fig1 shows a representative embodiment and the environment of use of the source assembly according to the invention . the source assembly is indicated generally by reference numeral 10 . an x - ray source 20 is mounted to the source assembly 10 , which provides various ranges of motion and support to the source 20 . the source 20 and the source assembly 10 are shown in a representative x - ray environment . that environment includes a first stand 30 which serves as a film stand . film stand 30 includes side rails 31 and 32 . reciprocable vertically along siderails 31 and 32 is a film carrier 40 , which may illustratively receive an x - ray film cassette . stand 30 also advantageously includes a counterweight 35 as disclosed in co - pending 07 / 850 , 891 now u . s . pat . no . 5 , 469 , 492 . a second stand 50 is also included . this stand is mounted to a wall 60 which defines a reference plane of interest to the description of this invention . stand 50 includes side rails 51 and 52 . vertically reciprocable along siderails 51 and 52 is a first carriage 70 . in turn , a second carriage 80 is horizontally reciprocable along the first carriage 70 which includes rails 71 and 72 . stand 50 also advantageously includes a counterweight 75 as disclosed in co - pending 07 / 850 , 891 now u . s . pat . no . 5 , 469 , 492 . through the combination of stand 50 , carriage 70 and carriage 80 , the x - ray source 20 can be moved to a variety of positions in a plane parallel to the plane of the wall 60 . it should be noted that alternative means for moving the x - ray source 20 in this plane could also be used . for example , the above - described prior art system including a vertical column with a carriage vertically moveable thereon , and a floor - track for horizontal movement of the column could be used . one skilled in the art will appreciate that other means of for supporting and moving the x - ray source 20 in a plane parallel to the plane of the wall 60 are available . the environment in fig1 also includes a radiographic table 90 . in a similar manner to stand 30 , radiographic table 90 includes a means for receiving a film cassette , which is typically disposed underneath the top surface of the table 90 . with the environment of use thus established , reference is now made to fig5 which shows the various ranges of motion provided to the x - ray source 20 by means of the source assembly 10 . source assembly 10 , according to the invention , offers three ranges of motion . the first range of motion , depicted by reference number 100 is rotational motion about a horizontal axis . as will be discussed in greater detail below , a source mounting 110 is mountable to the source 20 . this source mounting 110 is pivotable about a horizontal axis , thereby allowing the source 20 to be rotated between a position wherein the x - ray beam is aimed at the floor , and a position wherein it is aimed at a wall . returning briefly to fig1 it can be seen that this is advantageous in that the source 20 may be used either for taking x - rays of a patient disposed on a radiographic table 90 , or of the patient standing in front of the x - ray stand 30 . the second range of motion made available by source assembly 10 is the reciprocable motion depicted by reference number 120 . this motion is motion away from and toward the wall 60 serving as a reference point in this description . by means of such reciprocable motion , x - ray &# 39 ; s may be taken of a stationary patient at varying distances from the wall 60 . since previous source mounting systems have not included such movement relative to the wall 60 , the same images could be obtained only by moving the patient relative to the x - ray source . such patient movement is no longer required with the source assembly 10 according to the invention . the third range of motion offered by source assembly 10 is depicted by reference numeral 130 . this motion is essentially a pivoting motion in a horizontal plane . when the source is pivoted in this plane , it can be folded back to a position where it is adjacent to either the wall 60 , or to other components mounted on that wall . such a position may be particularly advantageous in that the x - ray source 20 can be removed as an obstacle from the room , while still maintaining all the other advantageous functional features offered by source assembly 10 . in continuing reference to fig5 the various components which provide for the advantageous ranges of motion can be seen . these components include a base member 150 . base member 150 is illustratively mounted to a carriage moveable on a stand , as seen in fig1 . the base member 150 horizontally projects away from that carriage , and away from the mounting wall 60 . member 150 includes a top plate on 152 and a bottom plate 153 , and includes an open interior space 154 . a tubular member 160 , which in this embodiment has a square cross - section is pivotally mounted to base member 150 by means of pivot pin 162 . the proximal end of tubular member 160 is received within opening 154 in the base 150 . opening 154 thus allows tubular member 160 to pivot about the pivot point 162 . tubular member 