CA1151355A - Driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on - Google Patents
Driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting onInfo
- Publication number
- CA1151355A CA1151355A CA000369436A CA369436A CA1151355A CA 1151355 A CA1151355 A CA 1151355A CA 000369436 A CA000369436 A CA 000369436A CA 369436 A CA369436 A CA 369436A CA 1151355 A CA1151355 A CA 1151355A
- Authority
- CA
- Canada
- Prior art keywords
- driving
- working rod
- piece
- locking
- platform
- 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
Links
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
- A61G7/012—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame raising or lowering of the whole mattress frame
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C20/00—Head -, foot -, or like rests for beds, sofas or the like
- A47C20/04—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination
- A47C20/041—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination by electric motors
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C20/00—Head -, foot -, or like rests for beds, sofas or the like
- A47C20/04—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination
- A47C20/047—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination by friction locking means
Landscapes
- Health & Medical Sciences (AREA)
- Nursing (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Invalid Beds And Related Equipment (AREA)
Abstract
ABSTRACT
A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, comprising a support cylinder containing a working rod extensibly, being provided, at one end, with a driving section and a locking section of said working rod, said working rod, having a driving piece loosely fitted movably in said driving section, a driving shaft, being provided close to one side of said driving piece, a driving protrusion for pushing said driving piece at said one side against the resilience of a return spring, being formed on said driving shaft, to move said driving piece forward by said driving pro-trusion and backward by said return spring, and to drive said working rod by the forward movement of said driving piece, and said working rod, having a locking piece fitted loosely, held at one side to move pivotally, and having a locking spring in said locking section, so that when said driving piece is moved back-ward by said return spring, said locking piece may be kept inclined by the resilience of said locking spring, to lock said working rod, is connected with a lifting member for lifting and lowering the platform of bed or any other thing for sleeping or resting on, by converting the displacement applied to the lifting member itself, to make a lifting device of said platform, and said driv-ing shaft is rotated in alternate directions by a lever, to move said working rod in one direction gradually, for raising said platform.
A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, comprising a support cylinder containing a working rod extensibly, being provided, at one end, with a driving section and a locking section of said working rod, said working rod, having a driving piece loosely fitted movably in said driving section, a driving shaft, being provided close to one side of said driving piece, a driving protrusion for pushing said driving piece at said one side against the resilience of a return spring, being formed on said driving shaft, to move said driving piece forward by said driving pro-trusion and backward by said return spring, and to drive said working rod by the forward movement of said driving piece, and said working rod, having a locking piece fitted loosely, held at one side to move pivotally, and having a locking spring in said locking section, so that when said driving piece is moved back-ward by said return spring, said locking piece may be kept inclined by the resilience of said locking spring, to lock said working rod, is connected with a lifting member for lifting and lowering the platform of bed or any other thing for sleeping or resting on, by converting the displacement applied to the lifting member itself, to make a lifting device of said platform, and said driv-ing shaft is rotated in alternate directions by a lever, to move said working rod in one direction gradually, for raising said platform.
Description
~513S5 DRIVING DEVICE FOR LIFTING AND LOWERING THE PLATFORM OF
A BED OR ANY OTHER THING FOR SLEEPING OR RESTING ON
BACKGROUND OF TEIE INVENTION
The presen-t invention relates to a new driving device for lifting and lowering the platform of a bed or any other thing for a patient, etc. to sleep on, be examined, be treated, or be carried on.
We have now various structures for lifting and lowering the platform of a bed for a patient, etc. to sleep or rest on, for example, a structure in which the platform is divided into plural portions, to lift desired portions of the platform pivot-ally in desired directions, making the platform undulate as a whole; a structure in which the bedstead supporting the platform is lifted, to lift said platform as a whole; and a sturcture in which said bedstead is lifted at either side of the head or feet of the patient or is lifted on one side and lowered on the other side, to lift said platform only on one side, making said platform incline as a whole. With such a bed, a lifting mechanism is installed at a proper position below said platform, and it com-prises a iifting member to convert the displacement applied to it for lifting said platform or bedstead, and a drivlng device for applying such displacement to said lifting member.
A conventional typical driving device for applying displacement to said lifting member is shown, for example in USP.
Nos. 3,015,113 and 3,174,161. In this device, the internal thread provided at one end of a hollow working rod is engaged with the external thread of a rotatable shaft, and the external thread shaft is rotated by a crank handle, or geared motor, etc., to displace the working rod linearly~ Although such a device is widely used, it has a disadvantage that the friction between the ~L5135S
internal thread and the external thread requires a considerable burden on manpower operation, and that if the frictional force is going to be decreased to reduce the burden, the cost must be raised. Also when said external thread shaft is rotated by a geared motor, the cost will be raised needless to say. In addi-tion to such a device, there is a pneumatic or hydraulic cylinder device used as said driving device. However, the device requires an air compressor or hydraulic pump as the pressure source, and furthermore various valves such as a pressure reducing valve, pressure regulating valve and control valve. The device as a whole with l:hese and piping included reauires a large space, and makes the cost high, further being involved in the problems of noise generation and maintenance very disadvantageously.
SUMMARY OF THE INVENTION
The driving device of the present invention does not use such an expensive drive source as said geared motor, air compressor or hydraulic pump, but allows manpower driving, thereby allowing the required space to be reduced for effective utilization of the space below the bed, etc. and low cost to be attained. F~rthermore, the driving device of the present inven-tion keeps the influence of frictional force very small compared with said device using internal thread and an external thread shaft, to decrease the burden of manpower driving. For driving, since a lever, etc. is reciprocated, the operation can be made not only by a hand, but also by a foot. Therefore, the operation mechanism allows optimum design, depending on various conditions such as the structure of the bed, etc.
The present invention is described in detail below, in reference to preferable embodiments.
~1355 BRIEF DESCRIPTION OF T~E DRAWINGS
Figs. lA and lB show the driving device of -the present invention schematically, and lA is an illustrative front view partially cut away to show the inside as a section, while lB is a plan view.
Fig. 2 is an enlarged illustrative longitudinal section to show the structure and action of an important portion as a first embodiment of the driving device of the present invention.
Figs. 3A and 3B are enlarged illustrative longitudinal sections to show the structure and action of an important portion as a second embodiment of the driving device of the present invention.
Figs. 4A and 4B are enlarged illustrative longitudinal sections to show the structure and action of an important portion as a third embodiment of the driving device of the present invention.
