CN116812717B

CN116812717B - Building construction elevator

Info

Publication number: CN116812717B
Application number: CN202311084176.5A
Authority: CN
Inventors: 陈健; 王前武; 顾雷
Original assignee: Nantong Dongzhijie Intelligent Equipment Co ltd
Current assignee: Nantong Dongzhijie Intelligent Equipment Co ltd
Priority date: 2023-08-28
Filing date: 2023-08-28
Publication date: 2023-11-17
Anticipated expiration: 2043-08-28
Also published as: CN116812717A

Abstract

The utility model relates to a building construction lifter which comprises a guide rail frame, a lifting cage arranged on the guide rail frame and a safety door arranged in a floor layer and matched with the lifting cage, wherein a control assembly, a cage door assembly and a pedal assembly are arranged in the lifting cage, a clamping assembly is further arranged on the outer side of the cage door assembly, the clamping assembly comprises a sliding sleeve and a clamping rod arranged in the sliding sleeve in a sliding manner, a clamping groove matched with the clamping rod is formed in the safety door, the control assembly is used for shielding a control operation button and driving the clamping rod to be clamped into the clamping groove in the horizontal sliding process, the clamping rod is matched with the clamping groove in the lifting process of the cage door assembly to drive a safety door to synchronously lift, a linkage assembly is further arranged between the cage door assembly and the pedal assembly, and the pedal assembly synchronously moves forward and backward in the lifting process of the cage door assembly through the linkage assembly.

Description

Building construction elevator

Technical Field

The utility model relates to the technical field of load hanging elevator equipment, in particular to a building construction elevator.

Background

With the rapid development of society, the building industry in modern China is more developed and prosperous. At present, most building construction sites need a gear-rack engaged lifter (commonly called a "cage") for transporting goods and taking up workers.

The patent of Chinese utility model with the bulletin number of CN109205416B discloses a lifter for building construction, which comprises four support columns and support ribs, wherein an outer guide rail is arranged on one side outer wall of each support column, a manned box is arranged on two side outer walls of each connecting block, a sliding block is arranged on one side outer wall of each manned box, and one side outer wall of each sliding block is arranged on one side outer wall of each outer guide rail; however, the inventor finds that although the above patent increases the number of people carried in a single lifting process, the following problems exist in practical use: the lifting cage door of the lifting cage and the safety door of the corresponding floor are required to be opened respectively when the building worker enters and exits the lifting cage each time, the building worker is inconvenient to descend for a long time, and the building worker easily forgets to close the safety door of the floor, so that certain potential safety hazard exists; .

One Chinese patent with publication number CN208829051U discloses a construction safety elevator, which comprises a portal frame, a counterweight seat, a shock absorber, a supporting plate, a protective shell, a motor shaft of the motor, a wire winding roller and a wire rope wound on the outer side of the wire winding roller through a coupler; the double-rope lifting device is reasonable in structural design, once one lifting rope is broken, the box body can be prevented from falling directly, the stability of the device is improved, and the loss of equipment and personnel in case of emergency such as falling of the box body is reduced; the inventor finds that a certain distance exists between the lifting cage and the floor, the risk of tripping and stepping on the ground exists when a building worker walks out of the lifting cage, and the potential safety hazard exists here, so that the utility model designs the building construction lifter aiming at the problems.

Disclosure of Invention

The utility model aims at overcoming the defects of the prior art, and provides a building construction lifter, which can synchronously drive the lifting of a floor safety door in the lifting process of a lifting cage door of a lifting cage, save the step of manual sequential operation, solve the defect that a building worker forgets to close the safety door, improve convenience and safety, synchronously drive the advance and retreat of a pedal assembly in the lifting process of the lifting cage door, provide pedal support for the building worker when the building worker walks out of the lifting cage, prevent the worker from tripping over and stepping on the ground by a gap, and further improve the safety stability of the lifter when in use.

