US3797052A - Trendelenberg mechanism - Google Patents
Trendelenberg mechanism Download PDFInfo
- Publication number
- US3797052A US3797052A US00231916A US3797052DA US3797052A US 3797052 A US3797052 A US 3797052A US 00231916 A US00231916 A US 00231916A US 3797052D A US3797052D A US 3797052DA US 3797052 A US3797052 A US 3797052A
- Authority
- US
- United States
- Prior art keywords
- bed
- cable
- crosshead
- draw bar
- clutch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
- A61G7/002—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame
- A61G7/005—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame tiltable around transverse horizontal axis, e.g. for Trendelenburg position
Definitions
- the object of the invention is to provide in a cable operated elevating mechanism an inexpensive Trendelenberg adjustment by means of which the cables attached to the four-telescopic legs of the bed may be operated in unison to cause the bed to ascend or descend uniformly, or may be operated selectively in pairs to achieve the head-down, Trendelenberg or shock position, or conversely, the head-up, reverse Trendelenberg, or drainage position of the patient.
- a further object of the invention is to provide a simple mechanical device for securing the disconnected cable hauling mechanism associated with the one bed end in the fully retracted position, i.e., with the associated bed end fully raised, to insure against inadvertent dropping of the raised bed end.
- a still further object of the invention is to provide a simple unitary. control mechanism effective by the same control movement to disconnect the drive unit from the aforementioned one bed end at either the fully raised or fully lowered positions of the bed.
- FIG. 1 is a series of four cartoons showing the bed in side elevation in its fully lowered, fully raised, headdown or Trendelenberg, and head-up or reverse Trendelenberg positions;
- FIG. 2 is a partial assembly view of the cableoperated elevating mechanism with the portions of the bed not essential to the elevating mechanismv broken away to facilitate the orientation of certain details within the overall assembly;
- FIG. 3 is a fragmentary plan view of the cable hauling mechanism, particularly of the mechanism for disconnecting one pair of cables from the drive unit and for their retention at the position corresponding to the fully-raised position of their associated bed end;
- FIG. 4 is a fragmentary side elevation corresponding to FIG. 3, also partially broken away to emphasize certain details
- FIG. 5 is a fragmentary end elevation of the control mechanism for the selective disconnection of the aforementioned disconnectable cables
- FIG. 6 is a fragmentary enlargement of the cable disconnecting mechanism shown at the left-hand end of FIG. 3;
- FIG. 7 is a corresponding side elevation of the same, showing the two positions of the control mechanism by means of which the aforementioned disconnectable pair of cables is separated from the drive unit.
- FIG. 2 A quick summary of the mechanism and its operation may be had from FIG. 2, which reveals that the drive unit comprises a screw 10 aligned with the longitudinal center line of the bed, and engaged in a nut 12 at one end of a long draw bar assembly 14 axially aligned with the screw.
- the head end of the bed is at the left of FIG. 2, and the foot end at the right.
- the drive screw is located at the foot end of the bed so that the motor and switch gear (not shown), if the bed be electrically operated, are remote from the area of oxygen administration, and so that the screw may be conveniently turned by a crank at the foot of the bed, if operated manually.
- the draw bar assembly 14 comprises a pair of paral-.
- lel metal straps 16 secured in flanking relation to the drive nut 12 at one end, and at their other to a cross head 18 to which the cables 20 associated with the foot end of the bed are attached.
- the draw bar assembly 14 continues toward the head of the bed as a single rod 22 of solid circular cross section anchored in the crosshead 18 that draws the foot end cables, and passing freely through a second crosshead 24 attached to the head end cables 26.
- the draw bar 22 passes through a ball clutch 28, the housing of which abuts the back side of the cross head 24.
- a controlrod 30 at the foot end of the bed when pulled upwardly by a knob 32 at its upper end, is effective through a bell crank 34 to draw a longitudinal pull rod 36 toward the foot of the bed.
- the extreme opposite or headward end of the rod 36 is curled about the operating collar of the ball clutch 28, and when so moved when the bed is in the fully lowered position illustrated in FIG. 2, serves to disconnect the ball clutch 28 from the draw bar 22 and to permit the draw bar 22 to pass freely through the head end cross head 24 leaving it behind, i.e., with the cables 26 of the head end fuly extended and thus with the telescoped legs at the head end of the bed fully retracted.
