(19)
(11)EP 2 843 247 A1

(12)EUROPEAN PATENT APPLICATION

(43)Date of publication:
04.03.2015 Bulletin 2015/10

(21)Application number: 14190623.0

(22)Date of filing:  06.08.2008
(51)Int. Cl.: 
F16B 23/00  (2006.01)
E05D 5/12  (2006.01)
F16B 35/04  (2006.01)
F16B 31/02  (2006.01)
E05D 3/02  (2006.01)
(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

(30)Priority: 06.08.2007 US 963519 P
14.09.2007 US 993726 P

(62)Application number of the earlier application in accordance with Art. 76 EPC:
08782656.6 / 2174023

(71)Applicant: Tedeschi, Nancy
Rexford, NY 12148-1642 (US)

(72)Inventor:
  • Tedeschi, Nancy
    Rexford, NY 12148-1642 (US)

(74)Representative: McIlroy, Steven David et al
Cameron Intellectual Property Ltd 69 St. Vincent Street
Glasgow G2 5TF
Glasgow G2 5TF (GB)

 
Remarks:
This application was filed on 28-10-2014 as a divisional application to the application mentioned under INID code 62.
Remarks:
Claims filed after the date of receipt of the divisional application (Rule 68(4) EPC).
 


(54)Screw with breakaway and methods of using same


(57) The invention relates to a hand-held screw (10) adapted to be easily manipulated by a user during insertion into an intended screw hole (100). The screw comprises an elongated stem (11) having a threaded and non-threaded portion (20, 30). A breakaway (25) releasably couples the non-threaded portion (30) to the distal end (C) of the threaded portion (20). The non-threaded portion has a diameter (W3) smaller than a diameter (W2) of the threaded portion to facilitate its insertion into a screw hole (100). The length (L2-L1) of the non-threaded portion (30) is greater than the length (L1) of the threaded portion (20) thereby facilitating grasping and manipulation thereof by a user on entry of the threaded first portion into a screw hole (100). The breakaway (25) is removable on complete insertion of the screw into the screw hole (100) by braking or cleaving.




Description

1. Field of the Invention



[0001] The present invention relates generally to fasteners. More specifically, the invention relates to screws and their use in joints.

2. Background



[0002] Small, hand held fastening devices are used in the mechanical and construction industries.

[0003] There is an increasing need for adaptations that facilitate the manipulation of such small, hand held fastening devices.

Summary of the Invention



[0004] A first aspect of the present invention provides a screw, comprising: a screw head, comprising: a first surface having a driver slot thereon, and a second surface, wherein the second surface of the screw head faces away from the first surface; an elongated stem, comprising: either a threaded first portion and a non-threaded second portion extending from the distal end of the threaded first portion and a first breakaway therebetween, wherein a proximal end of the threaded first portion is mechanically and physically coupled to the second surface of the screw head, wherein the physical coupling between the second surface of the screw head and the proximal end of the threaded first portion is not a breakaway, wherein the first breakaway releasably couples the non-threaded second portion to the distal end of the threaded first portion, or a threaded first portion, without the non-threaded second portion extending from the threaded first portion and a second breakaway, wherein a proximal end of the threaded first portion is non- releasably mechanically and physically coupled to the second surface of the screw head, wherein the mechanical and physical coupling between the second surface of the screw head and the proximal end of the threaded first portion is not a breakaway, and wherein the second breakaway releasably couples the first surface of the screw head to a breakaway tab.

[0005] A second aspect of the present invention provides a method of replacing a screw in a hinge, comprising: providing a hinge, comprising : first and second straps, pivotably coupled to a cylinder, wherein the cylinder has a threaded hollow channel therein; providing a screw comprising: a head; an elongated stem comprising: either a threaded first portion adjacent to the head; and a non-threaded second portion extending from the threaded first portion; and a first breakaway therebetween, wherein the first breakaway releasably couples the non-threaded second portion to the distal end of the threaded first portion, or a threaded first portion adjacent to the head without the non-threaded second portion extending from the threaded first portion and a second breakaway, wherein the second breakaway releasably couples the first surface of the screw head to a breakaway tab;inserting the non-threaded second portion of the elongated stem into the hollow threaded channel in the hinge so that the non-threaded second portion of the elongated stem extends out of the hollow threaded channel of the hinge; or inserting the threaded portion of the elongated stem into the hollow threaded channel in the hinge by a user manipulating the insertion using the breakaway tab; aligning the threaded first portion of the elongated stem with the threads of the hollow threaded channel of the hinge; and screwing the first threaded portion of the elongated stem into the hollow threaded channel of the hinge by rotating the threaded first portion of the elongated stem that has been aligned with the threads of the threaded hollow channel of the hinge.

