CN1088684C - Lever hoist - Google Patents

Abstract

The invention provides a lever crane which is prevented of any rainwater and dust, and besives, there is less in the number of part items, simple in structure and capable of making assembling cost be yet more inexpensive. In the inner surfaces of a pair of side plates (3, 4), two chain guides (3a, 4a) preventing any separation of a load chain (19) are integrally made up, and an engaged recess (3b, 4b) to be fitted in an engaged shank (26a) of the lower end of an upper hook (26) is installed in a joined surface where this upper hook (26) is pierced through. In addition, these paired side plates (3, 4) are closed of the peripheral part at both upper and flank sides of a load heave (2) and simultaneously each joined part of these side plates (3, 4) is clamped by a screw member.

Description

Scissors lifter

The present invention relates to a kind of simple structure, assembling easily and also rainwater and dust can not fall into the scissors lifter of carrying pulley and chain guide groove part.

In the scissors lifter in the past, the carrying pulley of axle drive shaft one end is rotated towards the direction that rises or descend, its carrying pulley, chain guide groove and hook are contained between the side plate of pair of plates shape, fix with several staybolts.And, cover the guard shield of carrying pulley outer part and a pair of chain guide groove and side plate separate machined that prevents chain releasing.In addition, hook is associated in together by the top of screw part in the through hole that is inserted in the lower end coupling compoonent and biside plate.

But, remain between the side plate or the lower end coupling compoonent of hook during when guard shield and a pair of chain guide groove and side plate being separated form by screw part and biside plate connection, not only complex structure, use part many, and time-consuming the taking a lot of work of assembling trouble, thereby work efficiency is reduced, and assembly cost increases.

In addition, under the situation with pair of plates shape side plate, because can not avoid around side plate, falling into rainwater and dust, so the time limit that the carrying pulley that side sheet room is being adorned, chain guide groove and hook can move has neatly just shortened to side plate inside.

In view of the foregoing, the purpose of this invention is to provide that a kind of parts are few, simple structure, assembly cost is low and scissors lifter that can water proof and dust proof.

A kind of scissors lifter that the present invention proposes with pair of side plates clamping carrying pulley and chain guide groove, is fixed with screwed part, and detent and drive division are twisted and be combined in from the outstanding drive division of side's side plate, and making operating lever and this drive division is to close; It is characterized in that:

The chain guide groove that prevents chain releasing forms one by pressure forming etc. at the inner face of each side plate, simultaneously, the upside of carrying pulley and the periphery of side is covered by superimposed;

Fix with screwed part for superimposed of each side plate, form on the face of joint that hook connects and the chimeric tying recess of tying axial region that is located on the hook bottom.

In order to improve the packaging efficiency of this device, what form location usefulness by pressure forming etc. on the face of joint of pair of side plates is to close jog.

Because each side plate face within it forms the chain guide groove, the chimeric tying recess of tying axial region of setting and hook bottom so the parts of device have lacked, is constructed also simple on the face of joint that hook connects.Simple structure improves the packaging efficiency of device, and assembly cost also obtains descending.

In addition, each side plate forms and makes the periphery of upside and side obtain the osed top structure, so fixedly the time, the carrying pulley in side plate etc. just can not be subjected to the invasion and attack of rainwater and dust to biside plate with screwed part.

Embodiments of the invention are described with reference to the accompanying drawings, and Brief Description Of Drawings is as follows:

Fig. 1 is the longitudinal diagram of this device;

Fig. 2 is the main position enlarged drawing of Fig. 1;

Fig. 3 is the left side view of Fig. 1;

Fig. 4 is the left side view of Fig. 3;

Fig. 5 is the V-V section-drawing of Fig. 2;

Fig. 6 is the front elevation of side plate;

Fig. 7 is Fig. 6 right side part sectional view;

Fig. 8 is the front elevation of body guard shield (inboard);

Fig. 9 is the right side view of Fig. 8.

2 is carrying pulleys that an end of axle drive shaft 1 forms among the figure, and the axial region 2a of pulley both sides is overlapping bearing on the 2a, and is assemblied in the hole of biside plate 3,4 of configured in parallel.Pulley just can rotate freely like this.

On the axle drive shaft 1 that extends out from side plate 3, begin, be followed successively by the first threaded portion 1a from a side near side plate 3, spline part 1b, the second threaded portion 1c, they are middle the axial region formation by minor diameter respectively.

1a and 1c are right-hand threads.The external diameter of 1a is bigger than 1c's, and the external diameter of spline 1b is then between between them.

On the first threaded portion 1a of axle drive shaft 1, with from the contacted position of axial region 2a of the outstanding carrying pulley 2 of side plate 3, be fixed with pressure-containing member 6 by screw thread.This pressure-containing member forms towards axially outstanding hub portion 6b by the round plate 6a of side plate 3 sides and from this disk central portion, be set with on the hub portion 6b of pressure-containing member 6 two friction means 7 and 8 and the reversing that is clipped between two friction linings prevent to take turns 9.