- the bed may be fully elevated to position b of FIG. 1.
- a double hook 38 pivoted on the bed frame, is positioned to grasp the sideward guiding extensions of the head end cable crosshead 24.
- the power unit is operated, therefore, to send the draw bar assembly 14 back toward the head of the bed, i.e., to lower the bed, the'head end crosshead 24 is securely retained in the hook 38 to retain the head end of the bed in the nearly fully raised position while the foot end descends. If descending motion is continued to its limit, the bed achieves position d of FIG. 1.
- FIG. 2 The structural underframing of the bed is suggested rather than fully illustrated in FIG. 2, but may be readily visualized from the illustration,.together with the cartoons of FIG. 1, as comprising a pair of facing channel rails 40 extending longitudinally of the bed and spaced apart a distance considerably less than the overall width of the bed. These side rails 40 are joined intermediate their ends by a pair of cross rails 42 and 44, also of channel shape, and are connected at their ends to the cross rails of the end frames 46 by means of suitable reinforcing gusset plates 48.
- Each end frame comprises a pair of opposed corner posts 50 connected by the cross rail 46, of some depth, to which the longitudinal side rails of the underframe are secured, and as indicated in FIGS. 1 and 2, each corner post 50 houses a telescoped retractable leg 52.
- the bed is raised by extending the retractable legs 52 from the corner posts, and this in turn is accomplished by the elevating cables 20 and 26, the far end of each of which is staked by means of a swaged, offset fitting in a hole in the wall of the extensible leg 52, which is preferably tubular.
- each elevating cable 26 that is housed within a corner post 50 passes downwardly between the outside of the retractable leg and the inside of the hollow corner post, passes around a sheave 54 and is directed to one of a pair of sheaves S6 in the cross rail of the end frame, from whence the cable 26 proceeds to its connection with the cable hauling crosshead 24.
- the cables 20 for the foot end of the bed are rigged in much the same manner, except that the pair of sheaves 58 at which the cables depart the foot end of the bed are spread farther apart so as to flank the driving motor and transmission, not shown.
- the foot end cables extend toward the head of the bed passing through holes provided in the cross member 44, and thence about the sheaves 60 in the other cross member 42, reversing their direction to then extend toward the foot of the bed, and being anchored in the fixed crosshead 18 of the draw bar assembly.
- the foot end cables likewise pass through clearance holes in the head end crosshead 24, which may be disengaged from the draw bar assembly 14 for the execution of the Trendelenberg position, as earlier explained.
- the spaced parallel straps 16 I which at one end flank the nut 12 engaged with the drive screw 10 extend through a clearance hole in the web of the cross member 44 of the'underframe', and are welded at their opposite ends to a bar of square cross section which serves as the cross head 18 for the foot end elevating cables 20.
- the crosshead 18 is drilled and tapped (FIG.
- the cable crosshead 24 is not fixed in the draw bar assembly 14 but rather that the circular rodportion 22 of the assembly passes freely through the crosshead 24, a clearance hole 62 being provided for that purpose. Flanking the central clearance hole for the draw bar rod 22 are the cable anchores 64 for the head end cables, and flanking them in turn in the cross bar are two additional clearance holes 66 to permit the foot end cables 20 also to pass freely through the crosshead. In its intermediate or midportion the cross head 24 is of square cross section,
- the projecting outer portions 68 of the crosshead 24 pass outwardly through guide slots 72 which are formed in the webs of a pair of facing channel members 74 and serve as ways for the crosshead 24.
- the channels 74 extend longitudinally between the two cross members 42 and 44 of the underframe of the bed, and serve as a housing and support for the cable hauling mechanism.
- the ball clutch- 28 can be operated to disengage itself from the rod portion 22 of the draw bar assembly 14 to permit the draw-bar assembly to move freely toward the foot end ofv the bed, i.e., without hauling upon the head end cable crosshead 24.
