JP2007068555A - Lifter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifter which slides smoothly by correcting slack of a lifter wire 39 and reliably prevents the falling when the lifter wire is cut off. <P>SOLUTION: The lifter 24 is equipped with a main body 36 of the lifter, a wire arm 37 provided on the main body 36 of the lifter, a braking mechanism 38, and a wire correcting mechanism 40 absorbing the slack of the lifter wire 39. The lifter wire 39 is connected to the wire arm 37, and the lifter wire 39 is put around a pulley 80. When the lifter wire 39 is cut off, the wire arm 37 rotates leftward, and the braking mechanism 38 (a brake cam 73, specifically) is activated. If the slack occurs momentarily on the lifter wire 39, the slack of the lifter wire 39 is eliminated by the pulley 80 sliding to the right side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of a lifter mounted on a fire engine with a ladder or the like.

  Conventionally, a ladder-equipped fire engine is equipped with a lifter (see, for example, Patent Document 1 and Patent Document 2). FIG. 11 is a side view of a conventional fire engine 1 with a ladder, in which the lifter 2 is slid along the ladder 3. FIGS. 12, 13 and 14 are a front view, a side view and a bottom view of the conventional lifter 2, respectively.

  As shown in FIG. 11, the ladder 3 is supported by a ladder frame 4, and the ladder frame 4 is supported by a support frame 6 via an undulating central axis 5. The ladder frame 4 can be rotated about the undulation center axis 5, whereby the ladder 3 can be raised and lowered together with the ladder frame 4. On the other hand, as shown in FIGS. 12 to 14, the lifter 2 generally has a frame structure in which a plurality of rod-shaped members are combined, and is formed in a box shape. The lifter 2 is engaged with the ladder 3 and is slidable along the upper surface 7 of the ladder 3. (See FIG. 11).

  As shown in FIG. 12, one end of the lifter wire 9 is connected to the lifter 2. The other end of the lifter wire 9 is wound around a wire drum 8 provided on the ladder frame 4 (see FIG. 11). Therefore, the lifter 2 is suspended by the lifter wire 9, and when the lifter wire 9 is wound up by the forward rotation of the wire drum 8, the lifter 2 is, as shown in FIG. Ascend along the ladder 3. Further, when the lifter wire 9 is fed out by reversing the wire drum 8, the lifter 2 is lowered along the ladder 3.

  By the way, as FIG.12 and FIG.13 shows, the conventional lifter 2 is equipped with the brake 10 for fall prevention. The fall prevention brake 10 is mainly for preventing the lifter 2 from dropping when the lifter wire 9 is cut. The fall-preventing brake 10 includes a fan-shaped brake cam 11, a rotating arm 14 to which a lifter wire 9 is connected, a connecting rod 15 that connects the rotating arm 14 and the brake cam 11, and the connecting rod 15. And a spring 16 connected to the.

  Usually, tension is generated on the lifter wire 9 due to the lifting force of the lifter 2. With this tension, the rotating arm 14 rotates clockwise around the support shaft 17 in FIG. As a result, the spring 16 is stretched and the brake cam 11 rotates counterclockwise via the connecting rod 15. Therefore, in this state, the brake cam 11 does not contact the ladder 3.

  However, when the tension of the lifter wire 9 is lower than a predetermined size (for example, when the lifter wire 9 is cut or the standing angle of the ladder 3 is reduced), the lifter wire 9 is caused by the tension of the lifter wire 9. The rotational moment of the rotating arm 14 (centered on the support shaft 17 in FIG. 13) due to the elastic force of the spring 16 rather than the rotational moment of the rotating arm 14 (clockwise moment about the support shaft 17 in FIG. 13). Counterclockwise moment) increases. Accordingly, the rotating arm 14 rotates counterclockwise around the support shaft 17 and the brake cam 11 rotates clockwise via the connecting rod 15. When the brake cam 11 rotates clockwise, the tip of the brake cam 11 protrudes toward the ladder 3 and the tip of the brake cam 11 is pressed against the upper surface 7 of the ladder 3. As a result, the upper bone 12 of the ladder 3 is sandwiched between the brake cam 11 and the clamping member 13 (see FIG. 14), and a constant frictional force is generated between the brake cam 11 and the ladder 3. This frictional force reliably prevents the lifter 2 from falling.

JP 2003-290375 A JP 2004-67324 A

  As described above, since the lifter 2 is lifted by the lifter wire 9 (see FIG. 11), the tension generated in the lifter wire 9 is proportional to the standing angle of the ladder 3 and the rising angle is large. As the tension increases. Since the conventional fall-preventing brake 10 operates when the tension of the lifter wire 9 becomes smaller than a predetermined magnitude, when the standing angle of the ladder 3 is smaller than the predetermined angle, the lifter wire 9 9 is reduced, and the fall prevention brake 10 is operated. Therefore, in a conventional fire engine with a ladder, the ladder is set to be used in a range where the standing angle is equal to or larger than the predetermined angle (hereinafter, this range is referred to as “usable standing range”). There are also things.

  As shown in FIG. 14, the lifter 2 is placed on the upper bone 12 of the ladder 3, but when the lifter 2 moves up and down, it may slide in the left-right direction with respect to the ladder 3. In that case, for example, the clamping member 13 of the lifter 2 slides on the side surface of the upper bone 12, and a frictional force is generated between the lifter 2 and the upper bone 12. This frictional force acts on the lifter 2 as a resistance force when the lifter 2 moves up and down. Therefore, the suspension force of the lifter 2 acting on the lifter wire 9 is reduced by an amount corresponding to the frictional force. For this reason, the tension of the lifter wire 9 is lowered even though the ladder 3 is in the usable upright range, and as a result, the fall-preventing brake 10 may be operated.

  Further, the lifter 2 slides along the ladder 3, and the ladder 3 is generally nested in a plurality of stages (five stages in FIG. 14). When the ladder 3 has a multi-stage knitting, a minute step portion may be formed between the adjacent ladders 3 due to processing errors and assembly errors of the ladder 3. Therefore, the lifter 2 that is descending may decelerate instantaneously when passing through this step. Since the lifter 2 is lowered when the lifter wire 9 is fed out from the wire drum 8, the lifter 2 being lowered is momentarily decelerated, whereby the tension of the lifter wire 9 is rapidly reduced. There is a possibility that the lifter wire 9 bends instantaneously. Further, in the field of fire fighting activities, the lifter 2 is repeatedly raised or lowered along the ladder 3. As described above, when the lifter wire 9 is wound around the wire drum 8, the lifter 2 is raised, and when the lifter wire 9 is fed out of the wire drum 8, the lifter 2 is lowered, so that the lifter 2 that is ascending suddenly When it is lowered, there is a possibility that the lifter wire 9 is bent instantaneously. As a result of momentary bending of the lifter wire 9, the fall prevention brake 10 may be activated.

  When the fall-preventing brake 10 is operated in this way, the lifter 2 is fixed to the ladder 3 and smooth lifter operation becomes difficult, and as a result, there is a possibility that quick rescue work at the fire site becomes difficult. .

  Therefore, one object of the present invention is to ensure that when the ladder is in the usable upright range, it can be raised and lowered smoothly regardless of the standing angle, and if the lifter wire is cut, It is to provide a lifter that is prevented from falling. In addition, another object of the present invention is to smoothly move up and down even when sliding with respect to the ladder, and in the event that the lifter wire is cut, it is reliably prevented from falling. Is to provide a lifter.

