WO2005090003A2 - Systemes de serrage - Google Patents

Systemes de serrage Download PDF

Info

Publication number
WO2005090003A2
WO2005090003A2 PCT/GB2005/001114 GB2005001114W WO2005090003A2 WO 2005090003 A2 WO2005090003 A2 WO 2005090003A2 GB 2005001114 W GB2005001114 W GB 2005001114W WO 2005090003 A2 WO2005090003 A2 WO 2005090003A2
Authority
WO
WIPO (PCT)
Prior art keywords
jaw
clamp according
support means
jaws
stud
Prior art date
Application number
PCT/GB2005/001114
Other languages
English (en)
Other versions
WO2005090003A3 (fr
Inventor
Roger Mansel Davies
Original Assignee
Roger Mansel Davies
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 Roger Mansel Davies filed Critical Roger Mansel Davies
Publication of WO2005090003A2 publication Critical patent/WO2005090003A2/fr
Publication of WO2005090003A3 publication Critical patent/WO2005090003A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/068—Arrangements for positively actuating jaws with at least one jaw sliding along a bar

Definitions

  • This invention relates to clamps, and in particular to clamps for clamping work pieces where the work piece may be expected to shrink or expand independently of work being performed on the work piece.
  • wood The most common material that is worked upon and that may be expected to shrink or expand to a degree significantly enough to affect the clamping of the work piece is wood. Other materials may, however exhibit the same properties as wood.
  • reference to wood in this document should be understood to refer to any material which may be expected to shrink or expand to a degree significantly enough to affect the clamping of the work piece.
  • a work piece is to be understood to refer to a piece of material which is to be worked upon. Such work may include, but not be limited to sculpture or carving. Such a work piece may be, but is not limited to, a log or a bulk of timber.
  • a clamp incorporating a pair of jaws which may be forced together by the rotation of a threaded bar is used to grip opposing sides of a work piece, normally at a position toward the vertically lowermost portion of the work piece.
  • the clamp fixed to a base so as to hold the work piece in position;
  • the work piece may be clamped between an upper jaw and a base plate when the upper jaw bears down on the work piece forcing the work piece against the base;
  • the work piece may be affixed to a base by known fixing means, such as wood screws or bolts.
  • the size of the work piece determines the size and quantity of the fixing means needed. All three methods have disadvantages, some of which may give rise to safety hazards. Methods i) and ii) are, in particular, hazardous when the work piece being clamped is dimensionally unstable. This is because if the work piece shrinks, wood for example shrinks when it dries, then the grip or pressure exerted by the clamps on the work piece lessens, possibly to nothing. If a worker does not rectify the lessening of the grip, that lessening may cause the workpiece to move whist being worked upon potentially damaging or harming the worker and/or the work piece. If the work piece expands then the result may be excessive compression of the work piece and/or excessive tension in the clamp mechanism which can lead to damage to the workpiece and/or the clamp mechanism.
  • Method iii) generally results in the work piece including within it screws or other fixing means where a worker cannot see them whilst he is working on the work piece. This has the result that a worker may strike the screw or other fixing means embedded in the work piece with a tool by accident. This may result in damage to the tool and/or the worker. This is particularly likely if a power tool is being used.
  • a clamp suitable for gripping a work piece comprising at least two jaws and a jaw support means, in which each jaw has a grip face and at least one of the jaws is provided with an actuation means adapted to move the jaw relative to the otherjaw or jaws and in which the actuation means is comprised of at least one elastically extensible tension element which when releasing tension stored therein impels the movable jaw with which it is associated in a direction that decreases the distance between the grip face of that movable jaw and the grip face of at least one of the other jaws.
  • the present invention is particularly advantageous over known clamps because when in use, the tension element of the actuation means is placed under tension and, in an attempt to return to a non-tensioned or relaxed state, the tension element will cause the jaw with which it is associated to move toward the otherjaw or jaws if that jaw is not prevented from doing so.
  • the movable jaw will continue to be impelled toward the other jaws until all of the tension / stored energy in the tension element is released, or until the jaw is prevented from further movement. If the work piece is the object blocking further movement of the movable jaw, that jaw will exert pressure on the work piece. That pressure will push the work piece towards the other jaw or jaws, and, once the work piece is pushed against the otherjaw or jaws result in the jaws gripping the workpiece.
  • the remaining tension in the tension element, or any further tension that is introduced into the tension element is stored in the element the elastic deformation of the material of the tension element, in particular in the stretching of the tension element.
  • the stored tension or stored energy in the tension element has the effect that if the work piece gripped by the jaws becomes dimensionally smaller, or shrinks, the attempt by the tension element to release that energy will impel the movable jaw towards the other jaws so maintaining the grip on the work piece. Conversely, if the work piece gripped by the jaws becomes dimensionally larger, or expands, the work piece will force the or each movable jaw away from the other jaws.
  • the tension element in the or each actuation means will resist the movement of the or each jaw, but will, when the force exerted by the work piece becomes sufficient, allow such movement by elastically deforming, as a result of an increase of the tension in the tension element.
  • the material or materials of which the tension element is comprised may be selected so as either to determine the distance the jaw associated with the tension element will move when releasing a predetermined tension in the tension element, or to match the magnitude of the expected shrinkage or expansion of the work piece.
  • the tension element is of a longitudinally extending shape.
  • the tension element is a length of a flexible material such as rope, cord, or a tape.
  • the actuation means may be so constructed that the tension element is anchored to a movable jaw at a first end, and the second end is anchored to or passes through a tensioning means wherein the tensioning means, when operated, pulls the tension element in a direction that causes the movable jaw to move toward the otherjaw or jaws.
  • the tensioning means when operated, pulls the tension element in a direction that causes the movable jaw to move toward the otherjaw or jaws.
  • the tension element is deployed in the actuation means in a serpentine configuration.
  • the tension element passes around one or more pullies or bars so that the orientation of the principle axis of the tension element is not consistent along the length of the tension element.
  • the actuation means may be of a substantially longitudinal configuration with the tensioning means located in such a position that the movable jaw moves away from the tensioning means when that jaw moves toward the otherjaw or jaws.