Figs. 5A and 5B are respectively an enlarged illustra-tive plan view and an enlarged illustrative longitudinal section of an important portion, to show the action of the leaf spring in the third embodiment of the driving device of the present invention shown in Figs. 4A and 4B.
Figs. 6A and 6B and Fig. 7 are illustrative front views to show embodiments with the driving device of the present invention applied to a bed.
Figs. 8A and 8B are respectively an illustrative per-spective view and an illustrative longitudinal section to show the structure and action of an embodiment of the lever means used in the driving device of the present invention.
Fig. 9 is an illustrative front view to show the state of using the lever means shown in Figs. 8A and 8B, with the driving device of the present invention applied to a bed.
~5~355 DETAILED DESCRIPTION OF THE INVENTION
In the drawings, symbol 1 indicates a support cylinder containing a working rod 2 extensibly, and said support cylinder has, at one end, a driving section A and a locking section B of said working rod 2. In said driving section A, said working rod
A BED OR ANY OTHER THING FOR SLEEPING OR RESTING ON
BACKGROUND OF TEIE INVENTION
The presen-t invention relates to a new driving device for lifting and lowering the platform of a bed or any other thing for a patient, etc. to sleep on, be examined, be treated, or be carried on.
We have now various structures for lifting and lowering the platform of a bed for a patient, etc. to sleep or rest on, for example, a structure in which the platform is divided into plural portions, to lift desired portions of the platform pivot-ally in desired directions, making the platform undulate as a whole; a structure in which the bedstead supporting the platform is lifted, to lift said platform as a whole; and a sturcture in which said bedstead is lifted at either side of the head or feet of the patient or is lifted on one side and lowered on the other side, to lift said platform only on one side, making said platform incline as a whole. With such a bed, a lifting mechanism is installed at a proper position below said platform, and it com-prises a iifting member to convert the displacement applied to it for lifting said platform or bedstead, and a drivlng device for applying such displacement to said lifting member.
A conventional typical driving device for applying displacement to said lifting member is shown, for example in USP.
Nos. 3,015,113 and 3,174,161. In this device, the internal thread provided at one end of a hollow working rod is engaged with the external thread of a rotatable shaft, and the external thread shaft is rotated by a crank handle, or geared motor, etc., to displace the working rod linearly~ Although such a device is widely used, it has a disadvantage that the friction between the ~L5135S
internal thread and the external thread requires a considerable burden on manpower operation, and that if the frictional force is going to be decreased to reduce the burden, the cost must be raised. Also when said external thread shaft is rotated by a geared motor, the cost will be raised needless to say. In addi-tion to such a device, there is a pneumatic or hydraulic cylinder device used as said driving device. However, the device requires an air compressor or hydraulic pump as the pressure source, and furthermore various valves such as a pressure reducing valve, pressure regulating valve and control valve. The device as a whole with l:hese and piping included reauires a large space, and makes the cost high, further being involved in the problems of noise generation and maintenance very disadvantageously.
SUMMARY OF THE INVENTION
The driving device of the present invention does not use such an expensive drive source as said geared motor, air compressor or hydraulic pump, but allows manpower driving, thereby allowing the required space to be reduced for effective utilization of the space below the bed, etc. and low cost to be attained. F~rthermore, the driving device of the present inven-tion keeps the influence of frictional force very small compared with said device using internal thread and an external thread shaft, to decrease the burden of manpower driving. For driving, since a lever, etc. is reciprocated, the operation can be made not only by a hand, but also by a foot. Therefore, the operation mechanism allows optimum design, depending on various conditions such as the structure of the bed, etc.
The present invention is described in detail below, in reference to preferable embodiments.
~1355 BRIEF DESCRIPTION OF T~E DRAWINGS
Figs. lA and lB show the driving device of -the present invention schematically, and lA is an illustrative front view partially cut away to show the inside as a section, while lB is a plan view.
Fig. 2 is an enlarged illustrative longitudinal section to show the structure and action of an important portion as a first embodiment of the driving device of the present invention.
Figs. 3A and 3B are enlarged illustrative longitudinal sections to show the structure and action of an important portion as a second embodiment of the driving device of the present invention.
Figs. 4A and 4B are enlarged illustrative longitudinal sections to show the structure and action of an important portion as a third embodiment of the driving device of the present invention.
Figs. 5A and 5B are respectively an enlarged illustra-tive plan view and an enlarged illustrative longitudinal section of an important portion, to show the action of the leaf spring in the third embodiment of the driving device of the present invention shown in Figs. 4A and 4B.
Figs. 6A and 6B and Fig. 7 are illustrative front views to show embodiments with the driving device of the present invention applied to a bed.
Figs. 8A and 8B are respectively an illustrative per-spective view and an illustrative longitudinal section to show the structure and action of an embodiment of the lever means used in the driving device of the present invention.
Fig. 9 is an illustrative front view to show the state of using the lever means shown in Figs. 8A and 8B, with the driving device of the present invention applied to a bed.
~5~355 DETAILED DESCRIPTION OF THE INVENTION
In the drawings, symbol 1 indicates a support cylinder containing a working rod 2 extensibly, and said support cylinder has, at one end, a driving section A and a locking section B of said working rod 2. In said driving section A, said working rod
2 has a driving piece 3 loosely fitted movably, and a driving shaft 4 is provided near to one side of said driving piece 3.
On said driving shaft 4, a driving protrusion 6 is formed, to push said driving piece 3 at its one side a against the resilience of a return spring 5, so that said driving piece 3 may be moved forward by said driving protrusion 6 and backward by said return spring 5. In said locking section B, said working rod 2 has a locking piece 7 loosely fitted pivotally movably with one side held, and a locking spring 8 is provided, so that when said driving piece 3 is moved backward by the return spring 5, said locking piece 7 may be kept inclined by the resilience of the locking spring 8, to lock said working rod 2. The locking piece 7 can be supported by a groove 9 as shown in Fig. 2 or by a pro-trusion 9' as shown in Fig. 3, or by a hinge though not illustrated.