[0006] A third aspect of the present invention provides a kit, comprising: a hinge, comprising first and second straps, pivotably coupled to a cylinder, wherein the cylinder has a threaded hollow channel therein; a screw, comprising: a head; an elongated stem, comprising: either a threaded first portion adjacent to the head and a non-threaded second portion extending from the threaded first portion and a first breakaway therebetween, wherein the first breakaway releasably couples the first threaded portion of the elongated stem to the non-threaded second portion of the elongated stem, wherein the non-threaded second portion of the elongated stem has been aligned with the hollow threaded channel in the hinge, and wherein the non-threaded second portion of the elongated stem has been inserted into the hollow threaded channel in the hinge so that the threaded first portion of the elongated stem catches at least one of the threads of the hollow threaded channel of the hinge; or a threaded first portion physically and mechanically non-releasably coupled to the second surface of the screw head without the non-threaded second portion extending from the threaded first portion and a second breakaway, wherein the second breakaway releasably couples the first surface of the screw head to a breakaway tab,wherein the proximal end of the threaded portion and the second surface of the screw head are non-releasably coupled, and wherein the threaded first portion of the elongated stem has caught at least one thread of the hollow threaded channel of the hinge, by threading the threads of the first portion of the elongated stem with the threads of the hollow threaded channel.

[0007] A fourth aspect of the present invention provides a system for guiding a screw into a hinge, comprising: a hinge, wherein the hinge has a hollow channel therein; a screw, comprising: a head; an elongated stem, comprising: a threaded first portion adjacent to the head; and a non-threaded second portion extending from the threaded first portion; and a breakaway, wherein the breakaway is removably connected therebetween or removably connected to the first surface of the screw head, but the breakaway is not removably connected between the threaded first portion of the elongated stem and the head of the screw, wherein the non-threaded second portion of the elongated stem has been aligned with the hollow threaded channel in the hinge, wherein the non-threaded second portion of the elongated stem has been manipulated into the threaded hole in the hinge so that the threaded first portion of the elongated stem is articulated with the threads of the hollow threaded channel of the hinge, and wherein the screw has been inserted into the threaded first portion of the elongated stem by threading the threads of the first portion of the elongated stem with the threads of the threaded hole.

Brief Description of the Figures



[0008] 

Fig. 1A depicts a top plan view of a first surface of a screw head of a screw, in accordance with embodiments of the present invention;

Fig. 1B depicts a longitudinal cross-sectional view of the screw depicted in Fig. 1A, in accordance with embodiments of the present invention;

Fig. 2A depicts a front longitudinal view of a screw, in accordance with embodiments of the present invention;

Fig. 2B depicts a top plan view of a first surface of a screw head of the screw depicted in Fig. 2A, in accordance with embodiments of the present invention;

Fig. 3A depicts a side elevation view of the screw the screw depicted in Figs. 2A and 2B, in accordance with embodiments of the present invention;

Fig. 3B depicts a top plan view of a first surface of a screw head of the screw depicted in Figs. 2A, 2B, and 3A, in accordance with embodiments of the present invention;

Fig. 4 depicts a longitudinal cross-sectional view of a kit, in accordance with embodiments of the present invention;

Fig. 5 depicts a top plan view of a screw having a screw head, in accordance with embodiments of the present invention; and

Figs. 6A - 6C depict a flow diagram of a method of replacing a screw in a hinge of the kit, depicted in Fig. 4, in accordance with embodiments of the present invention.


