Commodity display board

Information

  • Patent Grant
  • 6527129
  • Patent Number
    6,527,129
  • Date Filed
    Wednesday, May 30, 2001
    23 years ago
  • Date Issued
    Tuesday, March 4, 2003
    21 years ago
  • Inventors
  • Original Assignees
  • Examiners
    • Chin-Shue; Alvin
    • Purol; Sarah
    Agents
    • Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Abstract
A commodity display board including a rectangular, flat board main body having a predetermined surface area necessary to display commodities. Many slit-like engagement holes each having a predetermined length are formed on an entire top surface of the board main body in a matrix at predetermined intervals in longitudinal and lateral directions of the board.
Description




TECHNICAL FIELD OF THE INVENTION




The present invention relates to a commodity display board used when displaying commodities such as vegetables and fruits on a cooling case, a wagon or the like. More particularly, the present invention relates to a commodity display board which can be used as a base plate (or grating), a backplate, an inclined plate or the like to display commodities and with which display equipment such as rolling stoppers and partitions can be assembled.




BACKGROUND ART




In displaying round commodities such as oranges and apples, long commodities such as green onions and burdocks, leaf and stem commodities such as spinaches and leaf lettuces on a vegetable and fruit cooling case, a wagon or the like in a supermarket or the like, a base plate (or shelf plate) is attached to a display frame constituting the cooling case, the wagon or the like and commodities are put on the base plate to thereby display the commodities, a partition plate is provided on a base plate to thereby display the commodities in order on the base plate according to types, or a base plate itself is obliquely attached to a frame or a volume-up member called a filling is disposed on a base plate and leaf and stem commodities are displayed to be rested so as to add volume to displayed commodities and to make commodities appear attractive. By doing so, commodities are displayed beautifully and effectively to grow the buying power of consumers.




However, the base plate used for conventional commodity display is formed to have a dedicated shape and a dedicated size to conform to the display frame constituting the cooling case, the wagon or the like. Due to this, if the display frame is changed in shape or different frames are used, it is required to prepare various types of base plates different in shape and size accordingly, thereby disadvantageously pushing up cost. Furthermore, the base plate for the conventional commodity display is provided on the premise that commodities are put on and displayed the base plate. Due to this, the form of the base plate to be used is disadvantageously limited. For example, it is impossible to arrange the base plate vertically, to attach a commodity mounting plate in front of the base plate to thereby mount and display commodities thereon or to arrange the base plate obliquely to display commodities such as oranges by stages, thus lacking in flexibility.




DISCLOSURE




The present invention has been made to solve the above-stated disadvantages. It is, therefore, an object of the present invention to provide a commodity display board which can be applied to various forms to be used according to the manner in which commodities are displayed, into which display equipment such as rolling stoppers, partitions and the like can be assembled, on which less dust remains and which is good in air permeability.




To obtain the above object, the present invention is a commodity display board for displaying commodities, characterized by comprising a flat board main body having a predetermined surface area necessary to display the commodities, and characterized in that many engagement holes for attaching display equipment and permeating air are formed on an entire region of a top surface of the board main body at predetermined intervals.




Also, the present invention is characterized in that the engagement holes are slits each having a predetermined length, and the slit-like engagement holes are arranged in a matrix on the top surface of the board main body.




Further, the present invention is characterized in that the engagement holes are formed out of slit-like grooves extending over the enter length of one edge of the board main body, and the slit-like grooves are arranged parallel to one another in large number at predetermined intervals in a direction of the other edge of the board main body.




Furthermore, the present invention is characterized in that the slit-like engagement holes are penetrated into a rear surface of the board main body, and the slit-like engagement holes are formed to be gradually enlarged from the top surface of the board main body toward the rear surface of the board main body.




Moreover, the present invention is characterized in that a width of each of the slit-like grooves is gradually increased from the top surface of the board main body toward the rear surface of the board main body, and a bottom of each of the slit-like grooves is opened to the rear surface while being partially left.




Furthermore, the present invention is characterized in that the display equipment are rolling stopper plates, partition plates, and mounting plates for the commodities displayed on the board main body, the display equipment are held to the board main body by being engaged with the engagement holes, respectively, and constituted to be able to partition the top surface of the board main body into a plurality of regions in accordance with the displayed commodities.




Additionally, the present invention is characterized in that a rib guiding the display equipment is formed on one of an inner wall surface of each of the slit-like engagement holes and an inner wall surface of each of the slit-like grooves.




