JP4165371B2 - Seat belt device for construction machinery - Google Patents

Description

  The present invention relates to a seat belt device for a construction machine such as a hydraulic excavator or a crawler crane.

  2. Description of the Related Art Conventionally, a seat on which a driver is seated is installed in a driver's cab of a hydraulic excavator, and this seat is mounted on a box-shaped seat stand fixed to a floor plate.

  In the case where the seat belt device is provided on the seat in order to hold the lumbar part during operation and in a fall state, the belt webbing attachment and the belt buckle attachment are provided on the left and right side walls of the seat stand, respectively. The mounting tool transmits the force applied to the seat belt to the seat stand (see, for example, Patent Document 1).

  An end portion of the belt webbing is provided with a coupling fitting to be connected to the belt buckle, and this belt webbing is also known to be wound by a winding device when not in use.

  By the way, the seat of the construction machine is usually configured so that the entire seat can be tilted forward so as not to wet the seating surface or to maintain the equipment below the seat.

Such a retractable seat is configured such that the bottom surface of the seat is supported by a seat support member, and this seat support member is attached to the upper front end portion of the seat stand via a hinge. As described above, in the configuration in which the seat support member is provided between the seat and the seat stand, the fixtures of the seat belt device are fixed to the left and right sides of the seat support member in the vicinity of the seat.
JP-A-12-168499

  However, when the seat belt device fixture is fixed to the seat support member, the seat support member is required to have a strength that can withstand the load applied to the belt webbing.

  Incidentally, the JIS standard (JIS A 8911) of "Civil engineering machinery-seat belt and mounting part" stipulates that a seat belt device fastened with a belt buckle shall withstand a force of 15000 N for at least 10 seconds.

  Therefore, when the sheet is made to be retractable, the rigidity of the sheet support member has to be considerably increased. As a result, the sheet support member becomes large and the retractable sheet becomes heavy. When the retractable seat becomes large and heavy, there is a problem that the operation of tilting the seat forward cannot be performed easily and the burden on the driver increases.

  The present invention has been made in consideration of the above-described problems in the seat belt device of a conventional construction machine, and is intended to reduce the weight of the retractable seat in a configuration in which the retractable seat is equipped with the seat belt device. The present invention provides a seat belt device for a construction machine.

  The present invention provides a seat for a construction machine that is provided on a seat that is swingably mounted around a horizontal axis on a seat stand, and that includes a belt webbing, a buckle, and an attachment for attaching the buckle and the belt webbing to a fixed portion. In the belt device, one of the belt webbing attachment and the buckle attachment is attached to a bracket fixed to the upper part of the seat stand on the side of the seat, and the other is on the opposite side of the bracket. A fixing bracket is fixed to the side of the seat, near the fixture attached to the side of the seat at the upper part of the seat stand, and a sheet supporting member supporting the seat is connected to the fixing bracket through a fixing means. It is the seatbelt apparatus of the construction machine comprised as follows.

  In the present invention, as the fixing means, a lock pin that locks the seat so that it cannot swing in the attached state is provided on the seat support member, and the lock pin can be configured to be engaged with and disengaged from the fixing bracket.

  In the present invention, a winding device for winding the belt webbing can be provided while attaching the belt webbing attachment to the bracket.

  In the present invention, the seat may be configured to slide in the front-rear direction on the seat support member. In the seat belt device provided with the winding device, the belt webbing can be pulled out and the length thereof can be adjusted, so that the seat belt device can be applied to a configuration in which the seat slides back and forth on the seat support member. .

  In addition, there is only a slight gap between the seat and the control box placed on both sides of the seat, but the winding device that winds up the belt webbing is placed on the bracket side fixed to the seat stand and moves with the seat. If it is configured not to be possible, the sheet can be slid without difficulty.

  According to the present invention, even when a retractable seat is equipped with a seat belt device, the weight of the seat support member can be reduced.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  FIG. 1 shows an overall configuration of a seat belt apparatus according to the present invention.

  The figure shows the cab of the upper turning body of the construction machine, and a seat stand 1 configured in a box shape is installed on a floor panel (not shown).