Detailed Description of Embodiments of the Invention



[0009] Fig. 1A depicts a top plan view of a first surface 19 of a screw head 15 of a screw 10. The screw head 15 includes a driver slot 17. The screw 10 may be a round head 15 made of stainless steel, brass, nickel/sliver, carbon steel, titanium, or other appropriate metals or metal alloys. The driver slot 17 may be a single groove, a Phillips® cross shaped groove, an hexagonal groove for turning with a hex wrench.

[0010] Fig. 1B depicts a longitudinal cross-sectional view of the screw 10. The screw 10, comprises: the screw head 15, comprising: a first surface 19 having a driver slot 17 thereon, and a second surface 18, wherein the second surface 18 of the screw head 15 faces away from the first surface 19. The screw 10 comprises an elongated stem 11. The elongated stem 11 comprises a threaded first portion 20. A proximal end A of the threaded first portion 20 is mechanically and physically coupled to the second surface 18 of the screw head 15. The mechanical and physical coupling between the second surface 18 of the screw head 15 and the proximal end A of the threaded first portion 20 is not a breakaway 25, 43. The elongated stem 11 comprises a non-threaded second portion 30 extending from a distal end C of the threaded first portion 20; and a breakaway 25 therebetween.

[0011] Hereinafter, a "breakaway" is defined as a releasable coupling between a removable piece such as the proximal end 12 of the non-threaded second portion 20 and the distal end C of the threaded first portion 20. Hereinafter, "distal end" is defined as the further point along the elongated stem 11 in reference to the second surface 18 of the screw head 15, and "proximal" is defined as the nearer point along the elongated stem 11 in reference to the second surface 18 of the screw head 15.

[0012] Hereinafter "releasably coupling" is defined as forming or braking or cleaving or severing a mechanical and physical coupling between the removable piece such as the proximal end 12 of the non-threaded second portion 20 and the distal end C of the threaded first portion 20.

[0013] Hereinafter "screwing the screw 10, 13 into a screw hole 59, 100 or threaded hollow channel of a hinge 64" is defined as engaging the threads 63 in the screw hole 59, 100 or hollow threaded channel 64 of a hinge 66, by rotating the screw 10, 13 about its longitudinal axis in a clockwise motion, resulting in the screw 10, 13 being essentially completely inserted into the screw hole 59, 100 or hollow threaded channel 64 of the hinge 66. Such engaging the threads 63 in the screw hole or hollow threaded channel 64 has the ultimate end that the screw 10, 13 has been essentially completely inserted into the screw hole 59, 100.

[0014] In one embodiment, the screw 10 comprises a non-threaded first portion 30 for making it easier to handle the screw 10. You insert the non-threaded first portion 30 of the screw 10 into a screw hole 100 first and then you are able to pull the threaded second portion 20 of the screw 10 into the screw hole 100 as the non-threaded second portion 30 is removed from the screw hole 100. This adapts the screw 10 to be more easily manipulated by hand by a user.

[0015] In one embodiment, a length L1 from about 0.3375 in. to about 0.4125 in. may separate the proximal end A of the threaded first portion 20 and the distal end C of the threaded first portion 20.

[0016] In one embodiment, a length L2 from about .6973 in. to about 0.8525 in. may separate the proximal end A of the threaded first portion 20 and the distal end B of the non-threaded second portion 30 of the elongated stem 11.

[0017] In one embodiment, a diameter W3 of the non-threaded second portion is preferably smaller than a diameter W2 of the threaded first portion 20 of the elongated stem 11. In one embodiment the diameter W3 is from about 0.036 in. to about 0.044 in.

