JPH0325593B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a locking device for a canvas door that is installed in a truck cargo box and the like and can be opened wide.

[Prior Art] Conventionally, in the case of a door lock device for a vehicle, for example, a latch is installed inside a corner post or a center pillar so as to be freely retractable, and a striker that engages with the latch is provided on the side of the door body. Common. Further, in the case of a vehicle such as a truck equipped with a cargo box, a door lock device consisting of a latch and a striker is provided on the door body provided at the side opening of the cargo box and on the corner post.

By the way, in conventional door lock devices installed in trucks, etc., the latches provided at the top and bottom of the corner posts were arranged facing in the same direction, so if the vehicle body vibrates in the vertical direction while the vehicle is running, etc., the door locks will not lock. There was a problem that the door body would open when the door was unlocked.Also, even when the door lock was unlocked, the latch protruded from the side of the corner post, so it could catch on workers' clothes or cause luggage to get caught in the latch. There was a problem in that the loading and unloading of cargo was hindered by this problem, and the safety of the work was compromised.

By the way, Japanese Utility Model Application Publication No. 52-1497 discloses a locking means in which the tips of the upper and lower latches are arranged so as to face oppositely so that the lock will not be released even if the door vibrates up and down. ing.
However, in this prior art, the latch simply rotates to engage the striker, which does not allow the canvas door to be tensioned, causing it to sag, resulting in poor appearance quality, and also causing the canvas door to bounce while the truck is in motion. There are problems such as sagging, making noise, and damaging the fabric.

As a means to eliminate the drawbacks with the prior art,
Japanese Patent Publication No. 43-6760 discloses that when the lock is released, the latch retracts into the corner post, and when the door is locked, after the latch engages with the door body,
A locking means is disclosed that allows the door body to be pulled. In this prior art, a latch, which is always urged outward by an elastic member, is pivoted so that it can move in and out of a long groove, and the latch housed in the door frame is rotated by a link mechanism that rotates a handle. When the latch is engaged with a striker attached to the door side and the handle is further rotated, the latch is pulled into the door frame against the biasing force of the elastic member.

However, this prior art has the problem that because the stroke for pulling the door must be provided within the narrow door frame, it is not possible to provide a sufficient arm length for rotating the latch, and it is not possible to make both the stroke and the pulling force sufficiently large. There is.

[Purpose of the invention]

The present invention has been made in view of the above problems, and provides a door lock that can be easily stored in a post that forms the vertical frame of a canvas door, and that can easily increase the force with which the latch pulls in the canvas door. The purpose is to provide equipment.

[Structure of the invention]

The structure of the door lock device of the present invention for achieving the above object includes: a link plate is pivotally supported on a pin provided in a post forming a vertical frame of a canvas door, and a latch for locking the canvas door on the link plate; A linkage for driving the link plate is pivotally supported, and the linkage is attached so as to be movable in the longitudinal direction of the post, and the latch is shaped so as to surround the pin by bending the middle part, and with the tip facing toward the canvas door side. A resilient member is attached to the latch to urge the latch toward the pin side, a striker that engages the latch is attached to the door body provided at the end of the canvas door, and the pivot point of the latch is attached to the door opening portion. The latch is housed in the post, and when locked, the ring plate rotates and the tip of the latch protrudes from the post and engages the striker, and the link plate is further rotated to pull the striker toward the post. be.

〔Example〕

Embodiments of the present invention will be described below based on the accompanying drawings.

1 and 2 show a door lock device D according to the present invention installed in a truck 1, on a hollow corner post 7 in a side opening 5 of a cargo box 3, and on a side frame 11 of a door body 9. Track 1 carried out
and a perspective view of the packing box 3. Also the first
In the figure and FIG. 2, 13 is a canvas door provided between the door bodies 9, 15 is a board provided on the front side X (cab side) of the cargo box 3, 17 is a floor assembly, and 19 is a roof assembly. be. As shown in FIGS. 3 to 5, the door lock mechanism provided in the corner post 7 and the door body 9 includes a latch 21 (having a hook portion at the tip) that can freely extend and retract from the upper and lower sides of the corner post 7. and,
The latch 21 is comprised of a striker 23 (see FIGS. 2 and 5) provided on the side frame 11 of the door body 9, which engages and disengages the latch 21.

The latch 21 is connected to an inner wall surface 2 of a substantially rectangular opening 25 formed on the upper and lower side surfaces of the corner post 7.
A link plate 31 having a substantially U-shaped or U-shaped cross section is connected to a bracket 27 fixed to the bracket 5a via a pin 29a, and is rotatably supported via a pin 29b. That is, each bracket 27 is fixed to the side wall of the corner post 7 with a bolt or the like, and a latch 21 having the same shape as the opening 25 is provided at one end thereof.
Approximately rectangular through holes 33 into which the link plates 31 appear and retract are formed in a mutually overlapping state, and a pin 29a on which the link plate 31 is pivotally supported is installed on the other end side. The tip of a link plate 31 having a U-shaped side surface is rotatably fitted into this pin 29a.
Further, the rear end of the latch 21 is pivoted to a pin 29b installed in the rear end of the link plate 31, and the tips (hooks) of the latches 21 disposed above and below are pivoted so as to face each other. ing.