The first threaded portion 1a at axle drive shaft 1, remove friction means 7 is housed, 8, reversing prevents to take turns 9 and constitute outside the pressure-containing member 6 of detent, also twist close 6 adjacent with pressure-containing member, be provided with the pushing drive element 10 of tying gear 10a at the pars intermedia of outer peripheral face, can advance and retreat vertically.Pushing drive element 10 is important components of drive division, it disposes several for example three circular-arc protuberance 10b on the end face of the hub portion 6b of pressure-containing member 6 side, they are positioned on the same circumference, simultaneously, in the outside of these protuberances 10b, have annular ditch groove 10c along circumference.

The 11st, cover is inserted in the pinch roller on three circular-arc protuberance 10b that push drive element 10, formed a physical efficiency along axle drive shaft 1 advance and retreat by the inner face pushing of circular-arc protuberance 10b and tying, other end tying at the maintenance spring 12 and the pushing drive element 10 of the rear side (the end face side of pushing drive element 10) of pinch roller 11 by an end.

Facing toward of pushing drive element 10 is embedded with the grommet 13 of section for circle among the formed annular ditch groove 10c of end face side of pinch roller 11, the rear side of pinch roller 11 and grommet 13 contact.The 14th, the spring of pushing usefulness, this spring 14 is contained between the circular depressions and three formed circular-arc recesses of circular-arc protuberance 10b by pushing drive element 10 on the end face of the hub portion 6b side that is formed on pressure-containing member 6, makes pressure-containing member 6 and pushing drive element 10 compose gesture towards the direction that is separated.

The spline part 1 of axle drive shaft 1 and the second threaded portion 1c give prominence in the recess 10d that forms on pushing drive element 10 outside end faces, by being inlaid in the packing ring 15 on the spline part 1b and twisting the nut 16 that is combined on the second threaded portion 1c, prevent to push drive element 10 and come off from axle drive shaft 1.

Aforementioned reversing prevents to take turns a direction bevelled tying tooth 9a who is formed with on 9 the peripheral part towards circumference.Ratchet 18 and one of this tying tooth 9a engagement, said ratchet 18 pivots prop up on above-mentioned side plate 3,4, prevent to take turns 9 tying tooth 9a by spring 17 pushing reversings.Because the stopping function of this ratchet 18, making reversing prevent to take turns 9 can only be in the direction of improvement revolution of pulley 2.

Around the upside of the side plate 3,4 of supporting pulley 2 and the side is crooked, so just can covering on every side pulley and the winding chain 19 on it.The flange 3a that forms on the abutted surface of curve, the braking guard shield 20 that 4a and back will be mentioned are together, and be fastening in addition with some screws 21 and nut 22.

For the chain 19 that prevents to be wrapped on the pulley 2 comes off from pulley 2, chain guide groove 3a, 4a is integrally formed on the inner face of side plate 3,4 by pressure forming etc. Chain guide groove 3a, 4a is by forming circular-arc part along pulley 2 and leaving pulley 2 and form towards the chain 19 outstanding circular-arc protrusions of load-carrying side.

Downside at pulley is provided with the heart carrier 23 that has protrusion, and it remains on the side plate 3,4, and protrusion is towards the central part of pulley 2.The 24th, the bonded block that is positioned at heart carrier 23 downsides, side plate 3,4 is combined into one, this bonded block 24 is installed in above-mentioned spring 17 and ratchet 18 from the outstanding axial region of side plate 3.

From pulley 2 to pinch roller 11 foreign side topped a pair of body guard shield 20,20, its at central part of pulley 2 separately, simultaneously, the downside of pulley 2 is open.The flange surface that overlaps with the surface of side plate 3,4 is formed at the top of body guard shield 20,20, they are connected with nut 22 with above-mentioned spiral shell 21 together with side plate 3,4, the bottom of body 20,20 is fixed on the side plate 3,4 by twisting the nut 25,25 that closes with the threaded portion that is formed on above-mentioned bonded block 24 two ends.

In addition, on the faying face of the side plate 3,4 that hook 26 passes through, be formed with and chimeric tying recess 3b, the 4b of tying axial region 26a that is located at hook 26 bottoms, be clipped in hook 26 among tying recess 3b, the 4b by being formed on the engaging part 26b of tying axial region 26a lower end, be maintained in the side plate 3,4.

27 is that an end pivot props up the safety member at the base end part of hook 26, and this safety member 27 is composed gesture towards the direction of inaccessible hook 26 peristomes.Hook 26 is to press against inwards to turn round on the support unit by the part with safety member 27 to carry out toward the installation on the support unit.Support unit one passes through, and then safety member 27 is because of composing force towards the direction revolution of closing hook 26 peristomes, comes off from support unit so can prevent hook 26.The following suspension hook (diagram is omitted) of the safety member with same structure is installed in chain 19 1 sides' bottom.

