EP0354644B1 - Screw drive mechanism and vice - Google Patents

Screw drive mechanism and vice Download PDF

Info

Publication number
EP0354644B1
EP0354644B1 EP89305364A EP89305364A EP0354644B1 EP 0354644 B1 EP0354644 B1 EP 0354644B1 EP 89305364 A EP89305364 A EP 89305364A EP 89305364 A EP89305364 A EP 89305364A EP 0354644 B1 EP0354644 B1 EP 0354644B1
Authority
EP
European Patent Office
Prior art keywords
screw
nut seat
cam
mechanism according
driven 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.)
Expired - Lifetime
Application number
EP89305364A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0354644A3 (en
EP0354644A2 (en
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/en
Publication of EP0354644A3 publication Critical patent/EP0354644A3/en
Application granted granted Critical
Publication of EP0354644B1 publication Critical patent/EP0354644B1/en
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

  • This invention relates to a screw drive mechanism which permits a screw to engage with or disengage from a screw nut quickly by a relative movement between the screw and the nut, and may be applied in a manual bench vice, bench vice for a tool, or the sliding table of a tool where there is a requirement for quickly passing through an idle stroke, speedily adjusting a relative distance or fast clamping.
  • US-A-2102602 (1937) disclosed a vice mechanism having the features of the preamble of present claim 1, but in which the locus of centre of the screw is an arc when the screw disengages or engages to the nut. Thus, the nut has to connect slidingly with a stationary body, which would give poor strength.
  • US-A-2430458 (1947) also discloses a mechanism in which the nut will remain on the screw after they are disengaged, and where the nut is pressed against an outer circumference of the screw by a spring and a pin. This will cause a large resistance.
  • My own EP-A-306119 (which is in Article 54(3) EPC relation to this patent) disclosed a fast clamping mechanism, in which a driving nut is provided outside the vice body. The mechanism is complex in construction.
  • a screw driven mechanism (having the features of the preamble of claim 1) is characterised in that the nut seat has axially-spaced arms with respective axially aligned slotted holes through which the screw passes, the slot elongation being in the direction of said transverse relative movement of the screw and nut seat; the eccentric member is an eccentric cam positioned around the screw between the arms of the nut seat and which has an outward cam surface which slidably engages a cam support surface of the nut seat, and the relative transverse movement which engages/disengages the thread is guided in one plane either by the nut seat or by correspondingly slotted holes in the first body, through which holes the screw extends.
  • the nut seat is a saddle fixed to the second body and the engagement/disengagement movement is guided in one plane by axially aligned slotted holes having parallel side walls spaced substantially by the diameter of the screw, to guide the screw
  • the pawl connection comprises a sleeve fitting around the screw next to the eccentric cam between the arms of the nut seat, and constrained by a key to rotate with the screw, the sleeve being urged axially against the eccentric cam by a spring, and a pawl on the sleeve being engageable in a ratchet recess of the eccentric cam. Under the action of the cam, the screw can be vertically moved relative to the secured nut seat.
  • the pawl connection is by a pawl pin comprised in the eccentric cam member and spring-urged radially inwardly against the screw, which has a ratchet recess for engagement by the pawl pin so that the screw and cam member can rotate together, and the relative transverse movement which engages/disengages the thread is guided in one plane by the nut seat.
  • the nut seat is connected to the second body by a guide pillar which slides in a guide hole in the second body.
  • the screw is transversely fixed relative to the first body and the engagement/disengagement movement is guided in one plane by the guided transverse movement of the nut seat relative to the second body.
  • the screw is thus secured in the radial direction, while under the action of the cam the nut seat itself can move vertically relative to the radially secured screw.
  • Figs. 2-15 show a bench vice which comprises a stationary body 21 having a hollow portion; a movable body 22 positioned within the hollow portion; 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.