  A seat 2 on which a driver is seated is attached to the upper surface of the seat stand 1.

  The lower part of the seat 2a of the seat 2 is supported by a seat support member 3, and the front end of the seat support 3 and the front upper end of the seat stand 1 are connected via a pair of hinges 4 and 4. ing. Therefore, the seat 2 can be tilted in the direction of the arrow A about the axis of the hinge 4, and the equipment arranged below the seat 2 can be inspected. The seat 2 is configured to slide in the front-rear direction along a rail provided on the seat support member 3.

  Seat belt devices 5 connected on the seating surface 2a are provided on the left and right sides of the seat 2.

  The attachment 5b of the buckle 5a provided on the right side of the seat 2 is fixed to the side surface of the seat 2, specifically, the right side surface 2c of the seat cushion 2b as shown in FIG.

  The fixture 5b is connected to the frame 2d of the seat cushion 2b via a fixing pin 2e. Further, a pair of rail guides 2f arranged in the front-rear direction and rails 2g engaged with the rail guides 2f are provided on the bottom surface of the seat 2, and each rail 2g is fixed on the base plate 2h. Yes. Mounting bolts 2i are provided at the four corners of the base plate 2h so as to be connected to the seat support member 3.

  Returning to FIG.

  On the other hand, the belt webbing 5c connected to the buckle 5a is formed into a long band material by a polyester fiber fabric, and a connecting metal fitting 5d is provided at the tip thereof. Further, a winding device 5e is fixed to a fixture (not shown) of the belt webbing 5c, and the winding device 5e is connected to the upper portion 1a of the seat stand 1 via a bracket 6. The winding device 5e functions as an attachment for the belt webbing 5c.

  The belt webbing 5c is wound up by a winding device 5e when not in use. In the figure, reference numeral 7 denotes a heater cover, and 7a denotes a hot air outlet. Reference numeral 8 denotes a control stand on which a control box (not shown) is arranged.

  FIG. 3 is an enlarged view of the attachment portion of the belt webbing 5c.

  The lower part of the bracket 6 made of steel strip is fixed to the upper side wall 1b of the seat stand 1, and the upper part of the bracket 6 is erected so as to avoid the lateral part of the seating surface 2a of the seat 2 to the left. Further, it is formed in a state of being bent in a hook shape obliquely rearward.

  An attachment hole is provided in the upper end portion 6a of the bracket 6, and an attachment hole is also provided in the lower portion 5e 'of the winding device 5e. The winding device 5e is attached to the bracket 6 by passing the connecting bolts 9 through these mounting holes and tightening them using nuts. The winding device 5e can be slightly swung in the front-rear direction with the connecting bolt 9 as a rotation axis.

  A front end portion of the belt webbing 5c protrudes from the mouth portion 5f of the winding device 5e, and a connecting metal fitting 5d is attached to the front end portion.

  FIG. 4 shows a state where the seat 2 is removed from the seat stand 1.

  In the same figure, with respect to a bracket 6 attached to the upper side wall 1b of the seat stand 1, a fixture 10 for locking a lock pin (described later) for locking the seat 2 in an attached state at a portion corresponding to the left and right direction. Is provided.

  The fixing bracket 10 includes a lock pin insertion portion 10a formed in a gate shape and a pair of fixing legs 10b extending in a wedge shape from the left and right sides of the lock pin insertion portion 10a toward the rear. The pair of fixed legs 10 b and 10 b are fixed to the cover 11.

  The cover 11 is normally closed and integrated with the seat stand 1, and is removed by removing a bolt at the time of inspection.

  In addition, a pair of hinge mounting seats 12 and 12 for mounting the hinges 4 and 4 (see FIG. 1) are formed on the front upper portion of the seat stand 1.

  FIG. 5 shows the configuration of the seat support member 3 attached via the hinges 4 and 4 and the seat lock device (fixing means) 13 provided in the seat support member 3. FIG. Is a plan view, and FIG. 5B is a side view as seen from the left side of the seat.