In the state shown by solid lines in Fig. 2, if the driving shaft 4 is rotated clockwise in the drawing by a proper mechanism as described later, the driving protrusion 6 formed on the driving shaft 4 pushes said driving piece 3 at its one side against the resilience of the return spring 5. Since the driving piece 3 is pushed only at one side in this way, to move leftward in the drawing in its inclined state, it locks the working rod 2 according to the principle of so-called inclination lock, to move said working rod 2 leftward in the drawing, extending said working rod 2 from the suppor-t cylinder 1. In this case, the locking piece 7 is inclined by the resilience of the locking spring 8, being in contact with the working rod 2, but since the ~15:~355 working rod 2 moves in the direction (leftward in the drawing) to erect the inclined locking piece 7, the working rod 2 is not locked by the locking piece 7, not causing the movement to be prevented. After the driving piece 3 is moved forward to the end of movement in this way, the driving shaft 4 is rotated in the other direction, to move the driving protrusion 6 back, and this causes the driving piece 3 to ~e moved back to the starting point of forward movement by the resilience of the return spring 5. In this case, since the driving piece 3 is supported at one side by the driving protrusion 6 which is being moved back, it inclines in the same direction as in case of moving forward, by the resilience of the return spring 5. However, since said driving protrusion 6 is moved back in the direction to erect the inclined driving piece 3, said driving piece 3 is not locked by the working rod 2, not being prevented from moving backward. In this case, though said locking piece 7 does not lock said working rod 2 in the direction in which the working rod 2 is moved by the forward movement of the driving piece 3 as mentioned before, it locks the working rod 2 in the other direction according to the principle of inclination lock, to prevent the movement in such direction. Thus, in the forward movement of the driving piece 3, the working rod 2 is moved forward, and in the backward movement, the working rod 2 is prevented from returning by the locking piece 7. Therefore, by repeating the forward and back-ward movement of said driving piece 3, the working rod 2 can be driven in one direction intermittently against the load, to be gradually extended from the support cylinder 1. To shorten the working rod 2 extended from the support cylinder 1 in this way, the locking piece 7 can be pivotally moved against the resilience of the locking spring 8 by a proper mechanism, to be erected, releasing the lock between the locking piece 7 and the working rod 2. ~hus, the working rod 2 can be moved in the load direction, ~iL5135S
to be shortened into the support cylinder.
Embodiments of the mechanism for pivotally moving said locking piece 7 against the resilience of the locking spring 8 are described below.
In the first embodiment shown in Fig. 2, the locking piece 7 is pulled at the other side, by a tension wire means W, to be pivotally moved. This composition has a feature that said locking piece 7 can be pivotally moved independently of said driving shaft 6.
On the contrary, in the second embodiment shown in Figs.
3A and 3B and in the third embodiment shown in Figs. 4A and 4B, said locking piece 7 is pivotally moved in relation with said driving shaft 4. The structure and action are as described below.
In Figs. 3A and 3B, Figs 4A and 4B and Figs. 5A and 5B, symbol 10 indicates a releasing bar provided in the rear of said driving protrusion 6 and in front of said locking piece 7. Said releasing bar 10 is moved toward said locking piece 7, by moving said driving protrusion 6 backward beyond the position correspond-ing to the start point of the forward movement of said driving piece 3.
In this composition, if the working rod 2 is driven by the action mentioned before, the driving protrusion 6 is stopped at a position before it pushes the releasing bar 10 when the driving piece 3 iS moved backward, in order that the locking piece 7 may not be pivotally rotated to be erect by said releas-ing bar 10.
If said driving shaft 4 is rotated to move the driving protrusion 6 further backward beyond said stop position reached during driving, said driving protrusion 6 contacts, at its rear side, the releasing bar 10, to move it. Therefore, the locking piece 7 is pivotally moved to be erect by said releasing bar 10 against the resilience of the locking spring 8, to unlock the ~15~L355i working rod 2. Thus, in this state, t~le working rod 2 can be moved in the direction reverse to the driving drirection, and moves in the load direction as illustrated, being shortened illtO the support cylinder 1.
As described above, when the working rod 2 is driven, the drivlng protrusion 6 is s-topped at a position bcfore it pushes the releasing bar 10, and when the working rod 2 is moved backward, it is moved further backward beyond said stop position. For such operation, for example, a proper stopper can be provided in cor-respondence to the stop position, so that during driving, said stopper is actuated, to prevent the backward movement, and for returning of the working rod 2, said stopper is released, to allow the backward movement. As another composition, d load by the resilience of a spring can be applied for the backward move-ment beyond said stop position, so that the driving protrusion 6 may be stopped at said stop position by said load during driv-ing, and may be moved further backward by a force larger than said load, during returning. Any other composition can be easily adopted for such operation.
A preferable embodiment of the latter composition in which said operation can be made by the resilience of a spring is shown in Figs. 4A and 4B and Figs. 5A and 5B. In the drawings, symbol 11 indicates an arcuately curved leaf spring provided between the tip of said releasing bar 10 and said locking piece 7, with its convex side turned toward said releasing bar 10.
The leaf spring ll is set as described above, for example, being fitted into fitting grooves 12 formed on the side wall of the casing of the locking section B as illustrated.
In this composition, as mentioned before, for driving the working rod 2, when the driving piece 3 is moved backward, the driving protrusion 6 pushes said releasing bar 10, and must be stopped before the position where the locking piece 7 is ~15~3SS
actuated, so that the locking piece 7 may not be pivotally rotated to be erected by said releasing bar 10. In this embodiment, since the arcuately curved leaf spring 11 is provided between the tip of the releasing bar 10 and the locking piece 7, with the convex side turned toward the releasing bar 10, said leaf spring 11 generates a large repulsive force when the releasing bar 10 is moved toward the locking piece 7, and the repulsive force can easily and reliably stop the driving protrusion 6, preventing false operation.
When the driving shaft 4 is rotated, the driving pro-trusion 6 can be moved backward beyond the stop position reached during driving, to move the releasing bar 10 toward the locking piece 7 against the repulsive force of the leaf spring 11. If the releasing bar 10 pushes the locking piece 7 through the leaf spring 11, to pivotally rotate the locking piece 7 against the resilience of the locking spring 8, the inclined locking piece 7 is erected, unlocking the working rod 2. Therefore as mentioned above, in this state, the working rod 2 can move in the direction reverse to the driving direction, to be shortened into the support cylinder 1. In this case, since the leaf spring 11 is curved arcuately as illustrated, to be convex toward the tip of the releasing bar, said repulsive force is very large at the beginning, but when the convex portion in contact with the tip of the re-leasing bar 10 becomes flat with the movement of the releasing bar 10 as illustrated, the repulsive force becomes very small, allowing sudden bending by said releasing bar 10. Such sudden change of status is transmitted to the hand or foot of the operator through a lever 13 described later. Therefore, if such sudden change of status is made to correspond to the completed erect action of the locking piece 7, the operator can confirm whether the locking by the locking piece 7 is released, by a reaction to him during operation. Thus, the unlocking can be ~15~3S5 effected definitely, and t~le working rod 2 can be moved backward smoothly.
