CN205036697U - Prevent quick -witted screw that simple instrument demolishd - Google Patents

Abstract

The utility model discloses a prevent quick -witted screw that simple instrument demolishd, by the epitheca, the inferior valve, four parts of spring and double -screw bolt are constituteed, epitheca and inferior valve threaded connection, the head end cylinder of double -screw bolt inserts in the last blind hole of epitheca, head end cylindrical up end top is on last blind hole up end, on the up end of middle part cylindrical up end top blind hole under, positive six prismatic lower extremes at the middle part are close to positive hexagon hole, the tail end cylinder is worn out from the second grade through -hole of inferior valve, the spring cup joints at the tail end cylinder, the upper end card of spring is at middle part positive six under prismatic on the terminal surface, its lower extreme card is on the lower terminal surface in positive hexagon hole. The utility model discloses in the installation or when demolising, must use make specially have a magnetic hexagonal sleeve, therefore can avoid ordinary simple instrument dismouting, be fit for having security requirements's occasion.

Description

The machine screw that a kind of anti-simple tool is removed

Technical field

The utility model relates to the machine screw that a kind of anti-simple tool is removed, and especially uses the machine screw that magnetic Hexagonal jacket could be installed or remove.

Background technique

Machine screw is used for being fastenedly connected between the part with interior threaded hole and the part with through hole, the extensive use because it is with low cost, easy to use.General machine screw can use simple tool (as flat mouth screw-driver, cross mouth screw-driver, hexagon wrench, inner hexagon spanner etc.) to install or remove.But for the instrument and apparatus that some are special, as electric energy meter, gas meter, be security consideration, its machine screw used is not wished can by simple tool dismounting, and the general machine screw existed at present cannot meet such demand.

Summary of the invention

For the specific demand existed at present, the utility model devises a kind of machine screw needing to use special tool(s) and specific process installation and removal, and the scheme taked is:

Be made up of upper casing, lower casing, spring and stud four parts, upper casing is the round column structure be made up of magnetic material, upwards has circular secondary blind hole vertically from bottom surface, wherein descends blind hole diameter to be greater than the diameter of blind hole, the hole wall of lower blind hole is provided with internal thread, and secondary blind hole is coaxial with upper casing; Lower casing is a cylinder, its middle and upper part is lower casing cylinder, bottom is positive six prisms of lower casing, the outer side wall of cylinder is provided with outside thread, lower casing has secondary through holes vertically, and the through hole being positioned at the positive six prism bottoms of lower casing is circular hole, and all the other are positive hexagon hole, the inscribed circle diameter in positive hexagon hole is greater than the diameter of circular hole, and secondary through holes is coaxial with lower casing; Stud is a cylinder, be made up of head end cylinder, middle part cylinder, positive six prisms in middle part and trailing cylindrical four sections of coaxial configurations, the outer side wall of trailing cylindrical is provided with outside thread, and head end cylinder and trailing cylindrical diameter are less than middle part cylinder, and the inscribed circle diameter of positive six prisms in middle part is greater than trailing cylindrical diameter; The upper blind hole diameter of upper casing is greater than head end body diameter, and lower blind hole diameter is greater than middle part body diameter, and the cross section of positive six prisms in middle part is less than the cross section in positive hexagon hole, and trailing cylindrical diameter is less than Circularhole diameter; Positive six prisms of lower casing are screwed in the lower blind hole of upper casing, upper casing and lower casing are threaded, the head end cylinder of stud inserts in the upper blind hole of upper casing upper casing, the upper-end surface of head end cylinder withstands on blind hole upper-end surface, the upper-end surface of middle part cylinder withstands on the upper-end surface of lower blind hole, the lower end of positive six prisms in middle part is near positive hexagon hole, trailing cylindrical passes from the secondary through holes of lower casing, spring housing is connected on trailing cylindrical, the upper end of spring is stuck on positive six prism lower end surfaces, middle part, and its lower end is stuck on the lower end surface in positive hexagon hole.

The utility model, when installing or remove, must use special magnetic six square sockets of band made, therefore can avoid common simple tool dismounting, be applicable to the occasion having demand for security.

Accompanying drawing explanation

Fig. 1 is semi-section schematic diagram of the present utility model;

Fig. 2 is the utility model assembly relation schematic diagram.

Embodiment

Below in conjunction with drawings and Examples, the utility model is described further:

