JP2013001138A - Caster stopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caster stopper performing a sure operation, with good operability in a simple structure.SOLUTION: A stopper member lock means 51 includes a sliding type lock plate 52 which is slidably mounted on a lifting platform side, being freely movable between a first position protruding to a stopper arranging recess 5 and a second position which does not protrudes. While a stopper member 11 is present in the stopper arranging recess 5, when the sliding type lock plate 52 is at the first position, the sliding type lock plate 52 engages with the stopper member 11 so that the stopper member 11 is engaged into a stored state in the stopper arranging recess 5, meanwhile, when the sliding type lock plate 52 is at the second position, the stopper member 11 is not engaged.

Description

  The present invention relates to a caster stopper, and more particularly to a caster stopper installed on a lifting platform of a cargo handling work machine mounted on a rear portion of a truck.

  In recent years, loading and unloading work machines have been installed at the rear of cargo trucks in order to save labor and speed up cargo handling work during collection and delivery by trucks. This type of cargo handling machine has a structure in which a lifting platform (usually also serving as the rear gate plate of the vehicle body) can be raised and lowered from the landing position to the height of the vehicle loading platform by a link mechanism or the like. I am trying to load and unload.

  By the way, in the case of the above-described cargo handling work machine, the tip of the lifting platform is lowered in the landing state and is inclined with respect to the horizontal plane. Therefore, when the caster is placed on the lifting platform, the tip of the lifting platform is raised and becomes a horizontal state. This causes a disadvantage that the caster must be held so as not to move.

  For this reason, it has been conventionally proposed to provide a caster stopper on the lifting platform for the purpose of stopping the caster on the lifting platform. However, conventional caster stoppers have a complicated structure and a large number of parts, and there are problems in reliability of operation and operability.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a caster stopper having a simple structure, reliable operation and good operability.

One embodiment of the present invention is a caster stopper. This caster stopper
A stopper placement recess located on the upper surface side of the tip of the lifting platform;
A pivot support recess located on the top side of the lift platform and on the tip side of the stopper placement recess;
A stopper member that is supported by the pivot support recess and is stored in the stopper placement recess or protrudes upward from the stopper placement recess;
A spring member that urges the stopper member in a direction protruding upward from the stopper disposing recess;
Stopper member locking means for holding the stopper member in a state of being stored in the stopper arrangement recess,
The stopper member includes a pivot portion rotatably supported by the pivot recess within a predetermined angle range, and extends from the pivot portion and is stored in the stopper placement recess. An upper surface portion that closes the opening, and a side surface portion that extends downward from the distal end side of the upper surface portion,
The stopper member locking means is slidably attached to the elevating platform side and has a lock plate movable between a first position protruding with respect to the stopper positioning recess and a second position not protruding. And
When the lock plate is in the first position when the stopper member is in the stopper placement recess, the lock plate and the stopper member are engaged with each other so that the stopper member is placed in the stopper placement recess. The stopper member is not locked when the lock plate is in the second position while being locked in the retracted state.

  In the caster stopper of the above aspect, the lock plate may be held at the first position or the second position by a ball click mechanism.

  According to the caster stopper according to the present invention, it is possible to simplify the structure, reduce the number of parts, improve the reliability of operation, and improve operability. Further, for example, it may be provided in the vicinity of the end portion of the stopper disposition recess of the platform, and there is an advantage that it is easy to assemble without taking up space and requiring complicated processing on the platform. Therefore, if the present invention is applied to a cargo handling machine equipped with a lifting platform, the effect of improving the cargo handling work using a cart with casters is extremely large.