In this composition, when used for a becl 14 or any other thing for sleeping or resting on, the driving device of the present invention is connected to a ~ifting ~ember for lifting and lowering the platform 15 or bedstead ',6 of t-he ~ed, to make a lifting mechanism of the platform ]5. Embodimcrl~ are described below. Fig. 6 shows an example, in which the roc)t of the support cylinder 1 is fitted to a bedstead 16, and the tip of the working rod 2 is connected to a lifting member 18 provided be]ow a movable platform portion 17, whereby said driving piece 3 is reciprocated, to extend the working rod 2 from the support cylinder 1, raising the movable platform portion 17 pivotally by the lifting member 18 against gravity. In this example, the driving shaft 4 reci-procating the driving piece 3 can be driven by a lever 13 directly fitted to the driving shaft 6 as shown in 6A, or the lever 13 can be connected to the driving shaft 4 through a proper motion transmitting mechanism M such as a link work, with said lever 13 set at a proper position below the ~ed 14 as shown in 6B. Fig. 7 shows another example, in which the bedstead 16 and a base 19 are connected by parallel links 20, to allow said bedstead 16 to be lifted and lowered in parallel, and a crank arm 21 like a bell crank is connected to one of said parallel links 20, with the tip of the working rod 2 connected to said crank arm 21, and the root of the support cylinder 1 connected to the base 19. In this example, the lever 13 provided at a proper position as described in the previous example is locked, to extend the working rod 2 from the support cylinder 1 to raise the bedstead 16 in parallel against gravity. The style and mechanism for lifting the plat-form 15 can be composed by any other way. If the platform 15 is lifted in this way, the load is applied through the ]ifting mechanism to the working rod 2, acting to shorten said working ~15~35~
rod 2 into the support cylind~r 1. EIowever, the workincJ rod 2 is locked by the locking piece 7 acc5rdil-~ to the principle of in-clination lock, to prevent the working rod 2 from being shortened, thereby supporting said load. And by rotating the lever 13, as mentioned above, the locking piece 7 is pivota]ly rotated to be erected against the resilience of the locking sprincl 8, alLowing the working rod 2 to be shortened into the support cylinder 1, and in this state, the platform 15 can be lowered.
When the driving device of the present invention is used to make a lifting mechanism of the platform 15 as mentioned above, a buffer spring means D for energizing said platform 15 in the direction reverse to the action of gravity is installed to prevent the sudden drop of the platform 15 by the load. ~s far as buffer spring means D provides a force of energizing the platform 15 in the direction reverse ~o the action of gravity, the structure and place of installation can be freely selected.
A preferable embodiment of the buffer spring means D is illus-strated.
In this embodiment, the buffer spring means D is con-nected in the support cylinder 1 between the support cylinder 1 and the working rod 2, to energize the working rod 2 in the direction for the working rod 2 to be moved by the driving of said driving piece 3. If the buffer spring means D is contained in the driving device in this way, the lifting mechanism as a whole can be simplified.
The buffer spring means D described above can be a general spring means such as coil spring, but if a spring means using the compressive elasticity of a gas, viz. a spring means known as gas spring is used as illustrated, said energizing force can be adjusted easily, and a desired energizing force can be given by a small-sized means as a feature of the gas spring.
5 15:3L35S
A.-; c~escribed above, since the driving device of the present inverltion reasonably use~ the princip]e of inclination lock, the drivin(l shaft 4 can be rot~lted in a]ternate directions to repeat the reciprocation of -the driving piece 3, movin~l the working rod 2 in olle direction graclually agdinst the load.
Therefore, it has a large feature that said driving shaft 4 can be rotated n~ only by a lever operated by a l~land, but .llso by a foot lever.
Figs. 8A and 8B show a preferable embodiment of the lever means used for the driviny device of the present invention different from that shown in Figs. 6A and 6B and Fig. 7. 'i`he structure and action are as described below. In the drawings, symbol 22 is a rotating shaft made of a pipe, etc, and at one side of the rotating shaft 22, a guide cylinder 23 is provided, with a lever 24 slidably fitted in said guide cylinder 23. Said guide cylinder 23 has a stopper 27 which brings a stopper pin 25 into resilient contact with said lever 24 by a spring 26. Said lever 24 is provided with dents 28 which can be engaged with the tip of said stopper pin 25. In the drawing, there are two dents 28 above and below but only one dent can be provided below, or more than two dents can be prGvided. In the drawing, there is a slope 29 on one side of each dent 28, and this is provided to enable the dent 28 to be disengaged from said tip of the stopper pin 25, by simply moving the lever 24 at more than a predetermined force. But the slope 29 can be of course provided on the tip of the stopper pin 25. Symbol 9 is a properly shaped grip.
In this composition, the lever means of the embodiment is connected, through its rotating shaft 22, with the driving shaft 4 of the driving device of -the present invention, being installed at a side of the platform 15 of the bed 14, etc. For use, the lever 24 can be operated with a low force, by engaging said stopper pin 25 resiliently with said dent 28 which makes ~1513SS
the distance between the grip 30 arLd the ro~ati-ncJ shaft 22 the longest. In this pOSition, not onl,~ a nurse, etc. but also a patient can operate the lever means. Since the lever 24 is fixed with the stopper pin 25 resilier~tly engaged wlth the lever 24, it is kept fixed unless a force of more t~lan that predetermined by the resilience of the spring 26 is applied in the axial direct;on of the lever 24. Furthermore it is free from loosenin-~ and play, and also in this regard, it does not adversely affect the opera-tion at all.
When a patient on the bed 14 gets off from the platLoYm 15, or when a serious patient is moved from the bed 14 to any other place, or when a nurse, etc. arranges the bed 14, the lever positioned above a side of the bed 14 is disturbing. In this case, if a force of more than that predetermined by the resilience, etc. of said spring 26 is applied in the axial direction of the lever 24, -the stopper pin 25 is disengaged from the dent 28 along the slope 29, and the lever 24 can be simply shortened as illus-trated, to put the grip 30 below the platform. Therefore, the grip 30 is not disturbing at all even in the above mentioned case.
