CA1236446A - Device for raising and lowering objects, such as bed frames, work tables or the like - Google Patents
Device for raising and lowering objects, such as bed frames, work tables or the likeInfo
- Publication number
- CA1236446A CA1236446A CA000472240A CA472240A CA1236446A CA 1236446 A CA1236446 A CA 1236446A CA 000472240 A CA000472240 A CA 000472240A CA 472240 A CA472240 A CA 472240A CA 1236446 A CA1236446 A CA 1236446A
- Authority
- CA
- Canada
- Prior art keywords
- arm
- stand
- upwardly
- power mechanism
- wedge
- 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
Abstract
Abstract A device for raising and lowering objects which includes a stand (1), an arm (5) pivotably supported on the stand for carrying a bed frame or the like, a power mechanism (8) for pivoting the arm (5) and a wedge (12) which is insertable between portions of the stand and arm in order to actuate these portions away from each other and thereby pivot the arm upwardly from the stand. The wedge (12) is movable perpendicularly to the pivot axis (6) of the arm (5) and is connected to a dog (18) adapted to abut a component (28) connected to the arm (5) after a certain initial introduction of the wedge between said portions (9, 10). (Fig 3).
Description
3~
A device for raising and lowerin~ objects, such as bed frames, work tables or the like FIELD OF INVENTION AND PRIOR ART
This invention relates to a device for raising and lowering a support device such as a bed frame, work table or the like.
.
Similar supporting devices are known Eor example as disclosed in FR-A 1 560 817. In this device, the element producing the wedge action is formed by a slide, which is guidedly movable in a horizontal path. The element has the character of a long beam, at the outer end of which the wedge portion is arranged. ~hen the wedge portlon, which apart from the contact with the support arm is freely located, urges the support arm to pivot upwardly, the element is ~xposed to a downwardly directed force giving rise to a torque, which may cause jamming with regard to the guiding of the element relative to the stand since this guide has to maintain the element in the hori20ntal path of movement and prevent pivoting downwardly of the wedge portion. Furthermore, a hinge between the wedge element and the power mechanism is, in the device according to the patent, located above the area of contact between the dog and the support arm or the part connected thereto, which on displacement of the element in order to pivot the support arm upwardly, gives rise to a torque on the element tending to pivot its wedge portion downwardly, which causes additional risk of jamming and lose of energy.
BRIEF DISCLOS~RE OF THE INVENTION
An object of the invention is to devise a way for reducing the deficiencies discussed hereinabove.
This object is primarily obtained by a device for raising and lowering objects, such as bed frames, ~ , ~
~L2~
work tables or the like, comprising a stand, at least one arm pivotably carried by the stand, said arm being adapted to support the object in question, a power m~chanism for pivotlng the support arm, and an element connected to the rnechanism, said element being, by means of said mechanism, displaceable generally perpendicularly to the pivot axis of the support arm and designed to provide, in cooperation with a portion of the support arm, a wedge action tending to pivot said portion and thereby the support arm upwardly from the base, said mechanism and element being connected to a dog, which is adapted to, starting from a maximally downwardly pivoted position of the support arm, engage the support arm or a part connected thereto after an initial displace-ment of the element and associated initial pivoting upwardly of the support arm and apply power developed by said mechanism on the support arm or the part connected there-to for the remaining pivotin~ upwardly of the support arm, characterized in that a portion of the element which provides -the wedge action is vertically movable and introducable between said portion of the support arm and a portion of the stand located therebelow so as to move said portions away from each other by wedging contact therewith.
In this way, an embodiment is obtained, in which the forces acting on the wedge portion of the element in a direction downwardly during lifting of the support arm are balanced by means of the portion of the stand located therebelow so that the guide problems occurring in the French patent discussed pre-viousl~ are eliminated. ~rhis is in particular due to the fact that the mobility of the wedge portion in a vertical sense eliminates such breaking stresses which may occur in the device according to the patent by those guides which serve to maintain the element in its horisontal path of movement. Moreover, the design accor-ding to the invention makes it possible to obtain, by location of the hinge between the wedge element and the power mechanism below the area of contact of the dog, such actuation of the wedge portion that it will move upwardly during pivoting upwardly of the arm. Thus, the wedge element will urge the arm upwardly also when the proper wedge action has been terminated, i.e. when the 15 ; wedge portion has entered out of contact with the stand.
