JP2005132207A - Seat lock device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat lock device allowing the operator to perform operations stably by locking a seat of forward tilting type certainly. <P>SOLUTION: The seat lock device to lock the seat in the mounted condition is equipped with a lock pin 5a installed either on the seat side or the seat stand side so as to be able to advance and retreat, an engaging member 7 installed on the other for engaging the lock pin 5a advanced, a coil spring 5d to energize the lock pin 5a toward the engaging member 7, an unlocking knob 5b to retreat the lock pin 5a against the energizing force of the coil spring 5d and separate it from the engaging member 7, and a lock pin holding/disengaging member 6 to hold the lock pin 5a in the retreated position and disengage it. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seat lock device suitable for a seat of a construction machine.

  2. Description of the Related Art Conventionally, there are some construction machine seats configured so that the entire seat can be tilted forward so as not to wet the seating surface or to maintain equipment below the seat (for example, Patent Documents). 1).

  This type of seat is usually provided with a seat lock device to prevent the seat from falling forward even when the driver sits shallow on the front side of the seating surface.

  As shown in FIG. 5, the sheet support member 51 that supports the bottom surface of the sheet 50 is attached via a hinge 53 provided at the upper front end portion of the box-shaped seat stand 52. The center can be rotated to a substantially vertical position indicated by a two-dot chain line.

  The seat lock device includes a lock pin 55 that is biased in the direction of arrow A by a spring 54, a cam surface 56a that contacts the tip of the lock pin 55, and a lock hole through which the lock pin 55 passes. The member 56 is mainly configured.

  When the seat 50 in the vertical position is lowered, first, the cam surface 56a of the locking member 56 comes into contact with the tip of the lock pin 55, and the lock pin 55 is opposite to the arrow A direction against the urging force of the spring 54. Retreat in the direction.

When the cam surface 56a and the tip of the lock pin 54 come into contact with each other and the seat 50 is lowered, and the tip of the lock pin 55 is fitted into the lock hole of the lock member 56, the lock pin 55 is moved by the biasing force of the spring 54. The locking member 56 is penetrated, whereby the seat 50 is automatically locked. In the figure, 57 is a lever for releasing the lock of the seat 50.
Japanese Unexamined Patent Publication No. 7-186791

  However, in the conventional seat lock device, when the seat 50 is locked to the seat stand 52, the lock pin 55 is retracted by the cam surface 56a. Is limited to a small size.

  Accordingly, when locking, the lock pin 55 cannot be penetrated deeply into the locking member 56, and if the locking member 56 is deformed or the urging force of the spring 54 is reduced, the seat lock becomes uncertain. was there.

  The present invention has been made in consideration of the problems in the conventional seat locking device as described above, and provides a seat locking device capable of reliably locking a forward-sliding seat regardless of the seating position of the driver. Is.

  The present invention provides a seat lock device that locks a seat that can be swung around a horizontal axis on a seat stand so that it cannot swing in a mounted state, and is provided on either the seat side or the seat stand side so as to be able to advance and retreat. Against the urging force of the urging force, the urging means for urging the lock pin, the urging member provided on one of the other, and urging the locked lock pin, A seat lock device comprising: a lock release means for retracting the lock pin and releasing it from the locking member; and a lock pin holding / release means for holding the lock pin in the retracted position and releasing the hold.

  In the present invention, the lock pin and the locking member can be arranged on the lateral side of the lower portion of the seat in a state where the seat is placed on the seat stand.

  In the present invention, the lock pin holding / releasing means has a groove formed in the lock pin, and a leaf spring that can be engaged with and disengaged from the groove, and the leaf spring is a bent portion that can be elastically deformed. When the lock pin is moved to the retracted position and the seat and the seat stand are separated from each other, the engaging portion engages with the groove to hold the lock pin in the retracted position. When the separated sheet and the sheet stand come into contact with each other, the distal end portion of the bent portion is pushed and elastically deformed, and the engaging portion can be configured to be disengaged from the groove portion.

  According to the present invention, there is an advantage that the forward-falling type seat can be reliably locked regardless of the seating position of the driver.

  In addition, according to the present invention, the seat lock device can be compactly arranged on the lateral side of the lower portion of the seat, so that it is not necessary to secure a seat lock device mounting space in the seat stand.

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

  FIG. 1 shows an embodiment of a seat lock device according to the present invention.

  In the figure, reference numeral 1 denotes a sheet disposed in a cab of a construction machine, and the bottom surface of the sheet 1 is supported by a sheet support member 2.

  The front end portion of the seat member 2 is connected to the front upper end portion of the box-shaped seat stand 4 via the hinge 3, and the seat 1 is rotated in the direction of the arrow B to a substantially vertical position indicated by a two-dot chain line. It can be moved.

  A seat lock device 5 is disposed on the side of the seat support member 2.

  2A and 2B show the configuration of the seat lock device 5. FIG. 2A is a plan view, and FIG. 2B is a side view as seen from the left side of the seat. The seat 1 is removed.

