JP2000095008A - Fixture for floor mat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fixture for a floor mat which is installed/removed easily, is hard to fall out and can prevent the deviation of the mat. SOLUTION: An engagingly locking projection 3 of an erection state for a carpet 1 is provided on the carpet 1 laid on a floor surface or a base body 2 installed so as to be in a fixed state for the floor surface. A floor mat 4 is positioned and engagingly locked through the engagingly locking projection 3 into the engagingly locking hole 5 provided on the floor mat 4 laid on the carpet 1. A projection projected to the outer one side of the engagingly locking projection 3 by push-pressing an upper end downward is provided on the upper end projected from the engagingly locking hole of the engagingly locking projection 3 and under the projected state, the engagingly locking projection 3 is constituted so as not to fall out from the engagingly locking hole 5 or hard to fall out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, laying a floor mat (floor carpet mat) to be installed on a carpet laid on the floor of a vehicle so that the floor mat does not shift. The present invention relates to a floor mat fixing device for preventing misalignment.

[0002]

2. Description of the Related Art Conventional fixing devices for floor mats are mounted using a vehicle body such as a main body floor under a carpet or a crossbar below a seat, a seat rail for mounting a seat, and the like. For example, a grommet for screwing is fitted in the mounting recess of the vehicle body and screwed and fastened via this grommet, or it is attached to the seat rail by screwing via a mounting bracket. All of the floor mat fixtures are fixed to the carpet by being attached to the floor in this manner.
Further, a locking projection (locking pin) for preventing displacement is simply provided.

That is, a locking pin provided on a later-installed floor mat laid on a carpet is fitted through a locking pin for preventing positional deviation protruding from a substrate mounted on the carpet, and the floor mat is positioned. The configuration was such that it could be laid so as not to shift.

[0004]

However, as described above, the conventional fixing device for floor mats merely has a structure in which pin-shaped locking projections (locking pins) are erected, and the floor mat is simple. Although the upper end (head) of the locking projection is slightly bulged to prevent the floor mat from coming off, the floor mat may come off.

[0005] That is, even if a protruding head is provided on the head of the locking pin, play is made when the diameter of the locking pin is slightly smaller than the inner diameter of the locking hole so that the floor mat can be easily attached and detached. Clearance) ensures that the floor mat can be pulled out even if it is inclined with respect to the locking pin. In many cases, a force for pushing back is applied, and in particular, the floor mat below the driver's seat may be lifted by an accelerator operation or a brake operation. The hole may come off.

This is not a concern if the locking pin has a sufficient penetrating projection length for this lifting, but if the locking pin protrudes too much from the floor mat, it becomes an obstacle or impairs the appearance. . Also, as described above, the outer diameter of the bulging head at the upper end of the locking pin is matched with the inner diameter of the locking hole. If the locking hole edge is hooked on the
Although this detachment can be prevented, it is necessary to ensure a sufficient play (penetration clearance) between the bulging head and the locking hole so that the mat can be easily attached and detached.

In view of the above situation, the present invention makes it possible to easily insert and pass through the locking hole, easily attach and detach the mat, and prevent the mat from being displaced by improving the locking pin. It is possible to provide an extremely innovative floor mat fixing device which can surely exhibit its function, can effectively prevent the mat from coming off even when the mat is lifted up, and is hard to come off as compared with the conventional example. It is an object.

[0008]

The gist of the present invention will be described with reference to the accompanying drawings.

On a carpet 1 laid on the floor surface or on a base 2 attached to the floor surface so as to be fixed, a locking projection 3 is provided projecting from the carpet 1 so as to stand upright. A fixing device for a floor mat for positioning and locking the floor mat 4 by projecting the locking projection 3 through a locking hole 5 provided in a floor mat 4 laid on the carpet 1; At the upper end of the locking projection 3 protruding from the locking hole 5, a projection 6 is provided which presses the upper end downward to at least protrude outwardly of the locking projection 3. A fixing member for floor mats, wherein the projecting portion 6 prevents the engaging projecting portion 3 from coming out of the engaging hole 5 or making it hard to come off when the projecting portion 6 projects. It is.

Further, the projecting portion 6 is configured such that an outer peripheral surface forming portion of the engaging projecting portion 3 projects outward by pressing an upper end portion of the engaging projecting portion 3 downward. The fixing device for a floor mat according to claim 1.