Further, the present invention is characterized in that coupling mechanisms coupling the adjacent board main bodies to each other are provided at least longitudinal or lateral both ends of the board main bodies so that the top surfaces of the adjacent board main bodies are coincident with each other.




According to the present invention, the commodity display board consists of a flat board main body having a predetermined surface area necessary to display commodities. Due to this, the board main body can be used as the base plate, the back plate, the inclined plate or the like of a cooling case, a wagon or the like to display commodities. Thus, the flexibility of the board main body enhances and the commodity display board can be applied to various modes of use in accordance with the manner in which the commodities are displayed.




Further, according to the present invention, engagement holes are formed on the entire top surface of the board main body at predetermined intervals. Due to this, partition plates or rolling stopper plates can be attached to the board main body using the engagement holes. As a result, the top surface of the board main body can be partitioned in accordance with displayed commodities, the board main body can be changed to various modes of use in accordance with the manner in which the commodities are displayed and the good air permeability of the board main body per se can be ensured.




Moreover, according to the present invention, the engagement holes are formed out of slit-like holes or slit-like grooves and the engagement holes are formed to be gradually enlarged from the top surface of the board main body toward the rear surface thereof. Thus, it is possible to prevent the engagement holes from getting clogged with dust and to easily clean the engagement holes.




Additionally, according to the present invention, adjacent board main bodies are coupled to each other using the coupling mechanisms of the board main bodies. Thus, the area of the commodity display board can be increased longitudinally and laterally, accordingly, the area of the commodity display board can be changed in accordance with the manner in which the commodities are displayed.











BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

is a perspective view of a commodity display board in the first embodiment according to the present invention;





FIG. 2

is an enlarged sectional view taken along line A—A of FIG.


1


and showing one example of an engagement hole portion;




FIG


3


is an enlarged sectional view showing another example of an engagement hole portion according to the present invention;





FIG. 4

is an enlarged sectional view showing yet another example of an engagement hole portion according to the present invention;





FIG. 5

is a perspective view showing display equipment showing an example as to how the commodity display board is used and showing a state in which the display equipment are assembled with a board main body in the first embodiment according to the present invention;





FIG. 6

is a perspective view showing display equipment showing another example as to how the commodity display board is used and showing a state in which the display equipment are assembled with the board main body in the first embodiment according to the present invention;





FIG. 7

is a perspective view of a commodity display board in the second embodiment according to the present invention;





FIG. 8

is a perspective view of the partially notched commodity display board in the second embodiment according to the present invention;





FIG. 9

is a partially notched, perspective view showing a modification of the commodity display board in the second embodiment according to the present invention;





FIG. 10

is an enlarged sectional view showing the important parts of

FIG. 9

;





FIG. 11

is a perspective view showing display equipment showing an example as to how the commodity display board is used and showing a state in which the display equipment are assembled with a board main body in the second embodiment according to the present invention;





FIG. 12

is a perspective view showing display equipment showing another example as to how the commodity display board is used and showing a state in which the display equipment are assembled with the board main body in the second embodiment according to the present invention;





FIG. 13

is a perspective view showing display equipment showing yet another example as to how the commodity display board is used and showing a state in which the display equipment are assembled with the board main body in the second embodiment according to the present invention;





FIG. 14

is a perspective view of a commodity display board in the third embodiment according to the present invention;





FIG. 15

is an enlarged perspective view of a coupling mechanism on a portion B of

FIG. 14

; and





FIG. 16

is an enlarged perspective view of a coupling portion on a portion C of FIG.


14


.











DETAILED DESCRIPTION OF THE INVENTION




The embodiments of the present invention will be described hereinafter with reference to

FIGS. 1

to


16


.




First, the first embodiment of the present invention will be described with reference to

FIGS. 1

to


6


. In

FIG. 1

, a commodity display board


10


comprises a rectangular, flat synthetic resin board main body


101


having a predetermined surface area necessary to display commodities. In the main body


101


, many slit-like engagement holes


102


each having a predetermined length are formed on the entire top surface of the board main body


101


in a matrix in the vertical and horizontal directions of the board main body


101


at predetermined intervals. These slit-like engagement holes


102


are constituted to impart an air permeability function to the board main body


101


and to allow display equipment


11


shown in

FIGS. 2

to


4


to be detachably inserted into the holes


102


.