The front sectional view in the lock release state of the caster stopper concerning a 1st embodiment of the present invention. It is a block diagram of the stopper member locking means 51 of FIG. 1 in the lock release state of the caster stopper, (A) is a plan view, (B) is a front sectional view, and (C) is a side sectional view. (A) is a plan view of the stopper member locking means 51 in the lock effective state, and (B) is a front sectional view of the caster stopper in the lock effective state. It is the caster stopper which concerns on the 2nd Embodiment of this invention, Comprising: (A) is a top view, (B) is a front sectional view, (C) is a sectional side view. The front sectional view which shows the whole structure of the cargo handling work machine which provided the caster stopper in the raising / lowering platform.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  1 to 3 show a caster stopper according to a first embodiment of the present invention, and FIG. 5 shows an overall structure of a cargo handling work machine in which the caster stopper is provided on a lifting platform. Hereinafter, the overall configuration of the cargo handling machine will be described with reference to FIG. 5, and then the configuration of the caster stopper will be described in detail with reference to FIGS.

  As shown in FIG. 5, the lifting platform 1 of the cargo handling machine has a structure in which a plurality of aluminum alloy extrusion mold materials are joined together, and a plurality of intermediate mold materials 2 that are aluminum alloy extrusion mold materials, It has a tip part mold material 3 connected to the front side and a rear end part mold material 4 connected to the rear side of the intermediate part mold material 2, and is configured so that the upper surface is a substantially rectangular plane as a whole. is there. The caster stopper 10 is provided on the tip part mold material 3 which is an aluminum alloy extrusion mold material on the tip side of the lifting platform 1. The top die 3 has a gently sloping upper surface so that it gradually becomes lower toward the tip of the lifting platform 1 (see also FIG. 1).

  As shown in FIGS. 1 to 3, the caster stopper 10 includes a stopper disposition recess 5, a pivot support recess 7, a stopper member 11, a spring member 21, and a stopper member locking means 51.

  The rectangular stopper disposing recess 5 and the pivot supporting recess 7 having a substantially circular cross section are formed on the upper surface of the tip portion mold member 3 in parallel to the leading edge (in the platform width direction). The formation position of the pivot recess 7 is closer to the tip than the stopper placement recess 5 and in the vicinity of the stopper placement recess 5. A wear-resistant metal component 6 is fitted and fixed to the inner periphery of the pivot recess 7. The pivot recess 7 and the metal part 6 are a part of one of the hinges for rotatably attaching the stopper member 11 to the tip part mold material 3.

  The stopper member 11 is an aluminum alloy extrusion mold member in which the pivot portion 12, the upper surface portion 13, and the side surface portion 14 are integrated, and is cut in accordance with the length dimension of the stopper disposing recessed portion 5 in the platform width direction. It has been processed.

  The pivot portion 12 is a portion that constitutes the other of the hinges for rotatably attaching the stopper member 11 to the tip portion mold material 3, and is rotatably supported by the pivot recess 7 within a predetermined angle range. Specifically, the pivot portion 12 has a substantially circular cross section, and is rotatably fitted to the inner periphery of the wear-resistant metal component 6 disposed in the pivot recess 7. Thereby, rotation of the stopper member 11 is performed smoothly.

  The upper surface portion 13 extends from the pivot portion 12 and closes the opening of the stopper disposing recess 5 when the stopper member 11 is stored in the stopper disposing recess 5 (when the caster stopper 10 is not used) (specifically, (The upper surface 13a of the upper surface portion 13 closes the opening of the stopper disposing recess 5 and forms a substantially flat surface connected to the upper surface of the tip portion mold member 3). At the connecting portion between the upper surface portion 13 and the pivot portion 12, a rotation stop surface 16 at the time of standing is formed so as to rise from the peripheral surface of the pivot portion 12 at an outer corner portion continuous with the upper surface 13 a. The standing-up rotation stop surface 16 restricts the rotation angle of the stopper member 11 when it stands up. When the stopper member 11 is erected, the rotation stop surface 16 at the time of erection comes into contact with the rotation restricting surface 6a of the metal part 6 on the opening tip side of the pivotal support recess 7 and stops. The standing-up rotation stop surface 16 is set so that the maximum angle when the stopper member 11 is raised is, for example, within about 45 °.

  The side surface portion 14 extends downward from the distal end side of the upper surface portion 13, and has a caster stopper surface 18 that forms an acute angle (less than 90 °) with respect to the upper surface 13a. A fitting groove 19 having a substantially circular cross section in the platform width direction is formed at the lower end of the side surface portion 14, and a cushioning material 20 such as rubber is fitted into the fitting groove 19. A part of the cushioning material 20 slightly protrudes from the lower end of the side part.

