EP0607285A1 - Protective bellows and method for making the same - Google Patents

Protective bellows and method for making the same

Info

Publication number
EP0607285A1
EP0607285A1 EP92921644A EP92921644A EP0607285A1 EP 0607285 A1 EP0607285 A1 EP 0607285A1 EP 92921644 A EP92921644 A EP 92921644A EP 92921644 A EP92921644 A EP 92921644A EP 0607285 A1 EP0607285 A1 EP 0607285A1
Authority
EP
European Patent Office
Prior art keywords
bellows
fold lines
blank
saw
blanks
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.)
Withdrawn
Application number
EP92921644A
Other languages
German (de)
French (fr)
Inventor
Lars Gottschalk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sydlader AB
Original Assignee
Sydlader AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sydlader AB filed Critical Sydlader AB
Publication of EP0607285A1 publication Critical patent/EP0607285A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/04—Bellows
    • F16J3/041—Non-metallic bellows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/08—Protective coverings for parts of machine tools; Splash guards
    • B23Q11/0816—Foldable coverings, e.g. bellows
    • 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
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force

Definitions

  • the present invention relates to a protective bellows and a method for making the same. More specifically, the invention concerns a protective bellows for enclosing mov ⁇ able parts of a tool, such as a scissors-type lifting table, and a method for making such a bellows.
  • Prior-art protective bellows have long been used for widely different purposes.
  • One important application concerns the enclosure of movable mechanical devices, such as the underframe of a scissors-type lifting table and piston and cylinder units in vehicles or workshop machinery, for protecting these devices from dirt and/or protecting the operator from injuries.
  • prior-art protective bellows are compos ⁇ ed of two or more layers of material, of which one has a stiffening function and the other or others serve to keep the bellows structure together so as to form the finished bellows.
  • stiffening elements in the form of springs or steel rings arranged in the folds of the bellows.
  • DE 12 51 650 which relates to a bellows composed of three layers of material.
  • One layer has a stiffening function and comprises four sheets which are interconnected at the upper and lower edges by a narrow strip of material, whereby to form a coherent piece.
  • Each sheet has slits extending across almost the entire sheet width. The slits constitute weakened portions where the material is folded when an inner and an outer layer of flexible material have been glued on to the stiffening layer.
  • the object of the present invention is to obviate the above drawbacks in the manufacture of the protective bellows, as well as those associated with the finished bellows.
  • Fig. 1 is a schematic perspective view from above of a bellows according to the invention
  • Fig. 2 is a schematic perspective view from below of the bellows in Fig. 1;
  • Fig. 3 is a schematic plan view of a blank forming part of the bellows in Fig. 1;
  • Fig. 4 is a schematic perspective view of the blank in Fig. 3 when folded together.
  • Fig. 5 is a schematic perspective view of two inter ⁇ connected blanks.
  • Fig. 1 shows a preferred embodiment of a bellows 1 according to the invention.
  • This bellows is designed to enclose the underframe of a scissors-type lifting table, and is composed of four sheet-like blanks 2 interconnected along the edges 3 of their long sides.
  • the resulting con- necting portions 4 thus constitute the corners of the bellows 1.
  • the blanks 2 consist of substantially rectangu ⁇ lar fabrics of a synthetic material, preferably PVC.
  • the edges 3 of the long sides of the blanks 2 have a saw-tooth shape, as shown in Fig. 5, which enables two blanks 2 that are interconnected along their long-side edges at an angle to fold.
  • the blanks 2 have a first set of fold lines 5, shown in Figs 3 and 5, extending between opposite crests 6 of the saw-tooth long-side edges 3, as well as a second set of fold lines 7 extending between opposite troughs 8 of the saw-tooth long-side edges 3.
  • the first set of fold lines 5 is provided on the inside of the blank, i.e. on the side that forms the inside of the bellows
  • the second set of fold lines 7 is provided on the outside of the blank.
  • the fold lines 5, 7, the blank 2 is divided into fold portions 9.
  • the fold lines 5, 7 make the material fold at precisely these lines and in a predetermined direction. Further, the fold lines impart stability to the material, resulting in pliable folding of the bellows 1.
  • the fold lines 5, 7 are provided by means of a high-frequency welding machine, but also other tools and methods may, of course, be used.
  • the bellows 1 is equip ⁇ ped with an upright circumferential flange 10 formed from an upper end portion 11 of each blank 2, the end portion 11 being twice as wide as a fold portion 9 and being fold ⁇ ed into the shape of a T turned upside-down.
  • the web of the end portion thus constitutes the flange, and the branches of the end portion are high-frequency welded to the fold portion 9 adjoining the end portion 11.
  • a circumferential channel 12 hav ⁇ ing openings 13 at each corner is provided at the lower end of the bellows 1.
  • the channel 12 is formed of the two lowermost fold portions 9 of each blank 2 by high-frequen- cy welding of the lower short-side edge 14 of the blank 2 to the lowermost but one fold portion 9.
  • Flat irons, for instance, are introduced in the channel 12 which, with its contents, is fixed to the floor.
  • the preferred embodiment of the bellows 1 according to the invention is manufactured as follows.
  • Each of the blanks 2 is provided with a first set of fold lines 5 on the inside, and a second set of fold lines 7 on the outside, as shown in
  • Fig. 3 In doing this, every other fold line 5 is provided on the inside and every other fold line 7 is provided on the outside by high-frequency welding, a positive elec ⁇ trode being placed on the side of the blank 2 where the fold line 5, 7 is to be provided, and a negative electrode being placed on the other side of the blank 2. High-fre ⁇ quency voltage is generated between the electrodes, and the material in the blank is heated and deformed so as to form a fold line 5, 7. Then, the blank 2 is folded along the fold lines 5, 7, resulting in a body 15, i.e. a folded blank, as shown in Fig. 4. The body 15 is cut at both ends at an angle of 45° to the short sides, as illustrated by the dashed lines in Fig.
  • the blank 2 is extended and now presents saw-tooth long- side edges 3, where the first set of fold lines 5 extend between opposite crests 6 of the saw-tooth long-side edges 3, and the second set of fold lines 7 extend between oppo ⁇ site troughs 8 of the saw-tooth long-side edges 3. All the blanks 2 are interconnected as shown in Fig. 5 so as to form a tubular unit, i.e. a bellows. The blanks then are arranged in pairs, applied against one another and inter ⁇ connected by high-frequency welding along one long-side edge 3. It goes without saying that various modifications of the inventive bellows and the inventive method are conceivable within the scope of the invention as defined i the appended claims.
  • the fold lines may be provided by any optional method.
  • PVC polyurethane or some other suitable material may be used, depending, inter alia, on the interconnecting technique.
  • the flange at the upper end of the bellows may be optionally positioned on the uppermost fold portion, e.g. at the outer or the inne periphery. Both the flange and the channel may be provide at one or both ends of each blank.
  • the blanks may have optional shape, such as triangular, ellipsoidal or irregular.
  • saw-tooth relates not only to the symmetrical shape in the illustrated embodiment, but also to any regular or irregular shape presenting crests and troughs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Diaphragms And Bellows (AREA)