[0018] Fig. 2A depicts a front longitudinal view of a screw 13. The screw 13 comprises: a screw head 50 and an elongated stem 14. The screw head 50, comprises: a first surface 44 having a driver slot 51 thereon. The screw head 50, comprises a second surface 48, depicted in Fig. 3A and described in associated text. The second surface 48 of the screw head 50 faces away from the first surface 44. The elongated stem 14, comprises: either a threaded first portion 20 and a non-threaded second portion 30 extending from the distal end C of the threaded first portion 20 and a first breakaway 25 therebetween, depicted in Fig. 1B, or a threaded first portion 42, without the non-threaded second portion 30, depicted in Fig. 1B, extending from the threaded first portion 42 and a second breakaway 43. A proximal end E of the threaded first portion 42 is non-releasably coupled to the second surface 48 of the screw head 50. The mechanical and physical coupling between the second surface 48 of the screw head 50 and the proximal end E of the threaded first portion 42 is not a breakaway 25, 43. In this embodiment, the first breakaway 25 releasably couples the non-threaded second portion 30 to the distal end C of the threaded first portion 20.

[0019] In an alternative embodiment the threaded first portion 20, without the non-threaded second portion 30 extends from the threaded first portion 20 and a second breakaway 43. In this embodiment, a proximal end E of the threaded first portion 20 is non- releasably mechanically and physically coupled to the second surface 48 of the screw head 50. In this embodiment, the mechanical and physical coupling between the second surface 48 of the screw head 50 and the proximal end E of the threaded first portion 20 is not a breakaway 25, 43. In addition, the second breakaway 43 releasably couples the first surface 48 of the screw head 50 to a breakaway tab 45.

[0020] In one embodiment, a screw 13 with a break away tab 45 on the screw head 50 guides screws 13 into a screw hole for easy maneuverability. Any size screw 13, or break away tab 45 may be placed anywhere on the head 50 of the screw 13. Insert the screw 13 in hole 59, turn the break away tab 45 to start the screwing operation and then break the break away tab 45 off.

[0021] In one embodiment, a length L5 from the second surface 48 to the second breakaway 43, releasably coupling the breakaway tab 45, may be from about 0.1 in. to about 0.21 in.

[0022] In one embodiment, a width W7 of the breakaway tab 45 may be from about 0.225 in. to about 0.275 in. and a length L3 of the breakaway tab 45 may be from about 0.45 in. to about 0.55 in.

[0023] Fig. 2B depicts a top plan view of a first surface 44 of a screw head 50 of the screw 13. The screw head 50 includes a driver slot 51. The screw 13 may be made of stainless steel, brass, nickel/sliver, carbon steel, titanium, or other appropriate metals or metal alloys. The driver slot 51 may be a single groove, a Phillips® cross shaped groove, or an hexagonal groove for turning with a hex wrench.

[0024] Fig. 3A depicts a side elevation view of the screw 13. In one embodiment, a length L4 from the proximal end E of the threaded first portion 20 to the distal end F of the threaded first portion of the elongated stem 14 may be from about 0.3942 in. to about 0.4818 in.

[0025] In one embodiment, a face 49 of the breakaway tab 45 and a longitudinal plane of the driver slot 51 are parallel. A width W8 of the driver slot 51 may be from about 0.045 in. to about 0.055 in. A ratio of the thickness L9 of the breakaway tab 45 of the screw 13 to the width W8 of the driver slot 51 is from about 0.3:1.0 to about 0.4:0.9.

[0026] In one embodiment, a ratio of the length L1 of the threaded first portion 20 to the non-threaded second portion 30 of the screw 10 is from about 1:1 to about 0.775:1.

[0027] In one embodiment, a diameter of the first breakaway 25 of the screw 10 is less than or equal to 0.015 in., when the diameter of the elongated stem 11 is essentially equal to 0.040 in.

[0028] In one embodiment, a ratio of the width W1 of the breakaway tab 45 to a length L3 of the breakaway tab 45 is from about 1:2 to about 1:10.

[0029] In one embodiment, the screw head 50 is a slotted undercut oval countersunk head.

[0030] In one embodiment, the threaded first portion 42 has a 6-32 UNF thread, wherein conventional UNC or UNF thread is a 60 degree thread.

[0031] In one embodiment, a ratio of the length L4 of the threaded first portion 42 to the length L3 of the breakaway tab 45 of the screw 10 is from about 1:1 to about 0.876:1.