A pressing head 3A is provided at the upper end of the locking projection 3 so that when the pressing head 3A is pressed downward, the entire length of the locking projection 3 is shortened. In addition, an outer projection 6A is provided below the pressing head 3A and bulges outward when the pressing head 3A is pressed downward to constitute the projecting part 6. Terms 1, 2
The floor mat fixing device according to any one of the above.

Further, an upper portion of the locking projection 3 is formed in a hollow shape, and an allowable space portion 7 is provided for allowing the downward movement of the pressing head 3A. A plurality of cuts 8 are formed on the side surface of the upper end of the locking projection 3 to be bent, and the cut-away piece 9 between the cuts 8 bends outward when the pressing head 3A is pressed downward. The fixing device for a floor mat according to claim 3, wherein the protruding portion (6) is configured to be the bulging outer surface protruding portion (6A).

A holding mechanism (10) is provided at an upper end of the locking projection (3) for locking and holding the projection (6) in a state of protruding outward. 2. A fixing device for a floor mat according to item 1.

The pressing head 3A is provided with a locking portion 11 disposed in the allowable space portion 7, and the pressing portion 3A
An engaging portion 12 for locking the engaging portion 11 is provided in the allowable space portion 7, and when the pressing head 3 </ b> A is pressed downward, the locking portion 11 is locked on the engaging portion 12, and 6. The fixing device for a floor mat according to claim 5, wherein the holding mechanism is configured so as to lock and hold an outwardly protruding state of the floor mat.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention (how to implement the invention) will be briefly described with reference to the drawings, showing the operational effects thereof.

For example, as shown in FIG. 1, a base 2 is attached and fixed to a carpet 1, and a pin-shaped locking projection 3 is arranged on the carpet 1 in an upright state.

The floor mat 4 is laid on the carpet 1 so as to be positioned by penetrating through the locking hole 5 of the floor mat 4 to be attached to the locking projection 3 later.

Therefore, even if a force is applied to the floor mat 4 in the front-rear and left-right directions, since the locking holes 5 are fitted on the locking projections 3, the positions do not shift even if there is some shift due to play.

Further, according to the present invention, at least one of the upper ends of the locking projections 3 protruding from the locking holes 5 is pressed downward to at least make the outer side of the locking projections 3 As long as the protrusion 6 protrudes toward the one side and the protrusion 6 does not sink, the outer diameter of the locking protrusion 3 is large due to the protrusion 6 and the locking protrusion 3 does not come off from the locking hole 5 or hardly comes off. .

That is, if the locking projection 3 is not inclined with respect to the floor mat 4, it is detached but is not detached when it is inclined. It is also possible to adopt a configuration in which the projection 6 does not come out at all regardless of the inclined state, regardless of the inclined state. However, in order to easily understand the present invention, as shown in FIG. Even in the latter case, the outer diameter of the locking projection 3 including the projection 6 is set to be larger than the inner diameter of the locking hole 5, and whether or not the projection 6 is locked. The upper end of the projection 3 is returned to its original position above, so that the degree of protrusion is reduced or the locking hole 5 is kept unless the degree of protrusion is eliminated.
Is assumed to be impossible to pass through, and this case will be described below as an example.

In the present invention, when the projection 6 (the upper end of the locking projection 3) is passed through the locking hole 5 at the time of attachment,
The protrusion 6 does not protrude outward from the locking protrusion 3.
This is performed in a state where the outer diameter of the upper end of the locking projection 3 including the above is reduced. Then, the upper end of the locking projection 3 is inserted through the locking hole 5,
When the upper end of the locking projection 3 is pressed downward, the projection 6
Is projected outward, the upper end of the locking projection 3 is returned to the original position again, even if it is inclined, and the projection 6
It will not be able to come out unless the is sunk.

If the projecting portion 6 is configured so that the outer peripheral surface forming portion of the engaging projection 3 projects outward by pressing the upper end of the engaging projection 3 downward, one position In addition, since the outer peripheral surface forming portion protrudes in multiple directions to increase the outer diameter, it is more difficult to come off.

Therefore, the floor mat 4 is attached by a so-called one-touch operation (one behavior) simply by inserting the locking projection 3 into the locking hole 5 and pressing the upper end of the locking projection 3 downward. It can be done (when removing, the locking projection 3
Is pulled up upward to return the protruding portion 6 to the sunk state and to pass through the locking hole 5).

