CN101374755B

CN101374755B - A scissor jack

Info

Publication number: CN101374755B
Application number: CN2006800443677A
Authority: CN
Inventors: C·克里斯蒂
Original assignee: NIEKERK NORMAN JULIUS VAN
Current assignee: NIEKERK NORMAN JULIUS VAN
Priority date: 2005-11-28
Filing date: 2006-11-27
Publication date: 2011-04-13
Anticipated expiration: 2026-11-27
Also published as: ZA200804579B; CN101374755A

Abstract

The invention involves a scissor jack (1) having four arms (4,5,6,7) hingedly arranged to provide two opposite elbows (8) between a base (2) and a load support (3). A pair of trunnions (9,10) at the elbows (8) is connected by a threaded shaft (12). A movable brace (40) is supported between the arms (4-7). The brace (40) strengthens and adds support to the jack assembly (1). In a preferred embodiment, the brace (40) includes a guide assembly (30) which slidably engages the shaft (12) and connectors (41) pivoted between the guide (30) and each of the four arms (4,5,6,7). The connectors (41) are extensible socket (36) and rod (29) arrangements. Each connector (41) includes a coil spring (37) located over the rod (29) in the socket (36). The four springs (37) are compressed on extension of the jack (1) to assist in lifting a load.

Description

Scissors-type jack

Technical field

The present invention relates to the improvement structurally of a kind of scissors-type jack.

Background technology

Scissors-type jack is known and is widely used in the lifting vehicle.This jack is also referred to as spiral jack sometimes.It designs substantially with operating principle and has been employed a period of time.

In the improvement of being done on these jacks generally is to carry out on the threaded shaft or on the gudgeon that this threaded shaft is connected on the parts.In order to need sizable application force with these jack lifting loads, perhaps in other words, with lifting rate (lifting rate) thus reduce the demand of power.

They bear more serious mechanical strees usually when jack operation in the open air.These will increase the possibility of parts recurring structure damage.

When heavy-duty vehicle need carry out lifting, low and these problems of mechanical breakdown of lifting efficient will seriously be changed.Except some the large-scale 4Wdvehicle of selling on the market, the military also uses heavy-duty vehicle usually.

Summary of the invention

The purpose of this invention is to provide a kind of scissors-type jack, alleviate variety of problems above-mentioned to small part.

According to a kind of scissors-type jack provided by the invention, it comprises four hinged arms, they form two relative ancons between pedestal and load support, a pair of gudgeon on ancon connects by threaded shaft, and have the mobile stool that is supported between the described arm.

The present invention also is arranged to carriage to comprise the guide that engages slidably with described axle and the adaptor union of pivotal joint between guide and each arm in four arms.

Further feature of the present invention comprises to be arranged to this adaptor union can stretch; Each adaptor union all has a spring, and it is compressed when jack stretches; Each adaptor union all has sleeve and bar structure, is positioned with a coil spring on the bar in sleeve.

Description of drawings

These and other feature of the present invention will only be described by the mode of embodiment in conjunction with relevant drawings, wherein:

Fig. 1 is first transparent view of scissors-type jack;

Fig. 2 is second transparent view; And

Fig. 3 is the cross sectional front elevation of jack.

The specific embodiment

Referring to accompanying drawing, the scissors-type jack described in the present invention is marked by Reference numeral (1) usually.This jack (1) has pedestal (2) and load support (3).Four movably arm (4), (5), (6) and (7) are between above-mentioned parts, and this is a kind of common structure for this jack.

Go up fluting in arm (4), (5), (6) and (7) and assemble some pin and two gudgeons, thereby each parts of jack are assembled together.

Arm (4), (5), (6) and (7) are formed two knuckle joint portions (8), and each knuckle joint portion all distinguishes hinged formation by gudgeon (9) and (10) with arm (4) and (6) and arm (5) and (7).Wherein gudgeon (10) has internal thread hole.This screw thread and the mutual coupling of the screw thread (11) on the axle (12), the gudgeon (10) that has a screw thread by axle (12) interconnects with another gudgeon, and this gudgeon flange (13) that to be driven gudgeon (9) with smooth holes be positioned on the axle (12) is used to prevent that it from passing through driven gudgeon (9).

