EP2463226A1 - Telescopic fork - Google Patents
Telescopic fork Download PDFInfo
- Publication number
- EP2463226A1 EP2463226A1 EP11192272A EP11192272A EP2463226A1 EP 2463226 A1 EP2463226 A1 EP 2463226A1 EP 11192272 A EP11192272 A EP 11192272A EP 11192272 A EP11192272 A EP 11192272A EP 2463226 A1 EP2463226 A1 EP 2463226A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flanges
- telescopic fork
- slide
- optical device
- opening
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 26
- 230000033001 locomotion Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/12—Platforms; Forks; Other load supporting or gripping members
- B66F9/14—Platforms; Forks; Other load supporting or gripping members laterally movable, e.g. swingable, for slewing or transverse movements
- B66F9/141—Platforms; Forks; Other load supporting or gripping members laterally movable, e.g. swingable, for slewing or transverse movements with shuttle-type movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/12—Platforms; Forks; Other load supporting or gripping members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Warehouses Or Storage Devices (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
- The present invention relates to a telescopic fork. Telescopic forks are used in the fields of automatic manipulation and industrial automation, and are widely applied, for example, in automated warehouses, typically in association with automated lift trucks for moving pallets.
- As is known, a telescopic fork is composed of a fixed lower base and one or more overlapping extendable elements which move in a bilateral telescopic manner for the movement of loads. The number of mobile telescopic elements (two, three or four) is chosen to suit the desired overall length of travel and the size of the loads to be handled.
- To assist the understanding of the prior art and its inherent problems, a known type of telescopic fork, shown in
Figure 2 of the attached drawings, will be described initially. The fork includes a lowerfixed base 10 having two verticalcentral flanges rollers 13 with horizontal axes. Therollers 13 support, in a telescopically slidable manner, an intermediate slide or travellingelement 20. By means of a second set ofrollers 14, the intermediate slide supports, in a telescopically slidable manner, a top slide or travellingelement 30 which can directly support the loads to be transferred when in use. - The ends of two chains 27 (only one of which is shown in
Figure 2 ) are fixed to theflanges top slide 30 the longitudinal sliding motion which is imparted to theintermediate slide 20 by a rack and pinion drive mechanism. This mechanism includes a rotating gear wheel (not shown) carried on thelower base 10 and alongitudinal rack 25 which runs centrally along the whole length of the bottom of theintermediate slide 20 between theflanges chains 27 are guided byparallel grooves intermediate slide 20. - In order to control the position of the slides, many conventional forks are provided with control systems having mechanical or inductive end of stroke switches D mounted outside the body of the fork. This external location makes these end of stroke switches particularly vulnerable during the use of the fork, and increases the overall transverse horizontal dimension of the fork by about 5 to 10 cm.
- The object of the invention is to optimize the available space in a telescopic fork, and, in particular, to place an optical control unit in a protected position for the purpose of controlling the position of the top slide.
- These and other objects and advantages, which are made clearer below, are achieved according to the present invention by a telescopic fork having the characteristics defined in the attached claims.
