ELEVATOR GUIDE RAIL

Abstract

A guide rail for an elevator system has an elongate length with a cross-section perpendicular to the length; the cross-section including a base section for mounting to a wall of a hoistway, and a blade section extending from the base section; the blade section including a guide surface for interacting with a guide element of a component movable in the elevator hoistway; the guide rail including: a pair of separate rail piece parts fixed together to form the guide rail; the pair of separate rail piece parts including a first rail piece part and a second rail piece part; the first rail piece part being formed from a first thickness of sheet material bent to have a cross-section of a first predetermined shape, and the second rail piece part being formed from a second thickness of sheet material bent to have a cross-section of a second predetermined shape.

Claims

1. A guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) for an elevator system (10), the guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) having an elongate length (L) with a cross-section perpendicular to the elongate length (L); the cross-section comprising a base section (120) for mounting to a wall of an elevator hoistway (14), and a blade section (130), the blade section (130) extending from the base section (120); wherein the blade section (130) comprises a guide surface (132) for interacting with a guide element (30, 34) of a component movable (12, 22) in the elevator hoistway (14); the guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) comprising: a pair of separate rail piece parts (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) fixed together to form the guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004); wherein the pair of separate rail piece parts comprises a first rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) and a second rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b); the first rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) being formed from a first thickness (t.sub.1, t.sub.2, t) of sheet material bent to have a cross-section of a first predetermined shape, and the second rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) being formed from a second thickness (t.sub.1, t.sub.2, t) of sheet material bent to have a cross-section of a second predetermined shape; and wherein the first rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) and the second rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) are fixed together such the first predetermined shape and the second predetermined shape together form the base section (120) and the blade section (130), and such that the blade section (130) has a cross-sectional width (W.sub.1, W.sub.2, W.sub.3) at the guide surface (132) that is equal to at least the sum of the first thickness (t.sub.1, t.sub.2, t) and the second thickness (t.sub.1, t.sub.2, t).

2. A guide rail according to claim 1, wherein the first thickness (t) is equal to the second thickness (t), and optionally wherein the first and second rail piece parts (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) are formed from the same type of sheet material.

3. A guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) according to claim 1, wherein the first rail piece part (110a, 110a; 1010a, 111a, 1100a) and the second rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) are fixed together in the blade section (130).

4. A guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) according to claim 1, wherein the sheet material comprises a sheet metal.

5. A guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) according to claim 1, wherein the first predetermined shape and the second predetermined shape each comprises an L shaped section; and wherein the cross-section of the guide rail (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) comprises a T shaped section formed from the pair of separate rail piece parts (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) fixed together.

6. A guide rail (100; 1000; 1000; 1001; 1002; 1003; 1004) according to claim 1, wherein the cross-sectional width (W.sub.2, W.sub.3) at the guide surface (132) is equal to at least double the sum of the first thickness (t.sub.1, t.sub.2, t) and the second thickness (t.sub.1, t.sub.2, t); and wherein each of the pair of separate rail piece parts (110a, 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) is folded back over itself to form the cross-section width (W.sub.2, W.sub.3) at the guide surface (132).

7. A guide rail (1000; 1000) according to claim 1, wherein the first rail piece part and/or the second rail piece part (1010a, 1010b, 1010b) further comprises: a cut-out portion (150) for part of the elongate length (L) of the guide rail (1000, 1000), the cut-out portion (150) removing at least a central part of the base section (120) and/or an adjacent part of the blade section (130) so as to leave a continuous guide surface (132) for the whole of the elongate length (L) of the guide rail (1000, 1000).

8. A guide rail (1000) according to claim 7, wherein the first rail piece part and/or the second rail piece part (1010b) further comprises an extended base portion (125) around the cut-out portion (150), connecting the base section (120) from either side of the cut-out portion (150) in the elongate length (L).

9. A guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) according to claim 1, wherein the first rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) and the second rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) are mechanically joined together.

10. A guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) according to claim 9, wherein the guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) further comprises holes in the blade section (130) away from the guide surface (132); and wherein the pair of separate rail piece parts (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) are mechanically joined together using rivets or bolts which utilize the holes in the blade section (130).