Being equipped with at the peripheral part that pushes drive element 10 can rotating operating lever 28.Operating lever 28 is made of outer lever guard shield 28a and inboard lever guard shield 28b, it is chimeric pivotally that outer lever guard shield 28a pushes the peripheral part slightly forward of outside leading section of drive element 10 relatively, the portion of end office (EO) of inboard lever guard shield 28b and the interior side superimposed of the peristome of outer lever guard shield 28a, the other end is entrenched between the peristome inboard of the peripheral part that pushes drive element 10 and body guard shield 20 pivotally.

29 are provided in a side of the nut that has the spacer effect concurrently of the upper inner of inboard lever guard shield 28b, and the lever guard shield 28a of the outside and inboard and 28b are by twisting screw 30 fixed upper of closing with nut 29.

In the operating lever 28 that extends towards pushing drive element 10 downsides, taken in gyratory directions and switched pawl 31.This gyratory directions switches pawl 31 by end fulcrum 32 relatively operating lever 28 revolutions outstanding towards the outside of outside lever guard shield 28a.

The 33rd, be contained in the stage clip in the operating lever 28, be pushed to the bottom of the pad 34 pushing gyratory directionss switching pawls 31 of top by stage clip 33.Toward outside outstanding fulcrum 32 handle 35 that the operation gyratory directions switches pawl 31 is being installed from outer lever guard shield 28a.

Gyratory directions switches pawl 31 and can mesh with the tying gear 10a of pushing drive element 10 by handle 35, so that pushing drive element 10 is towards direction of improvement or descent direction revolution, in addition, can also switch to is not the center position that closes with pushing drive element 10, by stage clip 33 and pad 34, remain on each switching position.

In the above-described embodiments, in order to improve the device packaging efficiency, be preferably in the cooperation jog of the face of joint place of pair of side plates 3,4 by the integrally formed location of pressure forming usefulness.

Below, the action of device is described.

Gyratory directions is switched pawl 31 push the drive element tying relatively at direction of improvement.In this state, load remains on down on the suspension hook, reciprocating rotating operating lever 28, the pushing drive element 10 that then moves to pressure-containing member 6 sides by pinch roller 11 with reversing prevent to take turns 9 and the friction means 7,8 of both sides press against on the pressure-containing member 6.

One becomes this state, and pulley 2 turns round towards direction of improvement with pushing drive element 10, so the load that following suspension hook keeps is interrupted the rising along with the reciprocating rotating of operating lever 28.

On the contrary, when gyratory directions is switched pawl 31 switch to descent direction, when making operating lever 28 reciprocating rotatings, pushing drive element 10 courts leave the pressure-containing member direction and move, in this state, pulley 2 and the stubborn pressure-containing member 6 that is combined on the axle drive shaft 1 turn round towards the decline direction because of the load deadweight, and loading is moved towards the decline direction.

But, if axle drive shaft 1 towards the revolution of decline direction, pushes drive element 10 towards pressure-containing member 6 side shiftings, stopping the revolution of axle drive shaft 1, loading remains on this position.

Therefore, if reciprocating rotating control lever 28, loading little by little intermittently descends with safe condition.

Can obtain following effect according to the present invention.

In the lever jack of record, the inner face of pair of side plates integratedly in claim 1 Form the chain guide groove, what the composition surface that hook runs through was formed for the tying hook be End recess, thus with in the past attaching parts and the side plate branch of the sort of two chain guide grooves and suspension hook Do not make with the screw thread stationary device and compare, number of components obviously reduces, and is simple in structure.

Therefore, can improve packaging efficiency, reduce assembly cost.

In addition, pair of side plates covers the periphery of the upside of pulley and side, their joint The face screw fastening is not so the pulley and the chain that are contained in the side plate just can be subjected to rainwater and ash The invasion and attack of dirt, thus device can be moved for a long time neatly.

The device of recording and narrating in the claim 2, it molds the location simultaneously at the joint of side plate Jog is so packaging efficiency and assembly cost can both be further improved.

Claims (2)

1. scissors lifter with pair of side plates clamping carrying pulley and chain guide groove, is fixed with screwed part, and detent and drive division are twisted and be combined in from the outstanding drive division of side's side plate, and making operating lever and this drive division is to close; It is characterized in that:

The chain guide groove that prevents chain releasing forms one by pressure forming etc. at the inner face of each side plate, and the upside of carrying pulley and the periphery of side are covered by superimposed;

Fix with screwed part for superimposed of each side plate, form on the face of joint that hook connects and the chimeric tying recess of tying axial region that is located on the hook bottom.

2. the scissors lifter described in claim 1 is characterized in that, what form location usefulness by pressure forming etc. on the face of joint of pair of side plates is to close jog.

Images