US 4,889,192 AGranted

Tractor-controlled hammer assembly

OwnerSylvio Ricardinventor

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Abstract

An apparatus for supporting conventional hand-held pneumatic breakers in such a way as to break a concrete slab down to the desired precise depth. The slab can be a building floor, bridge deck, or other slab required to be broken to a predetermined depth. The apparatus comprises a mounting frame adapted to replace the bucket of a mini-loader such that the mounting frame can be positioned at an adjusted level and orientation by the hydraulically operated arms and rams of the mini-loader. The mounting frame has an upper flange from which depend U-shaped guiding brackets between which are guided the transverse handlebar of each breaker. A guide for each drill bit of the breakers is fixed to the mounting frame. The breakers are free to move between a top and a lower limit position relative to the mounting frame. In the lower position the handle bars are supported by the bight of the U-shaped brackets. During the concrete slab breaking work, the drill bit abuts on the slab solely under the bias of the hammer weight; this results in precise drilling.

Claims15

Dependent claims

A hammer apparatus for breaking a layer of concrete slab or the like hard material, comprising a rigid frame, vertically adjustable holding means to hold said frame at an adjustable level above said material, at least one pneumatic hammer comprising an elongated upper body with two top transverse handle bars rigid with and extending from opposite sides of said body, a lower reciprocating head, and a drill bit releasably fixed to said drill head, support means fixedly carried by said frame and directly engageable with the underside of said handle bars to hangingly support said upper body at a lower limit position of said upper body relative to said frame, first guide means carried by said frame above said support means and directly engageable with the opposite sides of said handle bars to guide vertical displacement of said upper body between said lower limit position and a top limit position, while preventing rotation of said upper body about its longitudinal axis, second guide means carried by said frame below said support means and guiding the vertical displacement of said drill bit, and indicator means visible to a worker controlling said holding means to enable said worker to readily ascertain at what specific position is the body along said first guide means between its top and lower limit positions, whereby, during layer breaking with said hammer upright and said bit resting on said material, the level of said frame can be adjusted such that said upper body is free to vertically reciprocate relative to said first guide means between said lower and top limit positions.

An apparatus for mounting a hand-held pneumatic hammer for breaking a layer of concrete slab or the like hard material, said hammer of the type comprising an elongated upper body, a lower reciprocating head and a drill bit releasably fixed to said drill head, said apparatus comprising a rigid frame having attachment means to attach said frame to a power-operated, worker-controlled, vertically-adjustable holding means to hold said frame at an adjustable level above said surface, support means fixedly carried by said frame and directly engageable with an underface of said upper body to support said upper body at a lower limit position relative to said frame, first guide means carried by said frame above said support means and directly engageable with opposite sides of said body above said support means to guide vertical displacement of said upper body between said lower limit position and a top limit position, while preventing rotation of said body about its longitudinal axis, second guide means carried by said frame below said support means for guiding vertical displacement of said drill bit and indicator means visible to said worker to enable the latter to readily ascertain at what specific position is the upper body along said first guide means between its top and bottom limit positions, whereby during the breaking work with said drill bit abutting on a hard material, said holding means can be adjusted at a level such that said upper body is free to vertically reciprocate relative to said first guide means between said lower and top limit positions.

Dependencies are inferred from the claim text.