  (1) Since the above one object is achieved, a lifter according to the present invention engages with an upper surface of a ladder mounted on a fire engine, and is lifted and lowered along the upper surface of the ladder, and the lifter main body If the lifter wire is connected to the wire connection part, and is connected to the wire connection part, and the tension of the lifter wire is equal to or higher than a certain value. And a lift mechanism that allows the lifter body to move up and down away from the top surface of the ladder, and that lifts the lifter body by pressing the top surface of the ladder when the lifter wire tension is lower than the above-mentioned fixed value, and the lifter A wire correction mechanism that is provided in the main body and corrects looseness of the lifter wire within a predetermined range so that the braking mechanism does not operate.

  This lifter is attached to a ladder mounted on a fire engine. The ladder is raised and lowered and expanded and contracted by a predetermined driving device, for example. The lifter body engages with the upper surface of the ladder and is lifted and lowered along the upper surface of the ladder. The lifter body is lifted and lowered while being suspended from the lifter wire. The lifter wire is connected to the wire connection portion of the lifter body. For example, the lifter body rises along the ladder by being wound by a predetermined wire winding device, and the lifter wire is also lifted from the wire winding device. The lifter body descends along the ladder.

  In general, during the operation of the lifter, since the lifting force of the lifter body acts on the lifter wire, a tension higher than a certain value is generated in the lifter wire. For this reason, the braking mechanism allows the lifter body to move up and down, and therefore the lifter can freely move up and down along the ladder. However, when the tension of the lifter wire becomes extremely smaller than a certain value during the operation of the lifter, for example, when the lifter wire is cut or the like, the braking mechanism operates to press the upper surface of the ladder. Thereby, raising / lowering of a lifter is controlled and the fall of a lifter is prevented.

  By the way, the situation of a fire field is various, a ladder is used by various standing angles and extension length, and a lifter may be used. When the ladder has a multi-stage knitting, the slide of the lifter main body may be instantaneously decelerated between adjacent ladders. In such a case, the lifting force of the lifter body acting on the lifter wire may be reduced, or the lifter wire may be loosened momentarily. Thus, even if the lifter wire is loosened momentarily due to fluctuations in the suspension force, etc., the lifter wire loosening momentarily generated is corrected by operating the wire straightening mechanism. That is, the tension of the lifter wire is ensured so that the braking mechanism does not operate. Therefore, even if the standing angle of the ladder fluctuates within the usable standing range, and even if the slide of the lifter is instantaneously decelerated or stopped between adjacent ladders, the braking mechanism does not operate, The lifter body can be moved up and down along the ladder.

  (2) The wire straightening mechanism may include a pulley around which the lifter wire is wound, and a biasing member that biases the pulley in a direction in which the slack of the lifter wire is absorbed.

  The lifter wire is wound around the pulley, and the pulley is urged by the urging member in a direction in which the slack of the lifter wire is absorbed. Therefore, even if the lifter wire is loosened momentarily, the slack is immediately absorbed by the displacement of the pulley. That is, the tension of the lifter wire is ensured so that the braking mechanism does not operate.

  (3) The biasing member is preferably a coil spring.

  By adopting a coil spring as the urging member, the structure of the urging member is very simple, and the manufacturing cost of the lifter can be kept low.

  (4) In order to achieve the above-mentioned other objects, the lifter according to the present invention engages with the upper surface of a ladder mounted on a fire engine, and is lifted and lowered along the upper surface of the ladder, and the lifter main body If the lifter wire is connected to the wire connection part, and is connected to the wire connection part, and the tension of the lifter wire is equal to or higher than a certain value. And a lift mechanism that allows the lifter body to move up and down away from the top surface of the ladder, and that lifts the lifter body by pressing the top surface of the ladder when the lifter wire tension is lower than the above-mentioned fixed value, and the lifter A tension compensation mechanism that is provided in the main body and compensates for the tension of the lifter wire so that the braking mechanism does not operate due to the frictional force generated between the ladder and the lifter main body. And.

  This lifter is attached to a ladder mounted on a fire engine. The ladder is raised and lowered and expanded and contracted by a predetermined driving device, for example. The lifter body engages with the upper surface of the ladder and is lifted and lowered along the upper surface of the ladder. The lifter body is lifted and lowered while being suspended from the lifter wire. The lifter wire is connected to the wire connection portion of the lifter body. For example, the lifter body rises along the ladder by being wound by a predetermined wire winding device, and the lifter wire is also lifted from the wire winding device. The lifter body descends along the ladder.

  In general, during the operation of the lifter, since the lifting force of the lifter body acts on the lifter wire, a tension higher than a certain value is generated in the lifter wire. For this reason, the braking mechanism allows the lifter body to move up and down, and therefore the lifter can freely move up and down along the ladder. However, when the tension of the lifter wire becomes extremely smaller than a certain value during the operation of the lifter, for example, when the lifter wire is cut or the like, the braking mechanism operates to press the upper surface of the ladder. Thereby, raising / lowering of a lifter is controlled and the fall of a lifter is prevented.

  Incidentally, since the lifter body slides on the upper surface of the ladder, a frictional force may be generated between them due to the lifter body sliding with respect to the ladder. This frictional force reduces the lifting force of the lifter, and as a result, the lifter wire tension is reduced. Thus, even if the tension of the lifter wire is reduced, the tension of the lifter wire is ensured so that the braking mechanism is not activated by the actuation of the tension compensation mechanism. Therefore, even if a frictional force is generated between the lifter main body and the ladder, the braking mechanism does not operate, and the lifter main body can be moved up and down along the ladder.

  (5) The wire connecting portion is connected to a predetermined rotation center axis provided on the lifter body at the base end portion, and the lifter wire is connected to a distal end portion, and the lifter body about the rotation center axis. A wire arm swingable between a first posture rotated in the direction of the suspension force and a second posture rotated in the direction opposite to the direction of the suspension force, and the tension compensation mechanism comprises: A rotating plate that rotates about the rotation center axis together with the wire arm, and is connected to a predetermined position of the rotating plate, and the wire arm is more than a predetermined intermediate position between the first position and the second position. When the wire arm is on the first posture side, an elastic force is applied to the rotating plate so as to rotate the wire arm to the first posture side, and the wire arm is a predetermined intermediate between the first posture and the second posture. 2nd posture side than posture In some cases, it is preferable to include a posture stabilizing member that applies elastic force to the rotating plate so as to rotate the wire arm to the second posture side.

  In this configuration, the wire arm to which the lifter wire is connected is always in the first posture (when the normal lifter is used), and therefore the braking mechanism does not operate. However, if the tension | tensile_strength of a lifter wire falls, a wire arm will rotate to a 2nd attitude | position side according to this. Specifically, when the tension of the lifter wire falls within a certain range, the wire arm changes to the second posture side and the rotating plate also rotates with the wire arm. When the tension of the lifter wire is extremely reduced (typically when the lifter wire is cut), the wire arm is in the second position, and as a result, the braking mechanism is activated and the lifting and lowering of the lifter body is restricted. Is done.

  When the tension of the lifter wire falls within a certain range due to the frictional force, the wire arm rotates to the second posture side, but since the posture stabilizing member is provided, the wire arm Without completely changing the posture to two postures, the wire arm is positioned on the first posture side with respect to a predetermined intermediate posture between the first posture and the second posture, and by the elastic force of the posture stabilizing member, It is returned to the first posture again. In other words, the elastic force of the posture stabilizing member pulls the lifter wire. Therefore, the tension of the lifter wire lowered by the friction force is compensated, and the operation of the braking mechanism is prevented. However, when the tension of the lifter wire is extremely decreased, the wire arm is rotated to the second posture side, and the posture is stabilized when the wire arm is further rotated to the second posture side than the predetermined intermediate posture. The member applies an elastic force to the wire arm in order to stabilize the wire arm in the second posture. Therefore, the wire arm instantaneously changes to the second posture, and as a result, the braking mechanism is activated and the braking state is maintained.

