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US 12,728,509 B2Granted
High efficiency torsion spring tacker
AssigneeWorkTools, Inc.
InventorJoel S. Marks
Life of this patent
Estimating the term…
Abstract
A spring energized fastening tool with compact, rigid, low friction working elements is disclosed. A torsion power spring includes forward extending arms with the arms pressing each other proximate a front distal end of the spring. A cantilevered lever links to a handle and engages the spring adjacent to the striker. A bottom loading staple track unlatches and opens through a simple pulling-out action. Structures are provided to enable fitment with a formed sheet metal handle and housing. The fastening tool is particularly simple to assemble, powerful, and of low operating effort.
Claims21
A fastening tool, comprising:
- a housing with a top, bottom and sides, the housing extending longitudinally between a front and a rear;
- a handle pivotally attached to the housing at a handle/housing pivot, the handle/housing pivot being at an upper front location of the housing;
- a fastener guide track disposed along the bottom of the housing;
- a striker disposed at the front of the housing including an upper striker position above the fastener guide track and a lower striker position in front of the fastener guide track;
- a grip body of the housing elongated front to rear below the handle;
- a grip opening of the housing elongated front to rear below the grip body;
- a power spring supported within the housing, the power spring being a torsion type including a spring coil, the spring coil being confined within the grip body;
- the power spring having a first spring arm extending forward from the spring coil to a first spring end, the first spring end linked to the striker to move with the striker, a second spring arm extending forward from the spring coil to a second spring end, the second spring arm pressing the first spring arm at a location of preload to hold the power spring in a preloaded condition, the location of preload being spaced forward of the spring coil to be adjacent to the striker;
- a lever extending longitudinally from a lever rear end to a lever front end, the lever pivotally attached to the housing at a lever pivot near the lever rear end, the lever rotating about the lever pivot to move vertically at the lever front end within the housing including an upper lever front end position and a lower lever front end position;
- the lever including a central lever location between the lever front and rear ends, the central lever location linked to the handle at a location of the handle rearward of the handle/housing pivot, the lever front end being cantilevered forward from the central lever location whereby pressing the handle downward causes the lever front end to move downward, the lever front end including a linkage to the second spring arm forward of the central lever location wherein the lever, at the lever front end, moves downward to force the second spring arm to move downward away from the first spring arm in the lower lever front end position;
- and
- the lever rear end including an upper edge, a lower edge, and an arcuate rear most edge connecting the upper and lower edges to form a rear edge perimeter, the rear edge perimeter being at least partly nested within a winding of the spring coil wherein the winding at least partly surrounds the rear edge perimeter.
9 more elements
A fastening tool, comprising:
- a housing with a top, bottom and sides, the housing extending longitudinally between a front and a rear;
- a fastener guide track disposed along the bottom of the housing;
- a striker disposed at the front of the housing including an upper striker position above the fastener guide track and a lower striker position in front of the fastener guide track;
- a grip body of the housing elongated front to rear below the handle;
- a grip opening of the housing elongated front to rear below the grip body;
- a power spring supported within the housing, the power spring being a torsion type including a spring coil with a spring coil axis, the spring coil axis extending across a width of the grip body, the spring coil being confined within the grip body;
- the power spring having a first spring arm extending forward from the spring coil to a first spring end, the first spring end linked to the striker to move with the striker, a second spring arm extending forward from the spring coil to a second spring end;
- a lever pivotally attached to the housing, the lever linked to the power spring wherein moving the lever causes the second spring arm of the power spring to deflect and store energy;
- a rear of the spring coil includes four adjacent coil winding segments abutting each other;
- and
- the grip body having locations within the grip body vertically above and below the spring coil axis that are unoccupied by moving components.
8 more elements
A fastening tool, comprising:
- a housing with a top, bottom and sides, the housing extending longitudinally between a front and a rear;
- a handle pivotally attached to the housing at a handle/housing pivot, the handle/housing pivot being at an upper front location of the housing;
- a fastener guide track disposed along the bottom of the housing;
- a striker disposed at the front of the housing including an upper striker position above the fastener guide track and a lower striker position in front of the fastener guide track;
- a grip body of the housing elongated front to rear below the handle;
- a grip opening of the housing elongated front to rear below the grip body;
- a power spring supported within the housing, the power spring being a torsion type including a spring coil, the spring coil being confined within the grip body;
- the power spring having a first spring arm extending forward from the spring coil to a first spring end, the first spring end linked to the striker to move with the striker, a second spring arm extending forward from the spring coil to a second spring end;
- a lever extending rearward from a lever front end adjacent to the striker to a lever rear end, the lever linked to the power spring second spring arm whereby downward motion of the lever causes the second spring arm to deflect and store energy, the lever including a position adjacent to a terminal coil winding;
- a spring coil axis extending cross a width of the grip body between a first terminal coil winding and a second terminal coil winding, the first terminal coil winding opposed to the second terminal coil winding, the second terminal coil winding including an upper winding portion spaced from a sidewall of the grip body while the first terminal coil winding includes a top coil termination adjacent to an opposed wall of the grip body;
- and
- a rear of the spring coil includes four adjacent coil winding segments abutting each other.
9 more elements
A fastening tool, comprising:
- a housing with a top, bottom and sides, the housing extending longitudinally between a front and a rear;
- a handle pivotally attached to the housing at a handle/housing pivot, the handle/housing pivot being at an upper front location of the housing;
- a fastener guide track disposed along the bottom of the housing;
- a striker disposed at the front of the housing including an upper striker position above the fastener guide track and a lower striker position in front of the fastener guide track;
- a grip opening of the housing having an elongated shape from front to rear;
- a torsion power spring supported within the housing having a spring coil with at least 3⅓ turns and confined within a housing space above the grip opening;
- wherein the power spring includes a first spring arm extending forward from the spring coil and linked to the striker to move with the striker, and a second spring arm extending forward from the spring coil;
- and
- a lever extending rearward from a lever front end adjacent to the striker to a lever rear end, wherein the lever is linked to the second spring arm, and wherein downward motion of the lever causes the second spring arm to deflect and store energy, the lever being at least partially nested within the spring coil.
6 more elements
Dependencies are inferred from the claim text.