Near the operation end (14) of flange (13) that is positioned at of axle (12) is used for holding throw or handle (not illustrating in the drawings).The plat part that operation end (14) shown in the figure has the hexagonal head of being provided with.This head (14) can be contained in the pod with corresponding shape on the parts of crank rotating handles (cranked turning handle) normally.In addition, this head also can have one through wherein eyelet, is used for connecting hook.

Pedestal (2) has a pair of projection spaced apart from each other (15).Underarm (4) and (5) pivot are fixed on the susceptor pin (16) of extending between the projection (15).The pivotally attached bottom of arm (4) and (5) is determined by the tooth that is bonded with each other (17) at the profile near pedestal (2) one sides.These ends and tooth (17) are reinforced by plate (18), and it has corresponding profile so that be fixed on the flange inner of fluting.Upper arm (6) and (7) are connected on the projection (20) on the load support (3) by pin (19) equally.Upper arm (6) also is being provided with tooth (21) and reinforced plate (22) with identical configuration mode with (7) with bearing support (3) pivotally attached position.

Flange (13) is contained in the inboard of the head (14) of axle (12).A thrust baring (23) and packing ring (24) abut against on the flange (13).This packing ring (24) is positioned at the outside of driven gudgeon (9).Relative, be provided with another packing ring (25) on the axle (12) in the inboard of driven gudgeon (9).The spring cotter (26) that passes axle (12) is fixing with packing ring (25), thereby axle (12) is kept in position, overcomes its longitudinal travel with respect to driven gudgeon (9).As mentioned above, this axle (12) rotation freely by the suitable rotary handle of operation.Axle (12) has screw thread from its free end (27) to the part of closing on driven gudgeon (9).

Other feature that further describes of jack (1) is normally known.According to the present invention, jack (1) has a mobile stool (40), is supported between arm (4), (5), (6) and (7).

Each arm (4), (5), (6) and (7) all have the through hole of a pair of aligning, are used to hold the guide finger (28) that passes its slotted flange.The bar (29) fixing by these pins (28) inwardly extends to guidance set (30) always.Bar (29) begins to extend from having the substrate that pore structure (32) are arranged (31) that holds pin (28).Guidance set (30) comprises two side plates (33) that are essentially rectangle, and each side plate has independently hole, four intervals, and described hole lays respectively on the circular projection (33.1) of rectangle folding corner region.Four pins (35) pass plate (33).Pin (35) adapter plate (33) also is separated from each other it, and above and below cover plate (34) is fixed between them.Outward extending from each pin (35) is sleeve (36).The through hole that runs through the aligning of sleeve wall is equipped with pin (35), thus with four sleeves (36) pivotal joint between plate (33).As shown in the figure, bar (29) places sleeve (36).Four coil springs (37) are enclosed within bar (29) and go up and place respectively cooresponding sleeve (36).These bars (29) and sleeve (36) structure with spring (37), are formed the telescopic adaptor union (41) that is used for mobile stool (40).

Be encapsulated between plate (33) and (34) is elongated guide (38).This guide (38) has a level and smooth longitudinal hole (39), is used to hold threaded shaft (12), as shown in the figure.This guide (38) preferably is made of oil base nylon or other similar self-lubricating material.The flat head screw (not shown) is passed cover plate (34) so that guide is fixed on the appropriate location.When operation jack when (1), this guide (38) is used to keep the relative position relation between guidance set (30) and spool (12).The such configuration mode of carriage (40) and its adaptor union (41) can be realized from centering.

Gudgeon (9) and (10) have a pair of nyliner (9.1) and (10.1) respectively.Lining is near the slotted flange in the knuckle joint portion (8).

In use, axle (12) rotation makes screwed gudgeon (10) move along axle (12), thereby gudgeon (9) and (10) are furthered mutually.Bearing support (3) moves to the direction away from pedestal (2), is generally used for vehicle (not illustrating in the drawings) is lifted from ground.

