Concrete crushing tongs

Details Concrete crushing tongs Concrete crushing tongs

1997-01-03

1998-10-20

Melius, Terry Lee

Excavating

Combined or convertible

Combined with clamp, grapple, or shear

30134, E02F 396

Patent

active

058228934

DESCRIPTION:

BRIEF SUMMARY
The invention relates to concrete crushing tongs according to the preamble of claim 1. Such concrete crushing tongs are known from DE 36 18 191 C2.
The DE 40 13 126 A1 discloses concrete crushing tongs having a stationary first jaw of tongs which is formed as a frame and comprises a cutting means having a plurality of first cutting edges, and a second jaw of tongs which comprises a cutting means with a plurality of second cutting edges and which is connected to the first jaw of tongs through a pivot joint, whereby the first jaw of tongs comprises a concrete crushing portion which projects beyond the first cutting edges in direction towards the second jaw of tongs, and the second jaw of tongs comprises a concrete crushing portion which projects beyond the second cutting edges in direction towards the first jaw of tongs, and whereby in operation first the two concrete crushing portions cooperate for crushing the concrete and thereafter the cutting edges cooperate for cutting the reinforcement.
The known concrete crushing tongs are problematic because of the risk of crushed material getting jammed in the jaws, thereby causing a work interruption and/or an increased wear of the movable or crushing and cutting, resp., parts of the concrete crushing tongs because of the arising distortion forces, further because of the substantially undefined distribution of the reinforcement rods for cutting and of the resulting risk of concrete crushing tongs being blocked by pinched reinforcement rods or of vastly varying cutting clearances and increased wear of the cutting edges resulting therefrom.
It is the object of the invention to provide concrete crushing tongs of the generic type wherein the concrete crushing function and the cutting functions are separate and the reliability which minimizes the wear of the crushing and cutting parts is increased.
This object is achieved by concrete crushing tongs according to claim 1.
With these concrete crushing tongs small variations of cutting clearance are obtained by an increased stability of the first jaw of tongs and a separation of the concrete crushing function from the cutting of the reinforcement by forming the concrete crushing portion of each jaw of tongs to project beyond its cutting edge towards the respective other jaw of tongs, whereby the concrete is essentially crushed before the cutting edges of both jaws cut the reinforcement. Hence, the wear of the cutting edges caused by the high hardness of the quartzes and silicates contained in the concrete in case that the cutting edges substantially participate in the operation of concrete crushing is reduced. The cutting edges may therefore be made of a material which is especially suited for the cutting operation in a form adapted to this cutting operation, whereas the concrete crushing portions can be adapted to the concrete crushing operation. The enlarging interior space prevents the crushed material from jamming within the first jaw of tongs.
Further embodiments of the inventions are defined in the subclaims.
An improved fanning out of the reinforcement and a sequential cutting of the reinforcement is obtained by the particular arrangement of the noses and concave portions.
Further features and advantages of the invention will be apparent from the description of embodiments. In the Figures:
FIG. 1 is a side view of a first embodiment of concrete crushing tongs with a concrete block being schematically shown between the jaw tongs,
FIG. 2 is a perspective view of the first embodiment,
FIG. 3 is a sectional view of the cutting edge of the first jaw of tongs and of its environment in direction of arrow III of FIG. 2,
FIG. 4 is a sectional view of the cutting edge of the second jaw of tongs and of its environment in direction of arrow IV of FIGS. 2,
FIG. 5 is a sectional view of a further embodiment of the cutting edge,
FIG. 6 shows the principle of an improved fanning out of the reinforcement, and
FIG. 7A-D is a side view of a second embodiment showing the principle of fanning out and successive cutting of the reinforcem

REFERENCES:
patent: 4519135 (1985-05-01), LaBounty
patent: 4558515 (1985-12-01), LaBounty
patent: 4771540 (1988-09-01), LaBounty
patent: 5060378 (1991-10-01), LaBounty et al.
patent: 5183216 (1993-02-01), Wack

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