WO2013035063A1 - Cric à pantographe - Google Patents

Cric à pantographe Download PDF

Info

Publication number
WO2013035063A1
WO2013035063A1 PCT/IB2012/054613 IB2012054613W WO2013035063A1 WO 2013035063 A1 WO2013035063 A1 WO 2013035063A1 IB 2012054613 W IB2012054613 W IB 2012054613W WO 2013035063 A1 WO2013035063 A1 WO 2013035063A1
Authority
WO
WIPO (PCT)
Prior art keywords
collar
shaft
scissor jack
trunnions
head
Prior art date
Application number
PCT/IB2012/054613
Other languages
English (en)
Inventor
Colin Christie
Original Assignee
Colin Christie
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 Colin Christie filed Critical Colin Christie
Publication of WO2013035063A1 publication Critical patent/WO2013035063A1/fr

Links

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
    • B66F3/12—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated comprising toggle levers

Definitions

  • This invention relates to a scissor jack and more particularly to improvements to such a jack.
  • a scissor jack comprising four arms hingedly arranged to provide two opposite elbows between a base and a load support, a threaded shaft providing a journal rotationally constrained at one of the elbows with a working end of the shaft adjacent the journal secured to a rotation mechanism and a first collar provided at the other elbow secured over the threaded shaft by a pair of trunnions located through the arms and supporting a ball screw assembly in engagement with threads on the shaft.
  • the invention further provides for the jack to include a brake mechanism to resist rotation of the shaft; and for the brake mechanism to be a friction brake mechanism.
  • the ball screw assembly has a cylindrical body housed at least partly within the first collar and a flange that is secured against a face on an outer side of the first collar; and the elbow remote from the ball screw assembly which has a second collar located over the journal on the shaft by a pair of trunnions engaging the arms, the second collar providing an outer annular shoulder for a head on the working end of the shaft to bear against and the second collar supporting a mounting bracket for a planetary gearbox, extending around the head.
  • a brake mechanism is fitted between a planetary gearbox and a universal joint; the trunnions have screw-threaded spigots at their inner ends which engage in screw-threaded holes in either side of the first and second collars; a thrust bearing is provided between the head of the shaft and the shoulder of the second collar; and the journal adjacent the head is fitted with a bush located inside the second collar.
  • a jack as defined in which the head is in overlapping splined engagement with an output gear of the planetary gearbox; in which the trunnions have screw-threaded spigots at their inner ends which engage in screw-threaded holes in either side of the first and second collars; and each of the trunnions has a journal which locates in corresponding openings at the elbows of the arms and a head at its outer end which locates against the arm.
  • Figure 1 shows an exploded perspective view of a scissor jack
  • Figure 2 shows a cross section through the jack and a detail of the planetary gearbox mounting arrangement
  • Figure 3 shows a side cross-section and perspective view of a first collar and mounting for a ball screw assembly
  • Figure 4 shows a perspective view of a second collar and mounting for a planetary gearbox
  • Figure 5 shows a side view of a trunnion
  • Figure 6 shows a schematic side view of a brake mechanism
  • Figure 7 shows the components of the braking mechanism.
  • a scissor jack (1 ) has a base (2) separated from a load support (3) by two pairs of arms (4.1 ) to (4.4).
  • the pairs of arms (4) each has at its connecting elbow (5) and (6) a pair of trunnions (7) and (8).
  • the arms (4) are made up by four plates bent to have a channel profile as shown in the drawings.
  • the free ends of the arms (4) are geared to move in unison by gear sections (9) and (10). These sections are supported on both the base (1 ) and load support (3) by pins (1 1 ).
  • the channel flanges (12) are cut to provide the gear sections (9) and (10) and have reinforcing pates (13) with matching gear sections.
  • the flanges (12) are also perforated to accommodate the pins (1 1 ) and with openings (14) to receive the trunnions (7) and (8) at the elbows (5) and (6.
  • the trunnions (7) at the one elbow (5) are secured to a first collar (15).
  • the trunnions (8) at the other elbow (6) are secured to second collar (16).
  • Both the collars (15) and (16) are provided with flats (17) at their sides - the flats are received between the flanges (12) of the upper arms (4.2) and (4.4).
  • a threaded shaft (18) extends through the first collar (15) and second collar (16).
  • the shaft (18) is of the kind used with a ball screw assembly (19).
  • the assembly (19) has a cylindrical body (20) which is housed inside a bore of the first collar (15).
  • a flange (21 ) on one end of the body (20) locates against a corresponding face (22) on the outer side of the first collar (15).
  • the flange (21 ) has holes for screws (23).
