JP7428115B2 - Parking brake for industrial vehicles - Google Patents

Description

The present invention relates to a parking brake for industrial vehicles.

Conventionally, a parking brake described in Patent Document 1 is known.
The above parking brake is applied to a forklift, which is an industrial vehicle. The parking brake includes a plurality of brake discs housed in a brake housing. A pressing plate is arranged on one side of the plurality of brake disc groups. The brake housing is provided to cover a portion of the drive shaft of the forklift. Inside the brake housing, brake discs that engage with the drive shaft and brake discs that engage with the brake housing are alternately arranged one on top of the other.

A parking brake includes a lever, a support body that swingably supports the lever, a parking brake lever as a brake operating tool that is connected to the lever via a cable, and an energizing force that is engaged with the lever and the support body. It includes a spring, which is an example of a member. The lever has a pressing portion. When the parking brake lever is operated to the position where the parking brake is activated, the cable pulls the lever, causing the lever to swing and the pressing part to press the pressing plate. As a result, the brake disc that engages with the drive shaft and the brake disc that engages with the brake housing are brought into pressure contact, and the parking brake is activated. At this time, the spring expands. Therefore, when the parking brake is in operation, the expansion of the spring causes a biasing force to act on the lever toward a position where the pressure contact between the plurality of brake discs is released.

When the parking brake lever is operated to the position where the parking brake is released, the spring biases the lever so that it swings in the opposite direction to the direction in which the cable pulls the lever. Then, the pressure contact between the brake disc that engages with the drive shaft and the brake disc that engages with the brake housing is released, and the parking brake is released. Note that regardless of the operating position of the parking brake lever, a spring always acts on the lever in the direction of releasing the pressure contact between the plurality of brake discs.

Japanese Patent Application Publication No. 2007-145202

However, when the parking brake is released, the position of the lever may be adjusted in the direction in which the lever swings in order to adjust the gap between adjacent brake discs. At this time, when the distance between the lever and the support body increases and the spring extends, the biasing force of the spring increases and the operating force of the parking brake increases. Furthermore, when the spring contracts due to the shortening of the distance between the lever and the support, the biasing force of the spring becomes smaller, and the operating force of the parking brake becomes smaller. That is, in the direction in which the lever swings, the operating force of the parking brake lever may change before and after adjusting the position of the lever.

A parking brake for an industrial vehicle that solves the above problems includes a plurality of brake discs arranged one on top of the other, a rod having a pressing part for bringing the adjacent brake discs into pressure contact with each other, and a lever that rotates integrally with the rod. A lever having a main body, a support body that swingably supports the lever, a brake operating tool connected to the lever main body via a cable, and a brake operating tool connected to the rod and switching its position with respect to the lever main body. a biasing member having a first end connected to the support and a second end connected to the bracket; and an integral rocking member in which the lever body and the bracket rock together. a connecting member that connects the rod and the bracket so as to be able to switch between a swinging state and a relative swinging state in which the lever body and the bracket swing relative to each other, and in the integral swinging state, The biasing member biases the lever body via the bracket in a direction opposite to the direction in which the cable pulls the lever body in the relative swing state. The lever body is made swingable with respect to the bracket while the biasing force of the biasing member is applied to the bracket.

According to this, when adjusting the position of the lever in order to adjust the gap between adjacent brake discs, the lever main body and the bracket are brought into a relative rocking state by the connecting member. At this time, the position of the lever main body can be adjusted by swinging only the lever main body without swinging the bracket. That is, it is possible to suppress the length of the spring from changing by adjusting the position of the lever. After adjusting the position of the lever, the lever body and the bracket are brought into a state of integral rocking again by the connecting member. Therefore, changes in the expansion and contraction state of the biasing member before and after adjusting the position of the lever are suppressed. That is, the biasing force of the biasing member transmitted to the brake operating tool does not change significantly before and after adjusting the position of the lever. Therefore, changes in the operating force of the brake operating tool can be suppressed.

