LV13191B

LV13191B - Striking plate

Info

Publication number: LV13191B
Application number: LVP-04-39A
Authority: LV
Inventors: Jorma Hirvi
Original assignee: Assa Ab
Priority date: 2001-09-25
Filing date: 2004-04-01
Publication date: 2004-10-20
Also published as: DK176937B1; EE200400079A; NO20041687L; DK200400473A; FI20040440A; EE05141B1; LT2004037A; LT5194B; NO334016B1; FI120208B; SE523992C2; WO2003042474A1; SE0103185D0; SE0103185L

Abstract

A striking plate (1) comprises a plate element (10) having an essentially planar upper surface (12, 16). The plate element has an aperture (11) arranged to receive a latch bolt (40) On the underside of the plate element there is provided a box (20) having an integral adjustable tongue (30). The tongue comprises a sliding portion (32a-c), which in the area of the aperture has a surface essentially flush with the upper surface of the plate element. The sliding plane is preferably provided with teeth engaging corresponding notches is the opening. The overlapping of the plate element and the sliding portion in the direction of movement of the latch bolt (40) prevents that the latch bolt is stuck in an unwanted immediate position.

Description

1 LV 13191

STRIKING PLATE

FDELD OFINVENTION

The present invention relates generally to a striking plate and more specifically to a striking plate that includes an adjustable tongue for adjustment of the engagement of a latch bolt or lock bolt with the striking plate.

BACKGROUND OF THE INVENTION

Several difFerent types of striking plate that can be fitted to a doorframe are commercially available. In its simplest form, the striking plate includes a generally flat face plate that includes one or more openings in vvhich a lock bolt or latch bolt can engage when the door is closed. In addition to the actual face plate, security-type-striking plates also include a generally U-shaped or V-shaped so-called box that prevents access to said bolts from “behind” the striking plate. Known striking plates may also include an adjustable so-called tongue, which adjusts engagement between, e.g., a latch bolt and the striking plate. This engagement is set so that the door will not be spaced from the door frame when the bolt engages the striking plate.

An example of a tongue-equipped striking plate Γ according to one known technique is shov/n in Fig. 1, which is a cross-sectional view of the plate at a Ievel with a latch-bolt-receiving opening. The illustrated arrangement includes a striking plate element 10’, a box 20’ and a tongue 30’ integral with said box. The tongue can be bent away with the aid of an appropriate tool, for instance, so as to obtain the correct tongue measurement, referenced “d” in the figurē. In the case of this known solution, the tongue 30’ does not extend up to the Ievel of the upper side of the plate element, i.e! the side facing to the right in the figurē. This results in a problem whereby a latch bolt is in danger of becoming jammed or stuck in an intermediate position, indicated in broken lines in the figurē. A further example of known lock technology is described in Swedish Patent Publication SE 346 582. The striking plate described in this publication comprises a lip that includes two forwardly projecting and adjustable tongues whose outer end edges lie in the planē of 2 the striking plate and are bent along a short distance. The primary object of the invention according to SE 346 582 is to simplify fitting of the striking plate, and does not solve the aforesaid problem associated with the danger of a latch bolt fastening in an intermediate position in the opening defined between the ends of the tongues and the striking plate. 5

SUMMARY OF THE INVENTION

An object of the present invention is to provide a striking plate of the aforesaid kind with which the problem mentioned above associated with a striking plate that includes an 10 adjustable tongue measurement is avoided.

The invention is based on the realisation that an adjustable tongue can extend up to the Ievel of the upper surface of the striking plate post. 15 According to the invention, there is thus provided a striking plate that has the features set forth in the accompanying Claim 1.

Further preferred embodiments are defined in the dependent Claims. 20 Thus, there is provided a striking plate with which the drawbacks and problems associated with known techniques are avoided. Because the adjustable tongue extends to the upper surface of the plate element there is obtained a generally flat latch-bolt sliding surface that prevents the latch bolt from fastening or jamming in an undesired intermediate position. 25 In the case of a particularly preferred embodiment, the adjustable tongue and the plate element overlap mutually in the direction of movement of the latch bolt.