11. A guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) according to claim 8, wherein the first rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) and the second rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) are mechanically joined by the sheet material of the first and second rail piece parts (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) having been clinched together.

12. An elevator system (10) comprising: a hoistway (14); a component (12, 22) movable in the hoistway (14), comprising at least one guide element (30, 34); a combined guide rail (2000) mounted to a wall of the hoistway (14), the combined guide rail (2000) comprising a standard guide rail (28, 32) and the guide rail (1000) of claim 1; wherein the standard guide rail (28, 32) and the guide rail (1000) have substantially similar guide surfaces (132) to smoothly guide the at least one guide element (30, 34); wherein the standard guide rail (28, 32) is installed in a lower section of the hoistway (14), and the guide rail (1000) is installed above the standard guide rail (28, 32), and wherein the standard guide rail (28, 32) and the guide rails (1000) are arranged next to one another along the hoistway (14) to form a continuous guide path along the guide surfaces (132); and wherein the component (12, 22) is configured to move along the guide path in the hoistway (14).

13. A method for manufacturing a guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) for an elevator system (10); the guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) having an elongate length (L) with a cross-section perpendicular to the elongate length (L); the cross-section comprising a base section (120) and a blade section (130), the blade section (130) extending from the base section (120); the method comprising: providing a pair of separate rail piece parts (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b), the pair of separate rail piece parts (comprising a first rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) and a second rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b); the first rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) being formed from a first thickness (t.sub.1, t.sub.2, t) of sheet material bent to have a cross-section of a first predetermined shape, and the second rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) being formed from a second thickness (t.sub.1, t.sub.2, t) of sheet material bent to have a cross-section of a second predetermined shape; and fixing together the first rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) and the second rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b), such that the first predetermined shape and the second predetermined shape together form the base section (120) and the blade section (130) of the guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004), and such that the blade section (130) has a cross-sectional width (W.sub.1, W.sub.2, W.sub.3) at the guide surface (132) that is equal to at least the sum of the first thickness (t.sub.1, t.sub.2, t) and the second thickness (t.sub.1, t.sub.2, t).

14. A method of manufacturing a guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) according to claim 13, wherein the method for manufacturing a guide rail (100; 100; 1000; 1000; 1001; 1002; 1003; 1004) further comprises: cutting the first rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) of the elongate length (L) from a first thickness (t.sub.1, t.sub.2, t) of sheet material; cutting the second rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) of the elongate length (L) from a second thickness (t.sub.1, t.sub.2, t) of sheet material; bending the first rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) along at least one fold line (160a, 160b) parallel to the elongate length (L) to create a cross-section of a first predetermined shape; and bending the second rail piece part (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) along at least one fold line (160a, 160b) parallel to the elongate length (L) to create a cross-section of a second predetermined shape.

15. A method of manufacturing a guide rail (100; 100; 1000; 1001; 1002; 1003; 1004) according to claim 13, the method further comprising: bending a thickness (t.sub.1, t.sub.2, t) of sheet material along at least one fold line (160a, 160b) to create a folded part with a cross-section of a predetermined shape; and cutting the pair of separate rail piece parts (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) from the folded part, each of the pair of separate rail piece parts (110a, 110b; 110a; 110b; 1010a, 1010b; 1010b; 111a, 111b; 1100a, 1100b) having the elongate length (L).

Description

DRAWING DESCRIPTION

[0045] Certain preferred examples of this disclosure will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0046] FIG. 1 is a schematic view of an elevator system;

[0047] FIG. 2 shows a perspective view of an elevator guide rail according to an example of the present disclosure;

[0048] FIG. 3A shows a cross-sectional view of a pair of separate rail piece parts fixed together to from a guide rail according to an example of the present disclosure;

[0049] FIG. 3B shows a perspective view of the guide rail of FIG. 3A;

[0050] FIG. 3C shows the guide rail of FIG. 3A and FIG. 3B in combination with a guiding element;

[0051] FIG. 4A shows a perspective view of an elevator guide rail according to a further example of the present disclosure;

[0052] FIG. 4B and FIG. 4C show two zoomed in perspectives of the fixing of pair of separate rail piece parts by clinching to form the guide rail of FIG. 4A;