Abstract

Soufflet de protection (1) conçu pour les parties mobiles d'un outil, telle qu'une table de levage articulée, et comprenant au moins trois ébauches en forme de feuille (2) reliées de façon à constituer un ensemble tubulaire. Les bords reliés (3) des ébauches (2) présentent une forme en dents de scie. Chaque ébauche (2) comporte un premier ensemble de lignes de pliage qui, sur l'un des côtés de l'ébauche (2), s'étendent entre les crètes opposées des bords en dents de scie (3), ainsi qu'un deuxième ensemble de lignes de pliage qui, de l'autre côté de l'ébauche (2), s'étendent entre les creux opposés des bords (3). Le soufflet (1) est fabriqué en matériau synthétique et les lignes de pliage sont réalisées par à haute fréquence. L'invention décrit également un procédé de fabrication du soufflet de protection (1).Protective bellows (1) designed for the moving parts of a tool, such as an articulated lifting table, and comprising at least three sheet-like blanks (2) connected so as to form a tubular assembly. The joined edges (3) of the blanks (2) have a sawtooth shape. Each blank (2) has a first set of fold lines which, on one side of the blank (2), extend between opposite crests of the serrated edges (3), and a second set of fold lines which, on the other side of the blank (2), extend between the opposite recesses of the edges (3). The bellows (1) is made of synthetic material and the folding lines are made by high frequency. The invention also describes a method of manufacturing the protective bellows (1).

