US2147601A - Bucky grid actuating device - Google Patents

Bucky grid actuating device Download PDF

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US2147601A
US2147601A US11335736A US2147601A US 2147601 A US2147601 A US 2147601A US 11335736 A US11335736 A US 11335736A US 2147601 A US2147601 A US 2147601A
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valve
bucky grid
cylinder
grid
bucky
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Edwin S Flarsheim
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Liebel-Flarsheim Co LLC
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Liebel-Flarsheim Co LLC
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    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21KTECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
    • G21K1/025Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation

Description

Feb. 14, 1939. E? s. FLARSHEIM 2,147,601

' BUCKY GRID ACTUATING DEVICE I Filed Nov. so, 1936 3 sheets-sheet 1 zzgl.

lll

Feb. 14, 1939,

E. S. FLARSHEIM BUCKY GRID ACTUATING DEVICE Filed Nov. so, i936 5 sheets-sheet 2 INVENTOR ATTORNEYS Feb. 14, 1939. E s FLARsHElM y 2,147,601

BUCKY GRID ACTUATING DEVICE Filed NovQ 50', 193e 3 sheets-snee@ 3 INVENTOR.

*ZI-Qui? BY k n ATTORNEYJ Patented Feb. 14, 1939 i UNITED STATES PATENT OFFICE.

BUCKY GRID ACTUATING DEVICE Application November 3 0, 1936, Serial No. 113,357

11 Claims.

This invention relates to X-ray apparatus, and particularly to mechanism for regulating the speed of travel of bucky grids which are 'conventionally interposed between the subject matter being X-rayed and the sensitized plate to screen out secondary radiation. The grid is moved above and across the sensitized plate while the picture is being taken, and the opaque strips, usually lead strips, accomplish the specified screening function. l

It is desirable that a predetermined motion be imparted to the bucky grid in its travel across the sensitized plate. One type of bucky grid actuating device, in which mechanism is employed for determining and controlling the speed of travel of the bucky grid, is found in Patent Number 1,945,499, issued t me January 30, 1934. ',Ihis invention finds ready application to the apparatus of the patent mentioned above. Its concern is with the question of speed and the problems resulting from it in the split second operation and control of a high speed bucky grid.

With the advent of higher speed X-ray apparatus, wherein the picture is taken at an increasingly greater speed, it follows that the grid must be operable at a speed commensurate therewith. Absolute and sensitive control is necessary to achieve perfect timing. Moreover, due to the fact vthat the grid moves across a relatively short space at high speed and must be stopped within this space, the problem'of `concussion and jar occurring at the stops is presented. This heavy jar `Sets up vibration having a damaging effect on the picture, and in addition displaces and damages the mechanism.

It is therefore the object of this invention to provide a bucky grid operating apparatus for high speed usage which is accurately controlled and timed for split second operation, which does not permit slamming of the grid into the stops, but prevents shock or concussion by a cushioning action at the end of grid movement, which is effective despite the extreme velocity of the grid and which apparatus, therefore, solves all the problems of high speed bucky grid operation.

Other objects and further advantages will be more fully apparent from a description of the accompanying drawings, in which:

Figure l is a fragmentary top plan view of the bucky grid assembly showing the improved mechanism.

Figure 2 is an enlarged sectional view taken on line 2 2, Figure 1.

Figure 3 is a fragmentary enlarged sectional view showing the parts spread out and illustrating the control means for the operating mechanisms of the bucky grid.

Figure 3A is an enlarged sectional view of the piston shown in Figure 3. Figure 4 is a fragmentary partly sectional view of a portion of the bucky grid shown in Figure 1, but showing the grid in the last phase of its movement during the taking of a picture.

Figure 5 is a fragmentary sectional view taken similarly to Figure 3 illustrating the control -10 means in detail in its position when the bucky grid is slightly beyond the position shown in Figure 4, movement having just terminated.

Figure 6 is a sectional View taken on line 6 6, Figure 5, detailing the control valve incorporated l5 in the oil circuit controlling the movement of the bucky grid.

Figure 7 is a sectional view taken on line 1 7, Figure 5, illustrating the time setting means for positioning the valve for determining the speed at which the bucky grid travels across the sensitized plate.

Figure 8 is a fragmentary View taken similarly to Figure 1, but showing a modied form of the invention. 25

Figure 9 is an enlarged fragmentary view of a portion of Figure 8, showing the control or decelerating means operated for slowing down the bucky grid in the nal phase of its movement.