In the above-mentioned parking brake for an industrial vehicle, the bracket has a connecting part connected to the rod by the connecting member, and a plate shape extending from the connecting part, and the second end of the biasing member is connected to the connecting part. an extending portion, and when the connecting member is a first connecting member, the extending portion and the lever body are connected so as to be able to switch between the integral rocking state and the relative rocking state. a second connecting member, a hole through which the second connecting member is inserted is formed in the extending portion, and a tip of the second connecting member can swing integrally with the lever main body. It is preferable that the second connecting member is fixed to the lever main body in such a manner that the second connecting member is movable inside the hole relative to the extending portion in the relative swinging state.

According to this, when adjusting the position of the lever, the lever body is swung relative to the extension portion in a relative swiveling state. At this time, the second connecting member moves integrally with the lever main body while moving inside the hole of the extension portion. Therefore, if the lever body is swung more than necessary when adjusting the position of the lever without changing the expansion/contraction state of the biasing member, the second connecting member will be locked to the inner circumferential surface of the hole. Therefore, it is possible to prevent the lever body from swinging more than necessary with respect to the bracket.

In the above-mentioned parking brake for an industrial vehicle, the biasing member is a spring, the second end has a ring shape, and a tip of the extension part extends toward the lever main body, and A locking portion inserted into the second end is provided, and a groove extending in the swinging direction of the lever body and recessed from the outer surface of the lever body is formed in the lever main body, and the locking portion The tip may be located within the groove.

According to this, the locking portion is inserted into the second end of the spring, and the tip of the locking portion is located within the groove. Therefore, even if the second end of the spring moves to the tip of the locking portion, the second end of the spring does not pass between the tip of the locking portion and the outer surface of the lever body. Therefore, the spring becomes difficult to separate from the bracket.

According to this invention, changes in the operating force of the brake operating tool can be suppressed.

Schematic diagram of a parking brake for an industrial vehicle. FIG. 2 is an exploded perspective view of a parking brake for an industrial vehicle. A perspective view of a parking brake for an industrial vehicle. Front view of the lever body and bracket. A sectional view taken along line 5-5 in FIG. 4.

An embodiment of a parking brake for an industrial vehicle will be described below with reference to FIGS. 1 to 5. The parking brake for an industrial vehicle of this embodiment is mounted on, for example, a forklift, and is used to brake a drive shaft that is a member that constitutes a drive transmission path from an engine (not shown) to wheels.

As shown in FIG. 1, the parking brake 1 for an industrial vehicle includes a brake housing 101 and a plurality of brake discs 10 arranged one above the other. The brake housing 101 is provided so as to partially cover a drive shaft 102 rotatably supported at the bottom of the forklift. A plurality of brake discs 10 are housed inside the brake housing 101. The plurality of brake discs 10 include a first brake disc 11 that is movable in the axial direction of the drive shaft 102 and engaged with the drive shaft 102 in a manner that prevents relative rotation. The plurality of brake discs 10 include a second brake disc 12 that is movable in the axial direction of the drive shaft 102 with respect to the brake housing 101 and engages with the brake housing 101 in a manner that prevents relative rotation. Inside the brake housing 101, the first brake discs 11 and the second brake discs 12 are arranged alternately one on top of the other. In the axial direction of the drive shaft 102, a pressing plate 103 is arranged one on top of the other on one side of the plurality of brake discs 10 groups. The inside of the brake housing 101 is filled with lubricating oil. That is, the industrial vehicle parking brake 1 is a wet type brake. Although it appears that all of the plurality of brake discs 10 shown in FIG. A gap is formed. Further, when the industrial vehicle parking brake 1 is operating, the first brake disc 11 and the second brake disc 12 are brought into pressure contact.

The parking brake 1 for an industrial vehicle includes a support body 20 that is a plate-like member, a lever 30, a toggle lever 40 as a brake operating tool, and a spring 50 as a biasing member.