[0053] FIG. 5 shows a schematic view of an example elevator system according to the present disclosure;

[0054] FIG. 6 shows a perspective view of an elevator guide rail with a cut-out portion according to a further example of the present disclosure;

[0055] FIG. 7 shows a first perspective view of an elevator guide rail with a cut-out portion and extended base portion according to a further example of the present disclosure;

[0056] FIG. 8 shows a second perspective view of the elevator guide rail of FIG. 7;

[0057] FIG. 9A-9D show cross-sectional views of additional examples of a guide rail according to the present disclosure;

[0058] FIG. 10 shows a flow-chart representing the method for manufacturing a guide rail according to the present disclosure.

DETAILED DESCRIPTION

[0059] FIG. 1 is a schematic view of an example elevator system 10. The sections and components of the elevator system 10 not necessary to the understanding of the present disclosure are not shown. The elevator system 10 includes an elevator car 12 and counterweight 22 movable in an hoistway 14. The elevator car 12 is suspended in the hoistway 14 by means of one or more tension members 16, for example a rope or a belt. The tension members 16 interact with one or more sheaves 18 which can be routed around various components of the elevator system 10. One of the sheaves may be a traction sheave 24 actuated by a machine 26 to raise and lower the elevator car 12 in the hoistway 14. The tension members 16 are also connected to the counterweight 22, which is used to provide balance to the elevator system 10 and minimise the difference in tension between the tension members 16 on either side of the traction sheave 24. Various roping arrangements will be known to those skilled in the art, including a 1:1 and 2:1 roping ratio.

[0060] To guide the movement of the elevator car 12 and the counterweight 22 in the hoistway 14, elevator car guide rails 28 and counterweight guide rails 32 are secured in the hoistway 14. The guide rails 28, 32 may be mounted directly onto the hoistway 14 wall, or may be mounted indirectly to the hoistway 14, for example via additional brackets (not shown). The guide rails 28, 32 define a guide path for the movement of the elevator car 12 and counterweight 22 respectively. The elevator car 12 and counterweight 22 include one or more guiding elements, for example elevator guide shoes 30 and counterweight guide shoes 34 which move along a guide surface (not shown) on the guide rails 28, 32. Other components may also interact with the guide rails 28, 32, which are not here shown, for example safety brakes which are arranged to halt the movement of the elevator car 12.

[0061] Whilst an example elevator system 10 has been described above, the skilled person will understand that this is by means of example only, and that the invention as disclosed herein may be suitable for various types of elevator systems.

[0062] It will be appreciated that, whilst a roped elevator with a counterweight is described herein, the examples of guide rails described herein will work equally well with a ropeless elevator system e.g. hydraulic, pinched wheel propulsion systems, systems with linear motors, or any other desired means of propelling an elevator car.

[0063] FIG. 2 shows an example elevator guide rail 100, made from a first rail piece part 110a and a second rail piece part 110b fixed together. The first rail piece part 110a and the second rail piece part 110b are collectively referred to as a pair of separate rail piece parts 110a, 110b. The guide rail 100 has an elongate length L, and a cross-section perpendicular to the elongate length L. In cross-section, the guide rail 100 has a base section 120 and a blade section 130 protruding from the base section 120, and the blade section 130 has a guide surface 132 designed to interact with a guiding element (not shown) as described above with reference to FIG. 1. Each of the pair of separate rail piece parts 100a, 100b, is made from a set thickness of sheet material which is cut so as to have the elongate length L, and then bent along a first fold line 160a (as showed by the dotted line) into a three-dimensional shape with cross-section of a predetermined shape. For example, the first rail piece part 110a has a first thickness t.sub.1 and the second rail piece part has a second thickness t.sub.2. In this example, each of the pair of separate rail piece parts 110a, 110b has an L shaped cross-section, such that each of the pair of separate rail piece parts 110a, 110b has a base portion 120a, 120b and a blade portion 130a, 130b. The pair of separate rail piece parts 110a, 110b are fixed together so the blade section 130 is formed from two layers of sheet material fixed together, giving the blade section 130 a cross-sectional width W.sub.1 equaling the sum of the first thickness t.sub.1 and the second thickness t.sub.2. The guide rail 100 therefore has a T shaped cross-section formed from the L shaped pair of separate rail piece parts 110a, 110b fixed together.