- the latter in that instance maintains its fully lowered position determined by the abutment of its outwardly extending portions 68 with the webs of the facing channel rails at the mounting bracket 78 which extends upwardly from the cross member.
- These holes provide slide bearings for the rod 30 and may, if desired, be provided with bushings of nylon or the like.
- the bell crank 34 is pivoted on a pin 80 passing between the upstanding legs of the U-shaped bracket 78.
- the bell crank 34 passes through a slot 82 milled in the vertical rod to which it is pivotally connected by means of a pin 84 passing through and anchored in the vertical rod 30 and seated in a short slot 86 in the bell crank.
- the other arm of the bell crank is pivotally connected by means of a clevis 88 to the longitudinally extending rod 36 which extends toward the head end of the bed.
- the long pull rod 36 is bent into a hook 90 (FIGS. 4 and 7) curled about and seated within a circumferential groove 92 in the ball clutch actuator 94 through which the rod portion 22 of the draw bar passes.
- the actuator 94 is cup-shaped on its side facing the clutch proper, and the cup partially houses a spring 96 which encircles the draw bar rod 22 between the actuator 94 and the clutch proper.
- the ball clutch proper comprises an inner sleeve 98 having a free slip fit on the draw bar rod 22, which passes through it.
- the sleeve is provided with a plurality of radial holes, all in the same plane and each forming a cage for a steel bearing ball 100 which provides the locking detent for the clutch.
- the rod portion 22 of the draw bar is suitably necked down to provide a seat 102 in which to receive the detent balls in locking engagement, the seat being chamfered at both sides to cam the balls radially outwardly to disconnect the rod 22 from the inner sleeve 98 when outward movement of the detent balls 100 is permitted.
- an outer sleeve or cage 104 Surrounding the inner sleeve 98 is an outer sleeve or cage 104 which has a slip fit with the inner sleeve 98 upon which it is mounted.
- the interior of the outer sleeve is machined out from one end to provide concentric cylindrical recesses 106 and 108 of different diameters, the lesser 106 serving to confine the detent balls 100 in the necked down portion 102 of the draw bar rod 22, and the greater 108 movable into alignment with the detent balls by the endwise movement of the clutch actuator 94, as illustrated in FIG. 7, to permit the detent balls 100 to move outwardly, and thus to release the draw bar rod 22 when the latter is drawn toward the foot of the bed.
- the detent balls 100 urged by the camming engagement of the step between the concentric cylindrical recesses 106 and 108 of the outer sleeve 104,are returned into locking engagement with the necked down portion 102 of the draw bar rod 22 as the compressed clutch spring 112 returns the outer sleeve 104 to its retaining position.
- the clutch assembly 28 moves slightly to the left as the ball clutch re-engages the rod 22, thus to provide the necessary clearance for the disengaging movement.
- the arrangement is such, therefore, as to require manual lifting of the control knob 30 to disconnect the head end crosshead 24 from the draw bar 22 but to per mit the same to reconnect itself automatically when the draw bar 22 returns to the fully lowered position.
- both crossheads 24 and 18 move simultaneously if there has been no manipulation of the Trendelenberg control at the extreme low position.
- the ball clutch actuator 94 is ineffective to disengage the ball clutch, which, by the movement of the draw bar assembly to the right, or footward, has moved out of the sphere of operation of the clutch actuator, the inner sleeve 98 of the clutch pushing the cross head 24 before it.
- the bed may be placed in the reverse Trendelenberg or drainage position shown in position d of FIG. 1.
- the facing channel rails 74 which house the cable hauling mechanism are straddled by the double book 38, which comprises a pair of upwardly open hooks l 14 united as an integral assembly by an upper cross bar 116 which passes over the top of the long control rod 36.
- the double hook is pivoted on a pintle 118 which passes through aligned holes in the hook portions 114 and in the facing channel rails 74, and is maintained in assembly therewith by a cotter key which prevents its withdrawal.
- the connecting cross bar 116 that units the two hook portions 114 is notched, as shown particularly in FIGS. 2 and 3 to form a seat for an upstanding stud 120 mounted on the longcontrol rod 36.
- the stud is drilled diametrically to receive the control rod 36, and drilled and tapped axially to take a set screw by means of which the stud is adjustably positioned on the rod.
