Title of Invention

AN IMPROVED ADJUSTABLE SPANNER

Abstract

An improved adjustable spanner adapted to release or tighten nuts off/on the bolts of different sizes comprising of a spanner head and a handle extending from the head, the said head having a fixed jaw provided with a slot and an opposed movable jaw adopted to be displaced towards and away from the fixed jaw by means of a rack screw shank provided at the base of the movable jaw engaging with a threaded screw fitted in the head of the spanner, the screw shank of the said movable jaw being confined into the slot of the fixed jaw in fully opened position of the spanner and nut protruding out of the head, and the said spanner having a 15 degree head angle to permit the use of the said spanner from both sides to rotate a nut in constricted spaces where only 30 degree arc movement is possible.

Full Text

FORM - 2 THE PATENTS ACT, 1970 (39 of 1970) COMPLETE Specification (Section 10; rule 13) AN IMPROVED ADJUSTABLE SPANNER TAPARIA TOOLS LIMITED of A-2/423-424, Shah & Nahar, Lower Parel (W), Mumbai 400 013, Maharashtra, India an Indian Company THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE NATURE OF THIS INVENTION AND THE MANNER IN WHICH IT IS TO BE This invention relates to an improved adjustable spanner. In particular, this invention relates to a single tool/device that can function as an adjustable spanner for releasing nuts off the bolts of various sizes and which can be used in constricted/confined spaces for releasing nuts off the bolts and which can be used from both the sides with equal ease. In the prior art, individual size spanners were used to tighten the nuts on the bolts or to release nuts off the bolts. This required a mechanic/workman to possess a plurality of spanners to release different size nuts. These spanners had a distinct set of numbers each associated with a particular size of nut. In the prior art, the spanners/wrenches can not be used for opening nuts/bolts in restricted spaces. The prior art spanners are aligned such that the head in the handle are in the same straight line. In the prior art, adjustable spanner is also known which can be used for tightening/releasing nuts on/off the bolts of various sizes. But in this adjustable spanner, jaw shank protrudes out when jaws are fully opened and this protruding jaw shank restricts the working of the spanner in the confined/constricted spaces. Further, the head angle of the adjustable spanner does not allow the spanner to operate equally from both sides. 2 According to this invention there is provided an improved adjustable spanner adapted to release or tighten nuts off/on the bolts of different sizes comprising of a spanner head and a handle extending from the head, the said head having a fixed jaw provided with a slot and an opposed movable jaw adopted to be displaced towards and away from the fixed jaw by means of a rack screw shank provided at the base of the movable jaw engaging with a threaded screw fitted in the head of the spanner, the screw shank of the said movable jaw being confined into the slot of the fixed jaw in fully opened position of the spanner and nut protruding out of the head, and the said spanner having a 15 degree head angle to permit the use of the said spanner from both sides to rotate a nut in constricted spaces where only 30 degree arc movement is possible. Typically, in accordance with another practical and preferred embodiment of this invention, the improved adjustable spanner can be used on the obverse and reverse side and can be applied to the nut on both faces permitting the head angle of fifteen degrees of the spanner to be reversed. The previously rotated nut, which was rotated through 30 degrees, can now be further rotated through another thirty degrees. Thus a fifteen-degree head angle of the spanner in accordance with this invention permits the spanner to angularly displace the nut through sixty degrees. Such a movement can be particularly useful when space permits only thirty-degree arc movement. 