Device for securing articles on a mounting base

Claim 1

A device for locking a holding bolt engaged with an article such as a typewriter, radio set, etc., for securing the article on a mounting base to prevent pilfering thereof, comprising a first tubular member having an end wall with a substantially flat exterior face adapted to be positioned against a mounting base for the article and having an opening through said end wall of a size to permit passage of a bolt therethrough, said first tubular member including a large diameter base portion and an inner tubular part spaced inwardly from said base portion and an annular groove formed between said base portion and said inner tubular part, said first tubular member having a lock projection on each diametrically opposite side, a second tubular member adapted to cover said first tubular member and having an end which is engageable in the annular groove, said second tubular member having an accommodating recess at each side for each lock projection on said first tubular member and having the laterally extending locking recess for said projection extending inwardly in respective opposite lateral directions from each associated accommodating recess, said second tubular member being positionable to engage in the accommodating recess with the lock projections in the accommodating receSs and being rotatable to lock said lock projections behind said locking recess, said second tubular member having a locking tumbler extending centrally inwardly into the interior of said tubular part and having at least one extendible and retractable holding projection, a key engageable in said locking tumbler and being adapted to retract said holding projection inwardly into said tumbler upon insertion thereof, said first tubular member having an axially extending groove accommodating said tubular projection, and locking said outer tubular part in respect to rotation to said inner tubular part, said projection being movable inwardly to permit rotation of said outer tubular part relative to said inner tubular part when the key is inserted.

Claim 2

A device for locking a holding bolt engaged with an article such as a typewriter, radio set, etc., for securing the article on a mounting base to prevent pilfering thereof, comprising a first tubular member having an end wall with a substantially flat exterior face adapted to be positioned against a mounting base for the article and having an opening through said end wall of a size to permit passage of a bolt therethrough, said first tubular member including a large diameter base portion and an inner tubular part spaced inwardly from said base portion and an annular groove formed between said base portion and said inner tubular part, said first tubular member having a lock projection on each diametrically opposite side, a second tubular member adapted to cover said first tubular member and having an end which is engageable in the annular groove, said second tubular member having an accommodating recess at each side for each lock projection on said first tubular member and having the laterally extending locking recess for said projection extending inwardly in respective opposite lateral directions from each associated accommodating recess, said second tubular member being positionable to engage in the accommodating recess with the lock projections in the accommodating receSs and being rotatable to lock said lock projections behind said locking recess, said second tubular member having a locking tumbler extending centrally inwardly into the interior of said tubular part and having at least one extendible and retractable holding projection, a key engageable in said locking tumbler and being adapted to retract said holding projection inwardly into said tumbler upon insertion thereof, said first tubular member having an axially extending groove accommodating said tubular projection, and locking said outer tubular part in respect to rotation to said inner tubular part, said projection being movable inwardly to permit rotation of said outer tubular part relative to said inner tubular part when the key is inserted.

Claim 3

A device for locking a holding bolt engaged with an article such as a typewriter, radio set, etc., for holding the article on a mounting base to prevent withdrawal and pilfering thereof, comprising a first tubular member having an end wall with a substantially flat exterior face adapted to be positioned against a mounting base for the article and having an opening through said end wall of a size to permit passage of a bolt therethrough, and a second tubular member of a size to fit over said first tubular member and cover it and the end of the securing bolt so that it may not be unloosened, said first and second tubular members having bayonet-type interengageable portions which may be engaged and disengaged by relative rotation of said second tubular part relative to said first tubular member, and means for locking said first and second tubular members against relative rotation, said locking means including an interior cylinder carried on said second tubular member which fits into the interior of said first tubular member, and projection means thereon engageable outwardly from said interior cylinder upon removal of a key therefrom, said first tubular member having an interior with a recess for accommodating said projection means to permit axial movement of said parts relative to each other but preventing the rotation thereof when said projection means extend outwardly, and having an integral widened base portion and an upstanding tubular part extending outwardly from said base portion and a protective annular base portion surrounding said projection means and defining an annular groove in said base portion, said second tubular member fitting into the annular groove of said first member, said projection means including a locking projection extending outwardly from each side of said tubular part of said first tubular member, said second tubular member having an entering recess and a lateral locking recess, said locking projection fitting into said recess and forming with said locking recess an engageable bayonet joint, said first and second tubular members being rotatable to position the projection of said first tubular member into the locking recess of said second tubular member in a locked position.

Claim 4

A device for locking a holding bolt engaged with an article such as a typewriter, radio set, etc., for holding the article on a mounting base to prevent withdrawal and pilfering thereof, comprising a first tubular member having an end wall with a substantially flat exterior face adapted to be positioned against a mounting base for the article and having an opening through said end wall of a size to permit passage of a bolt therethrough, and a second tubular member of a size to fit over said first tubular member and cover it and the end of the securing bolt so that it may not be unloosened, said first and second tubular members having bayonet-type interengageable portions which may be engaged and disengaged by relative rotation of said second tubular part relative to said first tubular member, and means for locking said first and second tubular members against relative rotation, said locking means including an interior cylinder carried on said second tubular member which fits into the interior of said first tubular member, and projection means thereon engageable outwardly from said interior cylinder upon removal of a key therefrom, said first tubular member having an interior with a recess for accommodating said projection means to permit axial movement of said parts relative to each other but preventing the rotation thereof when said projection means extend outwardly, and having an integral widened base portion and an upstanding tubular part extending outwardly from said base portion and a protective annular base portion surrounding said projection means and defining an annular groove in said base portion, said second tubular member fitting into the annular groove of said first member, said projection means including a locking projection extending outwardly from each side of said tubular part of said first tubular member, said second tubular member having an entering recess and a lateral locking recess, said locking projection fitting into said recess and forming with said locking recess an engageable bayonet joint, said first and second tubular members being rotatable to position the projection of said first tubular member into the locking recess of said second tubular member in a locked position.