  (6) The braking mechanism is connected to the wire arm and presses the upper surface of the ladder when the wire arm assumes the second posture due to the tension of the lifter wire being smaller than a certain value. The lifter main body is separated from the top surface of the ladder when the wire arm is in the first posture due to the lift control posture for controlling the lift of the lifter main body and the tension of the lifter wire exceeding the predetermined value. It is preferable to have a brake cam that changes its posture between an up-and-down allowable posture that allows the up-and-down movement. The braking mechanism preferably includes a connecting rod that connects the rotary plate and the brake cam and changes the posture of the brake cam as the rotary plate rotates.

  In this configuration, the connecting rod links the rotation of the rotating plate and the change in the posture of the brake cam. Therefore, the mechanism for operating the braking mechanism is very simple, and there is an advantage that the braking mechanism can be reliably operated. Moreover, since the brake mechanism has a structure in which the brake cam whose posture changes presses the ladder, the structure of the brake mechanism is also simple. Therefore, there is also an advantage that reliable braking of the lifter body is realized.

  (7) It is preferable that the braking mechanism includes a biasing member that applies a predetermined elastic force to the rotating plate so as to rotate the wire arm to the second posture side. Then, when the wire arm is on the first posture side with respect to the intermediate posture, the rotational force of the wire arm by the biasing member is caused by the posture stabilizing member so as to rotate the wire arm to the first posture side. It is preferable to set it larger than the rotational force of the wire arm.

  By providing the urging member, the wire arm rotated to the second posture side when the tension of the lifter wire falls within a certain range is returned to the first posture again, and the tension of the lifter wire is reduced. When it falls extremely, a wire arm can change to a 2nd attitude | position. Thus, the posture change of the wire arm is easily controlled by the elastic force of the urging member.

  (8) The posture stabilizing member and the urging member are preferably made of a coil spring.

  By adopting a coil spring as the posture stabilizing member and the urging member, there is an advantage that the structure of the posture stabilizing member and the urging member is very simple, and the manufacturing cost of the lifter can be kept low.

  According to the present invention, even if the lifter wire is loosened momentarily, this is corrected, so that a smooth lifter operation can be performed without inadvertently operating the braking mechanism. Further, even when a frictional force is generated between the lifter and the ladder, a smooth lifter operation can be performed without inadvertently operating the braking mechanism. In addition, when the lifter wire is extremely lowered in tension, such as when the lifter wire is cut, the braking mechanism operates reliably, and the lifter is reliably prevented from falling.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

<First Embodiment>

  FIG. 1 is a side view of a fire engine 20 with a telescopic ladder equipped with a lifter according to a first embodiment of the present invention.

  The fire truck 20 with an extendable ladder includes a vehicle main body 21 and an extendable ladder 22 mounted on the vehicle main body 21. The telescopic ladder 22 is provided with a basket 23 at the tip thereof, and the lifter 24 is attached to the upper surface of the telescopic ladder 22. The lifter 24 has a foldable structure. Thus, the lifter 24 is folded as shown in the figure when not in use, and is unfolded as will be described later when in use so that firefighters and the like can board.

  FIG. 2 is a bottom view of the deployed lifter 24, and shows a state where the lifter 24 is engaged with the upper surface 35 of the telescopic ladder 22. FIG. 3 is a side view of the lifter 24, and FIG. 4 is a rear view of the lifter 24.

  As shown in FIG. 1, the vehicle main body 21 includes a chassis 26 having a frame 25, an engine and a drive device and a body mounted on the frame 25, and a boom support device 27 attached to the frame 25 via a subframe 34. And a boom hoisting device 28, and a turning device 29 that is interposed between the subframe 34 and the boom supporting device 27 and turns the boom supporting device 27. The vehicle body 21 has a known configuration. The telescopic ladder 22 is supported by a boom support device 27 via a ladder frame 30. The boom hoisting device 28 is provided with a hoisting cylinder 31, and the ladder frame 30 hoists around the hoisting central axis 32 as the hoisting cylinder 31 expands and contracts. When the stroke of the hoisting cylinder 31 is set to a predetermined dimension, the hoisting angle of the telescopic ladder 22 is set.

  As shown in FIG. 2, the telescopic ladder 22 has a six-stage knitting in this embodiment. That is, the first-stage ladder 101 to the fifth-stage ladder 105 are fitted into the inner sides of the adjacent second-stage ladder 102 to the sixth-stage ladder 106, respectively. Each of the five-stage ladders 105 can slide in the longitudinal direction with respect to the adjacent second-stage ladder 102 to sixth-stage ladder 106. The telescopic ladder 22 is equipped with telescopic devices for sliding the first stage ladder 101 to the fifth stage ladder 105 with respect to the adjacent second stage ladder 102 to the sixth stage ladder 106, respectively. By operating this telescopic device, the telescopic ladder 22 is expanded and contracted in the longitudinal direction. This telescopic device is also a known structure. Furthermore, the basket 23 also has a known structure. The basket 23 is attached to the front end of the telescopic ladder 22 and is used for rescue operations and fire extinguishing activities for victims at the fire site.

  Similar to the basket 23, the lifter 24 is used for rescue operations and fire extinguishing activities for victims at the fire site. Specifically, as shown in FIG. 2, the lifter 24 is attached to the upper surface 35 of the telescopic ladder 22 and can be moved up and down along the telescopic ladder 22. One end of the lifter wire is connected to the lifter 24. The lifter wire is wound around a wire drum 33 (see FIG. 1) provided on the ladder frame 30. That is, the lifter 24 is suspended from the lifter wire, and the lifter wire is wound by rotating the wire drum 33 in a predetermined direction. As a result, the lifter 24 is moved along the telescopic ladder 22. To rise. Further, when the wire drum 33 is rotated in the anti-predetermined direction, the lifter wire is fed out, and as a result, the lifter 24 descends along the telescopic ladder 22. The feature of the present embodiment is the structure of the lifter 24, and the lifter 24 has a structure described later, so that the lifter 24 can be lifted and lowered smoothly to enable a quick rescue operation. is there.

  As shown in FIG. 3, the lifter 24 includes a lifter body 36, a wire arm 37 (wire connection portion) provided on the lifter body 36, a braking mechanism 38, and a wire correction mechanism that corrects slackness of the lifter wire 39. 40.

  The lifter main body 36 has a substantially rectangular parallelepiped frame structure, and the front side (the upper side in the figure) is opened so that firefighters and the like can easily get on and off. The lifter body 36 includes a base member 41, a floor member 42, a pair of handrail members 43, and links 44 to 47 for folding the handrail member 43. The lifter body 36 can be made of carbon steel, for example. The base member 41 is formed in a rectangular flat plate shape, and an attachment frame 48 is provided on the back side thereof. The braking mechanism 38 and the like are attached to the attachment frame 48. The structure of the mounting frame 48 will be described later.

  The floor member 42 is attached below the base member 41 (right end in FIG. 3). The floor member 42 is formed in a rectangular plate shape, and a fire brigade member or the like who rides on the lifter main body 36 mounts his / her foot. The floor member 42 is rotatable about the pin 50. The links 44 to 47 are pipe-like members, and are connected to the base member 41 via pins 50 to 53, respectively. The link 44 is fixed to the floor member 42 and rotates together with the floor member 42 around the pin 50. The lower ends of the links 45 to 47 are rotatable around the pins 51 to 53, respectively. The pair of handrail members 43 are also pipe-shaped members and are arranged on both sides of the base member 41. The upper ends of the links 44 to 47 are connected to the handrail member 43 via pins 54 to 57. Therefore, when the links 44 to 47 rotate around the pins 50 to 57, the handrail member 43, the links 44 to 47, and the floor member 42 are folded with respect to the base member 41 (see FIG. 1). Alternatively, it is expanded as shown in FIG.

