Label-holder element for electrical terminal blocks

Label-holder element for electric switchboard terminal blocks (100), comprising a body (10;110;210;310;410) extending in a longitudinal lengthwise direction (X-X), transverse widthwise direction (Y-Y) and vertical thickness direction (Z-Z), with a front face (10a) provided with a seat (20) for labels (30), side faces (10b) and a rear face (10c;110c;210c;310c;410c),

The present invention relates to a label-holder element for electric switchboard terminal blocks. It is known, in the technical sector relating to the construction of switchboards for the wiring of electrical installations, the use of terminal blocks adapted to be mounted on associated mounting rails and to provide access on the front to the means—normally of the screw type—for retaining the electrical connection wires which form the electric circuit.

It is also known that, owing to the increasingly greater complexity of electric switchboards, it is necessary to mount on each terminal block a corresponding identification label which must be visible at the front for reading by the user.

For this purpose, for example, EP 2,355,251 in the name of the same present Applicant discloses terminal blocks for electric switchboards which have a suitable front seat for containing a label.

It is also known, however, that on the market there exist different types of terminal blocks which each have a different seat for receiving the label or even do not have such a seat, with the result that it is not possible to standardize said seat, resulting in evident wastage of material, the need for stocks of different types of labels, as well as different types and sizes of the writing to be applied on them.

DE 85 06 254 U1 describes a label holder which has opposite sides in a transverse widthwise direction. Each side has a fold suitable for retaining the label in said transverse direction; the label must consequently be inserted along the longitudinal lengthwise direction of the label holder. The label holder has means which project outwards from its surface and which are rigid and oriented in the same longitudinal direction.

DE 20 2009 003250 U1, FR 76 932 E and DE 973 473 E also describe a label holder which has opposite sides in transverse widthwise direction. Each side has a fold suitable for retaining the label in said transverse direction; the label must be inserted along the longitudinal lengthwise direction of the label holder.

DE 20 2004 010070 U1 describes a label with coupling means projecting from a surface thereof.

The technical problem which is posed therefore is that of providing a label-holder element which is able to allow easy and safe coupling with/uncoupling from different types of electric terminal block, while ensuring the features of safety, prevention of accidental removal of the label and good visibility of the label by the user.

In addition it is also desired to achieve a greater standardization of the label and the associated writing.

In connection with this problem it is also required that the label-holder element should be easy and low-cost to produce and that it may be quickly mounted on/removed from the terminal block.

These results are obtained according to the present invention by a label-holder element for electric switchboard terminal blocks, comprising a body extending in a longitudinal lengthwise direction, transverse widthwise direction and vertical thickness direction, wherein the body includes:a front face provided with a seat for labels;a rear face opposite the front face in the vertical direction;side faces opposite to each other in the transverse direction;at least one pair of teeth for coupling with a terminal block, extending outwards from the rear surface of the body.

Each tooth has an elasticity in the longitudinal direction suitable for allowing the tooth to flex elastically in the longitudinal direction.

The seat has a top edge and a bottom edge arranged opposite each other in the longitudinal direction and configured for engaging a label and is open laterally in the transverse direction on at least one side to allow insertion/extraction of a label from at least one side of the seat.

The top edge and the bottom edge may each have a respective tooth for engaging the label, wherein each tooth forms a corresponding undercut towards the inside of the seat.

Each tooth of the seat may preferably extend over the entire width of the seat in the transverse direction.

The oppositely arranged teeth of the seat may have a rounded edge.

Each tooth of at least one pair of coupling teeth may preferably have the form of an elongated “C” and an internal cavity situated between the arms of said “C”, so to provide the coupling teeth with the desired elasticity.

At least two coupling teeth may be arranged opposite each other and projecting outwards from the rear face obliquely with respect to the vertical direction.

The element may preferably comprise a base extending outwards and in turn comprising a central body in which two recesses suitable for coupling with the reliefs of an underlying label-holder element are formed.

The top and bottom edges of the seat may be formed so as to define a block which has an internal cavity open laterally on one of the two sides of the body and extending in the transverse direction as far as a blind bottom face formed by the other side of the body, for engaging a label. The said internal cavity may be shaped in the manner of a first substantially trapezoidal space connected to a second substantially I-shaped space. The said first trapezoidal space has preferably inclined sides designed to interfere with a lateral relief of a head of a tooth projecting from the bottom surface of a label.

The rear face of the body has preferably an inclined contact surface, with an inclination from the outside towards the inside of the body in a plane parallel to the longitudinal and vertical directions.

At least one relief may extend in the vertical direction on the front surface of the seat, preferably arranged in a central position with respect to the transverse extension of the seat.