The support body 20 is arranged near the pressing plate 103. The support body 20 is fixed to the vehicle body of the forklift by a fixing member (not shown), so that its positional relationship with the press plate 103 does not change. The support body 20 has a first surface 21 on one side in the thickness direction and a second surface 22 on the other side in the thickness direction. The first surface 21 of the support body 20 is a surface facing the brake housing 101. The plurality of brake discs 10 and pressing plates 103 are arranged near the first surface 21 of the support body 20.

The lever 30 has a base 31, a rod 32, and a lever body 33.
The base 31 is rotatably supported by the support 20. The base portion 31 has a cylindrical shape. The base 31 is provided on the first surface 21 of the support 20 . The base portion 31 penetrates the support body 20 in the thickness direction.

The rod 32 is inserted through the inner peripheral surface of the base 31. The rod 32 is provided integrally with the base 31. The rod 32 passes through the support 20 in the thickness direction. The first end 32 a of the rod 32 extends to a position adjacent to the press plate 103 in the axial direction of the drive shaft 102 . As shown in FIG. 2, the second end 32b of the rod 32 extends toward the second surface 22 of the support 20. As shown in FIG.

As shown in FIG. 1, the rod 32 rotates together when the base 31 rotates relative to the support 20. As shown in FIG. The rotation axis O of the base portion 31 and the rod 32 extends in the thickness direction of the support body 20. The first end 32a of the rod 32 has a pressing portion 32d closer to the pressing plate 103. The pressing portion 32d approaches or separates from the pressing plate 103 when the rod 32 rotates around the rotation axis O. The pressing portion 32d is a protruding portion that projects from the rod 32 toward the pressing plate 103. The pressing portion 32d is always in contact with the pressing plate 103.

As shown in FIGS. 1 and 2, the lever main body 33 is provided on the second surface 22 side of the support body 20. The lever main body 33 extends from the second end 32b of the rod 32 along the second surface 22 of the support body 20. The lever main body 33 is provided integrally with the second end 32b of the rod 32. The lever main body 33 extends in a direction away from the rod 32. The lever main body 33 swings integrally when the rod 32 rotates with respect to the support body 20. Here, the direction in which the tip end 33a of the lever body 33 swings about the rotation axis O is defined as a swing direction A. Since the base 31, the rod 32, and the lever main body 33 are integrally provided and are rotatable relative to the support 20, the lever 30 is swingably supported by the support 20.

The support body 20 has a first fixing part 23 and a second fixing part 24. The first fixing part 23 and the second fixing part 24 are provided at a position where the lever main body 33 is interposed in the swing direction A. The first fixing portion 23 has a plate shape. The first fixing portion 23 is provided at a position where the tip end 33a of the lever body 33 approaches when the pressing portion 32d of the rod 32 approaches the pressing plate 103. The first fixing portion 23 extends toward the second surface 22 in the thickness direction of the support body 20 .

The second fixing portion 24 has a plate shape. The second fixing portion 24 is provided at a position where the tip 33a of the lever body 33 approaches when the pressing portion 32d of the rod 32 is separated from the pressing plate 103. The second fixing portion 24 protrudes from the second surface 22 of the support body 20.

The toggle lever 40 is an operating lever that switches between a brake release position P1 in which the industrial vehicle parking brake 1 is activated and a brake position P2 in which the industrial vehicle parking brake 1 is not activated. A first end 41 a of a cable 41 is connected to the toggle lever 40 . The second end 41b of the cable 41 is connected to the tip 33a of the lever body 33. The toggle lever 40 is connected to the lever body 33 via a cable 41. A portion of the cable 41 between the first end 41a and the second end 41b is fixed to the first fixing part 23 by a fixture F. The fixture F is fixed to the first fixing part 23 so that the cable 41 is movable.

Spring 50 is a tension coil spring. The spring 50 is provided between the lever body 33 and the second fixing part 24 in the swing direction A. The first end 51 of the spring 50 is fixed to the second fixing part 24. The spring 50 constantly generates a biasing force that biases the lever body 33 to swing toward the second fixing portion 24 .