[0064] It will be appreciated by the skilled person that the elongate length L of the guide rail 100 can be made to any suitable length, and standard elevator guide rail lengths are usually made to 5 m or 10 m. It will also be appreciated that the exact shape of the base section 120 of the guide rail 100 can be adapted for different types of elevator system, whether the guide rails require attaching directly to a hoistway wall, or indirectly to a hoistway wall via a number of brackets, or attaching to another length of guide rail so multiple guide rails sit side by side in the elevator hoistway. The width W.sub.1 of the cross-section at the guide surface 132 must correspond to the requirements of any guiding element (e.g. an elevator car guide shoe). The whole of the blade section 130 may have the guide surface 132, or only part of the blade section 130 may have the guide surface 132.

[0065] Whilst the labels first and second have been used to distinguish each of the pair of separate rail piece parts, it will be appreciated that these labels are arbitrary in nature, and are used only to aid with the understanding about the form of the pair of rail piece parts. In some of the examples described herein the first and second rail piece parts have different properties, however in some other examples, the pair of separate rail piece parts have different properties (i.e. predetermined shapes, thicknesses, etc.)

[0066] FIG. 3A, FIG. 3B and FIG. 3C show another example of an elevator guide rail 100. The guide rail 100 has the same main components as the embodiment described above with reference to FIG. 2. In this example, the pair of separate rail piece parts 110a, 110b (i.e. a first rail piece part 110a, and a second rail piece part 110b) are shown to have the same thickness t of sheet material, and are fixed together (as shown schematically by the dashed line 140) in the blade section 130 as shown in FIG. 3A, the double arrow indicating the pair of separate rail piece parts 110a, 110b being brought together during a fixing process. Each of the pair of separate rail piece parts 110a, 110b has a base portion 120a, 120b, a blade portion 130a, 130b, and a guide surface portion 132a, 132b. In this example the ends of each of the pair of separate rail piece parts 110a, 110b are bent back over themselves at the end of the blade section 130 (i.e. along a second fold line 160b) to form the guide surface portion 132a, 132b, and therefore a wider section for the guide surface 132. The cross-sectional width W.sub.2 at the guide surface 132 (i.e. from one guide section portion 132a to the other guide section portion 132b) is therefore four times the thickness t of sheet material. A guide shoe 30 can then sit over the guide rail 100 at the guiding surface 132 as shown in FIG. 3C.

[0067] FIG. 4A, FIG. 4B, and FIG. 4C show a similar example guide rail 100 to that shown in FIGS. 3A-3C, and show how the pair of separate rail piece parts 110a, 110b can be fixed together, and how the guide rail 100 may be fixed to the hoistway (not shown). The guide rail 100 is shown with holes 115 in the base section 120 which can be used to fix the guide rail 100 in an elevator hoistway as discussed above. In the blade section 130 fixing points 140a are shown, and these fixing points 140a are in the blade section 130 away from the guide surface 132 so as not to interfere with the guiding element of the component moving along the guide path (e.g. a guide shoe on an elevator car as discussed above). In this example the pair of separate rail piece parts 110a, 110b are fixed together by clinching (i.e. press-joining) the two sheets of material together as shown in FIG. 4B and FIG. 4C. It will be appreciated that whilst this example shows the pair of separate rail piece parts 110a, 110b fixed together by clinching, other methods of fixation are also suitable so long as the pair of separate rail piece parts 110a, 110b are firmly fixed together in an appropriate manner. In some examples the guide rail is formed from welding the pair of separate rail piece parts 110a, 110b together. In some further examples, the guide rail 100 is formed by using holes in similar locations to the clinching through which the pair of separate rail piece parts 110a, 110b can be bolted or riveted together.

[0068] It will be appreciated that the holes 115 and/or fixing points 140a shown in FIG. 4A can be applied to any of the example guide rails described herein, although for clarity, some of the FIGS. do not explicitly show them. Equally, various other fixation methods may be available to the skilled person which means holes and/or fixing points are not required in some applications of the examples herein, for example using spot welding.

