CN1141877A - Safety device for preventing elevator from falling down - Google Patents

Abstract

The safety device preventing slipping down includes: two shells are connected mutually and spaced at a certain distance, each flange rotated on the inner side of the described shell by means of common rotating shaft at least moves between two working positions, and at least lwo spacing blocks are used for braking the described flexible cable and stopping it, the described cable can be slided along the neck of the pulley from a suspended middle position, so that it can make operator or load lift up or glide along the flexible cable to make overhead operation.

Description

Safety device for preventing elevator from falling down

The present invention relates to a kind of safety device for preventing elevator from falling down, relate in particular to a kind of staff of being used on certain altitude or clinoplane, the safety device for preventing elevator from falling down in ladder, support, passage, roof and well face or the well for example, this device can make staff or load-carrying, and for example hawser, strand cable or belt rise or descend along flexible cable.

According to the situation of using fixed connection point or flexible connection point, described safety device for preventing elevator from falling down can be divided into two big main types.

The device of the first kind is used for linking to each other with the attachment point on the certain altitude, and by the movable hawser of being furnished with in the device staff or load-carrying and this device is connected together.

In this type, people recognize that the device on the up-coiler is furnished with a hawser, and this hawser one end is linked on the cylinder and reeled thereon, and the other end of hawser is fixed on staff's for example the safety strap.Under the situation that the staff glides, by the centrifugal force controlled latching device, described latching device interrupts the unwinding of hawser and the personnel's that quit work immediately downslide.

This device has many defectives, and especially owing to directly link to each other with cylinder, so the hawser danger that fracture arranged or be worn, this device is not complementary with a use that flexibly connects, and weight is too big.In addition, when the staff unclamped with its hawser that directly links to each other one end, this hawser was got back on the device by retracing spring, and the staff no longer includes the chance of any operative installations.

Use both direction slip or the rolling of the device of second type that flexibly connects point along hawser, the staff for example links to each other with the underframe of device by safety strap.

People recognize, such device can be implemented braking to hawser by the clip of fluting, and described fluting clip glides the back because swing and just clamp hawser the staff.

But this device is safety inadequately, even dangerous, because be that the fluting clip is no longer swung as described above owing to staff's downslide, therefore can not realize braking with installing situation about often occurring when the staff who links to each other glides.

In addition, this device can only be along one-way only operation, if this device is installed along the unfavorable direction of hawser, this just constitutes dangerous so.

People recognize another kind of means, this device can be along its either direction work of installing on hawser, described device is made of two flanges, the pulley of an energy towards any direction rotation is housed between two flange surfaces, have the recessed neck of an annular arrangement on it and be used to admit flexible rope, locking piece forms on pulley and flange surface respectively, rotate and freely rotate and the centnifugal force that produces during with convenient pulley above the numerical value of predetermined threshold at the reverse situation lower sheave, the optionally relative rotational lock of above-mentioned pulley with flange, in the downslide situation, because hawser has been placed in the recessed neck of pulley, the application force that produces in downslide by hawser obtains braking, and the special profile of the recessed neck of pulley is used for hawser is implemented to clamp.

But any device of this second type can not be applicable to the use fixed connection point.

The objective of the invention is to remedy above-mentioned defective, the safety device for preventing elevator from falling down that proposition is operated along both direction, safety performance is fabulous, avoid any breakage of hawser, be applicable to and use fixed connection point or flexibly connect point, be easy to release, in light weight, make simple and easy and expense is low.

For this reason, safety device for preventing elevator from falling down of the present invention comprises at least one flange, inboard at above-mentioned flange is equipped with the pulley with the recessed neck of ring-type, the recessed neck of described ring-type is used to admit flexible rope, locking piece forms on the surface of above-mentioned pulley and above-mentioned flange respectively, when pulley rotates and freely rotates and the centnifugal force that produces during above the numerical value of predetermined threshold at the reverse situation lower sheave, described locking piece is used for optionally making the relative rotational lock with flange of pulley, it is characterized in that, said apparatus also comprises two shells that are connected with each other and are certain intervals, described flange and pulley rotate in the inboard of above-mentioned shell by common axis of rotation, its feature also is, each flange is suitable for moving between at least two bevelled control positioies, wherein, at least two limiting stoppers be disposed at respectively described flange and described shell around, be used for making above-mentioned flexible rope braking and stand by the mode that for example clamps or lock, described flexible rope recessed neck along described pulley in the midway location of a time-out slides.