  • the tensioning means is a rachet tensioner, or at least includes a rack and pawl or a rachet mechanism.
  • Other known methods of tensioning or pulling ropes, cords or tapes may be employed as the tensioning means if so desired.
  • the jaw support means is rigid and supports all of the jaws in a substantially single plane.
  • the jaw support means is substantially "y" shaped when viewed from a direction perpendicular to its principle plane.
  • each arm of the Y supports a jaw.
  • the jaw support means may be a substantially planer plate.
  • the or each movable jaw is associated with an elongate slot in the jaw support means.
  • Each movable jaw is loosely retained in its associated elongate slot, and the actuation means associated with the jaw may cause the jaw to move along the slot.
  • the actuation means is fixed to the jaw support means or to a structural member which is itself, fixed to the jaw support means.
  • At least one of the jaws is a fixed jaw which is releaseably engagable with the jaw support means and, by virtue of it's engagement with the jaw support means, fixed in a position relative to the jaw support means.
  • the fixing prevents movement of the jaw along the plane occupied by the jaws of the clamp- in the present invention.
  • the engagement means does not prevent the or each fixed jaw being moved out of the plane occupied by the jaws in a direction substantially parallel to that plane.
  • the jaw support means is provided with a plurality of positions at which or with which the or each fixed jaw may be engaged. This has the particular advantage that the positioning of the fixed jaw or jaws on the jaw support means can be optimised for the shape of the workpiece to be clamped.
  • the means for engaging the or each fixed jaw with the jaw support means may be studs and index holes located on the fixed jaw and the jaw support means or vice versa.
  • the index hole may be round, or of a shape suitable for allowing the insertion of the stud at a particular position in the index hole and preventing withdrawal of the stud from the index hole at other positions in the index hole. In such configurations, it may be the case that the index hole is narrower in one or more dimensions at some parts of the mouth of the index hole than it is further away from the surface which defines the mouth of the index hole.
  • the stud may be appropriately configured so as to enable a portion of the stud adjacent to the body from which the stud projects to pass through the dimensionally smaller area of the index hole.
  • the stud is most preferably integral with the jaw and the index holes defined by the jaw support means.
  • a work piece is placed on the jaw support means and the or each fixed jaw located on the jaw support means so as to engage or nearly engage with a portion of the work piece.
  • the or each movable jaw is/are then forced to move towards the work piece by it's or their associated actuation means which is being actuated by operation of the tensioning means by a worker.
  • the tensioning means which introduces tension into the tension element. That tension is stored by way of elongation/elastic deformation of the tension element.
  • the work piece can then be worked upon by a worker.
  • the tension stored in the or each tension element will cause the or each moveable jaw to move towards the work piece exerting a substantially continuous or only slowly decreasing pressure. If the workpiece expands, the moveable jaw or jaws will be pushed backwards and the tension in or each the tension element will increase.
  • the tension in the tensioning element may be released by disengaging or reversing the operation of the tensioning means.
  • the moveable jaw or jaws may then be pulled away from the work piece so allowing the work piece to be removed.
  • Figure 1 shows a view of an embodiment of a clamp according to the present invention.
  • Figure 2 shows a schematic sectional view of a portion of the clamp of Figure 1.
  • a clamp (2) is comprised of a jaw support (4) supported on legs (6).
  • Jaw support (4) supports three jaws (8,10,12).
  • Jaw support (2) is of a substantial Y shape having three arms (14, 16, 18) extending from a central junction. Two of the anus (14, 16) are substantially the same as each other and include, in their uppermost, (when the clamp for the present invention is in use), surface a plurality of index holes (20). Rigidly fixed to the free end of each of the arms (14, 16) is the leg (6) associated with that arm.
  • Arm (18) is provided, on it's uppermost (when the clamp in the present invention is in use) surface, with a slot (22) extending longitudinally along the arm (18).
  • the Slot (22) is, for the majority of it's length, parallel sided.
  • a leg (6) is rigidly afixed to the free end of the arm (18).
  • Jaw (12) supported on the arm (18) supported on the arm (18) is a moveable jaw and is so configured and dimensioned that it may slide along the slot (22).
  • the jaw (12) includes a grip face (26) an upper flange (28) and a lower flange (30).
  • Upper and lower flanges (28, 30) are so dimensioned and configured that they prevent the jaw (12) moving in a direction substantially perpendicular to the plane occupied by the arms (14, 16, 18).
  • the lower flange (30) is also so dimensioned and configured that it may pass through aperture (24) at the end of the slot (18). This allows either the replacement of the jaw or servicing of the jaw should this prove necessary.
  • the moveable jaw (12) may be caused to move along the slot (12) in a right to left direction as shown in the figure, that is toward the grip faces of jaws (8 & 10) by being pulled by tape (32).
  • Tape (32) has a first end (34) anchored onto the lower flange (30) of the jaw (12). The tape then passes around a first post (36) and then around a second post (38) so that the tape is direted to a tensioning means (40).
  • the tensioning means (40) is most preferably a rachet tensioner of a known construction.
  • the first and second posts (36, 38) may either be fixed posts with at least one end rigidly fixed to the arm (18).
  • first and second posts (36, 38) may be comprised of an axle and bearing or pulley so that the tape (32) may pass smoothly around the posts.
  • Post (36) is located at a position at least as far from the free end of arm (18) as the end of slot (22) distal from that free end.
  • a log (42) shown in dashed lines on Figure 1 is placed on the jaw support means (4) and the fixed jaws (8, 10) engaged with appropriate index holes (20) via studs (not shown) so as to be adjacent to or engaged with log (42).
  • Jaw (12) has, in the meantime, been pulled back toward the free end of the arm (18) so as to be out of the way of log (42).
  • tensioning means (40) is used to pull the tape (32) causing jaw (12) to travel along the slot (22) towards the log (42).
  • grip face (26) of the jaw (12) engages with the log (42) the worker continues to operate the tensioning means (40) so bringing grip face (26) into pressured contact with the log (42) and, subsequently, introduces tension into the tape (32) causing the tape to stretch. If the log (42) expands then the jaw (12) is pushed in a left to right direction (as shown in Figure 2) causing an increase in the tension in tape (32). If the log (42) shrinks, the tape (32) seeks to release tension by becoming shorter so moving jaw (12) in a right to left direction (as shown in Figure 2) thus maintaining the grip of grip face (26) on log (42).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)

