CN201010475Y

CN201010475Y - No-load braking engaging gear of chain block

Info

Publication number: CN201010475Y
Application number: CNU2007201114236U
Authority: CN
Inventors: 王鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-07-04
Filing date: 2007-07-04
Publication date: 2008-01-23
Anticipated expiration: 2017-07-04

Abstract

The utility model discloses a zero load brake disconnecting device of hand lever chain hoist; a multi-head screw thread is rotately sleeved with a reversing ratchet of a long shaft; a regulating piece, a hand wheel, a positioning piece and a nut are arranged on the long shaft in turn; the regulating piece is fixedly with the long shaft in periphery; a twisting elastic piece is provided between the regulating piece and the reversing ratchet; one end of the twisting elastic piece is connected with the reversing ratchet, and the other end of the twisting elastic piece is connected with the regulating piece; the hand wheel is hollowly sleeved on the long shaft and is fixed on the reversing ratchet in periphery; the positioning piece is fixed on the long shaft in periphery; a through hole is provided on the positioning piece; a positioning pin and a pressing spring are inserted into the through hole; one end of the pressing spring is against the positioning pin; the other end of the pressing spring is against the positioning piece; a positioning groove structure corresponding to the positioning pin is provided on the hand wheel. The hand lever chain hoist in the utility model can drop a chain rapidly; a handle can be operated to lift or drop the chain.

Description

The unloaded brake clutch device of a kind of Lever Blocks

Technical field

The utility model belongs to the weight-lifting equipment field, particularly relates to a kind of unloaded brake clutch device that is used on the Lever Blocks.

Background technology

The essential structure of Lever Blocks is generally: on a framework chain hoist wheel that an energy freely rotates is housed, hang with a hoisting chain that is meshed with it on this sprocket wheel, the major axis that energy of chain hoist wheel central mounting freely rotates, major axis one end is engaged with intermediate gear, major axis is in transmission connection with chain hoist wheel after slowing down by intermediate gear, the major axis other end circumferentially is fixed with the drg seat by spline, be set with ratchet and friction lining on the drg seat, a commutation ratchet is screwed on the major axis by multi-head spiral, presses to ratchet and friction lining; Ratchet is housed on the framework, ratchet is meshed with ratchet under the effect of ratchet spring all the time, ratchet only allows ratchet towards the direction of improvement unidirectional rotation, has been made of the load brake type stop mechanism of Lever Blocks major axis, intermediate gear, drg seat, ratchet, ratchet, friction lining, commutation ratchet; Framework is provided with can be around the handle of major axis rotation, be provided with rotary commutation ratchet in the handle, the commutation ratchet is shaped with its rotating shaft and is connected, rotating shaft is provided with the selection spanner, select to stir about the spanner energy, the commutation ratchet is by the commutation spring push-tight in the handle, and by selecting spanner conversion both forward and reverse directions with the commutation ratchet engaged or separate; When pulling when lever operated, by of the forward and reverse engagement of commutation ratchet, make the forward and reverse rotation of chain hoist wheel by intermediate gear by major axis with the commutation ratchet, hoisting chain is risen or move down, thereby promote or put down weight.

The Lever Blocks of above-mentioned structure exists a problem in actual use: because forward and reverse engagement of the pawl point of commutation ratchet and commutation ratchet commutating tooth is to finish under the resilient force of commutation spring, and Lever Blocks is to rely on the load braking, therefore, in the time of when zero load, need pulling the handle rising or move down hoisting chain, the friction drag of ratchet is greater than its coupling mechanism force from stop mechanism that is subjected to because the commutation ratchet is subjected to commutating, make handle in the backhaul of pulling, the commutation ratchet can't break away from the commutation ratchet, the handle band commutation ratchet reciprocally swinging together, can't elevating chain.

About this problem, in being the domestic patent documentation of ZL200420082387.1, the patent No. proposes: by between commutation ratchet and handwheel, a floating spring being set, make it apply a tangential torsion to the commutation ratchet, feasible commutation ratchet is pressing friction sheet and ratchet all the time, thereby reaches self-locking and braking.Though solved the problem that can't promote when Lever Blocks is unloaded like this, but, also brought another bigger problem, because stop mechanism is brake action all the time, so Lever Blocks just can't be when zero load quick decline chain, and a critical function of other manual weight-lifting equipments such as the chain that descends fast to be Lever Blocks be different from chain block if still need the turning handle suspension hook that descends when unloaded, so just greatly reduces work efficiency.

Summary of the invention

In order to solve above-mentioned technical matters, the purpose of this utility model provides the unloaded brake clutch device of a kind of Lever Blocks, when the Lever Blocks zero load needs to promote chain, can provide an axial pressing force to stop mechanism, make stop mechanism brake, chain can promote, in that Lever Blocks is unloaded when needing quick decline chain, can remove this axial pressing force, make stop mechanism discharge, but the chain at high speed descend.

