This invention provides a connection between a fastener, a connector and a structural member. The present invention has particular utility in positioning a power fastener driving tool for driving the fastener through the connector and into the structural member. The connector is generally used for joining two or more structural members together, such as a hanger for attaching a joist to a header.
The present invention provides that the material adjacent a fastener opening or point of fastener entry in a connector have a unique shape that improves the driving of the fastener, as well as the ability of the fastener to resist loads on the connection. The material of the connector adjacent the opening can be formed with a conical, downwardly projecting protrusion that guides the fastener towards the opening and can, in certain embodiments, itself form a connection with the structural member.
Using power fastener driving tools to join connectors to structural members can be very cost effective, as driving fasteners with a power tool is generally faster than driving fasteners by hand. Typical power fastener driving tools can be electrically or pneumatically powered. They can also be gas powered or use exploding charges. When properly used, power driving tools also have good consistency in driving the fastener with sufficient force such that the nail will be driven to the correct depth with its head contacting the surface of the wood or the face of the connector. This is helpful as the fastening strength of a nail is improved when the head of the nail is in contact with the surface of the connector or member into which it is driven. When the head of the nail is in contact with the connector or member, the nail connection is said to have end fixity. A fastener with end fixity resists rotation under shear loading. The state when a nail is not in contact is called an under-driven nail. The present invention is designed to assist with the use of power fastening guns and to improve the strength of the connection made with the fastener.
It is also important when installing connectors to use the prescribed number of fasteners in the proper locations to achieve design load values. As such most connector manufactures will pre-punch holes in the connectors where the fasteners are supposed to be driven. Sometimes the openings will be of different shapes to differentiate between required fasteners and additional fasteners that may be used. As powered, fastener driving tools can be rather bulky and block the user's ability to see exactly where the fastener is being driven, a number of inventions have been developed to help the operator locate the opening in the connector.
A number of prior inventions addressed the issue of helping the operator locate the opening when using a power fastener driving tool by modifying the tool.
U.S. Pat. No. 5,579,975, granted to Charles J. Moorman, teaches power fastener driving tool where the nail to be driven projects forwardly of the tool such that the user can actually see the fastener being received in the opening before they actuate the tool. This powered fastener driving tool is specifically designed for driving a nail through an opening in a metal connector. Such driving tools are typically called metal connector nail guns.
U.S. Pat. No. 5,238,167, granted to Frank C. Howard et al, and U.S. Pat. No. 5,452,835, granted to Yury Shkolnikov, teach power fastener driving tools that use a protruding finger that is disposed adjacent the fastener to be driven. When this finger is received by the opening in the connector the user will know the fastener will be properly located.
U.S. Pat. No. 3,312,485, granted to G. A. Koenighshof, and U.S. Pat. No. 4,928,867, granted to Mark B. Jensen et al, addressed the issue of helping the operator locate the opening or point of fastener entry when using a power fastener driving tool by shaping the material of the connector around the opening in a unique way.
U.S. Pat. No. 4,928,867, in one approach, taught forming the nail gun with a special alignment foot that cooperated with an especially shaped alignment tab on the connector to align the fastener to be driven with the opening in the connector. In most of the embodiments shown in the patent, when the alignment foot captures the alignment member, the fastener should be in the proper position. In another approach, the patent teaches an alignment member on the connector that will receive the nose of a typical power fastener gun. In this embodiment, one or more upper rings or arcs are formed concentrically about the opening or predetermined position for the fastener, or, conversely, it can be a groove partially or fully circumscribing the predetermined position, or a combination of one or more upper rings and grooves. In most embodiments shown in the patent, the alignment foot of the tool and the alignment member of the connector are designed to fit together.
Similarly, U.S. Pat. No. 3,031,727, granted G. G. Nesbitt, teaches nail openings in a connector plate where the nail openings are surrounded by an embossed ring that may be used to center a nail gun on the nail opening. This patent also teaches forming the nail opening with jagged, pointed projections. These projections are formed from the metal being pushed and ruptured during the formation of the nail hole. According to the inventor, the projections bite into the wood when a nail is driven through the plate, increasing the area of contact and thereby increasing the holding power of the nail. Published US Application 2004/0096269, filed by George Shahnazarian and published on May 20, 2004, also teaches forming fastener openings with rearwardly extending metal projections that will be embedded in the wood of the beam when a fastener is driven through the opening.
The present invention provides an improved fastening and alignment member on the connector that can both aid in the driving of the fastener by a power fastener gun and improve the connection between the connector and the structural member.
The present invention provides a unique connection between a fastener, a connector and a structural member.
The present invention provides a fastening and alignment member on a connector.
The fastening and alignment member can be formed as one or more sloping surfaces that descend toward the opening or predetermined location for a fastener to be driven through the connector. The sloping surfaces are located on the periphery of the opening or predetermined fastener location. The sloping surfaces can be a plurality of grooves or valleys converging or traveling towards the opening.
