Conveyors: power-driven – Conveyor section – Pusher conveyor and separate load support surface
Reexamination Certificate
1999-07-13
2001-05-29
Ellis, Christopher P. (Department: 3651)
Conveyors: power-driven
Conveyor section
Pusher conveyor and separate load support surface
C221S232000, C221S268000, C227S127000, C227S128000
Reexamination Certificate
active
06237747
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
A delivery device for a setting tool including a guide tube, a guide rail projecting from the guide tube substantially transverse thereto and having a guide channel having an upper side open in a direction opposite to a setting direction for receiving fastening elements, a slide having an entraining shoulder cooperating with the fastening elements for transporting same in a direction toward the guide tube, a spring for biasing the slide in the direction toward the guide tube, and a locking member pivotable into an interior of the guide channel for limiting displacement of the fastening elements located in the guide channel in the direction opposite to the setting direction.
2. Description of the Prior Art
The prior art discloses a setting tool for driving of nail-shaped fastening elements in, e.g., constructional component formed of wood. The setting tool includes a delivery device for receiving and guiding a plurality of fastening elements. The delivery device has a guide rail which projects from the guide tube of the setting tool substantially transverse to the guide tube. The delivery device further includes a slide displaceable along the guide rail and cooperating with a spring, with the slide preloading the spring when it is displaced to the free end of the guide rail. The slide has an entraining shoulder which projects into the interior of a guide channel of the guide rail and faces toward the guide tube. An elastic locking member is mounted on a side of the guide rail extending parallel to the setting direction. The locking member has a tangent-bent cover region which limit displacement of the fastening elements located in the guide channel in a direction opposite to the setting direction. The cover region is pivotable out of the projection of guide channel facing in a direction opposite to the setting direction in a loading position of the slide.
The fastening elements, which are located in the delivery device, have their stem regions projecting into the guide channel and their widened head-shaped end regions located in the end region of the guide rail facing in a direction opposite to the setting direction. Because the locking member can limit the displacement of the fastening elements in the direction opposite to the setting direction, the cover region of the locking member cooperates with the head-shaped end regions of the fastening elements. Because of this, the cover region is arranged in a spaced relationship with respect to the guide rail in the direction opposite to the setting direction. This results in a large overall height of the device in a direction parallel to the setting direction, which leads to difficult handling of the delivery device and, thereby, of the entire setting tool.
Accordingly, an object of the present invention is a delivery device for a setting tool which can be economically produced and which has a small height in a direction parallel to the setting direction.
SUMMARY OF THE INVENTION
This and other objects of the present invention, which will become apparent hereinafter, are achieved by providing fastening elements having two adjacent to each other stop edges which are spaced from each other in a direction parallel to the setting direction and which are provided in the stem region of a fastening element, and by providing a locking member having a guide region displaceable through a through-opening formed in a side of the guide rail extending parallel to the setting direction, and into the interior of the guide channel into a locking position in which the guide region formlockingly cooperates with the stop edges of at least one fastening element.
The formation of the locking member according to the present invention and the arrangement of the locking member on the delivery device according to the invention permit to achieve an overall height of the delivery device which only slightly exceeds the entire length of the fastening element. In addition, the inventive delivery device can be rapidly and simply loaded with the fastening elements.
In order to be able to achieve a formlocking connection between the guide region of the locking member and the fastening element, the guide region of the locking member cooperates, in the locking position of the locking member, with the two spaced stop edges of the fastening element.
In order to insure delivery of fastening elements having different diameters with the inventive delivery device, the fastening elements are surrounded, at least in their stem region, with respective guide members. The guide members can be formed, e.g., as a part of a strip-shaped nail magazine in which the separate guide members are connected with each other by connection webs. The limitation of the displacement of the fastening elements, which are surrounded by the guide members, in a direction opposite to the setting direction, is possible, e.g., by forming both stop edges of the fastening element on the guide member. E.g., the two stop edges can be formed as a part of side indentations or grooves formed in the guide members.
A reliable guidance of the fastening elements in the guide channel is preferably achieved by forming the guide region of the locking member as a strip that extends parallel to the longitudinal extent of the guide rail and has surfaces cooperating with the stop edges of the guide members. Because the strip can cooperate, in the locking position of the locking member, with several guide members, the guide region extends over several fastening elements located in the guide channel.
To provide for an automatic pivotal movement of the guide region of the locking member out of the interior of the guide channel or out of the grooves of the guide members when the slide is displaced into its loading position at the free end of the guide rail, advantageously, the locking member is formed as an elastic member.
In order to keep the depth of the guide region of the locking member in the interior of the guide channel or in the grooves of the guide members constant, advantageously, the locking member is provided, in its free end region, with a spacer which is supported, in the locking position of the locking member, against that side of the guide rail in which the through-opening is provided.
The fixing of the slide in its loading position is advantageously achieved by providing, at the free end of the locking member, a stop shoulder remote from the guide tube and formlockingly cooperating with a surface of the slide facing toward the guide tube when the slide is in its loading position at the free end of the guide rail and the locking member is in its locking position.
To provide for economical manufacture of the delivery device, preferably, the stop shoulder of the locking member is formed by the tangent-bent free end of the locking member.
In order to be able to achieve a good alignment of the stop edges of the fastening element, which are located in the guide channel or are formed on the guide member, with the guide region of the locking member, advantageously, the guide channel has at least one stop which extends parallel to the longitudinal extent of the guide rail and has a bearing surface facing in the direction opposite to the setting direction.
REFERENCES:
patent: 4821938 (1989-04-01), Haytayan
patent: 4930673 (1990-06-01), Pfister
patent: 5220123 (1993-06-01), Oehry
patent: 5597972 (1997-01-01), Wachter
patent: 5897046 (1999-11-01), Oehri et al.
patent: 5975350 (1999-11-01), Han
patent: 5975399 (1999-11-01), Oehri et al.
Gantner Gebhard
Sprenger Markus
Brown & Wood LLP
Crawford Gene O.
Ellis Christopher P.
Hilti Aktiengesellschaft
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