  • Corresponding holes (24) provided in the face (22) of the first collar (1 5) are screw-threaded for engagement by the screws (23). This arrangement securely locates the ball screw assembly (19) to the first collar (15).
  • the inner portion of the second collar (16) to which the trunnions (8) are secured is similar in configuration to the first collar (15). Both have the same flats (17) on their sides with screw-threaded holes (26) for the trunnions (7) and (8) provided at the flat surfaces.
  • the trunnions have correspondingly screw-threaded spigots (27) at their inner ends which engage in the holes (26).
  • the trunnions (7) and (8) are outwardly stepped from the spigots (27) to provide a journal (28) of increased diameter.
  • the journal (28) engages in the corresponding openings (14) at the elbows (5) and (6) of the arms (4).
  • Each trunnion (7) and (8) has a head (29) at its outer end.
  • This is provided by a cylindrical extension (32) with a square mounting plate (33) provided at its free end.
  • the second collar (16) has a bore which is outwardly stepped to provide a shoulder (34).
  • the working end of the shaft (18) is screw-threaded at (35) for engagement with a head (36).
  • a shaft journal (37) extends between these threads (35) for the head (36) and those which extend along the shaft (18) for engagement with the ball screw assembly (19). Before the head (36) is screwed in place, the shaft journal (37) is fitted with a bush (38).
  • the bush (38) has a flange (39) which engages against the inner end of the second collar (16).
  • the journal (37) is of smaller diameter than a shoulder (40) on the shaft (1 8) adjacent the main threads. This retains the bush (38) on the journal (37) inside the second collar (16). This also prevents the head (36) on the shaft (18) from being pushed into the gearbox (31 ) when the jack (1 ) is being lowered.
  • a thrust bearing (41 ) is located between the head (36) and the shoulder (34) on the second collar (16).
  • the bearing (41 ) includes a needle roller assembly (42) located between two thrust washers (43).
  • the gearbox (31 ) has a square base (44) with four holes (45). This corresponds to the mounting plate (33) which also has four holes (46). Nuts and bolts (47) are used to hold these components together.
  • the head (36) is in overlapping splined engagement with an output gear (48) inside the gearbox (31 ). This is effected by a protrusion (49) on the head (36) which fits into an opening in the gear (48) by means of engaging splines.
  • the gearbox (31 ), in this embodiment, is operated by a cranked handle (not shown).
  • the handle provides a mechanism whereby rotation is transmitted to the shaft (18) through a universal joint (50).
  • the ball screw assembly (1 9) is moved in either direction along the shaft (18).
  • the jack (1 ) is extended or retracted in the usual manner but with much greater efficiency.
  • the first collar (15) and second collar (16) provide structural features which enable the compact and convenient incorporation of the ball screw assembly (19) and planetary gearbox (31 ) within a scissor jack construction.
  • the trunnions (7) and (8) will be torqued against unintentional release into the openings (26) of the first collar (15) and second collar (16).
  • These components can also be welded to prevent unintentional removal of the trunnions (7) and (8). In the case of the latter, the welding can be cut to disassemble the components for repairs or replacement of parts.
  • the jack assembly will be provided with a suitable brake mechanism.
  • a suitable brake mechanism may be of the type illustrated in Figure 6.
  • the brake mechanism (51 ) is fitted between the planetary gearbox (31 ) and the universal joint (50). It may conveniently consist of a cap (52) engaging over an annular lip (53) on the gearbox housing.
  • a coned disc spring (54) is located to exert a controlled frictional pressure through a bush (55), preferably of suitable self-lubricating material.
  • the bush (55) is biased by the spring (54) against the lip (53).
  • the bush (55) has oppositely disposed lugs (56) that locate in grooves (57) in the cap (52). This prevents rotation of the bush (55) relative to the cap (52).
  • the brake mechanism arrangement (51 ) serves to ensure that the jack will be kept stationary once a lift has been completed.
  • the cap (52) is provided with a pair of aligned holes for a locating pin (58). This holds the cap (52), spring and bush (55) against the lip
  • a suitable screw threaded tightening mechanism can be provided to adjust the frictional pressure of the brake mechanism.
  • an alternative brake mechanism may be provided. This could be a ratchet, for example.
  • the brake mechanism could also for example be incorporated in a rotation mechanism that is connected to rotate the input shaft of the jack (1 ).
  • the jack (1 ) could be constructed with two collars substantially the same as the first collar (15) and some other arrangement for the mounting of the planetary gearbox (31 ) or without such a gearbox.
  • a person skilled in the art will appreciate that a number of variations may be made to the features described without departing from the scope of the current invention.