The one or more sloping surfaces are formed adjacent to the opening or predetermined location for the fastener at the periphery of the opening or predetermined location. The sloping surfaces can be part of a projecting member that protrudes below the back face of the connector, such that the projecting member can be embedded in the material of the structural or support member. The projecting member is adjacent to the opening and preferably surrounds the entire periphery of the opening. Preferably, the projecting member is concentric with the opening. Preferably, the rim of the opening is depressed with respect to the outlying portions of the front face of the connector around the opening or predetermined location for the fastener. In certain embodiments, the projecting member protrudes towards the attachment face of the structural member. In preferred embodiments, the projecting member protrudes into the structural member.
The sloping surfaces can descend from one or more upper portions adjacent to the sloping surfaces. The upper portions are located radially farther away from the opening or predetermined location for the fastener than the opening. The upper portions can be arranged in concentric manner around the fastener opening or predetermined location for the fastener. The sloping surface can be a single annular surface making a conical frustum.
The one or more upper portions can be surrounded by a groove or a series of depressions in the top surface of the connector. The one or more upper portions can partially or fully circumscribe the predetermined position for the fastener. The one or more depressions can partially or fully circumscribe the innermost upper portion or portions. The groove or series of depressions are preferably formed as protruding members that protrude from the back face of the connector.
The body portions that make up the connector can be formed as a planar members with planar front and back surfaces and the fastening and alignment member is a deformation in the body of the connector that creates depressions in the planar front surface and protrusions or projections extending out of the planar back surface of the connector. The fastening an alignment member lifts the body portion of the connector off of the attachment face of the structural member.
The fastening and alignment member can be formed as a upper ring or arc, or a plurality of upper rings or arcs surrounding or partially surrounding an opening or a predetermined location or position for driving a fastener through the connector.
The fastening and alignment member can be formed as a plurality of concentrically disposed upper rings or arcs or upper portions separated by a trough or groove or other recess, surrounding or partially surrounding an opening or a predetermined location for driving a fastener through the connector. The groove or recess between the upper portions can have a back surface that projects farther away from the front surface of the connector than the back surfaces of the connector that are disposed radially outward and farther away from the opening than the trough. The back surface of the recess can extend as far toward the attachment face of the structural member as the projecting member. Preferably, the projecting member extends farthest away from the front surface of the connector than the back surface of the recess and the back surface of the portions of the connector disposed radially outward from the recess or trough surrounding the opening.
The opening can adopt any shape. Typical fastener openings in connectors are round or triangular with rounded vertices.
In the preferred embodiment, the present invention provides a conical, downwardly projecting protrusion that guides the fastener towards the opening and itself forms a connection with the structural member.
It is another benefit of the present invention that the use of the fastening and alignment member on a connector increases the end fixity of the nail or other fastener with a head that is received in the opening in the fastening and alignment member. If the head is not driven all the way, the funnel shape of the feature means less deformation needs to occur before fixity is developed. The sloping shape of the fastening and alignment feature or member means more of the nail head will be engaged by the feature and sooner under deforming loads.
It is another benefit of the present invention that the embossed protrusions help locate the nose-piece of certain guns.
Another benefit of the present invention is that the funnel-shaped sides of the guide help direct the nail into the opening.
The washer like recess or groove between the upper portions in closer proximity to the nail opening and the outer upper portion farther away from the nail opening of the preferred embodiment also results in less deformation of the wood member by having the pressure of the nail head distributed across a wider surface area.
The present invention is also designed be used with pneumatic tools used in general framing, commonly called framing nailers. The noses of framing nailers are typically formed with teeth that grip the wood, and the nose is designed so that the nail does not protrude from the tool. Being able to work such nailers is a benefit to workers who prefer to use a framing nailer as they do not have to change tools to install a hanger or connector.
The present invention also provides a hanger connector having the alignment and fastening member of the present invention.
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The connector can be formed such that it has a first side flange 36, and the first side flange 36 is disposed in close proximity to the joist 4. The first side flange 36 has a substantially triangular-shaped gusset portion 38 that is substantially planar, a substantially planar front upstanding flange portion 39, and a substantially planar rear upstanding flange portion 40, and the triangular-shaped gusset portion 38 has a seat side edge 41. The substantially planar front and rear upstanding flange portions 39 and 40 of the first side flange 36 each attach to a different side edge 42 of the triangular-shaped gusset portion 38 that is not the seat side edge 41. The substantially planar front and rear upstanding flange portions 39 and 40 of the first side flange 36 attach together along a common flange portion side edge 43. The substantially planar rear upstanding flange portion 40 connects to a back flange 35 along a shared side edge 44 between the back flange 35 and the substantially planar rear upstanding flange portion 40. The back flange 35 interfaces with the structural member 3 and is attached to the structural member 3 by one or more fasteners 2.
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Number | Date | Country | |
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Parent | 15207202 | Jul 2016 | US |
Child | 17409721 | US |