  The side surface 31 on the rear end side of the stopper disposing recess 5 is an inclined surface set so as to extend substantially in parallel with the caster stopper surface 18 when the stopper member 11 is stored, that is, toward the opening. Of the bottom surface of the stopper placement recess 5, the vicinity of the angle formed with the side surface 31 is a stepped surface 32 that is one step higher than the other part of the bottom surface of the stopper placement recess 5. The stepped surface 32 is configured such that the lower end of the side surface portion 14 abuts against the stepped surface 32 when the stopper member 11 is pushed down and stored in the stopper disposing recess 5. As described above, by providing the rubber cushioning material 20 so as to project from the lower end of the side surface portion 14 of the stopper member 11, the protruding portion of the cushioning material 20, such as rubber, is stored in the stopper placement recess 5 when the stopper member 11 is stored. It contacts the stepped surface 32, and the elasticity of the cushioning material 20 can absorb the impact at the time of contact or suppress the generation of impact sound.

  Further, the stepped surface 32 with which the lower end of the side surface portion 14 of the bottom surface of the stopper disposing recess 5 hits one step higher than the other part of the bottom surface of the stopper disposing recessed portion 5. When the dust enters, the dust easily falls to the bottom surface of the stopper disposition recessed portion 5 lower than the step surface 32. Therefore, even when dust enters the stopper placement recess 5, it is unlikely that dust will be caught between the lower end of the side surface portion 14 and the stepped surface 32 when the stopper member 11 is stored. It is possible to prevent the inconvenience that the upper surface 13a of the stopper member and the upper surface of the tip portion mold material 3 cannot be flush with each other because they cannot be completely stored.

  Further, in the stopper disposition recess 5, the inner corner of the connecting portion between the upper surface portion 13 and the side surface portion 14 of the stopper member 11 and the tip end corner of the bottom surface of the stopper disposition recess 5 are each circular in cross section. The curved surfaces 23 and 33 are formed. The spring member 21 abuts between the curved surfaces 23 and 33. As shown in FIGS. 1 and 3, the spring member 21 is generally U-shaped having a curved portion 21B integrally between a pair of rod-shaped portions 21A, and biases in an opening direction between the pair of rod-shaped portions 21A (has elasticity). A plurality of stopper-shaped concave portions 5 are arranged in the platform width direction so that the rod-like portions 21A are in contact with the curved surfaces 23 and 33, respectively. The spring member 21 is urged so as to spread between the curved surface 23 of the stopper member 11 and the curved surface 33 of the stopper disposing recess 5, and thus urged to erect the stopper member 11 as shown in FIG. 1. is doing. In addition, the strength of the standing force of the stopper member 11 can be changed by increasing or decreasing the number of the spring members 21 provided.

  The stopper member locking means 51 is disposed in the vicinity of the stopper disposing recess 5 in the tip part mold 3 of the lifting platform 1 and has a sliding lock plate formed with a long hole 52a parallel to the sliding direction (front-rear direction of the platform). 52, a spacer 53 disposed inside the elongated hole 52a, a double washer 54 overlaid on the lock plate 52, the double washer 54 and the spacer 53, and further the upper plate portion 3a of the tip portion mold 3 A plurality of bolts 55 and a set of nuts 56 screwed to the bolts 55 and a ball click mechanism 60 are provided.

  Both sides of the lock plate 52 are bent portions 52b so that they can be operated by feet or hands. Further, the long hole 52a parallel to the sliding direction of the lock plate 52 is, for example, an oval shape, and the spacer 53 is positioned inside the long hole 52a to guide the lock plate 52 in a linearly slidable manner, for example, a long shape. It is an oval shorter than the hole 52a. Further, when the lock plate 52 is sandwiched between the upper plate portion 3 a of the tip end mold 3 and the double washer 54, and the spacer 53 and the double washer 54 are fastened to the upper plate portion 3 a with bolts 55 and nuts 56 and fixed. In order to allow the lock plate 52 to slide, the thickness of the spacer 53 is equal to or greater than the thickness of the lock plate 52, and is preferably slightly larger than the thickness of the lock plate 52.

