US2605151A - Obstetrical and delivery operating table - Google Patents

Obstetrical and delivery operating table Download PDF

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US2605151A
US2605151A US8294549A US2605151A US 2605151 A US2605151 A US 2605151A US 8294549 A US8294549 A US 8294549A US 2605151 A US2605151 A US 2605151A
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slide
section
frame
movement
end
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Shampaine Hyman Robert
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Shampaine Hyman Robert
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61GTRANSPORT OR ACCOMODATION FOR PATIENTS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00Operating tables; Auxiliary appliances therefor
    • A61G13/0009Obstetrical tables or delivery beds
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61GTRANSPORT OR ACCOMODATION FOR PATIENTS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00Operating tables; Auxiliary appliances therefor
    • A61G13/02Adjustable operating tables; Controls therefor

Description

July 29 1952 H. R. sHAMPAlNE 2,605,151

OBSTETRICAL. AND DELIVERY OPERATING TABLE Filed March 25. 1949 5 Sheets-Sheet 1 Q LL.

INVENTOR HYMAN Y ROBERT SHAMPMNE www ATTORNEY July 29, 1952 H. R. sHAMPAlNE 2,605,151

OBSTETRICAL. AND DELIVERY OPERATING TABLE INVENTOR HYMAN ROBERT SHAMPAINE ATTORNEY July 29, 1952 H. R. SHAMPAINE 2,605,151

OBSTETRICAL AND DELIVERY OPERATING TABLE Filed March 25. 1949 5 Sheets-Sheet 5 INVENTOR vm RoBEBfr SHAMPAlNii ATTORNEY July 29, 1952 H'. R. sHAMPAlNE oBsTETRcAL AND DELIVERY' OPERATING TABLE 5 sheets-sheet 4 A Filed March 25. 1949 FIG. e.

' mvENToR /HYMAN ROBERT SHAMPMNE ATTORNEY 5 Sheets-Sheet 5 INVENTOR ROBERT SHAMPMNE ATTORNEY N m Y H July 29, 1952 H. R. SHAMPAINE oBsTETRcAL. AND DELIVERY OPERATING TABLE Filed March 25. 1949 Patented July 29, 1952 TAB Hyman Robert Shampaine, Clayton, Mo.

Application March 23, 1949, Serial No. 82,945

6 Claims.

This invention relates in general to medical operating tables and, more particularly, to certain new and useful improvements in obstetrical and delivery operating tables.

The primary object of the present invention is yto provide an obstetrical table which may be elevate'd. to various heights and tilted through a full range of vangular positions from the Trendelenburg position to the reverse Trendelenburg position. f

It isV another object of the present-invention to provide an obstetrical table which -is uniquely Yconstructed so that all movements may be readilyand conveniently controlledby the anesthetist from the head end of the table,

It is also an object of .the present linvention to provide an obstetrical table having a main bodysuppOrting portion andan underslung ydrawerlke leg-supporting portion arranged to move horizontally and vertically without any appreciable angular rocking or swingingmovementso,that the table can be used either as a labor bed ora-delivery table, as necessity requires, and may vibe quickly transposed from one such function tothe other smoothly and without danger of jarring or otherwise affecting the'patient.

It is another object of this invention to provide an obstetrical table having a section for supporting ya patients legs, whichsection is normally concealed wi-thin the table and is freely shiftable therefrom into outward operative posi-tion.

A further object of the present invention is to provide a -shiftable -leg .supporting section having a cushion-containing receptacle Which is Velevated by unique-means into co-planar alignment with the top surface of the tableafter the section has reached a position .forward of the table.

AnY additional object-of the present invention is to provide locking means cooperable with the cushion receptacle .whereby unauthorized depression of said receptacle is prevented 'whenthe legssupporting section is in operative position.

A further-object of the present invention is to providean obstetrical table whichis durable, economical'in construction, and reliable in operation.

With the above yand other objects .in view, .my invention resides in the novel features of.io'rm,

con'struction, arrangement, and combination Vof parts Presently describedand pointed out inthe claims.

