EP0216959B1 - Cric à vis - Google Patents

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Publication number
EP0216959B1
EP0216959B1 EP19850201589 EP85201589A EP0216959B1 EP 0216959 B1 EP0216959 B1 EP 0216959B1 EP 19850201589 EP19850201589 EP 19850201589 EP 85201589 A EP85201589 A EP 85201589A EP 0216959 B1 EP0216959 B1 EP 0216959B1
Authority
EP
European Patent Office
Prior art keywords
beveled gear
ram
teeth
bearing
lifting jack
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
Application number
EP19850201589
Other languages
German (de)
English (en)
Other versions
EP0216959A1 (fr
Inventor
Isamu Aihara
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.)
Osaka Jack Manufacturiung Co Ktd
Original Assignee
Osaka Jack Manufacturiung Co Ktd
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 Osaka Jack Manufacturiung Co Ktd filed Critical Osaka Jack Manufacturiung Co Ktd
Priority to EP19850201589 priority Critical patent/EP0216959B1/fr
Priority to DE8585201589T priority patent/DE3575411D1/de
Publication of EP0216959A1 publication Critical patent/EP0216959A1/fr
Application granted granted Critical
Publication of EP0216959B1 publication Critical patent/EP0216959B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • 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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/16—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated actuated through bevel-wheel gearings

