A LAST FOR FOOTWEAR MANUFACTURING
20240324728 ยท 2024-10-03
Inventors
Cpc classification
International classification
Abstract
A last for footwear production. The last includes: a last body and a heel body part. The heel body part is configured to be movable in relation to the last body part. The last further includes a forefoot body part configured to be movable in relation to the last body. The heel body part and/or the forefoot body part is/are configured to be movable in relation to the last body by at least one coupling arrangement. The at least one coupling arrangement is configured such that the heel body part and the forefoot body part are at least partly movable towards each other.
Claims
1. A last for footwear production, wherein the last comprises: a last body, and a heel body part, wherein said heel body part is configured to be movable in relation to the last body, and wherein the last further comprises a forefoot body part, said forefoot body part being configured to be movable in relation to the last body, wherein said heel body part and/or said forefoot body part is/are configured to be movable in relation to the last body by at least one coupling arrangement, wherein said at least one coupling arrangement is configured such that said heel body part and said forefoot body part are at least partly movable towards each other.
2. The last according to claim 1, wherein the last comprises an open position and an operational position.
3. The last according to claim 2, wherein said heel body part in said open position of the last has been moved at least partly towards a toe end of the last and wherein said forefoot body part has been moved at least partly towards a heel end of the last.
4. The last according to claim 1, wherein the last further comprises a lower surface, wherein the lower surface has a toe end and a heel end, wherein the lower surface has a length (TL) between the toe end and the heel end, and wherein a length (TL2) of the lower surface in open position is shorter than the length (TL) of the lower surface in operational position.
5. The last according to claim 4, wherein the length (TL2) of the lower surface in open position is between 2-10% shorter than the length (TL) of the lower surface in operational position.
6. The last according to claim 4, wherein the length (TL2) of the lower surface in open position is at least 4% shorter than the length (TL) of the lower surface in operational position.
7. The last according to claim 4, wherein said forefoot body part in an open position of the last is inclined by an angle (a) in relation to said lower surface, wherein said angle is at least 5?.
8. (canceled)
9. The last according to claim 4, wherein said forefoot body part has a length (TLF) from the toe end and in a direction along the lower surface, which is at least 10% of the length of the lower surface in operational position.
10. The last according to claim 1, wherein said last has a girth measurement at a high instep position (D) that in an open position is less than or equal to the girth measurement at the high instep position (D) in closed position of the last.
11. The last according to claim 1, wherein said last has a girth measurement from back of heel to instep (H) that in an open position is less than the girth measurement from back of heel to instep (H) in closed position of the last.
12. (canceled)
13. The last according to claim 1, wherein the coupling arrangement comprises a linked bar mechanism including: a heel bar and a forefoot bar, which are each pivotably attached to the last body at an intermediate position and mutually linked at one end of the heel bar and the forefoot bar, respectively, and where the other end of the heel bar and the forefoot bar, respectively, is linked to the heel body part and the forefoot body part, respectively.
14.-15. (canceled)
16. The last according to claim 11, wherein said forefoot bar is arranged in an open position of the last to be inclined in an angle (b) in relation to said lower surface, wherein said angle is at least 10?.
17. (canceled)
18. The last according to claim 1, wherein said last is configured for independent movement of said forefoot body part or said heel body part.
19. (canceled)
20. The last according to claim 1, wherein said last comprises a decoupling arrangement for decoupling movements of said heel body part and said forefoot body part.
21. (canceled)
22. A method for manufacturing a footwear, the method comprising steps of: providing a last for footwear production, said last comprising a last body and a heel body part, wherein said heel body part is configured to be movable in relation to the last body, and wherein the last further comprises a forefoot body part, said forefoot body part being configured to be movable in relation to the last body, wherein said heel body part and/or said forefoot body part is/are configured to be movable in relation to the last body by at least one coupling arrangement, wherein said at least one coupling arrangement is configured such that said heel body part and said forefoot body part are at least partly movable towards each other; moving at least one of said heel body part and said forefoot body part in relation to said last body from an operational position of the last, applying a footwear upper to the last, returning said at least one of said heel body part and said forefoot body part to bring the last to an operational position.
23. The method for manufacturing the footwear according to claim 22, wherein said method further comprises a step of activating at least one coupling arrangement for moving said heel body part and said forefoot body part in relation to said last body from an operational position of the last.
24. The method for manufacturing the footwear according to claim 22, wherein said method further comprises a step of deactivating the at least one coupling arrangement for returning said heel body part and said forefoot body part to bring the last to an operational position.