In the accompanyingdrawings ('sheets) YFigure 1 is a side elevational view of an obstetricaltable constructedin accordance with and embodying vthe present invention;

, Figure 2 is a top ,planview of theV .Obstetrical table;

pedal extensions 4, through slots v6, l, respectively, in the rearward Figure 3 is ya longitudinal sectional -view taken along line 3-'3 of Figure 2;

'Figure 4 is an end elevational View of the obstetrical table;

Figure 5 is a transverse sectional View taken along line '5-5 `of Figure 2;

Figures 6 and '7 are sectional views taken along lines lie-Sand l-J, respectively, of Figure 1;

Figure 8 is a fragmentary sectional view take along line 8-8 of Figure 6*;

Figures 9 and' 1,0 are fragmentary sectional views taken along jlines 9-9 and lil-Hl, respectively, of vFigure '7 .Figure `1l isa fragmentary sectional AView taken along line I I-I I vof Figure 9; f

f Figure 12 is a fragmentary sectional view'taken lalong line I2,-I2 of Figure 10;`

`characters to the drawings which illustrate apre- 'ferr'ed embodiment ofthe present invention, A designates an obstetrical table 'having a generally rectangular vbase I provided with leg vformations 2 at the four .corners thereof. Concealed within eachleg formation 2 is a suitably mounted caster 3 optionally maintained in upper, locked position or'lower, rolling position by operatively connected 5, .projecting outwardly side of thebase I. suitably mounted on the base `I is a pedestal or column member 8 having'housed therein a cylinder 9 vertically shiftable by conventional hydraulically operated means (not shown) arranged for actuation by a Pedal I0 which extends outwardly through a slot I'l in the pedestal '8.

A plate-like casting I2 is secured to the upper end. face 'of the cylinder 9 by screws I3, saidl of a main frame I8 of a body-section I9, which comprises upstanding parallel side Walls 20, 2|, which, at their rearward ends (reference being had to the left of Figure l) v are turned inwardly in the (provision of relatively narrow support walls 20', 2|', with the rearward end of the body-section I9 being open therebetween, asat 22. Secured to the forward and rearward end of the upper margins of the walls 28, 2|, are the ends of transversely attending angle sections 23 and similar angle sections are secured along the upper margins of said walls 2|), 2|. Secured to the angle sections 24 are the ends of a plurality of parallel transverse slats 25 which support a pad or cushion 28 disposed over the chamberlike interior of the body-section- I9, the'latter being open at its forward end, as at 21.

The main frame I8 comprises upstanding cutout side walls 28, 28', integrally connected by transverse parallel brace bars 29, 38.

either end thereof are relatively short flanges 3| 3|', integrally joined at their inner ends to the rearward end of the sections I1, I1', respectively, which are integrally connected at their forward ends to the innerA ends of short transverse walls 32, 32', which are equal in length, and parallel to, flanges 3|, 3|'. The sections l1, |1', are further integrally connected to the side walls 28, 28', by walls 33,33', which are parallel to and positioned rearwardly of the walls 32, 32', respectively. The walls 32 and 33, and 32' and 33' are each provided on their upon margins with elevated portions, as at 34, and are joined by longitudinal-partitions 35, 35', respectively, extending therebetween in parallel relation to the sections |1, I1', respectively.

Journaled` in and projecting at its ends through the rear support wall 2 and the transverse flange 3|' is a shaft 35, rigidly provided 'on its rearwardly projecting end with a hand wheel 31. On the forward end of the shaft 35 -there is secured a bevel gear 38 meshingly engaged with a pinion 39 secured on one 'end of transverse shaft 48 journaled by bearings 48 and extending through the sections I1, I1', and suitable aperturesv in spacedrupstanding legs 4I, 4I of a bracket 452 disposed between Vthe sections I1, I1', as may best be seen in Figure 5. Secured upon the shaft 98 inwardly of the legs 4|, BI', is a bevel gear 43'engaged with a pinion M ;m'ounted on the upper projecting end of a Vvvertically dispo-sed screw shaft 45, of the socalled Trendelenburg type, extending through the bracket 42 andsupported therein by a thrust bearing A9 and a washer 41. Near its lower end the screw shaft 45 is engaged by a screw nut d8 provided with diametrally opposed relatively shallow drill-holes 49, 49', for receiving the ends of pivot bolts or. trunnion members 50, 59', respectively, mounted on opposite sides of the lower end-of a support arm 5| secured at its upper forward end by screws to the casting I2.