Figure l0 is a sectional view taken on line IIJ- 30 I0, Figure 9, detailing the auxiliary or decelerating valve.

Figure 11 is a sectional view taken on line I I-f Il, Figure 8, showing the decelerating valve in opened position.

Figure 12 is a sectional View taken similarly to Figure l1, but showing the valve in position for decelerating bucky grid movement.

' The bucky grid I0 is not shown relative to the X-ray lamp, and its detailed arrangement rela- 40 tive to the sensitized plate and table are not fully illustrated, since this mechanism is well understood in the art and is conventional. For the -purposes of this invention, the bucky grid I0 is shown slidably mounted in a frame Il, for movement above and across the sensitized plate l2, lying therebeneath,

Referring specifically to the drawings, the bucky grid l0 includes lugs i3, two one each side thereof. These lugs on one side are slidably mounted on respective rods I4 carried by brackets l5 of the frame Il. On the other side, the lugs are slidably mounted on the side wall of the frame.

As illustrated in Figure 1, the bucky grid Il) is manually set on its mounting for subsequent operation or automatically controlled return, by means of a lever I6 fulcrumed on the frame as at I1, and having one end engaging a lug I3 of the bucky grid. A pull rod I8, guided through the frame II has one end attached to the end of the lever opposite the bucky grid engaging end, and its outer end provided with a knob I9. A spring 2U, disposed under tension between the lever and the frame toward the actuating end of the lever, returns the setting means (lever I6, rod I8, and knob I9) to its normal or original position automatically after the bucky grid Vactuating mechanism has been cocked.

A coil spring 2I is disposed under tension between the frame II and an extension 22 of the lug I3, thus exerting a constant return force on the bucky grid. The bucky grid is held against the action of the return spring by means of a latch or hook element 23, which drops into the position over a co-operating hook element 24 of the frame. The latch is tripped by means of a trigger element 25, pivoted on the frame and swung into engagement with the latch by means of a pull rod 28, extending to the forward end of the bucky grid frame. The pull rod, or wire, provides an operating ring 21, and is spring returned to its normal or initial position by means of a coil spring 28 under tension and connected between a cross member of the frame and the pull rod.

The frame II includes a cross rail IIa at the end containing the control mechanism, the cross rail defining the chamber containing this mechanism. The brackets I5 which slidably support the bucky grid are mounted on this cross rail I Ia.

An arm 29 extends from a bearing bracket I3, and is rigidly connected with the outer end of a piston rod 33. A cylinder 3l, including cylinder heads 32 and 33, is attached to the wall Ia of the frame by means of screws 34-34 extending through the cylinder heads into the wall I Ia. of the frame. The piston rod 30 extends through the cylinder head 32 and has screw threads on its outer end upon which is a pair of nuts 35, which adjustably secure the rod to the arm 29 so that the position of the piston 3S may be adjusted relative to the bucky grid. As stated, a spring 2l is provided for moving the bucky grid above and across the sensitized plate while the picture is being taken. This spring 2l is disposed parallel with the piston rod and exerts a direct pull action .on the bucky grid through the arm connection The piston rod, it will be noted, extends through one end of the cylinder and is of extremely small diameter or small cross section. This light rod is possible due to the fact that the return force, as imparted by the spring 2l, is a pull force and there is no tendency to buckle the rod or destroy its alignment. Moreover, it is easy to pack this light rod in the cylinder head for there is less area or leakage surface. For the purpose of this packing, a plurality of washers 31, preferably of leather, is disposed snugly about the rod within a concentric recess 33, in the cylinder head 32. A nut 39 is screwed onto a boss 40 and urges a spring 4I under compression against these washers 31 tending to press and expand them within the recess 38 and against the piston rod.

For the purpose of the by-passage of the fluid `used in the cylinder, preferably oil, the cylinder heads 32 and 33 are extended laterally (see Figure 3) and each extension includes a passageway 42. A pipe 43 is attached between the lateral extensions and connects the passageways 42-42. Since the passageways 42-42 are in connection with the cylinder, this pipe establishes a circuitous path or by-passage for the iiuid. The cylinder 3l, heads 32-33, and pipe 43, are held in assembly, with the cylinder and pipe maintained in socketed position in the heads by means of the attachment of the heads to the frame. A filter screen 44 is interposed in the fluid passage between the head 33 and the cylinder 3l.