In addition, the slit-like engagement holes


102


are slit-like long holes constituted to be penetrated from the top surface (or front surface) of the board main body


101


to the rear surface thereof as shown in FIG.


2


. In the slit-like engagement holes


102


, the top surface-side openings


102


A of the board main body


101


are formed at intervals A each corresponding to the thickness of a display equipment


11


and intervals B each gradually enlarged in a generally inverse V shape manner from the top surface-side opening


102


A toward the rear surface of the board main body


101


. By thus forming the slit-like engagement holes


102


, it is possible to prevent dust from being collected or clogged in the engagement holes


102


and to easily clean the engagement holes


102


.





FIG. 3

shows a modification of the slit-like engagement holes


102


. In

FIG. 3

, the board main body top surface-side openings


102


A of the slit-like engagement holes


102


are slit-like long holes formed at intervals A each corresponding to the thickness of the display equipment


11


and cavities


103


are formed at intervals B sufficiently wider than the intervals A of the top surface-side openings


102


A on portions from the vicinity of the lower portions of the top surface-side openings


102


A toward the rear surface of the board main body


101


.




In this modification, the same function and advantage as those of the slit-like engagement holes


102


shown in

FIG. 2

are obtained.





FIG. 4

is another modification of the slit-like engagement holes


102


. In

FIG. 4

, the board main body top surface-side openings


102


A of the slit-like engagement holes


102


are slit-like long holes formed at intervals A each corresponding to the thickness of the display equipment


11


and one of the side surfaces


102


B opposite each other on a portion from the vicinity of the lower portion of each top surface-side opening


102


A to the rear surface of the board main body


101


is cut obliquely to thereby form a cavity


104


larger in area than the top surface-side opening


102


A.




In this another modification, the same function and advantage as those of the slit-like engagement holes


102


shown in

FIG. 2

are obtained.




Next, an example as to how the commodity display board


10


in the first embodiment of the present invention is used will be described with reference to FIG.


5


. The display equipment shown in FIG.


5


(A) constitutes a strap-like rolling stopper


111


made of a transparent acrylic material or the like having a length corresponding to the longer length dimension of the board main body


101


shown in FIG.


5


(B). Many engagement pieces


111


A detachably inserted into the respective slit-like engagement holes


102


arranged in the longer length direction of the board main body


101


are formed on the lower edge of each rolling stopper plate


111


in the longer length direction of the rolling stopper plate


111


at the same intervals as those of the slit-like engagement holes


102


.




The rolling stopper plate


111


is attached vertically to the board main body


101


by inserting the engagement pieces


111


A into the respective slit-like engagement holes


102


arranged in the longer length direction of the board main body


101


as shown in FIG.


5


(B).




If commodities such as vegetables and fruits are displayed on the commodity display board


10


while the board


10


is inclined at a predetermined angle θ with respect to a horizontal plane, a plurality of rolling stopper plates


111


are attached to the board main body


101


at predetermined intervals and the commodities are put on the board main body


101


located on the upper surface sides of the rolling stopper plates


111


as shown in FIG.


5


(B). By doing so, it is possible to display the commodities on the inclined commodity display board


10


without dropping the commodities. In this case, commodities can be displayed with apparently increased volume.




Next, another example as to how the commodity display board


10


in the first embodiment of the present invention is used will be described with reference to FIG.


6


. The commodity equipment shown in FIG.


6


(A) constitutes a rolling stopper plate


112


made of a transparent acrylic material or the like having a length corresponding to the longer length dimension of the board main body


101


shown in FIG.


6


(B) or a length corresponding to half the longer length dimension of the board main body


101


. The rolling stopper plate


112


is bent into a generally V shape to thereby form a horizontal commodity mounting piece


112


A and a support piece


112


B. Many engagement pieces


112


C detachably inserted into the respective slit-like engagement holes


102


arranged in the longer length direction of the board main body


101


are formed on the lower edge of the support piece


112


B in the longer length direction of the rolling stopper plate


112


at the same intervals as those of the slit-like engagement holes


102


.




The rolling stopper plate


112


is attached to the board main body


101


as shown in FIG.