In apparatus of the present invention, the locking of pulley is fitted to each other by different members with the braking of flexible rope and is implemented.

Under the situation of staff or load-carrying downslide, can brake flexible rope as the flange of movable limiting stopper.

According to feature of the present invention, each flange for example retracts towards above-mentioned time-out position with the spring that flange links to each other with shell by return springs, and this just can make the device after gliding be easy to release, and any locking that should not take place appears in holdout device.

Be preferably, apparatus of the present invention comprise by plurality of cross bars and link to each other and be two flanges of certain intervals each other that include above-mentioned pulley therebetween in, this flange rotates with respect to the shell rotation.

The further feature according to the present invention, limiting stopper are configured in the both sides of the flexible rope section that will brake, and when each flange was mobile towards one of some control positioies, above-mentioned limiting stopper was locked it.

In other words, one is movable in two limiting stoppers, and another is fixed, the two is on its supporting member separately, when each flange was mobile on control position, for example the profile by cam or in the mode of flexible-disc joint abutted in movable limiting stopper on the fixed limit piece, this just makes movable limiting stopper move, and is clamped in the flexible rope section that will brake between recessed neck of pulley and the above-mentioned movable limiting stopper.

Apparatus of the present invention are also included within the some members on above-mentioned shell and the above-mentioned flange, are used to limit flange moving on control position, are particularly useful for avoiding the breakage of flexible rope and fractureing, and these spacing members can be configured on the aforementioned limiting stopper.

According to the embodiment of the invention, guide is cylinder, small sheave or fixed transverse rod for example, they are installed in device near between the shell in two opposite sections of flexible rope exit, almost be configured in the both sides of pulley, using under the situation that flexibly connects point, be used for along almost linearly direction or vertical direction flexible rope is led, and above-mentioned flexible rope is remained on the device.

According to another embodiment of the present invention, guide is installed between the crust of the device in two opposite sections of flexible rope exit, is configured in the homonymy of pulley and close to each other, is using under the fixed connection point situation, and flexible rope almost takes the shape of the letter U.

The further feature according to the present invention, described device comprises indicating instrument, this indicating instrument can be regulated the position of above-mentioned limiting stopper and/or above-mentioned guide, so that can use same device under the situation that flexibly connects point or fixed connection point.

The further feature according to the present invention, limiting stopper and/or guide belong to the predetermined moulded parts that cuts shape that is, and they go for same device by aforementioned indicating instrument.

Apparatus of the present invention can comprise movable counterweight and brake component, and described counterweight is at an end of flexible rope, and described brake component remains on counterweight on the flexible rope under the situation of applied external force not having.

The further feature according to the present invention, described device can comprise that at least one forms the member of scraper, be installed on the device near the exit of at least one section in two opposite sections of flexible rope, so that the relevant section of cleaning flexible rope, the member of this formation scraper constitutes by for example helix and with the coaxial rigid metal silk of the section of the above-mentioned flexible rope that will clear up.

Reach unrestricted embodiment with reference to the accompanying drawings, can do further understanding to the present invention, accompanying drawing is as follows:

Fig. 1 is used to use the device of fixed connection point along the elevation cross-sectional view perpendicular to the coaxial central plane of rotation in the first embodiment of the invention.

Fig. 2 is the control position figure of the device shown in Fig. 1.

Fig. 3 is the part sectional view along apparatus of the present invention of III-III line among Fig. 1.

Fig. 4 is the scheme drawing of the pulley locking piece of apparatus of the present invention.

Fig. 5 to Fig. 9 is the scheme drawing of the different modification of the device described in Fig. 1.

Figure 10 A and Figure 10 B are respectively the lateral plan and the upward views of part among Fig. 9.

Figure 11 is used to use the device that flexibly connects point along the elevation cross-sectional view perpendicular to the coaxial central plane of rotation in the second embodiment of the invention.

According to the embodiment shown in Fig. 1, safety device for preventing elevator from falling down is used for being suspended in the attachment point of certain altitude by suspend ring or snap hook 2 (shown in Fig. 3,7,8), and with thick rope 3 swivel bearings of activity in said apparatus inside.