Landscapes

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

Abstract

L'invention porte sur un cric à pantographe (1), lequel cric comprend quatre bras (4) agencés de façon articulée de façon à constituer deux coudes opposés (5, 6) entre une base (2) et un support de charge (3). Un premier collier (15) disposé au niveau de l'un des coudes supporte un ensemble de vis à billes (19) en prise avec des filetages sur l'arbre (18). Le cric (1) comprend un mécanisme de frein (51) pour résister à la rotation de l'arbre (18). L'ensemble de vis à billes (19) a un corps cylindrique (20) renfermé au moins partiellement à l'intérieur du premier collier (15) et une bride (21) qui est fixée contre une face (22) sur un côté externe du premier collier (15). L'autre coude a un second collier (16) disposé sur le pivot sur l'arbre (18). Le second collier (16) supporte un support de montage (30) pour une boîte d'engrenages planétaires (31). Des tourillons (7, 8) à goujons filetés (27) à leurs extrémités internes s'engagent dans des trous filetés (26) de chaque côté des premier et second colliers (15, 16). Les tourillons (7, 8) ont chacun un pivot (28), qui se positionne dans des ouvertures correspondantes (14) au niveau des coudes (5, 6) des bras (4) et une tête (29) à son extrémité externe, qui se positionne contre le bras (4).
PCT/IB2012/054613 2011-09-09 2012-09-06 Cric à pantographe WO2013035063A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201101835 2011-09-09
ZA2011/01835 2011-09-09

Publications (1)

Publication Number Publication Date
WO2013035063A1 true WO2013035063A1 (fr) 2013-03-14

Family

ID=47831602

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2012/054613 WO2013035063A1 (fr) 2011-09-09 2012-09-06 Cric à pantographe

Country Status (1)

Country Link
WO (1) WO2013035063A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018127758A1 (fr) 2017-01-05 2018-07-12 TRUTER, Phillip James Cric à pantographe
CN111483938A (zh) * 2020-04-23 2020-08-04 常州大学 连杆扩力千斤顶
GB2584778A (en) * 2019-06-03 2020-12-16 Snap On Tools Corp Trunnion Block Assembly
CN112249954A (zh) * 2020-10-16 2021-01-22 南京静燕家居有限公司 一种稳定性高且方便使用的新能源汽车用剪式千斤顶
CN113104761A (zh) * 2021-05-14 2021-07-13 潍坊工程职业学院 一种便于汽车用维修设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716537A (en) * 1949-06-08 1955-08-30 Gen Motors Corp Scissors jack
JP2003095586A (ja) * 2001-09-21 2003-04-03 Kanji Tomidokoro ボ−ルネジ機構を用いたパンタグラフ式倍力装置の操作方法並びに製造方法
US20100065795A1 (en) * 2006-11-27 2010-03-18 Quaddro Technologies (Pty) Ltd Scissor jack

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716537A (en) * 1949-06-08 1955-08-30 Gen Motors Corp Scissors jack
JP2003095586A (ja) * 2001-09-21 2003-04-03 Kanji Tomidokoro ボ−ルネジ機構を用いたパンタグラフ式倍力装置の操作方法並びに製造方法
US20100065795A1 (en) * 2006-11-27 2010-03-18 Quaddro Technologies (Pty) Ltd Scissor jack

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018127758A1 (fr) 2017-01-05 2018-07-12 TRUTER, Phillip James Cric à pantographe
CN110382398A (zh) * 2017-01-05 2019-10-25 科林·克里斯蒂 剪式千斤顶
EP3565779A4 (fr) * 2017-01-05 2020-09-02 Colin Christie Cric à pantographe
GB2584778A (en) * 2019-06-03 2020-12-16 Snap On Tools Corp Trunnion Block Assembly
GB2584778B (en) * 2019-06-03 2021-10-27 Snap On Tools Corp Trunnion Block Assembly
US11584625B2 (en) 2019-06-03 2023-02-21 Snap-On Incorporated Trunnion block assembly
CN111483938A (zh) * 2020-04-23 2020-08-04 常州大学 连杆扩力千斤顶
CN112249954A (zh) * 2020-10-16 2021-01-22 南京静燕家居有限公司 一种稳定性高且方便使用的新能源汽车用剪式千斤顶
CN112249954B (zh) * 2020-10-16 2021-12-17 周建威 一种稳定性高且方便使用的新能源汽车用剪式千斤顶
CN113104761A (zh) * 2021-05-14 2021-07-13 潍坊工程职业学院 一种便于汽车用维修设备

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