By rotation of the shaft 35 through operation of the hand wheel 31 the table I9 may be pivoted about the axis of the pivot shaft I6 to facilitate administration of requisite treatment to any particular patient. It should be noted that the screw nut 48 is pivotable about the pivot bolts 159, 49', thereby permitting the screw shaft 49 to be swung about said pivot as the screw 95 is threaded downwardly or upwardly'through the v nut 48,- as necessary, to raise or lower the bodysection I9, thus assuring operative engagement at all times between the gear i3 and the pinion Journaled in and projecting through the rear support wall 20', the fiange 3|, 'and the walls 32, 33, is a-shaft 52, parallel to and in the same plane as the shaft 38 and having mounted on its rearwardly projecting end a hand wheel 53. Secured on s aid shaft 52, intermediate'the walls 32, 33, is a worm gear 54 meshingly engaged Upstandpi' ing from the forward margin of the bar 29 vat' with a concave gear which is suitably mounted on one end of a transversely extending shaft 5B, journaled by a bearing 51 in the partitions 35, 35', and extending through suitable apertures 58 in the sections I1, I1'. Mounted on the shaft 58 by collars 59, 59', adjacent the inwardly presented face of each partition 35, 35', are spur gears 68, 60', respectively. The gears', 68', are meshingly engaged with longitudinally extending gear racks 6|, 6|', adjustably secured by screws 82, 62', to anges or Vribs 63, 63', respectively, depending from the underside of a bottom plate 64, which, as will presently be described, is a part of the actuator frame ,f of the leg section 65. Threaded through suitable apertures in the plate 64 are adjustment screws 88, 65', their lower vend. abutting against the upper margin of the gear racks 6|, 6|', respectively, whereby vertical adjustment of the racks 6|, 6|', may be accomplished.

The leg-section 55 is normally disposed in a concealedmanner within the chamber-like interior of the body-section I9, but through the driving cooperation of the spur gears 60, 68', and thegear racks 8|, 6I', respectively, the leg section 95 may be optionally shifted from said concealed position to a position forwardly of Vthe body-section |9 for supporting the legs of a patient, as will now be more fully described.

Secured to the opposite longitudinal margin ofl the bottom plate 34 are upstanding parallel side plates 61 which are outwardly anged at their upper and lower marginsin formation of a substantially rigid channel. Each of the side plates 81 is provided with a pair of spaced, camvmingslots s, each slot extends from a point adjacent the lower margins of the side plates 61 rearwardly and upwardly at an angle of approximately 60 thereto, terminating at its upper end in a second short locking-dwell 68, adjacent and parallel to the upper longitudinal margin'of the side plates 51. Also provided in each of said plates 61, rearwardly of each slot s, is a longitudinal slot 89, all as best seen in Figure'9.

Movably disposed within each slot s is a ball bearing roller 10 of the cam-follower type, mounted on a roller shaft 1|, extending through 'each slot s and having a second roller 12, mounted on its outer end. The inner end of each shaft 1I extends through a spacing washer 13 and threadedly mounted in a flange 14, depending from the side wall of a rectangular cushion-frame 15 designed to support a cushion or pad 18.

Each roller 12 is disposed between a pair of upstanding guides 11, 18, which are suitably secured to longitudinal plates 19, each being spaced outwardly from and parallel to one of the plates 51. Said plates 19, being inwardly turned at their forward margins in the provision of anges 19', are longer than the plates 61, and are connected at their rearward ends by a support bridge and at their forward ends by a spacer rod 80'.

Secured to the outer face of each of the plates 19, is a channel-shaped slide-rail 8| for cooperation with rollers 82 spacedly mounted on the inner faces of each of the side walls 20, 2|, of the frame I8. Also secured to the outer faces of each of the plates 19, and extending abovethe upper margins thereof, are channel shields 83 which are curved inwardly at their upper margin in vertically spaced covering relation to the upper margins .of the plates 81 and the guides 11, 18. (Figure 7.) Extending through each of the slots 69 in the plates 61 are roller shafts 84 threadedly mounted in blocks 85, welded or other- '.wise, suitably mounted upon the inner faces of vtheplates 19.