3 In accordance with another feature of this invention, the shank of the screw for the moveable jaw does not protrude from the jaw head. This facilitates easier movement of the spanner in constrained and constricted spaces. The invention will now be described with reference to the drawings accompanying the provisional specification, in which Figures 1 to 4 show in plan the improved adjustable spanner showing step by step the movement of the spanner in accordance with this invention in a constricted/confined space to rotate angularly to displace a hexagonal nut through sixty degrees; Figure 5 shows the spanner according to the prior art in which the jaw shank is shown with a protruding jaw in fully opened position; and Figure 6 shows the spanner in accordance with this invention in which the jaw shank does not protrude even in fully opened position. Referring to the drawings, Figure 1 shows the initial zero degree position of the nut N and the spanner S. Two opposite flat surfaces of a hexagonal nut N are properly gripped in between the jaws of the spanner. Spanner head angle of 15 degree is also shown in Figure 1. 4 Figure 2 shows the position of the nut N and the spanner S when the spanner is rotated in a thirty degrees arc and the nut N also moves in thirty degrees angle. Figure 3 shows the spanner S as reversed and applied to the nut N. The spanner S is then rotated through 30 degrees as seen in Figure 4, thereby moving the nut N through a further thirty degrees angle. The effective movement of the nut N is therefore sixty degrees with respect to the initial position seen in Figure 1. The spanner S is then obversed and the cycle shown in Figures 1 to 4 is repeated for further angularly displacing the nut N. In this way with a head H which is angled through 15 degrees, the spanner S can be used on the obverse as well as the reverse side with equal ease, to rotate a nut typically a hexagonal nut within a constrained arc of thirty degrees movement of the handle. As seen in Figure 5 a prior art adjustable spanners having a protruding jaw shank in its fully open position. The protruding jaw shank interferes with the surroundings. The jaw shank of the spanner according to this invention, seen in figure 6 is designed in such a way that the jaw shank does not protrude out even when the movable jaw is displaced to its extreme open position. In accordance with another feature of the invention a scale is etched on the head of the spanner and a pointer is provided on 5 the movable jaw which indicates the exact displacement of the movable jaw in relation to its initial closed position. While the present invention has been described herein with reference to a specific embodiment thereof, it is contemplated that the present invention is not limited thereby and various changes and modifications may be made therein for those skilled in the art without departing from the scope of the invention which is disclosed herein in the appended claims. > 6 We Claim: [1] An improved adjustable spanner adapted to release or tighten nuts off/on the bolts of different sizes comprising of a spanner head and a handle extending from the head, the said head having a fixed jaw provided with a slot and an opposed movable jaw adopted to be displaced towards and away from the fixed jaw by means of a rack screw shank provided at the base of the movable jaw engaging with a threaded screw fitted in the head of the spanner, the screw shank of the said movable jaw being confined into the slot of the fixed jaw in fully opened position of the spanner and nut protruding out of the head, and the said spanner having a 15 degree head angle to permit the use of the said spanner from both sides to rotate a nut in constricted spaces where only 30 degree arc movement is possible. [2] An improved adjustable spanner as claimed in claim 1, in which a scale is etched on the head of the spanner and a pointer is provided on the movable jaw which indicates the exact displacement of the movable jaw in relation to its initial closed position. 7 [3] An improved adjustable spanner substantially as herein described and illustrated in figures 1, 2, 3, 4 and 6 of the drawings accompanying the provisional specification. Dated this 10th day of January, 2003 lan Dewan OfR. K. Dewan&Co., Applicants' Patent Attorney.

Documents:

87-mum-2002-cancelled pages(23-06-2004).pdf

87-mum-2002-claims(granted)-(23-06-2004).pdf

87-mum-2002-correspondence(23-06-2004).pdf

87-mum-2002-correspondence(ipo)-(26-12-2006).pdf

87-mum-2002-drawing(30-01-2002).pdf

87-mum-2002-form 1(30-01-2002).pdf

87-mum-2002-form 2(granted)-(23-06-2004).pdf

87-mum-2002-form 2(granted)-(23-6-2004).doc

87-mum-2002-form 3(30-01-2002).pdf

87-mum-2002-form 5(10-01-2003).pdf

87-mum-2002-other document(23-05-2003).pdf

87-mum-2002-power of attorney(30-01-2002).pdf

87-mum-2002-we claim(granted)-(23-6-2004).doc

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