- the double hook 38 is normally urged to the solid position of FIG. 4 by a torsion spring 122 surrounding the pivot pintle 118 and having one of its ends seated in a hole in the adjacent channel web and the other bearing upon the double hook assembly.
- the guide slots 72 in the webs of the facing channels 74, through which the outwardly projecting ends 68 of the head end cable crosshead 24 project, are sufficiently long, as is the normal elevation stroke of the draw bar assembly 14, to bring the outwardly projecting ends of the crosshead 24 into the operating zone of the hooks 114.
- the double hook 38 having been moved by the stud 120 to the intercepting broken line position of FIG. 4, serves as a detent to retain the head end cable cross head 24 at the fully raised position while the draw bar assembly, including the ball clutch 28 returns to the fully lowered position, thus placing the bed into the attitude illustrated in position d of FIG.
- the flat 70 is milled in the upper left-hand quarter of each end as viewed in FIG. 4 to provide an unstable center point of contact between the hook point and the crosshead such that the crosshead 24 either seats itself firmly within the hook, or it forces the hook 38 (and the Trendelenberg control knob 30) downwardly.
- This precaution prevents accidental dropping of the head end of the bed by either assuring firm engagement with the hook or immediate notification of the attendant of his abortive effort, and in any event, the safe operation of the bed.
- the double hook assembly 38 is likewise self-resetting when the cable hauling mechanism is again returned to the position at which the cable crosshead 24 was disconnected from the draw bar assembly. Specifically, upon return movement of the draw bar assembly 14 to the fully raised position, bringing with it the ball clutch 28, the inner sleeve 98 of the ball clutch re-engages the back edge of the head end cable crosshead 24, moving it slightly to the right from the broken line position in FIG. 4, and freeing the ends 68 of the crosshead 24 from their seating engagement within the hook. With the cross head thus moved slightly toward the foot of the bed from the broken line position shown in FIG. 4, the double hook is returned to its depending full line position of FIG. 4 by the action of the return spring 122. The head end cable crosshead 24 thus remains supported by the ball clutch 28 for its return to the fully lowered position, absent further operation of the Trendelenberg control.
- a Trendelenberg adjustment which comprises the connection of said cables to said cable hauling mechanism by separate pairs respectively associated with opposite ends of the bed, the connection of one of said cable pairs being disengageable from the cable-hauling mechanism at either the retracted or the extended positions of the bed legs associated therewith, thereby to tilt the bed longitudinally by subsequent extension or retraction respectively of the legs associated with the other cable pair, and means on the bed frame for carrying the load on said one cable pair when disengaged from said cablehauling mechanism.
- the cablehauling mechanism comprises a screw-actuated draw bar
- the disengageable cable pair is secured to a crosshead movable by said draw bar in ways on said bed frame
- said load carrying means includes the engagement of said crosshead with the bed frame at the one end of said ways corresponding to the retracted position of the associated bed legs, and detent means on said bed frame selectively engageable with said crosshead at the other end of said ways to maintain the extended position of said associated bed legs when the draw bar is actuated to permit the retraction of the legs associated with the other cable pair
- the disengageable connection of the draw bar and crosshead is a clutch normally engaged to transmit the cable load on said crosshead to said draw bar when said bed is elevated.
- the draw bar comprises in part a rod passing freely through said crosshead and having thereon a ball clutch positioned to engage the crosshead on one side thereof to transmit the cable load to the draw bar
- said detent means comprises a normally disengaged hook member movable on said bed frame to engage said crosshead to retain said disengageable cable pair in full legextending position when the draw bar is subsequently moved to permit the retraction of the legs associated with the other cable pair.