  The sheet support member 2 fixed to the bottom surface of the sheet 1 is composed of a substantially square plate 2e having ribs 2a, 2b, 2c, 2d around it, and hinges 3, 3 are attached to the left and right sides of the front rib 2a. It is like that.

  On the rib 2d, a U-shaped support fitting 2f that allows the front end side of the lock pin 5a of the seat lock device 5 to pass through is projected sideways, and the rear end side of the lock pin 5a is the front side of the plate 2e. A support plate 2g that projects laterally from the lateral edge is passed through.

  Specifically, the seat lock device 5 is composed of a rod-like member having a length substantially the same as the length in the front-rear direction of the plate 2e, and has a lock pin 5a that passes through the support fitting 2f and the support plate 2g. An unlocking knob (unlocking means) 5b for unlocking the seat 1 is fixed to the front end.

  A flange portion 5c is fixed slightly in front of the middle of the lock pin 5a, and a compression coil spring (biasing means) 5d is interposed between the flange portion 5c and the support plate 2g. The compression coil spring 5d biases the lock pin 5a in the direction of arrow C, that is, on the lock side.

  The lock pin 5a urged in the direction of arrow C has its advance limit determined by the contact of the nut 5b 'fixing the unlocking knob 5b to the rear end side of the lock pin 5a with the support plate 2g. Yes.

  Further, the nut 5b 'can be moved in the front-rear direction of the lock pin 5a by rotating, so that the advance limit of the lock pin 5a can be adjusted.

  On the other hand, a disc-shaped stopper 5e having a diameter slightly larger than the outer diameter of the lock pin 5a is formed at the tip of the lock pin 5a, and this stopper 5e comes into contact with the rear end surface 2f 'of the support fitting 2f. Therefore, the retreat limit is determined. In the figure, a lock release knob 5b indicated by a two-dot chain line indicates a state in which the lock pin 5a is retracted, and a distance L indicates a moving amount by which the tip portion 5f of the lock pin 5a is advanced or retracted.

  A lock pin holding / release member 6 for holding the lock pin 5a in the retracted position is fixed to the support fitting 2f by a screw 6a. The lock pin holding / release member 6 is annularly formed on the peripheral surface of the lock pin 5a. It engages with the formed groove 5i (see FIG. 2B).

  The configuration will be described in detail with reference to FIGS.

  As shown in FIG. 3, the lock pin 5a has a concave groove 5i formed near the tip. Reference numeral 5j denotes a male screw portion for fixing the lock release knob 5b.

  FIG. 4 shows a configuration of a lock pin holding / release member (lock pin holding / release means) 6 that engages or disengages with respect to the concave groove 5i. FIG. 4 (a) is a plan view. (b) is a front view, (c) is a side view, and (d) is a rear view.

  The lock pin holding / releasing member 6 is configured by a leaf spring bent into an S shape, and has a fixing portion 6b for fixing to the support metal fitting 2f at the rear end portion. A pair of through holes 6b 'through which the shaft portion of the screw 6a passes are formed.

  An elongated hole-shaped notch 6d is formed in a spring portion (bent portion) 6c extending forward from the fixed portion 6b. The notch 6d is notched so as to freely advance and retract the lock pin 5a.

  A vertical plate portion 6e is formed on the distal end side of the spring portion 6c, and an elliptical opening 6f whose longitudinal direction is the long axis side is formed in the vertical plate portion 6e.

  The opening 6f is formed so that the lock pin 5a can be passed through, and the longitudinal length H is formed slightly larger than the diameter of the lock pin 5a. Further, when the free end 6g of the spring portion 6c is free, the upper edge (engagement portion) 6f 'of the opening fits into the concave groove 5i of the lock pin 5a, and an upward pressing force D is applied to the free end 6g. When it acts, it comes off from the concave groove 5i.

  When the upper edge 6f 'of the opening is disengaged from the groove 5i of the lock pin 5a, the lock pin 5a can freely move back and forth. By pulling the lock release knob 5b, the lock pin 5a can be removed from the locking member 7 described later. The seat 1 can be released and the lock of the seat 1 can be released. Further, since the urging force is accumulated in the spring portion 6c, when the seat 1 and the seat stand 4 are slightly separated in the state where the unlocking knob 5b is pulled and the pressing force D is eliminated, the opening upper edge 6f 'and the concave groove At the point of time facing 5i, the opening upper edge 6f 'is engaged with the concave groove 5i by the accumulated biasing force, and the lock pin 5a is held in the retracted position.

  A locking member 7 shown in FIG. 1 is provided on the upper surface of the seat stand 4 in the advancing direction of the lock pin 5a.

  The locking member 7 has a gate shape when viewed from the direction of the arrow E, and the distal end portion 5f of the lock pin 5a passes through the locking member 7.

  Next, the operation of the seat lock device having the above configuration will be described with reference to FIG.

a) When the seat 1 is placed on the seat stand 4 When the seat 1 is placed on the seat stand 4, the free end 6 g of the lock pin holding / releasing member 6 is connected to the upper surface of the seat stand 4. The contact is pushed upward, whereby the engagement between the opening upper edge 6f 'of the lock pin holding / release member 6 and the groove 5i (see FIG. 3) of the lock pin 5a is released.