Two valves are inserted in the uid passageway. One is a fluid displacement control valve 45, and s included in the piston 3S, for automatically opening a passage through the piston to permit idle ilow of oil therethrough when the piston is being set or cocked by setting the bucky grid. The other of these valves is a manually or automatically operated bypass control valve 46, mounted in the extension of the cylinder head 32 in the iluid passageway 42. This latter valve functions for permitting and controlling the effective bucky grid movements, governing the passage of. oil as the spring 2| acts to return the piston and the bucky grid.

The valve 45 in the piston 36 is illustrated in detail in Figure 3A. In this View it is closed, assuming that the piston is starting its path of travel under the influence of the spring 2|. The valve element 45 is rigidly attached or carried on the inner end of the piston rod and constitutes the connection of the piston rod to the piston. The piston includes a bore having a shouldered internal flange 41 included intermediate the bore length. The Valve element 45 has a head 48 having a serrated or grooved periphery for uid passage. The head 43 of the valve element is slidably mounted in the end of the bore opposite to the extent of the piston rod and a sleeve portion 49 of the valve element is extended loosely through the piston, clearing the bore in the internal flange 41.

A sleeve element or spring retainer 50 is malntained on the end of the sleeve at the end opposite its head by means of a nut 5I on the valve element. This sleeve element or spring retainer 50 includes a head engaged against a compression spring seated against the internal iange 41 of the piston. The head of the spring retainer clears the piston bore and longitudinal slots 52 in the opposite end thereof entering an enlarged bore portion 53 of the spring retainer 50 to open the fluid passage through the piston when the valve is open or unseated.

Therefore, when setting of the bucky grid occurs, it moves the piston rod, and the piston rod is not effective for moving the piston until the valve element has been moved within the piston and unseated, and the spring retainer has engaged the piston. Thereafter, the piston may be moved to a set position due to the relief of fluid therethrough, although the manual control bypass valve 46 may be closed at the time.

The valve 46 is of rotatable type and is adjusted by rotation either manually or automatically in accordance with the invention as hereafter described. The valve includes a valve body mounted in the passageway 42 in an enlarged chamber thereof. The valve body is tubular and is closed at its outer end, its bore being aligned with the portion of the passageway 42 extending to the pipe 43. The passageway 42 enters the valve chamber at right angles thereto. A circumferentially tapered groove 55 is formed in the valve body adjacent to the passageway 42 and a radial aperture 56 connects the groove to the bore of thevalve body (see Figure 6). The valve stem is sealed in the cylinder head at the point where it extends to the exterior by means of a packing identical to that used for the piston the spring and as permitted by the by-passage of iluid through the valve 46, will occur.

In order to permit displacement of oil such as Occurs because of temperature change and because of the entrance of the piston rod into the cylinder, a metal bellows 58 is provided. This bellows is attached to the cylinder head 33 and communicates with the passageway 42 and, therefore, the fluid system by means of a nipple 59.

For the bellows, a plurality of annular folds 60 is formed of sheet metal and a head 6l is provided at each end. A bracket 62 supports the outer end of the bellows by means of the slidable engagement of a stud 63 extendedV axially from the head through the bracket. Expansion and contraction of the bellows is permitted by the slidable support.

Therefore, the fluid system is flexible despite its sealed conditions and the problems arising from the use of a piston rod extending only from one end of the cylinder, and the expansion and contraction of the oil as occasioned by the temperature change are taken care of.

Thefollowing apparatus is provided for manual and automatic setting of the valve 46. The valve stem 64 extends substantially to the end wallof the frame II. The rod is sectional and is provided with a universal joint to allow a certain amount of flexibility in order to prevent binding at the valve and to permit expansion and contraction. For this purpose the adjacent ends of the section carry coupling elements 65-85 (see Figures 2 and 3) secured to the respective sections by means of screws 66. A spring plate disc B1 is interposed between the coupling element 65-65 and has its margin secured to these coupling elements. Each element is secured to the disc at diametrically opposite points by means of rivets 68, the connections to the respective coupling elements, therefore, being at right angles to each other. The elements are recessed so as to provide clearance for flexing movement of the disc in either direction.