On the other hand, in the drawing, the locking projection 3 is
In the conventional example, after the floor mat 4 is attached, if the floor mat 4 is lifted by an operation of a front accelerator pedal or a brake pedal, the locking projection is provided in the conventional example. Even if the floor mat 4 is inclined with respect to the portion 3, the locking holes 5 of the floor mat 4 are originally provided.
The outer diameter of the head of the locking projection 3 is set slightly smaller than the inner diameter of the locking projection 3 so that the floor mat 4 can be easily attached and removed, and a clearance for insertion is provided. May easily come off. That is, when the floor mat 4 rises, even if the locking projection 3
On the other hand, even if the locking hole 5 of the floor mat 4 is inclined, it may slip through and come off.

In this regard, as shown in FIG. 3, the present invention mounts the projecting portion 6 through the locking hole 5 by setting the projecting portion 6 in a submerged state as described above. It does not come off from the locking hole 5.

Therefore, attachment and detachment are easy, and the locking projections 3 are less likely to come off from the locking holes 5 of the floor mat 4.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described with reference to the drawings.

In this embodiment, a resin is integrally molded.
A plate-like base body 2 directly attached to the vehicle body so as to be fixed to a carpet 1 laid on the floor surface,
A pin-shaped elongate locking projection 3 disposed vertically with respect to the carpet 1 is vertically provided to protrude from the carpet 1.
So-called retrofitted floor carpet mat 4 laid on top
(Hereinafter, simply referred to as a mat 4), the locking protrusion 3 is penetrated and protruded from a locking hole 5 provided with a ring fitting.
Are positioned and locked.

The locking projection 3 is made slightly smaller than the inner diameter of the locking hole 5 so that a penetration clearance for facilitating insertion and removal from the locking hole 5 and easy attachment and detachment of the mat 4 is generated. When the protrusion 6 described later protrudes, the outer diameter including the protrusion 6 is larger than the inner diameter of the locking hole 5, so that the protrusion 6 does not come out of the locking hole 5 unless the protrusion 6 sinks. The lock pin is set to.

The height of the pressing head 3A of the locking projection 3 is equal to or slightly larger than the height of the locking hole 5 so that the locking projection 3 is hardly removed.

In this embodiment, the pressing head 3A projecting from the locking hole 5 of the locking projection 3 is provided with the pressing head 3A.
When the projection 6 is pressed downward, a projection 6 is provided which projects outward from the locking projection 3. When the projection 6 is projected, the projection 6 causes the locking projection 3 to lock the locking hole. 5 does not come off.

More specifically, in this embodiment,
A pressing head 3A is provided at the upper end of the locking projection 3 so that when the pressing head 3A is pressed downward, the entire length of the locking projection 3 is shortened. Head 3
An outer projecting portion 6A that bulges outward when the pressing head 3A is pressed downward at the lower portion of A constitutes the projecting portion 6.

More specifically, the locking projection 3 is made of a flexible resin which is not easily broken even when bent. An upper portion of the locking projection 3 is formed in a hollow shape, and an allowable space portion 7 is provided for allowing the downward movement of the pressing head 3A. A plurality of vertically elongated cut portions 8 are formed on the side surface of the upper end of the portion 3, and the uncut pieces 9 between the cut portions 8 form the pressing head 3 </ b> A.
The protrusion 6 is configured to be the outer protrusion 6A which bends and bulges outward when the is pressed downward.

Further, a holding mechanism 10 for locking and holding the protruding portion 6 in a state of protruding outward is provided at the upper end of the locking protruding portion 3.

More specifically, a pin-shaped locking portion 11 provided in the permissible space 7 is provided below the pressing head 3A, and an engaging portion for locking the locking portion 11 is provided. An insertion hole as the part 12 is provided on the upper surface of the main body part in contact with the lower space part of the allowable space part 7, and the locking part 11 is locked to the engaging part 12 when the pressing head 3A is pressed downward. Thus, the state in which the protruding portion 6 protrudes outward is locked and held.

That is, in this embodiment, the pressing head 3A
With the one-touch operation of pressing downward, the remaining uncut pieces 9 are bent so as to protrude outward from the locking projections 3 to form the outer surface protruding portions 6A, and at the same time, the locking portions 11 The outer surface protruding portion 6A is configured to be retained by being inserted into and locked to the outer surface protruding portion 6A. Further, the locking by the holding mechanism 10 is configured so that the locking can be released by applying a force to move the pressing head 3A upward, and the pressing head 3A is moved upward to return to the original position. If it is returned, the protruding portion 6 will sink and the locking hole 5
Is configured to be able to pass through. In the drawing, a hook groove 13 is formed on the peripheral side surface of the pressing head 3A,
A finger or a nail is hung on the hook groove 13 so that the upward movement operation of the pressing head 3A can be easily performed.