25. The method for manufacturing the footwear step of activating of the at least one coupling arrangement is mediated via operation of an operator rod.
26.-27. (canceled)
28. The method for manufacturing the footwear according to claim 22, wherein the method further comprises a step of applying a sole to the upper by direct injection process including direct injection process material.
29. (canceled)
30. The method for manufacturing the footwear according to claim 28, wherein the direct injection process material is TPR, PVC, EVA, TPU, or PU.
31.-34. (canceled)
Description
THE FIGURES
[0090] The invention will be explained in further detail below with reference to the figures of which
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DETAILED DESCRIPTION
[0105] With reference to
[0106] A footbed in the present context, unless otherwise noted, may thus e.g. include both insole (if present), different sole members and/or layers. In particular embodiments of the invention further layers or members may be attached to the footbed or the layers may be included within the footbed. Hereby, several variations of the order of the material of the footbed are possible either as a single material or as sandwich constructions of materials.
[0107] With reference to
[0108] An embodiment of a last 10 according to the invention for footwear production is illustrated in
[0109] In
[0110] In
[0111]
[0112]
[0113] Even further, the heel bar 42 and the forefoot bar 44 are at their other ends designed for being connected with the heel body part 18 and the forefoot body part 20, respectively. Thus, the heel bar 42 is configured with a heel bar slot 56, which cooperates with a heel body pin 52 that is fixed to the heel body part 18. In a corresponding manner, the forefoot bar 44 is configured with a forefoot bar slot 58, which cooperates with a forefoot body pin 54 that is fixed to the forefoot body part 20. Thus, in case the heel body part 18 is moved upwards in the scenario shown in
[0114] The heel bar 42 and the forefoot bar 44 are furthermore shown in
[0115] It should be noted that this linked bar mechanism 40 may be configured in various manners in order to achieve specific movements of the heel body part 18 and the forefoot body part 20. For example, the length of the heel bar 42 and the forefoot bar 44 may be varied and the position of the pin bores of each of the heel bar 42 and the forefoot bar 44 may be varied, e.g. to achieve different lengths of the bar arms from the pivot point (last body pin 46) meeting each other at the linkage pin 48. Thus, a gearing of the movements may be achieved, e.g. with a relatively small angular movement of the heel bar 42 resulting in a relatively large angular movement of the forefoot bar 44 and thus also the forefoot body part 20 or vice versa. Also, it will be understood that the arrangement may be such that the heel bar 42 and the forefoot bar 44 may move essentially identical angles.
[0116] It should be noted that other linkages or mechanisms than a linked bar mechanism may be utilized for transforming movement between the heel body part and the forefoot body part. For example, toothed mechanisms may be used, mechanisms using gear wheel or gear segments, where e.g. a gear segment is coupled to an axle with an operating arm or coupled directly to an operating arm may be utilized. When using such mechanisms, gearings between the movements of the heel body part and the forefoot body part may be arranged, similar to what was explained above in connection with the linked bar mechanism 40.
[0117] Other mechanisms may be arranged for performing the function of the coupling arrangement 22, e.g. moving the heel body part 18 and the forefoot body part 20 simultaneously or possibly staggered, when one of these is being moved upwards and subsequently downwards again, for example actuated by an operator rod.
[0118] It is noted that the heel body part 18 and the forefoot body part 20 may be further guided in relation to the last body 16, e.g. by guiding structures 60 on the last body and corresponding guiding structures arranged in connection with heel body part 18 and the forefoot body part 20, which serve to guide the parts in a desired manner to achieve the function that the heel body part 18 and the forefoot body part 20 move upwards (as seen when the last is positioned as shown in e.g.
[0119] It is further noted that the linkage mechanisms, pins, gears, etc. and other parts used in connection with the coupling arrangement 22 due to the strain and wear induced may be made from metal, e.g. steel. However, other materials may be used instead, such as synthetic materials, polymers, etc.
[0120] As regards parts such as the last body 16, the heel body part 18 and/or the forefoot body part 20, it is noted that these may be made from metal, e.g. aluminium, but that other materials may be used as well, such as synthetic materials, polymers, 3D printed materials, etc.
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[0122] Thus,
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[0125] It will be understood that the heel bar 42 and the forefoot bar 44 may be fixed within the last body 16, e.g. with the last body pins as described above, ready for being coupled to a heel body part and a forefoot body part.
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[0128] In
[0129] According to an example, the distance from toe to heel may have been reduced by around e.g. 3.7%, e.g. the reduction from TL to TL1.
