Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1995-06-05
1997-06-10
Schwartz, Larry I.
Metal working
Method of mechanical manufacture
Assembling or joining
29798, 29243517, 227 15, B23P 1100
Patent
active
056364261
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The invention pertains to a retaining device for holding, guiding and self-actuated releasing of an assembly part, such as a nut or another element in a device for bringing the assembly part to a plate-shaped component, or in another device for precise conveyance of the element.
A retaining device of this type for a punching mechanism for pressing a nut into sheet metal is known for example from DE-PS 1,254,940 and is widely used in practice. In this punching mechanism the sliding unit forms the press plunger, which is mounted to a housing securely joined to the upper part of the press, and this sliding unit extends into the channel of the guide piece in order to feed the nut through the channel to the work position and to press it into the sheet metal resting on a bottom die. The guide piece is moved laterally up to a guide stud located off-center with respect to the housing; said guide stud can slide relative to the upper part of the press against the pretension of the helical compressed springs. The retaining device consists of two retaining catches that are articulated at the guide piece in the region of the feeding opening and block any downward motion of the nut, until the plunger moves downward and thereby pivots the two retaining catches into their open position. The nut then moves in the channel from the initial position down to the working position without being guided and positioned, except by the channel walls.
Therefore misalignments, slanted positions or other positioning inaccuracies can occur that result in corresponding errors during the assembly process. Additional disadvantages of the known device are that they require a relatively large manufacturing effort, a large number of individual parts and also a considerable space requirement.
SUMMARY OF THE INVENTION
The invention is based on the problem of refining a retaining device, so that it ensures a precise positioning of the joined part or of the element to be moved to the work position with relatively little construction effort.
In a retaining device designed according to this invention, the retaining catches are not moved up to the guide piece, but rather are pivotably mounted to the sliding part, so that they move along with the sliding part. Due to the forced guidance provided by this invention, they are held in their closed position during an outward movement of the sliding part until the sliding part reaches the working position, where then the forced guide releases the retaining catches to pivot outward into the open position.
This will ensure that the element taken along by the sliding part is transported directly up to the working position in a definite, stable manner, so that the number of possible errors in the processing occurring at the working position will be reduced significantly. Thus, identical transport and working sequences are always guaranteed. All these advantages are obtained with comparatively little construction expenditure.
Due to the invention and its favorable embodiments the following specific advantages are attained: being moved from their initial position to the working position existing tools.
The retaining device designed according to this invention is suitable in particular for use in a device for pressing in or mounting assembly parts and auxiliary assembly parts, for example, nuts, bolts and rivets, in plate-shaped assemblies. However in principle, it can be used for any kind of device in which the elements must be transported from a starting position in precise alignment to a working or transfer position.
BRIEF DESCRIPTION OF THE DRAWINGS
One application example of the invention will be explained in greater detail based on the figures. The figures show:
FIG. 1 A longitudinal cross section through a punching device for pressing a nut into a piece of sheet metal;
FIG. 2 A cross section along the line II--II in FIG. 1;
FIG. 3 A partially cutaway plan view of the housing of the punching device in FIG. 1;
FIG. 4 A longitudinal cross section through the retaining device of the punching m
REFERENCES:
patent: 1503861 (1924-08-01), Stimpson
patent: 1506788 (1924-09-01), Stimpson
patent: 3061837 (1962-11-01), Kent
patent: 4454650 (1984-06-01), Silver
patent: 4607418 (1986-08-01), Hatner
patent: 4698905 (1987-10-01), Taga
patent: 5172467 (1992-12-01), Muller
Luckhardt, deceased Heinrich
Luckhardt, representative Wolfgang
Multifastener Corporation
Nguyen Khan
Schwartz Larry I.
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