  • the movable body 22 can slide along the guide track in the stationary body 21 and the handle 1, mounted in a through-hole at the left-hand end of the screw 20, may cause the screw to turn to the left (N-direction) or right (M-direction).
  • the two ends of the screw 20 are supported in respective support holes 7,23 of the front and back vertical plates of the movable body 22.
  • the two support holes 7,23 are both in an oval form having two parallel side walls 101, the width of the holes being substantially equal to the diameter of the screw so as to permit the screw 20 to move up and down only vertically.
  • the gasket 6 is provided between an inner end surface 68 of a left projection of the screw 20, and an outer end surface of the support hole 7 of the front vertical plate of the movable body 22.
  • the screw 20 has a key-way which connects with the ratchet sleeve 9 through a guide key 16.
  • the screw 20 also passes through the axial hole of the ratchet sleeve 9.
  • the screw 20 has outer threads 25 (see Figs. 2 and 3).
  • the screw nut seat 19 is in the form of a saddle (see Fig. 4), which is fixed on the stationary body 21 by means of bolts 11.
  • the two arms 40 of the seat 19 have respective concentric holes 38.
  • the cross-sectional shape of the holes 38 features two circular arcs, the upper arc "a” and the lower arc “b” (see Fig. 5).
  • the centre of circle of the upper arc “a” is 01 and the central angle of the arc "a” is no more than 180°.
  • the radius of upper arc "a” is r1 and equals the thread radius of the outer threads 25 on screw 20.
  • the surfaces of the upper arcs "a” of the two holes have respective inner threads 15 which can engage with the outer threads 25 of the screw 20.
  • the centre circle of the lower arc "b” is 02, beneath the centre 01 of the upper arc "a”, and there is an eccentricity distance “e” between the two centres 01 and 02.
  • the distance "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 that the thread radius of the outer threads of the screw 20 so that when the screw 20 descends from position 01 to position 02, it need not touch any portions of the wall of the hole (as shown in Fig. 9) and hence can displace freely along its axial direction.
  • the eccentric cam 17 is positioned between one arm 40 and the ratchet sleeve 9.
  • the curve of 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.
  • the positioning projection 52 will meet a horizontal limit plane 56 of the movable body 22.
  • the lowest point 32 on the cam curve will just oppose the supporting surface 24 of seat 19 so that the cam 17 and the screw 20 are in the most released position 02 (see Fig. 11).
  • the positioning plane 51 will meet the side wall surface 55 of the movable body 22.
  • the ratchet sleeve 9 connects with the screw 20 through the guide key 16 and has a flange 57 which is provided with a (one or more) pawl 58 formed by a vertical surface 47 and an oblique surface 48 (see Fig. 6 and Fig. 10).
  • a cylindrical compression spring 8 ensures that the ratchet sleeve 9 and the cam 19 are always pressed together.
  • the movable body 22 may be pushed or pulled manually such that the movable body 22 slides quickly along the guide track in the stationary body 21 with the screw 20, to adjust quickly the opening S of the vice jaws according to the size of a workpiece.
  • the movable body can be pushed so that the jaws 12,14 contact a work-piece 28.
  • the cam also turns to the right, bringing its upward stroke curve to slide on the cam supporting surface 24 of the screw nut seat 19 until the positioning plane 51 of the cam 17 contacts with the limit surface 55 to stop the rotation (see Fig. 15).
  • the highest point 31 on the upward stroke curve of the cam 17 just touches the supporting surface 24 of the seat 19 and the screw 20 is lifted vertically along the parallel side walls 101 of holes 3,27 to a highest position.
  • the central axis of the screw 20 ascends vertically over an eccentricity distance "e” from its original position 02-02 to a position 01-01, until its outer threads 25 engage with the threads 15 in the holes 38 of the seat 19 so as to be relatively turnable (see Fig. 13).
  • the ratchet sleeve 9 driven by the screw 20 and guide key 16 also turns to the left until the pawl 58 falls into the 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 turns the cam 17 in the lefthand direction through the abutting vertical surfaces 47 and 50 of the pawl 58 and pawl groove 53, moving the cam gradually to a released position, i.e., causing the lowest point 32 on the downward stroke to turn gradually to its lowest position (see Fig. 11) until the positioning projection 52 of cam 17 contacts with the horizontal limit plane 56.