Description

PROTECTIVE BELLOWS AND METHOD FOR MAKING THE SAME
The present invention relates to a protective bellows and a method for making the same. More specifically, the invention concerns a protective bellows for enclosing mov¬ able parts of a tool, such as a scissors-type lifting table, and a method for making such a bellows.
Protective bellows have long been used for widely different purposes. One important application concerns the enclosure of movable mechanical devices, such as the underframe of a scissors-type lifting table and piston and cylinder units in vehicles or workshop machinery, for protecting these devices from dirt and/or protecting the operator from injuries. In general, prior-art protective bellows are compos¬ ed of two or more layers of material, of which one has a stiffening function and the other or others serve to keep the bellows structure together so as to form the finished bellows. Alternatively, use is made of stiffening elements in the form of springs or steel rings arranged in the folds of the bellows. One instance of the prior art is disclosed in DE 12 51 650, which relates to a bellows composed of three layers of material. One layer has a stiffening function and comprises four sheets which are interconnected at the upper and lower edges by a narrow strip of material, whereby to form a coherent piece. Each sheet has slits extending across almost the entire sheet width. The slits constitute weakened portions where the material is folded when an inner and an outer layer of flexible material have been glued on to the stiffening layer.
The prior art suffers from several drawbacks. Using several layers of material is complicated, time-consuming as well as costly. Also, it involves a large consumption of material and many working operations. Since the sheets in the stiffening layer are only interconnected by two narrow strips, the finished bellows will have fairly weak corners, these being formed of but the flexible and compa¬ ratively thin layers.
The object of the present invention is to obviate the above drawbacks in the manufacture of the protective bellows, as well as those associated with the finished bellows.
This object is achieved by a bellows and a method for making the same having the features recited in the charac¬ terising clauses of, respectively, appended claim 1 and appended claim 5.
One thus obtains a protective bellows which differs from prior-art bellows by being much simpler, self-sup¬ porting without any additional stiffening -layers or stif¬ fening elements, as well as time- and cost-effective in terms of production, owing to a reduced number of working operations and a substantially enhanced economy of mate¬ rial. A further advantage is that the bellows according to the invention has essentially the same strength all over. The present invention will be described in more detail below with the aid of embodiments illustrated in the accompanying drawing, in which like reference numbers indicate like parts. In the drawings,
Fig. 1 is a schematic perspective view from above of a bellows according to the invention; Fig. 2 is a schematic perspective view from below of the bellows in Fig. 1;
Fig. 3 is a schematic plan view of a blank forming part of the bellows in Fig. 1;
Fig. 4 is a schematic perspective view of the blank in Fig. 3 when folded together; and
Fig. 5 is a schematic perspective view of two inter¬ connected blanks.
Fig. 1 shows a preferred embodiment of a bellows 1 according to the invention. This bellows is designed to enclose the underframe of a scissors-type lifting table, and is composed of four sheet-like blanks 2 interconnected along the edges 3 of their long sides. The resulting con- necting portions 4 thus constitute the corners of the bellows 1. The blanks 2 consist of substantially rectangu¬ lar fabrics of a synthetic material, preferably PVC. The edges 3 of the long sides of the blanks 2 have a saw-tooth shape, as shown in Fig. 5, which enables two blanks 2 that are interconnected along their long-side edges at an angle to fold. Further, the blanks 2 have a first set of fold lines 5, shown in Figs 3 and 5, extending between opposite crests 6 of the saw-tooth long-side edges 3, as well as a second set of fold lines 7 extending between opposite troughs 8 of the