[0032] Fig. 3B depicts a top plan view of a first surface 44 of a screw head 51 of the screw 50. In one embodiment, a width W1 of the second breakaway 43 across the first surface 44 of the screw head 50, depicted in Fig. 2B, is from about 75% to about 95% of the length L10 of the driver slot 51 thereon.

[0033] Fig. 4 depicts a longitudinal cross-sectional view of a kit 65. In one embodiment, the kit 65 comprises: a hinge 66, comprising first and second straps 60, 61, pivotably coupled to a cylinder 62. The cylinder 62 has a hollow threaded channel 64 therein. The kit 65 comprises: a screw 10, comprising: a head 19 and an elongated stem 11. The elongated stem 11, comprises: either a threaded first portion 20 adjacent to the head 15 and a non-threaded second portion 30 extending from the threaded first portion 20 and a first breakaway 25 therebetween. The first breakaway 25 releasably couples the threaded first portion 20 of the elongated stem 11 to the non-threaded second portion 30 of the elongated stem 11. The non-threaded second portion 30 of the elongated stem 11 has been aligned with the hollow threaded channel 64 in the hinge 66. The non-threaded second portion 30 of the elongated stem 11 has been inserted into the hollow threaded channel 64 in the hinge 66 so that the threaded first portion 20 of the elongated stem 11 catches at least one of the threads 63 of the hollow threaded channel 64 of the hinge 66.

[0034] Alternatively, the kit 65 comprises; a screw 13, depicted in Figs 2A, 2B, and Figs. 3A, 3B. The screw 13 comprises: a screw head 50 and an elongated stem 14.

[0035] The elongated stem 14 comprises a threaded first portion 42 physically and mechanically non-releasably coupled to the second surface 48 of the screw head 50 without the non-threaded second portion 30, depicted in Figs. 1A, B extending from the threaded first portion 42 and a second breakaway 43. The second breakaway 43 releasably couples the first surface 44 of the screw head 50 to a breakaway tab 45. The threaded first portion 42 of the elongated stem 11 has caught at least one thread 63 of the hollow threaded channel 64 of the hinge 66, by threading the threads 67 of the threaded first portion 20 of the elongated stem 11 with the threads 63 of the hollow threaded channel 64.

[0036] In all preferred embodiments, the proximal end E of the threaded first portion 42 and the second surface 48 of the screw head 50 are mechanically and physically non-releasably coupled.

[0037] In one embodiment, the breakaway tab 45 extends along a longitudinal axis of the screw 13, away from the first surface 44 of the screw head 50.

[0038] Fig. 5 depicts a top plan view of a screw 85 having a screw head 86. The screw head 86 has a first surface 80 and a driver slot 81, therein. The screw head 86 is releasably coupled to a breakaway tab 84, having a breakaway 83 therebetween. The breakaway tab 84 has a first surface 79, and the first surface 79 may be coplanar with the first surface 80 of the screw head 86.

[0039] Figs. 6A - 6C depict a flow diagram of a method 90 of replacing a screw 10, 13 in a hinge 66, depicted in Fig. 4, and described in associated text and depicted in Figs. 2A.-3B, and described in associated text. In a step 92 of the method 90, a hinge 66 is provided. In the step 92 of providing the hinge 66, first and second straps 60, 61 may be pivotably coupled to a cylinder 62. The cylinder 62 has a hollow threaded channel 64 therein;

[0040] In a steps 96 and 98 a screw 10, 13 is provided. The screw 10, 13 comprises: a head 15, 50; an elongated stem 11,14.

[0041] In the steps 96, 98 the elongated stem 11, 14 comprises: either a threaded first portion 20, 42 adjacent to the head 15, 50; and a non-threaded second portion 30, extending from the threaded first portion 20, 42; and a first breakaway 25 therebetween, wherein the first breakaway 25 releasably couples the non-threaded second portion 30 to the distal end C of the threaded first portion 20, or a threaded first portion 42 adjacent to the head 50 without the non-threaded second portion 30 extending from the threaded first portion 42 and a second breakaway 43, wherein the second breakaway 43 releasably couples the first surface 44 of the screw head 50 to a breakaway tab 45;

[0042] In a step 100 of the method 90, the non-threaded second portion 30 of the elongated stem 11 may be inserted into the hollow threaded channel 64 in the hinge 66 so that the non-threaded second portion 30 of the elongated stem 11 extends out of the hollow threaded channel 64 of the hinge 66.