  The sheet support member 3 fixed to the bottom surface of the sheet 2 includes a substantially square plate 3e having ribs 3a, 3b, 3c and 3d around it, and hinges 4 and 4 are attached to the left and right sides of the front rib 3a. It is like that.

  The rib 3d is provided with a U-shaped support fitting 3f that allows the front end side of the lock pin 13a of the seat lock device 13 to pass through. The rear end side of the lock pin 13a is the front side of the plate 3e. A support plate 3g projecting laterally from the lateral edge is passed through.

  Specifically, the seat lock device 13 is composed of a rod-like member having a length substantially the same as the length in the front-rear direction of the plate 3e, and has a lock pin 13a that passes through the support fitting 3f and the support plate 3g. A lock release knob 13b for releasing the lock of the attached seat 2 is fixed to the front end.

  A flange portion 13c is fixed slightly in front of the middle of the lock pin 13a, and a compression coil spring 13d is interposed between the flange portion 13c and the support plate 3g. The compression coil spring 13d biases the lock pin 13a in the direction of arrow B, that is, on the lock side.

  The lock pin 13a urged in the direction of arrow B has its advance limit determined by the contact of the nut 13b 'fixing the unlocking knob 13b to the rear end side of the lock pin 13a with the support plate 3g. Yes.

  Further, the nut 13b 'can be moved in the front-rear direction of the lock pin 13a by rotating, so that the advance limit of the lock pin 13a can be adjusted.

  On the other hand, a disc-shaped stopper 13e having a diameter slightly larger than the outer diameter of the lock pin 13a is formed at the tip of the lock pin 13a, and this stopper 13e comes into contact with the rear end surface 3f 'of the support fitting 3f. Therefore, the retreat limit is determined. In the figure, a lock release knob 13b indicated by a two-dot chain line indicates a state in which the lock pin 13a is retracted, and a distance L indicates an amount of movement by which the tip portion 13f of the lock pin 13a is advanced or retracted.

  Further, a lock pin holding / release member 14 for holding the lock pin 13a in the retracted position is fixed to the support fitting 3f by a screw 14a. The lock pin holding / release member 14 is annularly formed on the peripheral surface of the lock pin 13a. It engages with the formed concave groove 13i.

  FIG. 6 shows the configuration of the lock pin holding / releasing member 14.

  The lock pin holding / releasing member 14 is composed of a leaf spring bent into an S-shape, and has a fixing portion 14b for fixing to the support fitting 3f at the rear end, and the fixing portion 14b includes Has a pair of through holes 14b 'through which the shaft portion of the screw 14a passes.

  A long hole-shaped notch portion 14d is formed in the spring portion 14c extending forward from the fixed portion 14b. This notch 14d is notched so as to freely advance and retract the lock pin 13a.

  A vertical plate portion 14e is formed on the distal end side of the spring portion 14c, and an elliptical opening 14f whose longitudinal direction is the long axis side is formed in the vertical plate portion 14e.

  The opening 14f is formed so that the lock pin 13a can be passed through, and the longitudinal length H is slightly larger than the diameter D of the lock pin 5a. The upper edge 14f 'of the opening fits into the groove 13i of the lock pin 13a when the free end 14g of the spring portion 14c is free, and when the upward pressing force C acts on the free end 14g. It comes off from the concave groove 13i.

  Further, the free end 14g receives an upward pressing force C by contacting the upper surface of the seat stand 1 when the seat 2 is lowered onto the seat stand 1, and is elastically deformed. When the upper edge 14f 'of the opening is disengaged from the concave groove 13i by this elastic deformation, the lock pin 13a is moved in the lock direction by the urging force of the compression coil spring 13d, whereby the lock pin 13a is locked to the fixing bracket 10, The seat 2 can be automatically locked.

  If the lock pin 13a is locked to the fixing bracket 10 after the seat 2 is placed on the seat stand 1 in this way, the depth of advancement with respect to the fixing bracket 10 can be increased. 2 can be securely locked.