Therefore, in this embodiment, the pressing head 3A is configured to be slidable from a state in which the protrusion 6 has a degree of protrusion that cannot pass through the locking hole 5 to a state in which the degree of protrusion can pass through. ing.

That is, in the present embodiment, the configuration is such that the amount of protrusion of the outer surface protruding portion 6A can be changed (adjustable and settable) by setting the configuration condition of the capacity of the permissible space portion 7; A configuration in which the pressing resistance downwardly of the pressing head 3A can be changed by selecting a component (a configuration that can be adjusted and set).
And

Therefore, in the present invention, for example, the locking projection 3 is detached if it is not inclined with respect to the mat 4, but is set to such a size that it cannot be detached by the projection 6 only in the inclined state, so that it is difficult to detach. It is also possible to adopt a configuration in which the projection 6 does not come out at all regardless of the inclined state, regardless of the inclined state. However, in the present embodiment, the latter case is adopted, and as shown in FIG. The outer diameter of the locking projection 3 including the projection 6 is set larger than the inner diameter of the locking hole 5 regardless of whether or not the projection 6 is pressed. It is configured so that it cannot pass through the locking hole 5 unless it is lost.

Therefore, when the projecting portion 6 is passed through the locking hole 5 at the time of attachment, the projecting portion 6 does not press the pressing head 3A downward and the projecting portion 6 does not protrude outward from the locking projecting portion 3. 6 is performed in a state where the outer diameter of the upper end of the locking projection 3 including the outer diameter 6 is reduced. When the upper end of the locking projection 3 is inserted through the locking hole 5 and the upper end of the locking projection 3 is pressed downward, the projection 6 projects outward. If it does not come out, it will not come off unless the pressing head 3A of the locking projection 3 is returned to the original position again and the projection 6 is in a state of being sunk.

Further, since the projecting portion 6 is configured so that the outer peripheral surface forming portion of the locking projection 3 projects outward by pressing the upper end portion of the locking projection 3 downward, only one location is provided. In addition, since the outer peripheral surface forming portion protrudes in multiple directions to increase the outer diameter, it is more difficult to come off.

Accordingly, the floor mat 4 is attached by a so-called one-touch operation (one behavior) simply by inserting the locking projection 3 into the locking hole 5 and pressing the upper end of the locking projection 3 downward. It can be done (when removing, the locking projection 3
Is pulled up upward to return the protruding portion 6 to the sunk state and to pass through the locking hole 5).

On the other hand, in the drawing, the locking projection 3 is
In the conventional example, after the floor mat 4 is attached, if the floor mat 4 is lifted by an operation of a front accelerator pedal or a brake pedal, the locking projection is provided in the conventional example. Even if the floor mat 4 is inclined with respect to the portion 3, the locking holes 5 of the floor mat 4 are originally provided.
The outer diameter of the head of the locking projection 3 is set slightly smaller than the inner diameter of the locking projection 3 so that the floor mat 4 can be easily attached and removed, and a clearance for insertion is provided. May easily come off. That is, when the floor mat 4 rises, even if the locking projection 3
On the other hand, even if the locking hole 5 of the floor mat 4 is inclined, it may slip through and come off.

However, in this embodiment, as shown in FIG. 3 as described above, the floor mat 4 is attached by passing through the locking hole 5 by setting the protruding portion 6 in the sunk state as described above. It does not come off from the locking hole 5 even when it floats up.

Therefore, the attachment and detachment are easy, and the locking projection 3 is less likely to come off from the locking hole 5 of the floor mat 4.

The structure and mounting structure of the base 2 of the present embodiment will be described. In the present embodiment, the mounting is performed by using the vehicle body as in the prior art, that is, the mounting simply formed on the base 2 on the vehicle body. Locking fitting part 16 that press fits into the recess
The figure shows a case in which a protruding configuration is adopted.
A configuration using 14 seat rails may be used, or a configuration in which the seat rail is directly locked and fixed to the carpet 1 may be used.

For example, as shown in FIG. 5, the base 2 referred to in the present embodiment is attached to the carpet 1 from the mounting hole 17 or the cutout 17 formed in the carpet 1 by directly engaging and fixing the carpet 1. A rear side sandwiching portion 18 inserted and disposed on the back side of the carpet 1; and a front side clamping portion 19 disposed on the front side of the carpet 1 so as to face the rear side clamping portion 18. The carpet 1 is sandwiched from above and below by the sandwiching portion 19, and the base 2 is directly locked and fixed on the carpet 1.