As described in detail above, in the present invention, for the forward movement of the driving piece 3, the working rod 2 is moved against the load of the platform 15, and for the back-ward movement of the driving piece 3, the locking piece 7 prevents the return of the working rod 2 by the load. In other words, the working rod 2 can be moved against the load intermittently and gradually in one direction by the rotation of the driving shaft 4 in alternate directions for repeating the reciprocation of the driving piece 3, by reasonable use of the principle of inclination lock. In the above description, the working rod is arranged to be moved, being driven by the driving piece 3, in the direction of extending from the support cylinder 1, but on the contrary, ~513SS
the working rod 2 carl be of course arranged to be driven ~y the driving piece 3 .in the direction of shorteni-ng into the suppor-t cylinder l. The drivi.ng devic~ of tlle present inventi.nn has the following various fe~ltures, w~ n dpp1:ied to the 1ifting mech~nism of the platform of a bed, for exampl.e. (1) Since the stlucture is very simple ancl is not 1.arge-scal~d, the liftilg mechanism of the platform can be made very simple. (2) Compared with the driving device with internal thread engaged wi.th external thL-ead, the loss of manpower by frictional force is small, makirlg the burden of manpower small. (3) Since the working rod 2 can be moved in one directi.on against the load by -the rotation of the driving shaft 4 in alternate directions, the operation of the lever for rotating the driving shaft 4 is simple. And for example, a foot lever can be used as the lever, and in this case, the burden of manpower for lifting the platform can be reduced further.
(4) If the buffer spring means D in the direction for the working rod 2 to resile against the load is connected between the working rod 2 and the support cylinder l, to be contained in the driving device of the present invention, the sudden return of the working rod 2 by the load can be prevented, and therefore the sudden drop of the platform can be prevented without installing such a buffer spring means D or any other buffer means in any other portion of the lifting mechanism of the platform, enabling the entire structure of the lifting mechanism to be very simplified. (5) Since precision working of internal thread, external thread, etc.
is not required, manufacture is easy, and the device can be supplied at low cost. (6) Since the device allows manpower driving without using an expensive driving source such as a geared motor, air compressor or hydraulic pump, the space below the bed, etc. can be used effectively, and the device can be supplied at very low cost also in connection with the feature (5).
On said driving shaft 4, a driving protrusion 6 is formed, to push said driving piece 3 at its one side a against the resilience of a return spring 5, so that said driving piece 3 may be moved forward by said driving protrusion 6 and backward by said return spring 5. In said locking section B, said working rod 2 has a locking piece 7 loosely fitted pivotally movably with one side held, and a locking spring 8 is provided, so that when said driving piece 3 is moved backward by the return spring 5, said locking piece 7 may be kept inclined by the resilience of the locking spring 8, to lock said working rod 2. The locking piece 7 can be supported by a groove 9 as shown in Fig. 2 or by a pro-trusion 9' as shown in Fig. 3, or by a hinge though not illustrated.
In the state shown by solid lines in Fig. 2, if the driving shaft 4 is rotated clockwise in the drawing by a proper mechanism as described later, the driving protrusion 6 formed on the driving shaft 4 pushes said driving piece 3 at its one side against the resilience of the return spring 5. Since the driving piece 3 is pushed only at one side in this way, to move leftward in the drawing in its inclined state, it locks the working rod 2 according to the principle of so-called inclination lock, to move said working rod 2 leftward in the drawing, extending said working rod 2 from the suppor-t cylinder 1. In this case, the locking piece 7 is inclined by the resilience of the locking spring 8, being in contact with the working rod 2, but since the ~15:~355 working rod 2 moves in the direction (leftward in the drawing) to erect the inclined locking piece 7, the working rod 2 is not locked by the locking piece 7, not causing the movement to be prevented. After the driving piece 3 is moved forward to the end of movement in this way, the driving shaft 4 is rotated in the other direction, to move the driving protrusion 6 back, and this causes the driving piece 3 to ~e moved back to the starting point of forward movement by the resilience of the return spring 5. In this case, since the driving piece 3 is supported at one side by the driving protrusion 6 which is being moved back, it inclines in the same direction as in case of moving forward, by the resilience of the return spring 5. However, since said driving protrusion 6 is moved back in the direction to erect the inclined driving piece 3, said driving piece 3 is not locked by the working rod 2, not being prevented from moving backward. In this case, though said locking piece 7 does not lock said working rod 2 in the direction in which the working rod 2 is moved by the forward movement of the driving piece 3 as mentioned before, it locks the working rod 2 in the other direction according to the principle of inclination lock, to prevent the movement in such direction. Thus, in the forward movement of the driving piece 3, the working rod 2 is moved forward, and in the backward movement, the working rod 2 is prevented from returning by the locking piece 7. Therefore, by repeating the forward and back-ward movement of said driving piece 3, the working rod 2 can be driven in one direction intermittently against the load, to be gradually extended from the support cylinder 1. To shorten the working rod 2 extended from the support cylinder 1 in this way, the locking piece 7 can be pivotally moved against the resilience of the locking spring 8 by a proper mechanism, to be erected, releasing the lock between the locking piece 7 and the working rod 2. ~hus, the working rod 2 can be moved in the load direction, ~iL5135S
to be shortened into the support cylinder.
Embodiments of the mechanism for pivotally moving said locking piece 7 against the resilience of the locking spring 8 are described below.
In the first embodiment shown in Fig. 2, the locking piece 7 is pulled at the other side, by a tension wire means W, to be pivotally moved. This composition has a feature that said locking piece 7 can be pivotally moved independently of said driving shaft 6.
On the contrary, in the second embodiment shown in Figs.
3A and 3B and in the third embodiment shown in Figs. 4A and 4B, said locking piece 7 is pivotally moved in relation with said driving shaft 4. The structure and action are as described below.
In Figs. 3A and 3B, Figs 4A and 4B and Figs. 5A and 5B, symbol 10 indicates a releasing bar provided in the rear of said driving protrusion 6 and in front of said locking piece 7. Said releasing bar 10 is moved toward said locking piece 7, by moving said driving protrusion 6 backward beyond the position correspond-ing to the start point of the forward movement of said driving piece 3.
In this composition, if the working rod 2 is driven by the action mentioned before, the driving protrusion 6 is stopped at a position before it pushes the releasing bar 10 when the driving piece 3 iS moved backward, in order that the locking piece 7 may not be pivotally rotated to be erect by said releas-ing bar 10.
If said driving shaft 4 is rotated to move the driving protrusion 6 further backward beyond said stop position reached during driving, said driving protrusion 6 contacts, at its rear side, the releasing bar 10, to move it. Therefore, the locking piece 7 is pivotally moved to be erect by said releasing bar 10 against the resilience of the locking spring 8, to unlock the ~15~L355i working rod 2. Thus, in this state, t~le working rod 2 can be moved in the direction reverse to the driving drirection, and moves in the load direction as illustrated, being shortened illtO the support cylinder 1.
