US2841974A - Bolt lock - Google Patents

Description

E. HENSEL BOLT LOCK July 8, 1958 Filed March 28, 1954 I In! IYI n w I V 9 ,4 5

v INVENTOR EP/cH HENSEL ATTORNEY United States 2,841,974 Patented July 8, 1958 BOLT: LOCK Erich Hansel, Doberlng-Kirchhain, Germany Application March 23, 1954, Serial N 0. 418,042 2 -Claims.' (Gl; 7 -134) This invention relates to locks,; and more particularly to bolt locks, especially for articlesof furniture or the like.

An object of the invention is toreduce the parts of a lock to a minimum.

Another object ofthe inyentioniistto provide, a lock of a construction which,facilitatesthemounting ofithelock.

A further object of the invention is to provide a lock which may be manufactured at low costs.

Another object of the invention is to improve on the art of bolt locks as now customarily made.

Other objects and structural details will be apparent from the following description when read in conjunction with the accompanying drawing forming part of this specification, wherein:

Fig. 1 is a horizontal sectional view of a lock according to the invention mounted on the door of a cabinet,

Fig. 2 is a vertical sectional view of the lock shown in Fig. 1,

Fig. 3 is an elevational view of the sleeve for guiding the key as seen in the direction of the arrow III of Fig. 2,

Fig. 4 is a longitudinal sectional view of the lock with the bolt in an advanced and secured locking position,

Fig. 5 is a sectional view of the lock taken on line AB of Fig. 4, and

Fig. 6 is a longitudinal sectional view of the lock similar to that shown in Fig. 4, wherein, however, the bolt is in its retracted positon.

Referring now to the drawings, the lock comprises: the sleeve 1 for guiding the key 8, the cylindrical bolt 3, the sleeve 2, for guiding the bolt 3, the bolt catch 4, the spring 5, acting on the bolt catch 4, and the sleeve 6 for receiving the bolt 3 in locking position. The rear end of the sleeve 1 made of an artificial material, for example a plastic, by injection molding is provided with semi-circular safeguarding grooves 7 which are in accordance with the steps of the ward of the key 8. This simple arrangement replacing hitherto customary complicated safeguarding arrangements may be readily carried out in numerous variations by a corresponding shaping of the mold for the sleeve 1. The longitudinal axis of the sleeve 1 being offset to the longitudinal axis of the sleeve 2 extends in a direction perpendicular to the direction of the longitudinal axis of said sleeve 2.

The cylindrical bolt 3, likewise made of an artificial material, for example a plastic, has a slot-like recess 9. A bolt catch 4 in the shape of a double-armed bell-crank lever is inserted into said slot. 9. When the bolt 3 is in its advanced locking position as shown in Fig. 4, a spring 5 acting on the catch 4 urges a nose 10 on the long arm 4' of said catch 4 into engagement with a projection 11 on the casing sleeve 2. Thus, the catch 4 acts as safety means for preventing an unauthorized pushing back of the bolt 3 when the latter is in its advanced position. If it is desired to open the look by retracting the bolt 3, the catch 4 is swung out of its locking position by rotating the key 8 and urging its ward against the short arm 4" of the catch 4, so that, during a continuation of the rotation of the key 8 the tapered surfaces on .the right hand side of the catch 4 are moved into coincidencewiththe corre, sponding tapered surfaces in the bolt 3. The coinciding movement of the tapered surfaces on the catch4 with those in the bolt forces the catch to move, downwardly away from the ward'of the key and at, the sametime to rock the. catch bodily against the opposition of the spring 5 to disengage the nose 10 from the projectionllso that the bolt 3 may be moved without any obstruction. into the opening position shown in Fig. 6.

For the mounting of the lock on.the member 12, for example a door, the centers of the, bores receivingthe casing sleeve 2 and the sleevel for guiding the keys are fixed by a thorn templet in such a manner, that, after the drilling of the bores and the subsequent. cementing of said sleeves into said bores, the ward of the key 8 inserted into the sleeve 1 may extend into the recess 9 of the bolt 3' (see Figs. 2, 4 and 6). Preferably, the sleeve 2, like the sleeve 1, is made of a plastic or the like.