Obviously, thick rope 3 can be substituted by the so any flexible rope that is suitable for of for example hawser, belt or loop chain.

Thick rope 3 around movable sheave 4 local volumes around, as shown in Figure 1, two end opposite of thick rope 3 are almost stretched out from central pulley 4 homonymies abreast, shape takes the shape of the letter U.

End in the two ends of thick rope 3 be used for for example will on the staff or the load-carrying of going down link to each other, the other end of thick rope then is used for supporting the flatness of guaranteeing thick rope 3 and the counterweight (not shown) that keeps its tension force, or is used for carrying out M/C by other staff.

Pulley 4 is installed in rotation between two flanges, and by common axis of rotation 7, above-mentioned two flanges rotation itself is installed between the two boards that forms shell 6.

The framework of shell 6 constituent apparatus, described shell is arbitrary shape, can make thick rope access to plant.

Pulley 4 comprises the recessed neck 8 of the annular arrangement of admitting thick rope 3.The cross section of the recessed neck 8 of annular arrangement is semi-round, the shape that takes the shape of the letter U or be the Any shape that is suitable for admitting flexible rope.

In device 1 exit, two opposite sections of thick rope 3 for example slide on cylinder or the small sheave at guide 9 respectively, and the interval of these two guides 9 is less than the diameter of pulley 4.

Two flanges 5 are connected with each other by pulley 4 exterior cross bars 10, and two shells 6 also are connected with each other by the exterior cross bar 11 of flange.

Link respectively on flange 5 and the shell 6 at spring 12 two ends.Because flange 5 retracts the midway location of time-out by the elastic recovering force that is produced by described spring 12, so flange 5 can not freely rotate around axle 7.

Be preferably, by the elastic type that pivots, spring 12 is connected on another root cross bar 11 on the shell 6 cross bar 10 on the flange 5.

The rotation direction of pulley 4 is illustrated by two arrows.

The connecting element that forms limiting stopper 13 is contained between the surface of flange 5, is configured between two opposite ends outside and slightly rope 3 of pulley 4, almost the front of contact area between pulley 4 and thick rope 3.

Described fixed limit piece 13 is with flange 5 co-rotation between above-mentioned two bevelled control positioies (one of them is shown in Figure 2) together, wherein, match one of in fixed limit piece 13 and the above-mentioned cross bar 11, be used for just a section of thick rope 3 being locked and being clamped, so that thick rope 3 is therebetween braked.

Fixed limit piece 13 has two toothed (see figure 1) symmetroids of possibility, is used for flange 5 and just clamps thick rope 3 when its control position moves.

According to Fig. 1 and Fig. 2 as can be seen, flange 5 is furnished with claw hook 14, and described claw hook 14 is fully outwards outstanding on the plane of flange 5, is suitable for abutting against respectively on the cross bar in the described cross bar 11 that links to each other with shell 6.

Fig. 2 obviously illustrates, and when claw hook 14 just contacted cross bar 11, this just can limit the clamping of the thick rope 3 between another root cross bar 11 and fixed limit piece 13.

With reference to the accompanying drawings, the braking of thick rope 3 is to carry out on the relative section of the thick rope that directly links to each other with staff or load-carrying, and it is in the initial position of locking after fault glides.

People it may be noted that also that the qualification of clamping contacts with cross bar 11 by claw hook 14 and carry out, the effect (as shown by arrow F) of the impact that thick rope 3 opposite section one sides are directly glided.

Obviously, might with height that thick rope section flushes on configuration member that the clamping of thick rope 3 is braked and/or limited, thick rope 3 sections directly are subjected to the effect of above-mentioned power, or opposite.

Fig. 1 and Fig. 2 obviously illustrate, and cross bar 11 can be used as the S. A. of small sheave 9, also can be used as the point of connection of spring 12, can constitute the limiting stopper that thick rope 3 is braked, and maybe can the clamping of thick rope 3 be limited.

Apparatus of the present invention also comprise the releasable locking piece between pulley 4 and the flange 5, are used for flange 5 is rotated towards above-mentioned midway location.