'Ihreadedly mounted in and extending through the plate 19 in axial alignment with each roller shaft 84 is a set screw 96 adapted 1 en'dfface of whichis welded a rocking 'arm 93, having a forwardly and upwardly presented, inclined cam face'93'. r.Inwardly of the ,rocking arm `93,

'the shaft 90 projects .through an aperture 94 in theforward end vof a bracket or stabilizing arm 95,-which is formed with an offset bend fand is .secured by bolts 99 to the inner face of the plate 19. (Figure 12.) lncircling the inwardly projecting end of the shaft 90 is a spring 91 anchored at its one end by extending through suitable apertures in the shaft 90 and anchored at its `other 'end in the bracket 95, whereby upon rotation of the shaft 90 tension may be effected on said spring 91. Pinned upon the outer end of the shaft98is a collar '98 and welded to the outer end 'face thereof is an extending stop latch 99, having 'a `'sernicircul'ar recess |89 extending upwardly 'i 'from its vlower margin'for optional locking engagement with a stop pin IOI projecting inwardly from the forward portion of the side wall 28 of the frame I8. It is to be particularly noted that the -rear portion of the' stop latch is vertically extended whereby therearward side of the recess |00 is continuouswith an elongated portion or end extension |02. (Figure 10.) Extendingoutwardly from the adjacent plate 61 is a pin member |83 disposed'for optional contact with the cam face 93 of the rocking arm 93 as will be more `fully described hereinafter.

Disposed closure-wisebetween the ends of the plates 19, is a cover platel |84 secured to the flanges 19 of the plates 19 by elongated screws i I85, each havinga spring |98 encirclingly vdisposed about its shank, said spring |66 abutting at its ends against the inner face 4of the flange 19' and washer A|81 mounted about each screw |35 adjacent a nut |08 threaded thereon.

Mounted on the outer faces of each side wall ,720, 2|, adjacent their forward ends is a swivel socket |89 for adjustably supporting a knee crutch member IIB.

.During certain stages of Achild-bearing the body-section VI9 of the obstetrical table I2, is

lemployed with ythe leg section 65 in vretracted position. As noted above, the body-section I9 ,may be elevated or depressed, as necessary, about the axis of the pivot shaft I8 to facilitate treat- .ment. However, at other stages of child-bearing,

secti0n'65 is accomplished in the following kmanner: The shaft 52 is rotated by manual operation ofthe wheel -53vwhereby through thergears 54, 55, vrotation is imparted to the transverse shaft .5.6. 'The spur gears 80, drivingly engage the gear racks 65|, 6I', respectively.

It will be noted that the leg section 65, in effect, moves in and out of the opening 21 from concealed position within the body-section I9, as shown in Figure 14, to extended position, as shown in Figure l. The cushion frame 'I5 is disposed within and forms a part of the leg section 65, being confined therein by engagement of its `four rollers 12 within the four pairs of vertical guides 11, 18. It will thus be seen that the cushion frame 15 and its associated parts cannot move longitudinally with respect to the `plates 19 and is therefore limited to up Yand down movement within the pairs of f guides 11, 18. On the other hand, the actuator frame f, also carried by and forming a part of the leg section 65, is free .to shift length-wise with respect to the leg section 65 through the short limits of movement permitted by inter-engagement between the rollers 81 and the slots 69 of the side plates 61. This inter-engagement between the rollers 81 and the slots 69, however, prevents the plates 61 from moving up and down. Thus, it will be seen that the leg section 65 carries a cushion frame 15 which is free to move only along a length perpendicular to the general Vplane of movement of the 4leg section 85 and, at the same time, the leg section 95 also ycarries kan actuator frame `f which is free to move only to a limited extent in a line which is parallel' to the general plane of movement of the leg section 65.

As the hand wheel 53 is rotated and the spur rgears tid, 855', drive the racks EI, 8|', outwardly tional resistance of the Yleg section E5 to outward movement, the actuator frame f, the cushion frame 15, and leg section Iifwill be thus held together against relative longitudinal translation and the entire leg section {i5-with allr its contained parts will be moved outwardly into extended position by the movement of the racks 5I, 6I '.-v It may be noted in this connection that 'by Aappropriate adjustment of the screws 62, 62',

64', the racks 5I, 6I', may be positioned to permit the proper amount of icontact with the gears 89, 68', to insure maximum smoothness of operation.

As the leg section 65 reaches fully extended position., as shown in Figure l, the depending end extension I 02 of the stop latch 99 will engage the stop pin IGI.