[0043] Alternatively, in the step 102 of the method 90, the threaded first portion 42 of the elongated stem 14 may be inserted into the hollow threaded channel 64 in the hinge 66 by a user manipulating the insertion using the breakaway tab 45.

[0044] In a step 104 of the method 90, the threaded first portion 20, 42 of the elongated stem 11, 14 may be aligned with the threads 63 of the hollow threaded channel 64 of the hinge 66.

[0045] In a step 106 of the method 90, the first threaded portion 20, 42 of the elongated stem 11, 14 may be screwed into the hollow threaded channel 64 of the hinge 66 by rotating the threaded first portion 20, 42 of the elongated stem 11, 14 that has been aligned with the threads 63 of the threaded hollow channel 64 of the hinge 66.

[0046] In one embodiment of the step 102 of the method 90, the breakaway tab 45 extends along a longitudinal axis of the screw 13, away from the first surface 44 of the screw head 50.

[0047] In one embodiment of the step 102 of the method 90, a first surface 79 of the breakaway tab 84 and a first surface 80 of the screw head 86 are coplanar, depicted in Fig. 5, and described in associated text.

[0048] In one embodiment of the step 106 of the method 90, a user may turn the breakaway tab 45 about its longitudinal axis to rotate the screw 13, wherein the breakaway tab 45 is releasably coupled to the first surface 44 of the screw head 50 by the second breakaway 43.

[0049] In one embodiment of the step 106 of the method 90, the breakaway tab 45, 84 is broken off from the first surface 44 of the screw head 50 at the second breakaway 43, or at the second breakaway 83, after the threaded first portion 42 of the elongated stem 14 catches at least one thread 63 of the threaded hollow channel 64 of the hinge 66.

[0050] In one embodiment of the step 106 of the method 90, the non-threaded second portion 30 of the elongated stem 11 is broken off at the first breakaway 25 from the threaded first portion 20 of the elongated stem 11 after the threaded first portion 20 of the elongated stem is essentially completely screwed into the threaded hollow channel 64 of the hinge 66.

[0051] In one embodiment of the step 102 of the method 90, inserting the non-threaded second portion 30 of the elongated stem 11 into the hollow threaded channel 64 in the hinge 66 so that the non-threaded second portion 30 of the elongated stem 11 extends out of the hollow threaded channel 64 of the hinge 66, by a user pulling the non-threaded second portion 30 of the elongated stem 11.

[0052] In one embodiment of the step 106 of the method 90, a user removes the non-threaded second portion 30 from the elongated stem 11 of the screw 10 after catching at least one thread 63 of the hollow threaded channel 64 of the hinge 66.
one embodiment of the step 106 of the method 90, the breakaway tab 45 extends along a longitudinal axis of the screw 13, away from the first surface 44 of the screw head 50 when the breakaway tab 45 is broken off from the first surface 44 of the screw head 50 at the second breakaway 43, after the threaded first portion 42 of the elongated stem 14 catches at least one thread 63 of the threaded hollow channel 64 of the hinge 66.

[0053] The description of the embodiments of the present invention is given above for the understanding of the present invention. It will be understood that the invention is not limited to the particular embodiments described herein, but is capable of various modifications, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, it is intended that the following claims cover all such modifications and changes as fall within the true spirit and scope of the invention.