- A preferred, but non-limiting, embodiment of the telescopic fork according to the invention will now be described; reference will be made to the attached drawings, in which:
-
Figure 1 is a cross-sectional view of a telescopic fork according to one embodiment of the invention; and -
Figure 2 is a cross-sectional view of a conventional telescopic fork. - With reference to
Figure 1 , a preferred embodiment of a telescopic fork according to the invention includes alower base 10, anintermediate slide 20 which is telescopically mobile with respect to thebase 10, and a top platform orslide 30, which in turn is telescopically mobile with respect to theintermediate slide 20. - The
lower base 10 has a lowerhorizontal plate 16 from which a pair of verticallateral flanges base 10 is approximately in the form of an inverted π symbol. The overall structure of the fork is symmetrical with respect to the vertical mid-plane P. Throughout the following description and claims, terms and expressions indicating relative orientations and positions such as "longitudinal", "transverse", "outer", and "inner" are to be interpreted relatively to the central vertical plane P and to the "longitudinal" direction of the telescopic motion of the fork, which is perpendicular to the plane of the drawing inFigure 1 . - The
flanges base plate 16 symmetrically with respect to the mid-plane P, in intermediate positions between the plane P and the respective opposite longitudinal sides orlongitudinal edges plate 16. More specifically, theflanges edges Figure 1 , theflanges horizontal plate 17, preferably formed by a horizontal plate portion which is made in one piece with theflanges - A first set of
rollers 13 with horizontal axes is mounted in positions transversely outside theflanges intermediate slide 20 in a telescopically slidable way on thebase 10. Therollers 13 engage in a rolling manner in two guides in the form of laterallongitudinal cavities 21 in theintermediate slide 20. Thecavities 21 face the mid-plane P. The intermediate slide has a second pair of laterallongitudinal cavities 22, facing in opposite, transversely outer, directions. The rollers of a second set ofrollers 14, projecting from respective vertical transverselyouter flanges top slide 30, engage in a rolling manner in thecavities 22, in a general configuration of a known type. - The
intermediate slide 20 includes a flattenedcentral portion 24 in the form of a horizontal plate which extends in a bridge-like manner above theflanges opening 23, in the form of a longitudinally elongate slot, is formed in the proximity of one of the longitudinal ends of theintermediate slide 20, in the central area. Alongitudinal rack 25 runs centrally along the whole length of the bottom of theintermediate slide 20, projecting from the lower face of thecentral portion 24 of theslide 20. - Parallel
longitudinal grooves intermediate slide 20, and act as guides for respective chains (not shown) forming part of a transmission mechanism which transfers to thetop slide 30 the sliding motion imparted to theintermediate slide 20 by the rack mechanism. Each of these chains has one end fixed to thelower base 10 and a second end fixed to thetop slide 30. - The chain transmission mechanism in the fork according to the present invention is located nearer the mid-plane P than it is in the known fork shown in
Figure 2 . Thevertical flanges Figure 1 , thechain guiding grooves flanges base 10. - The aforesaid configuration enables an optical control unit to be placed in a protected position near the centre of the fork, for directly controlling the position of the top slide. The greater transverse distance between the
flanges lateral flanges flanges lower base 10 in a laterally protected position between theflanges rack 25 and theflanges top slide 30, can be read directly by the photocell F when theopening 23 is aligned between the reflector C and the photocell F. The photocell F, theopening 23 and the reflector C are located in the same plane, preferably a vertical plane. In the illustrated embodiment, the two optical devices F, C and theopening 23 are aligned along the same ideal straight line when the fork reaches a specified working position, for example the fully retracted end of stroke position. - It will be evident that the optical system is protected from impact and does not increase the overall dimensions. Although the
rack 25 extends along the whole length of the intermediate slide, it does not impede the passage of the light rays R emitted by the photocell F and reflected by the reflector C. It should be noted that theplate 17 is optional, and that, if present, it is fixed to the photocell F and must have a throughhole 18 or other opening such that the rays R are not blocked. In the illustrated embodiment, thehole 18 is vertically aligned with the photocell F. It will be understood that the vertical direction of the rays R is not essential. The invention can be applied equally satisfactorily by directing the rays R in an inclined manner with respect to the vertical, and by inclining the reflector C in a corresponding manner if necessary. A relative advantage of the use of a reflector is that it diffuses the reflection towards the receiver in an effective manner without requiring a condition of absolute verticality. If the rays R are inclined with respect to the mid-plane P, the opening 23 in the intermediate slide will be designed or placed in a position such that the passage of the emitted ray and the reflected ray is permitted in a specified position of the fork, typically in the end of stroke position in which the fork is fully retracted. - The invention is not necessarily limited to an optical device F comprising a single photocell acting as transmitter and receiver. In other embodiments of the invention, which are not illustrated and which are less preferred, the incident ray and the reflected ray can form an acute angle between them in a plane confined laterally between one of the vertical planes (P11 or P12) in which one of the flanges 11 (or 12) lies and the side of the rack facing the flange in question. In this variant, a transmitting optical device and a separate receiving optical device are provided; the