Definitions

  • the invention relates to a lifting jack for use under heavy loads such as supporting wall structures in buildings or raising heavy loads in construction environments such as bridges, ship building and other similar works, said jack being operable from a source of rotary energy and comprising:
  • Such a lifting jack is known from a brochure called "OJ. Mechanical Jacks” put out by Osaka Jack Co., Ltd. in July 1984.
  • the thrust bearing of this known construction is a ball or roller bearing.
  • a ball or roller bearing permits the beveled gear to remain rotatable notwithstanding the substantial load imposed upon it by the weight of the subject to be lifted.
  • Lifting jacks for heavy loads are frequently used in outdoor environments and are subjected to extreme temperatures, weathering, corrosive environments and contamination of the lubrication oil, being harmful for the proper functioning of the roller or ball bearing.
  • An other disadvantage of the ball or roller bearing is that it requires a considerable design height increasing the overall height of the jack.
  • US-A 4 000 880 discloses a screw jack for lifting automobile underframes, comprising the components as mentioned in the first paragraph, however having a thrust bearing formed as a steel washer.
  • the screw jack of US-A 4 000 880 would not work due to fact that the baffle gear does not remain rotatable under heavy load.
  • a lifting jack as specified in the preamble of this description is characterized according to the invention in that the thrust bearing is a planar bearing formed of a polytetrafluoro-ethylene.
  • planar bearing is one in which it is formed of multiple layers of polytetrafluoro-ethylene.
  • the lower base surface comprises a substantially planar surface wherein said lifting jack further includes a planar plate member attached to the beveled gear supported by the planar bearing and engaging downwardly into and substantially filling said interior cavity on top of and in contact with said low friction planar bearing material.
  • a typical lifting jack with a lifting hook and an A-shaped frame is known from US-A 3 412 980 with a ball bearing between the rotary screw spindle carrying the beveled gear and its support.
  • This jack is only suitable for rather low loads like automobiles.
  • the support is adjustably taken up in the stationary construction by similarly shaped spherical surfaces with a layer of polytetrafluoro-ethylene between them, but only for slight mutual adjustments in position and not between force transmitting surfaces, of one rotates and the other is stationary.
  • Figure 1 shows a section view of a lifting jack constructed in accordance with the present invention.
  • a body (17) formed of a rigid material such as cast iron or steel defines a base cavity (45) and a cylindrical ram passage (41) and a pinion passage. The latter is generally perpendicular to ram passage (41) for reasons set forth below in greater detail.
  • Body (17) further defines a circular threaded passage (55) which is generally concentric with ram passage (41).
  • a generally cylindrical base (28) defines a base surface (82) and an upwardly extending wall (53). Wall (53) defines an external thread (54) which cooperates with thread (55) of body (17) to secure and attach base (28) to the lower end of body (17).
  • Base (28) provides the resting surface for the lifting jack and defines a bearing surface (67) on its interior.
  • Bearing surface (67) is generally flat and recessed in correspondence with wall (53).
  • a plate (83) having a substantially annular construction is received within the interior of base (28) and overlies bearing surface (67).
  • Plate (83) defines a planar bearing surface (68).
  • a sliding pad (29) formed of a fluorine resin material such as Teflon (Trademark of DuPont) or similar self-lubricating low friction material of polytetrafluoro-ethylene is interposed between bearing surfaces (67 and 68) in accordance with an important aspect of the present invention.
  • a beveled gear (67) having a structure generally in accordance with the prior art defines a plurality of angularly positioned teeth (50) and a center aperture.
  • Beveled gear (27) rests upon and is attached to plate (83).
  • a generally cylindrical elongated screw bar (14) defines an external thread (47) for the upward portion of its length and terminates at its lower end in a rim (48) having a generally cylindrical construction and extending beyond the perimeter of threads (47).
  • Screw bar (14) further defines an extension (62) having a generally cylindrical shape which passes through said aperture in beveled gear (27).
  • Rim (48) further defines a surface (51) which rests upon beveled gear (27).
  • a bond (86) which may for example comprise a weld bead encircles the junction of rim (48) and beveled gear (27) to insure a complete attachment therebetween.
  • rotation of beveled gear (27) causes a corresponding angular rotation of screw bar (14).
  • a generally cylindrical ram (16) having a substantially hollow construction and formed of a rigid material such as steel, is received within ram passage (41) and defines a thread (43) over a portion of its upper inner surface.
  • a threaded sleeve (21) having an exterior surface substantially conforming to the interior surface of ram (16) and an internal thread (46) which corresponds to thread (47) of screw bar (14) is received within a cavity (87) of ram (16), said cavity having a shoulder part at its top.
  • a set screw (15) is received between ram (16) at cavity (87) and threaded sleeve (21) to secure the attachment of this sleeve (21) to ram (16).
  • a head (10) having a generally cylindrical construction defines a center aperture (4) and a downwardly extending threaded portion (42). The latter cooperates with thread (43) of ram (16) to secure head (10) to ram (16).