As described above, when the working rod 2 is driven, the drivlng protrusion 6 is s-topped at a position bcfore it pushes the releasing bar 10, and when the working rod 2 is moved backward, it is moved further backward beyond said stop position. For such operation, for example, a proper stopper can be provided in cor-respondence to the stop position, so that during driving, said stopper is actuated, to prevent the backward movement, and for returning of the working rod 2, said stopper is released, to allow the backward movement. As another composition, d load by the resilience of a spring can be applied for the backward move-ment beyond said stop position, so that the driving protrusion 6 may be stopped at said stop position by said load during driv-ing, and may be moved further backward by a force larger than said load, during returning. Any other composition can be easily adopted for such operation.
A preferable embodiment of the latter composition in which said operation can be made by the resilience of a spring is shown in Figs. 4A and 4B and Figs. 5A and 5B. In the drawings, symbol 11 indicates an arcuately curved leaf spring provided between the tip of said releasing bar 10 and said locking piece 7, with its convex side turned toward said releasing bar 10.
The leaf spring ll is set as described above, for example, being fitted into fitting grooves 12 formed on the side wall of the casing of the locking section B as illustrated.
In this composition, as mentioned before, for driving the working rod 2, when the driving piece 3 is moved backward, the driving protrusion 6 pushes said releasing bar 10, and must be stopped before the position where the locking piece 7 is ~15~3SS
actuated, so that the locking piece 7 may not be pivotally rotated to be erected by said releasing bar 10. In this embodiment, since the arcuately curved leaf spring 11 is provided between the tip of the releasing bar 10 and the locking piece 7, with the convex side turned toward the releasing bar 10, said leaf spring 11 generates a large repulsive force when the releasing bar 10 is moved toward the locking piece 7, and the repulsive force can easily and reliably stop the driving protrusion 6, preventing false operation.
When the driving shaft 4 is rotated, the driving pro-trusion 6 can be moved backward beyond the stop position reached during driving, to move the releasing bar 10 toward the locking piece 7 against the repulsive force of the leaf spring 11. If the releasing bar 10 pushes the locking piece 7 through the leaf spring 11, to pivotally rotate the locking piece 7 against the resilience of the locking spring 8, the inclined locking piece 7 is erected, unlocking the working rod 2. Therefore as mentioned above, in this state, the working rod 2 can move in the direction reverse to the driving direction, to be shortened into the support cylinder 1. In this case, since the leaf spring 11 is curved arcuately as illustrated, to be convex toward the tip of the releasing bar, said repulsive force is very large at the beginning, but when the convex portion in contact with the tip of the re-leasing bar 10 becomes flat with the movement of the releasing bar 10 as illustrated, the repulsive force becomes very small, allowing sudden bending by said releasing bar 10. Such sudden change of status is transmitted to the hand or foot of the operator through a lever 13 described later. Therefore, if such sudden change of status is made to correspond to the completed erect action of the locking piece 7, the operator can confirm whether the locking by the locking piece 7 is released, by a reaction to him during operation. Thus, the unlocking can be ~15~3S5 effected definitely, and t~le working rod 2 can be moved backward smoothly.
In this composition, when used for a becl 14 or any other thing for sleeping or resting on, the driving device of the present invention is connected to a ~ifting ~ember for lifting and lowering the platform 15 or bedstead ',6 of t-he ~ed, to make a lifting mechanism of the platform ]5. Embodimcrl~ are described below. Fig. 6 shows an example, in which the roc)t of the support cylinder 1 is fitted to a bedstead 16, and the tip of the working rod 2 is connected to a lifting member 18 provided be]ow a movable platform portion 17, whereby said driving piece 3 is reciprocated, to extend the working rod 2 from the support cylinder 1, raising the movable platform portion 17 pivotally by the lifting member 18 against gravity. In this example, the driving shaft 4 reci-procating the driving piece 3 can be driven by a lever 13 directly fitted to the driving shaft 6 as shown in 6A, or the lever 13 can be connected to the driving shaft 4 through a proper motion transmitting mechanism M such as a link work, with said lever 13 set at a proper position below the ~ed 14 as shown in 6B. Fig. 7 shows another example, in which the bedstead 16 and a base 19 are connected by parallel links 20, to allow said bedstead 16 to be lifted and lowered in parallel, and a crank arm 21 like a bell crank is connected to one of said parallel links 20, with the tip of the working rod 2 connected to said crank arm 21, and the root of the support cylinder 1 connected to the base 19. In this example, the lever 13 provided at a proper position as described in the previous example is locked, to extend the working rod 2 from the support cylinder 1 to raise the bedstead 16 in parallel against gravity. The style and mechanism for lifting the plat-form 15 can be composed by any other way. If the platform 15 is lifted in this way, the load is applied through the ]ifting mechanism to the working rod 2, acting to shorten said working ~15~35~
rod 2 into the support cylind~r 1. EIowever, the workincJ rod 2 is locked by the locking piece 7 acc5rdil-~ to the principle of in-clination lock, to prevent the working rod 2 from being shortened, thereby supporting said load. And by rotating the lever 13, as mentioned above, the locking piece 7 is pivota]ly rotated to be erected against the resilience of the locking sprincl 8, alLowing the working rod 2 to be shortened into the support cylinder 1, and in this state, the platform 15 can be lowered.
When the driving device of the present invention is used to make a lifting mechanism of the platform 15 as mentioned above, a buffer spring means D for energizing said platform 15 in the direction reverse to the action of gravity is installed to prevent the sudden drop of the platform 15 by the load. ~s far as buffer spring means D provides a force of energizing the platform 15 in the direction reverse ~o the action of gravity, the structure and place of installation can be freely selected.
A preferable embodiment of the buffer spring means D is illus-strated.
In this embodiment, the buffer spring means D is con-nected in the support cylinder 1 between the support cylinder 1 and the working rod 2, to energize the working rod 2 in the direction for the working rod 2 to be moved by the driving of said driving piece 3. If the buffer spring means D is contained in the driving device in this way, the lifting mechanism as a whole can be simplified.
The buffer spring means D described above can be a general spring means such as coil spring, but if a spring means using the compressive elasticity of a gas, viz. a spring means known as gas spring is used as illustrated, said energizing force can be adjusted easily, and a desired energizing force can be given by a small-sized means as a feature of the gas spring.