The seat is preferably open on both sides in the transverse direction for inserting the label from one side or the other side.

The front surface of the seat may comprise a depression.

As shown inFIG. 1and assuming solely for easier description and without a limiting meaning a set of three reference axes having, respectively, a longitudinal direction X-X corresponding to the greater dimension or length of the label-holder element and the label; transverse direction Y-Y corresponding to the smaller dimension or width of the label-holder element and the label; vertical direction Z-Z corresponding to the thickness of the label-holder element and perpendicular to the first two axes, and a front or end side corresponding to the face for containing and reading the label and a rear face opposite to the front face, a first example of the label-holder element according to the present invention comprises:a body10with a front face10a, rear face10c, opposite to the front face in the vertical direction Z-Z, and side faces10bopposite to each other in the transverse direction Y-Y;a seat20for holding the label30, formed in the front side10aof the body10, which seat has a top edge20aand bottom edge20barranged opposite each other in the longitudinal direction X-X and formed in the manner of a respective tooth21,22extending in the transverse direction Y-Y over the width of said seat20.

Each tooth forms a corresponding undercut23. Preferably said teeth21,22arranged opposite each other have an edge21a,22asuitably rounded to facilitate a frontal insertion of the label30.

The seat20is open laterally in the transverse direction Y-Y on at least one side so as to also allow a lateral insertion of the label30in addition to insertion from the front.

According to a first preferred embodiment (FIGS. 1,5a) the front surface20cof the seat20is provided with a depression26for allowing the label to bend with an inwards convexity in order to facilitate frontal insertion and engagement inside the opposite undercuts of the seat.

According to preferred embodiments at least one relief25is formed (FIG. 16), said relief being arranged on the bottom of the cavity20;

in the embodiments with the depression26of the cavity20(FIG. 1) two reliefs25are arranged on the outside of the depression26and symmetrically relative thereto in the longitudinal direction X-X.

The inner front face30cof the label also has preferably formed therein at least one cavity35(FIGS. 4,6) extending in the vertical direction Z-Z and having a depth substantially corresponding to the height of the relief(s)25of the seat20in the element10, so as to allow stable relative engagement and prevent any sliding of the label in the transverse direction Y-Y, once the label30has been correctly engaged inside the undercuts23.

The rear face10cof the label-holder element is provided with means40for coupling with supporting devices on which an identification label30must be mounted.

In a first embodiment (FIG. 3) said supporting means are formed by electric switchboard terminal blocks100provided with hollow seats101in the visible front surface100aof the said terminal block.

The coupling means of the label-holder element comprise at least two teeth40extending outwards in the vertical direction Z-Z from the rear face10cand suitable for coupling with the said seats101formed in the front face100aof the switchboard terminal block100.

Each tooth40has an elasticity in the longitudinal direction X-X which allows it to flex along this direction X-X.

In greater detail, the teeth40have the form of an elongated “C” with the internal cavity41, situated between the arms40aof the “C”, so as to provide them with a certain degree of elasticity in the longitudinal direction X-X.

In this way, when inserted inside the seat of the terminal block, the arms40amay be elastically deformed, reducing the distance between the arms40ain the longitudinal direction X-X so as to return elastically into the rest configuration once inserted fully inside the seat101of the terminal block, thus ensuring stable coupling together of the terminal block and the label-holder element.

As shown inFIG. 4, the elasticity of the arms40aallows the linear insertion in terminal blocks with seats101corresponding to the teeth40(FIG. 4a), but also insertion in terminal blocks in which the seats101have a bigger spacing (FIG. 4b), whereby the teeth40elastically flex away from each other, or a smaller spacing (FIG. 4c), whereby the teeth40flex elastically moving towards each other.

FIG. 5ashows a second embodiment of the label-holder element where the rear face110chas an inclined contact surface which, according to the directional layout of the figure, has an inclination from the top downwards in the longitudinal direction X-X and from the outside towards the inside of the body110in the transverse direction Y-Y; in this way the mounting arrangement may be such (FIG. 5b) as to allow in relation to the user a preferred direction of viewing, also from above, by the user, also in the case of terminal blocks1100which are single or stacked (FIG. 5b) where the front surface1100ais greatly inclined relative to this viewing direction and/or to the vertical, this inclination making the label difficult to read.

In this embodiment the two rear teeth40may be arranged in a substantially central position in the longitudinal direction X-X.

FIG. 6shows a third embodiment of the label-holder element210where the rear face210chas two teeth240which project outwards obliquely with respect to the two directions, i.e. longitudinal direction X-X and vertical direction Z-Z, and are elastically deformable in the said longitudinal direction X-X.

