DE3537141A1 - Screw-screwdriver system with conical groove - Google Patents

Abstract

The invention relates, in principle, to all applications of screws. In practice, screws are often so blocked that they are very difficult to unscrew (e.g. bonding to paint, rusting through, etc.). The slipping-off of the tool is an additional problem. The problem was solved by widening the screw-head groove inwards and, to match this, conically widening the end of the screwdriver. Slipping back is prevented. Additional blocking bulges also prevent lateral jumping out. Both screws and screwdrivers can be used with conventional screwdrivers and screws.

Description

title

System screw - screwdriver with conical groove.

field of use

In principle, all previously used areas of screws.

purpose

The idea of the screw is a permanent connection two bodies, the special thing is that the Connection can be released again without damage. The requirement here is that not only screwing in the screw is possible without special problems, but also unscrewing.

State of the art

In principle, all screws would be a pin with a screw thread and broad head with a turning groove (or cross).

Critique of the state of the art

Screwed screws are often wedged in such a way that they are difficult or difficult to unscrew. - This can have different causes:
- Gluing the edge of the screw head with hardened paint;
- rusting of the thread (rust expands);
- Toothings with the surface of the thread, for example due to material stresses that have become larger (swelling of wood, changed tensile or compressive stresses).

The common end of the screwdriver is flat a slightly tapered cross-section. Becomes the torque increases, it slips, the end slides out of the groove. - Now you will increase the pressure on the screw. This in turn increases but still the friction on the thread. - Still worked when the screw is screwed in, the contact pressure in the direction of advance while he counteracts the backdriving when unscrewing works. - Finally, if the Head by repeatedly slipping the groove edges like this be scraped off that there is no longer a stop.

task

The invention has for its object the turning of to ease jammed screws.

solution

This invention is achieved according to the invention in that Slipping through the conical shape of the rotating groove is prevented, in which the widened accordingly below End of the screwdriver fits.

Further configuration

In addition, a screwdriver should be inserted into the Handle foldable lever must be installed. When folding up (see drawing) it extends the handle sideways.

Achievable advantages

The conical widening inwards in the groove of the  Screw prevents the correspondingly shaped Screwdriver. - So you can screw move by turning alone, slipping out, and pressing the screwdriver with its disadvantageous The consequences are eliminated.

Screwing in and screwing on becomes even easier the quick-open lever, the greater torque enables.

The cone screwdriver retains all advantages and Skills largely conventional Screwdriver.

description

The insertion of the screwdriver end into the turning groove The screw happens by moving the screwdriver lengthways the wide edge of the screwdriver end by 30 degrees on groove and along the groove until the Screwdriver slips) and back into the Is turned vertically.

• List of names 1: Conical widening at the end of the screwdriver
  2: Inwardly widened groove of the screw head (cut)
  3: screwdriver handle
  4: Retractable rotary lever

Claims (3)

Areas previously used for screws (in principle all except cross-head screws), 1. System screw - screwdriver with a conical groove, characterized in that slipping out of the screwdriver end is prevented by the conical configuration of the rotating groove, into which the correspondingly widened end fits below. 2. Screw according to claim 1, screwdriver accordingly, characterized in that a lever which can be folded into the handle is additionally installed. ( Fig. 3 drawing b ).