  As the ball click mechanism 60, for example, as shown in FIG. 2C, a ball plunger 70 that urges the ball 71 in a protruding direction by a compression spring 72 is used, so that the ball 71 comes into contact with the lock plate 52. A ball plunger 70 is fixed through the upper plate portion 3a.

  Two holes 81, 82 are formed in the lock plate 52. When the ball 71 is engaged with the hole 81, the lock plate 52 is in the first position protruding into the stopper disposing recess 5, When the ball 71 is engaged with the hole 82, the lock plate 52 is pulled into the stopper disposition recess 5 (does not protrude with respect to the stopper disposition recess 5) and is in the second position (state of FIG. 2). ).

  When the lock plate 52 is slid to the first position (lock effective position) in a state where the stopper member 11 is pushed down into the stopper placement recess 5, as shown in FIG. 11 is extended to the upper surface portion 13 and the stopper member 11 is locked in the retracted state in the stopper disposing recess 5. In the retracted state, the stopper member 11 is locked in a state of being pulled into the stopper disposing recess 5 and does not operate as a caster stopper.

  On the other hand, when the lock plate 52 is in the second position (unlocked position), the lock plate 52 is in a position that does not protrude into the stopper disposition recess 5 and does not lock the stopper member 11. The switching of the position of the lock plate 52 is performed by the operator sliding it using the bent portions 52b on both sides of the lock plate 52 with a foot or a hand.

  Next, the operation of the caster stopper 10 of this embodiment will be described when applied to a cargo handling work machine as shown in FIG. The cargo handling work machine in FIG. 5 is provided with a parallel link 42 rotatably on a frame 41 fixed to the rear part of a chassis 40 of a lorry, and supports a link frame 43 in a horizontal state at the leading end thereof. The elevating platform 1 is connected and fixed.

  Now, in the state (illustration omitted) where the front-end | tip of the raising / lowering platform 1 (tip part mold material 3) was landed, the front end side upper surface of the raising / lowering platform 1 inclines. In the state where lock release by the stopper member locking means 51 continues (when the lock plate 52 is in the lock release position), the spring member 21 causes the stopper member 11 of the caster stopper 10 to stand up from the stopper disposition recess 5 and from the upper surface of the lift platform. It protrudes (Fig. 1). Therefore, when the carriage 44 is carried into the lifting platform 1 as shown in FIG. 5, the caster 45 rides on the upper surface 13 a of the stopper member 11, and the stopper member 11 is moved from the state shown in FIG. In the figure, it rotates clockwise and the lower end of the side surface portion 14 of the stopper member 11 comes into contact with the stepped surface 32, so that the rotation range is restricted and stopped, and the upper surface 13a becomes substantially coincident with the upper surface of the lifting platform. When the caster 45 passes the upper surface 13a, the stopper member 11 is driven by the spring member 21 so as to protrude again from the upper surface of the elevating platform. As a result, the caster 45 can be easily loaded onto the lifting platform 1 and the stopper member 11 does not interfere with the carriage loading. Note that when the carriage 44 is carried into the lifting platform 1, the caster 45 may be passed by stepping on the stopper member 11 with a foot.

  On the other hand, the caster 45 (the rear side of the carriage 44) that has passed through the stopper member 11 comes into contact with the caster stopper surface 18 of the stopper member 11 and is blocked by this even when trying to return backward. That is, the stopper member 11 has a predetermined standing angle (for example, an appropriate angle within about 45 °) by the rotation stop surface 16 at the time of standing coming into contact with the rotation restricting surface 6a of the metal part 6 on the distal end side of the pivot supporting recess 7. The caster stopper surface 18 stands up in a state of being nearly perpendicular to the upper surface of the lifting platform, and when the caster 45 hits the caster stopper surface 18, the force is not applied in the direction of pushing down the stopper member 11. Therefore, the caster 45 stops moving backward by the caster stopper 10 and the carriage 44 does not return backward.

