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Pneumatic fastener-driving tool and method
| Details |
Inventors: Kleinholz, Edward O.;
Assignee: The Kiesel Co. (St. Louis, MO)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A pneumatically operated fastener-driving tool, particularly adapted for nailing drywall to the framing of a building, includes a housing, a reciprocator assembly mounted within the housing, and a piston mechanism mounted within the reciprocating assembly for axially driving the fastener into the drywall and underlying framing member. Upon actuation of the tool, the piston is pneumatically driven through a fastener-driving stroke and the reciprocator is reactively driven in an opposite direction. The oppositely driven reciprocator assembly absorbs recoil energy during the piston's driving stroke without transmitting an appreciable amount thereof to the housing, thereby substantially precluding housing recoil during driving of the fastener. At the end of the driving stroke, the reciprocator engages and is decelerated by the piston, thereby reducing housing recoil subsequent to the driving of the fastener. At the end of its driving stroke, the piston mechanism recesses the fastener in the drywall and engages a dimpler member to form a shallow recess around the driven fastener. |
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DETAILED DESCRIPTION A pneumatically powered tool and method are provided in which recoil is substantially eliminated during actual driving of a fastener from the tool into objects, such as a drywall sheet and an underlying framing stud, to be joined together.
A novel mechanism within the tool postpones tool recoil until the fastener is completely driven, and additionally significantly reduces the delayed recoil occurring after the fastener is driven.
This unusual and long sought-after result allows even a relatively unskilled operator to hold the tool in firm contact with the drywall, thus holding the drywall directly against the stud, until the tool has completely performed its fastening task.
Each driven fastener thus forms a drywall-to-stud connection point at which the drywall directly abuts the framing stud--even if the drywall must initially be deflected inwardly to contact the stud and would tend to spring outwardly during the use of a conventional pneumatic fastener-driving tool.
The unique recoil-delaying and minimizing feature of the tool, which permits it to be hand-held in contact with the drywall during the entire time in which the fastener is being pneumatically driven, also allows the tool to recess the fasteners and form spackling dimples around them to uniform depths despite variations in contact pressure between the tool and the drywall at different drywall-to-stud attachment points.
In a preferred embodiment, the tool comprises a housing; a reciprocator assembly mounted for linear movement within the housing; fastener-driving means, including a piston mounted within the reciprocator, for parallel linear movement relative thereto, for driving a fastener into a workpiece; and actuating means for penumatically forcing the fastener-driving means through a driving stroke and simultaneously reactively driving the reciprocator assembly in an opposite direction within the housing.
During the driving stroke of the piston, recoil energy is absorbed by and causes the opposite motion of the reciprocator assembly
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