  A roller 59 is provided on the back side of the base member 41 via a support pin 58. As shown in FIG. 3, the roller 59 is provided at a substantially central portion and a lower end portion of the lifter main body 36. As shown in FIG. 2, the roller 59 abuts on the upper surface 35 of the telescopic ladder 22 and Can be rolled. That is, when the lifter 24 moves up and down along the telescopic ladder 22, the roller 59 rolls on the upper surface 35, so that the lifter 24 can move up and down smoothly.

  2 to 4, the mounting frame 48 includes main frames 60 and 61, a fixing member 62 for fixing the main frames 60 and 61 to the base member 41, and a cross member for improving the rigidity of the main frames 60 and 61. 63. The mounting frame 48 can be made of carbon steel like the base member 41. As shown in FIGS. 2 and 3, the mounting frame 48 is formed so as to protrude to the back surface side of the base member 41. Therefore, when the lifter 24 is engaged with the telescopic ladder 22, the mounting frame 48 enters the inside of the telescopic ladder 22. Therefore, the braking mechanism 38 and the like attached to the attachment frame 48 are also arranged inside the telescopic ladder 22. Accordingly, the lifter 24 that moves up and down along the telescopic ladder 22 can be designed compactly.

  FIG. 5 is an enlarged view of a main part of FIG. 3, and the structure of the wire arm 37 is shown in detail. 6 is a sectional view taken along line VI-VI in FIG.

  As shown in FIGS. 4 and 5, the wire arm 37 is attached to the main frames 60 and 61. Specifically, the shaft 64 is disposed so as to be bridged between the main frames 60 and 61, and a pair of wire arms 37 are connected to both ends of the shaft 64. Each wire arm 37 is formed in an elongated flat plate shape, and its base end portion 65 is fixed to the shaft 64. Both ends of the shaft 64 are supported by the main frames 60 and 61 so as to be rotatable about the axial direction. Accordingly, each wire arm 37 can be rotated around the shaft 64 around the shaft 64.

  The lifter wire 39 is connected to the tip 66 of each wire arm 37. Specifically, a connection fitting 67 is attached to the tip 66 of each wire arm 37, and the lifter wire 39 is connected to the connection fitting 67 (see FIG. 4). The connection fitting 67 has a known structure, and includes a connection ring 68 locked to the distal end portion 66 of each wire arm 37 and a V-shaped attachment 69 connected to the connection ring 68. The lifter wire 39 is connected to the top of the V-shaped metal fitting 69.

  As shown in FIGS. 5 and 6, a positioning member 70 is attached to the main frames 60 and 61. The positioning member 70 is arranged so as to be bridged between the main frames 60 and 61 (see FIG. 4). In the present embodiment, a pair of fixing plates 72 are provided on the main frames 60 and 61. The fixing plate 72 is disposed so as to cover the corners between the main frames 60 and 61 and the fixing member 62, and both ends of the positioning member 70 are attached to the fixing plate 72. Therefore, the positioning member 70 is securely fixed to the main frames 60 and 61.

  A contact plate 71 is fixed to the positioning member 70. Each wire arm 37 comes into contact with the contact plate 71. More specifically, as described above, the lifter wire 39 is wound around the wire drum 33 (see FIG. 1), and one end of the lifter wire 39 is connected to each wire arm 37. The lifter wire 39 is suspended along the telescopic ladder 22. Since each of the wire arms 37 can rotate around the shaft 64 around the shaft 64, when the lifting force of the lifter 24 acts on the lifter wire 39, the direction of the lifting force (see FIG. Each of the wire arms 37 is rotated clockwise (in FIG. 5). That is, as shown in FIG. 5, each wire arm 37 is positioned in contact with the contact plate 71. The posture of each wire arm 37 at this time is defined as a “first posture”. On the other hand, as will be described in detail later, each wire arm 37 can also rotate counterclockwise in FIG. 5 (the direction opposite to the direction of the suspension force). Thus, the posture of each wire arm 37 when it is rotated to the left is defined as a “second posture”.

  As shown in FIGS. 3 to 5, the braking mechanism 38 includes a brake cam 73, a connecting rod 74, and a coil spring 75 connected to the connecting rod 74.

  As shown in FIG. 3, the brake cam 73 is disposed behind the roller 59 (on the right side in the figure). The brake cam 73 is formed in a substantially fan shape and is supported by a support shaft 76. The support shaft 76 is fixed to the base member 41. Specifically, both end portions of the support shaft 76 are supported by bearing plates 77 provided on the base member 41. The brake cam 73 is turnable around the support shaft 76, and as shown in the figure, the posture is directed in the lateral direction, and the posture is turned downward from the posture in the right direction in the figure. The posture changes with the posture suitable for. The posture in which the brake cam 73 faces in the lateral direction is defined as “elevation allowance posture”, and the posture in which the brake cam 73 faces downward is defined as “elevation restriction posture”.

  The connecting rod 74 is an elongated rod-like member, and connects the wire arm 37 and the brake cam 73 as shown in FIG. Therefore, the brake cam 73 changes its posture in conjunction with the change in posture of the wire arm 37. That is, as shown in FIG. 3, when the wire arm 37 is in the first posture, the brake cam 73 is in a laterally-facing posture (lifting / allowing posture), and conversely, the wire arm 37 is in the first posture. When the posture is changed from the second posture side to the second posture side, the brake cam 73 is rotated to the right and changed to a posture facing downward (elevation restriction posture).

  The coil spring 75 has one end attached to the connecting rod 74 via the bracket 79 and the other end attached to the main frames 60 and 61 via the bracket 78. This coil spring 75 is a so-called tension spring, and in FIG. 3, the connecting rod 74 is always elastically pulled to the left side. That is, the coil spring 75 receives the elastic force so that the wire arm 37 rotates to the second posture side, and the brake cam 73 applies the elastic force so as to be in a downward posture (elevation restriction posture). It will be received. However, when the normal lifter 24 is used, the suspension force acting on the lifter wire 39 is larger than the elastic force of the coil spring 75. Therefore, the wire arm 37 is always in the first posture, and the brake cam 73 It is a posture that is oriented in the direction (elevation allowance posture).

  When the brake cam 73 is in the lateral orientation (elevation allowance posture), the brake cam 73 is separated from the upper surface 35 of the telescopic ladder 22. However, the brake cam 73 presses the upper surface 35 of the telescopic ladder 22 when the brake cam 73 assumes a downward orientation (elevation restriction posture). As described above, when the brake cam 73 is in the laterally oriented posture (elevation allowed posture), the lifter body 36 can be lifted and lowered along the telescopic ladder 22, and the brake cam 73 is directed downward. When it becomes the posture (elevation regulation posture), a predetermined frictional force is generated between the brake cam 73 and the upper surface 35 of the telescopic ladder 22, and the lifter body 36 slides along the telescopic ladder 22 by this frictional force. Can not do.

  The wire correction mechanism 40 corrects the slack of the lifter wire 39 as described above. As shown in FIG. 3, this wire straightening mechanism 40 includes a pulley 80 on which a lifter wire 39 is wound and slidable in the left-right direction in the drawing, and a coil spring that elastically biases the pulley 80 in the right direction in the drawing. 84 (biasing member).