[0069] In some elevator systems, components in the hoistway can interfere with the placement of the guide rails. An example of this can be seen in the schematic diagram of an elevator system 10 shown in FIG. 5, which will be appreciated as not showing any of the components to scale, but merely showing a representation of the outlined problem. A movable component 12 (e.g. an elevator car) with guiding elements 30 (e.g. guide shoes) is shown relative to a combined guide rail 2000. The combined guide rail 2000 comprises a section of guide rail 1000 of the present disclosure, along with a section of a standard guide rail 28. In this example of an elevator system having a very compact layout, the machine 26 is located such that it interferes with the guide rail 1000. In this example the base section 120 and lower part of the blade section 130 need to be removed (as shown by the dashed lines) to provide space for the machine 26, whilst leaving a continuous guide surface 132 for the guiding element 30 of the elevator car 12 to move along a guide path. The interference issue between the machine 26 and the guide rail 1000 is only at the very top of the hoistway (not shown). It may then be possible to use a standard guide rail 28 for the lower section of the hoistway, and connect it to a section of the guide rail 1000 disclosed herein for the top section of the hoistway, which can be adapted to prevent interference as described below with reference to FIGS. 6-8.

[0070] It will be appreciated that whilst in this example a machine 26 located at the top of an hoistway is interfering with the guide rail 1000, other elevator system components in other locations in the hoistway may also have interference problems with the guide rail in a hoistway. In these examples a section of adapted guide rail 1000 may be used, or the whole of the guide rail in the hoistway may be a guide rail as disclosed herein.

[0071] FIG. 6 shows the guide rail 1000 with all the features of the previously described guide rail 100 described with reference to FIGS. 3-4, with a pair of separate rail piece parts 1010a, 1010b. In the guide rail 1000, the pair of separate rail piece parts 1010a, 1010b additionally have a cut-out portion 150 to prevent interference with an elevator component as described above with reference to FIG. 5. The dashed lines indicated in FIG. 5 represent the area of interference is prevented by utilizing a cut-out portion 150. The cut-out portion 150 is for the part of the elongate length L which would otherwise have interfered with a component in the hoistway, and in this example removes the base section 120 and lower part of the blade section 130 for that part of the elongate length L, leaving a continuous guide surface 132. Whist this example is shown removing identical (symmetric) sections from both of the pair of separate rail piece parts 1010a, 1010b it may only be necessary to remove some of one of the pair of separate rail piece parts 1010a, 1010b. In some examples the interference may only require a cut-out portion for part of the base section 120, and/or the blade section 130.

[0072] FIG. 7 and FIG. 8 show a further example of a guide rail 1000 with cut-out portion 150 from two different perspectives. The cut-out portion 150 is the same as the cut-out portion 150 shown in FIG. 6, however in this example one of the pair of separate rail piece parts, the second rail piece part 1010b, has an extended base portion 125b around the cut-out portion 150, connecting the base section 120 from either side of the cut-out portion 150 in the elongate length L. It will therefore be appreciated that in this example, the first rail piece part 1010a has a first predetermined shape, and the second rail piece part 1010b has a second predetermined shape. The extended base portion 125b may be only on one of the pair of separate rail piece parts e.g. the second rail piece part 1010b as shown in FIG. 7 and FIG. 8, however in some other examples (not shown) both of the pair of separate rail piece parts may have extended base portions (and the pair of separate rail piece parts may have the same, but mirrored, predetermined shapes).

[0073] It will be appreciated that whilst FIG. 6-FIG. 8 are shown with the folded back guide surface portions 132 in the blade section 130 so the guide surface 132 has a width W.sub.2 equaling four times the thickness of the sheet material, the cut-out portion 150 may be equally applied to any other configuration described herein (e.g. the example of FIG. 2), so long as the guide surface 132 remains continuous to form a continuous guide path (e.g. for a guiding element to move along).

[0074] Other cross-sectional profiles for a guide rail may also be suitable as shown in FIG. 9A-FIG. 9D. It will be appreciated that the cross-sections shown in these figures will have an elongate length in the same way as previously described with reference to FIG. 2-FIG. 8. Any of these profiles may also be suitable for including a cut-out portion, and/or may include an extended base portion on one or both sides, as described with reference to FIG. 6-FIG. 8. The various parts are fixed together at least where indicated by the dashed lines 140, where the double arrows represent any parts being brought together during a fixing step during manufacture as described below.