  On the other hand, when the lock release knob 13b is pulled, the lock pin 13a can be detached from the fixture 10 and the lock of the seat 2 can be released. At this time, since the urging force is accumulated in the spring portion 14c, the seat 2 and the seat stand 1 are slightly separated in a state where the unlocking knob 13b is pulled. When the ′ and the concave groove 13i are opposed to each other, the opening upper edge 14f ′ is engaged with the concave groove 13i by the accumulated biasing force, and the lock pin 13a is held in the retracted position.

  As described above, in the seat belt device of the present embodiment, the bracket 6 is fixed to the upper portion 1a of the seat stand 1, and one of the seat belt fixtures that are originally attached to the left and right sides of the seat support member 3 is attached to the bracket 6. It is configured to be attached to. The other attachment 5b (see FIG. 1) is attached to the seat support member 3 in the same manner as in the prior art, but it is fixed to the upper part of the seat stand 1 close to the portion where the attachment 5b is attached. 10 is provided, and the seat support member 3 and its fixture 10 are connected via the seat lock device, so that all the force applied to the seat belt device can be transmitted to the seat stand 1.

  Therefore, the seat support member 3 is not required to have a strength capable of withstanding the force applied to the seat belt device, and the seat support member 3 can be configured with only a steel plate as shown in FIG. Can do.

  In FIG. 3, the moment acting on the lock pin 13a is reduced by shortening the horizontal distance S between the fixing pin 2e fixing the fixture 5b and the fixing bracket 10 fixed to the seat stand 1 as much as possible. Accordingly, the seat lock device can be reduced in size and weight.

  Further, since there is only a slight gap between the seat 2 and the control boxes disposed on both sides thereof, when the take-up device 5e is attached to the side of the seat, the take-up device 5e is slid when the seat 2 is slid in the front-rear direction. Get in the way. On the other hand, in this embodiment, since the winding device 5e is arranged on the bracket 6 side fixed to the seat stand 1 and does not move, the seat 2 can be slid back and forth without difficulty.

1 is a perspective view showing an overall configuration of a seat belt device according to the present invention. It is a principal part enlarged view which shows the structure of the left side attachment part of the seatbelt apparatus shown in FIG. It is a side view which shows the structure of the right side attachment part of the seatbelt apparatus shown in FIG. It is a perspective view which shows the structure of the seat stand shown in FIG. (a) is a top view which shows the structure of a sheet | seat support member and a sheet | seat locking device, (b) is the side view. It is a perspective view which shows the structure of the lock pin holding | maintenance / release member shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat stand 1b Upper side wall 2 Seat 2a Seat surface 3 Seat support member 4 Hinge 5 Seat belt device 5a Buckle 5b Attachment 5c Belt webbing 5d Connecting metal fitting 5e Winding device 6 Bracket 8 Control stand 9 Connecting bolt 10 Fixing metal 11 Cover 13 Seat Lock Device 14 Lock Pin Holding / Release Member

Claims (4)

In a seat belt device for a construction machine, provided on a seat that is swingably mounted on a seat stand so as to be swingable around a horizontal axis, and having a belt webbing, a buckle, and a fitting for attaching the buckle and the belt webbing to a fixed part.
One of the belt webbing attachment and the buckle attachment is attached to a bracket fixed to the top of the seat stand on the side of the seat, and the other is opposite to the bracket. Attached to the side of the seat,
At the upper part of the seat stand, a fixing bracket is fixed in the vicinity of the fixture attached to the seat side surface,
A seat belt device for a construction machine, wherein a seat supporting member supporting the seat is connected to the fixing bracket via a fixing means.   The lock pin for locking the seat so as not to swing in the mounted state as the fixing means is provided on the seat support member, and the lock pin is configured to be engaged with and disengaged from the fixing bracket. Seat belt equipment for construction machinery.   The seatbelt device for a construction machine according to claim 1 or 2, further comprising: a winding device that winds up the belt webbing while the bracket webbing attachment is attached to the bracket.   The seatbelt apparatus for a construction machine according to any one of claims 1 to 3, wherein the seat is configured to slide in the front-rear direction on the seat support member.

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