5 15:3L35S
A.-; c~escribed above, since the driving device of the present inverltion reasonably use~ the princip]e of inclination lock, the drivin(l shaft 4 can be rot~lted in a]ternate directions to repeat the reciprocation of -the driving piece 3, movin~l the working rod 2 in olle direction graclually agdinst the load.
Therefore, it has a large feature that said driving shaft 4 can be rotated n~ only by a lever operated by a l~land, but .llso by a foot lever.
Figs. 8A and 8B show a preferable embodiment of the lever means used for the driviny device of the present invention different from that shown in Figs. 6A and 6B and Fig. 7. 'i`he structure and action are as described below. In the drawings, symbol 22 is a rotating shaft made of a pipe, etc, and at one side of the rotating shaft 22, a guide cylinder 23 is provided, with a lever 24 slidably fitted in said guide cylinder 23. Said guide cylinder 23 has a stopper 27 which brings a stopper pin 25 into resilient contact with said lever 24 by a spring 26. Said lever 24 is provided with dents 28 which can be engaged with the tip of said stopper pin 25. In the drawing, there are two dents 28 above and below but only one dent can be provided below, or more than two dents can be prGvided. In the drawing, there is a slope 29 on one side of each dent 28, and this is provided to enable the dent 28 to be disengaged from said tip of the stopper pin 25, by simply moving the lever 24 at more than a predetermined force. But the slope 29 can be of course provided on the tip of the stopper pin 25. Symbol 9 is a properly shaped grip.
In this composition, the lever means of the embodiment is connected, through its rotating shaft 22, with the driving shaft 4 of the driving device of -the present invention, being installed at a side of the platform 15 of the bed 14, etc. For use, the lever 24 can be operated with a low force, by engaging said stopper pin 25 resiliently with said dent 28 which makes ~1513SS
the distance between the grip 30 arLd the ro~ati-ncJ shaft 22 the longest. In this pOSition, not onl,~ a nurse, etc. but also a patient can operate the lever means. Since the lever 24 is fixed with the stopper pin 25 resilier~tly engaged wlth the lever 24, it is kept fixed unless a force of more t~lan that predetermined by the resilience of the spring 26 is applied in the axial direct;on of the lever 24. Furthermore it is free from loosenin-~ and play, and also in this regard, it does not adversely affect the opera-tion at all.
When a patient on the bed 14 gets off from the platLoYm 15, or when a serious patient is moved from the bed 14 to any other place, or when a nurse, etc. arranges the bed 14, the lever positioned above a side of the bed 14 is disturbing. In this case, if a force of more than that predetermined by the resilience, etc. of said spring 26 is applied in the axial direction of the lever 24, -the stopper pin 25 is disengaged from the dent 28 along the slope 29, and the lever 24 can be simply shortened as illus-trated, to put the grip 30 below the platform. Therefore, the grip 30 is not disturbing at all even in the above mentioned case.
As described in detail above, in the present invention, for the forward movement of the driving piece 3, the working rod 2 is moved against the load of the platform 15, and for the back-ward movement of the driving piece 3, the locking piece 7 prevents the return of the working rod 2 by the load. In other words, the working rod 2 can be moved against the load intermittently and gradually in one direction by the rotation of the driving shaft 4 in alternate directions for repeating the reciprocation of the driving piece 3, by reasonable use of the principle of inclination lock. In the above description, the working rod is arranged to be moved, being driven by the driving piece 3, in the direction of extending from the support cylinder 1, but on the contrary, ~513SS
the working rod 2 carl be of course arranged to be driven ~y the driving piece 3 .in the direction of shorteni-ng into the suppor-t cylinder l. The drivi.ng devic~ of tlle present inventi.nn has the following various fe~ltures, w~ n dpp1:ied to the 1ifting mech~nism of the platform of a bed, for exampl.e. (1) Since the stlucture is very simple ancl is not 1.arge-scal~d, the liftilg mechanism of the platform can be made very simple. (2) Compared with the driving device with internal thread engaged wi.th external thL-ead, the loss of manpower by frictional force is small, makirlg the burden of manpower small. (3) Since the working rod 2 can be moved in one directi.on against the load by -the rotation of the driving shaft 4 in alternate directions, the operation of the lever for rotating the driving shaft 4 is simple. And for example, a foot lever can be used as the lever, and in this case, the burden of manpower for lifting the platform can be reduced further.
(4) If the buffer spring means D in the direction for the working rod 2 to resile against the load is connected between the working rod 2 and the support cylinder l, to be contained in the driving device of the present invention, the sudden return of the working rod 2 by the load can be prevented, and therefore the sudden drop of the platform can be prevented without installing such a buffer spring means D or any other buffer means in any other portion of the lifting mechanism of the platform, enabling the entire structure of the lifting mechanism to be very simplified. (5) Since precision working of internal thread, external thread, etc.
is not required, manufacture is easy, and the device can be supplied at low cost. (6) Since the device allows manpower driving without using an expensive driving source such as a geared motor, air compressor or hydraulic pump, the space below the bed, etc. can be used effectively, and the device can be supplied at very low cost also in connection with the feature (5).
Claims
(1) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, comprising a support cylinder containing a working rod extensibly, being provided, at one end with a driving section and a locking section of said working rod, said working rod, having a driving piece loosely fitted movably in said driving section, a driving shaft, being provided close to one side of said driving piece, a driving protrusion for pushing said driving piece at said one side against the resilience of a return spring, being formed on said driving shaft, to move said driving piece forward by said driving protrusion and backward by said return spring, and to drive said working rod by the forward movement of said driving piece, and said working rod, having a locking piece fitted loosely, held at one side to move pivotally, and having a locking spring in said locking section, so that when said driving piece is moved backward by said return spring, said locking piece may be kept inclined by the resilience of said locking spring, to lock said working rod.
(2) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, according to claim 1, wherein said locking piece is pivotally moved by a wire means against the resilience of the locking spring, to be erected from its inclined state.
(3) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, comprising a support cylinder containing a working rod extensibly, being provided, at one end, with a driving section and a locking section of said working rod, said working rod, having a driving piece loosely fitted movably in said driving section, a driving shaft, being provided close to one side of said driving piece, a driving protrusion for pushing said driving piece at said one side against the resilience of a return spring, being formed or.
said driving shaft, to move said driving piece forward by said driving protrusion and backward by said return spring, and to drive said working rod by the forward movement of said driving piece, said working rod, having a locking piece fitted loosely, held at one side to move pivotally, and having a locking spring in said locking section, so that when said driving piece is moved backward by said return spring, said locking piece may be kept inclined by the resilience of said locking spring, to lock said working rod. and a releasing bar, being provided movably in the rear of said driving protrusion and in front of said locking piece, so that said driving protrusion may be moved backward from the start point of the forward movement of said driving piece, to move said releasing bar, pivotally moving said locking piece against the resilience of said locking spring, to erect it, thereby unlocking said working rod.