  The pulley 80 is formed in a disk shape, and a groove is formed on the peripheral surface thereof. The lifter wire 39 is fitted in the groove and is wound around the pulley 80. The pulley 80 is supported by a support frame 81 and is rotatable around the center thereof. The support frame 81 includes a slide shaft 82, and the slide shaft 82 is supported by the fixing member 62. Specifically, the slide shaft 82 is slidably supported by a bracket 83 attached to the fixing member 62, and the slide shaft 82 is slidable in the left-right direction in FIGS. .

  The coil spring 84 is disposed between the slide shaft 82 and the bracket 83. Specifically, the fixing nuts 85 and 86 are hung on the slide shaft 82 in a state where the coil spring 84 is fitted into the slide shaft 82. That is, the coil spring 84 is disposed between the end face of the bracket 83 and the fixing nuts 85 and 86, and applies an elastic force so that the slide shaft 82 is always slid rightward in the drawing. In the normal use state of the lifter 24, since the suspension force is applied to the lifter wire 39 as described above, the suspension force causes the coil spring 84 to be completely contracted, and the pulley 80 moves to the left side in the drawing. It is energized.

  FIG. 7 is a side view of the main part of the lifter 24, and shows a state where the wire straightening mechanism 40 is activated. In the figure, a part of the connecting rod 74 is not shown.

  While the lifter 24 is in use, the lifter wire 39 may be loosened due to the causes described below. However, in the present embodiment, as shown in FIG. 7, even when the lifter wire 39 is momentarily loosened, the coil spring 84 extends and the pulley 80 slides to the right in the drawing, and this lifter wire 39 slack is corrected. As a result, the tension generated in the lifter wire 39 is maintained above a certain value.

  As shown in FIGS. 1 and 2, the lifter 24 according to the present embodiment is attached to a telescopic ladder 22 mounted on the fire engine 20. In the fire scene, the telescopic ladder 22 is raised at a predetermined angle and expanded and contracted to a predetermined length. The lifter body 36 is raised and lowered along the upper surface 35 of the telescopic ladder 22. As described above, generally, during the operation of the lifter 24, the lifting force of the lifter body 36 acts on the lifter wire 39. Therefore, as shown in FIG. Yes. For this reason, the braking mechanism 38 is displaced to the allowable lifting position. In other words, the brake cam 73 is in the elevation allowing posture, and the lifter 24 can freely move up and down along the telescopic ladder 22.

  In this state, if the tension of the lifter wire 39 becomes extremely smaller than a certain value during the operation of the lifter 24, for example, if the lifter wire 39 is cut, the brake cam 73 is in the elevation restriction posture. As a result, the brake cam 73 presses the upper surface 35 of the telescopic ladder 22 and the lifting and lowering of the lifter body 36 is restricted. That is, the lifter 24 is prevented from falling.

  By the way, since the situation of a fire field is various, it is anticipated that the expansion-contraction ladder 22 will be used with various standing angles (however, within the usable standing range) and extension length. And when the expansion-contraction ladder 22 is made into the multistage knitting like this embodiment, there exists a possibility that a level | step difference may arise between adjacent ladders. Therefore, when the lifter 24 slides on the upper surface 35 of the telescopic ladder 22 and passes through the step, the slide of the lifter body 36 may be instantaneously decelerated. In such a case, the suspension force of the lifter body 36 acting on the lifter wire 39 may be reduced, or the lifter wire 39 may be loosened momentarily. Further, the lifter 24 that is being lifted may be suddenly lowered, and in this case, the lifter wire 39 may be bent instantaneously. However, even if the lifter wire 39 is loosened momentarily, the loosening of the lifter wire 39 is corrected by operating the wire correction mechanism 40 as described above, and the operation of the braking mechanism 38 is avoided. Therefore, even if the lifter 24 that slides along the telescopic ladder 22 is instantaneously decelerated or stopped, the braking mechanism 38 does not operate, and the lifter 24 can be operated smoothly.

  In particular, in this embodiment, the lifter wire 39 is wound around the pulley 80, and the pulley 80 is urged by the coil spring 84 in a direction in which the slack of the lifter wire 39 is absorbed. Therefore, even if the lifter wire 39 is loosened momentarily, the slack of the lifter wire 39 is immediately absorbed by the pulley 80 sliding. That is, the mechanism for correcting the slack of the lifter wire 39 is very simple and reliable. In addition, since the coil spring 84 is employed to slide the pulley 80, the structure of the means for absorbing the slack of the lifter wire 39 is very simple, and the manufacturing cost of the lifter 24 can be kept low. There is.

  Further, in the present embodiment, the connecting rod 74 interlocks the posture change of the wire arm 37 and the brake cam 73. Therefore, the mechanism for operating the braking mechanism 38 is very simple, and there is an advantage that the braking mechanism 38 is reliably operated. In addition, since the brake mechanism 38 has a structure in which the brake cam 73 whose posture changes presses the upper surface 35 of the telescopic ladder 22, the structure of the brake mechanism 38 is also simple. Therefore, there is an advantage that reliable braking of the lifter body 36 is realized.

<Second Embodiment>

  Next, a second embodiment of the present invention will be described.

  FIG. 8 is a side view of the main part of the lifter according to the second embodiment of the present invention. FIG. 9 is a side view of an essential part of the lifter, and shows a state where a braking mechanism provided in the lifter is operated.

  Similarly to the lifter 24 according to the first embodiment, the lifter 90 according to the present embodiment is attached to the upper surface 35 of the telescopic ladder 22 and used for rescue operations and fire extinguishing activities for disaster victims at the fire site. The difference between the lifter 90 and the lifter 24 according to the first embodiment is that, in the first embodiment, the wire straightening mechanism 40 for correcting the momentary slack of the lifter wire 39 is provided. In this embodiment, a tension compensation mechanism 110 that compensates the tension of the lifter wire 39 is provided. By providing this tension compensation mechanism 110, even if the tension of the lifter wire 39 falls within a certain range, the tension of the lifter wire 39 is ensured above a certain level. Note that, in the lifter 90 according to the present embodiment, the same reference numerals as those of the lifter 24 are assigned to the same configurations as those of the lifter 24 according to the first embodiment.

  As shown in FIG. 8, the lifter 90 includes a lifter main body 36, a wire arm 37 (wire connecting portion) provided on the lifter main body 36, a braking mechanism 38, and a tension compensation mechanism that compensates for the tension of the lifter wire 39. 110.

  The lifter 90 includes a lifter main body 36 in the same manner as the lifter 24 according to the first embodiment. That is, as shown in FIG. 3, the lifter main body 36 has a substantially rectangular parallelepiped frame structure, and the front side (the upper side in the figure) is opened so that firefighters and the like can easily get on and off. The lifter body 36 includes a base member 41, a floor member 42, a pair of handrail members 43, and links 44 to 47 for folding the handrail member 43. The lifter body 36 can be made of carbon steel, for example. The base member 41 is formed in a rectangular flat plate shape, and an attachment frame 48 is provided on the back side thereof. The braking mechanism 38 and the like are attached to the attachment frame 48.

  The floor member 42 is attached below the base member 41 (right end in FIG. 3). The floor member 42 is formed in a rectangular plate shape, and a fire brigade member or the like who rides on the lifter main body 36 mounts his / her foot. The floor member 42 is rotatable about the pin 50. The links 44 to 47 are pipe-like members, and are connected to the base member 41 via pins 50 to 53, respectively. The link 44 is fixed to the floor member 42 and rotates together with the floor member 42 around the pin 50. The lower ends of the links 45 to 47 are rotatable around the pins 51 to 53, respectively. The pair of handrail members 43 are also pipe-shaped members and are arranged on both sides of the base member 41. The upper ends of the links 44 to 47 are connected to the handrail member 43 via pins 54 to 57. Therefore, when the links 44 to 47 rotate around the pins 50 to 57, the handrail member 43, the links 44 to 47, and the floor member 42 are folded with respect to the base member 41 (see FIG. 1). Alternatively, it is expanded as shown in FIG.