  After the carriage 44 is carried in, the lifting platform 1 is placed in a horizontal state, and then the lifting / lowering platform 1 is brought to a height that matches the vehicle body floor surface 46 by the rotation of the parallel link 42 to carry out cargo handling using the carriage 44 and the like.

  Further, when the carriage 44 is carried out from the lifting platform 1, the caster 45 is allowed to pass through the stopper member 11 with the foot so that the upper surface 13 a substantially coincides with the lifting platform upper surface.

  The above is the basic operation of the caster stopper 10 in the state in which unlocking by the stopper member locking means 51 is continued.

  Further, the caster stopper 10 can be set not to be used by the stopper member locking means 51, and the stopper member 11 is previously retracted into the stopper disposing recess 5 with the lock plate 52 in the unlocking position. The lock plate 52 is pushed down by the limbs, and then the lock plate 52 is slid to move the lock plate 52 to the lock effective position (first position). Thereby, the lock plate 52 presses the upper surface 13a of the stopper member 11, and the stopper member 11 is locked (locked) in the retracted state in the stopper disposing recess 5. The stopper member 11 is locked in a state where the opening of the stopper disposing recess 5 is closed, that is, in a state where the upper surface 13a substantially coincides with the upper surface of the elevating platform 1 (lock effective state).

  According to the present embodiment, the following effects can be achieved.

(1) The stopper member locking means 51 has only to slide the lock plate 52 between the unlocked state (second position) and the lock effective state (first position), and the number of parts is simple. The operation of bringing the stopper member 11 into the retracted state is reliable. When the stopper member 11 is made free, when the carriage 44 is carried into the lifting platform 1, even if the stopper member 11 is standing upright, the passage of the caster 45 is not hindered. The caster 45 can be securely locked.

(2) The stopper member locking means 51 only needs to be provided in the vicinity of the stopper placement recess 5 of the tip end mold 3, and does not take up space and does not require complicated processing on the platform 1.

(3) Since the stepped portion 32 set one step higher than the bottom surface of the stopper disposing recess 5 is provided at the bottom of the stopper disposing recessed portion 5 as a portion with which the lower end of the side surface portion 14 abuts when the stopper member 11 is housed. Even if dust enters the concave portion 5 for use, it can be prevented that dust is present on the stepped surface 32 that contacts the lower end of the side surface portion 14, and the stopper member 11 can be securely stored in the concave portion 5 for arranging the stopper. The reliability of the operation of the stopper 10 can be improved.

(4) Since the side surface 31 on the rear end side of the stopper disposing recess 5 is an inclined surface that widens toward the opening, the stopper member 11 is erected even if dust exists in the stopper disposing recess 5 ( Garbage can be dropped by raising the elevating platform 1 vertically in the open state. Therefore, cleaning and discharging of the dust in the stopper disposing recess 5 can be easily performed.

(5) Since the cushioning material 20 such as rubber protruding from the lower end portion of the side surface portion of the stopper member 11 is provided, it is possible to absorb an impact when the stopper member 11 is stored and to suppress the generation of an impact sound.

(6) By fitting the pivot 12 of the stopper member 11 made of an aluminum alloy extrusion mold material into the pivot recess 7 of the tip mold 3 which is an aluminum alloy extrusion mold material via the metal part 6, the stopper The member 11 is rotatably mounted on the lifting platform 1 and does not require a separate bearing or the like, so that the structure is simple and the assembly is easy.

(7) Since the standing angle of the stopper member 11 can be increased, the amount of undulation of the stopper member 11 can be increased. Further, since the rotation range is restricted by the rotation stop surface 16 at the time of standing of the stopper member 11, a separate restricting member is unnecessary.

(8) A mechanism for obtaining a force for raising the stopper member 11 can be simply obtained by disposing the substantially U-shaped spring member 21 between the curved surface 23 of the stopper member 11 and the curved surface 33 of the stopper disposing recess 5. Can be configured.