In the industrial vehicle parking brake 1 configured as described above, when the toggle lever 40 is operated from the brake release position P1 to the brake position P2, the cable 41 pulls the tip 33a of the lever body 33 toward the first fixing portion 23. Then, the tip 33a of the lever body 33 swings toward the first fixing portion 23 in the swing direction A. As the lever body 33 swings, the rod 32 swings around the rotation axis O, and the pressing portion 32d of the rod 32 presses the pressing plate 103. The drive shaft 102 is braked against the brake housing 101 by the pressing portion 32d of the rod 32 bringing the adjacent first brake disc 11 and second brake disc 12 into pressure contact. That is, the industrial vehicle parking brake 1 is activated. Note that when the toggle lever 40 is operated from the brake release position P1 to the brake position P2, the urging force of the spring 50 is transmitted to the toggle lever 40 as the operating force of the toggle lever 40.

When the toggle lever 40 is operated from the brake position P2 to the brake release position P1, the spring 50 urges the lever body 33 toward the second fixing portion 24. That is, the spring 50 urges the lever body 33 in the opposite direction to the direction in which the cable 41 pulls the lever body 33. Then, the pressing part 32d swings together with the rod 32 in the direction away from the pressing plate 103, the pressure contact between the first brake disc 11 and the second brake disc 12 is released, and the drive shaft 102 rotates with respect to the brake housing 101. Become free. That is, the industrial vehicle parking brake 1 is released.

Here, the size of the gap formed between the plurality of brake discs 10 due to the thickness tolerance of the plurality of brake discs 10 may be smaller than the specified value at the time of designing the parking brake 1 for an industrial vehicle. . Further, by continuing to use the parking brake 1 for industrial vehicles, the plurality of brake discs 10 may wear out, and the size of the gap formed between the plurality of brake discs 10 may become larger than the specified value. . Therefore, it is necessary to adjust the size of the gap formed between the plurality of brake discs 10 to a specified value when the industrial vehicle parking brake 1 is not operating. This adjustment involves swinging the lever body 33 in the swinging direction A, changing the degree of pressing of the pressing portion 32d against the pressing plate 103, and adjusting the gap between the first brake disc 11 and the second brake disc 12. This indicates that the size should be brought closer to the specified value. Here, the parking brake 1 for an industrial vehicle includes an adjustment mechanism 65 that adjusts the gap formed between the first brake disc 11 and the second brake disc 12. The adjustment mechanism 65 includes a bolt 66 that passes through the second fixing portion 24 of the support body 20 in the thickness direction. The bolt 66 passes through the second fixing portion 24 and is always in contact with the lever body 33. By threading the bolt 66 toward the lever body 33, the tip 33a of the lever body 33 swings toward the first fixed portion 23, and the pressing portion 32d is pressed against the pressing plate 103. Threading the bolt 66 toward the lever body 33 is an adjustment to reduce the gap between the plurality of brake discs 10. Screwing back the bolt 66 in the direction away from the lever body 33 is an adjustment that increases the gap between the plurality of brake discs 10.

By the way, if the spring 50 is fixed to the lever main body 33 and the second fixing part 24, if the lever main body 33 is swung to adjust the gap between the plurality of brake discs 10, the plurality of brake discs 10 The expansion and contraction state of the spring 50 changes before and after adjusting the gap between them. That is, there is a possibility that the operating force transmitted to the toggle lever 40 may change. In this embodiment, a configuration is adopted that suppresses changes in the operating force of the toggle lever 40, and this point will be described in detail below.

As shown in FIG. 2, the lever main body 33 has a cylindrical shaft portion 34 and a long plate portion 35. The second end portion 32b of the rod 32 is inserted through the inner peripheral surface of the shaft portion 34. A rod 32 is integrally provided on the shaft portion 34 . The shaft portion 34 rotates integrally with the rod 32. The second end 32b of the rod 32 has a female threaded hole 32c having a depth along the rotation axis O. The female screw hole 32c opens on the side opposite to the second surface 22 of the support body 20.