[0130] However, when utilizing the last 10 as illustrated in
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[0132] Furthermore, it is illustrated in
[0133] The angle a formed by said forefoot body part 18 in relation to said lower surface 24 may be at least 10?, such as at least 15?, such as at least 20? or such as at least 25?.
[0134] Further, it is illustrated that the forefoot bar 44 may in an embodiment be arranged such that in an open position of the last it may be inclined in an angle b in relation to said lower surface 24, wherein said angle is at least 10?, such as least 20?, such as at least 30?, such as at least 40? or such as at least 45?. Hereby, suitable inclination angles a of the forefoot body part 20 may be achieved.
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[0136] Thus, the D point measurement is the girth at high instep of the last and the H point measurement is the girth from back of heel to instep of the last 10 as illustrated in the figures. As it will be understood, these measurements are indicative of the volume of the last at the respective points. The respective measurements may for example be made using e.g. a flexible measuring tape in order to measure the girth at the respective points, along the surface of the last and following the lines as indicated in
[0137] It will be clear that the D point measurements and the H point measurements will depend on the modes of the last, e.g. whether the last is in the operational position (closed last) as shown in
[0138] In Table 1 below, measurements have been made on a last designed for a US size 4% (European size 37).
TABLE-US-00001 TABLE 1 Open position Closed last Heel opened of last D point measurement 333 mm 350 mm 333 mm H point measurement 360 mm 365 mm 350 mm
[0139] As it will be seen, both D point measurements and H point measurements increase, when the heel is opened, e.g. as is the case with the above-mentioned prior art last, thereby indicating that the job of lasting a footwear upper on such a last with opened heel will be more difficult due to the increased girth (or volume) of the last at the D point and the H point.
[0140] However, as it furthermore will be seen from the measurements of Table 1, when the heel as well as the forefoot body part have been opened, bringing the last according to the present invention to its open position, the D point measurement will in this position be the same as in the closed position, meaning that the volume at the D point has not been increased. Furthermore, it is noted that H point measurement in the open position has actually been reduced as compared to the closed position, meaning that the volume at the H point has been reduced, which will make it easier to perform a lasting of an upper on a last according to the present invention. All in all, since the D point measurement is not increased and since the H point measurement is reduced as compared with a closed last, it will be understood that the lasting of a footwear upper will be made less complicated and may be made with less effort, e.g. if performed manually. Furthermore, it will be understood that even further advantages may be achieved when compared to the above-mentioned prior art last with movable heel, for which the D point measurement as well as the H point measurement are increased.
[0141] Hence, it will be seen that by the invention length reductions as well as volume reductions may be achieved, whereby lasting may be performed easier and with less effort.
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[0143] As shown in
[0144] It will be understood that the heel body part 18 may also be moved independently as indicated by the short dash double-arrow in
[0145] As mentioned above, the last 10 may comprise a linked bar mechanism 40, which may be decoupled in case it is desired to move e.g. the forefoot body part 20 manually. A decoupling may be done in various manners, e.g. by disconnecting the heel bar 42 and the forefoot bar 44 (
[0146] In the above description, various aspects and embodiments of the invention have been described with reference to the drawings, but it is apparent for a person skilled within the art that the invention can be carried out in an infinite number of ways, using e.g. the examples disclosed in the description in various combinations, and within a wide range of variations within the scope of the appended claims.
LIST OF REFERENCES
[0147] 10 Last [0148] 12 Heel [0149] 14 Forefoot [0150] 16 Last body [0151] 18 Heel body part [0152] 20 Forefoot body part [0153] 22 Coupling arrangement [0154] 24 Last lower surface [0155] 26 Toe end [0156] 28 Heel end [0157] 30 Upper [0158] 40 Linked bar mechanism [0159] 42 Heel bar [0160] 44 Forefoot bar [0161] 46 Last body pin [0162] 48 Linkage pin [0163] 50 Linkage slot [0164] 52 Heel body pin [0165] 54 Forefoot body pin [0166] 56 Heel bar slot [0167] 58 Forefoot bar slot [0168] 60 Guiding structure [0169] 62 Pin bore [0170] 70 Operator rod [0171] 72 Operator link [0172] A1 Movement of heel body part to open position [0173] A2 Movement of heel body part to operational position [0174] B1 Movement of forefoot body part to open position [0175] B2 Movement of forefoot body part to operational position [0176] D Girth at high instep [0177] H Girth from back of heel to instep [0178] TL Distance toe end to heel endlast without movable part [0179] TL1 Distance toe end to heel endlast with a movable heel only [0180] TL2 Distance toe end to heel endlast according to a present embodiment [0181] TLF Length of forefoot body part