160 serves to extend the distance between the x - ray source , and the wall 60 . this extension away from wall may become an obstacle under certain circumstances , and accordingly the tubular member 160 is pivotable about pivot point 162 to a position wherein x - ray source 120 is adjacent the wall 60 . such a position of tubular member 160 , and x - ray source 120 is shown in fig4 . returning to fig5 further extension of source 20 away from wall 60 is provided by means of a stem 170 . stem 170 is journalled within an interior passage way 165 within tubular member 160 for reciprocable motion with respect thereto . thus , the distance of source 20 from wall 60 may be adjusted by means of adjusting the relative position of stem 170 and tubular member 160 . rotational motion about a horizontal axis is provided to source 20 by means of source mounting 110 . in addition to a face plate 180 for mounting to the x - ray source , source mounting 110 also includes a cylindrical collar 185 . the cylindrical collar is journalled over the distal end of stem 170 , to provide rotational motion with respect thereto . to provide for a reliable fixing of the source 20 at a variety of positions , source assembly 10 includes a position retaining system . each range of motion of source assembly 10 has its own latch or other position - retaining device associated with it . in reference to fig5 for the range of motion 100 , a three component position retention assembly 200 is used . assembly 200 first includes a t - shaped handle 201 . t - shaped handle 201 is threaded and received within a threaded collar 202 by means of rotation of the handle 201 , the distal end of t - shaped member 201 engages one of several angularly spaced detents 203 in stem 170 as shown in fig6 thus preventing collar 185 from being able to rotate on stem 170 . a spring loaded , electrically actuable solenoid 193 is also part of assembly 200 . solenoid 193 , also shown in fig6 includes a central spindle biased into engagement with a series of angularly spaced detents 194 . electrical actuation of solenoid 193 , by means of a switch ( not shown ) pulls the spindle out of engagement with detents 194 to allow rotation of the collar 185 stem 170 . since both solenoid 193 and t - shaped handle 201 engage detents on stem 170 , both must be disengaged to provide for rotation of collar 185 . typically , solenoid 193 is first energized to release the spindle from detents 194 . the operator then unscrews t - shaped handle 201 and uses the t - shaped handle as a gripping point for rotating source 20 . as an alternative the end of handle 201 could be spring biased into engagement with detents 203 , instead of threaded in . the third component of assembly 200 is a magnetic clutch . three magnets 192 are mounted on a support 194 fixed to collar 185 . a clutch plate 191 is fixed to stem 170 . engagement of magnets 192 with clutch plate 191 prevents unrestrained rotation of collar 185 about stem 170 when both solenoid 193 and t - shaped handle 201 are disengaged . rather , the magnetic clutch offers smooth rotation of collar 185 between positions . similarly , the range of motion in fig5 depicted by reference numeral 120 is controlled by means of assembly 220 . 220 includes a t - shaped handle 221 which is threaded at its distal end and received within a threaded collar 222 . rotation of t - shaped handle 221 causes engagement of the distal end of member 221 with one of a plurality of longitudinally spaced detents 223 , in stem 170 ( fig6 ), thus locking it against further horizontal reciprocation within tubular member 160 . alternatively , handle 220 may be spring -- biased as opposed to threaded into engagement with detents 223 . a spring loaded solenoid 225 also controls the reciprocating movement of stem 170 . solenoid 225 includes a spindle 226 biased by a spring into engagement with detents 227 spaced in stem 170 . actuation of solenoid 225 by a switch ( not shown ) causes spindle 226 to disengage detents 227 . as with assembly 200 , electrical solenoid 225 is typically first actuated to disengage spindle 226 from detents 227 . thereafter , the operator can manually disengage handle 220 from detents 223 to allow movement of the stem 170 . the range of motion indicated by reference numeral 130 in fig5 is restricted by means of an engageable latch mechanism 230 the operation of which can be better understood by reference to fig4 . base member 150 includes receiving notches 152 . although only three receiving notches 152 are shown in the present embodiment , any plurality of such notches could be used . latch mechanism 230 includes a horizontally disposed latch member 231 which selectively engages in a receiving notch 152 to lock tubular member 160 in a given orientation . movement of the latch member 231 is controlled by a finger tab 232 . to positively lock latch 230 into position , latch member 231 is biased into engagement with slots 152 by means of a coil spring 235 which surrounds the stem of latch member 231 . source assembly 10 also includes means for insuring smooth operation of the apparatus as source 20 is moved through the various ranges of motions provided