A BOLT TYPE LOCK

Abstract: A bolt-type lock comprising a lock case having a face plate (11) to which there is firmly connected a cylindrical guide sleeve (2), in which a substantially cylindrical bolt (3) which co-acts with a striking plate (4) is arranged for linear movement and is guided through the intermediary of a movable auxiliary sleeve (5) which is held against axial rotation in the guide sleeve but axially movable therein, the bolt (3) accompanying the axial movement of the auxiliary sleeve and being caused to execute rotational movement in the proximity of a latching position through the action of camming means (6, 7). The bolt (3) has a strap (10) which forms an abutment with the face plate (1). The strap and the auxiliary sleeve (5) are provided with rotation latching means (10a, 5a) which are separate from the camming means and which in the rotated latching position prevent mutual rotation between the bolt (3) and the auxiliary sleeve (5).

Description: A BOLT-TYPE LOCK The present invention relates to a bolt-type lock of the kind that comprises a lock case which has firmly connected therewith a cylindrical guide sleeve in which a substan¬ tially cylindrical bolt which co-acts with a striking plate is arranged for linear movement and is guided through the intermediary of a movable auxiliary sleeve which is held against rotation in the guide sleeve but movable in the direction of its longitudinal axis, the bolt accompanying the axial movement of the auxiliary sleeve and being caused to execute rotational movement in the proximity of a latch¬ ing position through the action of camming means. One such bolt-type lock is known from US-A-1 907 625 and is intended for locking the displaceable glass covers of a display cabinet or case. The known lock is relatively complicated, in so much as in addition to the abovementioned components it also includes an inner guide sleeve which is fixedly located radially between the bolt and the auxiliary sleeve and which co-acts with said camming means and forms an axial abutment for the bolt in its latching or locking position. The object of the present invention is to provide a simpler bolt-type lock which does not require the provision of an inner guide sleeve and which will, nevertheless, afford a more positive locking or latching effect in the latching position. In this regard, the bolt shall be held against rotation about its longitudinal axis and preferably also against axial movement from its latching position. This object is achieved with a bolt-type lock in which the bolt has provided on the cylindrical surface thereof first means which forms an axial abutment against the face plate of the lock, and second means which co-act with the auxil¬ iary sleeve and form axial rotation latching means which are separate from the camming means and which in the rotated latching position of the bolt prevent mutual axial rotation 5 between the bolt and the auxiliary sleeve. This provides a lock which is of particularly simple construction and which comprises only a few components (in principle, the lock case with face plate and guide sleeve, bolt and auxiliary sleeve, and striking plate) , ' and will also enable the lock 0 to be fitted in a convenient manner, e.g.. when fitting the lock to a door (only one cylindrical hole need be drilled, for the guide sleeve) , while the locking action provided is highly reliable, due to the presence of the separate rota¬ tional latching means. 5 In accordance with a preferred embodiment, the first means operative as an abutment consists of a strap which extends circumferentially around the bolt and protrudes radially therefrom, whereas the second means, which is operative in 0 preventing axial rotation , may conveniently consist in a recess located in the strap and co-acting with a latching tongue which projects axially from the auxiliary sleeve and which enters the recess when the bolt occupies its latching position. Such separate rotation latching means will re- 25 liably hold the bolt against axial rotation in its latching position, independently of the camming means operative in causing the bolt to rotate axially in relation to the auxil¬ iary sleeve in the proximity of the latching position. Consequently, the camming means can be constructed and di- 3.0 mensioned solely for ensuring that said axial rotation is effected with but small friction and with good guiding ac¬ tion, and, for example, may have the form of a pin which extends radially from the bolt and which is intended to en¬ gage a guide groove in the auxiliary sleeve, whereas the sep- 35 arate rotation latching means may be constructed and di- mensioned solely for effectively latching mutual axial ro¬ tation in the rotated