opening 23 is in all cases designed so as to permit the passage of both the incident ray and the reflected ray in the end of stroke position. Alternatively, there can be two openings in the intermediate slide, one for the incident ray and one for the reflected ray. Additionally, in the embodiment shown inFigure 1 , which has a single transmitting and receiving optical device F, it is preferable for theopening 23 to be in the form of a slot, in other words slightly elongate in the longitudinal direction, in order to allow for the mechanical play between the slides in the longitudinal direction. - It is to be understood that the invention is not limited to the embodiment described and illustrated herein, which is to be considered as an example; in fact, the invention can be modified in respect of shape, dimensions, arrangements of parts, details of construction, and operation. For example, the option of providing a fork with only two mobile slides may be preferred in certain conditions of use, but it is not in any way essential for the purposes of the application of the invention. In particular, the invention can be applied in the form of a fork including three or more mobile slides. In these variants, the intermediate slides between the top slide and the base must have openings such that the passage of the emitted ray and of the reflected ray is permitted in a specified position of the fork, typically in the end of stroke position when the fork is fully retracted.
Claims (13)
- Telescopic fork including a lower base (10) and a plurality of mobile slides or telescopically extendable elements (20, 30), wherein each slide (20, 30) is slidable by means of a respective set of rollers (13, 14) arranged symmetrically with respect to a vertical plane of symmetry (P), and wherein
the base (10) has a pair of parallel vertical flanges (11, 12) extending upwardly in respective vertical planes (P11, P12) from a base plate (16), the flanges holding a set of rollers (13) located transversely outside the flanges (11, 12) for supporting an intermediate slide (20) in sliding manner with respect to the base (10), and wherein
the intermediate slide (20) has longitudinal grooves (26a, 26b) which serve as guides for chains for transmitting a longitudinal sliding motion to a top slide (30); characterized in that- the chain guiding grooves (26a, 26b) are formed in transversely intermediate positions between the vertical planes (P11) and (P12) in which the flanges (11, 12) of the base (10) extend, and in that- at least a first optical device (F) is fixed to the lower base (10) in a transversely intermediate position between the flanges (11) and (12);- a second optical device (C) is fixed to a lower surface of the top slide (30);- at least one opening (23) is formed in the intermediate slide or slides (20) between the top slide (30) and the lower base (10), whereby the opening (23) is aligned between the first (F) and second (C) optical devices in at least one working position of the fork. - Telescopic fork according to Claim 1, characterized in that it further comprises a rack (25) which extends substantially over the entire length of the intermediate slide (20), and in that the optical devices (F, C) and the opening (23) are transversely or laterally confined between an ideal vertical plane (P12) in which one (12) of the flanges extends (11, 12) and another ideal vertical plane in which the side of the rack (25) facing and closest to this flange (12) extends.
- Telescopic fork according to Claim 1 or 2, characterized in that the opening (23) is longitudinally elongate.
- Telescopic fork according to Claim 1 or 2 or 3, characterized in that the opening (23) is formed in a central portion (24) extending in bridge-like manner above the flanges (11, 12).
- Telescopic fork according to any one of the preceding claims, characterized in that in the working position of the fork the opening (23), the first (F) and the second (C) optical devices are aligned in a vertical plane.
- Telescopic fork according to Claim 5, characterized in that in the working position of the fork the opening (23), the first (F) and the second (C) optical devices are aligned along a vertical straight line.
- Telescopic fork according to any one of the preceding claims, characterized in that the flanges (11, 12) are arranged symmetrically with respect to the plane (P) at transversely intermediate positions between the mid-plane (P) and the opposite longitudinal edges (16a, 16b) of the base plate (16).
- Telescopic fork according to any one of the preceding claims, characterized in that the flanges (11, 12) are rigidly connected to one another by a horizontal plate portion (17) which is located above the first optical device (F) and has a through opening or hole (18) substantially aligned vertically above the optical device (F).