[0075] FIG. 9A shows a guide rail 1001 cross section with additional pieces of sheet material 112a, 112b, 122 added to the basic structure of a pair of separate rail piece parts 110a, 110b. In this example the guide rail 1001 has a pair of L shaped stabilisers 112a, 112b fixed to the outer surface of the pair of separate rail piece parts 110a, 110b, in the blade section 130 and the base section 120, and sitting below the bent over guide surface portions 132a, 132b on the blade section 130. In this example the guide rail 1001 also has a base reinforcer 122 made from an additional flat piece of a sheet material fixed to both of the pair of separate rail piece parts 110a, 110b, and spanning the base section 120 across the bottom of the blade section 130.

[0076] FIG. 9B shows a guide rail 1002 cross section with pair of separate rail piece parts 1100a, 1100b fixed together as shown by the dashed line 140. The cross-sectional shape of each of the pair of separate rail piece parts 1100a, 1100b has an upturning portion 122a, 122b as the end of each of the base portions, such that the base section 120 of the guide rail 1002 turns upwards at its outer edges. This can improve rigidity of the base section 120.

[0077] FIG. 9C shows a guide rail 1003 cross section with additional pieces of sheet material added to the basic structure of a pair of separate rail piece parts 110a, 110b. In this example the guide rail 1003 has a blade reinforcer 135, and a base reinforcer 122 (as also shown in FIG. 9A). The various parts are fixed together at least where indicated by the dashed lines 140. The blade reinforcer 135 is an additional flat piece of sheet material fixed between the blade portions of the pair of separate rail piece parts 110a, 110b. In this example the blade reinforcer 135 extends for the whole of the height of the blade section 130, however it will be appreciated that it may only extend for part of the height of the blade section 130 (e.g. just between the guide surface 132 at the top of the blade section 130). The base reinforcer 122 spans both base portions of the pair of separate rail piece parts 110a, 110b. The base reinforcer 122 may extend for the whole of the base section 120 or may only extend across part of the base section 120.

[0078] FIG. 9D shows a guide rail 1004 with an alternative cross section at the guide surface (i.e. the end of the blade section 130) so that the guide surface has an increased width W.sub.3 of six times the thickness t of the sheet material. Whilst in FIG. 3-FIG. 9C the guide surface portions 132a, 132b are made by folding the sheet material back over itself once, in this example the sheet material is folded again so in the guide surface portions 132a, 132b each of the pair of separate rail piece parts 111a, 111b folds back over itself twice. The pair of separate rail piece parts 111a, 111b are then fixed together as described above and as indicated by the dashed line 140.

[0079] It will be appreciated that whilst each example above has been described separately, any of the various configurations may be combined, or selectively introduced. For example, only one additional piece of sheet material may be used (e.g. one of the pair of stabilisers, or only a base reinforcer, or only a blade reinforcer), or any combination of the examples (e.g. a single stabiliser and a blade reinforcer, or a bent base with a base reinforcer, etc.).

[0080] FIG. 10 is a flowchart outlining a method 200 for manufacturing an elevator guide rail as described in some of the examples described herein. It will be appreciated by the following description, that this example method is most suited for the example where the first rail piece part and the second rail piece part are formed from the same thickness of a single type of sheet material. In step 210 a sheet material is bent lengthways (i.e. along a fold line) so as to create a folded part with cross-section of a predetermined shape, for example by bending into any of the shapes as outlined above, i.e. by bending each of the pair of separate rail piece parts between the base portion and the blade portion, and to form the guide surface portion. Bending may be performed using any method as will be appreciated by those skilled in the art, for example bending the sheet material in a press brake, or using roll-forming methods. Bending may be performed on a predetermined width of material suitable for folding into the predetermined shape. Bending may be performed on a length of sheet material of various lengths. In some examples the length of sheet material used is a multiple of the elongate length, so multiple individual separate rail piece parts are bent into shape at the same time.

