ES2238944T3 - LADDER ELEVATOR FOR LADDER SLOTS WITH VARIABLE PENDING. - Google Patents

Abstract

A stairlift for variable-slope flight portions which comprises an upper guiding bar (2) and a lower guiding bar (3) which can be fixed to a fixed structure (5) and have a constant distance in a vertical direction. A movable frame (10) is slideable on the guiding bars (2,3) and supports an actuation motor (11). A main driving pinion (21) is actuated by the motor (11) and meshes with an upper toothed guide (25) formed on the upper guiding bar (2), and a stabilizer pinion (30) meshes with a lower toothed guide (31) which is formed on the lower guiding bar (3). The stabilizer pinion (30) is freely rotatable if the inclination of the guiding bars (2,3) exceeds a preset value, whereas the stabilizer pinion (30) is connected to the main driving pinion (21) if the inclination of the guiding bars (2,3) is lower than the preset value. <IMAGE>

Description

Stair lift for stair sections with variable slope.

The present invention relates to elevators of ladder for stair sections with variable slope.

It is known that stair lifts, used for example for the transport of wheelchairs for disabled people or chairs for the elderly, are regularly constituted by a mobile frame that can be slid on two guide rods that are connected to a fixed structure on the side of the stairs.

Obviously, the frame must hold a position fixed and stable with respect to the horizontal direction and, in consequently, it must be able to compensate for variations in pending that occur, for example, when there is a landing or Another type of tilt angle change.

Solutions are currently known and are given to know, for example, in patent application WO95 / 15909; the they substantially unveil a top guide bar and a lower guide bar that are connected to the wall and are arranged in a way that keeps mutual distance constant in the vertical direction The frame can be slid over the guides and is driven by a lower sprocket and an upper sprocket, which they are always connected to each other and are attached to supports corresponding teeth formed in said guides.

This solution allows to provide a optimal stability to the whole, but it has the disadvantage that requires extreme precision during manufacturing for the purpose of prevent the lower and upper sprockets from losing their inclination, since otherwise deformation efforts would occur that they would lead to the binding of the frame movement.

The mentioned precision during manufacturing as also during installation it is particularly critical when there are changes in slope, since from a point of mechanical view it is extremely difficult to maintain an inclination constant that provides security against the effort produced by the loss of said inclination which, in addition to compromising the set stability, can interrupt the operation of full form

The objective of the present invention is solve the problem mentioned above by unveiling a stair lift for stairs with slopes variable that allows compensation of any tilt variation without consequently producing an effort or the loss of stability of the whole.

Within the scope of that intention, a particular objective of the present invention is to disclose a stair lift in which slippage may occur mutual between the pinion that is coupled with the upper guide and the pinion that is coupled with the lower guide.

Another objective of the present invention is to give get to know a stair lift that, thanks to its characteristics of particular construction, is able to provide the largest guarantees of reliability and safety during use.

Another objective of the present invention is to give know a stair lift that can be obtained in a way simple starting from available elements and materials commercially in common and also be competitive from a Simply economic point of view.

This purpose and these objectives together with others which will be evident from the description provided in this document, they are achieved by a stair lift for stair sections with a variable slope, according to the present invention, comprising a top guide bar and a lower guide bar that can be fixed to a fixed structure and maintain a constant distance in a vertical direction, a movable frame that can be slid over said guide bars, said frame supporting a drive motor, a pinion main drive that is driven by said motor and that gear with an upper toothed guide that is formed in said top guide bar and a stabilizer pinion that meshes with a lower toothed guide that is formed in said guide bar lower, characterized in that said stabilizer pinion It can be rotated freely if the inclination of the mentioned guide bars exceeds a certain value in advance, also providing means to carry out the connection functional between said stabilizer pinion and said main pinion of drive that are driven if the inclination of said bars of guidance is less than said previously determined value.

Additional features and advantages of the present invention will be apparent from the description of a preferred but not exclusive embodiment of an elevator for ladder for stair sections with variable slope, shown a non-limiting example mode in the accompanying drawings, in the that:

Figure 1 is a schematic sectional view, taken along a vertical plane of the stair lift in accordance with the present invention; Y

Figure 2 is a front view of the elevator for stairs.

Referring to the mentioned figures formerly, the stair lift for stair sections with variable slope, according to the present invention, designated in general by the reference number (1), comprises a top guide bar (2) and a guide bar bottom (3) that can be fixed by means of wall anchors (4) or elements similar to a fixed structure that is constituted, for example, by a side wall (5) of the section of stairs.

The guide bars (2) and (3) run so that they maintain a constant distance in the vertical direction.

A mobile frame, generally designated by the reference number (10) can be slid over said guide rods, supports a drive motor (11) and is provided, for example, with a platform (9) in an area lower.

An upper transport element (12) and a lower transport element (13) coupled respectively said guide bars and oscillate with respect to the frame (10) so that ensure that the whole maintains a constant balance.

The upper transport element (12) is provided with two upper rollers (20) that fit the part upper bar (2) and have, in a lower area, a pinion main drive (21). Said pinion (21) is coupled to a drive shaft (22) which also constitutes a pivot for the oscillation of said transport element (12), which is provided with a lower roller (23) that is laterally adjacent to the pinion main drive (21), which meshes with a toothed support (25), consisting for example of holes arranged in the bar of guide (2).