Claims

1. A hand-held screw (10) adapted to be easily manipulated by a user during insertion into an intended screw hole (100), said screw comprising:

a head (15) having a first surface (19) and a second surface (18) facing away from the first surface;

an elongated stem (11) comprising a threaded first portion (20) and a non-threaded second portion (30) extending from the distal end of the threaded first portion;

a proximal end (A) of the threaded first portion being mechanically and physically coupled to the second surface of the screw head, the coupling not being a breakaway;

a breakaway (25) releasably coupling the non-threaded second portion to the distal end (C) of the threaded first portion, said breakaway being defined by a region of the stem between said first and second portions that relative to both of said first and second portions is narrow and of short axial length;

the non-threaded second portion having:

a diameter (W3) smaller than a diameter (W2) of the threaded first portion for first insertion into an intended screw hole (100), and

adapted for manipulation by hand by a user on entry of the threaded first portion into an intended screw hole (100) and extension of the non-threaded second portion from an intended screw hole (100), and being removable on complete insertion of the screw into an intended screw hole (100) by braking or cleaving the breakaway (25); and characterised in that the length (L2-L1) of the non-threaded second portion (30) is greater than the length (L1) of the threaded first portion (20).


 
2. The screw of claim 1, wherein the length (L1) of the threaded first portion (20) from its proximal end (A) to its distal end (C) is about 0.3375 in (8.57 mm) to about 0.4125 in (10.48 mm); and the length (L2-L1) from the distal end (C) of the threaded portion to the distal end (B) of the non-threaded second portion (30) is about 0.3598 in (9.14 mm) to about 0.4400 in (11.18 mm).
 
3. The screw of claim 1 or 2, wherein the threaded first portion (20) has a 6-32 UNF thread, wherein conventional UNC or UNF thread is a 60 degree thread.
 
4. The screw of claim 1, 2 or 3, wherein the diameter of the breakaway (25) is less than or equal to 0.015 in (0.38 mm) when the diameter of the elongated stem is essentially equal to 0.040 in (1 mm).
 
5. The screw of any preceding claim, wherein the length of the first threaded portion is from about 0.3375 in. to about 0.4125 in. (8.6-10.5 mm) and the length of the second non-threaded portion is from about 0.6973 in. to about 0.8525 in. (18-21.7mm).
 
6. The screw of any preceding claim, which is of metal or alloy.
 
7. The screw of claim 6, which is of stainless steel.
 
8. The screw of claim 6, which is of carbon steel, brass, nickel silver or titanium.
 
9. The screw of any preceding claim, wherein the first surface has a driver formation which is a single groove, a cross-shaped groove or is hexagonal for turning with a hex wrench.
 
10. A hinge (66) comprising first and second straps (60, 61) pivotably coupled to a cylinder (62) having a hollow threaded channel (64) therein, and a screw (10) as defined in any preceding claim having its non-threaded second portion (30) aligned with the hollow threaded channel (64) and inserted into the hollow threaded channel so that the threaded first portion (20) of the elongated stem (11) catches at least one of the threads (63).
 
11. The hinge of claim 10, which is of metal or alloy.
 
12. The hinge of claim 11, which is of stainless steel.
 
13. The hinge of claim 11, which is of carbon steel, brass, nickel silver or titanium.
 
14. The hinge of any of claims 10-13, wherein the non-threaded second portion (30) of the stem extends out of the hollow threaded channel (64) of the hinge.
 
15. A method of inserting a screw (10) into a screw hole (100), comprising:

providing a screw hole (64, 100):

providing a screw (10), comprising:

a head;

an elongated stem comprising:

a threaded first portion (20) adjacent to the head; and

a non-threaded second portion (30) extending from the threaded first portion (20); and

a breakaway (25) therebetween,

wherein the breakaway (25) releasably couples the non-threaded second portion (30) to the distal end (C) of the threaded first portion (20), and

wherein the diameter (W3) of the non-threaded second portion (30) is smaller than the diameter (W2) of the threaded first portion (20) of the elongated stem (11);

wherein the length (L2-L1) of the non-threaded second portion (30) is greater than the length (L1) of the threaded first portion (20)

inserting the non-threaded second portion (30) of the elongated stem (11) into the screw hole (100);

extending the non-threaded second portion (30) of the elongated stem (11) out of the screw hole (64, 100);

screwing the screw (10) into the screw hole (64, 100);

removing the non-threaded second portion (30) on complete insertion of the screw (10) into the screw hole (64, 100) by manipulating the non-threaded second portion (30) of the elongated stem (11) by a user by hand, resulting in breaking or cleaving the breakaway (25).


 




Drawing