  • the central axis of the screw 20 descends vertically from position 01 to position 02, dropping a height "e" and disengaging the screw outer threads 25 wholly from the inner seat threads 15.
  • the front and back ends of the screw 20 fall respectively on the lower supporting surfaces 36,37 of the supporting holes 7,23 of the front and back plates of the movable body 22 (see Fig. 8). Therefore, the screw 20 may displace forward or backward freely with the movable body 22 and such that the opening of the vice jaws 12,14 can be quickly adjusted as described in step 1.
  • Figs. 16-27 show a second embodiment of the present invention, which is 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, a one-way pawl pin 73, a ring extension spring 76, and a positioning pin 74.
  • the one-way pawl device has a pawl pin 73 instead of the ratchet sleeve 9 of the first embodiment.
  • the movable body 64 can slide along the guide track in the stationary body 63, and 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 a saddle, with an upper portion 88 (see Fig. 21), and is fixed on the stationary body 63 by means of bolts 75.
  • the holes of the screw nut seat 68 are elongate, with two parallel side walls 87, an upper arc portion 86, and a lower arc portion with inner threads 15 suitable to engage with the outer threads 25 of the screw 20.
  • the width of the elongate 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 the eccentric cam 65 is circular and can slide between the upper cam support surface 94 and the lower cam support surface 95 of the nut seat 68.
  • the eccentric cam 65 is provided on the plane 89 with a radial hole 67 and a threaded hole 90. It also has a groove 77 for receiving a ring extension spring 76, said groove 77 surrounding the outer circumference of cam 65 and passing through the end centre of radial hole 67 (see Fig. 19).
  • the positioning pin 74 is secured in the threaded hole 90 of the 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 in its axial direction with two pawl grooves 81 each having a vertical surface 83 and an oblique surface 82 (see Figs. 24 and 27).
  • the front end plate of the movable body 64 is provided with two holes in which the spring 71 is located, to ensure that there is a gap " ⁇ " between the front end wall and the gasket 70, and allow the screw 20 to have a little axial play so that a suitable engagement can be achieved.
  • a gasket 93 is located on the inner side of the front end wall of the movable body and prevents the screw 20 from sliding off.
  • the rotation of the eccentric cam 65 causes the screw 20 to descend along the parallel walls 87 of the elongate hole of the nut seat 68, with the axis of the screw 20 dropping from its highest position 01-01 to its lowest position 02-02, and the screw threads 25 engaging with the nut seat threads 15 (see Fig. 25).
  • the oblique surface 78 of pawl pin 73 slides over the oblique surface 82 of the pawl groove 81 of screw 20 when the component acting on the two oblique surfaces is greater than the extension force of the ring spring 76, so that the pawl pin 73 leaves the pawl groove 81 (see Fig. 27); then the screw 20 can turn continuously.
  • Figs. 28-32 show a third embodiment of 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 in a guide hole 97 through the base 100 of the stationary body 63.
  • the screw 20, supported in two holes of the end walls of the movable body 64, cannot move vertically up and down but 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 drives the eccentric cam 65 through the pawl groove and pawl pin 73.
  • the eccentric cam 65 rotates under the limit of two surfaces 94 and 95, and causes the nut seat 68 to ascend vertically over a distance "h", because the screw 20 is fixed in the radial direction, (see Fig. 29, and Fig. 32).
  • the nut seat threads 15 engage with the screw threads 25.
  • the pawl pin 73 slides out of the pawl groove of the screw 20.
  • the screw 20 can then move along the axial direction "K" while it continues to turn to the right, and push the movable body 64 via 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 of the pawl groove 81 and the pawl pin 73.
  • the cam 65 rotates to cause the nut seat 68 to descend vertically relative to the radially fixed screw 20, so that the threads 25 of the screw 20 disengage from the threads 15 of the nut seat 68 and the movable body can move freely in the axial direction (see Fig. 28).