  A roller 59 is provided on the back side of the base member 41 via a support pin 58. As shown in FIG. 3, the roller 59 is provided at a substantially central portion and a lower end portion of the lifter main body 36. As shown in FIG. 2, the roller 59 abuts on the upper surface 35 of the telescopic ladder 22 and Can be rolled. That is, when the lifter 24 moves up and down along the telescopic ladder 22, the roller 59 rolls on the upper surface 35, so that the lifter 24 can move up and down smoothly.

  As shown in FIGS. 8 and 2 to 4, the mounting frame 48 improves the rigidity of the main frames 60 and 61, the fixing member 62 that fixes the main frames 60 and 61 to the base member 41, and the main frames 60 and 61. The cross member 63 is provided. The mounting frame 48 can be made of carbon steel like the base member 41. As shown in FIG. 8, the attachment frame 48 is formed so as to protrude to the back surface side of the base member 41. Therefore, when the lifter 24 is engaged with the telescopic ladder 22, the mounting frame 48 enters the inside of the telescopic ladder 22. Therefore, the braking mechanism 38 and the like attached to the attachment frame 48 are also arranged inside the telescopic ladder 22. Accordingly, the lifter 24 that moves up and down along the telescopic ladder 22 can be designed compactly.

  The wire arm 37 is attached to the main frames 60 and 61. Specifically, the shaft 64 (rotation center shaft) is disposed so as to be bridged between the main frames 60 and 61, and a pair of wire arms 37 are connected to both ends of the shaft 64. Each wire arm 37 is formed in an elongated flat plate shape, and its base end portion 65 is fixed to the shaft 64. Both ends of the shaft 64 are supported by the main frames 60 and 61 so as to be rotatable about the axial direction. Accordingly, each wire arm 37 can be rotated around the shaft 64 around the shaft 64.

  The lifter wire 39 is connected to the tip 66 of each wire arm 37. Specifically, a connection fitting 67 is attached to the tip 66 of each wire arm 37, and the lifter wire 39 is connected to the connection fitting 67. The connection fitting 67 has a known structure, and includes a connection ring 68 locked to the distal end portion 66 of each wire arm 37 and a V-shaped attachment 69 connected to the connection ring 68. The lifter wire 39 is connected to the top of the V-shaped metal fitting 69.

  As disclosed in the first embodiment, the lifter wire 39 is wound around the wire drum 33 (see FIG. 1) and one end thereof is connected to the wire arms 37. 90 is suspended by the lifter wire 39 along the telescopic ladder 22. Since each of the wire arms 37 can rotate around the shaft 64 around the shaft 64, when the lifting force of the lifter 24 acts on the lifter wire 39, the direction of the lifting force (see FIG. Each of the wire arms 37 rotates clockwise (in FIG. 8). The posture of each wire arm 37 at this time is defined as a “first posture”. On the other hand, as will be described in detail later, each wire arm 37 can be rotated counterclockwise in FIG. 8 (the direction opposite to the direction of the suspension force). Thus, the posture of each wire arm 37 when it is rotated to the left is defined as a “second posture”.

  The braking mechanism 38 includes a brake cam 73, a connecting rod 74, and a coil spring 75 connected to the connecting rod 74.

  As shown in FIG. 8, the brake cam 73 is disposed behind the roller 59 (on the right side in the figure). The brake cam 73 is formed in a substantially fan shape and is supported by a support shaft 76. The support shaft 76 is fixed to the base member 41. Specifically, both end portions of the support shaft 76 are supported by bearing plates 77 provided on the base member 41. The brake cam 73 is turnable around the support shaft 76, and as shown in the figure, the posture is directed in the lateral direction, and the posture is turned downward from the posture in the right direction in the figure. The posture is changed between the posture (refer to FIG. 9) that is suitable for the head. As in the first embodiment, the posture in which the brake cam 73 faces in the lateral direction is defined as “elevation allowance posture”, and the orientation in which the brake cam 73 faces downward is defined as the “elevation restriction posture”.

  The connecting rod 74 is an elongated rod-like member, and connects the wire arm 37 and the brake cam 73 as shown in FIG. Therefore, the brake cam 73 changes its posture in conjunction with the change in posture of the wire arm 37. That is, when the wire arm 37 is in the first posture, the brake cam 73 is in a lifting / lowering allowable posture, and conversely, when the wire arm 37 is changed from the first posture to the second posture side, the brake cam 73 Reference numeral 73 is configured to turn rightward and change into an elevation restriction posture.

  The coil spring 75 has one end attached to the connecting rod 74 via the bracket 79 and the other end attached to the main frames 60 and 61 via the bracket 78. The coil spring 75 is a so-called tension spring, and in the same figure, the connecting rod 74 is always elastically pulled leftward. That is, the coil arm 75 receives the elastic force so that the wire arm 37 rotates to the second posture side, and the brake cam 73 receives the elastic force so as to be in the elevation restriction posture. However, when the normal lifter 24 is used, the suspension force acting on the lifter wire 39 is larger than the elastic force of the coil spring 75. Therefore, the wire arm 37 is always in the first posture, and the brake cam 73 is moved up and down. It is an allowable posture.

  When the brake cam 73 is in the elevation permitting posture, the brake cam 73 is separated from the upper surface 35 of the telescopic ladder 22. However, when the brake cam 73 is in the elevation restriction posture, the brake cam 73 presses the upper surface 35 of the telescopic ladder 22. As described above, when the brake cam 73 is in the elevation allowance posture, the lifter body 36 can be raised and lowered along the telescopic ladder 22, and when the brake cam 73 is in the elevation restriction posture, the brake cam 73 is lifted. A predetermined frictional force is generated between the lifter body 22 and the upper surface 35 of the telescopic ladder 22, and the lifter body 36 cannot slide along the telescopic ladder 22 due to this frictional force.

  The tension compensation mechanism 110 includes a rotating plate 92 attached to the shaft 64 and a coil spring 94 (posture stabilizing member) connected to the rotating plate 92 via an intermediate connecting member 93.

  The rotating plate 92 is formed in a triangular shape. The rotating plate 92 is connected to the wire arm 37 and rotates with the wire arm 37 about the shaft 64. Therefore, the rotating plate 92 rotates around the shaft 64 following the change in the posture of the wire arm 37. The connecting rod 74 is connected to the first top portion 95 of the rotating plate 92, and therefore, the wire arm 37 and the brake cam 73 are connected via the rotating plate 92 as described above. In the present embodiment, the rotating plate 92 is configured as a member different from the wire arm 37, but it goes without saying that both may be formed integrally.

  The intermediate connecting member 93 is connected to the second top portion 96 of the rotating plate 92. The intermediate connecting member 93 is formed in a U shape as shown in FIG. One end of the intermediate connecting member 93 is connected to the second top 96 of the rotating plate 92, and the coil spring 94 is connected to the other end. The reason why the intermediate connecting member 93 is formed in a U-shape is to avoid interference with the shaft 64. Therefore, the shape of the intermediate connecting member 93 is not limited to the U-shape, and can be appropriately changed. Further, the intermediate connecting member 93 may be omitted, and the coil spring 94 may be directly connected to the second top portion 96. In short, the shape of the intermediate connecting member 93 may be determined so that the elastic force of the coil spring 94 acts on the second top portion 96, and the intermediate connecting member 93 is omitted, and the coil spring 94 is directly connected to the second spring 96. It may be connected to the top 96.