The technical solution of the utility model is as follows:

the utility model provides a building construction lift, includes the guide rail frame, sets up the lift cage on the guide rail frame and sets up in the floor with lift cage matched with emergency exit, be provided with control assembly, cage door subassembly and pedal subassembly in the lift cage, the outside of cage door subassembly still is provided with the joint subassembly, the joint subassembly includes the sliding sleeve and slides the clamping rod that sets up in the sliding sleeve, be provided with on the emergency exit with clamping rod matched with draw-in groove, control assembly is used for sheltering from control operating button and drives clamping rod joint to the draw-in groove in horizontal slip's in-process, the cage door subassembly goes up and down the joint cooperation through clamping rod and draw-in groove and drives the emergency exit and go up and down in step by step, still be provided with the linkage subassembly between cage door subassembly and the pedal subassembly, pedal subassembly is through the synchronous advance and retreat of linkage subassembly in cage door subassembly lift in-process.

Preferably, the control assembly comprises a chute a arranged on an operation button in the lifting cage, a control stop block is arranged in the chute a in a sliding mode, and a pushing handle block is arranged on the outer end face of the control stop block.

As one preferable mode, the upper end portion of the control stop block is fixedly connected with an extension rod, the outer end portion of the extension rod is provided with a vertically upward bolt column, and a sliding groove b matched with the extension rod is formed in the side wall of the lifting cage.

Preferably, the cage door assembly comprises a cage door arranged in the lifting cage in a sliding manner, linear sliding blocks a are fixedly connected to two sides of the bottom end of the cage door, and linear guide rails a matched with the linear sliding blocks a are fixedly arranged in the side walls of the lifting cage.

As one preference, the cage door assembly further comprises a servo motor fixedly arranged at the upper top of the lifting cage, the output end of the servo motor is fixedly connected with a rotating shaft, a pair of winding discs matched with the cage door are fixedly arranged on the rotating shaft, guide wheels matched with the winding discs are fixedly arranged on two sides of the lifting cage, and a plurality of lifting rope traction blocks are arranged at the lower end parts of two sides of the cage door.

As one preferable mode, the clamping assembly comprises a sliding sleeve arranged on the outer wall of the hanging cage door and a clamping rod arranged in the sliding sleeve in a sliding manner, a bolt hole matched with the bolt post is formed in the lower end face of the clamping rod, and a reinforcing rib is fixedly arranged on the clamping rod.

Preferably, the safety door is slidably arranged in the floor in the vertical direction, and the clamping groove comprises two jacking blocks fixedly arranged on the outer wall of the safety door.

As one preferable, the pedal assembly comprises a pedal groove and a bearing sleeve plate arranged in the pedal groove, the lower end surface of the bearing sleeve plate is fixedly connected with a pair of linear sliding blocks b, a pair of linear guide rails b matched with the linear sliding blocks b are fixedly arranged on the bearing bottom surface of the lifting cage, and one side of the bearing sleeve plate is fixedly connected with a driving rack.

Preferably, the front side surface of the bearing sleeve plate is provided with a plurality of groups of sliding grooves c in the vertical direction, a plurality of foot pedals are connected in a sliding manner in the sliding grooves c, and the foot pedals are connected with the sliding grooves c through reset springs.

As still another preferred, the linkage assembly comprises a driving gear fixedly arranged on the side wall of the lifting cage and meshed with the driving rack, the rotating shaft end of the driving gear is connected with the rotating shaft through a belt, and a protective housing is further arranged on the outer side of the driving gear.

1. The lifting cage is internally provided with the control component and the clamping component, the control component horizontally slides to drive the clamping rod of the clamping component to be clamped into the clamping groove on the safety door, then the safety door is driven to synchronously lift through the clamping fit of the clamping rod and the clamping groove in the lifting process of the cage door component, the door opening convenience of the lifting cage and the floor is simplified through the operation, the complicated defect that the safety door needs to be opened in a divided manner in the prior art is overcome, the synchronous operation of the safety door along with the opening and closing process of the cage door is ensured, the defect that a worker possibly forgets to close the safety door is overcome, and the components are mutually matched to increase the overall safety and convenience of the lifter.

