said nut means carrying said door for motion therealong on rotation of said drive member; first and second means spherically journaling said first and second drive member ends, respectively, for rotation therein, said journal means mounted on and disposed along said structure; cylindrical roller bearing means in the other of said journal means; thrust roller bearing means in said second journal means; means spherically mounting said roller bearing means on said car structure; wherein load induced variations in car struc- ture camber are compensated by said journaling means. Claim 10. A rotary lock for an electric door drive used to open and close a door in a transit vehicle comprising: means supporting said door for motion from open to closed; a rotary helical drive member; means electrically rotating said drive member; continuous thread means on said drive member, said threads having positive and negative pitch segments, said segments corresponding to running and lock portions of said drive member, respectively; nut means running on said thread means, said nut means attached to said support means for motion therealong, when said drive member is rotated, said mo¬ tion moving said door along the running thread portion from a door open position to said lock thread portion for a door closed position; whereby nut travel into said lock thread por¬ tion prevents door movement without shaft rotation. Claim 11. The rotary lock of Claim 10 further comprising: car structure means overhead said door, for mounting said operator, said structure having load in¬ duced camber variations; first and second ends on said drive member; first and second means spherically journaling said first and second drive member ends, respectively, for rotation therein, said journal means mounted on and disposed along said structure; cylindrical roller bearing means in said first journal means; thrust roller bearing means in said second journal means; wherein load induced variations in car struc¬ ture camber are compensated by said journaling means. Claim 12. A power door operator of the type utilizing a rotary helical drive member and cooperating drive nut for moving a door from open to closed positions over an opening in a vehicular side wall comprising: means mounting said door for motion from open to closed positions over said opening; a rotary helical drive member having first and second ends; means electrically rotating said member second end; continuous thread means on said drive member, said threads having segments of positive and negative pitch threads, said segments corresponding to running and lock positions on said drive member, respectively; nut means running on said thread means, said nut means attached to said mounting means for motion therealong on rotation of said drive member, said nut motion moving said door along the running thread portion from a door open position to said lock thread portion for a door closed position; a face, having an outer edge, on said nut, said face adjoining said first drive member end; a rotating lock pawl on said helical drive member first end, said lock pawl extending perpendicular to said drive member and occupying a limited sector of said lock pawl rotating periphery; striker means on said nut means, said striker extending inward from said nut outer edge and spaced therefrom, said striker and nut face defining a lock space adjacent said nut face; means disposing said lock pawl internal of said lock space for a door closed position; wherein said door closed position of said nut and said lock pawl prevent door movement along said drive member without drive member rotation. Claim 13. A rotary lock for an electric door drive used to open and close transit vehicle doors com¬ prising: means mounting a door for movement over and away from an opening in a transit vehicle side wall; a rotary helical drive member having first and second ends journaled for rotary motion therearound; means electrically rotating said drive member second end; thread means on said drive member; nut means running on said thread means, said nut means attached to said mounting means for motion therealong when said drive member is rotated, said nut motion moving said door from open to closed and from closed to open positions; a face having an outer edge on said nut, said face adjoining said drive member first end; a lock pawl on said drive member first end, said lock pawl extending perpendicular to said drive member and occupying a limited sector of said lock pawl rotating periphery; stop means on said nut face outer edge adjacent said lock pawl and spaced therefrom, said stop extending inwardly from said edge and spaced from said face, there- by defining a lock space, said stop occupying a limited sector of said nut face and edge; means disposing said lock pawl within said lock space for a door closed position; and plunger means in said stop means, said plunger extended by said lock pawl when in said lock space, and retracted when said lock pawl is out of said lock zone; means sensing said extended plunger position and generating signal therefor; indicator means responsive to said lock signal; wherein movement of said door to a door closed and locked position is verified. Claim 14. An integral power door operator mounted overhead of a transit vehicle door for opening and closing an opening in said vehicle comprising: car structure means mounted above said opening, said structure having camber variations due to car load¬ ing for mounting said operator; a rotary helical drive member having first and second ends; means coupled to said first helical member end for rotating said helical drive; continuous thread means on said drive member; nut means running on said thread means, said nut means driving said door for motion therealong on rotation of said drive member; first and second means journaling said first and second drive member ends, respectively, for rotation therein; means spherically mounting said journal means to said car structure; bearing means in said journal means; wherein load induced variations in car struc¬ ture camber are compensated by said journaling means.

Inventors: REDREDDY SUKUMAR REDDY, REDREDDY, SUKUMAR, REDDY
Applicants: MARK IV TRANSPORTATION TECH, MARK IV TRANSPORTATION PRODUCTS CORPORATION
Application year: 1993
Main classification: E05F11
IPC codes: B61D19, E05B65, E05F11, E05F15