In this configuration the base211of the label holder extends outwards and comprises a central body211ain which two incisions211bsuitable for engagement with the reliefs25of the underlying label-holder element10,110are formed.

In this configuration (FIG. 9) a base label-holder element10,210as illustrated inFIGS. 1, 5aand the element210described above may be coupled together by means of engagement of the teeth of the latter inside the opposite undercuts23of the former. In this way the assembly consisting of label-holder element10and label-holder element210is particularly suitable for insertion both on terminal blocks with dedicated seats and on terminal blocks provided with an adapter having any configuration.

In addition, the label-holder element210is particularly suitable (FIGS. 7,8) for allowing the engagement of connection elements250—known in the sector by the term “straps”—in order to fasten together several label-holder elements, increasing the stability thereof and reducing the possibility of their becoming detached and falling or swapping of the wires and/or terminal blocks in the event of temporary removal and/or replacement during maintenance operations.

Fitting of the straps on the base label holder10would in fact not allow correct introduction of the label inside the respective seat.

FIGS. 10 to 12show a fourth embodiment of the label-holder element510which in this case has top and bottom edges of the seat20formed in the manner of engaging means consisting of a block522which has an internal cavity523open laterally on one of the two sides20bof the body510and extending depthwise in the transverse direction as far as the blind bottom face formed by the other side of the body510.

Preferably the cavity523is formed in the manner of a first substantially trapezoidal space523awith oblique sides523aand connected to a second substantially I-shaped space523b.

Said cavity523allows in this way insertion of teeth540extending outwards from the bottom surface of a label530and having a form matching that of the cavity523.

In greater detail the teeth540have a head540aintegral with a straight shank540b; the head540ahas a lateral relief540c.

With this configuration each tooth may be displaced in the transverse direction Y-Y inside the cavity523and, once insertion has been completed, the lateral relief540cinterferes with inclined sides523cof the cavity523, preventing in this way the label from coming out in the transverse direction Y-Y.

The bottom surface510cof the label510is formed in a manner similar to that of the label holder210and has the same elements240,211b,211,211a—the above description of which is not repeated and is fully applicable here—in particular the teeth240for coupling with corresponding reliefs111defining a seat101of a terminal block100for mounting the label530.

FIGS. 13-15show a variation of embodiment of the label holder510in which the cavity20is further formed as solid parts524alternating with cavities523, similar to those which act as engaging means523of the top edges521,522of the seat520situated in the end position in the embodiment shown inFIGS. 10, 12, thus reproducing the configuration of the seats101present in the terminal block100as shown inFIGS. 3,4.

Although not shown, it is understood that the adapter/label assembly is assembled by inserting the bottom edge30bof the latter into the bottom undercut23of the seat20so that the bottom tooth22of the same interferes with the bottom edge of the label30; once the respective bottom edges have been engaged together, the label30is pushed frontally in the vertical direction Z-Z so as to force insertion of the top edge30aof the label into the top undercut23of the seat20of the terminal block10, causing interference between the top tooth21and the top edge30aof the label; engagement together in the front direction being facilitated by the small relative sliding friction of the surfaces due to the rounded form of the teeth and edges which come into contact with each other.

Once frontal insertion of the label30has been completed, the cavity35thereof engages with the relief25of the seat20, causing locking of the label also in the transverse direction Y-Y, the label being prevented from accidentally coming out in this direction.

As shown in particular inFIG. 16, the label-holder element has a laterally open seat20which allows insertion/extraction of a label30also from the sides and, in the case of an opening on both sides, both from the right and from the left, therefore also allowing the mounting of labels in strip form which can be inserted on blocks of label-holder elements arranged alongside each other in the transverse direction Y-Y in alignment with supporting terminal blocks in turn arranged alongside each other and/or coupled together in the transverse direction Y-Y.

In the specific application it is also possible to provide labels without a recess35since the force applied by the relief25on the label causes an elastic deformation which creates a reaction in the longitudinal direction X-X in the region of the teeth21,22and a friction in the transverse direction Y-Y on the projection such as to stably retain the label in the seat.

It is therefore clear how the label-holder element according to the invention is easy and low-cost to produce and is able to form a versatile assembly which may be easily mounted on different types of electric terminal block in a stable and therefore safe and reliable manner owing to at least one pair of teeth extending from the rear face and the particular structure of the label-holder seat and the possibility of using substantially flat standardized labels which have a uniform thickness and are made using different plastic and/or paper materials, as well as the possibility of both frontal and lateral and also, where necessary, multiple insertion.

Although described in connection with a number of embodiments and a number of preferred examples of embodiment of the invention, it is understood that the scope of protection of the present patent is determined solely by the claims below.