To achieve the above object, the utility model has adopted following technical scheme:

The unloaded brake clutch device of a kind of Lever Blocks, comprise by the commutation ratchet of multiple screw thread rotation set on major axis, adjustment part is installed on the described major axis successively, handwheel, locations and nut, described adjustment part and major axis are circumferentially fixing, be provided with elasticity of torsion part between adjustment part and the commutation ratchet, one end of described elasticity of torsion part connects the commutation ratchet, the other end connects adjustment part, described handwheel sky is enclosed within on the major axis and with the commutation ratchet and circumferentially fixes, described locations and major axis are circumferentially fixing, locations is provided with through hole, be inserted with locating dowel pin and stage clip in the through hole, stage clip one end and locating dowel pin offset, and the stage clip other end and locations offset, and described handwheel is provided with corresponding positioning groove structure with locating dowel pin.

As preferably, above-mentioned locating dowel pin comprises pin head, flange and pilot bar, described pin head is corresponding with the positioning groove structure on the handwheel, described flange be located at locations on limited step in the through hole offset and contact, described stage clip one end is enclosed within on the pilot bar and with flange and offsets, the stage clip other end offsets and is connected with governing screw, and governing screw is connected with through hole whorl.

This kind locating pin structure is provided with and locating dowel pin can be limited in the suitable flexible scope, it is long both to have avoided locating dowel pin to stretch out, and conflicting to rub with handwheel elasticity all the time produces resistance and wearing and tearing, has also avoided locating dowel pin to be pushed up back excessively, the indentation through hole is interior even can't eject locate failure; And governing screw can be regulated the elastic force of stage clip easily, and is reliable, easy to use to guarantee the location.

As preferably, above-mentioned positioning groove structure is meant and is provided with a low boss and a high boss on handwheel, is formed with the positioning groove that holds locating dowel pin between low boss and the high boss.

Adopt the middle structure that forms detent of two boss, can avoid the wipe contact of locating dowel pin and handwheel; Adopt the mode of a low boss and a high boss to make locating dowel pin can the elasticity withdrawal stride across low boss and be absorbed in positioning groove, stride across high boss, avoided because of rotating the excessive locate failure of strength and can not continue withdrawal.

As preferably, the center is symmetrically arranged with two locating dowel pins on the above-mentioned locations, and above-mentioned handwheel is provided with two corresponding positioning groove structures.

As preferably, above-mentioned adjustment part radially is extended with the position-limited claws of at least 2 restriction elasticity of torsion parts displacement.Above-mentioned adjustment part is provided with 4 position-limited claws.Stuck and the inefficacy that position-limited claw can avoid elasticity of torsion part sway to cause is set.

Above-mentioned elasticity of torsion part is the cylinder torsion spring.

Above-mentioned torsion spring two ends radially are bent to form hook, and an end buckles and is connected with being located at the fixed leg of commutation on the ratchet, and the other end buckles with a position-limited claw and is connected.

As preferably, above-mentioned torsion spring two ends are bent to form latch vertically, and an end plugs with the jack that is located on the commutation ratchet, and the other end plugs with the jack that is located on the position-limited claw.Such structure is convenient installs and processing.

Above-mentioned adjustment part and locations are circumferentially fixing by spline and major axis; The positioning boss of described commutation ratchet and handwheel green phase coupling and detent are circumferentially fixing.

The utility model is owing to adopted above technical scheme, commutation ratchet, handwheel and adjustment part, locations that the difference that is provided with between green phase is rotated synchronously, between commutation ratchet and adjustment part, elasticity of torsion part is set, optionally circumferentially fixing by locating pin structure between handwheel and locations; When handwheel and locations are fastened when rotating synchronously, the tangential twisting resistance that elasticity of torsion part applies the commutation ratchet is closed between commutation ratchet and the adjustment part, can not be converted into the axial pressing force of commutation ratchet to stop mechanism, the commutation ratchet separates with friction lining, stop mechanism discharges, thereby but at high speed decline chain; When handwheel separated with locations, the commutation ratchet rotated forward under the tangential twisting resistance effect that elasticity of torsion part applies it, pressing friction sheet and ratchet, and stop mechanism locking braking promotes or the decline chain thereby can pull handle.

Description of drawings

Fig. 1 is the mechanism element explosive decomposition figure of the utility model embodiment 1.

Fig. 2 is the mechanism element explosive decomposition figure of the utility model embodiment 2.

Fig. 3 is the partial schematic diagram of handwheel when matching with locations.

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present utility model is made a detailed explanation.

Embodiment 1:

The unloaded brake clutch device of a kind of Lever Blocks as shown in Figure 1, comprise by the commutation ratchet 6 of multiple screw thread rotation set on major axis 1, also be set with adjustment part 8 on the described major axis 1 successively, handwheel 9, locations 10 and nut 14, described adjustment part 8 is circumferentially fixing with major axis 1, be provided with elasticity of torsion part 7 between adjustment part 8 and the commutation ratchet 6, one end of described elasticity of torsion part 7 connects commutation ratchet 6, the other end connects adjustment part 8, described handwheel 9 skies are enclosed within on the major axis 1 and with commutation ratchet 6 and circumferentially fix, described locations 10 is circumferentially fixing with major axis 1, locations 10 is provided with through hole 100, be inserted with locating dowel pin 11 and stage clip 12 in the through hole 100, stage clip 12 1 ends and locating dowel pin 11 offset, and stage clip 12 other ends and locations 10 offset, and described handwheel 9 is provided with and locating dowel pin 11 corresponding positioning groove structures.

In the present embodiment, drg seat 2 is sleeved on the spline 101 of major axis 1, has extended axially boss 201 on the drg seat 2, and friction lining 3, ratchet 4, friction lining 5 sky successively are enclosed within on the boss 201; Commutation ratchet 6 rotation sets are on the multiple screw thread 102 of major axis 1, commutation ratchet 6 left sides are extended with annular boss vertically, annular boss offsets with friction lining 5 and contacts, commutation ratchet 6 right sides are extended with annular boss 602 vertically, annular boss 602 is provided with two detents 601, is with cylinder torsion spring 7 in the annular boss 602; Torsion spring 7 two ends radially are bent to form hook, and an end 701 buckles and is connected with being located at the fixed leg of commutation on the ratchet 6, and the other end 702 buckles with a position-limited claw 801 on the adjustment part 8 and is connected; Adjustment part 8 is sleeved on the spline 103 of major axis 1, and adjustment part 8 radially is extended with the position-limited claw 801 of 4 restriction torsion springs, 7 displacements, adjustment part 8 overhead cover handwheels 9; Handwheel 9 left sides are extended with annular boss 901 vertically, annular boss 901 is provided with detent 601 engagements on positioning boss 902 and commutation ratchet 6 right sides, thereby handwheel 9 right side circumference extend axially in central authorities and form circular groove, are provided with the positioning groove structure of two group switching centre symmetries in the circular groove; As shown in Figure 3, each positioning groove structure comprises a low boss 903 and high boss 904 that is disposed radially, and is formed with the positioning groove that holds locating dowel pin 11 between low boss 903 and the high boss 904; The splined hole of locations 10 part is outstanding to the left to be sleeved on the spline 103 of major axis 1, and with adjustment part 8 closed contacts, the bracelet part of locations 10 is roughly suitable with the excircle of handwheel 9, but with handwheel 9 a little space at interval; The bracelet part of locations 10 is provided with two centrosymmetric step through-holes 100, is provided with locating dowel pin 11, stage clip 12, governing screw 13 in the through hole 100 from left to right successively; As Fig. 1, shown in Figure 3, locating dowel pin 11 comprises pin head 111, flange 112 and pilot bar 113, described pin head 111 is corresponding with the positioning groove structure on the handwheel 9, flange 112 be located at locations 10 on limited step in the through hole 100 offset and contact, make pin 111 and one little gap, handwheel 9 intervals after installing; Stage clip 12 1 ends are enclosed within on the pilot bar 113 and with flange 112 and offset, and stage clip 12 other ends offset and are connected with governing screw 13, and governing screw 13 is threaded with through hole 100.

The following describes the basic operation process: when needing before the load operation to descend hoisting chain fast, the pawl point of ratchet of at first will commutating is thrown off with the commutating tooth of commutation ratchet 6 and is discharged, the bracelet partial fixing of holding with a firm grip on the locations 10 is motionless, anticlockwise motion handwheel 9, make locating dowel pin 11 on the locations 10 fall into positioning groove on the handwheel 9, make handwheel 9 and locations 10 circumferentially fixing, at this moment, locations 10, handwheel 9, adjustment part 8 and commutation ratchet 6 are all circumferentially fixing with respect to major axis 1, in fact, the tangential twisting resistance that 7 pairs of commutation ratchets 6 of torsion spring apply is closed between commutation ratchet 6 and the adjustment part 8, can not be converted into the axial pressing force of 6 pairs of friction linings 5 of commutation ratchet, commutation ratchet 6 and friction lining 5, ratchet 4, friction lining 3 breaks away from closed contact, produce the gap each other, thereby stop mechanism is discharged fully, and hoisting chain just can freely be draged, thereby descends chain fast; After hoisting chain decline finishes, clockwise direction rotates handwheel 9, make locating dowel pin 11 on the locations 10 deviate from positioning groove on the handwheel 9, like this, commutation ratchet 6 just no longer is circumferentially fixing with respect to major axis 1, and adjustment part 8 is circumferentially fixing with respect to major axis 1, thereby it is stubborn to friction lining 5 and be adjacent to make commutation ratchet 6 rotate under the twisting resistance effect of torsion spring 7, the final commutation ratchet 6 that makes, friction lining 5, ratchet 4, friction lining 3 all is connected as a single entity and is circumferentially fixing with major axis 1, at this moment whether the braking of realization drg have load to promote chain and the decline chain all can be finished by pulling handle (commutation ratchet); Around here, more detailed Lever Blocks braking principle and working process can be 200720105369.4 with reference to my application number, the patent application of " the unloaded braking of a kind of Lever Blocks engaging and disengaging gear " by name.

Embodiment 2:

As Fig. 1, the unloaded brake clutch device of a kind of Lever Blocks shown in Figure 3, torsion spring 7 two ends are bent to form latch vertically, and an end 701 plugs with the jack 604 that is located on the commutation ratchet 6, and the other end 702 plugs with the jack 802 that is located on the position-limited claw 801.Other structures are identical with embodiment 1 with operating process.

Claims

1. the unloaded brake clutch device of a Lever Blocks, comprise by the commutation ratchet (6) of multiple screw thread rotation set on major axis (1), it is characterized in that, adjustment part (8) is installed on the described major axis (1) successively, handwheel (9), locations (10) and nut (14), described adjustment part (8) is circumferentially fixing with major axis (1), be provided with elasticity of torsion part (7) between adjustment part (8) and the commutation ratchet (6), one end of described elasticity of torsion part (7) connects commutation ratchet (6), the other end connects adjustment part (8), described handwheel (9) sky is enclosed within major axis (1) and upward and with commutation ratchet (6) circumferentially fixes, described locations (10) is circumferentially fixing with major axis (1), locations (10) is provided with through hole (100), be inserted with locating dowel pin (11) and stage clip (12) in the through hole (100), stage clip (12) one ends and locating dowel pin (11) offset, stage clip (12) other end and locations (10) offset, and described handwheel (9) is provided with and the corresponding positioning groove structure of locating dowel pin (11).

2. the unloaded brake clutch device of a kind of Lever Blocks according to claim 1, it is characterized in that, described locating dowel pin (11) comprises pin head (111), flange (112) and pilot bar (113), described pin head (111) is corresponding with the positioning groove structure on the handwheel (9), described flange (112) limited step interior with being located at the last through hole (100) of locations (10) offsets and contacts, described stage clip (12) one ends are enclosed within pilot bar (113) and upward and with flange (112) offset, stage clip (12) other end offsets and is connected with governing screw (13), and governing screw (13) is threaded with through hole (100).

3. the unloaded brake clutch device of a kind of Lever Blocks according to claim 2, it is characterized in that, described positioning groove structure is meant and is provided with a low boss (903) and a high boss (904) on handwheel (9), is formed with the positioning groove that holds locating dowel pin (11) between low boss (903) and the high boss (904).

4. the unloaded brake clutch device of a kind of Lever Blocks according to claim 3 is characterized in that described locations (10) is gone up the center and is symmetrically arranged with two locating dowel pins (11), and described handwheel (9) is provided with two corresponding positioning groove structures.

5. the unloaded brake clutch device of a kind of Lever Blocks according to claim 1 is characterized in that described adjustment part (8) radially is extended with the position-limited claw (801) of at least 2 restriction elasticity of torsion parts (7) displacement.

6. the unloaded brake clutch device of a kind of Lever Blocks according to claim 2 is characterized in that described adjustment part (8) is provided with 4 position-limited claws (801).

7. the unloaded brake clutch device of a kind of Lever Blocks according to claim 5 is characterized in that described elasticity of torsion part (7) is the cylinder torsion spring.

8. the unloaded brake clutch device of a kind of Lever Blocks according to claim 7, it is characterized in that, described torsion spring (7) two ends radially are bent to form hook, one end (701) buckles with fixed leg on being located at commutation ratchet (6) and is connected, and the other end (702) buckles with a position-limited claw (801) and is connected.

9. the unloaded brake clutch device of a kind of Lever Blocks according to claim 7, it is characterized in that, described torsion spring (7) two ends are bent to form latch vertically, one end (701) plugs with the jack (604) that is located on the commutation ratchet (6), and the other end (702) plugs with the jack (802) that is located on the position-limited claw (801).

10. according to the unloaded brake clutch device of each described a kind of Lever Blocks in the claim 1 to 9, it is characterized in that described adjustment part (8) and locations (10) are circumferentially fixing by spline and major axis (1); The positioning boss (902) of described commutation ratchet (6) and handwheel (9) green phase coupling and detent (601) are circumferentially fixing.