An all-plastic, tumbler-free cam lock includes a cylindrical lock body with a flange extending radially from the distal end to be glued to a surface surrounding a mounting hole. The lock body has a bore extending axially and a central spindle received coaxially in the bore. A key has a cylindrical t
An all-plastic, tumbler-free cam lock includes a cylindrical lock body with a flange extending radially from the distal end to be glued to a surface surrounding a mounting hole. The lock body has a bore extending axially and a central spindle received coaxially in the bore. A key has a cylindrical tubular key body insertable concentrically between the lock body shoulder and the distal end of the spindle. A pair of outer key lugs extend radially outwardly from the tubular key body to pass through the key channels of an interior shoulder of the lock body, thus permitting access only by one key configuration. A third key lug extends radially inwardly from the inner surface of the tubular key body to engage a keyway channel of the spindle.
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1. A tumbler-free cam lock for securing a moving closure with respect to a fixed frame, including: a lock body having a bore extending along an axis therethrough, and an interior shoulder disposed at a distal end of said bore and extending radially inwardly to define a narrow distal opening;at least
1. A tumbler-free cam lock for securing a moving closure with respect to a fixed frame, including: a lock body having a bore extending along an axis therethrough, and an interior shoulder disposed at a distal end of said bore and extending radially inwardly to define a narrow distal opening;at least one key channel extending through said interior shoulder parallel to said axis;a central spindle extending axially in said bore in rotatable fashion, said spindle including a distal portion extending axially and distally and configured to be received within said narrow distal opening and define an annular gap therebetween;a key having a tubular key body dimensioned to be received in said annular gap, said key including at least one outer key lug extending radially outwardly therefrom and positioned to slidably extend through said at least one key channel;further including a semi-helix split washer locking device extending about said distal portion of said spindle and disposed coaxially within said bore and said lock body. 2. The cam lock of claim 1, further including a keyway channel extending longitudinally in said distal portion of said spindle parallel to the axis, and further including an inner key lug extending radially inwardly from said tubular key body and disposed to engage slidably in said keyway channel of said distal portion of said spindle. 3. The cam lock of claim 2, wherein said inner key lug and at least one of said outer key lugs are radially aligned with respect to the axis. 4. The cam lock of claim 1, wherein said spindle includes a proximal portion within said bore, and a pin channel formed in an exterior surface of said proximal portion of said spindle and extending in a plane perpendicular to the axis. 5. The cam lock of claim 4, further including a lock pin extending inwardly through said lock body into said pin channel to secure said spindle in said lock body. 6. The cam lock of claim 5, wherein said pin channel subtends an angle of about 90° with respect to the axis, and said lock pin limits rotation of said spindle to said subtended angle. 7. The cam lock of claim 1, wherein said spindle further includes a proximal neck portion projecting axially and proximally from said bore of said lock body, and a lock cam configured to engage said neck portion and extend radially therefrom beyond the radial extent of said lock body. 8. The cam lock of claim 7, wherein said lock cam includes snap engagement means for releasably engaging said proximal neck portion. 9. The cam lock of claim 7, further including an end plate secured to a proximal end of said spindle and defining an annular space between said end plate and said proximal portion of said spindle, said lock cam being engaged in said annular space. 10. The cam lock of claim 9, wherein said end plate includes a cutout portion extending into an edge portion thereof, and further including a cam pin extending from said lock cam parallel to the axis and disposed to be engaged in said cutout portion. 11. The cam lock of claim 1, further including an annular flange extending radially outwardly from the distal end of said lock body, said flange having a proximal annular face. 12. The cam lock of claim 1, wherein said spindle includes a keyway channel extending longitudinally in said distal portion of said spindle, and further including an inner washer lug extending radially inwardly from said semi-helix split washer locking device and disposed to engage in said keyway channel of said distal portion of said spindle. 13. The cam lock of claim 12, wherein said spindle includes a proximal portion wider than said distal portion, and an annular shoulder disposed between said proximal and distal portions of said spindle. 14. The cam lock of claim 13, wherein said semi-helix split washer locking device includes a first semi-cylindrical portion extending annularly in a plane perpendicular to the axis and disposed to impinge on said annular shoulder of said spindle. 15. The cam lock of claim 14, wherein said semi-helix split washer locking device includes a second portion extending from said first portion and describing a helical annulus defining about one-half of a helix extending about the axis and forming an annular leaf spring. 16. The cam lock of claim 15, wherein said semi-helix split washer locking device includes a plurality of tabs projecting from a proximal face thereof and spaced angularly about said axis, and a plurality of receptacles formed in said annular shoulder of said spindle, said receptacles being positioned and configured to engaged said tabs in complementary, interfitted relationship to maintain angular alignment of said spindle and said semi-helix split washer locking device. 17. The cam lock of claim 15, further including a washer lug formed at a free end of said annular leaf spring, said washer lug extending into said annular gap and positioned to be impinged upon by a proximal edge of said tubular key body when said key is inserted in said annular gap. 18. The cam lock of claim 1, further including a lock cam removably secured to said spindle and extending radially outwardly therefrom to engage an adjacent structure and secure said moving closure. 19. The cam lock of claim 18, wherein said lock body, central spindle, lock cam, and key are all formed of molded plastic material. 20. The cam lock of claim 19, further including a lock pin joining said lock body and central spindle, said cam lock being comprised exclusively of said lock body, central spindle, lock cam, lock pin, and key. 21. The cam lock of claim 1, further including a pair of said outer key lugs extending from said tubular key body at a predetermined angular separation, and a pair of said key channels extending through said interior shoulder at said predetermined angular separation to accept only keys having said outer key lugs predetermined angular separation.
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