Arm during the lifting operation (4), (5), (6) and (7) pivoted, ancon (8) stretches, and carriage (40) is reinforced jack (1).When these took place, the distance between ancon (8) and the guidance set (30) reduced.Select gudgeon (9) and (10), this configuration structure of guide finger on arm (28) and guidance set (30), thereby when jack (1) when entering extended configuration, compression connector spring (37).Compressed spring (37) has strengthened the rigidity of structure.When ancon (8) to guiding assembly (30) when mobile, the outside power that compressed spring (37) is applied helps jack (1) to stretch with the lifting load.

The adaptor union (41) of each side of guidance set (30) forms acute angle each other.This angle is along with jack (1) stretches, and spring (37) is tending towards upright shape and increases.This means that spring (37) applies the mechanical assistance effect draw to an end thereupon, when the car body of vehicle is engaged, and when being in the stage that is raised, this situation is desirable.

Susceptor pin (16.1) near axle (12) operation end (14) one sides preferably is arranged to be slightly higher than another pin (16.2) in projection (15).To cause like this stretching when jack (1), bearing support (3) slightly curvedly moves up during away from the operation end (14) of axle (12).This bearing support is along with car body one vehicle offside wheel direction inclination in the same way.The vertical lifting of jack must cause their basement tilt, and this can cause it to skid off under car.This point is especially outstanding when operation ground is not firm or uneven in the open air.In order to make bearing support (3) do arcuate movement, also can allow one of them arm slightly than other brachium.The selection of suitable spring (37), the setting of amount of spring compression and relate to mobile stool (40) and other of adaptor union (41) changes all in those skilled in the art's designed capacity.Being appreciated that coil spring can be substituted by other spring, also can be hydraulic pressure or gas-pressure component.The spring of lightweight can be selected, and it is mainly in supporting but not auxiliary lifting.

In optional embodiment, carriage forms by the plate of regular length is hinged.Four connector boards extend internally from each arm respectively.These plates together are connected on the 5th center plate.This five interconnective symmetrical configuration of plate are arranged between the slotted flange of jack both sides.Two center plates can interconnect and guide by a slide block that engages slidably on axle.Time pin stretches and all remains unchanged during indentation at jack with the distance between the pin that is used in each connector board selecting on the arm and in the installation site on the center plate.Such carriage can not still can play the effect of reinforcement feature according to auxiliary stretching, extension of the such mode of first embodiment that has stated.

Carriage also can be made of a pair of elongated plate, and they extend to cooresponding upper arm and extend to another upper arm at opposite side from another underarm from a underarm in a side of jack respectively.In addition, the coffin with a corpse in it axle bonded assembly pin on slotted flange is installed and is gone up in place, to reinforce jack.

Be understandable that and can adopt other configuration mode, its medi-spring is compressed by mobile stool.For example, the adaptor union of pivotal joint has fixing length and is fixed on the centre pilot assembly divided into two parts, wherein each part all can with the axle slide joint.Spring can place between two parts the axle on.This mounting means will make spring be compressed when jack carries out the lifting operation.

It should be understood by those skilled in the art that based on the technical characterictic of stating jack, in the case without departing from the scope of protection of the present invention, can obtain multiple other modification.Such as, carriage can be positioned at the front and/or rear spaced positions with jack, and needn't inwardly directly extend from slotted flange.

Claims

1. scissors-type jack comprises: four arms, and described arm is hinged to form two relative ancons between pedestal and load support, and a pair of gudgeon connects at each ancon place and by threaded shaft respectively; It is characterized in that described jack comprises mobile stool, described carriage engages the described threaded shaft between the described arm slidably, is supported with adaptor union pivotly between described carriage and each arm.

2. jack according to claim 1, wherein said adaptor union is telescopic.

3. jack according to claim 2, wherein each described adaptor union has spring, and described spring is compressed when jack stretches.

4. jack according to claim 3, wherein each adaptor union all has sleeve and bar structure, is positioned with coil spring on the described bar in described sleeve.