  • a set screw (12) is received within ram (16) and abuts threaded portion (42) of head (10) to secure the attachment between head (10) and ram (16).
  • a flathead screw (11) is received within aperture (4).
  • Head (10) further defines a load surface (39).
  • Ram (16) further defines a channel (89) extending vertically over its entire length.
  • Body (17) further defines a pair of apertures in its upper wall which receive a pair of bolts (18 and 19).
  • a key having a configuration permitting it to be slidably received within channel (89) is secured to body (17) by the engagement of bolts (18 and 19) into threaded apertures (79).
  • channel (89) moves with respect to said key.
  • the cooperation of this key with channel (89) inhibits rotation of ram (16) which would otherwise take place due to the friction between thread (46) and (47) of threaded sleeve (21) and screw bar (14) respectively.
  • Body (17) further defines a pinion extension extending outwardly and generally perpendicular to ram passage (16) which defines a cylindrical pinion passage.
  • a cylindrical pinion bushing (24) is received within said pinion passage.
  • a set screw (20) is engaged between pinion bushing (24) and said pinion passage to secure the former to the latter.
  • a pinion gear (90) having a construction generally corresponding to the typical pinion gear in the art defines a plurality of angled teeth (66) which are configured in correspondence to teeth (50) of beveled gear (27).
  • Pinion gear (90) further defines a pinion shaft (73) which extends outwardly through said pinion passage and is supported by pinion bushing (24).
  • An annular thrust washer (80) is positioned between pinion gear (90) and pinion bushing (24) to position and support pinion gear (90) with respect to the axial thrust forces imposed by rotation of the gears under load.
  • Pinion shaft (73) further defines a multi-facetted portion (74) having a generally hexagonal construction and a cylindrical terminating portion.
  • a ratchet wheel (25) having a construction shown more clearly in Figure 2 is taken up in ratchet receptacle (72) and is configured to engage and be supported by the multy-facetted portion (74) of pinion shaft (73).
  • Ratchet wheel (25) includes a plurality of external teeth.
  • a ratchet case (30) having a generally cylindrical construction surrounds ratchet wheel (25) and receives the extension of pinion shaft (73).
  • a washer (23) is received upon pinion shaft (73) and a snap ring (26) engages the end portion of pinion shaft (73) to secure ratchet case (30) with respect to body (17) and pinion shaft (73).
  • ratchet (92) provides a bi-directional ratcheting function in which rotation of ratchet case (30) may selectively be coupled in a ratcheting fashion to pinion shaft (73) in either direction.
  • the structure of ratchet (92) is known in the prior art and therefore need not be described in great detail in connection with this invention.
  • ratchet case (30) defines a lateral passage which receives a ratchet liner (34), a ratchet plunger (35), is received with liner (34) and defines a plurality of teeth (93) which are configured to cooperate with and engage the teeth of ratchet wheel (25) when ratchet plunger (35) is moved to engagement with ratchet wheel (25).
  • Liner (34) further defines a detent aperture (76).
  • a housing (37) formed in ratchet case (30) defines an aperture (95) generally perpendicular to liner (34).
  • a steel ball (31) is supported within aperture (95).
  • a spring (32) is within aperture (95).
  • a set screw (33) captivates spring (32) in a compressive state against steel ball (31). The resulting structure forms a spring loaded detent mechanism which cooperates to maintain liner (34) and thereby ratchet plunger (35) in a fixed position.
  • Ratchet case (30) also defines a bar socket (70) extending downwardly from pinion shaft (73) and defining a cylindrical cavity (71).
  • cavity (71) receives a lever bar which permits the application of a substantial torque force to bar socket (70) and ratchet plunger (35).
  • ratchet plunger (35) or its counterpart (not shown) will be in engagement with the teeth of ratchet wheel (25):
  • the applied force to bar socket (70) will be coupled by the ratchet plunger engaging the ratchet wheel to turn pinion shaft (73).
  • Ratcheting action is provided by the. cooperation of ratchet plunger (35) and spring (36).
  • a plate (77) is received within ratchet case (30) to complete the enclosure of the ratchet structure.
  • ratchet case (30) In operation, the application of a lever force to bar socket (70) causes a corresponding torque to be applied to ratchet case (30). As mentioned above and depending upon which ratchet plunger (35) is moved into engagement with ratchet wheel (25), a corresponding torque is applied to ratchet wheel (25) and in turn to pinion shaft (73).
  • the torque imposed on pinion shaft (73) is coupled by teeth (66) and teeth (50) to bevel gear (27).
  • the torque applied to beveled gear (27) due to the attachment of bevel gear (27) to screw bar (14) causes rotation of screw bar (14).
  • threaded sleeve (21) Due to the cooperation of threads (46 and 47) in threaded sleeve (21) and screw bar (14) respectively, threaded sleeve (21) is driven upwardly carrying ram (16) with it.
  • the upward travel of ram (16) due to rotation of screw bar (14) causes surface (39) of head (10) to contact the load and drive it upward.
  • sliding pad (29) is substantially thinner than the prior art bearing structures and as a result reduces the overall height of the lifting jack.
  • the use of sliding pad (29) is not substantially affected by the presence of moisture or corrosive materials due to its inherent low friction non-metallic composition.
  • no lubricant is necessary to maintain the low friction bearing surface provided by sliding pad (29).

