JP4757219B2 - Tailgate fall prevention mechanism - Google Patents

Description

  The present invention relates to a tailgate drop prevention mechanism for a garbage truck, and more particularly to a mechanism having a safety rod fixing mechanism for preventing a tailgate from dropping.

As described in Patent Documents 1 to 3, there is known a dust collection vehicle in which a tail gate having a dust loading device built in at the rear upper end of the dust storage box is pivotally attached.
The garbage trucks described in Patent Documents 1 to 3 include a safety rod for preventing the tailgate from unexpectedly dropping.
The safety rod has a base end pivotally supported on a side portion of the rear frame of the dust storage box, and a distal end is rotatable in the front-rear direction. The safety bar is stored in the rear frame when not in use, and when used, the tip is rotated rearward so as to protrude rearward and engage with the tailgate, thereby supporting the tailgate in an open state.

Patent Document 1 describes a mechanism in which an operation lever and left and right safety bars are interlocked with each other by a member disposed in a rear frame of a dust container box.
Japanese Patent Application Laid-Open No. 2004-228667 discloses a dust bin comprising a safety rod hinged to a rear frame of a dust storage box, a spring for biasing the safety rod to a collapsed position, and a cylinder device for raising the safety rod. Collection vehicles are listed.
Patent Document 3 describes a holding lever (15 in the same document) that fixes a safety rod in a retracted state by a spring force.
Japanese Utility Model Publication No. 63-178202 JP 63-8102 A Japanese Utility Model Publication No. 61-78105

However, the above conventional techniques have the following problems.
Regardless of the operator's operation, if the stored safety rod falls down unexpectedly, there is a danger of hitting the operator. In particular, in a vehicle model that dumps a dust storage box, there is a high risk of falling if the safety rod is not fixed when dumping the dust storage box.
In patent document 1, the fixing means at the time of storing of a safety rod is not specifically disclosed.
In Patent Document 2, the safety rod can be held in a retracted state by a cylinder device that operates the safety rod. However, if a fixing means for simply storing the safety rod is desired, the device is large and expensive. Become.
In Patent Document 3, there is a possibility that the fixing may be uncertain depending on the spring force, and if the spring force is increased, the operation becomes difficult.

  The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide a tailgate fall prevention mechanism that can securely fix a safety rod in a retracted state with a simple structure.

In the invention according to claim 1 for solving the above-mentioned problem, the base end is rotatably supported on the side portion of the rear frame of the refuse storage box pivotally attached to the tailgate, and the distal end is supported by the rotation operation. A safety rod that engages the tailgate in a state of protruding from the rear frame toward the tailgate and supports the tailgate in an open state;
The base end is pivotally supported by the tip side of the fulcrum of the safety rod, and the tip is engaged with the rear frame by the pivoting operation, so that the safety rod is rotated to the rear frame side. A tailgate fall prevention mechanism including a stopper member that is fixed in a retracted state.

  According to a second aspect of the present invention, the stopper member is attached so as to protrude to the rear side of the safety rod, and the rear portion of the rear frame is in a retracted state in which the safety rod is rotated to the rear frame side. The tailgate drop prevention mechanism according to claim 1, wherein the safety rod is fixed in a retracted state by being sandwiched between an edge and the safety rod.

The invention according to claim 3 includes a rod having one end hinged to a portion on the tip side of the fulcrum of the stopper member, and an operation lever having an operating point hinged to the other end of the rod,
The safety rod is retracted by rotating the operation lever in one direction and fixed to the retracted state by the stopper member,
The operation lever is pivoted in the opposite direction to release the fixing of the safety rod by the stopper member and to allow the safety rod to be protruded from the rear frame to the tailgate side. The tailgate fall prevention mechanism according to claim 1 or 2.

The invention according to claim 4 includes a pair of the safety rod, the stopper member, the rod and the operation lever on both sides of the rear frame,
4. The tailgate drop prevention mechanism according to claim 3, further comprising an interlocking shaft having both ends coupled to fulcrums of both operation levers and interlocking both operation levers.

  According to the present invention, the safety rod can be fixed in the retracted state with a simple configuration including the stopper member rotatably supported by the safety rod, and the safety rod can be reliably fixed in the retracted state with a simple structure. There is an effect.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

  FIG. 1 is a rear side view of a garbage collection vehicle employing a tailgate fall prevention mechanism according to an embodiment of the present invention. In FIG. 1, the tailgate is shown open and the safety bar is shown retracted.

As shown in FIG. 1, a rear frame 2 is fixed to the periphery of the rear opening of the dust collection box 1. The rear frame 2 is a quadrilateral frame composed of linear portions on the upper, lower and left and right sides.
A tailgate 3 is pivotally attached to the upper part of the rear frame 2 via a pivot 4. A lower part of the rear frame 2 is pivotally attached to the chassis 6 via a pivot 7, and the dust collecting box 1 is configured to be dumped around the pivot 7.