The long plate portion 35 has a thickness in the same direction as the thickness direction of the support body 20. The long plate portion 35 extends from the outer peripheral surface of the shaft portion 34 along the second surface 22 of the support body 20 . The long plate portion 35 is provided in the middle of the outer peripheral surface of the shaft portion 34 in the direction in which the axis of the shaft portion 34 extends. That is, a step is formed by the end surface of the shaft portion 34 opposite to the second surface 22 of the support body 20 and the end surface of the long plate portion 35 located on the opposite side to the second surface 22 of the support body 20. There is.

The end of the long plate portion 35 opposite to the shaft portion 34 is the tip 33a of the lever body 33. The long plate portion 35 extends in a direction away from the rotation axis O, that is, in a direction away from the rod 32. The long plate portion 35 is provided with a female screw hole 35a and a groove 36 between the shaft portion 34 and the tip 33a. The female screw hole 35a and the groove 36 are provided on an end surface 35b of the long plate section 35 located on the opposite side to the second surface 22 of the support body 20 in the thickness direction of the long plate section 35. In a plan view of the elongated plate portion 35 in the thickness direction, the direction from the shaft portion 34 of the elongated plate portion 35 toward the tip 33a is defined as a first extension direction D1. The female threaded hole 35a and the groove 36 are arranged in this order on the long plate portion 35 in the first extension direction D1. In a plan view of the long plate portion 35 in the thickness direction, the groove 36 has an arc shape extending in the swinging direction A of the lever body 33. In a plan view of the long plate portion 35 in the thickness direction, the groove 36 is recessed from the end surface 35b of the long plate portion 35 as the outer surface of the lever main body 33. No openings at the edges. That is, the groove 36 opens toward the side opposite to the support body 20 in the thickness direction of the long plate portion 35 .

The parking brake 1 for an industrial vehicle includes a bracket 60, a first connecting member 71, and a second connecting member 72.
The bracket 60 is arranged to overlap the lever main body 33. The bracket 60 is a plate member having a thickness in the same direction as the thickness direction of the support body 20. The bracket 60 has a connecting portion 61 and an extending portion 62. The connecting portion 61 is arranged to overlap the shaft portion 34 and the second end portion 32b of the rod 32. The connecting portion 61 has a disk shape and has an insertion hole 61a that corresponds to the female threaded hole 32c of the rod 32. The insertion hole 61a penetrates the connecting portion 61 in the thickness direction. The extending portion 62 has a long plate shape extending from the connecting portion 61 . The bracket 60 extends in a direction away from the rotation axis O, that is, in a direction away from the rod 32. The extending portion 62 overlaps with the lever body 33 in the direction in which the rotation axis O extends. The extending portion 62 has a long plate shape extending along the lever main body 33. The tip of the extending portion 62 is arranged at a position corresponding to the groove 36 in the thickness direction of the extending portion 62.

In the extending portion 62, a widened portion 62a is provided between the connecting portion 61 and the tip of the extending portion 62. The direction from the connecting portion 61 to the tip of the extending portion 62 is defined as a second extending direction D2. The widened portion 62a is a portion where a part of the extended portion 62 is widened in a direction perpendicular to the second extending direction D2. A hole 62b is provided in the widened portion 62a. The hole 62b penetrates the extending portion 62 in the thickness direction. The hole 62b is a long hole extending in a direction perpendicular to the second extending direction D2. The hole 62b is provided at a position corresponding to the female screw hole 35a in the thickness direction of the extension portion 62.

As shown in FIGS. 3 and 5, the bracket 60 has a locking portion 63. As shown in FIGS. A locking portion 63 is provided at the tip of the extending portion 62 . The locking portion 63 has a shaft shape that passes through the tip of the extending portion 62 in the thickness direction. The tip of the locking portion 63 is located within the groove 36. The first end 51 and second end 52 of the spring 50 are both ring-shaped. A first end 51 of the spring 50 is connected to the second fixing portion 24 . A locking portion 63 is inserted through the second end portion 52 of the spring 50 . A second end 52 of the spring 50 is connected to a bracket 60. That is, the spring 50 includes a first end 51 connected to the second fixing part 24 and a second end 52 connected to the bracket 60.

