US 2771330 A
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Description (OCR text may contain errors)
Nov. 20, 1956 FIG. I
w. ZAALBERG 2,771,330
TILTING MECHANISM FOR x-RAY EXAMINATION TABLE:
Filed July 6, 1954 lNvENToR WILLEM ZAALBERG www, am!
TILTING MECHANISM FOR X-RAY EXAMINATION TABLE Willem Zaalberg, Leiden, Netherlands, assignor, by mesne assignments, to Smit-Rontgen N. V., Leiden, Netherlands, a limited liability company of the Netherlands Application July 6, 1954, Serial No. 441,513 Claims priority, application Netherlands July 8, 1953 1 Claim. (Cl. S11- 6) The invention relates to a tilting mechanism for an X-ray table, adapted to tilt the table from the horizontal position in two directions about an axis arranged transversely to the table and at a height above the lloor smaller than half the table length, to such an extent that the plane of the table top is vertical. With such an arrangement the patient which is lying on the table or standing against the tilted table may be brought at any desired angle of slope. Below the table when it is in the horizontal position or behind the table in another position a space should be available for positioning an X-ray tube adapted to be separately displaced with respect to the table and/ or to be movable together with the table, while in a frame adapted to be displaced with respect to the table a radioscopic screen and/or a iilm casing is to be arranged which should be adapted to be brought above the patient lying on the table or standing against the table. In order to be able to observe the image on the radioscopic screen easily when the position of the table is horizontal, the table must not be too high, e. g. not higher than 80 cm. This means that the transverse axis about which the table should be tilted to both sides will be located relatively low, in any event lower than 80 cm. On the other hand the table should be of sufficient length (200 cm. or more) in connection with the length of the body of the patient, and the construction of the moving mechanism should be arranged in such a manner that the table may nevertheless be positioned vertically without the lower end of the table in question striking the oor.
An object of the invention is to provide an arrangement of simple and robust construction which meets the said requirements.
It is another object of the invention to provide a tilting mechanism that is self-braking.
As the moving mechanism of the table according to the invention only needs to have a limited width in spite of its robust construction, it does not detract from the stability of the device to arrange the tilting mechanism near one of the longitudinal edges of the table, whereby a large space is available below or behind the table for variably positioning an X-ray tube.
The invention will now be explained in detail with reference to the drawings, in which a preferred embodiment of a table according to the invention is described.
Figure 1 shows the patient table with the principal parts of the moving mechanism in elevation, one of the side walls of the said table being deleted.
Figure 2 indicates a sectional view according to the line 2 2 in Figure l.
With the embodiment according to Figs. 1 and 2 a toothed segment 4 in the form of a sector comprising a ring gear 6 with teeth on the inner and outer circumference thereof is arranged on a base 1. The base extends transversely with respect to the table and has at one of its ends an upstanding post 2, to which the toothed segment is attached by means of a bolt 5.
PtentedNov. 20, 1956 Furthermore asupport 7 is mounted on a bolt 3 supe ported in the post 2, the said support being adapted` to pivot on the said bolt. In the side wall of the support 7 opposite to the toothed segment 4 guiding slots 8 are arranged near the upper rim of the toothed segment, in whichl slots a guiding member 9 engages, the member 9 being integral with a downwardly extending longitudinal ce y rim 10 of the table. In the horizontal position of the.
table shown in Fig. 1 the guiding member 9 extends some distance beyond the support 7 on both sides thereof.
l i Near the table top 11 a shaft 12 is arranged in the longitudinal direction of the table, said shaft being supported at its ends in bearings 13. This shaft may be actuated by means of a worm gear 14 and an electric motor 15. Furthermore the shaft 12 passes through two bearings 16 xed to the upper edge of the support 7. Between the last-named bearings gearing in the form of a worm 17 is arranged on the shaft 12. Said worm is slidable along the shaft 12 but they cannot rotate with respect to the said shaft because a key (not shown) arranged at each of the Worms extends in a key groove in the shaft. The Worm 17 engages the teeth on ring gear 6 at the periphery of the toothed segment 4 in the form of a sector. A rack 19' is arranged near the upper edge of the table, extending through the greater part of the length of the table and parallel to the shaft 12. Two ixedly interconnected pinions 20 and 21 are rotatably mounted on the support 7, the pinion 20 engaging the inner toothed circumference of a ring gear segment 6 and the pinion 21 engaging a toothed rack 19 having normal teeth.
The moving mechanism of the patient table operates as follows: When the table must be brought from the horizontal position shown in Fig. 1 in the vertical position, e. g. by tilting in a direction opposite to the clockwise direction, the shaft 12 is actuated in such a direction that the worm 17 moves along the stationary toothed segment 4 in the form of a sector to the left and downwardly, so that consequently the support 7 and the table are driven and turn about the bolt 3 so that the table is gradually tilted to the left. The pinions 20 and 21 are rotated by engagement of the inner toothed circumference of ring gear 6 and pinion 20. Rotation of pinion 20 causes rotation of pinion 21 and thus rack 19' is also actuated with the consequence that the rack 19 and the parts 9, 10 and 11 connected therewith are moved to the right and upwardly with respect to the support 7. The mechanism is dimensioned in such a manner that the table can reach the vertical position without the lower end in question of the table abutting on the floor on moving to the vertical position, while in the nal position the table edge is near to the floor.
As is shown in Fig. 2 all parts of the moving mechanism, with the exception of the electric motor, are located within the width of the upstanding post 2 on one side of the table. By this means a very large space is left below or behind the table for positioning an X-ray tube adapted to be displaced with respect to the table, which tube may in this manner easily be brought to all desired points for screening or for exposures.
It is thought that the invention and its advantages will be understood from the foregoing description and it is apparent that various changes may be made in the form, construction and arrangement of t-he parts without departing from the spirit and scope of the invention or sacricing its material advantages, the form hereinbefore described and illustrated in the drawings being merely a preferred embodiment thereof.
In an X-ray examination table the combination of a base, a support pivotally mounted on said base, a table slidable in its longitudinal direction on said support, the
. y 3f v v. pivotal mounting of said support being horizontal and perpendicular to the 1ngit'udial`diectin of"said`tble and being located at a height above said base which is less thanhalf the length of saidtable, an electricmotor nountedhn sai-dftablea Worm actuated'directly b`y said electric" motor. rotatably. mounted on saidA support, a toothedi segment i'ntheform of' a' sector concentric to said pivot and' ixedj to said basesaid toothedv segment comprising a ring gear hayingteethon the Vouter-cir-v cumference thereoffengaged with said.wo1m, andhavin'gteethon` the'inner circumference thereof, a toothed rack mountediongitudinally of said tab1e, a smaller and aglrgerjpinion' fixed tojeach other androtatablymounted oirsaid support; said smaller pinion engaged with the inner-'circumferenceof said toothedsegment andi the.15
larger pinion engaged with said rack, whereby actuating said'wrm effects tilting ofthe table about saidpiyot by action on said toothed segment and rectilinear displacement of the table relative to the support in a direction tangential to the toothed segment by action on said smaller and larger pinion;-
RefrencesCitedrin thele'of this patent UNITED STATES PATENTS Koerner etal; Feb.` 8, 1955