Abstract

L'invention a pour but de solutionner les problèmes relatifs à des objets rigides, ou semi-rigides, qui deviennent lâches lorsqu'ils sont maintenus par un système de serrage. En remplaçant la vis sans fin conventionnelle par un composant flexible, sous tension, capable de transmettre une force considérable (si nécessaire, suivant une trajectoire en serpentin) et de stocker une énergie cinétique, le serrage peut être capable de maintenir une prise dans un certain nombre de situations défavorables. Lorsque l'objet se contracte ou se dilate, sous l'effet de variations d'humidité, de température, ou d'autres facteurs modifiant les dimensions, le système maintient alors une pression de serrage cohérente. Des moyens conventionnels fournissant une tension sont utilisés comme représenté par l'objet (40) à la figure 1, le serrage se faisant horizontalement sur un banc de travail. La nouveauté consiste à incorporer l'élément élastique dans les systèmes de serrage et à diriger les forces de façon requise. Le système de serrage peut être aligné en toute position avec le dispositif de tension positionné en vue d'obtenir la faisabilité optimale.
PCT/GB2005/001114 2004-03-14 2005-03-14 Systemes de serrage WO2005090003A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0405687.5 2004-03-14
GB0405687A GB0405687D0 (en) 2004-03-14 2004-03-14 Clamps