More specifically, with reference to the drawings, the base 2 is integrally formed of resin, and the back side holding portion 18 and the front side holding portion 19 are configured to be rotatable via a hinge portion 20.
The carpet 1 is pinched between the back side holding portion 18 and the front side holding portion 19 by rotating through the
It is configured to be locked and fixed to.

More specifically, as shown in FIGS. 5 and 6, the locking projection 3 is provided upright on a plate-like back side holding portion 18, and one side of the back side holding portion 18 is provided. A plate-shaped front side holding portion 19 is continuously provided via a hinge portion 20, and the front side holding portion 19 is provided.
Has an escape groove 21 for escaping the locking projection 3.

Therefore, for example, a notch 17 having a predetermined width for inserting the backside holding portion 18 and a notch 17 for moving the locking projection 3 are combined to form a T-shaped notch 17.
Is formed on the back side of the carpet 1 while inserting the back side holding portion 18 from the cutout portion 17, and then rotated so as to overlap the front side holding portion 19 on the back side holding portion 18 via the hinge portion 20. The carpet 1 with the back side holding section 18 and the front side holding section 19
Is pinched and locked.

Further, in this embodiment, the back side holding portion 18 is provided.
A pinching lock mechanism 22 is provided to lock and hold a state in which the carpet 1 is strongly pinched in a pressing state from above and below by the front side pinching portion 19.

More specifically, the back-side holding portion 18 and the front-side holding portion are provided at the base of the locking projection 3 and the escape groove 21 of the front-side holding portion 19.
19 is provided with a locking structure for locking and locking a state where the carpet 1 is strongly sandwiched and overlapped.

Various specific structures can be conceived for directly locking and fixing to the carpet 1, but with the above structure, there is no need to provide any mounting structure on the vehicle body side, and the manufacture is easy. It is easy to install, has excellent mass productivity and can reduce cost.Because it does not work on the body side, it has a mounting structure that does not cause any problems such as vibration and rust.
In addition, simply by making a cut in an arbitrary position of the carpet 1 or providing a mounting hole, the mounting position can be freely positioned and securely mounted, and the mounting work is easy and the work efficiency is improved.

When a structure in which the carpet 1 is directly locked and fixed is adopted, the carpet 1 is fixed in order to minimize the amount of movement (inclination) of the locking projection 3 caused by the floating of the carpet 1. It is preferable that the seat portion 14 is locked and fixed in the vicinity of a fixing position 15 (mounting bolt) of the seat rail of the seat portion 14, and it is particularly desirable that the position P is slightly forward of the fixing position 15. Therefore, as shown in FIG. 7, by locking and fixing the base 2 slightly forward P of the seat rail mounting fixing position 15, the amount of movement of the locking projection 3 due to the floating of the carpet 1 is small, and the floor mat 4 is positioned. It is difficult to shift.

[0055]

Since the present invention is constructed as described above, by improving the locking projections, the locking projections can be easily fitted and inserted into the locking holes of the floor mat for easy mounting and removal. This is an extremely innovative floor mat that can reliably prevent the mat from slipping off even when the floor mat is lifted up. Fixture.

That is, at least one side of the upper end portion of the locking projection that protrudes from the locking hole is pressed downward to at least protrude to the outer side of the locking projection. As long as the projection is not submerged, the outer diameter of the locking projection is large by this projection, so that it does not come off from the locking hole or is hard to come off.
At the time of installation, projecting part into the locking hole (upper end of the locking projection)
Is carried out in such a state that the outer diameter of the upper end of the locking projection including this projection is reduced without pressing the upper end of the locking projection. And insert the upper end of the locking projection into the locking hole,
The protrusion protrudes outward just by pressing the upper end of the locking projection downward, so that the floor mat can be easily attached and the upper end of the locking projection is returned to the original position. As long as the floor mat is not returned to the state where the protruding portion is submerged, the floor mat can be easily removed even if the floor mat is lifted up.

If the degree of protrusion of the protruding portion is set to be large, it is possible to cope with locking holes having various hole diameters, so that a floor mat fixing device having an excellent structure can be obtained.

According to the second aspect of the present invention, not only one of the upper end portions of the locking projections but also the outer peripheral surface forming portion protrudes in multiple directions to increase the outer diameter of the projection. It is an epoch-making floor mat fixing device which is hard to come off and can prevent the mat from coming off more effectively.