SHORT DESC~IPTION O~ THE DRAW:CNGS
The invention is illustratcd by way of example in the accompanying drawings wherein:
In tha drawings:
fig 1 is a side view of a device constructed in accordance with the present invention with th~ support arm lowered;
fig 2 is a plan view of fig 1;
fig 3 is a view illustrating the support arm somewhat pivoted upwardly; and fig 4 is a view illustrating the support art fully pivoted upwardly.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
The device illustrated in the drawings for raising and lowering objects comprises a stand 1 having two longitu-dinal beams 2 and cross beams 3 arranged at the ends of beams 2. Legs 4 are provided at the outer ends of the cross beams. A support arm 5 is pivotably journalled to the stand about a generally horisontal axis 6. The object to be handled, such as a bed frame, a work table or the like may be attached in a manner known per se at the upper end of support arm S and the cross piece 7 provided thereon. A power mechanism 8 is adapted to pivot arm S. The mechanism is constituted by a piston cylinder mechanism.
The mechanism 8 is connected to an element 11 which is introducable between portions 9 and lO of the stand 1 and support arm S respectively said element producing, in cooperation with said portions 9 10 a wedge action tending to pivot the arm upwardly from the stand.
The element 11 is displaceable generally perpendicularly to the pivot axis 6 of arm 5 and has a wedge shaped for-ward portion 12. This portion has two surfaces 13 and 14 diverging from the tip of the wedge and adapted to contact portions 9 and lO respectively.
A second arm 15 is connected to arm S via an ~xis 16 parallel to axis 6. The arm 15 has a portion 17 protru-ding from the axis 16 the end o~ said portion being attached to a cross member 28, the opposite ends of which are received in separated guides~on the inner sides of the longitudinal beams 2 in such a manner that cross member ~ is displaceable reciprocatingly in the guides and also rotatable about an axis parallel to the pivot axis 6 of arm 5.
The mechanism 8 and elemen-t 11 are associated to a dog 18, which is adapted to, after displacement o~ the wedge portion 12 of the element in a certain degree into a position between portions 9 and 10, abut cross member 28 in order to apply the force developed by the mechanism thereon. The dog 18 is formed by a downwardly directed projection on the element. This projection is connected to wedge portion 12 by means of an intermediàte portion extending at an angle to the projection.
~:3~
Preferably, the arms 5 and 15 are coordinated with the axis 16 between the ends of the arms like a pair of scissors so that also arm 15 with a cross piece 20 located at the end opposite to the cross member 28 may take part in supporting the object in question. On the cross member 28, guide surfaces 21 may be provided, bet-ween which portion ~of element 11 is movable.
The dog 18 is rigidly associated to the connecting por-tion 19, which in turn is rigidly connected to wedge portion 12. However, the mechanism 8 is hingedly connec-ted (hinge 22) to the outer end of projection 18. The hinge 22 is located below that location where the projection 18 is adapted to contact cross member 28 so that a tendency to pivoting upwardly of wedge portion 12 is obtained on expansion of mechanism 8.
The portions on which the wedge sur~aces 13 and 1~ actuate are eormed by a statior1ary portion on the stand and a portion located in the area oE the hinge 16 between arms 5 and 15. The portion ~ is formed by means of a cross piece 23 extending between the longitudinal beams 2.
The cross piece 23 may be provided with a roller to reduce friction relative to wedge surface 13. Another roller 24 may be journalled about axis 16 between arms 5 and 15, said roller being intended for contact with wedge surface 14 and forming said contact portion 10. ~s appears from figs 1 and 2, arms 5 and 15 are parallell to the upper surface of the stand when the device is folded. Further, it appears from fig 1 that the wedge portion 12, when element 11 is maximally retracted by mechanism 8, has its tip retained between the portions or rollers 9and 10.
The device operates as follows: If it is desired -to raise an object carried on the cross pieces 7 and 20 starting from the position according to fig 1, the mechanism 8 is supplied with pressure fluid so as to be extended.