Publications (2)

Publication Number Publication Date
WO2005090003A2 true WO2005090003A2 (fr) 2005-09-29
WO2005090003A3 WO2005090003A3 (fr) 2006-01-12

Family

ID=32117624

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/001114 WO2005090003A2 (fr) 2004-03-14 2005-03-14 Systemes de serrage

Country Status (2)

Country Link
GB (1) GB0405687D0 (fr)
WO (1) WO2005090003A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105181282A (zh) * 2015-09-15 2015-12-23 芜湖赛宝信息产业技术研究院有限公司 一种可自由定位的振动试验夹具
CN116008072A (zh) * 2022-12-13 2023-04-25 北京京能建设集团有限公司 一种钢筋混凝土梁测试装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3080162A (en) * 1960-02-16 1963-03-05 Smith Arthur Sam Mitered casing clamp
GB2286987A (en) * 1994-03-04 1995-09-06 Douglas Lacey Single handed slide bar clamp
DE19519797A1 (de) * 1995-05-30 1996-12-05 Ntt Neuhaus Trans Tech Gmbh Teleskopische Vorrichtung, insbesondere Spreiz- bzw. Stützvorrichtung oder Einspannvorrichtung
US5892344A (en) * 1996-04-29 1999-04-06 Cooley; James Police doorpost clamp

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3080162A (en) * 1960-02-16 1963-03-05 Smith Arthur Sam Mitered casing clamp
GB2286987A (en) * 1994-03-04 1995-09-06 Douglas Lacey Single handed slide bar clamp
DE19519797A1 (de) * 1995-05-30 1996-12-05 Ntt Neuhaus Trans Tech Gmbh Teleskopische Vorrichtung, insbesondere Spreiz- bzw. Stützvorrichtung oder Einspannvorrichtung
US5892344A (en) * 1996-04-29 1999-04-06 Cooley; James Police doorpost clamp

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105181282A (zh) * 2015-09-15 2015-12-23 芜湖赛宝信息产业技术研究院有限公司 一种可自由定位的振动试验夹具
CN105181282B (zh) * 2015-09-15 2017-11-28 芜湖赛宝信息产业技术研究院有限公司 一种可自由定位的振动试验夹具
CN116008072A (zh) * 2022-12-13 2023-04-25 北京京能建设集团有限公司 一种钢筋混凝土梁测试装置
CN116008072B (zh) * 2022-12-13 2024-01-26 北京京能建设集团有限公司 一种钢筋混凝土梁测试装置

Also Published As

Publication number Publication date
WO2005090003A3 (fr) 2006-01-12
GB0405687D0 (en) 2004-04-21

Similar Documents

Publication Publication Date Title
US7290761B2 (en) Multi-purpose flexible jaw universal vise with removable clamp feature
US6338475B1 (en) Bar clamp
US4893801A (en) Clamp
US5265854A (en) Self-powered bar clamp
EP1838180B1 (fr) Systemes de support pour bicyclettes sûrs, a fixation et a liberation rapides
US6746006B2 (en) Compression and expansion tool
US20090121405A1 (en) Clamping device
US7665718B1 (en) Hose fitting inserter
US20080296821A1 (en) Quick release electronics platform
MXPA03001865A (es) Aparato para sujetar una pieza de trabajo.
US4627604A (en) Adjustable clamp
CA2504089A1 (fr) Serre-joint a barre
US7325271B2 (en) Clamp device for removably attaching a vacuum cleaner component to a structure
US20190091847A1 (en) Fastener holder
WO2005090003A2 (fr) Systemes de serrage
US4449704A (en) Reversible vernier vises, clamps, and force tools
US20030010570A1 (en) Device for storage of a tool
US20060164737A1 (en) Highly Versatile Optical Element Mount
WO1996020813A1 (fr) Dispositif de blocage
US6370836B1 (en) Floor board compression apparatus
US4296922A (en) Bench clamp device
US4932641A (en) Variable force exerting clamp assembly having a variable clamping area
GB2488747A (en) Floor mounted door clamp
CN117108088B (zh) 一种钢结构工程施工用防坠装置
US4861009A (en) Variable force exerting clamp assembly having a variable clamping area

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase in:

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

122 Ep: pct application non-entry in european phase