The actuator frame jf, however, is free to continue its forward movement by longitudinal translation relatively within the now'stationary leg section 65 within the limits of the length of the slot 69. Furthermore, the cushion frame 15 and `the cushion 'I supported therein are nowpositioned outwardly in the clearbeyond .the transverse end of the body section 4I9 and are free to move upwardly into elevated position. Thus, continued turning movement ofthe hand wheel 53 will cause the rack 6I, 5I', and

' the actuator frame f to lcontinue their outward longitudinal movement since the rollers 12 of the carriage frame are engaged in the angular slots s and are at the same time preventing, by reason of inter-engagement between the rollers 12 and the guides 11, 18, fromfurther longitudinal move- ,ment with the actuator frame f, the rollers'12 are brought to rest in fully elevated position.

As the cushion frame 15 moves upwardly the pin |03 moves upwardly away from engagement with the inclined cam face 93 of the rocking arm 93 and the stop latch 99 is forced downwardly under influence of the spring 97 bringing the recess into engagement with the stop pin IGI, thereby locking the leg section G5 against length-wise movement in either direction. Consequently, when the hand wheel 53 is turned in the opposite direction the first movement which takes place in the leg section S5 is a retrogressive longitudinal translation of the actuator frame f and the cushion frame 15, together with its supported cushion, is lowered into its original position wholly within the coniines of the leg section 6-5. As the cushion frame 'I5 returns to its fully lowered position the pin 503 again contacts the inclined cam face S3 of the rocking arm 93 and swings the stop latch 99 upwardly disengaging the detent |96 from the pin IBI. At the same time the rollers 'I0 will have reached the lowermost vposition in the slots s and the actuator frame f will have reached its rearwardmost position of longitudinal translation relative to the leg section 65 so that the leg section 65 and actuator frame f again begin to operate as a single unit and the entire leg section 55, together with all of its supported structure, will be withdrawn through the opening 2'! into fully retracted position within the body section I9.

It will be noted that the cover plate il!!! which extends across the outer end of the leg section 65 is resiliently held in place by the springs |65. Thus, if the fingers of either an attending nurse, physician or the appendages of the patient herself should accidently happen to become caught between the rising cushion frame l5 and the lcover plate |04 the latter would yield and any serious damage or injury would thus be avoided.

It should be understood that changes and modifications in the form, construction, arrangement, and combination ofthe several parts of the obstetrical table may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.V

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

l. An obstetrical table comprising a pedestal, a hollow bed section mounted on the pedestal and having an opening across one transverse end, an open topped drawer-like frame mounted in and carried by the bed section for lengthwise shifting movement through the opening, a leg section disposed Withiny the frameand confined therein :for upward shifting movement solely in a direction at right angles to the direction of movement of the frame, slide means carried by the frame and being longitudinally shiftable in relation thereto, locking means actuated by the leg section when the latter is in downwardly shifted position within the frame, said locking means when so actuated being engaged with the slide means for holding the latter non-shiftably within the frame, means attached to the slide means for propelling the slide means, frame and leg section as a unit through the opening into and out of the bed section, stop means carried by the frame and being engageable with the bed section vwhen the frame is in outwardly shifted position,

said leg section means'being free for upward shifting movement when the frame is in such outwardly shifted position, whereby to permit longitudinal shifting movement of the slide means after the frame has reached outwardly shifted position, and auxiliary means on Vthe slide means engaged with the legsection for elevating the leg section responsive to longitudinal shifting movement of the slide means so. that the upper surface' of the leg section is substantially co-planar with the upper surface of the `bed section. f

2. An obstetrical table comprising a bed section, a slide shiftably mounted beneath the bed section for movement in a substantially horizontal direction from retracted position in which it is disposed beneath the bed section to extended position in which it projects outwardly from one transverse end of the bed section, said slide having spaced parallel side members, substantially vertical guides carried by the side members, a cushion frame' carried by the slide and engaged within the guides so as to be capable of substantially horizontal movement with the slide and also up-and-down movement relative to the slide, and actuator means carried by the slide and shiftably connected thereto for limited translational movement relative to the slide in the same direction as the slide moves in traveling from retracted to extended position, said actuator means -being provided with cam-forming means inclined with respect to the direction of movement of the actuator means and being operatively engaged with-the cushion frame so that as the actuator means moves to and fro translationally relative to the slide the cushion frame will be shifted correspondingly up-and-down.