This causes wedge portion 12 to be introduced between portions 9 and 10 and separate them as illustrated in fig 3. Since the pivot axis 6 of arm 5 in this case is stationary relative to the stand, the cross member 28 is displaced in guides l9. ~y the design of wedge portion 12, a comparatively small amount of power of mechanism 8 is required to obtain initial pivoting upwardly of arms 5 and 15. After some additional e~pansion of mechanism 8, dog 18 will hit on cross member 28 so that power from mechanism 8 now is applied on said cross member. During continued extension of mechanism 8, the arms are pivo-ted relative to each other to the position according 10 to fig 4. The forward wedge portion 12 of element 11 is maintained pivoted upwardly and in contact with roller 24 by the torque exerted on the element due to the location of hinge 22 below the contact area between dog 18 and cross rnember 28.
lS Modifications of the device are of course possible within the scope of the invention.
~ '.
A device for raising and lowerin~ objects, such as bed frames, work tables or the like FIELD OF INVENTION AND PRIOR ART
This invention relates to a device for raising and lowering a support device such as a bed frame, work table or the like.
.
Similar supporting devices are known Eor example as disclosed in FR-A 1 560 817. In this device, the element producing the wedge action is formed by a slide, which is guidedly movable in a horizontal path. The element has the character of a long beam, at the outer end of which the wedge portion is arranged. ~hen the wedge portlon, which apart from the contact with the support arm is freely located, urges the support arm to pivot upwardly, the element is ~xposed to a downwardly directed force giving rise to a torque, which may cause jamming with regard to the guiding of the element relative to the stand since this guide has to maintain the element in the hori20ntal path of movement and prevent pivoting downwardly of the wedge portion. Furthermore, a hinge between the wedge element and the power mechanism is, in the device according to the patent, located above the area of contact between the dog and the support arm or the part connected thereto, which on displacement of the element in order to pivot the support arm upwardly, gives rise to a torque on the element tending to pivot its wedge portion downwardly, which causes additional risk of jamming and lose of energy.
BRIEF DISCLOS~RE OF THE INVENTION
An object of the invention is to devise a way for reducing the deficiencies discussed hereinabove.
This object is primarily obtained by a device for raising and lowering objects, such as bed frames, ~ , ~
~L2~
work tables or the like, comprising a stand, at least one arm pivotably carried by the stand, said arm being adapted to support the object in question, a power m~chanism for pivotlng the support arm, and an element connected to the rnechanism, said element being, by means of said mechanism, displaceable generally perpendicularly to the pivot axis of the support arm and designed to provide, in cooperation with a portion of the support arm, a wedge action tending to pivot said portion and thereby the support arm upwardly from the base, said mechanism and element being connected to a dog, which is adapted to, starting from a maximally downwardly pivoted position of the support arm, engage the support arm or a part connected thereto after an initial displace-ment of the element and associated initial pivoting upwardly of the support arm and apply power developed by said mechanism on the support arm or the part connected there-to for the remaining pivotin~ upwardly of the support arm, characterized in that a portion of the element which provides -the wedge action is vertically movable and introducable between said portion of the support arm and a portion of the stand located therebelow so as to move said portions away from each other by wedging contact therewith.
In this way, an embodiment is obtained, in which the forces acting on the wedge portion of the element in a direction downwardly during lifting of the support arm are balanced by means of the portion of the stand located therebelow so that the guide problems occurring in the French patent discussed pre-viousl~ are eliminated. ~rhis is in particular due to the fact that the mobility of the wedge portion in a vertical sense eliminates such breaking stresses which may occur in the device according to the patent by those guides which serve to maintain the element in its horisontal path of movement. Moreover, the design accor-ding to the invention makes it possible to obtain, by location of the hinge between the wedge element and the power mechanism below the area of contact of the dog, such actuation of the wedge portion that it will move upwardly during pivoting upwardly of the arm. Thus, the wedge element will urge the arm upwardly also when the proper wedge action has been terminated, i.e. when the 15 ; wedge portion has entered out of contact with the stand.