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 Screw drive mechanism and vice Expired - Lifetime EP0354644B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN88104905 1988-08-08
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
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 EP0354644A2 (en) 1990-02-14
EP0354644A3 EP0354644A3 (en) 1991-03-20
EP0354644B1 true EP0354644B1 (en) 1994-07-27

Family

ID=25742474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89305364A Expired - Lifetime EP0354644B1 (en) 1988-08-08 1989-05-26 Screw drive mechanism and vice

Country Status (10)

Country Link
EP (1) EP0354644B1 (enrdf_load_stackoverflow)
JP (1) JPH0288179A (enrdf_load_stackoverflow)
AU (1) AU614390B2 (enrdf_load_stackoverflow)
BR (1) BR8903962A (enrdf_load_stackoverflow)
DE (2) DE68917047T2 (enrdf_load_stackoverflow)
GB (1) GB2221634A (enrdf_load_stackoverflow)
MX (1) MX172487B (enrdf_load_stackoverflow)
MY (1) MY104146A (enrdf_load_stackoverflow)
NZ (1) NZ229177A (enrdf_load_stackoverflow)
RU (2) RU2052692C1 (enrdf_load_stackoverflow)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0423256U (enrdf_load_stackoverflow) * 1990-06-20 1992-02-26
US5282392A (en) * 1991-01-31 1994-02-01 Chaolai Fan Synchro-clutching screw-and-nut mechanism
CN1024037C (zh) * 1991-04-03 1994-03-16 范朝来 三点包容螺母升降自动同步开合式螺杆机构
CN1042055C (zh) * 1993-04-23 1999-02-10 范朝来 一种快慢速螺杆传动机构
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
USD488044S1 (en) 2002-02-01 2004-04-06 Wmh Tool Group, Inc. Apparatus for securing a work piece
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
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
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
US7066457B2 (en) 2003-01-21 2006-06-27 Wmh Tool Group, Inc. Apparatus for securing a workpiece
CN1946519B (zh) 2004-02-23 2010-12-08 华特麦尔工具集团公司 平行夹具及其附件
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
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
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 (enrdf_load_stackoverflow) *
GB170406A (en) * 1920-07-20 1921-10-20 Johan Fredrik Olof Ohborg Improvements in vices
GB462834A (en) * 1935-09-28 1937-03-17 Steel Nut & Joseph Hampton Ltd Improvements relating to vices
US2102602A (en) * 1935-09-28 1937-12-21 Steel Nut & Joseph Hampton Ltd Vise
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 (enrdf_load_stackoverflow) * 1986-02-07 1991-06-18
US4834355A (en) * 1987-09-03 1989-05-30 Chaolai Fan Mechanical program-controlled fast range-adjusting device

Also Published As

Publication number Publication date
JPH0288179A (ja) 1990-03-28
MY104146A (en) 1994-02-28
AU3710189A (en) 1990-02-08
EP0354644A3 (en) 1991-03-20
DE68917047D1 (de) 1994-09-01
BR8903962A (pt) 1990-03-20
RU2052691C1 (ru) 1996-01-20
RU2052692C1 (ru) 1996-01-20
DE68917047T2 (de) 1995-01-26
MX172487B (es) 1993-12-17
GB2221634A (en) 1990-02-14
JPH0543464B2 (enrdf_load_stackoverflow) 1993-07-01
NZ229177A (en) 1991-06-25
GB8917443D0 (en) 1989-09-13
DE8907067U1 (de) 1989-09-07
AU614390B2 (en) 1991-08-29
EP0354644A2 (en) 1990-02-14

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