(4) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, according to claim 3, wherein a curved leaf spring is provided between the tip of said releasing bar and said locking piece, with its convex side turned toward the releasing bar.
(5) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, according to claim 1, wherein said support cylinder contains a spring means energizing in the direction for said working rod to be driven by the driving piece, between said cylinder and said working rod.
(6) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, according to claim 5, wherein said spring means is a so-called gas spring using the compressive elasticity of a gas.
(7) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, according to claim 1 or 6, wherein a lever means which is com-posed of a rotating shaft, a guide cylinder provided at one side of said rotating shaft, a lever fitted slidably in said guide cylinder, a stopper provided on said guide cylinder, to bring a stopper pin into resilient contact with said lever by a spring, and dents provided on said lever, to allow engagement with said stopper pin, is fitted, with its rotating shaft connected to said driving shaft.
(2) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, according to claim 1, wherein said locking piece is pivotally moved by a wire means against the resilience of the locking spring, to be erected from its inclined state.
(3) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, comprising a support cylinder containing a working rod extensibly, being provided, at one end, with a driving section and a locking section of said working rod, said working rod, having a driving piece loosely fitted movably in said driving section, a driving shaft, being provided close to one side of said driving piece, a driving protrusion for pushing said driving piece at said one side against the resilience of a return spring, being formed or.
said driving shaft, to move said driving piece forward by said driving protrusion and backward by said return spring, and to drive said working rod by the forward movement of said driving piece, said working rod, having a locking piece fitted loosely, held at one side to move pivotally, and having a locking spring in said locking section, so that when said driving piece is moved backward by said return spring, said locking piece may be kept inclined by the resilience of said locking spring, to lock said working rod. and a releasing bar, being provided movably in the rear of said driving protrusion and in front of said locking piece, so that said driving protrusion may be moved backward from the start point of the forward movement of said driving piece, to move said releasing bar, pivotally moving said locking piece against the resilience of said locking spring, to erect it, thereby unlocking said working rod.
(4) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, according to claim 3, wherein a curved leaf spring is provided between the tip of said releasing bar and said locking piece, with its convex side turned toward the releasing bar.
(5) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, according to claim 1, wherein said support cylinder contains a spring means energizing in the direction for said working rod to be driven by the driving piece, between said cylinder and said working rod.
(6) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, according to claim 5, wherein said spring means is a so-called gas spring using the compressive elasticity of a gas.
(7) A driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on, according to claim 1 or 6, wherein a lever means which is com-posed of a rotating shaft, a guide cylinder provided at one side of said rotating shaft, a lever fitted slidably in said guide cylinder, a stopper provided on said guide cylinder, to bring a stopper pin into resilient contact with said lever by a spring, and dents provided on said lever, to allow engagement with said stopper pin, is fitted, with its rotating shaft connected to said driving shaft.
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1699180U JPS5810578Y2 (en) | 1980-02-13 | 1980-02-13 | Drive device for raising and lowering the floor |
| JP16442/1980 | 1980-02-13 | ||
| JP16991/1980 | 1980-02-13 | ||
| JP55016442A JPS5825463B2 (en) | 1980-02-13 | 1980-02-13 | Drive device for raising and lowering the floor |
| JP46180/1980 | 1980-04-05 | ||
| JP4618080U JPS5813853Y2 (en) | 1980-04-05 | 1980-04-05 | Handle device for floor lifting mechanism |
| JP146737/1980 | 1980-10-15 | ||
| JP14673780U JPS5810590Y2 (en) | 1980-10-15 | 1980-10-15 | Drive device for raising and lowering the floor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1151355A true CA1151355A (en) | 1983-08-09 |
Family
ID=27456578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000369436A Expired CA1151355A (en) | 1980-02-13 | 1981-01-27 | Driving device for lifting and lowering the platform of a bed or any other thing for sleeping or resting on |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1151355A (en) |
| DE (1) | DE3104484C2 (en) |
| FR (1) | FR2475381A1 (en) |
| GB (1) | GB2071611B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2182910A (en) * | 1985-10-11 | 1987-05-28 | Ellison Hospital Equipment Lim | Mechanical lifting device |
| US5337428A (en) * | 1992-10-15 | 1994-08-16 | Joerns Healthcare Inc. | Adjustable bed with mechanical jack |
| DE29811566U1 (en) * | 1998-06-29 | 1998-08-20 | Dewert Antriebs- und Systemtechnik GmbH & Co KG, 32278 Kirchlengern | Electromotive furniture drive |
| US9295598B2 (en) * | 2011-12-09 | 2016-03-29 | Stryker Corporation | Patient support backrest release and actuator assembly |
| CA2859085A1 (en) * | 2011-12-16 | 2013-06-20 | Chg Hospital Beds Inc. | Patient support overload or obstruction detection |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7219994U (en) * | 1972-08-17 | Bremshey Ag | Bed, especially sick bed | |
| US3015113A (en) * | 1955-12-02 | 1962-01-02 | Superior Sleeprite Corp | Adjustable bed |
| US3174161A (en) * | 1961-05-08 | 1965-03-23 | American Seating Co | Hospital bed |
| FR2171537A5 (en) * | 1972-02-04 | 1973-09-21 | Matifas Sa | |
| DE2411965A1 (en) * | 1974-03-13 | 1975-09-18 | Berg Fa Wilh | Hospital bed with height-adjustable mattress frame - has common control member for adjusting backrest and mattress |
-
1981
- 1981-01-27 CA CA000369436A patent/CA1151355A/en not_active Expired
- 1981-02-09 DE DE19813104484 patent/DE3104484C2/en not_active Expired
- 1981-02-12 FR FR8102772A patent/FR2475381A1/en active Granted
- 1981-02-13 GB GB8104555A patent/GB2071611B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2475381A1 (en) | 1981-08-14 |
| GB2071611A (en) | 1981-09-23 |
| GB2071611B (en) | 1984-04-26 |
| DE3104484C2 (en) | 1984-07-05 |
| FR2475381B1 (en) | 1984-01-13 |
| DE3104484A1 (en) | 1982-03-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |