EP0354644A2 - Mécanisme de vissage et étau - Google Patents

Mécanisme de vissage et étau Download PDF

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Publication number
EP0354644A2
EP0354644A2 EP89305364A EP89305364A EP0354644A2 EP 0354644 A2 EP0354644 A2 EP 0354644A2 EP 89305364 A EP89305364 A EP 89305364A EP 89305364 A EP89305364 A EP 89305364A EP 0354644 A2 EP0354644 A2 EP 0354644A2
Authority
EP
European Patent Office
Prior art keywords
screw
nut seat
cam
threads
drive mechanism
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
Application number
EP89305364A
Other languages
German (de)
English (en)
Other versions
EP0354644A3 (fr
EP0354644B1 (fr
Inventor
Chaolai Fan
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.)
Individual
Original Assignee
Individual
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
Priority claimed from CN 88104905 external-priority patent/CN1016524B/zh
Priority claimed from CN 88106661 external-priority patent/CN1011158B/zh
Application filed by Individual filed Critical Individual
Publication of EP0354644A2 publication Critical patent/EP0354644A2/fr
Publication of EP0354644A3 publication Critical patent/EP0354644A3/fr
Application granted granted Critical
Publication of EP0354644B1 publication Critical patent/EP0354644B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B25B1/00—Vices
    • B25B1/06—Arrangements for positively actuating jaws
    • B25B1/10—Arrangements for positively actuating jaws using screws
    • B25B1/12—Arrangements for positively actuating jaws using screws with provision for disengagement
    • B25B1/125—Arrangements for positively actuating jaws using screws with provision for disengagement with one screw perpendicular to the jaw faces

Definitions

  • the present invention relates to a novel screw drive mechanism which permits the screw fast to engage with or disengage from a screw nut by a relative movement between the screw and the nut, which can be widely used in manual bench vice, bench vice for a tool or sliding table of a tool where there are requirements for quickly passing over an idle stroke, speedily adjusting a relative distance or fast clamping.
  • the U.S. patent No. 2102602 (1937) disclosed a mechanism which the locus of center of the screw is an arc when the screw disengages or engages to the nut. Thus, the nut has to slidablly connect with a stationary body, which would render a poor strength.
  • the U.S. patent No. 2430458 (1947) also discloses a mechanism in which the screw nut will still remain on the screw after the later has disengaged from the former and where the screw nut bears against to an outer circumference of the screw by a spring and a pin, which will bring a too great resistance.
  • the present applicant submitted a patent application to the European Patent Office (No. 88301613; See Fig. 1) which disclosed a fast clamping mechanism, in which a driving nut is provided outside the vice body, and the mechanism is complex in construction.
  • An object of the present invention is to overcome the aforesaid drawbacks by employing a oneway pawl and cam mechanism to effect straight-line relative movement between the screw and the nut so that the screw engaging with or disengaging from the screw nut.
  • a oneway pawl and cam mechanism to effect straight-line relative movement between the screw and the nut so that the screw engaging with or disengaging from the screw nut.
  • it is simple in construction and is low in cost.
  • a mechanism comprises a movable sliding body, a stationary body, a screw, a screw nut seat, a eccentric cam, a oneway pawl device, the springs and a positioning pin. etc, where the screw passes through the cam and the screw nut seat.
  • the two ends of the screw are supported in two long-­circular holes in two end walls of the movable sliding body respectively, the oneway pawl device adopts a ratchet sleeve, which is positioned between the eccentric cam and a arm of the screw nut seat and connects with screw through a quide key.
  • the sleeve is beared against on an end surface of the cam by a spring. Under the action of cam, the screw vertically moves relative to the secured nut seat.
  • the oneway pawl device adopts a pawl pin, which is located within a radial hole on the cam and pulled by a ring extension spring.
  • the screw nut seat is provided with two longcircular holes, said holes have the threads on its lower portion.
  • the nut seat is provided with a guide pillar on its bottom surface, the guide pillar can vertically slide along a guide hole on the base of the stationary body.
  • the screw is secured in the radial direction, under the action of the cam the nut seat can move vertically rela­tive to the radially secured screw.
  • Figs. 2-15 show the first embodiment of the bench vice employing the screw drive mechanism according to the present invention, which comprises a stationary body 21 having a hollow portion; a movable body 22 positioned within said hollow portion of said stationary body 21; a pair of vice jaws 12, 14; a handle 1, a screw 20, an eccentric cam 17, a screw nut seat 19, ratchet sleeve 9, a compression spring 8 and a gasket 6, etc, wherein the movable 22 can slide along the guide track in the stationary body 21 and the handle 1 mounted in a through hole on left end of the screw 20 may cause the screw turning to left (N-direction) or right (M-direction).
  • the gasket 6 is provided between an inner end surface 68 on a left projection of the screw 20 and an outer end surface of the support hole 7 on front vertical plate of movable body 22.
  • a cylindrical compression spring 44 At the right shouder of the screw 20, there is provided a cylindrical compression spring 44, its an end through a gasket 41 bears against the inner side the back vertical plate of movable body 22, while the end of the right neck journal of screw 20 has a gasket 42 and a stop collar 43 to protect the neck journal from sliding off.
  • ⁇ there is a gap ⁇ between the end surface 60 on left projection of the screw 20 and the end surface 61 of gasket 6.
  • the width of ⁇ is about 1 ⁇ 2 of the pitch in screw 20. This ⁇ is prepared for that when accidentally there happens the teeth touching against in an engagement of the threads 25 and 15 may bring the screw 20 to have a little axial movement freely and then a suitable engagement can be achieved.
  • the screw 20 being provided a key-way connects with the ratchet sleeve 9 through the guide key 16 and the screw 20 also passes through the axial hole of the ratchet sleeve 9, in addition, the screw 20 has outer threads 25 (see fig. 2 and 3).
  • the screw nut seat 19 is in the form of saddle (see fig 4), which is fixed on the stationary body 21 by means of the bolts 11.
  • the two arms 40 on the seat 19 have respectively the concentric holes 38.
  • the cross-­sectional shape of the holes 38 is formed by two circulr arcs, i.e. the upper arc "a” and the lower arc “b” (see fig. 5).
  • the center of circle of the upper arc “a” is O1 and the central angle ⁇ of the arc "a” is no more than 180 o .
  • the radius of upper arc "a” is r1 which equals to the thread radius of the outer threads 25 on screw 20.
  • the surfaces on the upper arcs "a" of the two holes have respectively the inner threads 15 which can engage with the outer threads 25 of the screw 20.
  • the center of circle of the lower arc “b” is O2 which is beneath the center O1 of the upper arc “a” and there is an eccentric distance “e” between the two centers O1 and O2.
  • the “e” should be greater than the tooth depth of the threads 15, 25, and the radius r2 of the lower arc "b” should be greater than the thread radius of outer threads on screw 20 in order to ensure that when the screw 20 descends from position 01 to position O2, it does not touch with any portions of the wall on the hole of seat 19 (as shown in fig. 9) and can displace freely along the axial direction of screw 20.
  • the eccentric cam 17 is positioned between one arm 40 and the ratchet sleeve 9.
  • the curve for the cam is divided into a downward stroke curve portion (with the lowest point 32) and an upward stroke curve portion (with the highest point 31) (see fig. 7).
  • the cam 17 has also a positioning projection 52 and a positioning plane 51. In left turning, the positioning projection 52 will touch a horizontal limit plane 56 of the movable body 22, at this point, the lowest point 32 on the cam curve will just oppose the supporting surface 24 of seat 19 so as to cause the cam 17 and the screw 20 to be situated in the most released posi­tion O2 (see fig. 11). Similarly (see fig.
  • the positioning plane 51 will touch the side wall surface 55 on the movable body 22, at this point, the highest point 31 on upward stroke curve portion of the cam 17 will touch the cam support surface 24, under an influence of the upward stroke curve of cam 17, causing the axis of screw 20 to ascend from position O2 up to position O1, so that its outer threads 25 engage with the inner threads 15 on the seat 19 (see fig. 13).
  • the ratchet sleeve 9 connects with screw 20 through the quide key 16 and has a flange 57 which is provided with one (or more) one-way Pawl 58 formed by a vertical surface 47 and an oblique surface 48 (see fig. 6 and fig. 10), under an action of the cylindrical compression spring 8 to ensure the ratchet sleeve 9 and the cam 19 to press together forever.
  • the cam 17 is in a released position relative to the cam supporting surface 24 of the screw nut seat 19 (see fig. 11).
  • the front end and the back end of the screw 20 are supported respectively on the lower supporting surfaces 36 and 37 of the supporting holes 7 and 23 on the front and back vertical plates of the movable body 22 (see fig. 8), meanwhile, the positions of the supporting holes 7 and 23 ensure the central axis of the screw 20 to be at the center O2 of the lower arc "b", while the outer threads 25 on screw 20 does not contact with the inner surfaces on the holes 38 of the seat 19 in any portion (see. fig.
  • the movable body 22 may be pushed or pulled manually such that the movable body 22 can slide quickly along the guide track in the stationary body 21 with the screw 20 to fast adjust the opening S of the vice jaws according to the size of a workpiece.
  • the highest point 31 on upward stroke curve of the cam 17 just touches the supporting surface 24 of the seat 19 and the screw 20 also lifts vertically along the parallel side walls 101 of holes 3,27 to a highest position, i.e., the central axis of screw 20 ascends vertically over an eccentric distance "e" from its original position 02-02 to a position 01-01, until the outer threads 25 of screw 20 engage with the threads 15 in the holes 38 of seat 19 and the engagement should ensure the pair of the inner and outer threads 15, 25 to be turnable each other (see fig. 13).
  • the ratchet sleeve 9 driven by the screw 20 and quide key 16 also turns to left by a certain angle until the pawl 58 falls into pawl groove 53 (see fig. 10) under the pressure of the compression spring 8.
  • the screw 20 drives the ratchet sleeve 9 to continue its left turn, and pushes the cam 17 to turn in lefthand direction through two contacted vertical surface 47 and 50 respectively on the pawl 58 and pawl groove 53, causing the cam gradually into a released position, i.e., causing the lowest point 32 on the downward stroke to turn gradually to its lowest position (see fig.
  • Figs 16-27 show the second embodiment according to the present invention, which shows a bench vice for a tool and comprises a stationary body 63, a movable body 64, a screw 20, an eccentric cam 65, a screw nut seat 68, an one-way pawl pin 73, a ring extension spring 76, a positioning pin 74.
  • said one-way pawl device adopts a pawl pin 73 instead of the ratchet sleeve 9 in first embodiment.
  • the movable body 64 can slide along the guide track in the stationary body 63, the screw 20 passes through the holes in the eccentric cam 65 and the screw nut seat 68;
  • the screw nut seat 68 is in the form of saddle with a upper top portion 88 (see fig. 21), and is fixed on the stationary body 63 by means of the bolts 75;
  • the holes of screw nut seat 68 are in the form of long-circular hole, which have two parallel side walls 87, a upper arc portion 86, and a lower arc portion with the inner threads 15 suitable to engage with the outer threads 25 of the screw 20.
  • the width of the long-circular holes is substantially equal to the diameter of the screw 20.
  • the eccentric cam 65 is located within the screw nut seat 68, the curve portion 92 of eccentric cam 65 is circular and can slide between the upper cam support surface 94 and the lower cam support surface 95 of nut seat 68; the eccentric cam 65 is provided on the plane 89 with a radial hole 67 and a threaded hole 90; the eccentric cam 65 is further provided with a groove 77 for receiving a ring extension spring 76, said groove 77 surrounds the outer circumference of cam 65 and passes through the end centre of radial hole 67 (see fig. 19).
  • the positioning pin74 is secured in the threaded hole 90 of cam 65 by threads.
  • the pawl pin 73 is located within the radial hole 67 of the cam 65 and can slide radially along the hole 67.
  • the pawl pin 73 is provided with a one-way pawl formed by a vertical surface 79 and an oblique surface 78.
  • the pawl pin 73 is further provided with a hole 80 through which the ring extension spring 76 can pass.
  • the ring extension spring 76 is located around the groove 77 of the cam 65 and passes through the hole 80 of the pawl pin 73.
  • the screw 20 is provided along its axial direction with two one-way pawl groove 81 formed by a vertical surface 83 and an oblique surface 82 (see fig. 24 and 27).
  • the front end plate of movable body 64 is provided with two holes in which the spring 71 are located, the springs 71 can ensure that there is a gap " ⁇ " between the front end wall and the gasket 70, and may bring the screw 20 to have a little axial movement and then a suitable engagement can be achieved.
  • a gasket 93 is located inner side of front end wall of movable body and prevents the screw 20 from sliding off.
  • eccentric cam 65 causes the screw 20 to descend along two parallel walls 87 of long-circular hole of nut seat 68, with the axis of screw 20 dropping from its highest position 01-01 to its lowest position 02-02, thus the threads 25 of screw 20 engage with the threads 15 of nut seat 68 each other (see fig. 25).
  • the oblique surface 78 of pawl pin 73 will slide along the oblique surface 82 of pawl groove 81 of screw 20 when the component acting on two oblique surfaces is greater than the extension force of the ring spring 76, until the pawl pin 73 leaves out from the pawl goove 81 (see fig. 27); then the screw 20 can turn continuously.
  • Figs. 28-32 show the third embodiment according to the present invention wherein the structures of the pawl pin, the eccentric cam and the nut seat are basically identical to those of the second embodiment, but the nut seat 68 is provided on its bottom surface with a guide pillar 96 which can slide vertically along a guide hole 97 on the base 100 of statinary body 63.
  • the screw 20 supported on two holes of two end walls of the movable body 64 can not move vertically up and down and can only turn, while the nut seat 60 can move vertically under the action of eccentric cam 65, so that the threads 25, 15 of screw 20 and nut seat 68 may engage with or disengage from each other.
  • the screw 20 can move along the axial direction "K" while it continues to turns to right, and pushes the movable body 64 through the gasket 70 to clamp the workpiece (see fig. 29).
  • the screw 20 drives the eccentric cam 65 by the contacted vertical surfaces 83 and 79 respectively on the pawl groove 81 and the pawl pin 73, thus the cam 65 rotates to causes the nut seat 68 to descend vertically relative to the radially fixed screw 20, so that the threads 25 of screw 20 disengage from the threads 15 of nut seat 68, the movable body can move freely in the axial direction (see fig. 28).
  • the mechanism may have a variety of medifications, which should be considered within the scope of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Transmission Devices (AREA)
EP89305364A 1988-08-08 1989-05-26 Mécanisme de vissage et étau Expired - Lifetime EP0354644B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN 88104905 CN1016524B (zh) 1988-08-08 1988-08-08 丝杠垂直升降开合式螺杆传动机构
CN88104905 1988-08-08
CN88106661 1988-09-14
CN 88106661 CN1011158B (zh) 1988-09-14 1988-09-14 改进的丝杠垂直升降开合螺杆机构

Publications (3)

Publication Number Publication Date
EP0354644A2 true EP0354644A2 (fr) 1990-02-14
EP0354644A3 EP0354644A3 (fr) 1991-03-20
EP0354644B1 EP0354644B1 (fr) 1994-07-27

Family

ID=25742474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89305364A Expired - Lifetime EP0354644B1 (fr) 1988-08-08 1989-05-26 Mécanisme de vissage et étau

Country Status (10)

Country Link
EP (1) EP0354644B1 (fr)
JP (1) JPH0288179A (fr)
AU (1) AU614390B2 (fr)
BR (1) BR8903962A (fr)
DE (2) DE68917047T2 (fr)
GB (1) GB2221634A (fr)
MX (1) MX172487B (fr)
MY (1) MY104146A (fr)
NZ (1) NZ229177A (fr)
RU (2) RU2052691C1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0508569A1 (fr) * 1991-04-03 1992-10-14 Chaolai Fan Mécanisme vis-écron à accouplement synchronique
US5282392A (en) * 1991-01-31 1994-02-01 Chaolai Fan Synchro-clutching screw-and-nut mechanism
FR2704292A1 (fr) * 1993-04-23 1994-10-28 Fan Chaolai Mécanisme d'entraînement à vis à vitesses élevée et faible.
CN114738367A (zh) * 2022-04-14 2022-07-12 合肥屹坤精工科技有限公司 一种用于服务器设备精密紧固件防脱结构

Families Citing this family (21)