latching position. The strap on the bolt may also be provided, advantageously, with separate drive means, e.g. in the form of a recess which co-acts with an internal guide rib which extends axially along the guide sleeve surrounding the auxiliary sleeve and the bolt. The separate guide means holds the bolt against rotation about its long axis as the bolt is moved axially towards an axial terminal position, in which position the strap is also operative in preventing rearward movement of the bolt relative to the guide sleeve, subse¬ quent to the bolt having rotated to its latching position. The bolt is therewith also latched effectively against axial movement from its latching position. The invention will now be described in more detail with reference to the accompanying drawings which illustrate a preferred embodiment of the lock. Figure 1 is a perspective view of the most essential compo¬ nents of the lock according to the invention, these compo¬ nents being shown separated from one another so as to enable them to be seen more clearly; Figure 2 is a perspective view of a bolt forming part of the lock shown in Figure 1 ; Figure 3 is a perspective view of an auxiliary sleeve form- ing part of the lock shown in Figure 1 ; Figure 4 is a perspective view of the lock of Figure 1 when assembled; Figures 5a-5d illustrate the lock of Figures 1-4 fitted to a door, the lock being operated by means of a conventional cylinder lock; and Figures 6a-6c illustrate an installation which comprises two slightly modified bolt-type locks which are operated with the aid of push rods connected to a mutually common handle. The bolt-type lock illustrated in Figures 1-4 comprises mainly a lock case 1 having a face plate 11 and a cylindri¬ cal guide sleeve fixedly joined thereto. The sleeve has arranged for linear movement therein a substantially cylin¬ drical bolt 3 which co-acts with a striking plate 4 and which is guided through the intermediary of a movable aux- iliary sleeve 5. The auxiliary sleeve 5 is held against axial rotation in the guide sleeve 2, through the mutual co-action of ' an axially extending slot 9 (Figure 3) and a guide rib 8 (Figure 1) which extends internally along the guide sleeve 2 longitudinally thereof, such as to allow the sleeve 5 to be moved axially within the guide sleeve 2. In the case of the embodiment illustrated in Figures 1-5, the auxiliary sleeve 5 has a rearwardly located, axially extending rack 12 which is intended to engage a gear drive or pinion (c.f. Figure 5) for manipulation of the aux- iliary sleeve in its axial direction. The bolt 3 comprises a solid, essentially cylindrical body which is dimensioned to fit internally into the auxiliary > sleeve 5 and which is arranged for restricted axial movement relative thereto. The bolt 3 has provided thereon a pin 6 which projects radially from the bolt in mutually opposite directions and which is guided in a curved camming or guide groove 7 located on a respective side of the auxiliary sleeve 5 (see Figure 3) , such that the bolt 3 is caused to follow the axial movement of the auxiliary sleeve 5 in a direction towards a terminal position in which a strap 10 extending circumferentially around the bolt strikes directly against the face plate 11 at a location adjacent the circu¬ lar opening 12 thereof. As will be seen from Figure 2, the pin 6 is fitted loosely in a transverse hole 13 in the bolt 3, wherewith a locking pin 14 located in a bottom hole 15 extending axially of the bolt is biassed by a coil spring 16 into engagement with a groove 6a located midway along the pin 6, such as to hold the pin in its intended position in the hole 13. During the combined axial movement of the auxiliary sleeve 5 and the bolt 3 to the terminal position defined by the abut¬ ment of the strap 10 with the base plate, both the sleeve 5 and the bolt 3 are held against rotation about their longi¬ tudinal axes through the co-action between on the one hand the slot 9 on the sleeve 5 (Figure 3) and a recess 10b (Fig¬ ure 2) in the strap 10 of the bolt 3, and on the other hand the internal guide rib 8 on the inner surface of the guide sleeve 2 (Figure 1), the pin 6 therewith being held in the terminal position in the guide groove 7, as illustrated in Figure 1. However, the guide rib 8 terminates at a distance from the face plate 1 such that when the bolt 3 occupies its axial abutment position, the rib 8 is no longer active against the bolt 3, and during continued axial movement of the auxiliary sleeve 5, the pin 6 will follow the contours of the guide groove 7 until the pin reaches the other end 7a of the groove, the bolt 3 being rotated to some extent about its longitudinal axis, in the direction of the arrow P. During this axial