According to the third aspect of the present invention, a revolutionary structure excellent in practicality that can easily realize a projecting portion structure that projects by pressing the upper end portion of the locking projecting portion with a simple configuration. It becomes a fixture for floor mats.

Further, according to the fourth aspect of the present invention, it is possible to easily realize a protruding and retracting structure of the protruding portion by pressing the upper end of the locking protruding portion with a simpler structure, and furthermore, it is possible to form the allowable space portion. By this setting, it is possible to set the protrusion amount of the protrusion and the pressing adjustment such as the pressing resistance appropriately according to the material and the structural condition of the resin.

According to the fifth aspect of the present invention, since the projected state of the projection is locked and held by the holding mechanism at the time of mounting, the projection is arbitrarily depressed and the mat cannot be prevented from coming off. It is possible to provide a floor mat fixing device in which the function and effect of preventing the detachment from being easily removed can be more reliably and satisfactorily exhibited.

In the invention according to the sixth aspect, the holding mechanism can be realized with a simple structure, and the upper end (the pressing head) of the locking projection is pressed downward, so that the projection is projected. Since the state is maintained, the mat can be mounted while maintaining the protruding state of the protruding portion by a so-called one-touch operation (one behavior).

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view showing a use state of the present embodiment.

FIG. 2 is a schematic configuration perspective view of the present embodiment.

FIG. 3 is an explanatory view of a main part showing a state in which the mat of the present embodiment is inserted into a locking projection.

FIG. 4 is a schematic cross-sectional view of a main part showing a mat mounting state of the embodiment.

FIG. 5 is an explanatory perspective view showing an example of a base having a configuration in which it is directly locked and fixed to a carpet in the present embodiment, before mounting and fixing;

FIG. 6 is an explanatory sectional view showing a fixed state of the base body of FIG. 5;

FIG. 7 is an explanatory view showing an appropriate attachment portion to the carpet in a case where the base according to the present embodiment is configured to be directly locked and fixed to the carpet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Carpet 2 Substrate 3 Locking projection 3A Pressing head 4 Floor mat 5 Locking hole 6 Projection 6A Outer surface projection 7 Allowable space 8 Notch 9 Remaining piece 10 Holding mechanism 11 Locking part 12 Engagement Department

Claims (6)

[Claims] 1. A carpet laid on a floor surface or a base attached to be fixed to a floor surface, wherein a locking projection is provided protruding from the carpet so as to be erected on the carpet. A floor mat fixture for positioning and locking the floor mat by penetrating and projecting the locking projection into a locking hole provided in a floor mat laid on a carpet,
An upper end portion of the locking protrusion that protrudes from the locking hole is provided with a protruding portion that presses the upper end portion downward so as to protrude at least to one outer side of the locking protrusion. The fixing device for a floor mat, wherein the locking projection is prevented from coming off from the locking hole or hard to come off from the locking hole by the projection. 2. The projection according to claim 1, wherein an outer peripheral surface forming portion of the locking projection projects outward by pressing an upper end of the locking projection downward. Item 2. The fixing device for floor mat according to Item 1. 3. A pressing head is provided at an upper end of the locking projection, and when the pressing head is pressed downward, the entire length of the locking projection is shortened. 4. The protruding portion according to claim 1, wherein an outer surface protruding portion that bulges outward when the pressing head is pressed downward is provided at a lower portion of the pressing head. A fixing device for a floor mat according to the item. 4. An upper portion of the locking projection is formed in a hollow shape to provide a permissible space portion which allows a downward press movement of the pressing head, and a locking portion outside the permissible space portion. A plurality of cuts are formed on the side surface of the upper end of the protrusion, and the uncut portion between the cuts serves as the outer surface protrusion that bends and bulges outward when the pressing head is pressed downward. The floor mat fixing device according to claim 3, wherein the projecting portion is configured as described above. 5. A locking mechanism according to claim 1, wherein a holding mechanism for locking and holding said projecting portion in a state of projecting outward is provided at an upper end portion of said locking projecting portion. The fixing device for the floor mat according to the above. 6. The pressing head is provided with a locking portion disposed in the allowable space portion, an engaging portion for locking the locking portion is provided in the allowable space portion, and the pressing head is provided with The holding mechanism is configured such that when pressed downward, the locking portion is locked to the engaging portion, and the state in which the protruding portion protrudes outward is locked and held. Item 6. A fixing device for a floor mat according to Item 5.