saw-tooth long-side edges 3. The first set of fold lines 5 is provided on the inside of the blank, i.e. on the side that forms the inside of the bellows, and the second set of fold lines 7 is provided on the outside of the blank. By the fold lines 5, 7, the blank 2 is divided into fold portions 9. Also, the fold lines 5, 7 make the material fold at precisely these lines and in a predetermined direction. Further, the fold lines impart stability to the material, resulting in pliable folding of the bellows 1. In the preferred embodiment, the fold lines 5, 7 are provided by means of a high-frequency welding machine, but also other tools and methods may, of course, be used. At the upper end, the bellows 1 is equip¬ ped with an upright circumferential flange 10 formed from an upper end portion 11 of each blank 2, the end portion 11 being twice as wide as a fold portion 9 and being fold¬ ed into the shape of a T turned upside-down. The web of the end portion thus constitutes the flange, and the branches of the end portion are high-frequency welded to the fold portion 9 adjoining the end portion 11. This gives both the flange 10 and the fold portion 9 a double thickness of material, which is of importance, since the flange 10 is fixed to a corresponding flange of the scis¬ sors-type lifting table and thus carries the entire weight of the bellows 1. As shown in Fig. 2, a circumferential channel 12 hav¬ ing openings 13 at each corner is provided at the lower end of the bellows 1. The channel 12 is formed of the two lowermost fold portions 9 of each blank 2 by high-frequen- cy welding of the lower short-side edge 14 of the blank 2 to the lowermost but one fold portion 9. Flat irons, for instance, are introduced in the channel 12 which, with its contents, is fixed to the floor.
The preferred embodiment of the bellows 1 according to the invention is manufactured as follows.
Four rectangular equally-sized blanks 2 are cut from a roll of fabric of a high-frequency weldable synthetic material, preferably PVC. Each of the blanks 2 is provided with a first set of fold lines 5 on the inside, and a second set of fold lines 7 on the outside, as shown in
Fig. 3. In doing this, every other fold line 5 is provided on the inside and every other fold line 7 is provided on the outside by high-frequency welding, a positive elec¬ trode being placed on the side of the blank 2 where the fold line 5, 7 is to be provided, and a negative electrode being placed on the other side of the blank 2. High-fre¬ quency voltage is generated between the electrodes, and the material in the blank is heated and deformed so as to form a fold line 5, 7. Then, the blank 2 is folded along the fold lines 5, 7, resulting in a body 15, i.e. a folded blank, as shown in Fig. 4. The body 15 is cut at both ends at an angle of 45° to the short sides, as illustrated by the dashed lines in Fig. 4, thereby forming a trapezium. The blank 2 is extended and now presents saw-tooth long- side edges 3, where the first set of fold lines 5 extend between opposite crests 6 of the saw-tooth long-side edges 3, and the second set of fold lines 7 extend between oppo¬ site troughs 8 of the saw-tooth long-side edges 3. All the blanks 2 are interconnected as shown in Fig. 5 so as to form a tubular unit, i.e. a bellows. The blanks then are arranged in pairs, applied against one another and inter¬ connected by high-frequency welding along one long-side edge 3. It goes without saying that various modifications of the inventive bellows and the inventive method are conceivable within the scope of the invention as defined i the appended claims. Thus, the fold lines may be provided by any optional method. Apart from PVC, polyurethane or some other suitable material may be used, depending, inter alia, on the interconnecting technique. The flange at the upper end of the bellows may be optionally positioned on the uppermost fold portion, e.g. at the outer or the inne periphery. Both the flange and the channel may be provide at one or both ends of each blank. Further, the blanks ma have optional shape, such as triangular, ellipsoidal or irregular. The term "saw-tooth" relates not only to the symmetrical shape in the illustrated embodiment, but also to any regular or irregular shape presenting crests and troughs.