BRIEF DESCRTPTION OF THE DRAVVINGS 30 The invention will now be described in more detail by way of example and with reference to the accompanying drawings, in which

Fig. 1 is a cross-sectional view of a known striking plate; 3 LV 13191

Fig. 2 is a cross-sectional view corresponding to that of Fig. 1 but showing a striking plate constructed in accordance with the invention;

Figs. 3-5 are perspective views of the inventive striking plate shown in Fig. 2;

Figs. 6 and 7 are respectively a side view and a plān view of the inventive striking plate shown in Figs. 2-5;

Figs. 8a and 8b are respectively a plān view and a cross-sectional view of the inventive striking plate, shov/ing an adjustable tongue in a first position; and

Figs. 9a and 9b are respective views corresponding to those of Figs. 8 and 8b, showing the adjustable tongue in a second position.

DESCRIPTION OF PREFERRED EMBODIMENTS A preferred embodiment of an inventive striking plate will novv be described in more detail. Referring first to Fig. 2, which is a cross-sectional view of an inventive striking plate, the plate 1 includes a plate element 10, a box 20 and a box-integral tongue 30. The plate element includes an opening 11 adapted to receive a latch bolt 40 of a lock (not shown) fitted to a door 42. The plate element has a generally flat upper surface 12, 16 which faces outwards when the striking plate is fitted to a door frame, i.e. faces tov/ards the door and the latch bolt 40 included in a door lock.

The tongue 30 includes a sliding part 32, which has a surface that lies essentially on a Ievel with the upper side 12 of the plate element. As the latch bolt 40 engages the striking surface, designated 13 in Fig. 2, of the plate element when closing the door, the latch bolt is caused to slide over said upper surface 12 and then to glide over the tongue portion 32 prior to reaching the position shovvn in the figurē when the door is fully closed.

The slide portion of the tongue 30 includes three teeth 32a-c.(see Fig. 3), the shape of which is adapted to corresponding notches in the aperture 11. The mutual spacing b between the teeth (see Fig. 7) is smaller than the width of the latch bolt 40. This results in an overlap betvveen the slide portion 32 and the plate element 10 in a direction r of the 4 movement of said latch bolt 40, therevvith preventing the bolt from sinking down into or fastening in a gap betvveen tongue and plate element. Thus, the latch bolt has a smooth sliding surface ali the way from the striking surface 13 to the opening 11. 5 As will be seen from the perspective views of Figs. 3-5, the plate element 10 has two mirror-imaged latch bolt openings 11. Located centrally between these openings is a Iock bolt opening 14. The plate element 10 also includes two symmetricaliy disposed screw holes 15. Because the entire striking plate is symmetrical, the same striking plate can be used for fitting both left-hand and right-hand locks. The box 20 has a generally U-shaped 10 cross-section (see Fig. 2) and includes a generally flat first side 20a, a generally flat second side 20b and a third side which includes two flat parts 20c, 20d, where the part 20c is generally parallel with the first side 20a and the second part 20d is angled to said first part. The second part 20d has two holes 21 for $crews 22. These screws will extend obliquely into the doorframe, as clearly shown in the figurēs. The significance of this will become 15 apparent from the following description, particularly from the description made with reference to Figs. 2, 8 and 9.

It will be seen from Fig. 2 that the box 20 extends up to a Ievel with the upper side of the plate element 10, in the region of the mounting hole 21. Those forces acting on a door, and 20 therewith also on the latch bolt 40, act essentially in the direction of the arrow F in Fig. 2, i.e. downwardly in the figurē. A screw 22 fitted in the hole 21 (see, for instance, Fig. 8b) will therewith take-up these forces in a satisfactory manner, by virtue of the fact that the box 20 extends into the opening 11 in the plate element, and also by virtue of the fact that the mounting hole 21 lies very close to that part of the box which extends into the plate 25 element. As will be apparent from Fig. 3, for example, the screw 22 can be screwed-in by virtue of a recess 1 ļa provided in the edge of the opening 11, said recess enabling the mounting holes to be placed close to the bolt post. The Central positioning of the lock bolt opening 14 results in uniform loading of the two oblique mounting screws 22, v/hich is advantageous from a strength aspect. The closer the screws to the plate element, the better 30 the fastening of the screws 22.

The adjustability of the tongue 30 will now be described vvith reference to Figs. 8a, 8b and 9a, 9b. Figs. 8a and 8b illustrate a position in which the tongue measurement “d” is a minimum. The teeth 32a-c are essentially adjacent the plate element 10 in the absence of 5 LV 13191 any clearance. Figs. 9a and 9b, on the other hand, show the tongue at maximum tongue measurement. In this case, the teeth 32a-c are in a border position in which they do not overlap the plate element in the direction of movement of the latch bolt, shown by the arrow “r” in the figurēs. A practical setting range is as large as 3 millimetres, or stili greater in certain cases. The tongue 30 is adjusted preferably with the aid of an appropriate tool, such as a screwdriver or the like, with which the tongue can be inclined at a desired angle relative to the first side 20a of the box.