  FIG. 2 is a cross-sectional view taken along line AA when the tailgate is closed. FIG. 3 is a detailed view of the lower part when the tailgate is closed, and the left side is viewed from below.

  The tailgate fall prevention mechanism of the present embodiment includes a safety bar a1, members a2 to a5 for mounting the safety bar a1, a stopper member b1, members b2 to b3 for mounting the stopper member b1, and an operation mechanism c. It consists of.

  A base end of the safety rod a1 is rotatably connected to a bracket a2 coupled to a side portion of the rear frame 2 via a pin a3. Further, a front edge receiving member a4 of the safety rod a1 at the time of storage is provided on the side portion of the rear frame 2. A tip receiving member a5 of a safety bar a1 when the tailgate is supported is provided on the side front edge of the tailgate 3. The front edge receiving member a4 includes a buffer member such as rubber that contacts the safety bar a1. The tip receiving member a5 reinforces the portion of the tailgate 3 with which the tip of the safety bar a1 comes into contact.

  The base end of the stopper member b1 is rotatably supported by a portion on the distal end side with respect to the fulcrum of the safety bar a1. In other words, a portion of the safety bar a1 on the tip end side of the pin a3 is rotatably connected to the bracket b2 connected via the pin b3. The condition is that the rotation shaft at the base end of the stopper member b1 is closer to the distal end side of the safety rod a1 than the rotation shaft of the safety rod a1.

  As shown in FIG. 2, a cylindrical member b5 is disposed at the tip of the stopper member b1. The stopper member b1 includes a plate member b4 and a columnar member b5, and the columnar member b5 is vertically coupled to the distal end portion of the plate member b4. The columnar member b5 is a member that comes into contact with the rear edge 2a of the rear frame 2.

  The plate member b4 of the stopper member b1 has a triangular shape in which pins b3 and a cylindrical member b5 are arranged at two corners. The operating rod c2 is connected via a pin c1 arranged at the remaining one corner.

  The upper end of the operation rod c2 is connected to the plate member b4 of the stopper member b1 via the pin c1. The lower end of the operating rod c2 is connected to the operating point of the operating lever c4 via a pin c3. The operation rod c2 is connected to the rear frame 2 via a tension spring c5, and is urged upward by the tension spring c5.

  The tailgate fall prevention mechanism of the present embodiment includes the above-described configurations a1 to a5, b1 to b5, and c1 to c5 in a pair of left and right. The fulcrums of the left and right operation levers c4 and c4 are coupled so as to integrally rotate coaxially by an interlocking shaft c6. The interlocking shaft c6 is passed through the left and right brackets c7 and c7 and is held rotatably. The interlocking shaft c6 is passed through the lower part of the rear frame 2.

  In the above configuration, the pivot shafts 4 and 7, the pins a3, b3, c1 and c3, and the rotation shaft of the interlocking shaft c6 are all in the same direction (direction perpendicular to the drawing in FIG. 1).

  Next, the operation of the tailgate fall prevention mechanism of this embodiment will be described with reference to FIGS. FIG. 5 shows the maximum protruding state of the safety rod, and FIG. 4 shows the intermediate state between FIG. 1 and FIG.

A direction d1 shown in FIGS. 1, 4 and 5 indicates a rotation direction in which the safety rod a1 is rotated when the safety rod a1 is stored, and a direction d2 indicates the opposite rotation direction.
As shown in FIG. 1, the safety rod a1 during storage is within the thickness of the rear frame 2, and the front edge of the safety rod a1 is in contact with the front edge receiving member a4. The stopper member b1 protrudes rearward from the safety bar a1 and engages with the rear edge 2a of the rear frame 2. As shown in FIG. 2, the engagement is performed by contacting the columnar member b <b> 5 at the tip of the stopper member b <b> 1 with the rear edge 2 a of the rear frame 2. That is, the stopper member b1 is sandwiched between the rear edge 2a of the rear frame 2 and the safety rod a1.
As a result, even if a force that rotates the safety bar a1 in the direction d2 is applied, the safety bar a1 is supported at the contact point of the cylindrical member b5 via the stopper member b1, and thus does not move. That is, the safety rod a1 is fixed in the retracted state by the stopper member b1.

A case where the safety bar a1 is used by moving it backward from the retracted state shown in FIG. 1 will be described.
First, the operator holds down at least one operation lever c4 and lowers it. As a result, the operation lever c4 rotates in the direction d1, and the pin c1 is pulled down via the operation rod c2. Then, the stopper member b1 rotates in the direction d2 about the pin b3, and the columnar member b5 at the tip is detached from the rear edge 2a of the rear frame 2. Thereby, fixation of the safety rod a1 by the stopper member b1 is released.