Because there is not applied external force, flange 5 is parked on the time-out position after the elastic recovery of spring 12, and therefore, by pulley 4 drive flanges 5, it is necessary that thick rope 3 is implemented braking.

As can be seen, pulley 4 comprises lug 15 at it facing on the surface of flange 5 from Fig. 1 and Fig. 2, and described lug 15 is off-centre with respect to axle 7 and disposes symmetrically, is used to admit above-mentioned locking piece.

Shown in Fig. 4, locking piece is made of two counterweights that form sour jujube piece 16, and described two counterweights rotate freely and are installed on the eccentric lug 15, vertical projections from the surface of pulley 4.

Two sour jujube pieces 16 link to each other by two spring 17 elasticity.

Groove 18 forms on the facing surfaces of flange 5 in the form of a ring, when under the effect of the elastic recovering force of spring 17, getting back to the midway location of pulley 4 with convenient sour jujube piece 16, the action radius of ring-shaped article 19 restriction sour jujube piece 16 when the top of the external above-mentioned groove 18 of process.

Ring-shaped article 19 is put middle configuration on the axle 7 of pulley 4.

Groove 18 is configured in the outside of the groove 20 that forms on the facing surfaces of flange 5, and above-mentioned sour jujube piece 16 is in groove 20.

Movable sour jujube piece 16 is suitable for moving between above-mentioned midway location (shown in Fig. 4) and above-mentioned locked position, and at locked position, sour jujube piece 16 passes through the member 16a of its end just near groove 18.

Sour jujube piece 16 mediates under the effect of elastic restoring force, and when the centnifugal force that is produced by the rotation of pulley 4 surpassed numerical value according to spring 17 predetermined thresholds, sour jujube piece 16 left from middle position.

Obviously, purely from function aspects, strictly speaking, a sour jujube piece 16 and a groove 18 are necessary, for guaranteeing desirable locking safety, then are equipped with some grooves 18 and two sour jujube pieces 16.

For a long time, above-mentioned locking piece is known, and the present invention is not limited by this special locking piece.

Lock along two hand of rotation in order to ensure pulley, be equipped with two identical flanges 5, have identical groove 18 and identical groove 20.After described two flanges 5 configure, groove 18 in the opposite direction, end 16a and the 16b by sour jujube piece 16 respectively, the sour jujube piece that makes the both sides that are configured in flange 5 relative pulleys 4 is along each hand of rotation this pulley 4 of rotational lock just.

Also can alternately be equipped with a locking piece and a single flange that forms on respect to pulley surface, especially true under the situation of using single flange, this locking piece is made of the counterweight that forms the sour jujube piece, be preferably between the guide rail and move radially, described guide rail forms projection on the surface of pulley, when centnifugal force surpasses numerical value according to the spring stiffness predetermined threshold, described movable counterweight is suitable for just linking to each other with limiting stopper or groove, described groove is arranged in the above-mentioned single flange in the form of a ring, and described spring links to each other with the middle body of movable counterweight and pulley.

Like this, this locking piece is arranged on lip-deep single counterweight of pulley, can implement locking to it on two hand of rotation of pulley.

Both direction and the 16 enforcement lockings of single sour jujube piece along pulley also are possible, and described sour jujube piece 16 abuts against on pin or the groove by two end 16a and 16b, and described groove is arranged on the flange 5 in the form of a ring.

With reference to the accompanying drawings 4, sour jujube piece 16 can only just abut against on the groove 18 by its end 16a, and this is because each groove 18 has radial abutment surface 18a and guide surface 18b, slightly with ring-shaped article 19 separately.

Obviously, can be equipped with several pulleys that are fitted to each other and substitute single pulley 4, or be equipped with the alternative single pulley 4 of the pulley with some recessed necks, described recessed neck can make thick rope 3 install inner disk around some circles.

According to Fig. 5 to Fig. 9, in the implementation column of apparatus of the present invention, any captive joint that is used on certain altitude is distinguished each other by the shape of shell and the shape of flange usually, for example oval, circular or leaf the difference, also distinguished by the number of spring, also distinguished by its location, described spring 12 flexibly links to each other with shell 6 with flange 5.

Fig. 4 to Fig. 7 and Fig. 9 illustrate flange 5, and described flange 5 has the outline that is equipped with the prodger 21 that is regular intervals, and these prodgers 21 can have the function that is similar to aforementioned claw hook 14.

