CS260324B1 - Saw blade guard - Google Patents

Abstract

The protective cover of the saw blade consists of a body equipped on the inlet part with a lifting disc of the cover and on the outlet part with a suspension pin. The solved problem is to increase the level of safety at work, which is achieved by connecting one end of a two-armed lever to the suspension pin of the cover body, the other end of which is provided with a weight and whose middle part is supported on the first pin of the rib of the expansion wedge, and parallel to the two-armed lever is arranged a single-armed lever, one end of which is connected to an additional suspension pin of the cover body and the other end of which is connected to the second pin of the rib of the expansion wedge.

Description

280324

OBJECT

Process for preparing petroleum resin by thermo-polymerization of unsaturated hydrocarbon fractions at temperatures of 190 to 300 ° C, characterized in that the pyrolysis gasoline fraction is subjected to thermal polymerization

It boils in a temperature range of 130 to 210 ° C with a content of less than 2.8% by weight. alpha-methyl-styrene, wherein the weight ratio of alpha-methylstyrene to dicyclopentadiene is maintained in the range of 1: 0.1 to 2.0.

Severogratia, n. P. Plant 7, Most

Price 2,40 Kčs CZECHOSLOVAK SOCIALISTIC REPUBLIC (19) DESCRIPTION OF THE INVENTION X AUTHORIZED EQUIPMENT 260325 (11) (Bl) (51) Int. Cl.4 B 27 G 19/02 (22) Registered 22 12 86 (21) (PV 9776-86.E) (40) Published 16 05 88 Office for Inventions A Discoveries (45) Published 15 04 89 (75) SUROVClK RUDOLF, TOP CENTER Author of the invention (54) Saw blade guard 1

The saw blade guard consists of a body provided with a cover plate lift on the input section and a sectional bolt on the outlet section. The problem of increasing the level of safety at work is achieved by the fact that one end of a two-armed lever is attached to the hinge pin of the telescope, the other end of which is provided with a weight and whose middle portion is recessed by the first rib of the wedge-shaped wedge and is parallel to the two-armed lever. a one-armed lever arranged at the end of which is attached to an additional hinge member of the housing body and the other end of which is attached to the second rib member of the slackening wedge. 15 1 13 10 3 4 12 - '1K 2. ...... / / Λ Thu, 7 sec-l- / - Ml • -Λ · · - '- 11 JV 4- • J9b - r -----—- J. FIG. f 280325

Claims (6)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective disk guard housing comprising a housing body provided on the inlet portion with a lifting knob and a hinge pin on the outlet portion. According to the prior art, the hinge pin of the housing body is attached to a support bracket, fixed, for example, to a table top of a circular saw, possibly at a different time to a fixed position relative to the table top. the cut material to the saw blade is rotated around the hinge pin, which has a solidly fixed position. This results in a sliding gap between the top and bottom edges of the housing body, which makes it more inclined, so that the body of the cover is more inclined, thus the thinner the material is fed to the saw. Chips may be flushed through the slot and, on the other hand, the operator may be in direct contact with the saw. The above-mentioned drawbacks are eliminated by the saw blade guard according to the invention, wherein one end of a two-arm lever is attached to the hinge pin of the housing body, the second end of which is provided with a weight and whose central part is attached to the first pin a single-armed lever is disposed on the rib of the boiling wedge and parallel to the double-armed lever, one end of which is attached to an additional hinge pin on the protective cover body and the other end of which is attached to the second rib of the wedge wedge. The advantage of the protective cover according to the invention is that it increases the degree of safety at work, since the lower edges of the protective cover are parallel to the table top in each half-fold of the cover, whereby the saw blade is in the good thickness of the cut material in extent of work is always covered to a maximum extent]. In this case, the device is inexpensive. The advantage of the maximum coverage of the saw blade in each cover position is particularly advantageous when the cover body is provided with a suction head in its upper part. In this case, more efficient extraction of the sawmill space is achieved. Furthermore, it is advantageous if the protective body is provided with a bell in its entrance part with a front viewing window and a side viewing window and an air nozzle and a light body from the inside. This will further increase safety at work, which also has a beneficial effect. to work productivity. An example of an embodiment of a protective cover according to the invention is shown in the drawing, in which FIG. 1 shows a side view of the cover body, FIG. 2 is a plan view, FIG. Fig. 3 is a sectional view of a portion of the housing with the illuminating body in plane A-A of Fig. 2; Fig. 4 is a sectional view of the housing with the observation eyes shown in the plane B-B of Fig. 1; 5 is a schematic side elevational view of the overall saw assembly; and FIG. 6 shows the overall disposition of a saw equipped with a cover according to the invention. The saw blade guard consists of a housing body 1, the inlet part of which is provided with a cover plate 2 of the cover and an outlet part of the hinge pin 3. One end of the double-lever lever 4 is attached to the hinge pin 3, the second free end of which has a weight 5. The middle part of the double-arm lever 4 is attached to the first portion 6 of the rib 7 of the wedge-shaped wedge 8. Below the double-arm lever 4 there is a single-arm lever 9 parallel to it, the end of which is attached to the auxiliary suspension. a pin 10 fixed to the protective cover body 1 and the other end of which is connected to the second pin 11 of the rib 7 of the folding handle 8. Said rib 7 is also provided in its upper part with a fixed stop 12 of a pre-arm lever 4. the one-arm lever 9 is traversed and is arranged on both sides of the folding wedge 7. The housing 1 of the protective cover is in its upper part disposed by adapters, appendage 13 of connecting the flange Jovana · In the inlet portion is TE-1 Leso protective cover provided with a window 14 zvonkučelným and viewing bočnýmpozorovacím the window 15 and the inside-pressure air jet 16 and the illumination telesom17. Compressed air nozzle 16 consists of a tube provided with exhaust ports directed at the glasses of both viewing windows 14, 15. The illuminating body 17 is arranged so as to be located in the tubular extension 18 of the casing body 1 with its socket. The two-arm lever 4 together with the single-arm lever 9 form a parallelogram mechanism which allows a parallel movement of the housing body 1 with the table plate to lift the lifting disc 2 when entering the material into the saw blade space19. Since, with any material thickness, the gap between the lower edges of the casing body 1 and the material to be cut is at least at minimum material thickness, the possibility of injury is minimal. The solid-state 12 delimits the vertical movement of the housing body 1, thereby also preventing the formation of the back of the cut material and thus protecting the operator. If the housing body 1 is provided with a suction attachment 13, it will in particular catch the secondary chips formed at the location 20 of the second contact of the saw blade 19 with the cut material. Even in this case, the horizontal position of the casing body 1 has a beneficial effect, manifesting itself in a reduction in the amount of undesired suction air. The sighting windows 14, 15, together with the compressed air nozzle 16 and the illuminating body 17, allow direct observation of the cut through the danger to the worker, which is particularly important