by source assembly 10 . in reference to fig5 the smooth nature of the reciprocal movement of stem 170 with respect to tubular member 160 is provided by complimentary blocks , illustratively formed of nylon , and designated by reference numerals 270 and 280 . each block 270 , 280 includes a central circular cross - sectional recess for receiving circular stem 170 . moreover , each block 270 , 280 is journalled for sliding movement relative to the interior surface of tubular member 160 . while block 270 is so journalled , it does not move with respect to 160 . rather , it is fixed in place at the distal end of tubular member 160 by means of screws 272 . in reference to fig6 it can be seen that block 270 also includes through - passages which allow access by the latching mechanisms to detents 223 and 227 , respectively . returning to fig5 it can be seen that rear block 280 is adapted for slidable movement within tubular member 160 . stem 170 is fixed within the central hole in block 280 by means of a pin 285 . thus , as stem 170 moves outward in the sense of fig5 block 280 slides outwardly along with it . the snug journalling of block 280 within tubular member 160 insures smooth and well supported motion of the stem 170 in both outward and inward directions . blocks 280 and 270 also combine to present a limit to the outward motion of stem 170 . when the front face of block 280 engages the rear face of block 270 , further outward movement of the stem 170 is prevented . smooth operation of source assembly 10 is also facilitated by the magnetic clutch mechanism previously described . magnets 192 engage a circular plate 191 to prevent sudden rotational movement of mounting 110 after solenoid 193 and handle 201 are disengaged from the stem 170 . similarly , vertical movement of the source 20 is made smoother and less jerky by inclusion of the counter weight 75 shown in fig1 and previously discussed . overall , the functioning of source assembly 10 , and the carriages to which it is attached , provide a smooth and reliable operation and movement without the need for undue exertion on the part of the operator . the ranges of motion provided to source 20 by means of the source assembly 10 allow a wider variety of x - ray images to be taken by a single x - ray source . in the environment view of fig1 the source 20 is shown directed toward the top of a radiographic table 90 . various images of a patient reclining on table 90 could be taken by taking advantage of the various ranges of motion provided for by assembly 10 . moreover , by rotation of the source 20 about a horizontal axis , the source could be directed at stand 40 , for the purpose of taking an x - ray of a standing patient in that position . fig2 shows an elevational view of the position of source 20 as shown in fig1 . fig2 also shows the location of the x - ray film cassette 250 as is necessary for taking x - ray images of a patient reclined on radiographic table 90 . fig3 shows an alternative position for source 20 , made possible by means of the source assembly 10 . in the position of fig3 the source assembly has been rotated in the horizontal plane so that it is in the position shown in the plan view of fig4 wherein the source is disposed adjacent to the wall 60 . at the same time , source 20 is rotated so that the x - rays are emitted from the source 20 in a path roughly parallel to the floor . accordingly , a film stand 251 may now be placed on radiographic table 90 . this would allow , for example , x - ray of an arm resting on the top surface of radiographic table 90 . advantageously , this x - ray may be taken with the patient seated near the table , as opposed to having to be taken with the patient either standing or reclining on the table 90 . it will be appreciated by one skilled in the art that the ranges of motion provided by source assembly 10 , according to the invention , make possible the taking of x - rays at a variety of positions which were not available by previous designs . further , various modifications to the disclosed source assembly 10 will be apparent to those skilled in the art . all such modifications and equivalents are considered to be included in the scope of the invention as defined by the following claims .
an apparatus for supporting an x - ray source in a space having at least one wall and used for exposing patients to x - ray radiation , the apparatus comprising : an upright support member mountable adjacent to the wall ; a slidably movable carriage supported by the support member and slidable thereto for planar movement in a plane parallel to the wall ; a source assembly mounted to the slidable carriage , and adapted to receive the x - ray source , the source assembly including : a horizontally projecting base member fixed to the carriage ; a horizontally extending tubular member pivotally mounted to the base member for pivotal motion in a horizontal plane ; a stem receivably journalled within the tubular member for horizontal reciprocation with respect thereto ; and a source attachment fixed to the source and including a collar journalled around the stem to provide rotational movement in a vertical plane about the stem .