3. An obstetrical table comprisingV a bed section, a slide shiftably mounted beneath the bed section for movement in a substantially horizontal direction from retracted position in which it is disposed beneath the bed section to extended position in which it projects outwardly from one transverse end of the bed section, said slide having spaced parallel side members, substantially vertical guides carried by the side members, a cushion frame carried by the slide and engaged within the guides so as to be capable of substantially horizontal movement with the slideY and also up-and-down movement relative to the slide, actuator means carried by the slide and shiftably connected thereto for limited translational movement relative to the slide in the same direction as the slide moves in traveling from retracted to extended position, said actuator means being provided with cam-forming means inclined with respect to the direction of movement of the actuator means and being operatively engaged with the cushion frame so that as the actuator means moves to and fro translationally relative to the slide the cushion frame will be shifted correspondingly up-and-down, anda lock engageable with the bed section for limiting the outward movement of the slide.

4. An obstetrical table comprising a bed section, a slide shiftably mounted beneath the bed section for movement in a substantially hori- Zontal direction from retracted position in which it is disposed beneath the bed section to extended position in which it projects outwardly from one transverse end of the bed section, said slide having spaced parallel side members, substantially vertical guides carried by the vside members, a cushion frame carried by the slide and engaged within the guides so as to be `capable of substantially horizontal movement with the slide and also up-and-down movement relative to the slide, actuator means carried by the slide and shiftably connected thereto for limited translational movement relative to the slide in the same direction as the slide moves in traveling from retracted to extended position, said a-ctu- -ator means being provided with cam-forming means inclined with respect to the direction of movement of the actuator means and being operatively engaged with the cushion frame so that as the actuator means moves to and fro translationally relative to the slide the cushion frame will be shifted lcorrespondingly up-and-down, and a lock engageable with the bed section when the slide is in fully extended position and the cushion frame is in upwardly shifted position whereto to prevent movement of the slide in either direction While the cushion frame is in such upwardly shifted position.

I5. An obstetrical table comprising a bed section, a slide shiftably mounted beneath the bed section for movement in la substantially horizontal direction from retracted position .in which it is disposed beneath the bed section to extended position in which it projects outwardly from one transverse end of the bed section, said slide having spaced parallel side members, substantially vertical guides carried by the side members, a cushion frame carried by the slide land engaged within the guides so las to be capable of substantially horizontal movement with the slide and also up-and-down movement relative to the slide, -actuator means carried by the slide `and shiftably connected thereto for limited translational movement relative to the slide in the same direction as the slide moves in traveling from retracted to extended position, said actuator means being provided with cam-forming means inclined with respect to the direction f movement of the actuator means and being operatively engaged with the -cushion frame so that as the yactuator means moves to and fro translationally relative to the slide the cushion frame will be shifted correspondingly up-and-down, and driving means for propelling the actuator means to-an-d-fro.

6. An obstetrical table comprising a bed sec tion, a slide shiftably mounted beneath the bed section for movement in 'a substantially horizontal direction from retracted position in which it is disposed beneath the bed section to extended position in which it projects outwardly from one transverse end of the bed section, said slide having spaced parallel side members, substantially vertical guides carried by the side members, a cushion frame carried by the slide land engaged within the guides so as to be capable of substantially horizontal movement with the slide a-nd also up-and-down movement relative to the slide, actuator means .carried by the slide and shiftably connected thereto for limited translational movement relative to the slide in the same direction as the slide moves in traveling from retracted to extended position, said actuator means being provided with ycam-forming means inclined with respect to the direction of movement of the actuator means and being operatively engaged with the cushion frame so that as the actuator means moves to and fro translationally relative to the slide the cushion frame will be shifted correspondingly up-and-down, and an end plate disposed transversely and closurewise across the louter end of the slide, said Plate being resiliently held in place so as to yield outwardly as the cushion frame is raised in the event that an unauthorized object is accidentally interposed therebetween.

HYMAN ROBERT *SHAB/IPAINE.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 328,460 Clark Oct. 20, 1885 '2,021,107 Logie Nov. 12, 1935 2,120,732 IComper et al June 14, 1938 2,257,491 Armstrong Sept. 30, 1941 `2,306,031 Anderson et al Dec. 22, 1942

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