SHORT DESC~IPTION O~ THE DRAW:CNGS
The invention is illustratcd by way of example in the accompanying drawings wherein:
In tha drawings:
fig 1 is a side view of a device constructed in accordance with the present invention with th~ support arm lowered;
fig 2 is a plan view of fig 1;
fig 3 is a view illustrating the support arm somewhat pivoted upwardly; and fig 4 is a view illustrating the support art fully pivoted upwardly.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
The device illustrated in the drawings for raising and lowering objects comprises a stand 1 having two longitu-dinal beams 2 and cross beams 3 arranged at the ends of beams 2. Legs 4 are provided at the outer ends of the cross beams. A support arm 5 is pivotably journalled to the stand about a generally horisontal axis 6. The object to be handled, such as a bed frame, a work table or the like may be attached in a manner known per se at the upper end of support arm S and the cross piece 7 provided thereon. A power mechanism 8 is adapted to pivot arm S. The mechanism is constituted by a piston cylinder mechanism.
The mechanism 8 is connected to an element 11 which is introducable between portions 9 and lO of the stand 1 and support arm S respectively said element producing, in cooperation with said portions 9 10 a wedge action tending to pivot the arm upwardly from the stand.
The element 11 is displaceable generally perpendicularly to the pivot axis 6 of arm 5 and has a wedge shaped for-ward portion 12. This portion has two surfaces 13 and 14 diverging from the tip of the wedge and adapted to contact portions 9 and lO respectively.
A second arm 15 is connected to arm S via an ~xis 16 parallel to axis 6. The arm 15 has a portion 17 protru-ding from the axis 16 the end o~ said portion being attached to a cross member 28, the opposite ends of which are received in separated guides~on the inner sides of the longitudinal beams 2 in such a manner that cross member ~ is displaceable reciprocatingly in the guides and also rotatable about an axis parallel to the pivot axis 6 of arm 5.
The mechanism 8 and elemen-t 11 are associated to a dog 18, which is adapted to, after displacement o~ the wedge portion 12 of the element in a certain degree into a position between portions 9 and 10, abut cross member 28 in order to apply the force developed by the mechanism thereon. The dog 18 is formed by a downwardly directed projection on the element. This projection is connected to wedge portion 12 by means of an intermediàte portion extending at an angle to the projection.
~:3~
Preferably, the arms 5 and 15 are coordinated with the axis 16 between the ends of the arms like a pair of scissors so that also arm 15 with a cross piece 20 located at the end opposite to the cross member 28 may take part in supporting the object in question. On the cross member 28, guide surfaces 21 may be provided, bet-ween which portion ~of element 11 is movable.
The dog 18 is rigidly associated to the connecting por-tion 19, which in turn is rigidly connected to wedge portion 12. However, the mechanism 8 is hingedly connec-ted (hinge 22) to the outer end of projection 18. The hinge 22 is located below that location where the projection 18 is adapted to contact cross member 28 so that a tendency to pivoting upwardly of wedge portion 12 is obtained on expansion of mechanism 8.
The portions on which the wedge sur~aces 13 and 1~ actuate are eormed by a statior1ary portion on the stand and a portion located in the area oE the hinge 16 between arms 5 and 15. The portion ~ is formed by means of a cross piece 23 extending between the longitudinal beams 2.
The cross piece 23 may be provided with a roller to reduce friction relative to wedge surface 13. Another roller 24 may be journalled about axis 16 between arms 5 and 15, said roller being intended for contact with wedge surface 14 and forming said contact portion 10. ~s appears from figs 1 and 2, arms 5 and 15 are parallell to the upper surface of the stand when the device is folded. Further, it appears from fig 1 that the wedge portion 12, when element 11 is maximally retracted by mechanism 8, has its tip retained between the portions or rollers 9and 10.
The device operates as follows: If it is desired -to raise an object carried on the cross pieces 7 and 20 starting from the position according to fig 1, the mechanism 8 is supplied with pressure fluid so as to be extended.