rotation, an axially and forwardly pro¬ jecting latching tongue 5a on the auxiliary sleeve 5 is moved, at the same time, into an axially extending recess 10a in the strap 10 on the bolt 3, this insertion of the tongue 5a being facilitated by a chamfer 5b provided on the side of the tongue. Thus, in the terminal locked position the bolt 3 is also locked against axial rotation, by the tongue 5a and the auxiliary sleeve 5, in which position the slot on the sleeve 5 is also in engagement with the guide rib 8 on the guide sleeve 2 and thus holds the auxiliary sleeve against axial rotation. Furthermore, the strap part 10c located between the recesses 10a and 10b on the strap 10 effectively latches the bolt 3 against rearward axial movement, since in the axial rotated position the part 10c is located opposite the forward end of the guide rib 8 (upper part of the Figure 1 illustration) . The forwardly located end part 3a of the bolt of the illus¬ trated embodiment has spaced circumferentially therearound radially projecting promonatories or teeth 3b which are di- mensioned to fit into corresponding recesses 4b located circumferentially around a hole 4a in the striking plate 4, wherewith subsequent to the bolt having been rotated axially to its latching position, the bolt is latched positively against axial movement relative to the striking plate 4, so that the bolt is locked both axially and radially all round (c.f. Figure 4) . The bolt-type lock is thus highly reliable, since when in its locking or latching position the bolt 3 is held against axial movement (by the fixation of the strap 10 between the face plate 11 and the forward end of the guide rib 8) and against circumferential movement (by the engagement of the latching tongue 5a in the recess 10a of the strap 10) in¬ dependently of both the camming means 6, 7 and the engage- ment between the end part 3a of the bolt and the striking plate 4. The components in locking engagement with one another are thus protected by the guide sleeve 2, which is preferably welded firmly to the base plate 11. The lock according to the invention can be used in many dif- ferent contexts, and two exemplifying methods of installa¬ tion are illustrated in Figures 5a-5d and Figures 6a-6c respectively. Thus, Figure 5a is an exploded view in perspective which illustrates a method for fitting a bolt-type lock constructed essentially in accordance with Figures 1-4 to a door as a door lock. The lock case 1, the face plate 11 and the guide sleeve 2 are herewith fitted respectively into a recess 21 and a cylindrical bore 22 provided in the free, vertical edge surface of a door leaf 20, whereas the striking plate 4 is fitted correspondingly to the oppositely located door frame, not shown. In the illustrated case, the lock is manipulated with the aid of a conventional cylinder lock 23, which is inserted in a cylindrical insert sleeve 24, which in turn is inserted in a cylindrical hole 25 that passes through the door leaf 20, the outgoing shaft 23a of the plug or cylinder of the cylinder lock being non-rotatably connected to a gear drive or pinion which engages the rack 12 on the auxiliary sleeve 5. The hole 25 and the components located therein are covered by a cover plate 27 on the inside of the door leaf and by a cylinder cap 28 on the outside of the door leaf, in a con- ventional manner, the plug or cylinder 23 being secured to the insert sleeve 24 by means of a first array of screws 29 and the cylinder cap 28 being secured to the cover plate 27 on the inside of the door leaf by means of a second array of throughpassing screws 30. It will be seen from Figures 5a-d that the striking plate of this embodiment incorporates a sleeve part 4c which is in¬ tended for insertion into a bore provided in the door frame and which has an internal ring part 4d, this ring part form- ing the opening 4a which has recesses 4b spaced circumferen- tially therearound (Figures 5b and 5d) for co-action with the end part 3a of the bolt 3, said recesses corresponding to the radial promonatories 3b of the bolt end part 3a. The sleeve part 4c has an inner end wall 4d in which there is provided an opening 4e for securing the sleeve part 4c in the bore (lined bore) provided in the door frame, with the aid of a suitable fastener, such as a screw (not shown) , Figure 5b is a view in vertical section of the door lock in its locking mode, whereas Figure 5c illustrates, partly in horizontal section and from above, the door lock in its non¬ locking mode, with parts of the insert sleeve 24 cut away. Figures 6a-6c illustrate schematically an exemplifying method of moving the auxiliary sleeve 5' of the lock axially in a manner other than with the aid of a rack, namely by connecting