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Transmission Devices (AREA)

Claims (3)

1. Vérin de levage à utiliser pour des charges lourdes telles que des structures de murs de support dans des immeubles ou pour soulever des charges lourdes dans des chantiers de construction tels que des ponts, la construction de bateaux et d'autres travaux similaires, le vérin pouvant fonctionner à partir d'une source d'énergie rotative et comprenant:
un corps rigide (17) définissant une cavité interne (45), une surface inférieure de base (82) et un passage pour un bélier (41);
un engrenage conique (27) ayant une construction généralement annulaire et un premier ensemble circulaire de dents (50);
un engrenage à pignons (90) ayant un second ensemble de dents, qui peut contacter le premier ensemble de dents et un arbre à pignon (73) accouplant le second ensemble de dents à la source d'énergie rotative;
des moyens (24) supportant l'engrenage à pignons (90) dans une position d'engagement par rapport à l'engrenage conique (27);
une barre cylindrique à vis (14) définissant un filetage externe perpendiculaire à l'engrenage conique (27);
un manchon taraudé (21), ayant un filetage interne coopérant avec le filetage externe, qui contacte et entoure une partie de la barre à vis (14), l'une desdites pièces étant attachée à l'engrenage conique (27);
un bélier (16) destiné à être supporté à coulissement à l'intérieur du passage pour bélier (41) et accouplé à l'autre desdites pièces, et un palier de poussée (29) se trouvant dans la cavité interne et interposé entre une surface inférieure d'une pièce de l'engrenage conique (27) et ladite surface inférieure de base (82) pour absorber les forces de poussée transmises par le bélier (16) vers le corps rigide (17), vérin caractérisé en ce que le palier de poussée (29) est un palier plan formé en une matière du type polytétrafluoréthylène.
2. Vérin de levage selon la revendication 1, dans lequel ladite surface inférieure de base (28) comprend une surface sensiblement plane, le vérin de levage comprenant en outre une plaque plane (83) connectée à l'engrenage conique (27) supporté par le palier plan (29), et s'engageant en bas dans la cavité interne (45) en la remplissant sensiblement, dessus la matière à faible friction du palier plan (29) et en contact avec cette dernière.
3. Vérin de levage selon l'une quelconque des revendications précédentes, dans lequel le palier plan (29) est formé par des couches multiples de polytétrafluoréthylène.
EP19850201589 1985-10-01 1985-10-01 Cric à vis Expired EP0216959B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19850201589 EP0216959B1 (fr) 1985-10-01 1985-10-01 Cric à vis
DE8585201589T DE3575411D1 (de) 1985-10-01 1985-10-01 Schraubenwinde.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19850201589 EP0216959B1 (fr) 1985-10-01 1985-10-01 Cric à vis

Publications (2)

Publication Number Publication Date
EP0216959A1 EP0216959A1 (fr) 1987-04-08
EP0216959B1 true EP0216959B1 (fr) 1990-01-17

Family

ID=8194062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850201589 Expired EP0216959B1 (fr) 1985-10-01 1985-10-01 Cric à vis

Country Status (2)

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EP (1) EP0216959B1 (fr)
DE (1) DE3575411D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104803320A (zh) * 2015-04-10 2015-07-29 苏州市职业大学 一种蜗轮蜗杆式升降台
CN108840269A (zh) * 2018-07-12 2018-11-20 安徽思源三轻智能制造有限公司 一种脚踏式汽车用起顶装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5318397A (en) * 1992-05-07 1994-06-07 Junkers John K Mechanical tensioner
JP3019266U (ja) * 1995-03-16 1995-12-12 川崎工業株式会社 スクリュージャッキ
CN102515052B (zh) * 2011-12-07 2013-08-14 中国航天科技集团公司第五研究院第五一〇研究所 一种螺杆式精密升降调整支撑装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1395341A (en) * 1921-05-03 1921-11-01 A O Norton Inc Self-lowering jack
US1698053A (en) * 1926-12-21 1929-01-08 Buda Co High-speed self-lowering lifting jack
GB856612A (en) * 1955-12-20 1960-12-21 Pynford Ltd Improvements in or relating to axial thrust bearings
DE1957857U (de) * 1966-08-23 1967-03-30 Daimler Benz Ag Wagenheber, insbesondere fuer personenkraftwagen.
US3412980A (en) * 1966-10-25 1968-11-26 Walker Mfg Co Floating gear screw jack
US3606252A (en) * 1969-07-15 1971-09-20 Joe Dorough Jr Portable electric automobile jack
US4000880A (en) * 1975-01-27 1977-01-04 Auto Specialties Manufacturing Company Screw jack

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104803320A (zh) * 2015-04-10 2015-07-29 苏州市职业大学 一种蜗轮蜗杆式升降台
CN108840269A (zh) * 2018-07-12 2018-11-20 安徽思源三轻智能制造有限公司 一种脚踏式汽车用起顶装置
CN108840269B (zh) * 2018-07-12 2020-05-22 安徽思源三轻智能制造有限公司 一种脚踏式汽车用起顶装置

Also Published As

Publication number Publication date
EP0216959A1 (fr) 1987-04-08
DE3575411D1 (de) 1990-02-22

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