Tire pressure gauge
First Claim
1. A tyre pressure gauge comprising a cylindrical housing having an open top, a tubular member having a first end secured to said housing and a second end, a first measuring head fixed to said second end and capable of being inserted upon an air valve of a type for passing therethrough an air pressure from said tyre into said tubular member, a piston rod received in said member for being axially actuated therein by said air pressure, a spiral spring mounted between said housing and said piston rod for restoring said rod into a position not actuated by said pressure, a sectorial plate pivotally mounted in said housing, capable of being pivoted by said rod and having an arcuate toothed edge, a restoring spring mounted between said housing and said sectorial plate for restoring said plate into a position not pivoted by said rod, a pinion rotatably mounted in said housing and meshing with said toothed edge, a scale plate covered on said open top, a needle connected to said pinion for pointing on said scale plate when said rod pivots said sectorial plate which in turn rotates said pinion, and a pawl mounted in said housing and capable of pawling said pinion in a position rotated by said sectorial plate, characterized in that said gauge further includes:
- a soft tube having a first end detachably connected to said first measuring head and a second end; and
a second measuring head including;
a hollow measuring rod having a third end connected to said second end of said soft tube and a fourth end having a central axial projection having an eccentrical axial through hole communicating with a hollow center of said measuring rod; and
a cylindrical piece coaxially secured to said fourth end and capable of cooperating with said projection to form therebetween an annular space capable of inserting therein a top portion of said air valve.
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Accused Products
Abstract
A tire pressure gauge includes as in the prior art a cylindrical housing securing thereto a tubular member securing thereto a first measuring head, a piston rod, a spiral spring, a sectorial plate capable of being pivoted by the rod, a pinion meshing with the plate, a scale plate, and a needle connected to the pinion wherein the improvement is that the gauge further includes a soft tube having a first end detachably connected to the first measuring head and a second end connected to a second measuring head. Such gauge can conveniently measure the air pressure of inner wheels of a truck or a bus with the second measuring head without the need of bringing the cylindrical housing into the bottom of the bus.
31 Citations
5 Claims
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1. A tyre pressure gauge comprising a cylindrical housing having an open top, a tubular member having a first end secured to said housing and a second end, a first measuring head fixed to said second end and capable of being inserted upon an air valve of a type for passing therethrough an air pressure from said tyre into said tubular member, a piston rod received in said member for being axially actuated therein by said air pressure, a spiral spring mounted between said housing and said piston rod for restoring said rod into a position not actuated by said pressure, a sectorial plate pivotally mounted in said housing, capable of being pivoted by said rod and having an arcuate toothed edge, a restoring spring mounted between said housing and said sectorial plate for restoring said plate into a position not pivoted by said rod, a pinion rotatably mounted in said housing and meshing with said toothed edge, a scale plate covered on said open top, a needle connected to said pinion for pointing on said scale plate when said rod pivots said sectorial plate which in turn rotates said pinion, and a pawl mounted in said housing and capable of pawling said pinion in a position rotated by said sectorial plate, characterized in that said gauge further includes:
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a soft tube having a first end detachably connected to said first measuring head and a second end; and a second measuring head including; a hollow measuring rod having a third end connected to said second end of said soft tube and a fourth end having a central axial projection having an eccentrical axial through hole communicating with a hollow center of said measuring rod; and a cylindrical piece coaxially secured to said fourth end and capable of cooperating with said projection to form therebetween an annular space capable of inserting therein a top portion of said air valve. - View Dependent Claims (2, 3, 4, 5)
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Specification