According to Fig. 5, Fig. 6 and Fig. 9, be equipped with two springs 12, one of be particularly useful for reducing in these springs the fracture of breaking down.

According to Fig. 5, spring 12 side direction are configured in the both sides of the pulley 4 on the device, and similar along the direction orientation that is parallel to thick rope 3 sections, the section of described thick rope 3 stretches out from installing 1.

According to Fig. 6, two springs 12 are fixed on the cross bar 11, described cross bar 11 also is used on certain altitude it being hooked, and above-mentioned spring 12 links to each other with the end of two different cross bars 10, and described cross bar 10 is balanced configuration with respect to axle 7 perpendiculars that run through by device.

According to Fig. 9, two springs 12 are balanced configuration with respect to axle 7 and along perpendicular.

According to the modification shown in Fig. 5 to Fig. 9, mainly to be distinguished by the position and the shape of limiting stopper, described limiting stopper is used for clamping and braking thick rope 3 under situation about gliding.

Device shown in Fig. 5 comprises two movable limiting stoppers 22, and its effect is identical with the effect of the limiting stopper 13 shown in Fig. 1 to Fig. 3.

Movable limiting stopper 22 is balanced configuration with respect to the perpendicular that is run through by axle 7, is hinged on the pulley 4 exterior flanges 5.

Movable limiting stopper 22 clamps thick rope 3 by the inside at pulley 4 recessed necks 8 it is braked, when flange when its control position moves, each movable limiting stopper 22 is by the rotation effect of eccentering arm 22a on thick rope 3, described eccentering arm 22a forms cam, and this cam type surface leans against on the fixed transverse rod 11 that forms cam bowl.

In the normal work period of device 1, for limiting stopper 22 is remained on midway location, two movable limiting stoppers 22 are linked on the free end of arm 22a by spring 23.

According to Fig. 6, also be equipped with two movable limiting stoppers 24, described movable limiting stopper 24 is hinged on the shell 6 symmetrically with respect to the perpendicular that is run through by axle 7.Movable limiting stopper 24 constitutes cams, and wherein, free end just is clamped in the fixed limit piece for example between cross bar 10 and the thick rope 3.Therefore, the braking of thick rope 3 is implemented by clamping thick rope 3, between cam 24 end faces and pulley 4 recessed necks 8 of described thick rope 3 after the slip of the rotation of flange 5 and fixed limit piece, described fixed limit piece constitutes the cam bowl 10 on cam 24 profiles.

The side of cam 24 from the opposite side of thick rope 3 to thick rope 3 exits disposed, be used for opposite thick rope 3 sections on thick rope 3 sections that directly link to each other with load-carrying or with the staff are braked, so just can improve braking by on the shell that almost is the semicircumference shape at the recessed neck of pulley it being rubbed to thick rope.

Obviously, can be used for direct supporting load-carrying or staff's thick rope 3 sections are braked from disposing cams 24 with thick rope 3 outlet homonymies.

In the modification described in Fig. 5 to Fig. 8, be used for the limiting stopper that thick rope 3 is braked is configured in thick rope 3 outsides, this layout is opposite with layout described in Fig. 1 to 3.

In the embodiment shown in fig. 7, the present invention also comprises two movable limiting stoppers 25 that are hinged on the flange, described two limiting stoppers 25 constitute cam respectively, being suitable for just thick rope 3 being clamped in the cam portion profile moves on the recessed neck of pulley afterwards, described cam type surface is positioned on the fixed limit piece that forms cam bowl, for example is configured in the cross bar 11 between the shell 6.

Cam 25 also comprises the convex shoulder that forms hook 25a at its free end face, be suitable for just contacting with the limiting stopper that is provided between the shell 6, being preferably in flange 5 links to each other with the cross bar 11 that forms cam bowl after control position moves, this just especially can be limited the clamping of thick rope 3, any fractureing or the danger of damaged aspect of avoiding described thick rope 3.

According to Fig. 8, the braking of thick rope 3 is guaranteed that by flexible limiting stopper 26 described flexible limiting stopper 26 is made of for example shackle, and the two ends of each flexible limiting stopper 26 link to each other with cross bar 11 on the shell with the cross bar on the flange 10 respectively.

Flexible limiting stopper 26 moves with the profile of thick rope 3 is local along its slideway on pulley 4.The end of described flexible limiting stopper 26 almost is configured in the both sides of pulley 4.

The braking of thick rope 3 is undertaken by the clamping between the recessed neck 8 of above-mentioned flexible limiting stopper 26 and pulley 4.In addition, this clamping is carried out on pulley periphery major part with respect to previously described modification.

According to Fig. 8, flexible limiting stopper 26 is balanced configuration with respect to the central plane that is run through by axle 7.

The helix rigid metal silk that forms scraper 35 is used to clear up rubbish or mud on the hawser in the exit that an end of device 1 one of is fixed in two sections opposite with flexible rope 3, and described rubbish or mud may block the mechanism on the device.

Metal filament 35 1 ends are coaxial with the section of the above-mentioned flexible rope that will clear up, and its other end is freely.

According to Fig. 9, the braking of thick rope 3 is implemented by two movable limiting stoppers 27,28, the end of described two movable limiting stoppers 27,28 is hinged on respectively on flange 5 and the shell 6, above-mentioned two movable limiting stoppers 27,28 are two longitudinal tie shapes that are connected with each other, and are connected with each other by parallel ring 29 in the pivotally attached mode.

The exit of left chain wheel 4, opposed each end is by above-mentioned pull bar 27,28 side direction and longitudinally guidings, and through encircling 29 medium pore 30 on the thick rope 3.When flange 5 when control position moves, pull bar 27,28 is almost along same direction orientation, still, ring 29 is skewed so that move along with the motion of pull bar 27, like this, thick rope 3 is implemented to brake on the height of two opposed end.

Encircle 29 shown in Figure 10 A and the 10B.Described ring 29 comprises medium pore 30, and thick rope 3 runs through described hole 30, and described ring 29 is joined the claw hook 31 of the outer projection of directed loop 29 with respect to hole 30 on diametric(al).These claw hooks 31 also are drilled with hole 31a, and its axis normal is 30 axis in the hole, is used to be hinged on two pull bars 27,28.

Obviously, apparatus of the present invention 1 can be suspended on the height of the center shaft 7 that for example installs on the certain altitude by the ring 2 that suspends.In the time of on the spider on device is fixed on underground passage way net for example, this mode that suspends especially has preceence for the rising of the S. A. of pulley 4.

Also an end of thick rope 3 can be linked to each other with capstan winch, be used to make load-carrying or staff to rise and decline.

Also can between two shells, increase another pulley in the modification, on coaxial, freely rotate, be suitable for admitting another root flexible rope, wherein, one end of described flexible rope links to each other with above-mentioned capstan winch, and the other end of hawser links to each other with the staff, rises so that make this staff be independent of thick rope 3 or descends, and described thick rope 3 is used to guarantee safety.

According to Figure 11, device 1 ＇ of the present invention is used to use the flexible connection point on the thick rope 3.

Opposite with previous embodiment, here, an end of thick rope 3 is suspended on the certain altitude, and the other end of thick rope 3 comprises a counterweight (not shown) here, and described counterweight is used to guarantee tension force predetermined on the thick rope 3.

Like this, in the exit of device 1 ＇, thick rope 3 opposed two ends are aimed at, and install the slight curving guide rail of 1 ＇ in-to-in along this and arrange.

Here, when device 1 ＇ descended or rises, the ring 2 that suspends was used for directly tangling staff's safety strap, therewith transmits.

This safety strap also can for example directly hang on the height of common axle 7 by the arch handle.

In the embodiment shown in Figure 11, the braking of thick rope 3 sections is implemented between clip 32 that takes the shape of the letter U and movable limiting stopper 33, the spermatic cord 3 in described exit at pulley 4 moves in described clip 32, described limiting stopper 33 1 sides are hinged on the shell 6, and opposite side is hinged on the arm 34, and described arm 34 itself is hinged on the claw hook 14 of flange 5.

Clip 32 and movable limiting stopper 33 are configured in the both sides of the thick rope 3 in pulley 4 exits, are used for just clamping thick rope 3 under the situation that the staff glides.

Two movable limiting stoppers 33 are with respect to balanced configuration on by axle 7 central planes that run through of pulley 4.

According to Figure 11, installing 1 ＇ is horizontal arrangement, still, obviously, can vertically install in use.

When using the flexible connection point, 1 ＇ is safe and reliable for apparatus of the present invention, even because the staff links to each other with device, slightly the braking of rope 3 always can be carried out.

In addition, the staff need not the weight of continuous holder 1 ＇, and for example when the staff was in changeless position, the weight of device produced autobrake to device on thick rope 3.

Also can use apparatus of the present invention 1 and 1 ＇ jointly, so that when operation, increase the safety of staff or load-carrying.

For this reason, when using apparatus of the present invention, can be equipped with the present invention's second device 1 ＇, be installed in and directly link to each other on the opposite thick rope section of section, second device, 1 ＇ is linked to each other with staff or load-carrying with staff or load-carrying in the mode of sliding.

Therefore, if directly the thick rope section that links to each other with staff or load-carrying fractures, so, second device, 1 ＇ is to carrying out glancing impact with the opposed thick rope section of above-mentioned thick rope section, stop the downslide of staff or load-carrying, because along the both direction braking of above-mentioned thick rope, so described thick rope section just is locked on the device 1 that is suspended in certain altitude.

In fact, under the situation of the thick rope section fracture that directly links to each other with staff or load-carrying, because the effect of counterweight, opposed thick rope section itself can be locked.

Reasonablely be, counterweight can be movable, is not having under the external force effect, and described counterweight can comprise brake component, is used for counterweight is remained on thick rope.

For example, when counterweight just abutted against on apparatus of the present invention or be clamped on the scaffold that carries out operation with the continuous staff of apparatus of the present invention, movable counterweight can make the staff descend continuously or rise.This brake component can be slightly less than the interior pipe of employed thick rope by for example diameter, or by the member that thick rope applies set pressure being constituted.

Counterweight can have ellipse or semi-spherical shape, and this counterweight comprises the elastic outer cover of for example foamed materials that is used to alleviate impact, is used to protect the user not to be subjected to the possible impact of counterweight.

Also can dispose the variable counterweight of weight, it has Internal baffle, the liquid or solid material filling of described counterweight, for example water or sand.

Obviously, apparatus of the present invention can be used plastic molding piece, are used to reduce the power that is applied on the thick rope.

For example the small sheave 9 in the modification described in Fig. 9 can adopt this plastic molding piece.

Also can be equipped with single assembly, this device comprises the indicating instrument that is made of aforementioned cross bar 10,11, and when the limiting stopper of thick Suo Jinhang braking and the guide that is positioned at the thick rope in device exit were moved, described device can use fixed or movable point of connection.

Referring to figs. 1 through Fig. 4, the operational circumstances of a lower device is described briefly.

Under the situation that for example staff glides, directed force F is applied to the section of thick rope, staff and described thick rope direct connection, and this just causes a large amount of unwindings of thick rope 3, and because the wipe contact between the recessed neck 8 of pulley 4 and the thick rope 3 is accelerated the rotation of pulley 4.

When the centnifugal force that sour jujube piece 16 is applied when the rotation by pulley 4 surpassed according to the numerical value of the rigidity predetermined threshold of spring 17, above-mentioned sour jujube piece just abutted against in the groove 18, and this just makes flange 5 and pulley 4 relative rotational locks.

Pulley 4 carries out transmission by the unwinding of thick rope 3 to flange 5, and described flange 5 pivots under the reset response of spring 12, and just clamps the section of the thick rope 3 between limiting stopper 13 and the cross bar 11.Like this, described thick rope 3 was braked in the extremely short time.

Because the recovery of elasticity effect of spring 12, in case the directed force F cancellation, the release of apparatus of the present invention then realizes automatically.

With reference to Figure 11, the operational circumstances of apparatus of the present invention 1 ＇ is described.

Under situation about gliding, install 1 ＇ rapidly to underdrive, the velocity of rotation that this has just accelerated thick rope 3 top sheaves 4 causes equally that flange 5 and pulley 4 are relative locks and to the braking of thick rope 3 sections.

Separate to be locked in when cancelling the application force that is applied on device 1 ＇ and also realize automatically.