The valve stem 64 is manually rotatable by means of a knob 59, having a stem 'llll rotatably mounted'in a bearing element 1I fixed in a face plate 12, which plate in turn is attachedi to the end wall of the frame Il. The stem of the knob has a gear 'i3 xed thereto, in mesh with a gear 'i4 axially attached to the valve stem 64 through a sleeve l5. A coil spring 16 (Figure 5) under compression is disposed within a recess 'l1 of the bearing member 1| and engages the knob 59 for frictionally holding the gear in any set position by virtue of contact with the bearing member 1|. l

The valve stem 64 is supported at its actuated end by means of a bracket 18 attached to the side wall lla of the frame. The sleeve 15 carries a graduated dial element 19, the graduations of which are visible through a sight opening 3|] in the face plate l2 and are movable in relation to a pointer 8|, formed in the margin of the sight opening. The graduations indicate periods of exposure or, in other words, the elapsed time of* the bucky grid travel.

The sleeve element l5 and, therefore, the sleeve stem which is axially disposed within it, are additionally supported and held in axial alignment by means of a centering element 82, disposed within the bore of the sleeve and'xed to the face plate by means of a screw 83. The manual adjustment movements of the knob 69 are conveyed to the valve stern from the sleeve i5 to a collar 84 which is fixed to the valve stem.

Because of the automatic movement of the valve stem imparted through the cushioning means hereinafter described, it is essential that there be clearance between the sleeve l5 and the collar S4. For this reason, a tooth extension 35 of the sleeve 'i5 is adapted to engage with a tooth extension of the collar 84. The rotative clearance between these teeth 85, 85, is sufficient to permit the automatic bu'cky actuated closing of the valve and the cushioning action Without altering the setting of the manually operable knob 69.

'Ihe valve 46 is automatically moved to a closed position for bringing the bucky grid to a cushioned or evenly decelerated stop by means of a cam 8l carried by the bucky grid, being attached to an arm I3 thereof. This cam provides a curved surface adapted to engage a pin 88 of a collar 89 secured to the valve stem. A coil spring 9i) is fixed to the valve stem having one terminal attached to the nearest coupling element, and the other terminal attached to the frame through the bracket 'i8 at its other end. This spring 90 is disposed about the valve stem and is a winding spring holding the valve in its manually set positions and returning it to those positions when the cam element ill? is moved away from its cooperating cam, namely the collar 89 and pin 88 on the valve stem.

Assuming that the guide and the control mechanism have been set or cocked as shown in Figure 1, that is, drawn into starting position through manual operation of the knob i9, the operation is as follows: The operator determines the timing of the picture and sets dial 19 to the appropriate position with respect to the pointer 8i. Although the winding spring places a constant force on the valve stem, the dial will remain in set position due to the frictional engagement of gear 13 with the bearing element 7l. The bucky grid is then tripped by way of the trigger control through the ring 2l. The bucky grid then moves across at a speed determined by the position of the valve and the rate at which the oil can flow through the bypass. As it reaches the end of its travel, the cam element on the valve stem, namely, collar 89 and pin 88, will be engaged by the cam 8l, whereupon the valve stem will be rotated in valve closing direction. The closing of the valve is relatively gradual due to the flat curvature of the cam, and stopping will occur before, or at the precise moment at which, the buffers 9| engage the end wall of the frame, thereby, preventing shock or vibration resulting from impact. When the bucky grid is moved back in a resetting operation, the rotative clearance between the collar 84 and the sleeves 15 permits valve return to set position as determined by the position of the knob 6l, this return being entirely independent of the manual valve setting means. When the bucky grid is again cocked, the movable cam element on the valve stem will return to its normal position under the action of the coil spring SQ, and the parts 'l5 and 8 4 will be in rotative contact for` timing change through the knob 61 if desired VIn the form oi the invention shown in Figures 8 to 12, auxiliary valve |00 is provided. The bucky grid` speed control valve is not automatically moved inthe preceding form. The control valve in this form is the same as the valve found in latent No. 1,945,499, with the exception of the manually actuating mechanism thereof described in the preceding form. In other words, in the second form of the invention (Figures 8 to 12 inclusive) the manually set valve is not automatically moved during the bucky grid stroke. The bucky grid speed control valve 46 and the setting means therefor are the same as in the preceding form except that the automatic bucky grid actuated means is omitted.