2. According to the lifting process of the lifting cage door, the linkage assembly synchronously drives the pedal assembly to move forward and backward, after the lifting cage door is lifted and opened, the bearing sleeve plate in the pedal assembly and the pedal plate slidably arranged in the bearing sleeve plate synchronously move outwards to fill the gap between the lifting cage and the floor, so that the safety is improved for workers to go in and go out of the lifting cage, accidental tripping or stepping is prevented, meanwhile, the pedal plate is provided with a plurality of groups in the vertical direction of the bearing sleeve plate, when the horizontal plane of the bearing sleeve plate and the floor are not on the same horizontal plane, the pedal plate under the bearing sleeve plate still ensures that the bearing sleeve plate can move outwards smoothly by virtue of the compression return spring, and the situation that the bearing sleeve plate is blocked against and cannot be effectively overlapped is prevented.

3. When the lifting cage is required to be lifted, the control stop block slides to the right to stop the opening and closing door button to expose the lifting button, so that a worker is convenient to control, and is prevented from mistakenly touching the opening and closing door button, when the lifting cage is stopped to be opened, the control stop block slides to the left to stop the lifting button to expose the opening and closing door button, and the clamping rod is driven to be clamped into the clamping groove of the safety door through the cooperation of the bolt post and the bolt hole in the leftward sliding process, and meanwhile, the worker is prevented from mistakenly touching the lifting button.

In conclusion, the building construction lifter has the advantages of ingenious design, simple structure, safe and stable use and the like, and is particularly suitable for the technical field of building construction equipment.

Drawings

The utility model is further described with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of a construction hoist;

FIG. 2 is a schematic view of the internal structure of the lifting cage;

FIG. 3 is an enlarged schematic view of the structure of FIG. 2 at A;

FIG. 4 is a schematic illustration of the structure of the extension rod and the latch post;

FIG. 5 is a schematic illustration of an internal side view structural connection of a lifting cage;

FIG. 6 is a schematic elevational view of the lifting cage;

FIG. 7 is a schematic view of a structure of a clamping assembly;

FIG. 8 is a schematic view showing a state in which the cage door and the safety door are lifted and lowered synchronously;

fig. 9 is a schematic view of a bearing sleeve plate not on the same horizontal plane with the floor.

Detailed Description

The technical solutions in the embodiments of the present utility model are clearly and completely described below with reference to the accompanying drawings.

Examples

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

As shown in fig. 1 to 9, the building construction lifter comprises a guide rail frame 1, a lifting cage 2 arranged on the guide rail frame 1 and a safety door 301 arranged in a floor 3 and matched with the lifting cage 2, wherein a control assembly 4, a cage door assembly 5 and a pedal assembly 6 are arranged in the lifting cage 2, a clamping assembly 7 is further arranged on the outer side of the cage door assembly 5, the clamping assembly 7 comprises a sliding sleeve 701 and a clamping rod 702 arranged in the sliding sleeve 701 in a sliding manner, a clamping groove 302 matched with the clamping rod 702 is formed in the safety door 301, the control assembly 4 is used for shielding a control operation button and driving the clamping rod 702 to be clamped into the clamping groove 302 in the horizontal sliding process, the clamping cooperation of the clamping rod 702 and the clamping groove 302 drives the safety door 301 to synchronously lift in the lifting process of the cage door assembly 5, a linkage assembly 8 is further arranged between the cage door assembly 5 and the pedal assembly 6, and the pedal assembly 6 synchronously moves in the lifting process of the cage door assembly 5 in a moving manner through the linkage assembly 8.

Referring to fig. 3, specifically, the control assembly 4 includes a chute a401 provided on an operation button in the lifting cage 2, a control block 402 is slidably provided in the chute a401, a pushing handle block 403 is provided on an outer end surface of the control block 402, and a construction worker operates horizontal sliding of the control block 402 on the chute a401 by pushing the handle block 403.

Referring to fig. 3 and fig. 4, specifically, an extension rod 404 is fixedly connected to the upper end of the control block 402, a vertically upward latch post 405 is disposed at the outer end of the extension rod 404, a chute b406 matched with the extension rod 404 is formed on the side wall of the lifting cage 2, and the extension rod 404 slides on the chute b406 in a limited manner.

Referring to fig. 2 and 5, specifically, the cage door assembly 5 includes a cage door 501 slidably disposed in the lifting cage 2, two sides of a bottom end portion of the cage door 501 are fixedly connected with linear sliders a502, a linear guide rail a503 matched with the linear sliders a502 is fixedly disposed in a side wall of the lifting cage 2, and the cage door realizes limit lifting in a vertical direction through the linear sliders a502 and the linear guide rail a 503.