As will be apparent from Figs. 8b and 9b, the tongues 32b are bent or curved slightly upwards, i.e. to the right in the figurēs. The upper side of respective tongues will thereby lie essentially Ievel with the upper side of the plate element, regardless of the tongue setting.

Although an inventive striking plate has been described with reference to a preferred embodiment thereof, the person skilled within this particular technical field will understand that variations are possible within the scope of the accompanying Claims. For example, although the attitude of the tongue 30 in the illustrated embodiment has been said to be set by means of a screwdriver or some other appropriate tool, it will be obvious that the attitude of the tongue can be adjusted and set with the aid of a setting screw that extends into the tongue.

Moreover, although the tongue 30 has been shown to include three teeth 30a-c, it is, of course, conceivable to use any number of teeth, provided that the mutual spacing of the teeth is smaller than the width of a co-acting latch bolt.

It wi!l also be understood that although the box 20 has been shown to have a U-shaped cross-section, the box may be given shapes that deviate from the illustrated shape, such as a generally V-shape, etc.

The plate element has been shown as being generally flat, although it wili be understood that the plate element may include a part which is angled to said upper side 12, as in the case of rebated doors, for instance. 6 LV 13191

CLAIMS 1. A striking plate (1) comprising: - a plate element (10) that has an essentially planar upper surface (12, 16), and which includes an aperture (11) arranged to receive a latch bolt (40); - a box (20) provided on the underside of the plate element; and - an adjustable tongue (30) which is integral with the box and which includes a sliding portion (32) that has in the area of the aperture a surface which is essentially Ievel with the upper side of said plate element, characterised in that - the plate element (10) and said sliding portion (32) overlap in the direction (r) of movement of the latch bolt (40), and - said sliding portion (32) includes tongues (32a-c), preferably three tongues; and in that said aperture (11) includes tongue-receiving notches, wherein the tongues (32a-c) are mutually spaced at a distance (b) smaller than the width of the latch bolt (40). 2. A striking plate according to Claim 1, comprising two symmetrically positioned apertures (11). 3. A striking plate according to Claim 1 or 2, in which the box (20) extends up to the Ievel of said upper side (12, 16) of said plate element (10), at least in the region of said aperture or apertures(ll). 4. A striking plate according to Claim 3, in which said aperture or apertures (11) includes a recess (1 la) in the region of said aperture(s) (11). 5. A striking plate according to Claim 3 or 4, in which said box (20) includes a mounting hole (21) where said box extends up to the Ievel of said upper side of the plate element. 6. A striking plate according to any one of Claims 1-5, in which said sliding portion (32) is curved. 7. A striking plate according to any one of Claims 1-6, in which said tongue (30) has a width that corresponds essentially to the width of said aperture (11).

Claims

Formula 1: A thrust plate (1) comprising: - a plate-like element (10) having a substantially flat top surface (12, 16) and an opening (11) adapted to receive a barrier bolt (40); - a box (20) placed on the underside of the plate-like element, and - an adjustable tongue (30) integral with the box and comprising a sliding portion (32) having a surface substantially in the area of the opening with the top surface of said plate-like element; characterized in that - the plate-like element (10) and said sliding part (32) overlap in the direction of movement (r) of the pushing arrow (40) and - said sliding part (32) comprises a tongue (32a-c), preferably three tongues, and said opening (11) comprises tongue-receiving recesses, wherein the tongue (32a-c) is spaced apart at a distance (b) which is less than the width of the stopper (40).

2. Flush plate according to claim 1, characterized in that it comprises two symmetrically arranged openings (11).

3. Flush plate according to claim 1 or 2, characterized in that the box (20) extends to the level of the upper side (12,16) of said plate-like element (10) at least in the area of said aperture or openings (11).

The thrust plate according to claim 3, characterized in that said opening or openings (11) include recesses (11a) in the region of said opening (11).

The thrust plate according to claim 3 or 4, characterized in that said box (20) comprises a mounting hole (21) at a position where the box extends to said upper side of said plate-like element.

6. Flush plate according to any one of claims 1 to 5, characterized in that the sliding part (32) is convex.

7. Flush plate according to any one of claims 1 to 6, characterized in that the width of the tongue (30) substantially corresponds to the width of said opening (11).