As shown in FIGS. 2 and 3, the first connecting member 71 and the second connecting member 72 are bolts. The first connecting member 71 is inserted into the insertion hole 61 a of the connecting portion 61 of the bracket 60 and is screwed into the female threaded hole 32 c of the rod 32 . The connecting portion 61 is connected to the second end 32b of the rod 32 by the first connecting member 71. The first connecting member 71 is a connecting member that connects the bracket 60 and the rod 32.

A cylindrical spacer 80 is interposed between the extending portion 62 and the long plate portion 35. The spacer 80 suppresses the extension portion 62 from bending toward the long plate portion 35 . The second connecting member 72 is inserted into the hole 62b of the extending portion 62 and inside the spacer 80, and is screwed into the female threaded hole 35a of the long plate portion 35. The second connecting member 72 connects the extending portion 62 and the lever main body 33. Since the tip of the second connecting member 72 is screwed into the female screw hole 35a of the long plate portion 35, the second connecting member 72 is fixed to the lever body 33 so as to be able to swing integrally with the lever body 33. has been done.

When the first connecting member 71 is completely screwed into the female screw hole 32c, the first connecting member 71 connects the connecting portion 61 and the shaft portion 34 so that the connecting portion 61 and the shaft portion 34 swing together. do. When the second connecting member 72 is completely screwed into the female screw hole 35a, the second connecting member 72 connects the extended portion 62 and the long plate portion so that the extended portion 62 and the long plate portion 35 swing together. 35.

When the first connecting member 71 is inserted into the insertion hole 61a of the connecting portion 61 and loosened with the first connecting member 71 screwed into the female screw hole 32c, the first connecting member 71 connects the connecting portion 61 and the shaft portion 34. The connecting portion 61 and the shaft portion 34 are connected so that the connecting portion 61 and the shaft portion 34 swing relative to each other. When the second connecting member 72 is inserted into the hole 62b of the extending portion 62 and loosened with the second connecting member 72 screwed into the female screw hole 35a, the second connecting member 72 is connected to the extending portion 62 and the long plate. The extension part 62 and the long plate part 35 are connected so that the part 35 swings relative to each other.

Depending on the tightness of the first connecting member 71 and the second connecting member 72, it is possible to switch between making the lever body 33 and the bracket 60 swing together or relative to each other. Therefore, the first connecting member 71 can be switched between an integral rocking state in which the lever body 33 and the bracket 60 rock together, and a relative rocking state in which the lever body 33 and the bracket 60 rock relative to each other. The rod 32 and bracket 60 are connected to each other. The second connecting member 72 has two states: an integral swinging state in which the long plate portion 35 and the extension portion 62 swing integrally, and a relative swinging state in which the long plate portion 35 and the extension portion 62 swing relative to each other. The long plate part 35 and the extension part 62 are connected to each other so as to be able to switch. The position of the bracket 60 relative to the lever body 33 can be changed.

In the parking brake 1 for an industrial vehicle, the spring 50 biases the lever body 33 via the bracket 60 in the integral rocking state, and the biasing force of the spring 50 is applied to the bracket 60 in the relative rocking state. The lever main body 33 is swingable relative to the bracket 60.

The operation of this embodiment will be explained.
For example, consider a case where the position of the lever 30 is adjusted in order to increase the gap between the plurality of brake discs 10.

As shown in FIG. 4, by loosening the first connecting member 71 and the second connecting member 72 while the industrial vehicle parking brake 1 is not operating, the lever body 33 and the bracket 60 are brought into a relative swinging state. . In the relative swing state, the bolt 66 is screwed back so as to be separated from the lever body 33. At this time, the biasing force of the spring 50 acts on the bracket 60, and the biasing force of the spring 50 does not act on the lever body 33. That is, when the bolt 66 is screwed back so as to be separated from the lever body 33, a gap is formed between the tip of the bolt 66 and the lever body 33. At this time, if the lever main body 33 is swung so as to come into contact with the tip of the bolt 66 as shown by the broken line in FIG. 4 without swiveling the bracket 60, the degree of pressing of the pressing plate 103 of the pressing part 32d will change. The lever 30 swings so as to weaken. Therefore, the position of the lever 30 is adjusted so that the gap between the first brake disc 11 and the second brake disc 12 becomes larger.