the sleeve directly to an axially movable rod. In this embodiment, each of two bolt-type locks A, B is connected to a respective axially movable rod 31 and 32 which are pivotally connected to a mutually common rotatable connecting plate 34 by means of a handle 33, which is prefer¬ ably lockable per se. Thus, the locks A and B can be manip¬ ulated into locking engagement with their associated striking plates 4' simultaneously, by turning the handle 33, (see Fig- ure 6b and 6c) . Other components which correspond with similar components of the embodiments illustrated in Figures 1-5 have been identified by the same references with the addition of a prime. An arrangement such as this can be fitted, for instance, to garage doors, balcony doors, large shutters, trap doors, hatches and windows, etc. The aforedescribed bolt-type lock according to Figures 1-6 can be modified in many ways within the scope of claim 1. For example, the latching engagement of the bolt 3 with the striking plate 4 can be achieved in any desired manner. Furthermore, the rotation latching means 10a, 5 between the bolt 3 and the auxiliary sleeve can be replaced with a pro¬ jection which extends axially rearwards from the strap and which engages a recess provided in the forward end of the auxiliary sleeve, and similarly the guide means 10b, 8 can be replaced with other complementary means of the bolt 3 and the guide sleeve 2 (e.g. pin and groove) . The auxiliary sleeve 5 can also be held against axial rotation relative to the guide sleeve 2 by means of alternative, complementary devices. The auxiliary sleeve may also be moved axially with the aid of other mechanical, electrical,pneumatic,■./or hydraulic operating means.

Claims: CLAIMS 1. A bolt-type lock which comprises a lock case (1) having a face plate (11) to which there is firmly connected a cylindrical guide sleeve (2) in which a substantially cylindrical bolt (3) which co-acts with a striking plate (4) is arranged for linear movement and is guided in said sleeve through the intermediary of a movable auxiliary sleeve (5) which is held against rotation in the guide sleeve but is axially movable therein, the bolt accompanying the axial movement of the auxiliary sleeve and being caused to execute rotational movement in the proximity of a latch¬ ing position through the action of camming means (6, 7), characterized in that the bolt (3) is provided on its cylin- drical surface with first means (10) , which form an axial abutment against the face plate (1) , and second means (10a) , which co-act with the auxiliary sleeve (5) and form rotation latching means which are separate from said camming means and which in the rotated latching position of the bolt pre- vent mutual rotation between the bolt (3) and the auxiliary sleeve (5) . 2. A lock according to Claim 1 , characterized in that said first means comprises a radially projecting strap (10) ex- tending circumferentially on the bolt (3) . 3. A lock according to Claim 2, characterized in that said second means comprises a recess (10a) in the strap (10) , said recess co-acting with a latching tongue (5a) which pro- jects axially from the auxiliary sleeve and which engages said recess (10a) in said latching position. 4. A lock according to Claim 3, characterized in that said latching tongue (5a) is chamfered or bevelled (5b) on one side thereof, so as to facilitate insertion of the tongue into the recess (10a) during rotational movement of the bolt in the proximity of said latching position. 5. A lock according to any of Claims 2-4, characterized in that the strap (10) on the bolt (3) , and the guide sleeve (2) have mutually co-acting guide means (10b, 8) which are separate from said camming means and which hold the bolt . (3) against axial rotation during axial movement of the bolt (3) relative to the guide sleeve (2) up to a position in the proximity of a terminal position in which the strap (10) , subsequent to rotation of the bolt to the latching position, also prevents rearward axial movement of the bolt in relation to the guide sleeve (2) . 6. A lock according to Claim 5 , characterized in that said guide means comprise a recess (10b) in the strap (10) and a guide rib (8) which extends axially on the inner surface of the guide sleeve (2) and which terminates at a distance from the face plate (11) corresponding substantially to the axial extension of the strap (10) . 7. A lock according to Claim 6, characterized in that the guide rib (8) also serves to hold the auxiliary sleeve (5) against axial rotation in the guide sleeve (2) .

Inventors: LINNARSSON PETER, LINNARSSON, PETER
Applicants: LINNARSSON PETER, LINNARSSON, PETER
Application year: 1987
Main classification: E05C15
IPC codes: E05B63