A torsion coil spring or the like is installed between one side of the bracket 27 and the link plate 31 to bias the link plate 31 (upper side) clockwise (the lower link plate 31 is counterclockwise) using the pin 29a as a fulcrum. An elastic member 35 is interposed, and this elastic member 35 is wound around the pin 29a, and one end is engaged with the bracket 27, and the other end is engaged with a notch 37 formed by looper processing on one side of the link plate 31. It has been stopped.

Also, between the link plate 31 and the rear end of the latch 21, there is an elastic member 39 such as a coil spring that biases the latch 21 against the pin 29b of the link plate 31 counterclockwise on the upper side and clockwise on the lower side. The elastic member 39 is wound around the pin 29b, and one end of the elastic member 39 is locked to the side wall of the link plate 31, and the other end is locked to the side surface of the latch 21 near the rear end.

Next, the ends of linkages 43a and 43b are connected to one side of the upper and lower link plates 31 and 31 via a link mechanism 41 provided at an intermediate position between the upper and lower latch 21 installation portions of the corner post 7, Further, the link mechanism 41 is provided with an operation handle 46.

The operation handle 46 is a known one, for example, a sixth one.
The type shown on the left side of the figure is used. This is composed of a handle whose one end is rotatably supported on a fixed shaft on the side of the corner post 7, and a U-shaped engagement part with each end pin-coupled to the handle. By hooking the mating portion to an engaging pin 63 (to be described later) and rotating the operating handle around the fixed axis, the pin-coupling portion of the engaging portion is moved beyond the so-called dead point with respect to the fixed axis, thereby engaging the pin. This locks the pin 63. In the figure, only a part of this engaging portion is illustrated.

One end of the linkage 43a, 43b is caulked to the side wall of the link plates 31, 31, respectively, and the other end is rotatably connected to both ends of the link 45 of the link mechanism 41.

The link mechanism 41 is rotatably mounted on a bracket 47 attached to the inner wall of the corner post 7, and a plate 49a rising from one end of the bracket 47 has a pin 51 at the center of the first link 45.
The bracket 4 is rotatably supported via the bracket 4.
The plate 49b rising from the other end of 7 has a second
The rear end side of the link 53 is rotatably supported via a pin 55. The end portions of the linkages 43a and 43b are adjustably connected to both ends of the first link 45 via nuts.
Also, one end of the first link 45 and the second link 53
The intermediate link 57 has a pin 59a,
It is rotatably supported via 59b. Note that a spring 61 interposed between a pin 51 (rotation shaft) of the first link 45 and an engagement pin of the second link 53, which will be described later, always biases the second link 53 in the counterclockwise direction. The latch 21 is housed within the corner post 7. Also, 63 is the second
This is an engagement pin provided on the link 53 of the corner post 7, which is located on one side of the corner post 7 (the left side in FIG. protruding from (facing) A through hole is provided on the side surface of the corner post 7 to allow the pin to move up and down. In addition, the same side part is
A recess 70 is formed in which the operating handle is mounted so that the handle portion does not protrude to the side in the locked state. The engagement pin 63 is the link 53
An annular recess is provided protruding to both sides of the spring 61 so that the end of the engaging portion can be easily hooked onto the spring 61.

Further, 65 is a stopper pin for determining the position of the latch 21 when it is retracted (when the lock is released).

Next, the operation of the present invention constructed as described above will be explained.

First, FIGS. 3 and 4 show a state in which the door lock mechanism is released, and in this state the latch 21 is housed in the corner post 7 by the action of the elastic members 35, 37 and 61. Next, when closing the door body 9 and locking the door, the operating handle 4 is engaged with the engagement pin 63 of the second link 53 shown in FIG.
6 in the direction of the arrow (downward direction in the figure) and pull the engaging portion downward, the spring 61
The first link 45 and the second link 53 rotate clockwise about the pins 51 and 55 against the elastic force of the linkages 43a and 43.
Pull b inward (in the direction of the arrows toward each other). When the linkages 43a, 43b are pulled in the direction of the arrow, the link plates 31, 31 rotate in opposite directions using the pin 29a of the bracket 27 as a fulcrum, as shown by the dashed line and the dashed double dot line in FIG. link plate 31,
The latch 21, which is pivotally supported by the pin 29b of
3 and the opening 25 of the corner post 7, and engages with the striker 23 provided on the side frame 11 of the door body 9, and at the same time returns to the corner post 7 side by a stroke S, and locks the door with the door body 9 drawn. It is something to do.