- Telescopic fork according to any one of the preceding claims, characterized in that the first optical device (F) is an optical transmitter/receiver, such as a photocell.
- Telescopic fork according to any one of the preceding claims, characterized in that the first optical device (F) is mounted at one of the longitudinal ends of the lower base (10).
- Telescopic fork according to any one of the preceding claims, characterized in that the second optical device (C) comprises a reflective element such as a reflector.
- Telescopic fork according to any one of the preceding claims, characterized in that the second optical device (C) is located at one of the longitudinal ends of the top slide (30).
- Telescopic fork according to any one of the preceding claims, characterized in that the working position of the fork is an end of stroke position when the fork is telescopically retracted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO2010A000985A IT1403012B1 (en) | 2010-12-10 | 2010-12-10 | TELESCOPIC FORK |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2463226A1 true EP2463226A1 (en) | 2012-06-13 |
EP2463226B1 EP2463226B1 (en) | 2014-03-19 |
Family
ID=43737377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11192272.0A Active EP2463226B1 (en) | 2010-12-10 | 2011-12-07 | Telescopic fork |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2463226B1 (en) |
KR (1) | KR101780826B1 (en) |
CN (1) | CN102556902B (en) |
IT (1) | IT1403012B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUA20163972A1 (en) * | 2016-05-31 | 2017-12-01 | Eurofork S R L | Telescopic fork. |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103991822B (en) * | 2014-06-10 | 2016-04-06 | 山西东杰智能物流装备股份有限公司 | Can pinpoint telescopic light-duty pallet fork |
CN104310281B (en) * | 2014-08-28 | 2016-09-14 | 缪慰时 | Internal combustion drives large-tonnage hydrostatic four-way fork truck |
IT202200010787A1 (en) | 2022-05-24 | 2023-11-24 | Eurofork S P A | Telescopic fork |
IT202200010799A1 (en) | 2022-05-24 | 2023-11-24 | Eurofork S P A | Pair of telescopic forks |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1527570A (en) * | 1967-06-16 | 1968-05-31 | Demag Zug Gmbh | Stacking device with telescopic platform expandable on both sides or on one side |
GB1383185A (en) * | 1972-07-11 | 1975-02-05 | Bygg Och Transportekonomie Ab | Side loading fork unit for lift trucks |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD102367A1 (en) * | 1973-03-12 | 1973-12-12 | ||
JP4674080B2 (en) | 2004-12-14 | 2011-04-20 | 株式会社ダイフク | Sliding fork device |
CN101885456B (en) | 2010-06-24 | 2013-05-22 | 西安航天动力机械厂 | Telescopic fork |
-
2010
- 2010-12-10 IT ITTO2010A000985A patent/IT1403012B1/en active
-
2011
- 2011-11-18 KR KR1020110120685A patent/KR101780826B1/en active IP Right Grant
- 2011-12-07 EP EP11192272.0A patent/EP2463226B1/en active Active
- 2011-12-08 CN CN201110407524.9A patent/CN102556902B/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1527570A (en) * | 1967-06-16 | 1968-05-31 | Demag Zug Gmbh | Stacking device with telescopic platform expandable on both sides or on one side |
GB1383185A (en) * | 1972-07-11 | 1975-02-05 | Bygg Och Transportekonomie Ab | Side loading fork unit for lift trucks |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUA20163972A1 (en) * | 2016-05-31 | 2017-12-01 | Eurofork S R L | Telescopic fork. |
Also Published As
Publication number | Publication date |
---|---|
KR20120065227A (en) | 2012-06-20 |
CN102556902B (en) | 2016-01-20 |
KR101780826B1 (en) | 2017-09-21 |
CN102556902A (en) | 2012-07-11 |
IT1403012B1 (en) | 2013-09-27 |
ITTO20100985A1 (en) | 2012-06-11 |
EP2463226B1 (en) | 2014-03-19 |
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