When the lever body 33 is swung so as to come into contact with the tip of the bolt 66, the second connecting member 72 moves from the first end 621 to the second end 622 of the hole 62b in the direction orthogonal to the second extending direction D2. move towards. That is, in the relative swing state, the second connecting member 72 moves inside the hole 62b relative to the extension portion 62.

After adjusting the gap between the first brake disc 11 and the second brake disc 12, the first connecting member 71 is completely screwed into the female threaded hole 32c, and the second connecting member 72 is completely screwed into the female threaded hole 35a. Then, the lever main body 33 and the bracket 60 are in a state of integral rocking, and the position adjustment of the lever 30 is completed. Therefore, before and after adjusting the position of the lever 30, the length of the spring 50 is difficult to change based on the swinging of the lever body 33, and the expansion and contraction state does not change. Note that even when adjusting to reduce the gap between the plurality of brake discs 10, the length of the spring 50 is difficult to change based on the swinging of the lever body 33 before and after adjusting the position of the lever 30. .

The effects of this embodiment will be explained.
(1) When adjusting the position of the lever 30 to adjust the gap between adjacent brake discs 10, the first connecting member 71 and the second connecting member 72 cause the lever body 33 and the bracket 60 to be in a relative swing state. At this time, the position of the lever main body 33 can be adjusted by swinging only the lever main body 33 without swinging the bracket 60. That is, it is possible to suppress the length of the spring 50 from changing by adjusting the position of the lever 30. After adjusting the position of the lever 30, the lever body 33 and the bracket 60 are brought into a state of integral rocking again by the first connecting member 71 and the second connecting member 72. Therefore, changes in the expansion and contraction state of the spring 50 are suppressed before and after adjusting the position of the lever 30. That is, the biasing force of the spring 50 transmitted to the toggle lever 40 does not change significantly before and after adjusting the position of the lever 30. Therefore, changes in the operating force of the toggle lever 40 can be suppressed.

(2) When adjusting the position of the lever 30, the lever body 33 is swung relative to the extension portion 62 in a relative swiveling state. At this time, the second connecting member 72 moves integrally with the lever main body 33 while moving inside the hole 62b of the extension portion 62. Therefore, if the lever main body 33 is swung more than necessary when adjusting the position of the lever 30 without changing the expansion/contraction state of the spring 50, the second connecting member 72 may The first end 621 and the second end 622 are locked. Therefore, it is possible to suppress the lever body 33 from swinging more than necessary with respect to the bracket 60.

(3) The locking portion 63 is inserted into the second end portion 52 of the spring 50, and the tip of the locking portion 63 is located within the groove 36. Therefore, even if the second end 52 of the spring 50 moves to the tip of the locking portion 63, the second end 52 of the spring 50 moves between the tip of the locking portion 63 and the end surface 35b of the long plate portion 35. Don't pass. Therefore, the spring 50 becomes difficult to separate from the bracket 60.

Note that this embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
Although the groove 36 has an arcuate shape extending in the swing direction A, the shape may be changed as appropriate as long as the tip of the locking portion 63 can move smoothly inside the groove 36.

○ The locking portion 63 of the bracket 60 may be omitted. The second end portion 52 of the spring 50 may be connected to the tip of the extension portion 62 .
Although the hole 62b is a long hole, it may be changed to a circular arc hole extending in the swing direction A, for example.

Although the hole 62b is formed by the widened portion 62a of the extension portion 62, the hole 62b may be formed with the widened portion 62a omitted.
○ The second connecting member 72 may be omitted. In this case, the spacer 80, the hole 62b of the extension part 62, and the female screw hole 35a of the long plate part 35 may be omitted.