The auxiliary Valve |00 is in the form of a segmental plate lying against the inner side of the cylinder head 33 and mounted on a rod |0|, oiset from the axis of the cylinder. The valve plate includes a circular notch |02 in its edge, registering with the port |03 connecting the cylinder to the bypass 43 through the passage 42. The valve rod 20| has its outer end rotatively mounted in a bearing plate |04 extending from one of the brackets 5 fixed to the frame ||a. The rod is suitably packed at its entry into the cylinder head 33 in the same manner in which the valve rod or the main control rod is packed.

The rod |0| carries two cam elements |05 and |06 respectively, consisting in each case of sleeves, adjustably fixed on the rod by means of screws |01 and radially extended pins |08. A cam |09 is fixed to the side of the bucky grid by means of a bracket H0. The cam |09 consists of a plate including cam surfaces and ||2 respectively. The cam surfaces, of course, are angularly related to the path of movement of the bucky grid or the axis of the rod |0|, and are adapted to engage the cam elements |05 and |06 respectively. Cam surfaces and ||2 are virtually parallel. The surface engages the pin of cam element |05 for rotating the valve |00 to partially closed position in the nal phase of bucky grid movement for the decelerating action previously described. The closing movement of the valve |00 is limited to the partially closed position as shown in Figure 12 by contact with the wall of cylinder 3| as shown at I3. The open position of the valve is determined in the same manner as shown in Figure 11, the Contact point being indicated at I4. The rearward surface 2 engages the cam element |06 (which has been moved into the path of this surface) upon the return or setting movement of the bucky grid. This latter action returns the valve to normal, fully opened position, as shown in Figure 11.

Having described my invention, I claim:

1. A mechanism for controlling the speed of motion of a bucky grid and decelerating the same, comprising, a cylinder, a piston in said cylinder connected to said bucky grid, a valve in said piston opened by return movement of the bucky grid, said cylinder including a ley-passage connecting the ends thereof, said cylinder and by-passage substantially completely lled with liquid, a valve in the liquid circuit formed by said cylinder and said by-passage, cooperating elements on the bucky grid and in connection with the valvev operative in the nal phase of bucky grid movement for gradually closing the valve and gradually decelerating the bucky grid.

2. A mechanism for controlling the speed of motion of a bucky grid and for decelerating the same, comprising, a cylinder, a piston in said cylinder connected to said bucky grid, said cylinder including a ny-.passage connecting the ends thereof, said cylinder and by-passage being substantially completely lled with liquid, a control valve in said by-passage, means for setting said control valve for a timed movement of said bucky grid, and a bucky grid actuated decelerating valve in the liquid circuit of said cylinder and by-pas- Sage..

3. A mechanism for controlling the speed of motion 0f a bucky grid and decelerating the same, comprising, a cylinder, a piston in said cylinder connected to said bucky grid, said cylinder including a ily-passage connecting the ends thereconnection with the valve operative in the nal phase of bucky grid movement for gradually closing the Valve and gradually deoelerating the bucky grid.

4;. A mechanism for controlling the speed of motion of a bucky grid, comprising, a cylinder, a piston in said cylinder connected to said bucky grid, a valve in said piston opened by return movement of the bucky grid. a bi1-passage connecting the ends of said cylinder, said cylinder and by-passage substantially completely lilled with liquid, a decelerating valve in said by-passage, a earn element on the bucky grid actuating the valve toward the conclusion of the bucky grid motion for automatically gradually closing the valve as the bucky grid reaches the end of its prescribed movement. and setting means for regulating the iow of liquid through the by-pas- Sage.

5.. A mechanism for controlling the speed of motion of a bucky grid and for decelerating the same. comprising. a cylinder, a piston in said cylinder Connected te .said bucky grid. said cylinder including a by-passage connecting the ends thereof, said cylinder and by-passage being substantially completely iled with liquid, a valve in said ley-passage, a manually operated valve control knob connected to said valve including graduations for showing the degree of by-passage permitted bysaid valve as determined by its position,

stops for said bucky grid and an element on the bucky grid actuating said valve for gradually closing the same toward the end of bucky grid movement whereby the-bucky grid is substantially stopped when it lengages the stops.

6. A mechanism for controlling the speed of motion 0f and. deceleratins a bucky grid comprising, a liquid filled cylinder, a piston in saidcylinder connected to. said bucky grid, valve means for controlling the displacement o f the liquid from one end of the cylinderto the other,l a control knob connected to said valve means, and means on said bucky grid engageable with the valve means in the final phase of bucky grid movement for operating the valve and therefore gradually de-celerating the bucky grid.