6


(B) by inserting the engagement pieces


112


C into the respective slit-like engagement holes


102


arranged in the longer length direction of the board main body


101


. At this moment, the lower edge of the commodity mounting piece


112


A is held to come in contact with the top surface of the board main body


101


. If commodities such as vegetables and fruits are displayed on the commodity display board


10


while the board


10


is inclined at a predetermine angle θ with respect to a horizontal plane, the long rolling stopper plates


112


are attached to the lowest end portion of the board main body


101


, the board main body


101


is halved laterally and a plurality of short rolling stopper plates


112


are attached to the respective halved regions of the board main body


101


in parallel at predetermined intervals corresponding to the sizes of the displayed commodities as shown in FIG.


6


(B). By doing so, the top surface of the board main body


101


is partitioned into a plurality of regions and the commodity mounting pieces


112


A of the respective rolling stopper plates


112


are held horizontally. In this state, if the commodities are put on the upper surfaces of the commodity mounting pieces


112


A of the respective rolling stopper plates


112


, the commodities can be displayed on the inclined commodity display board


10


without dropping the commodities. In this case, the commodities can be displayed with apparently increased volume and different types of commodities can be displayed in order on the same commodity display board


10


.




Next, the second embodiment of the present invention will be described with reference to

FIGS. 7

to


13


. In

FIG. 7

, a commodity display board


20


comprises a rectangular, flat synthetic resin board main body


201


having a predetermined surface area necessary to display commodities. Many engagement holes


202


of slit-like grooves extending over the entire longer length of the board main body


201


are formed in parallel to one another at predetermined intervals in the shorter length direction of the board main body


201


. The engagement holes


202


of slit-like grooves are constituted to impart air permeability to the board main body


201


and to allow the commodity equipment


21


shown in

FIG. 10

to be detachably inserted into the engagement holes


202


.




Also, the width of each engagement hole


202


formed out of a slit-like groove is gradually increased from the top surface of the board main body


201


toward the rear surface thereof. As shown in

FIG. 8

, the bottom of the engagement hole


202


formed out of a slit-like groove is opened to the rear surface of the board main body


201


while being partially left as coupling portions


203


. By thus forming the engagement holes


202


, it is possible to prevent dust from being collected and clogged in the engagement holes


202


and to easily clean the engagement holes


202


. Further, as shown in

FIGS. 9 and 10

, ribs


204


guiding the commodity equipment


21


inserted into the respective engagement holes


202


are formed on the opposite inner wall surfaces of the engagement holes


202


formed out of slit-like grooves and located between the coupling portions


203


.




Next, an example as to how the commodity display board


20


in the second embodiment of the present invention is used will be described with reference to FIG.


11


. The commodity equipment shown in FIG.


11


(A) constitutes a strap-like rolling stopper plate


211


made of a transparent acrylic material or the like having a length corresponding to the longer length dimension of the board main body


201


shown in FIG.


11


(B). By inserting the lower edges of the rolling stopper plates


211


into the respective engagement boles


202


each formed out of a slit-like groove, the rolling stopper plates


211


are vertically attached to the board main body


201


as shown in FIG.


11


(B). If commodities such as vegetables and fruits are displayed on the commodity display board


20


while inclining the commodity display board


20


at a predetermined angle θ with respect to a horizontal plane, a plurality of rolling stopper plates


211


are attached to the board main body


201


at predetermined intervals and the commodities are put on the board main body


201


located on the upper surface sides of the respective rolling stopper plates


211


. By doing so it is possible to display the commodities on the inclined commodity display board


20


without dropping the commodities. In this case, the commodities can be displayed with apparently increased volume.




Next, another example as to how the commodity display board


20


in the second embodiment of the present invention is used will be described with reference to FIG.


12


. The commodity equipment shown in FIG.


12


(A) constitutes a rolling stopper plate


212


made of a transparent acrylic material or the like having a length corresponding to the longer length or half the longer length of the board main body


201


shown in FIG.


12


(B). The rolling stopper plate


212


is bent into a generally V shape to thereby form a horizontal commodity mounting piece


212


A and a support piece


212


B.




The rolling stopper plates


212


constituted as stated above are attached to the board main body


201


as shown in FIG.


12


(B) by inserting the lower edge portions of the support pieces


212


B into the respective engagement holes


202


formed out of slit-like grooves and arranged in the longer length direction of the board main body


201


. At this moment, the lower edges of the commodity mounting pieces


212


A are held to come in contact with the top surface of the board main body


201


. If commodities such as vegetables and fruits are displayed on the commodity display board


210


while inclining the commodity display board


210


at a predetermined angle θ with respect to a horizontal plane, a plurality of rolling stopper plates


212


are attached to the board main body


201


at predetermined intervals as shown in FIG.