○ By providing a convex portion on the end surface 35b of the lever body 33, the spacer 80 may be omitted.
In the present embodiment, the shaft portion 34 of the lever body 33 is inserted through the second end portion 32b of the rod 32, but the invention is not limited thereto. For example, the long plate portion 35 may be provided directly on the outer peripheral surface of the second end portion 32b of the rod 32. At this time, the lever main body 33 is constituted by a long plate portion 35.

In this embodiment, the base 31 may be omitted from the lever 30. The lever 30 only needs to be composed of a rod 32 and a lever main body 33. The rod 32 is changed so that it is rotatably supported by the support body 20.

○ Although the spring 50 is used as the biasing member, a rubber member or the like may be used as the biasing member as long as it can always bias the tip 33a of the lever body 33 toward the second fixing part 24. .

Although the adjustment mechanism 65 is a bolt 66, it may be changed as appropriate as long as it has a configuration that can maintain a constant distance from the second fixing portion 24 when adjusting the position of the lever body 33.
○ It is not necessary to fill the brake housing 101 with lubricating oil. Any configuration may be used as long as the first brake disc 11 and the second brake disc 12 are brought into pressure contact with each other.

○ The first fixing part 23 may be composed of only the first plate part 23a.
Although the industrial vehicle parking brake 1 has been mounted on a forklift, the present invention is not limited to this, and may be mounted on a towing tractor or the like.

DESCRIPTION OF SYMBOLS 1... Parking brake for industrial vehicles, 10... Brake disc, 11... First brake disc, 12... Second brake disc, 20... Support body, 30... Lever, 31... Base, 32... Rod, 32d... Pressing part, 33 ... Lever body, 34 ... Shaft, 35 ... Long plate part, 36 ... Groove, 40 ... Toggle lever, 41 ... Cable, 50 ... Spring, 51 ... First end, 52 ... Second end, 60 ... Bracket, 61... Connecting part, 62... Extension part, 62b... Hole, 63... Locking part, 71... First connecting member, 72... Second connecting member, A... Swinging direction.

Claims (3)

Multiple brake discs arranged one on top of the other,
a rod having a pressing portion for bringing the adjacent brake discs into pressure contact with each other; and a lever having a lever body that rotates integrally with the rod;
a support that swingably supports the lever;
a brake operating tool connected to the lever body via a cable;
a bracket that is connected to the rod and whose position relative to the lever body can be switched;
a biasing member having a first end connected to the support and a second end connected to the bracket;
The rod and the bracket are connected so that the lever body and the bracket can be switched between an integral rocking state in which the lever body and the bracket rock together and a relative rocking state in which the lever body and the bracket relatively rock. a connecting member,
In the integrally swinging state, the biasing member biases the lever body via the bracket in a direction opposite to a direction in which the cable pulls the lever body as the brake operating tool is operated. ,
The parking brake for an industrial vehicle is characterized in that, in the relative swinging state, the lever main body is allowed to swing relative to the bracket while a biasing force of the biasing member is applied to the bracket. The bracket is
a connecting portion connected to the rod by the connecting member;
an extending part having a plate shape extending from the connecting part and to which the second end of the biasing member is connected;
When the connecting member is a first connecting member,
a second connecting member connecting the extension portion and the lever main body so as to be able to switch between the integral rocking state and the relative rocking state;
A hole through which the second connecting member is inserted is formed in the extending portion,
The tip of the second connecting member is fixed to the lever main body so as to be able to swing integrally with the lever main body,
2. The parking brake for an industrial vehicle according to claim 1, wherein the second connecting member is movable inside the hole relative to the extension part in the relative swing state. The biasing member is a spring,
the second end has a ring shape,
A locking portion that extends toward the lever body and is inserted into the second end portion is provided at the tip of the extension portion,
The lever body is formed with a groove extending in the swinging direction of the lever body and recessed from the outer surface of the lever body,
The parking brake for an industrial vehicle according to claim 2, wherein a tip of the locking portion is located within the groove.