Referring to fig. 5 and fig. 6, specifically, the cage door assembly 5 further includes a servo motor 504 fixedly disposed on the upper top of the lifting cage 2, an output end of the servo motor 504 is fixedly connected with a rotating shaft 505, a pair of winding discs 506 matched with the cage door 501 are fixedly disposed on the rotating shaft 505, guide wheels 507 matched with the winding discs 506 are fixedly disposed on two sides of the lifting cage 2, a plurality of lifting rope traction blocks 508 are disposed on two lower ends of the cage door 501, the lifting rope traction blocks 508 on two lower ends of the cage door 501 are used for installing traction lifting ropes, the servo motor 504 rotates positively and negatively to drive the winding discs 506 to achieve rope winding and unwinding, the guide wheels 507 limit and guide the lifting ropes, and the lifting operation is achieved by driving the cage door 501 through the disposed lifting ropes.

Referring to fig. 7, specifically, the clamping assembly 7 includes a sliding sleeve 701 disposed on an outer wall of the cage door 501 and a clamping rod 702 slidably disposed in the sliding sleeve 701, a bolt hole 703 matched with the bolt post 405 is formed on a lower end surface of the clamping rod 702, a reinforcing rib 704 is fixedly disposed on the clamping rod 702, the bolt hole 703 is matched with the bolt post 405 on the extension rod 404, and the clamping rod 702 is driven to be clamped into the clamping groove 302 in a sliding process of the control stop block 402 in a plugging manner.

Referring to fig. 8, specifically, the safety door 301 is slidably disposed in the floor 3 in the vertical direction, the clamping groove 302 includes two lifting blocks 303 fixedly disposed on the outer wall of the safety door 301, and the width of the clamping groove 302 is larger than that of the clamping bar 702, so that the clamping bar 702 is more beneficial to enter the clamping groove 302.

It should be noted that, the lifting cage 2 is internally provided with the control component 4 and the clamping component 7, the control component 4 horizontally slides to drive the clamping rod 702 of the clamping component 7 to be clamped into the clamping groove 302 on the safety door 301, then the cage door 501 of the cage door component 5 is driven to synchronously lift through the clamping cooperation of the clamping rod 702 and the clamping groove 302 in the lifting process, the convenience of opening the lifting cage 2 and the floor 3 is simplified through the operation, the complicated defect that the lifting cage 2 and the floor 3 need to be opened in a separated mode in the prior art is overcome, the synchronous operation of the safety door 301 along with the opening and closing process of the cage door 501 is ensured (the state is shown in the attached figure 8), the defect that a worker possibly forgets to close the safety door 301 is overcome, and the integral safety and convenience of the lifting machine are improved through the mutual cooperation of the components.

Meanwhile, the control block 402 in the control assembly 4 can block a certain button in the lifting cage 2 at any time, when the lifting cage 2 needs to be lifted, the control block 402 slides to the right to block the opening and closing door button to expose the lifting button, so that a worker can conveniently control the opening and closing door button, and when the lifting cage 2 stops to be opened, the control block 402 slides to the left to block the lifting button to expose the opening and closing door button, and in the process of sliding to the left, the clamping rod 702 is driven to be clamped into the clamping groove 302 of the safety door 301 through the cooperation of the bolt post 405 and the bolt hole 703, and meanwhile, the worker is prevented from mistakenly touching the lifting button.

Examples

As shown in fig. 5 and 9, wherein the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, only the differences from the first embodiment will be described below for the sake of brevity; the second embodiment is different from the first embodiment in that: the pedal assembly 6 comprises a pedal groove 601 and a bearing sleeve plate 602 arranged in the pedal groove 601, a pair of linear sliding blocks b603 are fixedly connected to the lower end face of the bearing sleeve plate 602, a pair of linear guide rails b604 matched with the linear sliding blocks b603 are fixedly arranged on the bearing bottom face of the lifting cage 2, a driving rack 605 is fixedly connected to one side of the bearing sleeve plate 602, and the bearing sleeve plate 602 realizes limit sliding through the arranged linear sliding blocks b603 and the linear guide rails b 604.