The center of the bore 16 arranged in the member 14, for example a wall of a-cabinet, may be readily fixed-by means of a small centering point 13 arranged on the end surface of the bolt 3. Preferably, a small amount of paint or other marking material is applied to said centering point 13 whereupon the bolt 3 is moved towards the member 14 for marking the center of the bore 16 by means of its point 13. After the drilling of the bore 16, the bolt receiving sleeve 6, preferably made of an artificial material such as a plastic, is cemented into the bore 16. The bolt 3 enters the sleeve 6 when it is in its advanced locking position shown in Fig. 4.

As will be readily understood from above, the loci: according to the invention comprises only a few elements, i. e. the sleeves 1, 2 and 6, the bolt 3, the catch 4 and the spring 5. Preferably, the sleeves 1, 2 and 6 are made of plastic material, so that they may be easily cemented into the respective members 12 and 14. The bolt 3, likewise, may be made of a plastic. The lock may be readily mounted in the members 12 and 14 upon drilling of three bores, the centers of which can be easily fixed. The safeguarding means 7 corresponding to the shape of the ward of the key 8 are arranged in the sleeve 1 for guiding the key, and the bolt 3 has a recess 9 for receiving the catch 4. Thus, the bolt lock according to the invention has considerably less parts than hitherto customary bolt locks and may be easily mounted on members to be locked.

I have described a preferred embodiment of my invention, but it is understood that this disclosure is for the purpose of illustration and that various omissions or changes in shape, proportion and arrangement of parts, as well as the substitution of equivalent elements for those, herein shown and described, may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

What I claim is:

1. A bolt lock for mounting in one of two relatively movable members, comprising a first sleeve capable of receiving a warded key, said first sleeve being arranged in a first bore of one of said members, a second sleeve for arrangement ina second bore of said one member, the longitudinal axes of the first and second sleeve being offset and extending in directions substantially perpendicular to each other, a bolt slidably arranged in said second sleeve, said bolt having a recess for engagement with the ward of the key, a longitudinal cavity defined in said bolt, a safety lever mounted in said cavity on a fulcrum for locking movement, said safety lever having a catch adjacent one end and an inclined surface at the other end, the catch being positioned to engage a portion of said second sleeve when said bolt is in advanced locking position, said bolt containing spring means urging said catch toward said sleeve portion, the end of said cavity adjacent safety lever by the ward of said key when the key is turned to retract the bolt, the inclined surface of said safety lever then sliding along the inclined wall of said cavity to permit rocking movement of said safety lever to bring the catch out of engagement with said sleeve portion.

2. In a bolt lock assembly, a bolt sleeve, a bolt slidably mounted in said sleeve for engagement by a warded key to move said bolt between an advanced, locking position and a retracted unlocking position, said bolt having a longitudinal cavity therein, said sleeve having a depending terminal projection extending into said cavity, a bowed leaf spring in said cavity and a safety lever contained in said cavity and resting upon said leaf spring, the safety lever being mounted in said cavity for rocking movement about an axis intermediate its ends, said safety lever having a catch adjacent one end and positioned to engage With said sleeve projection when said bolt is in advanced locking position to releasably maintain said bolt in said advanced position, said leaf spring urging said safety lever in a direction toward said sleeve projection, the end of said safety lever opposite said catch being positioned to be engaged by the ward of said key when said key is turned in a direction to retract the bolt, and to be moved by said key whereby said lever is rocked in a direction to bring the catch out of engagement with said sleeve projection, and said cavity having an inclined end Wall surface shaped to permit rearward sliding movement of the end of said safety lever opposite the catch in said cavity when said safety lever is engaged and moved by said key ward in retracting said bolt.

References Cited in the file of this patent UNITED STATES PATENTS 236,660 Post Jan. 11, 1881 408,688 Burgess Aug. 13, 1889 506,792 Nixholm Oct. 17, 1893 1,125,791 Aston Jan. 19, 1915 1,261,181 Tamburini Apr. 2, 1918 1,382,097 Larsen June 21, 1921 1,490,578 Bachmann Apr. 15, 1924 1,741,653 Palmer Dec. 31, 1929 2,499,165 Roethel Feb. 28, 1950 2,630,004 Welshons Mar. 3, 1953 FOREIGN PATENTS 290,818 Great Britain May 24, 1928 599,152 Great Britain Mar. 5, 1948 705,503 Germany Apr. 30, 1941

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