  The coil spring 94 is disposed between the other end of the intermediate connecting member 93 and the base member 41. Specifically, the coil spring 94 is fixed to a bracket 97 attached to the base member 41. For this reason, the coil spring 94 provides an elastic force so that the intermediate connecting member 93 is always pulled to the right in the drawing. However, as described above, in the normal use state of the lifter 90, the suspension force acts on the lifter wire 39, so that the suspension arm 92 is brought into the first posture by the suspension force, and the rotating plate 92. Rotates to the right. Therefore, the brake cam 73 is in the elevation allowance posture, and the lifter 90 can be raised and lowered along the telescopic ladder 22. In addition, in this embodiment, in this state, the intermediate coupling member 93 is pulled to the right side (see FIG. 8) by the coil spring 94. Therefore, the rotating plate 92 receives an elastic force so as to further rotate in the right direction. As a result, the wire arm 37 is stably in the first posture, and the brake cam 73 is stably in the elevation allowance posture.

  FIG. 10 is an enlarged view of a main part of the tension compensation mechanism 110, and illustrates a manner in which the tension of the lifter wire 39 is compensated.

  During use of the lifter 90, the suspension force acting on the lifter wire 39 may be reduced. In this case, the tension of the lifter wire 39 is reduced, and the braking mechanism 38 operates even if the lifter wire 39 is not cut, and the smooth lifting and lowering of the lifter 90 may be hindered. The reason why the tension of the lifter wire 39 is lowered despite the fact that the lifter wire 39 is not cut as described above is typically a frictional force generated between the lifter body 36 and the telescopic ladder 22. More specifically, as shown in FIG. 2, the lifter 24 is placed on the upper surface 35 of each of the first-stage ladder 101 to the sixth-stage ladder 106. In this state, the roller 59 rolls on the upper surface 35 of the telescopic ladder 22. At this time, the side surface of the telescopic ladder 22 and the clamping member 111 of the lifter main body 36 are in sliding contact to generate the frictional force. . In particular, when the friction force is generated while the lifter 90 is lowered, the suspension force is reduced by an amount corresponding to the friction force, and the tension of the lifter wire 39 is reduced.

  Similar to the first embodiment, the lifter 90 according to this embodiment is attached to the telescopic ladder 22 mounted on the fire engine 20 as shown in FIGS. 1 and 2. In the fire site, the telescopic ladder 22 is raised at a predetermined angle within the usable standing range and extended to a predetermined length. The lifter body 36 is raised and lowered along the upper surface 35 of the telescopic ladder 22. In general, during the operation of the lifter 90, the lifting force of the lifter body 36 acts on the lifter wire 39, so that a tension of a certain value or more is generated in the lifter wire 39 as shown in FIG. 8. For this reason, the brake cam 73 becomes a raising / lowering allowable attitude | position, and the lifter 90 can raise / lower freely along the expansion-contraction ladder 22 freely.

  In this state, if the tension of the lifter wire 39 becomes smaller than a certain value during the operation of the lifter 90, such as the lifter wire 39 is cut, the connecting rod 74 is moved to the left side by the elastic force of the coil spring 75 ( 8), and the intermediate connecting member 93 is pulled rightward by the elastic force of the coil spring 94. In other words, the rotating plate 92 is pulled by the coil spring 75 so as to rotate leftward, and at the same time, the rotating plate 92 is pulled by the coil spring 94 so as to rotate rightward. In the present embodiment, the moment about the shaft 64 due to the elastic force of the coil spring 75 is set to be larger than the moment about the shaft 64 due to the elastic force of the coil spring 94. Therefore, the rotating plate 92 rotates counterclockwise against the elastic force of the coil spring 94, whereby the brake cam 73 changes to the elevation restriction posture.

  The postures of the rotating plate 92, the intermediate connecting member 93, and the coil spring 94 at this time are indicated by two-dot chain lines in FIG. As shown in the figure, when the rotating plate 92 rotates about the shaft 64, the second top 96 of the rotating plate 92 moves on an arc centered on the shaft 64 and the end of the coil spring 92. It passes through an imaginary line IL connecting 98 and the axis 64. When the second top 96 is positioned above the imaginary line IL (see FIG. 10), the elastic force of the coil spring 94 acts to rotate the rotating plate 92 clockwise, but the second top 96 Is located below the imaginary line IL, the elastic force of the coil spring 94 acts to rotate the rotating plate 92 counterclockwise. That is, a toggle mechanism is configured by the rotating plate 92.

  Therefore, when the tension of the lifter wire 39 becomes smaller than a certain value, such as when the lifter wire 39 is cut while the lifter 90 is in operation, the rotating plate 92 rotates to the left and the brake cam 73 moves up and down. Since the elastic force of the coil spring 94 acts to further rotate the rotating plate 92 in the left direction, the brake cam 73 is stably maintained in the ascending / descending regulation posture. That is, the brake cam 73 presses the upper surface 35 of the telescopic ladder 22 and the lifting and lowering of the lifter body 36 is surely restricted, and the lifter 90 is reliably prevented from falling.

  By the way, in the use of the lifter 90 at the fire site, as described above, the suspension force of the lifter main body 36 acting on the lifter wire 39 may be reduced, and the tension generated in the lifter wire 39 may be reduced. In this case, the posture of the wire arm 37 may change to the second posture side, and the brake cam 73 may be actuated to restrict the lifting and lowering of the lifter body 36. However, even when the tension generated in the lifter wire 39 is lowered, the tension of the lifter wire 39 is compensated in the following manner, and the tension is maintained at a certain value or more.

  When the tension of the lifter wire 39 falls within a predetermined range, the wire arm 37 rotates leftward from the first posture shown in FIG. 8 and tries to change its posture to the second posture side. That is, the rotating plate 92 rotates leftward. At this time, since the coil spring 94 is extended, the elastic force of the coil spring 94 is increased, and the elastic force acts to rotate the rotating plate 92 in the right direction. That is, the elastic force of the coil spring 94 compensates for a decrease in the tension of the lifter wire 39 and suppresses the wire arm 37 from changing to the second posture.

  More specifically, as shown in FIG. 10, when the tension of the lifter wire 39 falls within a certain range, the rotating plate 92 rotates to the left and the wire arm 37 also rotates in the same direction. . The “certain range” is a range in which the second top portion 96 of the rotating plate 92 is displaced leftward in the figure, but is located above the imaginary line IL. The posture of the wire arm 37 when the second top portion 96 is on the virtual line IL is defined as an “intermediate posture” between the first posture and the second posture.

  Since the rotary plate 92 constitutes the toggle mechanism, when the decrease in the tension of the lifter wire 39 is within a certain range and the wire arm 37 is on the first posture side with respect to the intermediate posture, the wire arm 37 remains stationary on the first posture side of the intermediate position without completely changing to the second posture. At this time, the rotating plate 92 stops at a portion where the balance between the elastic force of the coil spring 75 and the resultant force of the coil spring 94 and the tension of the lifter wire 39 is balanced. Thereafter, when the tension of the lifter wire 39 is increased again, the rotating plate 92 rotates in the right direction.