  Since the lock pin 5a can advance in the direction of arrow F, that is, the lock direction by the biasing force of the compression coil spring 5d, the stopper 5e protrudes from the rear end of the locking member 7 after passing through the locking member 7.

  In this state, even if the driver moves and sits in front of the seat surface of the seat 1, the front end portion 5 f of the lock pin 5 a has entered deeply into the locking member 7, so that the seat 1 is not unlocked. . Moreover, even if the rear portion of the sheet 1 is lifted, the stopper 5e formed at the front end portion 5f of the lock pin 5a engages with the rear end portion of the locking member 7, so that the seat 1 is securely locked.

b) When the seat 1 is tilted forward When the unlocking knob 5b is pulled in the direction of the arrow G and a slight gap is formed between the seat 1 and the upper surface of the seat stand 4, the spring portion 6c of the lock pin holding / releasing member 6 The opening upper edge 6f 'fits into the concave groove 5i of the lock pin 5a by the restoring force.

  Therefore, the lock pin 5a is held by the lock pin holding / release member 6 in the retracted position. In this state, for example, the equipment below the seat 1 can be inspected and maintained.

c) When the seat 1 is returned When the seat 1 that has been tilted down is returned to the original position on the seat stand 4, the lock pin 5a is held in the retracted position, and is thus engaged with the locking member 7. The sheet 1 is returned without holding.

  When the seat 1 is returned onto the seat stand 4, the free end 6 g of the lock pin holding / releasing member 6 comes into contact with the upper surface of the seat stand 4, whereby the upper edge 6 f ′ of the lock pin holding / releasing member 6 is opened. The lock pin 5a is disengaged from the concave groove 5i.

  The lock pin 5a from which the upper edge 6f 'of the opening is disengaged is pushed in the direction of arrow F by the urging force of the compression coil spring 5d, and the distal end portion 5f of the lock pin 5a passes through the locking member 7. Thereby, the lock pin 5a and the locking member 7 are automatically locked.

  When the lock pin 5a is locked to the locking member 7 after the seat 1 is placed on the seat stand 4 in this way, the advancement depth with respect to the locking member 7 can be increased. The seat 1 can be reliably locked.

  Further, according to the seat lock device of the present embodiment, the locking member 7 to which the lock pin 5a is locked only needs to pass through the lock pin 5a.

  In the above-described embodiment, the lock pin 5a is disposed on the seat 1 side and the locking member 7 is disposed on the seat stand 4 side. In this case, the lock pin holding / releasing member 6 is pressed against the lower surface of the sheet 1 to be returned to the original state, and is released from the concave groove 5i of the lock pin 5a.

  Further, according to the seat lock device of the above embodiment, the lock pin 5a and the locking member 7 can be assembled and arranged on the lateral side of the lower portion of the seat 1, so that the space in the seat stand 4 is not used. The seat lock device can be configured compactly.

1 is a side view of a seat to which a seat lock device according to the present invention is applied. (a) is a plan view of the seat lock device shown in FIG. 1, and (b) is a side view thereof. It is a side view which shows the structure of a lock pin. (a) is a plan view showing the configuration of the lock pin holding / releasing member, (b) is a front view, (c) is a side view, and (d) is a rear view. It is a side view which shows the structure of the conventional seat lock apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet | seat 2 Sheet | seat support member 3 Hinge 4 Seat stand 5 Seat lock apparatus 5a Lock pin 5b Lock release knob 5d Compression coil spring 5e Stopper 5f Tip part 5i Concave groove 6 Lock pin holding | maintenance / release member 6c Spring part 6f Opening 6f 'On opening Edge 6g Free end 7 Locking member

Claims (3)

In a seat lock device that locks a seat that can be swung around a horizontal axis on a seat stand so that it cannot swing in a mounted state,
A lock pin provided on either the seat side or the seat stand side so as to be able to advance and retreat, a lock member provided on either of the lock pins for locking the lock pin, and the lock pin directed toward the lock member An urging means for urging the lock pin, an unlocking means for retracting the lock pin against the urging force of the urging means and releasing the lock pin from the locking member, and holding and holding the lock pin in the retracted position. A seat lock device comprising: a lock pin holding / release means for releasing.   2. The seat lock device according to claim 1, wherein the lock pin and the locking member are arranged on a lateral side of a lower portion of the seat in a state where the seat is placed on the seat stand.   The lock pin holding / releasing means has a groove portion formed in the lock pin and a leaf spring that can be engaged with and disengaged from the groove portion. When the lock pin is moved to the retracted position and the seat and the seat stand are separated from each other, the engaging portion engages with the groove and the lock pin is moved to the retracted position. When the seat held by and separated from the sheet stand comes into contact, the tip of the bent portion is pushed and elastically deformed, and the engaging portion is configured to be disengaged from the groove portion. The seat lock device according to 1 or 2.

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