Similarly, the transport element Lower (13) is also provided with two upper rollers, designated by the reference number (20a), and with a pinion stabilizer (30) that meshes with a toothed support (31) that is constituted, also in this case, by holes formed with a uniform passage in the lower guide bar (3).

The stabilizer pinion (30) is coupled to a auxiliary shaft (32) that acts as a swing pivot for the transport element (13), which is provided with a roller lower (23a).

The particularity of the present invention it consists in that said stabilizing pinion (30) can be rotated from free form in cases where the inclination of the sections of the guide bars exceeds a predetermined value, and conversely it is rotationally coupled, and consequently acts as stabilizer, in cases where the inclination of the sections of the guide bars is less than said default value.

During operation, the main shaft (22) it is driven by means of a pinion (40) that is coupled and is driven, by a chain (41), by a drive pinion (42) that is connected to the motor (11).

A first gear (50) is coupled to said shaft (22) and gears with a second gear (51) that is coaxial and faces a third gear (53) rotatably connected with an intermediate shaft (54) in which said gear (51) is connected in a rotating way.

Friction means (60) act between the gear (51) and gear (53), and constitute the means to provide the functional connection of the stabilizer pinion (30) to the pinion of drive (21).

The third gear (53) actually gears with a fourth gear (56) that is coupled to an auxiliary shaft (32).

The friction means (60) are driven by means of a drive rod (70) that interacts with the end (72) of an oscillator (73) presenting, at its other end (74), an eccentric follower roller (75) that interacts with a eccentric (76) supported by the transport element (12) and structured to interact by pushing the oscillator (73) when the guide inclination is less than a predetermined value, so that in this case the friction means (60) with driven, rigidly coupling the second (51) and third (53) gears and consequently rigidly and rotationally engaging the pinion main drive (21) and stabilizer pinion (30).

In the case of slopes that exceed that value predetermined, the eccentric (76) allows decoupling of the friction means (60), so that the stabilizer pinion (30) rotates freely with respect to the main drive pinion (21), avoiding any effort.

From the description given above, it is clear that the present invention achieves the objectives desired, and in particular the fact that it is disclosed a stair lift that, when the slope exceeds a value determined in advance, the set stabilization remains secured by gravity, which keeps the pinions (21) and (30) tightly coupled to the toothed supports (25) and (31), and only the main drive pinion (21) is motorized.

In the parts where the slope decreases, said main drive pinion (21) and said pinion stabilizer (30) are rigidly and rotatably coupled, avoiding the possibility of unwanted loss of inclination that can produce efforts, since the stable coupling of the two pinions with respect to the lower guide and the upper guide occurs only in previously determined sections, with a automatic functional decoupling, so that it is possible obtain optimum performance at all times.

In practice, the materials used, such as also the contingent shapes and dimensions may vary from according to the needs.

In cases that the technical characteristics mentioned in any claim are followed by numbers For reference, these references have been included with the only purpose of improving the intelligibility of said claims and consequently, said reference numbers have no limiting effect on the interpretation of each element identified by way of example by said reference numbers.

Claims (6)

1. Stair lift for ladder sections with variable slope, comprising an upper guide bar (2) and a lower guide bar (3) that can be fixed to a fixed structure (5) and have a constant distance in the vertical direction, a movable frame (10) that can be slid on said guide bars, said frame supporting a drive motor (11), a main drive pinion (21) which is driven by said motor and which meshes with a guide upper toothed (25) formed in said upper guide bar and a stabilizing pinion (30) that meshes with a lower toothed guide (31) that is formed in said lower guide bar, characterized in that said stabilizing pinion can rotate freely in case the inclination of said guide bars is greater than a predetermined value, also providing means (60) for carrying out the functional connection between said stabilizer pinion and dic ho main drive pinion which are driven if the inclination of said guide bars is less than said predetermined value. 2. Ladder elevator according to claim 1, characterized in that it comprises an upper transport element (12) having two upper rollers (20) that are coupled with an upper part of said upper guide bar and is associated in a rotary manner with a drive shaft (22) supporting said main drive pinion, a lower transport element (13) having two upper rollers (20a) and which rotatably rotates around an additional support shaft is also provided (32) of said stabilizer pinion. 3. Ladder elevator according to claim 2, characterized in that it comprises an upper roller (23) of said upper transport element which is laterally adjacent to said main drive pinion and a roller (23a) of said transport element which is laterally adjacent to said stabilizer pinion. 4. Ladder elevator, according to claim 2, characterized in that it comprises a first gear (50) that is coupled to said drive shaft and gear with a second gear (51) which is rotatably supported by an intermediate shaft ( 54) supporting a third gear (53) facing said second gear, said third gear engaging with a fourth gear (56) that is coupled to said auxiliary shaft, said functional connecting means acting between said second gear and said third gear. 5. Ladder elevator according to claim 4, characterized in that said functional connection comprises friction means which are arranged between said second gear and said third gear. 6. Ladder elevator according to claim 5, characterized in that said friction means are operatively associated with a drive rod (70), which interacts with the end of an oscillator (73) which supports, in its other end, an eccentric follower roller (75) that interacts with an eccentric (76) that is supported by said upper transport element.