Claims

1. A protective bellows (1) for movable parts of a tool, such as a scissors-type lifting table, said pro¬ tective bellows (1) comprising at least three sheet-like bellows blanks (2), each of which has two opposite saw¬ tooth edges (3), a first set of fold lines (5) extending between opposite crests (6) of the saw-tooth edges (3), and a second set of fold lines (7) extending between oppo¬ site troughs (8) of the saw-tooth edges (3), c h a r ¬ a c t e r i s e d in that the first set of fold lines (5) is provided on one side of the blank (2) and the second set of fold lines (7) is provided on the other side of the blank (2), that the blanks (2) are interconnected along their saw-tooth edges so as to form a tubular unit, that the blanks are made of a synthetic material, and that the fold lines (5, 7) are provided by high-frequency welding.
2. The protective bellows of claim 1, c h a r a c - t e r i s e d in that an end portion of each blank locat¬ ed between the last fold line and the terminal edge at one end of the blank is twice as wide as a portion located immediately inwardly thereof between two adjacent fold lines, that the end portion is folded and connected to said portion so as to form an upright flap, and that the flaps of the blanks together form a circumferential flange for connecting the bellows to the tool.
3. The protective bellows of any one of the preceding claims, c h a r a c t e r i s e d in that the terminal edge at said other end of each blank is folded back and connected to the blank so as to form a channel adapted to receive a fastening element for connecting the bellows to the tool or a base structure.
4. The protective bellows of any one of the preceding claims, c h a r a c t e r i s e d in that the synthetic material is PVC.
5. A method for making a protective bellows (1) for movable parts of a tool, such as a scissors-type lifting table, wherein two opposite edges (3) of each of at least three sheet-like bellows blanks (2) are given a saw-tooth shape, a first set of fold lines (5) being provided bet¬ ween opposite crests (6) of the saw-tooth edges (3), and a second set of fold lines (7) being provided between oppo¬ site troughs (8) of the saw-tooth edges (3), c h a r a c ¬ t e r i s e d by providing the first set of fold lines (7) on one side of the blank (2); providing the second set of fold lines (7) on the other side of the blank (2); inter¬ connecting the blanks (2) along their saw-tooth edges (3) so as to form a tubular unit; and heating and deforming the material by high-frequency welding, whereby to form the fold lines (5, 7).
EP92921644A 1991-10-10 1992-10-08 Protective bellows and method for making the same Withdrawn EP0607285A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9102927 1991-10-10
SE9102927A SE469192B (en) 1991-10-10 1991-10-10 SAFETY BELOW AND WERE MADE TO MANUFACTURE IT
PCT/SE1992/000706 WO1993007406A1 (en) 1991-10-10 1992-10-08 Protective bellows and method for making the same

Publications (1)

Publication Number Publication Date
EP0607285A1 true EP0607285A1 (en) 1994-07-27

Family

ID=20383951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92921644A Withdrawn EP0607285A1 (en) 1991-10-10 1992-10-08 Protective bellows and method for making the same

Country Status (4)

Country Link
EP (1) EP0607285A1 (en)
AU (1) AU2788392A (en)
SE (1) SE469192B (en)
WO (1) WO1993007406A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2806145B1 (en) * 2000-03-10 2002-06-07 Ge Med Sys Global Tech Co Llc JUNCTION DEVICE BETWEEN TWO HOODS HAVING RELATIVE MOBILITY, AND RADIOLOGY APPARATUS INCLUDING A DIGITAL DETECTOR SYSTEM PROVIDED WITH SUCH A JUNCTION DEVICE
US6986938B2 (en) 2001-10-03 2006-01-17 A & A Manufacturing Co., Inc. Bellows with molded panels
FR2966545B1 (en) * 2010-10-20 2013-07-19 Groupe Contino SAFETY BOTTOM OF LOWER SEAT
CN110757337B (en) * 2019-10-25 2021-05-07 太仓韬信信息科技有限公司 Cooling device is used in aluminum alloy production with hydrologic cycle function
CN112096999B (en) * 2020-08-19 2022-11-11 武汉东研装备科技有限公司 All-metal compensator for drying furnace
CN114952322B (en) * 2022-06-08 2024-02-02 扬州力创机床有限公司 High-precision high-reliability numerical control machine tool convenient for complex profile machining

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1251650B (en) * 1967-10-05
DE498330C (en) * 1930-05-21 August Nagel Dr Bellows for photographic apparatus
DE485172C (en) * 1928-03-16 1929-10-28 Carl Neithold A G Photographic bellows camera
DE3027083A1 (en) * 1980-07-17 1982-02-11 Möller Werke GmbH, 4800 Bielefeld Bellows or concertina-type cover - is for sliding tracks in machines and includes pleat collection lamellae, flexible parallel to retraction direction
DE3532702C2 (en) * 1985-09-13 1993-10-07 Arno Arnold Gmbh Bellows for covering machine parts

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9307406A1 *

Also Published As

Publication number Publication date
AU2788392A (en) 1993-05-03
SE9102927L (en) 1993-04-11
SE9102927D0 (en) 1991-10-10
WO1993007406A1 (en) 1993-04-15
SE469192B (en) 1993-05-24

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