12


(B). At this moment, the commodity mounting pieces


212


A of the respective rolling stopper plates


212


are held horizontally. In this state, the commodities are mounted on the upper surfaces of the commodity mounting pieces


212


A of the respective rolling stopper plates


212


. By doing so, the commodities can be displayed on the inclined commodity display board


20


without dropping the commodities. In this case, the commodities can be displayed with apparently increased volume.




Next, yet another example as to how the commodity display board


20


in the second embodiment of the present invention is used will be describe with reference to FIG.


13


. The commodity equipment shown in FIG.


13


(A) constitutes a longitudinal partition plate


215


made of a transparent acrylic material or the like having a length corresponding to the shorter length dimension of the board main body


201


shown in FIG.


13


(B). Protrusions


215


A engaged with the respective engagement holes


202


of the board main body


201


are formed on the lower edge of the longitudinal partition plate


215


. Also, in FIG.


13


(B), the display equipment each having a length corresponding to one-third or less of the longitudinal dimension of the board main body


201


constitute lateral partition plates


216


each made of a transparent acrylic material or the like.




If the commodity display regions of the board main body


201


are partitioned according to the types of commodities using such longitudinal partition plates


215


and lateral partition plates


216


, the longitudinal partition plates


215


are arranged to extend in the shorter length direction of the board main body


201


on the both end portions of the board main body


201


in the longer length direction and on portions on which the top surface of the board main body


201


is trisected in the longer length direction, and the protrusions


215


A of the longitudinal partition plates


215


are inserted into the respective engagement holes


212


, respectively, thereby attaching the longitudinal partition plates


215


to the board main body


201


as shown in, for example, FIG.


13


(B). A plurality of lateral partition platen


216


are attached to the respective regions of the board main body


201


partitioned by the longitudinal partition plates


215


, in parallel with one another at predetermined intervals each corresponding to the size of the displayed commodity. By doing so, the top surface of the board main body


201


is partitioned into plural commodity-display regions. In this state, the commodities are put in the commodity display regions partitioned by the lateral partition plates


216


and the longitudinal partition plates


215


, respectively. By doing so, the commodities can be displayed on the inclined commodity display board


20


without dropping the commodities. In this case, the commodities can be displayed with apparently increased volume and different types of commodities can be displayed in order on the same commodity display board


20


.




Next a commodity display board in the third embodiment of the present invention will be described with reference to

FIGS. 14

to


16


.

FIG. 14

is a perspective view of the commodity display board in the third embodiment of the present invention.

FIG. 15

is an enlarged perspective view of a coupling mechanism on a portion B of FIG.


14


.

FIG. 16

is an enlarged perspective view of a coupling mechanism on a portion C of FIG.


14


. In

FIG. 14

, coupling mechanisms


31


and


32


coupling the adjacent board main bodies


201


so that the top surfaces thereof are flush with each other, are provided on the both ends of the board main body


201


in the longer length direction (i.e., lateral direction) and the both ends thereof in the shorter length direction (i.e., longitudinal direction), respectively.




The coupling mechanism


31


couples the adjacent board main bodies


201


in the shorter length direction (i.e., longitudinal direction). As shown in

FIG. 15

, the coupling mechanism


31


consists of a plurality of L-shaped engagement portions


311


provided on one end face of the board main body


201


in the shorter length direction at predetermined intervals in the longer length direction of the board main body


201


and a plurality of inverse L-shaped engagement portions


312


provided on the other end face of the board main body


201


in the shorter length direction at predetermined intervals in the longer length direction of the board main body


201


. By engaging the inverse L-shaped engagement portions


311


of the adjacent board main body


201


with the L-shaped engagement portions


312


of the board main body


201


, respectively, the adjacent two board main bodies


201


can be coupled to each other while the top surfaces thereof are coincident with each other. Further, the coupling mechanism


32


couples the adjacent board main bodies


201


in the longer length direction (i.e., lateral direction). As shown in

FIG. 16

, the coupling mechanism


32


consists of a plurality of convex portions


321


provided on one end face of the board main body


201


in the longer length direction at predetermined intervals in the shorter length direction of the board main body


201


and a plurality of concave portions


322


provided on the other end face of the board main body


201


in the longer length direction at predetermined intervals in the shorter length direction of the board main body


201


. By engaging the convex portions


321


of the board main body


201


with the concave portions


322


of the adjacent board main body


201


, respectively , the two adjacent board main bodies


201


can be coupled to each other while the top surfaces thereof are coincident with each other.