As depicted in figs. 1 and 2, upper casing 1 is the round column structure be made up of magnetic material, upwards has circular secondary blind hole vertically from bottom surface, wherein descends blind hole 12 diameter to be greater than the diameter of blind hole 11, the hole wall of lower blind hole 12 is provided with internal thread, and secondary blind hole is coaxial with upper casing 1, lower casing 4 is a cylinder, its middle and upper part is lower casing cylinder 41, bottom is positive six prisms 42 of lower casing, the outer side wall of cylinder 41 is provided with outside thread, lower casing 4 has secondary through holes vertically, and the through hole being positioned at positive six prism 42 bottoms of lower casing is circular hole 44, and all the other are positive hexagon hole 43, the inscribed circle diameter in positive hexagon hole 43 is greater than the diameter of circular hole 44, and secondary through holes is coaxial with lower casing 4, stud 2 is a cylinder, be made up of head end cylinder 21, middle part cylinder 22, positive six prisms 23 in middle part and trailing cylindrical 24 4 sections of coaxial configurations, the outer side wall of trailing cylindrical 24 is provided with outside thread, head end cylinder 21 and trailing cylindrical 24 diameter are less than middle part cylinder 22, and the inscribed circle diameter of positive six prisms 23 in middle part is greater than trailing cylindrical 24 diameter, upper blind hole 11 diameter of upper casing 1 is greater than head end cylinder 21 diameter, and lower blind hole 12 diameter is greater than middle part cylinder 22 diameter, and the cross section of positive six prisms 23 in middle part is less than the cross section in positive hexagon hole 43, and trailing cylindrical 24 diameter is less than circular hole 44 diameter, positive six prisms 42 of lower casing are screwed in the lower blind hole 12 of upper casing 1, upper casing 1 and lower casing 4 are threaded, the head end cylinder 21 of stud 2 inserts in the upper blind hole 11 of upper casing upper casing 1, the upper-end surface of head end cylinder 21 withstands on blind hole 11 upper-end surface, the upper-end surface of middle part cylinder 22 withstands on the upper-end surface of lower blind hole 12, the lower end of positive six prisms 23 in middle part is near positive hexagon hole 43, trailing cylindrical 24 passes from the secondary through holes of lower casing 4, spring 3 is socketed in trailing cylindrical 24, the upper end of spring 3 is stuck on positive six prism 23 lower end surfaces, middle part, its lower end is stuck on the lower end surface in positive hexagon hole 43.

When in use, first this machine screw is screwed in fastener screw hole one to two to enclose, then magnetic sleeve is put, to help pull a cart laterally gently cylinder, can not be separated with magnetic sleeve because magnetic force changes machine screw, and magnetic force meeting Compress Spring 3, positive six prisms 23 in middle part are made to insert positive hexagon hole 43, then relatively rotating of lower casing 4 and stud 2 is limited, then turnbarrel, makes machine screw continue to enter screw hole, until tighten, the lower end surface of middle part cylinder 22 withstands on the upper-end surface of lower casing cylinder 41 simultaneously, and positive six prisms 23 of limiting unit insert the degree of depth in positive hexagon hole 43.When ordinary cartridge installs this machine screw, can only press downwards, positive six prisms 23 in middle part can not insert positive hexagon hole 43, now turnbarrel, and the meeting of lower casing 4 and stud 2 relatively rotates, and make machine screw can not continue to enter screw hole, therefore cannot tighten.

When dismounting, along with the rotation of machine screw, stud 2 exits gradually from screw hole, and due to the effect of spring 3, positive six prisms 23 in middle part can exit gradually from positive hexagon hole 43.Now, if use ordinary cartridge, the meeting of lower casing 4 and stud 2 relatively rotates, and stud 2 stops operating, and can not continue to exit from screw hole, and thus machine screw cannot be pulled down completely.If use magnetic sleeve, to help pull a cart laterally gently cylinder, because magnetic force machine screw can not be separated with sleeve, and magnetic force meeting Compress Spring 3, make positive six prisms 23 in middle part insert positive hexagon hole 43, then limit relatively rotating of lower casing 4 and stud 2, continue turnbarrel, machine screw is made to continue to exit screw hole, until remove completely.

Claims (1)

1. the machine screw of an anti-simple tool dismounting, be made up of upper casing (1), lower casing (4), spring (3) and stud (2) four parts, it is characterized in that: upper casing (1) is the round column structure be made up of magnetic material, circular secondary blind hole is upwards had vertically from bottom surface, blind hole (12) diameter is wherein descended to be greater than the diameter of blind hole (11), the hole wall of lower blind hole (12) is provided with internal thread, and secondary blind hole is coaxial with upper casing (1), lower casing (4) is a cylinder, its middle and upper part is lower casing cylinder (41), bottom is positive six prisms (42) of lower casing, the outer side wall of cylinder (41) is provided with outside thread, lower casing (4) has secondary through holes vertically, and the through hole being positioned at lower casing positive six prisms (42) bottom is circular hole (44), and all the other are positive hexagon hole (43), the inscribed circle diameter of positive hexagon hole (43) is greater than the diameter of circular hole (44), and secondary through holes is coaxial with lower casing (4), stud (2) is a cylinder, be made up of head end cylinder (21), middle part cylinder (22), positive six prisms (23) in middle part and trailing cylindrical (24) four sections of coaxial configurations, the outer side wall of trailing cylindrical (24) is provided with outside thread, head end cylinder (21) and trailing cylindrical (24) diameter are less than middle part cylinder (22), and the inscribed circle diameter of positive six prisms (23) in middle part is greater than trailing cylindrical (24) diameter, upper blind hole (11) diameter of upper casing (1) is greater than head end cylinder (21) diameter, lower blind hole (12) diameter is greater than middle part cylinder (22) diameter, the cross section of positive six prisms (23) in middle part is less than the cross section of positive hexagon hole (43), and trailing cylindrical (24) diameter is less than circular hole (44) diameter, positive six prisms (42) of lower casing are screwed in the lower blind hole (12) of upper casing (1), upper casing (1) and lower casing (4) are threaded, the head end cylinder (21) of stud (2) inserts in the upper blind hole (11) of upper casing upper casing (1), the upper-end surface of head end cylinder (21) withstands on blind hole (11) upper-end surface, the upper-end surface at middle part cylinder (22) withstands on the upper-end surface of lower blind hole (12), the lower end of positive six prisms (23) in middle part is near positive hexagon hole (43), trailing cylindrical (24) passes from the secondary through holes of lower casing (4), spring (3) is socketed in trailing cylindrical (24), the upper end of spring (3) is stuck on positive six prisms (23) lower end surface, middle part, its lower end is stuck on the lower end surface of positive hexagon hole (43).