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Publication number Priority date Publication date Assignee Title
JPH0423256U (fr) * 1990-06-20 1992-02-26
US6135435A (en) * 1996-08-07 2000-10-24 Wilton Corporation Woodworker's vise
AU146705S (en) 2000-09-06 2002-02-04 Record Tools Ltd Clamp
AU146704S (en) 2000-09-06 2002-02-04 Record Tools Ltd Clamp
GB2371252A (en) * 2001-01-22 2002-07-24 Record Tools Ltd Bench vice with quick release mechanism
DE10151597C1 (de) * 2001-10-18 2003-05-15 Howaldtswerke Deutsche Werft System und Verfahren zur Erkennung und Abwehr von Laserbedrohungen und Unterwasserobjekten für Unterwasserfahrzeuge
US6957808B2 (en) 2001-11-13 2005-10-25 Wmh Tool Group, Inc. Apparatus for securing a workpiece
USD487864S1 (en) 2002-02-01 2004-03-30 Wmh Tool Group, Inc. Base for an apparatus for securing a work piece
USD500238S1 (en) 2002-02-01 2004-12-28 Wmh Tool Group, Inc. Apparatus for securing a work piece
USD488044S1 (en) 2002-02-01 2004-04-06 Wmh Tool Group, Inc. Apparatus for securing a work piece
USD485740S1 (en) 2002-03-01 2004-01-27 Wmh Tool Group, Inc. Apparatus for securing a workpiece
US7017898B2 (en) 2002-03-01 2006-03-28 Wmh Tool Group, Inc. Apparatus for securing a workpiece
US7066457B2 (en) 2003-01-21 2006-06-27 Wmh Tool Group, Inc. Apparatus for securing a workpiece
USD494828S1 (en) 2003-01-21 2004-08-24 Wmh Tool Group, Inc. Apparatus for securing a workpiece
USD487220S1 (en) 2003-01-21 2004-03-02 Wmh Tool Group, Inc. Base for an apparatus for securing a workpiece
EP1744857A4 (fr) 2004-02-23 2010-02-03 Wmh Tool Group Inc Pince parallele et accessoires a cet effet
CN101259603B (zh) 2007-11-09 2012-06-27 范朝来 一种节材型多功能台钳
CN103056792B (zh) * 2013-02-04 2015-06-17 南通金鑫五金工具有限公司 台虎钳
CN103358240A (zh) * 2013-07-30 2013-10-23 高素军 一种虎钳夹紧装置
CN110513456A (zh) * 2019-09-24 2019-11-29 广州铭匠智能科技有限公司 一种丝杆螺母机构
CN115118099B (zh) * 2022-08-05 2023-12-15 中达电机股份有限公司 一种电机铜排转子表面加工用工装及加工工艺

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DE198374C (fr) *
GB170406A (en) * 1920-07-20 1921-10-20 Johan Fredrik Olof Ohborg Improvements in vices
US2102602A (en) * 1935-09-28 1937-12-21 Steel Nut & Joseph Hampton Ltd Vise
GB462834A (en) * 1935-09-28 1937-03-17 Steel Nut & Joseph Hampton Ltd Improvements relating to vices
US2138245A (en) * 1937-10-30 1938-11-29 David C Smith Adjustable clamping tool
US2430458A (en) * 1945-08-27 1947-11-11 Titan Mfg Company Automatic screw control
GB697238A (en) * 1950-09-23 1953-09-16 Steel Nut & Joseph Hampton Ltd Improvements in quick release vices
GB800885A (en) * 1956-03-13 1958-09-03 Steel Nut And Joseph Hampton L Improvements in or relating to vices
GB819506A (en) * 1957-01-11 1959-09-02 Wilton Tool Mfg Co Inc Clamping and holding device
GB857116A (en) * 1958-09-19 1960-12-29 William Henry Norris Gittins Vices
US4262892A (en) * 1980-02-22 1981-04-21 Wu Rong Chun Quick-operating bench vise
JPH0328253Y2 (fr) * 1986-02-07 1991-06-18
US4834355A (en) * 1987-09-03 1989-05-30 Chaolai Fan Mechanical program-controlled fast range-adjusting device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5282392A (en) * 1991-01-31 1994-02-01 Chaolai Fan Synchro-clutching screw-and-nut mechanism
EP0508569A1 (fr) * 1991-04-03 1992-10-14 Chaolai Fan Mécanisme vis-écron à accouplement synchronique
FR2704292A1 (fr) * 1993-04-23 1994-10-28 Fan Chaolai Mécanisme d'entraînement à vis à vitesses élevée et faible.
CN114738367A (zh) * 2022-04-14 2022-07-12 合肥屹坤精工科技有限公司 一种用于服务器设备精密紧固件防脱结构
CN114738367B (zh) * 2022-04-14 2024-04-12 合肥屹坤精工科技有限公司 一种用于服务器设备精密紧固件防脱结构

Also Published As

Publication number Publication date
RU2052692C1 (ru) 1996-01-20
BR8903962A (pt) 1990-03-20
MX172487B (es) 1993-12-17
DE8907067U1 (de) 1989-09-07
AU3710189A (en) 1990-02-08
EP0354644A3 (fr) 1991-03-20
RU2052691C1 (ru) 1996-01-20
JPH0543464B2 (fr) 1993-07-01
EP0354644B1 (fr) 1994-07-27
DE68917047T2 (de) 1995-01-26
AU614390B2 (en) 1991-08-29
GB8917443D0 (en) 1989-09-13
JPH0288179A (ja) 1990-03-28
MY104146A (en) 1994-02-28
DE68917047D1 (de) 1994-09-01
GB2221634A (en) 1990-02-14
NZ229177A (en) 1991-06-25

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