A shaft coupling device includes a first portion, a second portion, a pair of buttons, a biasing member, and at least one button stop. The first portion has a female couple section and a first device mounting section. The second portion has a male couple section and a second device mounting section. The male couple section is configured so as to be receivable within the cavity of the female couple section. The biasing member, the button stop, and at least a portion of the first and second buttons are disposed within the second cavity of the male couple section, with the biasing member disposed between the buttons, biasing the buttons radially outwardly. The button stop limits the radially inward travel of the buttons.

A driving head-changeable tool includes an outer sleeve, an inner sleeve and a limitation mechanism. The outer sleeve defines a central axis and has an end peripheral edge having corner portions and blocking flanges therebetween and a circumferential sliding slot. The inner sleeve is rotatably sleeved by the outer sleeve and has first and second connecting ends. The first connecting end has axial concaves. The limitation mechanism is mounted to the inner sleeve and extends into and movable relative to the sliding slot. When the limitation mechanism is located in a lock position, the outer and inner sleeves are unrotatable relative to each other and each concave overlaps axially with one of the blocking flanges; when the limitation mechanism is located in a release position, the outer and inner sleeves are rotatable relative to each other and each concave corresponds to one of the corner portions.

Cable coupling assemblies are described which can be readily engaged and separated from one another. The couplings are particularly useful for use in torque transmitting cables such as those used in drain cleaning applications.