That is, as the pin 29b that pivots the latch 21 moves in the order of loci a, b, and c, the latch 21 also moves sequentially, first protruding to the position indicated by the dashed line,
It will be in a nearly horizontal position. This is because the side ends of each latch 21 are configured to abut against the pins 29a, and further rotation of the latch 21 is prevented. After engaging with the striker 23 at this position, the door body 9 is fixed to the corner post 7 by returning to the position indicated by the two-dot chain line.

The above-mentioned locking operation is performed using the aforementioned operation handle 46.
This is done in conjunction with the lock operation. Therefore, even if the door body 9 is not completely tightened to the corner post 7 (even if there is a gap greater than the stroke S), the door body 9 can be closed. Therefore, it is possible to effectively prevent water, dirt, etc. from entering the packing box 3. To release the door lock mechanism, rotate the operating handle 46 in the direction of the arrow (upward in FIG. 4) and move the engaging part upward in the figure. 53 rotates counterclockwise, and the intermediate link 57
The first link 45 also rotates counterclockwise via the linkage 43a and 43b to push the linkages 43a and 43b away from each other. As a result, the link plate 31 and the latch 21 are connected to the elastic member 31 wound around the pin 29a of the bracket 27, and the link plate 3
The corner post 7 is automatically housed in the corner post 7 by the elastic force of the elastic member 35 wound around the first pin 29b.

In FIG. 6, the latches 21 are arranged outward from each other, the link mechanism 41 is formed into one link plate 71, and the pin 75 is attached to the bracket 73.
It is rotatably supported via. The linkage 43 is attached to both ends of the link plate 71.
A and 43b are connected to each other, and the link plate 71 and latch 21 are biased counterclockwise via a spring 77 so that the link plate 71 and latch 21 are always housed within the corner post 7. Reference numeral 79 denotes an engagement pin fixed to the link plate 71, which corresponds to the engagement pin 63, and is a pin that is fixed to the link plate 71.
It protrudes from the elongated hole 83 of. Reference numeral 85 is an operating handle, and an engaging portion 85a of the operating handle 85 engages with the engaging pin 79 from the side of the corner post 7, so that locking and unlocking operations as described above can be performed. It's summery.

The other configurations are basically the same as in the example described above.

〔Effect of the invention〕

Since the door lock device of the present invention is configured as explained above, the following effects can be obtained.

That is, since the operation of pulling the striker provided on the door body toward the post forming the vertical frame of the canvas door is performed by moving the linkage forming the drive rod along the post, a sufficient stroke can be obtained. The canvas door can be pulled wide enough to create enough tension.

Moreover, since the direction in which the latch is pulled against the elastic member that biases the latch can be the longitudinal direction of the post, a strong force can be generated.
The force that tensions the canvas door can be made strong enough.

Therefore, it is easy to prevent rainwater, wind, dirt, etc. from entering the luggage compartment due to the canvas loosening, and when applied to a vehicle,
By preventing the canvas from flapping, it is possible to prevent or suppress the occurrence of noise, damage to the fabric, etc., and the appearance quality can be improved.

Furthermore, when the door is not locked, the latch can be stored within the vertical frame of the door, eliminating the danger of the worker or the cargo getting caught in the latch when loading or unloading cargo.

Moreover, since the structure is simple, it can be manufactured at low cost and maintenance is also easy.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views of a truck and a cargo box equipped with a door lock device according to the present invention;
4 are a front view and a side view of the door lock mechanism, FIG. 5 is an explanatory view showing the operating state of the door lock mechanism, and FIG. 6 is a perspective view showing a modification of the door lock mechanism. 7... Corner post, 9... Door body, 21...
...Latch, 23...Striker, 25...Opening, 25a...Inner wall surface, 27...Bracket, 2
9a, 29b... pin, 31... link plate, 33... through hole, 35, 39... elastic member,
41...Link mechanism, 43a, 43b...Linkage, 46...Operation handle.

Claims (1)

[Claims] 1 A link plate is pivotally supported on a pin provided in a post that forms the vertical frame of the canvas door, and a latch that locks the canvas door and a linkage that drives the link plate are pivotally supported on the link plate, and the linkage is attached to the post. The latch is attached so as to be movable in the longitudinal direction, and the latch is formed in such a shape that its middle part is bent to surround the pin, and the tip faces toward the canvas door side, and the latch is provided with an elastic force that biases the latch toward the pin side. Attach the member, attach a striker that engages the latch to the door body provided at the end of the canvas door, and set the pivot point of the latch to
When the door is opened, the latch is stored in the post, and when the door is locked, the ring plate rotates and the tip of the latch protrudes from the post and engages the striker.
A door lock device located at a position where the link plate can be further rotated to pull the striker toward the post.