7. Apparatus for controlling the speed of motion of a bucky grid, comprising, a cylinder, a pistcn in the cylinder connected to the bucky grid, a` conduit connecting the ends of the cylinder for permitting movement of liquid completely lling the cylinder and conduit, from one end of the cylinder to the other, a valve in said conduit including a valve stem, a manually operated knob connected to the valve, a friction device associated with the knob for holding the knob against accidental displacement, a Winding spring exerting a rotative pressure on the valve insuflicient to displace the knob, a valve rotating device between the bucky grid and the valve for closing the valve during the last phase of movement of the bucky grid, and coupling elements between the knob and the valve stem permitting independent movement of the valve when actuated by said device, whereupon the winding spring returns the valve to the knob determined position when the bucky grid is reset.

8. A mechanism for controlling the speed of motion of a bucky grid, comprising, a cylinder, a piston in said cylinder connected to said bucky grid, a valve in said piston opened by return movement of the bucky grid, a by-passage connecting the ends of said cylinder, said cylinder and by-passage substantially completely iilled with liquid, a valve in said by-passage, a manual adjustment device connected to the valve for Varying its position, and a cam element on the bucky grid actuating the valve toward the conclusion of the bucky grid motion for automatically gradually closing the valve as the bucky grid reaches the end of its prescribed movement.

9. A mechanism for controlling the speed of motion of and decelerating a bucky grid comprising, a liquid iilled cylinder, a piston in said cylinder connected to said bucky grid, by-passage means connecting the respective ends of the cylinder, valve means for controlling the displacement of the liquid from one end of the cylinder to the other, and means on said bucky grid engageable with the valve means in the final phase of bucky grid movement for operating the valve and therefore gradually decelerating the bucky grid.

10. Apparatus for controlling the speed of motion of a bucky grid, comprising, a cylinder, a piston in the cylinder connected to the bucky grid, a conduit connecting the ends of the cylinder for permitting movement of liquid completely lling the cylinder and conduit, from one end of the cylinder to the other, a valve in said conduit including a valve stem, a manually operated knob connected to the valve stem including a graduated dial for indicating the speed of bucky grid travel as permitted by the valve, a friction device associated with the knob for holding the knob against accidental displacement, a winding spring exerting a rotative pressure on the valve insufficient to displace the knob, a cam element on the valve stem, a cam element on the bucky grid adapted to engage the cam element of the valve stem for gradually closing the valve during the last phase of movement of the bucky grid, and coupling elements between the knob and the valve stem permitting independent movement of the valve when actuated by the cam, whereupon the winding spring returns the valve to the knob controlled position when the cams are disengaged.

11. A mechanism for controlling the speed of motion of a bucky grid and for decelerating the same, comprising, a cylinder, a piston in said cylinder connected to said bucky grid, said cylinder including a by-passage connecting the ends thereof, said cylinder and by-passage `being substantially completely filled with liquid, a valve in said by-passage, a manually operated valve control knob connected to said valve including graduations for showing the degree of by-passage permitted by said valve as determined by its position, stops for said bucky grid, a decelerating valve in the liquid circuit formed by said cylinder and luy-passage and an element on the bucky grid actuating said decelerating valve for gradually closing the same at the end of bucky grid movement whereby the bucky grid is substantially stopped when it engages the stops.

EDWIN S. FLARSI-IEIM.

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591536A (en) * 1949-01-15 1952-04-01 Liebel Flarsheim Co Reciprocating bucky diaphragm
US2668913A (en) * 1949-04-05 1954-02-09 Picker X Ray Corp X-ray apparatus
US2689916A (en) * 1952-05-03 1954-09-21 Liebel Flarsheim Co Actuator for bucky diaphragms
US3173007A (en) * 1962-07-26 1965-03-09 Palmer M Maxwell Apparatus for supporting a structure for motion in response to fluid response to fluid pressure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591536A (en) * 1949-01-15 1952-04-01 Liebel Flarsheim Co Reciprocating bucky diaphragm
US2668913A (en) * 1949-04-05 1954-02-09 Picker X Ray Corp X-ray apparatus
US2689916A (en) * 1952-05-03 1954-09-21 Liebel Flarsheim Co Actuator for bucky diaphragms
US3173007A (en) * 1962-07-26 1965-03-09 Palmer M Maxwell Apparatus for supporting a structure for motion in response to fluid response to fluid pressure

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