  Thus, even when the suspension force of the lifter main body 36 changes and the tension of the lifter wire 39 fluctuates, the rotation of the rotating plate 92 in the left direction is suppressed, and as a result, the brake cam 73 moves up and down. The allowable posture is maintained. Therefore, even if a frictional force is generated between the lifter body 36 and the telescopic ladder 22 during use of the lifter 90, the operation of the braking mechanism 38 is suppressed, and the lifter 90 can be operated smoothly. On the other hand, when the tension of the lifter wire 39 is extremely reduced, the wire arm 37 is displaced from the intermediate posture to the second posture side as described above, and the braking mechanism 38 operates reliably and stably. Will do.

  In particular, in the present embodiment, the connecting rod 74 links the rotation of the rotating plate 92 and the posture change of the brake cam 73. Therefore, the mechanism for operating the braking mechanism 38 is very simple, and there is an advantage that the braking mechanism 38 can be reliably operated. Moreover, since the brake mechanism 38 has a structure in which the brake cam 73 whose posture changes presses the upper surface 35 of the telescopic ladder 22, the structure of the brake mechanism 38 is also simple. Therefore, there is an advantage that reliable braking of the lifter body 36 is realized.

  Further, when the tension of the lifter wire 39 falls within a certain range, even if the wire arm 37 rotates to the second posture side, it is returned to the first posture again, and the tension of the lifter wire 39 is extremely lowered. In this case, the wire arm 37 is completely changed to the second posture. Such rotation of the wire arm 37 is controlled by the coil spring 75. That is, there is an advantage that the posture change of the wire arm 37 is easily and accurately controlled by the coil spring 75 at a low cost.

  The present invention can be applied to a lifter mounted on a telescopic ladder.

FIG. 1 is a side view of a fire engine with a telescopic ladder equipped with a lifter according to a first embodiment of the present invention. FIG. 2 is a bottom view of the lifter according to the first embodiment of the present invention. FIG. 3 is a side view of the lifter according to the first embodiment of the present invention. FIG. 4 is a rear view of the lifter according to the first embodiment of the present invention. FIG. 5 is an enlarged view of a main part of FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a side view of the main part of the lifter according to the first embodiment of the present invention. FIG. 8 is a side view of the main part of the lifter according to the second embodiment of the present invention. FIG. 9 is a side view of the main part of the lifter according to the second embodiment of the present invention, showing a state where the braking mechanism is activated. FIG. 10 is an enlarged view of a main part of a tension compensation mechanism for a lifter according to the second embodiment of the present invention. FIG. 11 is a side view of a conventional fire engine with a ladder. FIG. 12 is a front view of a conventional lifter. FIG. 13 is a side view of a conventional lifter. FIG. 14 is a bottom view of a conventional lifter.

Explanation of symbols

22 ... Telescopic ladder 24 ... Lifter 35 ... Upper surface of telescopic ladder 36 ... Lifter body 37 ... Wire arm 38 ... Braking mechanism 39 ... Lifter wire 40 ... Tension adjusting mechanism 41 ... Base member 42 ... Floor member 43 ... Handrail member 44-47 ... Link 48 ... Mounting frame 50-57 ... Pin 58 ... Support pin 59 ... Roller 60 ... Main frame 61 ... Main frame 62 ... Fixing member 63 ... Cross member 64 ... Shaft 65 ... Wire arm proximal end 66 ... Wire arm distal end 67 ... Connection metal 68 ... Connection ring 69 ... V-shaped metal fitting 70 ... Positioning member 71 ... Contact plate 72 ... Fixing plate 73 ... Brake cam 74 ... Connecting rod 75 ...・ Coil spring 76 Holding shaft 77 ... Bearing plate 80 ... Pulley 81 ... Support frame 82 ... Slide shaft 84 ... Coil spring 85 ... Fixed nut 86 ... Fixed nut 90 ... Lifter 91 ... Brake mechanism 92 ... Rotating plate 93 ... Intermediate connecting member 94 ... Coil spring 95 ... First top 96 ... Second top 101 ... First stage ladder 102 ... Second stage Ladder 103: Third stage ladder 104: Fourth stage ladder 105: Fifth stage ladder 106: Sixth stage ladder 110: Tension compensation mechanism

Claims (8)

A lifter body that engages with the upper surface of the ladder mounted on the fire engine and is raised and lowered along the upper surface of the ladder,
A wire connection portion provided on the lifter body, to which a lifter wire that is lifted and lowered along the top surface of the ladder in a state where the lifter body is suspended;
When the tension of the lifter wire is connected to the wire connecting part and the lifter wire tension is above a certain value, the lifter body is allowed to move up and down away from the top surface of the ladder, and when the lifter wire tension becomes smaller than the above certain value, the ladder A braking mechanism that regulates the lifting and lowering of the lifter body by pressing the upper surface of
A lifter provided in a lifter main body and provided with a wire correction mechanism for correcting looseness of a lifter wire within a predetermined range so that the braking mechanism does not operate. The wire straightening mechanism
A pulley around which the lifter wire is wound;
The lifter according to claim 1, further comprising a biasing member that biases the pulley in a direction in which the slack of the lifter wire is absorbed.   The lifter according to claim 2, wherein the biasing member is a coil spring. A lifter body that engages with the upper surface of the ladder mounted on the fire engine and is raised and lowered along the upper surface of the ladder,
A wire connection portion provided on the lifter body, to which a lifter wire that is lifted and lowered along the top surface of the ladder in a state where the lifter body is suspended;
When the tension of the lifter wire is connected to the wire connecting part and the lifter wire tension is above a certain value, the lifter body is allowed to move up and down away from the top surface of the ladder, and when the lifter wire tension becomes smaller than the above certain value, the ladder A braking mechanism that regulates the lifting and lowering of the lifter body by pressing the upper surface of
A lifter provided in a lifter body, and provided with a tension compensation mechanism that compensates for the tension of the lifter wire so that the braking mechanism is not operated by a frictional force generated between the ladder and the lifter body. The wire connection part
The base end portion is connected to a predetermined rotation center shaft provided on the lifter body, and the lifter wire is connected to the distal end portion, and the lifter body rotates around the rotation center shaft in the direction of the lifting force of the lifter body. A wire arm swingable between the first posture and the second posture rotated in the direction opposite to the direction of the suspension force,
The tension compensation mechanism is
A rotating plate that rotates about the rotation center axis together with the wire arm;
When the wire arm is connected to a predetermined position of the rotating plate and the wire arm is on the first posture side with respect to a predetermined intermediate posture between the first posture and the second posture, the wire arm is rotated to the first posture side. When an elastic force is applied to the rotating plate so that the wire arm is on the second posture side relative to a predetermined intermediate posture between the first posture and the second posture, the wire arm is moved to the second posture side. The lifter according to claim 4, further comprising a posture stabilizing member that applies an elastic force to the rotating plate so as to be rotated. The braking mechanism is
When the wire arm is in the second posture due to the tension of the lifter wire being smaller than a predetermined value, the lifter body is restrained from rising and lowering by pressing the upper surface of the ladder. Elevation control posture that allows lifting and lowering of the lifter body away from the top surface of the ladder when the wire arm is in the first posture due to the lift regulation posture and the lifter wire tension being equal to or higher than the predetermined value. And a connecting rod that connects the rotating plate and the brake cam and changes the posture of the brake cam as the rotating plate rotates. Lifter. The braking mechanism includes a biasing member that applies a predetermined elastic force to the rotating plate to rotate the wire arm to the second posture side,
When the wire arm is on the first posture side with respect to the intermediate posture, the rotational force of the wire arm by the biasing member is rotated by the posture stabilizing member so that the wire arm is rotated to the first posture side. The lifter according to any one of claims 4 to 6, wherein the lifter is set to be larger than the rotational force. The lifter according to claim 7, wherein the posture stabilizing member and the biasing member are coil springs.

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