Referring to fig. 9, specifically, a plurality of groups of sliding grooves c606 are formed in the front side surface of the bearing sleeve plate 602 in the vertical direction, a plurality of foot pedals 607 are slidably connected in the sliding grooves c606, and the foot pedals 607 are connected with the sliding grooves c606 through return springs 608.

Referring to fig. 5 and 6, specifically, the linkage assembly 8 includes a driving gear 801 fixedly disposed on a side wall of the lifting cage 2 and meshed with the driving rack 605, a rotation shaft end of the driving gear 801 is connected with the rotation shaft 505 through a belt 802, a protective cover 803 is further disposed on an outer side of the driving gear 801, the driving gear 801 is driven to rotate through the belt 802, the driving gear 801 rotates to drive the driving rack 604 to move, so that the forward and backward movement of the bearing sleeve plate 602 is realized, and the protective cover 803 is used for covering the driving gear 801 to prevent workers in the lifting cage 2 from accidentally touching.

It is worth mentioning that in the lifting process of the cage door 501, the linkage assembly 8 synchronously drives the pedal assembly 6 to move forward and backward, after the cage door 501 is lifted and opened, the bearing sleeve plate 602 in the pedal assembly 6 and the pedal 607 slidably arranged in the bearing sleeve plate 602 synchronously move outwards, so that the gap between the lifting cage 2 and the floor 3 is filled, the safety is improved for workers to get in and out of the lifting cage 2, accidental tripping or stepping on the ground is prevented, meanwhile, the pedal 607 is provided with a plurality of groups in the vertical direction of the bearing sleeve plate 602, when the horizontal plane of the bearing sleeve plate 602 and the floor are not on the same horizontal plane, the pedal 607 under the bearing sleeve plate 602 still ensures that the bearing sleeve plate 602 can move outwards smoothly by virtue of the compression return spring 608 (the state is shown in fig. 9), the situation that the bearing sleeve plate is blocked against the ground and the effective lap joint cannot be carried out is prevented, and the arrangement further improves the applicability and the multiple scenes of the lifter.

The working principle of the utility model is as follows:

the construction worker enters the lifting cage 2 at the ground floor layer, presses the opening and closing door button to close the cage door 501, then slides the control stop block 402 rightward, at the moment, the control stop block 402 shields the opening and closing door button in the cage and leaks the lifting button, the worker can press the lifting button to control the lifting cage 2 to ascend, the lifting cage 2 stops after ascending to the corresponding floor, the construction worker slides the control stop block 402 leftward again, at the moment, the control stop block 402 shields the lifting button in the cage and leaks the opening and closing door button, the control stop block 402 also drives the clamping rod 702 to be clamped into the clamping groove of the safety door 301 in the leftward sliding process, the worker presses the opening and closing door button, the servo motor positively transmits to pull the cage door 501 to be opened through the lifting rope, and the safety door 301 synchronously follows the cage door 501 to be opened under the clamping fit of the clamping rod 702 and the clamping groove 302; meanwhile, in the process of opening the cage door 501, the pedal assembly 6 is driven to move out outwards through the linkage assembly 8, the pedal assembly 6 is used for overlapping a gap between the lifting cage 2 and the floor 3, a worker can safely go in and out of the lifting cage 2 by stepping on the pedal assembly 6, and the descending process of the lifting cage 2 is the same as the principle, and is not described in detail here.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "front and rear", "left and right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or component in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the utility model.

Of course, in this disclosure, those skilled in the art will understand that the term "a" or "an" is to be interpreted as "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, and in another embodiment, the number of elements may be multiple, and the term "a" is not to be construed as limiting the number.

While the utility model has been described with reference to the preferred embodiments, it should be understood that the utility model is not limited to the embodiments described above, but various changes and modifications can be made without departing from the structure of the utility model, and it should be understood that the scope of the utility model is not limited to the embodiments described above.

