Hammer Drill Wallbolt Accessory for Impact and Nut Rotation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hammer drills with SDS type connections face difficulties in effectively inserting wallbolts, as they lack a suitable mechanism to transmit blows necessary for securing the expansion bolts in hard materials like concrete.
Innovation Solution
An accessory for hammer drills is designed with an SDS connection end and a hexagonal cavity end to accommodate a wallbolt nut, featuring a finger for blow transmission and an elastically deformable member to urge the nut onto the threaded body, allowing for both rotation and impact transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an SDS type connection is used in a hammer drill, then the drill bit can be rotated and subjected to hammering movements, but it becomes difficult to adapt the drill for screwing in fixing elements like wallbolts
Solution Approach 1:
The accessory is divided into distinct functional segments: an SDS connection portion for attachment to the hammer drill, a hollow cylindrical body providing structural support, a finger extending into the cavity for blow transmission, and a hexagonal cavity for nut engagement. This segmentation allows each part to perform its specific function efficiently while maintaining overall simplicity
Solution Approach 2:
The accessory serves multiple functions: it connects to the hammer drill via SDS interface, transmits rotational torque to the wallbolt nut, transmits hammering blows through the finger to the wallbolt threaded body, and provides a cavity for nut engagement. This multi-functionality resolves the contradiction by enabling one accessory to handle both rotation and impact tasks
2Strength
If a conventional drill bit is used for drilling without hammering, then the drill bit can be securely held by chuck jaws, but it cannot transmit hammering blows to facilitate hole production in hard materials
Solution Approach 1:
The accessory acts as an intermediary between the hammer drill and the wallbolt. It receives hammering forces from the drill through the SDS connection, transmits them through its body and finger to the wallbolt threaded body, while also providing rotational engagement through the hexagonal cavity for the nut
3Productivity
If an accessory with finger for blow transmission is used, then wallbolts can be effectively inserted by transmitting impacts, but the accessory must accommodate both rotation and impact transmission functions
Solution Approach 1:
The accessory merges multiple functions into a single integrated component: the hollow cylindrical body provides structural support and torque transmission, the finger extends into the cavity to transmit hammering blows, and the hexagonal cavity engages the nut for rotation. This merging achieves high productivity without excessive complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient insertion of wallbolts by transmitting blows and rotating the nut, overcoming the limitations of existing SDS type connections, and allowing for deeper penetration without limiting depth due to anticlockwise rotation.
Implementation Method 1
an elastically deformable member is mounted around said finger and configured to bear on said nut in order to urge it toward the threaded body, said member is a coil spring that extends in said cavity around said finger
Implementation Method 2
said member is a coil spring that extends in said cavity around said finger and a first end of which is fixed to the bottom of the cavity or to the finger and an opposite second end of which is configured to bear on said nut
Implementation Method 3
this finger being intended to have an outside diameter less than the inside diameter of said nut and being configured to bear axially on one end of a threaded body of said wallbolt to transmit blows
Data Source
Figure 1~4
Figure 5~11
Figure 12a~15c
AI summary
Accessory (30) for a hammer drill (10), said accessory having an elongate shape along an axis A and including a first longitudinal end (30a) for an SDS type connection and a second longitudinal end (30b) including a cavity (33) with axis A and a cross section of hexagonal shape configured to receive a nut (80a) of a wallbolt (80), characterized in that it further comprises a finger (40) with axis A extending in said cavity, this finger being intended to have an outside diameter less than the inside diameter of said nut and being configured to bear axially on one end of a threaded body (80b) of said wallbolt with a view to the transmission of blows.