This causes wedge portion 12 to be introduced between portions 9 and 10 and separate them as illustrated in fig 3. Since the pivot axis 6 of arm 5 in this case is stationary relative to the stand, the cross member 28 is displaced in guides l9. ~y the design of wedge portion 12, a comparatively small amount of power of mechanism 8 is required to obtain initial pivoting upwardly of arms 5 and 15. After some additional e~pansion of mechanism 8, dog 18 will hit on cross member 28 so that power from mechanism 8 now is applied on said cross member. During continued extension of mechanism 8, the arms are pivo-ted relative to each other to the position according 10 to fig 4. The forward wedge portion 12 of element 11 is maintained pivoted upwardly and in contact with roller 24 by the torque exerted on the element due to the location of hinge 22 below the contact area between dog 18 and cross rnember 28.
lS Modifications of the device are of course possible within the scope of the invention.
~ '.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device for raising and lowering objects, such as bed frames and work tables, comprising:
a stand;
a first arm pivotable around a pivot axis carried by the stand and being adapted to support the object in question;
an extensible power mechanism fixed to said stand;
an element pivotally connected to the power mechanism by a hinge and being displaceable generally perpendicularly to the pivot axis of the first arm by extension of said power mechanism and having an end introducible between a portion of the first arm and a section of the stand located below said end of said element so as to move said arm and said stand away from each other by wedging contact therewith upon extension of said power mechanism, and thereby pivoting the first arm upwardly from the stand;
a second arm hingedly connected to the first arm and having an end portion facing away from said first arm for cooperation with a guide arranged in the stand, said guide extending perpendicularly to the pivot axis of the first arm, said second arm being displaceable and pivotable relative to said guide;
and a dog integrally connected to the element and, starting from a maximally downwardly pivoted position of the first arm, engaging the end portion of the second arm after an initial displacement of the element and after associated initial upward pivoting of the first arm;
said hinge between the element and the power mechanism being disposed below the end portion of the second arm such that the dog pivots about said end portion of said second arm to move the end of said element upwardly upon continued extension of the mechanism so as to further pivot said first arm upwardly after termination of said wedging contact.
a stand;
a first arm pivotable around a pivot axis carried by the stand and being adapted to support the object in question;
an extensible power mechanism fixed to said stand;
an element pivotally connected to the power mechanism by a hinge and being displaceable generally perpendicularly to the pivot axis of the first arm by extension of said power mechanism and having an end introducible between a portion of the first arm and a section of the stand located below said end of said element so as to move said arm and said stand away from each other by wedging contact therewith upon extension of said power mechanism, and thereby pivoting the first arm upwardly from the stand;
a second arm hingedly connected to the first arm and having an end portion facing away from said first arm for cooperation with a guide arranged in the stand, said guide extending perpendicularly to the pivot axis of the first arm, said second arm being displaceable and pivotable relative to said guide;
and a dog integrally connected to the element and, starting from a maximally downwardly pivoted position of the first arm, engaging the end portion of the second arm after an initial displacement of the element and after associated initial upward pivoting of the first arm;
said hinge between the element and the power mechanism being disposed below the end portion of the second arm such that the dog pivots about said end portion of said second arm to move the end of said element upwardly upon continued extension of the mechanism so as to further pivot said first arm upwardly after termination of said wedging contact.
2. A device according to Claim 1, said portion of the first arm being formed by a roller arranged about a pin shaft forming the hinge between the arms, characterized in that the section of the stand is formed by a second roller.
3. A device according to Claim l, characterized in that the end of the element has its outer extremity retained between said portion of the first arm and said section of the stand when said arm is maximally pivoted downwardly towards the stand and the element is maximally retracted.
4. A device according to Claim 1, said element having a generally horizontal extent in its maximally retracted position and the end of the element having an upper upwardly sloping wedge surface, characterized in that the end of the element in the retracted position of the element has a downwardly sloping second wedge surface for co-operation with said section of the stand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000472240A CA1236446A (en) | 1985-01-16 | 1985-01-16 | Device for raising and lowering objects, such as bed frames, work tables or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000472240A CA1236446A (en) | 1985-01-16 | 1985-01-16 | Device for raising and lowering objects, such as bed frames, work tables or the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1236446A true CA1236446A (en) | 1988-05-10 |
Family
ID=4129589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000472240A Expired CA1236446A (en) | 1985-01-16 | 1985-01-16 | Device for raising and lowering objects, such as bed frames, work tables or the like |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1236446A (en) |
-
1985
- 1985-01-16 CA CA000472240A patent/CA1236446A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |