CN102733752B - Movable safety ladder - Google Patents

Abstract

A movable safety ladder, including a bracket, the bracket is a foldable ladder, the front and rear sides of the bottom of the bracket are respectively equipped with a driving shaft and a driven shaft, and the two ends of the driving shaft and the driven shaft are respectively installed with walking Wheel, characterized in that: the movable safety ladder includes a belt transmission device and a handwheel operating mechanism, the belt transmission device includes a large pulley installed on the upper end of the bracket and a small pulley installed on the bottom of the bracket, the small belt The wheel is installed on one end of the driving shaft, and the large pulley and the small pulley are connected by a transmission belt; One end of the wheel shaft, and the other end of the hand wheel shaft is equipped with a hand wheel. The invention provides a movable safety ladder which can flexibly change the use force and movement speed, has good stability and has no noise.

Description

Movable Safety Ladder

technical field

The invention relates to a safety ladder, in particular to a herringbone ladder which can control the movement of the ladder on the ladder.

Background technique

In daily life, the ladder is an indispensable tool, and it is needed in occasions that require high-altitude operations such as hanging objects, painting walls, cleaning windows, and replacing lamps. And the miter ladder that occurs now does not possess the function that can allow the user to stand on the ladder and change the position of the ladder conveniently. We invented the movable safety ladder, which is a movable safety ladder for users to move the ladder conveniently and carry out high-altitude operations efficiently and safely. After a long period of research, we have proposed a herringbone ladder with wheels in two patents, patent No. Implement the method of moving and gears, chains to move the ladder. However, after long-term experimental research, it was found that the "movable ladder" needs an external driving force to realize the movement of the ladder; in addition, it was found that the method of applying gears and chains in the "movable ladder" cannot adjust the user's Depending on the force and the running speed of the ladder, there will be jamming and noise during the movement.

Contents of the invention

In order to overcome the deficiencies of the existing movable ladders that cannot flexibly change the use force and movement speed, poor stability, and noise, the present invention provides a flexible ladder that can flexibly change the use force and movement speed, has good stability, and has no noise. Movable safety ladder.

The technical solution adopted by the present invention to solve its technical problems is:

A movable safety ladder, comprising a bracket, the bracket is a foldable ladder, the front and rear sides of the bottom of the bracket are respectively equipped with a driving shaft and a driven shaft, and the two ends of the driving shaft and the driven shaft are respectively installed with walking Wheel, characterized in that: the movable safety ladder includes a belt transmission device and a handwheel operating mechanism, the belt transmission device includes a large pulley installed on the upper end of the bracket and a small pulley installed on the bottom of the bracket, the small belt The wheel is installed on one end of the driving shaft, and the large pulley and the small pulley are connected by a transmission belt; One end of the wheel shaft, and the other end of the hand wheel shaft is equipped with a hand wheel.

Further, the other end of the driving shaft is equipped with a braking device, the braking device includes a brake disc, a brake casing, a steel wire and a steel wire sleeve, a brake control block and a stopper, and the brake control block is an optical shaft bearing seat, which is placed in the hand On the wheel shaft, the block is fixed on the perforated aluminum plate by bolts, the steel wire and the steel wire sleeve are clamped and fixed in the gap of the optical axis bearing seat; the brake housing is fixed on the self-aligning ball bearing seat by bolts , the brake shoe is concentric with the brake disc, and the brake lever is fixedly connected with the steel wire.

A preferred solution: the movable safety ladder also includes a holding device, the holding device includes a top holding block and four bottom holding blocks, the top holding block is installed on the upper end beam of the bracket, and the four bottom holding blocks Mounted on the four feet of the stand.

Still further, the movable safety ladder also includes a perforated aluminum plate, two optical axis bearing seats, four self-aligning ball bearing seats and four self-aligning ball bearings; the top block is clamped and installed on the top of the bracket arc, the perforated aluminum plate is fixed on the top block through bolts and nuts, the two optical axis bearing seats are fixed on the aluminum plate through screws and nuts, and the hand wheel shaft is fixed on the aluminum plate through the optical axis bearing; The self-aligning ball bearing seat is fixed on the bottom block by bolts, and the self-aligning ball bearing is fixed on the self-aligning ball bearing seat to support the driving shaft and the driven shaft.

Furthermore, the traveling wheel includes a rubber wheel and an expansion sleeve, the rubber wheel is fixed on the driving shaft and the driven shaft through the expansion sleeve, and the small pulley is fixed on the driving shaft through interference fit .

The large pulley and the small pulley are pulley sets respectively.

As another preferred solution: there are two sets of belt transmission devices, belt transmission devices are respectively installed on the left and right sides of the bracket, the drive shaft is separated into two connecting shafts, and the left and right small pulleys pass through The interference fit is fixed on the two connecting shafts, and the left and right large pulleys are fixed on the hand wheel shaft through the interference fit.

The beneficial effects of the present invention are mainly manifested in: 1. Realize the function of moving the ladder on the ladder, which is convenient for application and greatly improves work efficiency; 2. The brake device maintains the stability of the ladder when it is still, and the application is safer; 3. It is clean and easy to use. No noise, small and compact structure, easy to fold and store;

Description of drawings

Fig. 1 is the overall structural diagram of the movable safety ladder.

Fig. 2 is a top structural diagram of the movable safety ladder.

Fig. 3 is a structural diagram of the driving shaft of the front wheel of the movable safety ladder.

Fig. 4 is a structural diagram of the rear wheel driven shaft of the movable safety ladder.

Figure 5 is a structural diagram of the pulley set.

Figure 6 is a structural diagram of the expansion sleeve.

Figure 7 is a detailed view of the brake part.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Fig. 1-Fig. 7, a movable safety ladder includes a bracket, a belt transmission device, a brake device, a fastening device, and other devices. The bracket is a foldable four-stage ladder, and the belt transmission device Installed on the left side of the support, the belt transmission device includes a large pulley 10, a small pulley 14 and a common v-belt 11, and the braking device is installed on the driving shaft 17 of the support foot. The device includes a brake disc 18, a brake shell 19, a steel wire 6 and a steel wire sleeve, a brake control block 7 and a block 5, and the clamping device is installed on the upper beam and four feet of the bracket, and the clamping device includes a Top block 3 and four bottom blocks 12, said other devices include a hand wheel 2, a hand wheel shaft 9, a driving shaft 17, a driven shaft 21, four rubber wheels 16, four expansion Tight sleeve 20, a perforated aluminum plate 4, two optical axis bearing housings 8, four self-aligning ball bearing housings 13, four self-aligning ball bearings 15 and some bolts and nuts;

The top holding block 3 is clamped and installed on the top arc of the bracket, the perforated aluminum plate 4 is fixed on the top holding block 3 by bolts and nuts, and the relationship between the perforated aluminum plate 4 and the top holding block can be changed by adjusting the bolts and nuts. The relative position of the block 3 adjusts the center distance of the belt drive, the two optical shaft bearing blocks 8 are fixed on the perforated aluminum plate 4 by screws and nuts, and the handwheel shaft 9 is fixed on the On the perforated aluminum plate 4, the hand wheel 2 is fixed on the hand wheel shaft 9 through radial bolts, the large pulley 10 is fixed on the hand wheel shaft 9 through interference fit, and the brake control block 7 is an optical shaft bearing seat , set on the handwheel shaft 9, the block 5 is fixed on the perforated aluminum plate 4 by bolts, the steel wire 6 and the steel wire sleeve are clamped and fixed in the gap of the brake control block 7; the bottom holding block 12 is clamped Tightly installed on the four legs at the bottom of the bracket 1, the self-aligning ball bearing seat 13 is fixed on the bottom block 12 by bolts, and the self-aligning ball bearing 15 is fixed on the self-aligning ball bearing seat 13 to support the active Shaft 17, driven shaft 21, the rubber wheel 16 is fixed on the driving shaft 17 and the driven shaft 21 through the expansion sleeve 20, the small pulley 14 is fixed on the driving shaft 17 through interference fit, The ordinary V-belt 11 is fixed by tensioning pulleys, the brake disc 18 is fixed on the driving shaft 17 through interference fit, and the brake shell 19 is fixed on the self-aligning ball bearing seat 13 by bolts. The brake shoe 23 is concentric with the brake disc 18, and the brake lever 24 is fixedly connected with the steel wire 6.

The large pulley 10 and the small pulley 14 are respectively replaced by a pulley set 22, and the pulley set 22 is fixed on the handwheel shaft 9 and the drive shaft 17 through interference fit, and the ordinary v-belt 11 is tensioned respectively It is fixed on pulleys with different diameters and transmission ratios, and can adjust the moving speed of the movable safety ladder and the applied force on the handwheel.

The normal V-belt 11 drive can be replaced by a synchronous belt drive, which does not need to be tensioned and has a certain self-locking ability.

The top holding block 3 and the perforated aluminum plate 4 cooperate to adjust the center distance to realize the tensioning of the belt, which is replaced by adding a tensioning wheel, which can make the tensioning of the belt simpler and more convenient.

The bracket 1 is replaced by an integrated bracket, the top of the integrated bracket is set to replace the platform of the top block 3, and the bottom four-legged solid hole is drilled to replace the bottom block 12, which can make the device more concise and compact.

Belt transmission devices are installed on the left and right sides of the support 1 respectively, and the driving shaft 17 is separated into two connecting shafts, and the left and right large pulleys are rotated forward or backward at the same time to move forward and backward. Different rotation speeds of the pulleys enable steering.

Claims (6)

1. a movable safety ladder, comprise support, described support is folding double ladder, before and after described frame bottom, side installs driving shaft and driven shaft respectively, the two ends installed rows travelling wheel respectively of described driving shaft and driven shaft, it is characterized in that: described movable safety ladder comprises belt driver and handwheel operating mechanism, described belt driver comprises the large belt wheel of rack-mount end and is arranged on the small pulley of frame bottom, described small pulley is arranged on one end of described driving shaft, and described large belt wheel is connected by driving-belt with small pulley; Described handwheel operating mechanism comprises hand wheel shaft, and described hand wheel shaft is positioned at pedestal upper end, and described large belt wheel is arranged on one end of hand wheel shaft, and the other end of described hand wheel shaft installs handwheel; The other end of described driving shaft installs brake gear, described brake gear comprises brake disc, brake shell, steel wire and steel wire cover, brake controll block and block, described brake controll block is optical axis bearing support, be enclosed within hand wheel shaft, described block is bolted on punching aluminium sheet, and described steel wire and steel wire cover are clamped in described optical axis bearing support gap fixing; Described brake shell is bolted on described self-aligning ball bearing seat, and described brake rubber block is concentric with described brake disc, and described brake linkage is connected with described fixation with steel wire.

2. movable safety ladder as claimed in claim 1, it is characterized in that: described movable safety ladder also comprises enclasp device, described enclasp device comprises a top holding block and four bottom holding blocks, top holding block is arranged on the upper end floor beam of support, and four bottom holding blocks are arranged on four footing of support.

3. movable safety ladder as claimed in claim 2, is characterized in that: described movable safety ladder also comprises one block of punching aluminium sheet, two optical axis bearing supports, four self-aligning ball bearing bearing supports and four self-aligning ball bearings; Described top holding block is clamped and installed in cradle top circular arc, and described punching aluminium sheet is fixed in the holding block of top by bolt and nut, and described two optical axis bearing supports are fixed on aluminium sheet by screw-nut, and described hand wheel shaft is fixed on aluminium sheet by optical axis bearing; Described self-aligning ball bearing seat is bolted on bottom holding block, and described self-aligning ball bearing is fixed on driving shaft, driven shaft described in described self-aligning ball bearing seat supports.

4. movable safety ladder as claimed in claim 3, it is characterized in that: described road wheel comprises rubber wheel and expansion sleeve, described rubber wheel is fixed on described driving shaft, driven shaft by described expansion sleeve, and described small pulley is fixed on driving shaft by interference fit.

5. movable safety ladder as claimed in claim 3, is characterized in that: described large belt wheel and described small pulley are respectively band wheels.

6. movable safety ladder as claimed in claim 1, it is characterized in that: described belt driver has two covers, two side mounting strap transmission devices respectively in the left and right of described support, described driving shaft separately becomes two connecting axles, left and right small pulley is fixed on two described connecting axles by interference fit, and described left and right large belt wheel is fixed on hand wheel shaft by interference fit.