Claims

1. The building construction elevator comprises a guide rail frame (1), a lifting cage (2) arranged on the guide rail frame (1) and a safety door (301) arranged in a floor (3) and matched with the lifting cage (2), and is characterized in that a control component (4), a cage door component (5) and a pedal component (6) are arranged in the lifting cage (2), a clamping component (7) is further arranged on the outer side of the cage door component (5), the clamping component (7) comprises a sliding sleeve (701) and a clamping rod (702) arranged in the sliding sleeve (701) in a sliding manner, a clamping groove (302) matched with the clamping rod (702) is formed in the safety door (301), the control component (4) is used for shielding a control operation button and driving the clamping rod (702) to be clamped into the clamping groove (302) in the horizontal sliding process, the cage door component (5) is driven to synchronously lift through the clamping fit of the clamping rod (702) and the clamping groove (302), and the cage door component (5) and the pedal component (6) are synchronously lifted through the clamping fit of the clamping rod (702) and the clamping groove (302), and the cage door component (8) is further arranged in the lifting component (8) in a linkage manner;

the control assembly (4) comprises a chute a (401) arranged on an operation button in the lifting cage (2), a control stop block (402) is arranged in the chute a (401) in a sliding manner, and a pushing handle block (403) is arranged on the outer end surface of the control stop block (402);

the upper end part of the control stop block (402) is fixedly connected with an extension rod (404), the outer end part of the extension rod (404) is provided with a vertical upward bolt column (405), and the side wall of the lifting cage (2) is provided with a chute b (406) matched with the extension rod (404).

2. The building construction lifter according to claim 1, wherein the cage door assembly (5) comprises a cage door (501) slidably arranged in the lifting cage (2), linear sliding blocks a (502) are fixedly connected to two sides of the bottom end portion of the cage door (501), and linear guide rails a (503) matched with the linear sliding blocks a (502) are fixedly arranged in the side walls of the lifting cage (2).

3. The building construction lifter according to claim 2, wherein the cage door assembly (5) further comprises a servo motor (504) fixedly arranged at the upper top of the lifting cage (2), an output end of the servo motor (504) is fixedly connected with a rotating shaft (505), a pair of winding discs (506) matched with the cage door (501) are fixedly arranged on the rotating shaft (505), guide wheels (507) matched with the winding discs (506) are fixedly arranged on two sides of the lifting cage (2), and a plurality of lifting rope traction blocks (508) are arranged at the lower end parts of two sides of the cage door (501).

4. A building construction elevator according to claim 3, wherein the clamping assembly (7) comprises a sliding sleeve (701) arranged on the outer wall of the cage door (501) and a clamping rod (702) arranged in the sliding sleeve (701) in a sliding manner, a bolt hole (703) matched with the bolt post (405) is formed in the lower end face of the clamping rod (702), and a reinforcing rib (704) is fixedly arranged on the clamping rod (702).

5. A building construction elevator according to claim 4, wherein the safety door (301) is slidably arranged in the floor (3) in a vertical direction, and the clamping groove (302) comprises two lifting blocks (303) fixedly arranged on the outer wall of the safety door (301).

6. The building construction elevator according to claim 5, wherein the pedal assembly (6) comprises a pedal groove (601) and a bearing sleeve plate (602) arranged in the pedal groove (601), a pair of linear sliding blocks b (603) are fixedly connected to the lower end face of the bearing sleeve plate (602), a pair of linear guide rails b (604) matched with the linear sliding blocks b (603) are fixedly arranged on the bearing bottom face of the lifting cage (2), and a driving rack (605) is fixedly connected to one side of the bearing sleeve plate (602).

7. The building construction lifter according to claim 6, wherein a plurality of groups of sliding grooves c (606) are formed in the front side surface of the bearing sleeve plate (602) in the vertical direction, a plurality of foot pedals (607) are connected in a sliding manner in the sliding grooves c (606), and the foot pedals (607) are connected with the sliding grooves c (606) through return springs (608).

8. The building construction lifter according to claim 7, wherein the linkage assembly (8) comprises a driving gear (801) fixedly arranged on the side wall of the lifting cage (2) and meshed with the driving rack (605), a rotating shaft end of the driving gear (801) is connected with the rotating shaft (505) through a belt (802), and a protective housing (803) is further arranged on the outer side of the driving gear (801).