  When the cylindrical member b5 is detached from the rear edge 2a, the operation lever c4 is further lowered and the stopper member b1 is rotated in the direction d2, as shown in FIG. 4, the end of the plate member b4 of the stopper member b1 is a safety rod The movement is restricted by coming into contact with the rear edge of a1. As a result, the stopper member b1 can no longer rotate in the direction d2 with respect to the safety bar a1. Thereafter, when the operation lever c4 is lowered, the safety bar a1 rotates in the direction d2. When the safety bar a1 rotates in the direction d2 and the lower end surface of the safety bar a1 contacts the rear frame 2, the safety bar a1 can support the tailgate 3 as shown in FIG. The tailgate 3 is lowered, the tip receiving member a5 is applied to the tip of the safety bar a1 as shown by a one-dot broken line in FIG. 1, and the tailgate 3 is supported by the safety bar a1.

Next, the case where the safety rod a1 is changed to the retracted state shown in FIG. 1 from the state where the tailgate 3 is supported by the safety rod a1 will be described.
First, the tailgate 3 is raised, and the tailgate 3 is separated from the tip of the safety bar a1 as shown in FIG.

  The operator raises at least one operation lever c4 upward. As a result, the operation lever c4 rotates in the direction d2, and the pin c1 is pushed up via the operation rod c2. At this time, since the line of force acting on the pin c1 is between the pin a3 and the pin b3, the stopper member b1 does not rotate with respect to the safety bar a1, and the stopper member b1 and the safety bar a1 are integrated. And turn. The safety bar a1 rotates about the pin a3 in the direction d1, and the state shown in FIG. 4 is obtained. The tension spring c5 reduces the operating force that raises the operating lever c4.

When the operation lever c4 is further raised, the safety bar a1 rotates in the direction d1 and hits the front edge receiving member a4, and the stopper member b1 rotates in the direction d1 around the pin b3, and the cylindrical member b5 at the tip. Engages with the rear edge 2 a of the rear frame 2. As a result, the safety bar a1 is stored, and the safety bar a1 is fixed in the stored state by the stopper member b1.
In this retracted state, the tension spring c5 provides a holding force for holding the stopper member b1 so that the stopper member b1 does not fall down when the dust collecting box 1 is dumped or when vibration is generated.

According to the above-described embodiment of the present invention, the safety rod a1 can be reliably fixed in the retracted state by the simple configuration of the stopper member b1.
In the above embodiment, the operation mechanism c including the components c1 to c7 is configured. However, this may be omitted and the stopper member b1 may be directly operated and used.

According to the present embodiment, the left and right mechanisms are interlocked by the interlocking shaft c6, and the whole can be operated at one place.
Further, according to this embodiment, by configuring the operation lever c4 on both the left and right sides, the operation can be performed on either the left or right side, and the operability is further improved.

It is a rear part side view of the refuse collection vehicle which employ | adopted the tailgate fall prevention mechanism which concerns on one Embodiment of this invention, and shows the retracted state of a safety rod. FIG. 2 is a cross-sectional view taken along line AA shown in FIG. 1 when the tailgate is closed. It is the figure which looked down at the left side part from the lower part detailed view at the time of tailgate closing. It is a rear part side view of the garbage truck which employ | adopted the tailgate fall prevention mechanism which concerns on one Embodiment of this invention, and shows the intermediate state of a safety rod. FIG. 3 is a rear side view of a garbage truck that employs a tailgate fall prevention mechanism according to an embodiment of the present invention, showing a maximum protruding state of a safety rod.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust collection box 2 Back frame 3 Tailgate 4, 7 Axis 6 Chassis a1 Safety rod b1 Stopper member c Operation mechanism c2 Operation rod c4 Operation lever c5 Tension spring c6 Interlock shaft

Claims (4)

A base end is pivotally supported on a side portion of a rear frame of a dust storage box pivotally attached to the tailgate, and the tailgate is protruded from the rear frame to the tailgate side by the pivoting operation. A safety rod that engages with and supports the tailgate in an open state;
The base end is pivotally supported by the tip side of the fulcrum of the safety rod, and the tip is engaged with the rear frame by the pivoting operation, so that the safety rod is rotated to the rear frame side. A tailgate fall prevention mechanism comprising a stopper member that is fixed in a retracted state. The stopper member is attached so as to protrude to the rear side of the safety rod, and in a retracted state in which the safety rod is rotated to the rear frame side, between the rear edge of the rear frame and the safety rod. The tailgate drop prevention mechanism according to claim 1, wherein the safety rod is fixed in a retracted state by being sandwiched between two. A rod having one end hinged to the tip side of the fulcrum of the stopper member, and an operating lever hinged to the other end of the rod;
The safety rod is retracted by rotating the operation lever in one direction and fixed to the retracted state by the stopper member,
The operation lever is pivoted in the opposite direction to release the fixing of the safety rod by the stopper member and to allow the safety rod to be protruded from the rear frame to the tailgate side. The tailgate fall prevention mechanism according to claim 1 or 2. The safety bar, the stopper member, the rod and the operation lever are provided in a pair on both sides of the rear frame,
4. The tailgate drop prevention mechanism according to claim 3, further comprising an interlocking shaft having both ends coupled to fulcrums of both operation levers and interlocking both operation levers.

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