According to the third embodiment of the present invention as described above, by coupling the adjacent board main bodies


201


using the coupling mechanisms


31


and


32


, the area of the commodity display board can be increased in longitudinal and lateral directions. Accordingly, the area of the commodity display board can be changed in accordance with the manner in which commodities are displayed.




In the first embodiment, description has been given to a case where no guide ribs are provided on the inner walls of the engagement holes


102


. The present invention should not be limited to this embodiment and guide ribs may be provided on the inner walls of the engagement holes


102


.




Further, according to the present invention, the coupling mechanisms in the third embodiment may be provided on the commodity display board


10


in the first embodiment.




Moreover, the modes of using the commodity display board


10


or


20


according to the present invention should not be limited to the examples shown in

FIGS. 5 and 6

and

FIGS. 11

to


13


, respectively. The commodity display board


10


or


20


can be applied to commodity display base plate of a wagon or the like and to the back plate for the displayed commodities.




Additionally, the engagement holes


102


or


202


for attaching the display equipment according to the present invention should not be limited to slit-like holes or slit-like grooves as described in the embodiments. If the display equipment such as rolling stoppers and partitions are made of metallic wires, the engagement holes may be round holes, elliptic holes or the like.




Needless to say, the coupling mechanisms


31


and


32


according to the present invention should not be limited to those constituted as shown in

FIGS. 14

to


16


.




INDUSTRIAL APPLICABILITY




As stated so far, according to the present invention, the commodity display board consists of a flat board main body having a predetermined surface area necessary to display commodities. Due to this, the board main body can be used as the base plate, the back plate, the inclined plate or the like of a cooling case, a wagon or the like to display commodities. Thus, the flexibility of the board main body enhances and the commodity display board can be applied to various modes of use in accordance with the manner in which the commodities are displayed.




Further, according to the present invention, engagement holes are formed on the entire top surface of the board main body at predetermined intervals. Due to this, partition plates or rolling stopper plates can be attached to the board main body using the engagement holes. As a result, the top surface of the board main body can be partitioned in accordance with displayed commodities, the board main body can be changed to various modes of use in accordance with the manner in which the commodities are displayed and the good air permeability of the board main body per se can be ensured.




Moreover, according to the present invention, the engagement holes are formed out of slit-like holes or slit-like grooves and the engagement holes are formed to be gradually enlarged from the top surface of the board main body toward the rear surface thereof. Thus, it is possible to prevent the engagement holes from getting clogged with dust and to easily clean the engagement holes.




Additionally, according to the present invention, adjacent board main bodies are coupled to each other using the coupling mechanisms of the board main bodies. Thus, the area of the commodity display board can be increased longitudinally and laterally, accordingly, the area of the commodity display board can be changed in accordance with the manner in which the commodities are displayed.



Claims
  • 1. A commodity display board for displaying commodities, comprising:a flat board main body having a predetermined surface area necessary to display the commodities; and a plurality of engagement holes for attaching display equipment and permeating air formed on an entire region of a top surface of the board main body at predetermined intervals, wherein said engagement holes are formed out of slit-like grooves extending over an entire length of one edge of said board main body, and the slit-like grooves are arranged parallel to one another in large number at predetermined intervals in a direction of the other edge of said board main body, and wherein a width of each of said slit-like grooves is gradually increased from a top surface of said board main body toward a rear surface of the board main body, and a bottom of each of said slit-like grooves is opened to the rear surface while being partially left.
  • 2. A commodity display board according to claim 1, further comprising:a rib guiding said display equipment formed on one of an inner wall surface of each of said slit-like engagement holes and an inner wall surface of each of said slit-like grooves.
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Number Name Date Kind
3497081 Field et al. Feb 1970 A
3954184 Mendenhall May 1976 A
4768661 Pfeifer Sep 1988 A
4941784 Flament Jul 1990 A
4942968 Fast Jul 1990 A
5255802 Krinke et al. Oct 1993 A
5441709 Berry, Jr. Aug 1995 A
5971826 Delzompo et al. Oct 1999 A
6244447 Frieze et al. Jun 2001 B1
6364130 Wright Apr 2002 B2