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- Health & Medical Sciences (AREA)
- Rehabilitation Therapy (AREA)
- Nursing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Invalid Beds And Related Equipment (AREA)
Abstract
Description
Claims (5)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US23191672A | 1972-03-06 | 1972-03-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3797052A true US3797052A (en) | 1974-03-19 |
Family
ID=22871137
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00231916A Expired - Lifetime US3797052A (en) | 1972-03-06 | 1972-03-06 | Trendelenberg mechanism |
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Country | Link |
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US (1) | US3797052A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4057240A (en) * | 1975-09-02 | 1977-11-08 | Joerns Furniture Company | Examination table |
US4325561A (en) * | 1980-03-17 | 1982-04-20 | Lynn Gary S | Nesting patient transport tables |
WO1983003394A1 (en) * | 1982-03-31 | 1983-10-13 | Lynn, Gary, S. | Nesting patient transport tables |
US4787104A (en) * | 1984-10-18 | 1988-11-29 | Grantham Frederick W | Convertible hospital bed |
DE9104892U1 (en) * | 1991-04-22 | 1991-07-25 | Kötter, Helmut, 4901 Hiddenhausen | Hospital or nursing bed |
US5317769A (en) * | 1992-11-10 | 1994-06-07 | Hill-Rom Company, Inc. | Hospital bed |
US5720059A (en) * | 1995-09-13 | 1998-02-24 | M.C. Healthcare Products Inc. | Tilting mechanism for bed |
US6772462B1 (en) | 2003-06-10 | 2004-08-10 | Claflin Enterprises, Llc | Tiltable bed |
US10051970B1 (en) * | 2017-09-20 | 2018-08-21 | Dreamwell, Ltd. | Adjustable support legs for a mattress foundation |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3132351A (en) * | 1961-10-17 | 1964-05-12 | William Freeman J | Hospital bed |
US3206771A (en) * | 1964-09-09 | 1965-09-21 | American Seating Co | Adjustment mechanism for hospital bed |
US3217339A (en) * | 1963-03-04 | 1965-11-16 | American Seating Co | Hospital bed |
-
1972
- 1972-03-06 US US00231916A patent/US3797052A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3132351A (en) * | 1961-10-17 | 1964-05-12 | William Freeman J | Hospital bed |
US3217339A (en) * | 1963-03-04 | 1965-11-16 | American Seating Co | Hospital bed |
US3206771A (en) * | 1964-09-09 | 1965-09-21 | American Seating Co | Adjustment mechanism for hospital bed |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4057240A (en) * | 1975-09-02 | 1977-11-08 | Joerns Furniture Company | Examination table |
US4325561A (en) * | 1980-03-17 | 1982-04-20 | Lynn Gary S | Nesting patient transport tables |
WO1983003394A1 (en) * | 1982-03-31 | 1983-10-13 | Lynn, Gary, S. | Nesting patient transport tables |
US4787104A (en) * | 1984-10-18 | 1988-11-29 | Grantham Frederick W | Convertible hospital bed |
DE9104892U1 (en) * | 1991-04-22 | 1991-07-25 | Kötter, Helmut, 4901 Hiddenhausen | Hospital or nursing bed |
US5317769A (en) * | 1992-11-10 | 1994-06-07 | Hill-Rom Company, Inc. | Hospital bed |
US5720059A (en) * | 1995-09-13 | 1998-02-24 | M.C. Healthcare Products Inc. | Tilting mechanism for bed |
US6772462B1 (en) | 2003-06-10 | 2004-08-10 | Claflin Enterprises, Llc | Tiltable bed |
US10051970B1 (en) * | 2017-09-20 | 2018-08-21 | Dreamwell, Ltd. | Adjustable support legs for a mattress foundation |
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AS | Assignment |
Owner name: SIMMONS U.S.A. CORPORATION, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SIMMONS COMPANY;REEL/FRAME:003864/0343 Effective date: 19810619 Owner name: SIMMONS U.S.A. CORPORATION, 1 GULF + WESTERN PLAZA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SIMMONS COMPANY;REEL/FRAME:003864/0343 Effective date: 19810619 |
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Owner name: SIMMONS HEALTHCARE, INC., NORTH CAROLINA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SIMMONS UNIVERSAL CORPORATION, A CORP. OF DE.;REEL/FRAME:004746/0792 Effective date: 19870820 Owner name: SIMMONS HEALTHCARE, INC., 11900 STEELE CREEK ROAD, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SIMMONS UNIVERSAL CORPORATION, A CORP. OF DE.;REEL/FRAME:004746/0792 Effective date: 19870820 |
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