  FIG. 4 shows a caster stopper according to the second embodiment of the present invention. In this case, the stopper member locking means 91 is disposed in the vicinity of the stopper disposing recess 5 in the tip end mold 3 of the elevating platform 1, and includes a slide type lock plate 92 and a guide member that guides the lock plate 92 in a slidable manner. 93, a set of a plurality of bolts 95 that are fastened and fixed by penetrating the upper plate portion 3 a of both side portions and the tip portion mold material 3, and a nut 96 that is screwed thereto, and a ball click mechanism 60.

  Both sides of the lock plate 92 are bent portions 92b so that they can be operated by feet or hands. Further, the gap between the guide member 93 and the upper plate portion 3a is preferably slightly larger than the thickness of the lock plate 92 so that the lock plate 92 can be smoothly slid. The width of the gap is preferably slightly larger than the width of the lock plate 92 so that the lock plate 92 is guided so as to be linearly movable.

  The arrangement of the ball click mechanism 60 is the same as that of the first embodiment, and the lock plate 92 has two holes 81 and 82. When the ball 71 is engaged with the hole 81, When the ball 71 is engaged with the hole 82, the lock plate 52 is retracted from the stopper placement recess 5 (the stopper placement recess 5). The second position does not protrude with respect to 5. The operation of switching between unlocking and the lock effective position is the same as in the first embodiment.

  The present invention has been described above by taking the embodiment as an example. However, it will be understood by those skilled in the art that various modifications can be made to each component of the embodiment within the scope of the claims.

  The standing angle of the stopper member 11 is not limited to 45 °, and may be 45 ° or more in terms of operation principle.

  The stopper member locking means 51 and 91 are attached to the upper plate portion 3a of the tip portion mold member 3 in the vicinity of the stopper arrangement concave portion 5 and slid in the front-rear direction of the platform. You may arrange | position and fix, and may provide the stopper member locking means 51 and 91 with respect to this fixing member. In this case, the slide-type lock plates 62 and 92 slide in the longitudinal direction of the stopper disposition recess 5, and the lock plates 52 and 92 move laterally from the fixing member in the stopper disposition recess 5 at the lock effective position (first position). In the unlocked state (second position), the lock plates 52 and 92 are retracted so as not to protrude onto the stopper disposition recess 5.

DESCRIPTION OF SYMBOLS 1 Lifting platform 2 Middle part mold material 3 End part mold material 4 Rear end part mold material 5 Stopper arrangement recessed part 6 Metal part 7 Pivot recessed part 10 Caster stopper 11 Stopper member 12 Pivot part 13 Upper surface part 14 Side part 18 Caster stopper surface 20 Buffer Material 21 Spring member 31 Side surface 32 Step surface 44 Dolly 45 Casters 51, 91 Stopper member locking means 52, 92 Slide type lock plate 53 Spacer 54 Double washer 60 Ball click mechanism

Claims (2)

A stopper placement recess located on the upper surface side of the tip of the lifting platform;
A pivot support recess located on the top side of the lift platform and on the tip side of the stopper placement recess;
A stopper member that is supported by the pivot support recess and is stored in the stopper placement recess or protrudes upward from the stopper placement recess;
A spring member that urges the stopper member in a direction protruding upward from the stopper disposing recess;
Stopper member locking means for holding the stopper member in a state of being stored in the stopper arrangement recess,
The stopper member includes a pivot portion rotatably supported by the pivot recess within a predetermined angle range, and extends from the pivot portion and is stored in the stopper placement recess. An upper surface portion that closes the opening, and a side surface portion that extends downward from the distal end side of the upper surface portion,
The stopper member locking means is slidably attached to the elevating platform side and has a lock plate movable between a first position protruding with respect to the stopper positioning recess and a second position not protruding. And
When the lock plate is in the first position when the stopper member is in the stopper placement recess, the lock plate and the stopper member are engaged with each other so that the stopper member is placed in the stopper placement recess. A caster stopper that locks in the retracted state while not locking the stopper member when the lock plate is in the second position.   The caster stopper according to claim 1, wherein the lock plate is held at the first position or the second position by a ball click mechanism.

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