[0081] In step 220 the pair of separate rail piece parts is cut from the folded part to give the elongate length. The cutting may include punching holes for the fixation of the guide rail to a hoistway, and/or for fixing the pair of separate rail piece parts together. The cutting step may include cutting out a section from the length to allow for the cut-out portion as outlined above. Cutting of the sheet material into the elongate length may be performed separately to the cutting of holes and/or the cut-out portion. The cutting of the holes and/or the cut-out portion may be performed prior to the above bending step. Cutting may be performed using any suitable method as will be apparent to those skilled in the art, for example laser cutting or punching the flat forms.

[0082] In step 230 the pair of separate rail piece parts are fixed together. The pair of separate rail piece parts are fixed together at least in the blade section so as not to interfere with the guide surface. The pair of separate rail piece parts are fixed together so that their predetermined shapes together form the blade section and the base section, and so that the blade section has the required cross-sectional width at a guide surface. In the fixing step, additional pieces of sheet material may also be fixed to the pair of separate rail piece parts, for example a blade reinforcer, a base reinforcer, or one or more stabilisers. The pieces of sheet material may be fixed together using any suitable fixing method as will be appreciated by those skilled in the art. The pair of separate rail piece parts may be mechanically joined together, for example by bolting, riveting or clinching the pieces of sheet material together. In some examples, adhesive may be used. In some examples, welding may be used.

[0083] It will be appreciated that the method steps herein described may be performed in various orders, depending on the mass production methods used, and the similarity or dissimilarity of the pair of separate rail piece parts. For example, the sheet material may first be cut to required lengths, and then be bent into shape. In some examples, the bending and the cutting may be performed using a single piece of equipment. In some examples the pair of separate rail piece parts may be bent into shape, then joined together, with cutting being the final production step.

[0084] It will be appreciated that any suitable sheet material may be used for any of the guide rail parts as disclosed above. It is advantageous for all pieces used for the same guide rail to be made from the same type of sheet material to prevent any corrosion due to material chemistry mismatch or any one part causing any other type of damage on another part. Guide rails are usually made from steel due to the advantageous properties of steel. The guide rail of the present disclosure may be made from sheet metal e.g. galvanized steel. Whilst current safety norms for elevator systems may require a particular material, it is appreciated that the present disclosure would be suitable for other types of sheet material not herein disclosed, which produce parts with suitable properties (e.g. strength, toughness, wear resistance) for making an elevator guide rail.

[0085] It will be appreciated that a guide rail cross-section may be implemented with fully symmetrical pairs of separate rail piece parts, or the pairs of separate rail piece parts may not be symmetrical, as long as they are fixed together so as to provide a continuous guide surface as a guide path (e.g. for a guiding element on a movable component in the hoistway). Similarly, although the examples shown here show a guide rail with a single blade section, the combination of folded sheet material parts fixed together in the blade section may also be used to form guide rails with multiple blade sections, which allow for two or more parallel guide paths in an hoistway.

[0086] As described above, it may be suitable to use a guide rail like that described with reference to FIGS. 6-8 in combination with another type of standard guide rail as will be known to those skilled in the art (e.g. a standard solid T shaped guide rail). In such examples it may be desirable to match at least the cross-section width at the guide surface 132 between the standard guide rail and a guide rail as disclosed herein, so as to have a continuous guide path for the guiding element of the movable component. It will be appreciated that the cross-section width is dependent on the combination of the sheet material thickness of the pair of separate rail piece parts. It may be possible to match additional dimensional features of a standard guide rail, however as long as there is a continuous guide path provided by continuity in the guide surface between the two types of guide rail the other dimensions of the guide rail can be dependent on the space in the hoistway in which the guide rail is mounted. In some examples the two types of guide rail may have a small gap as long as the smooth movement of the guiding element is not affected (e.g. 1 mm). In some examples the two types of guide rail are mounted separately to the hoistway. In some examples the two types of guide rail are connected together (e.g. using a fishplate bracket).

[0087] It will be appreciated by those skilled in the art that the disclosure has been illustrated by describing one or more specific aspects thereof, but is not limited to these aspects; many variations and modifications are possible, within the scope of the accompanying claims.