Though the present invention is described with some embodiment, obviously, the present invention is not limited by embodiment, and under the situation that does not exceed the scope of the invention and thinking thereof, people can make multiple modification and improvement.

Claims (11)

1, a kind of safety device for preventing elevator from falling down, comprise at least one flange (5), be equipped with pulley (4) rotationally with recessed neck of ring-type (8) in the inboard of described flange (5), the recessed neck of described ring-type (8) is used to admit flexible rope (3), locking piece (16,18) on the surface of described pulley (4) and described flange (5), form respectively, when pulley (4) rotates and freely rotates and the centnifugal force that produces during above the numerical value of predetermined threshold at reverse situation lower sheave (4), described locking piece (16,18) be used for optionally making pulley (4) and the relative rotational lock of flange (5), it is characterized in that, described device (1,1 ') also comprise two shells that are connected with each other and are certain intervals (6), described flange (5) and pulley (4) rotate in the inboard of described shell by common axis of rotation (7), its feature also is, each flange (5) is suitable for moving between at least two bevelled control positioies, wherein, at least two limiting stoppers (13,22,10,25,26,27,34; 11,24,28,29,32,33) be disposed at respectively described flange and described shell around, be used for making described flexible rope braking and stand by the mode that for example clamps or lock, described hawser can slide along the recessed neck of described pulley in the midway location of a time-out.

According to the device described in the claim 1, it is characterized in that 2, each flange pulls to above-mentioned time-out position by the such elastic reset spare of spring (12) that for example links to each other with shell with described flange.

According to the device described in claim 1 or 2, it is characterized in that 3, it comprises by plurality of cross bars (10) and link to each other and be two flanges of certain intervals each other, be used within it side and settle above-mentioned pulley that this flange is a rotary moveable with respect to shell.

4, according to described device one of in the aforementioned claim, it is characterized in that two limiting stoppers (13,27,33,34; 11,28,29,32) be disposed at the flexible rope section both sides that to brake, when each flange is mobile towards one of above-mentioned control position, just hawser is locked and clamped.

5, according to described device one of in the claim 1 to 3, it is characterized in that, two limiting stoppers limiting stopper (22,24,25,26) on its supporting member separately is movable, another limiting stopper (10,11) is fixed, when each flange is mobile on control position, movable limiting stopper abuts on the fixed limit piece, and this just causes that movable limiting stopper moves, and the flexible rope section that will brake between recessed neck of pulley and the described movable limiting stopper is clamped.

6, according to described device one of in the aforementioned claim, it is characterized in that, it is included on the above-mentioned shell and the some members on each flange (14,11,25a), is used to limit flange moving on control position, and these spacing members can be configured on the aforementioned limiting stopper.

7, according to described device one of in the aforementioned claim, it is characterized in that, guide (9) is installed in device (1 ＇) near between the shell in two opposite sections of flexible rope exit, almost be configured in the both sides of pulley, using under the situation that flexibly connects point, be used for along almost linearly direction or vertical direction flexible rope is led, and described flexible rope is remained on the device.

8, according to described device one of in the claim 1 to 6, it is characterized in that, guide (9) is installed between the shell of device (1) in two opposite sections of flexible rope exit, be configured in the homonymy of pulley and close to each other, under the situation of using fixed connection point, flexible rope almost takes the shape of the letter U.

9, according to the device described in claim 7 or 8, it is characterized in that, it comprises indicating instrument, this indicating instrument can be regulated the position of above-mentioned limiting stopper and/or above-mentioned guide, so that can under the situation that flexibly connects point or fixed connection point, use same device (1,1 ＇), described limiting stopper and/or described guide are the forming die products that cuts shape that is that pre-determines size, and they go for same device by described indicating instrument.

10, according to described device one of in the aforementioned claim, it is characterized in that it comprises movable counterweight and brake component, described counterweight is at an end of flexible rope, and described brake component remains on counterweight on the flexible rope under the situation of applied external force not having.

11, according to described device one of in the aforementioned claim, it is characterized in that, comprise that at least one forms the member of scraper, be installed near the exit one of in opposite two sections of flexible rope (3), so that clear up described flexible rope, the member of this formation scraper is by for example constituting twist and with the coaxial rigid metal silk (35) of the above-mentioned flexible rope that will clear up.

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