Hand-driven mechanical screwdriver

Patent metadata

Field	Value
Publication number	US-9687971-B2
Application number	US-201414517436-A
Country	US
Kind code	B2
Filing date	Oct 17, 2014
Priority date	Nov 30, 2013
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A hand-driven mechanical screwdriver includes a holding assembly, a drive mechanism supported by the holding assembly, and a working element. The holding assembly includes a bracket and a sliding channel defined in the bracket. The drive mechanism includes a connecting element and a screw rod threadably engaged within the connecting element. An activator is rotatably connected to the connecting element and slidably positioned within the holding assembly bracket sliding channel. The working element is attached to the second end of the screw rod. When the activator is slid along the sliding channel, the connecting element moves from near the second end of the bracket towards the first end of the bracket rotating the threadably engaged screw rod and the working element attached to the screw rod.

First claim

What is claimed is:

1. A hand-driven mechanical screwdriver comprising:
a holding assembly having:
a bracket with a first end and a second end, and with a sliding channel extending in a direction substantially from the first end to the second end defined in the bracket;

a driving mechanism supported by the holding assembly, the driving mechanism having:
a connecting element;
a screw rod threadably engaged within the connecting element, the screw rod having a first end and a second end; and
an activator pivoted on the connecting element and slidably positioned within the holding assembly bracket sliding channel;

a working element attached to the second end of the screw rod;
a housing positioned around the driving mechanism; and
an end of the housing adjacent to the working element defines an elastic portion;
wherein, when the activator is slid along the sliding channel, the connecting element moves from near the second end of the bracket towards the first end of the bracket rotating the threadably engaged screw rod and the working element attached to the screw rod.

2. The hand-driven mechanical screwdriver as claimed in claim 1 , wherein,
the screw rod further defines a plurality of first helical grooves in an exterior surface;
the connecting element defines a receiving channel, the receiving channel defines a plurality of second helical grooves to engage the first helical grooves; and
the driving mechanism comprises a plurality of ball bearings received in the second helical groove.

3. The hand-driven mechanical screwdriver as claimed in claim 2 , wherein, the receiving channel comprises:
a first receiving channel positioned in an end of the connecting element adjacent to the working element;
a second receiving channel communicated to the first receiving channel and positioned in an end of the connecting element away from the working element; and
a shaft shoulder located between and connected to the first receiving channel and second receiving channel;
wherein, a diameter of the first receiving channel is greater than that of the second receiving channel, and the second helical groove is positioned in the second receiving channel.

4. The hand-driven mechanical screwdriver as claimed in claim 3 , wherein, the driving mechanism further comprises a resetting element coiled on an end of the screw rod adjacent to the working element, and the resetting element is resisted against and located between the bracket and shaft shoulder.

5. The hand-driven mechanical screwdriver as claimed in claim 2 , wherein, the driving mechanism further comprises a plug block, and the connecting element further defines an opening configured to receive the plug block.

6. The hand-driven mechanical screwdriver as claimed in claim 5 , wherein, the plug block comprises a slot in a middle portion configured to receive the ball bearings.

7. The hand-driven mechanical screwdriver as claimed in claim 1 , wherein, the sliding channel further defines a first engaging portion along an inner periphery of the sliding channel; and
the activator further defines a second engaging portion to engage the first engaging portion.

8. The hand-driven mechanical screwdriver as claimed in claim 7 , wherein, the activator further comprises a block and the holding assembly further comprises an elastic member coiled on the block; one end of the elastic member is resisted against the activator and the opposite end of the elastic member is resisted against the connecting element.

9. The hand-driven mechanical screwdriver as claimed in claim 8 , wherein, the connecting element further defines a resisting portion to resist against the elastic member.

10. The hand-driven mechanical screwdriver as claimed in claim 1 , wherein, the elastic portion comprises a plurality of folds evenly distanced from each other.

11. The hand-driven mechanical screwdriver as claimed in claim 1 , wherein, an end of the housing defines a latching portion and the connecting element defines a latching groove to engage the latching portion to couple the housing to the connecting element.

12. The hand-driven mechanical screwdriver as claimed in claim 1 , wherein, the bracket comprises:
a main body;
a first supporting seat; and
a second supporting seat extending to a same direction as the first supporting seat; and
the sliding channel is defined in an axial direction of the main body, and the screw rod is rotatably positioned through the first supporting seat and the second supporting seat.

13. The hand-driven mechanical screwdriver as claimed in claim 12 , wherein, the holding assembly further comprises two control elements positioned on opposite ends of the main body and extending into the sliding channel.

14. The hand-driven mechanical screwdriver as claimed in claim 1 , wherein, the working element comprises:
a rotary joint connected to an end of the screw rod away from the connecting element;
a working portion connected to an end of the rotary joint away from the screw rod; and
a connecting portion coiled on a joint of the rotary joint and the working portion.

15. A hand-driven mechanical screwdriver comprising:
a holding assembly having:
a bracket with a first end and a second end, and with a sliding channel extending in a direction substantially from the first end to the second end defined in the bracket;

a driving mechanism supported by the holding assembly, the driving mechanism having:
a connecting element comprising a connecting portion;
a screw rod threadably engaged within the connecting element, the screw rod having a first end a second end; and
an activator comprising a rod portion pivoted to the connecting portion of the connecting element and slidably positioned within the holding assembly bracket sliding channel;

a working element attached to the second end of the screw rod;
a housing positioned around the driving mechanism; and
an end of the housing adjacent to the working element defines an elastic portion;
wherein, when the activator is slid along the sliding channel, the connecting element moves from near the second end of the bracket towards the first end of the bracket rotating the threadably engaged screw rod and the working element attached to the screw rod.

16. The hand-driven mechanical screwdriver as claimed in claim 15 , wherein,
the screw rod further defines a plurality of first helical grooves in an exterior surface;
the connecting element defines a receiving channel, the receiving channel defines a plurality of second helical grooves to engage the first helical grooves; and
the driving mechanism comprises a plurality of ball bearings received in the second helical groove.

17. The hand-driven mechanical screwdriver as claimed in claim 16 , wherein, the receiving channel comprises:
a first receiving channel positioned in an end of the connecting element adjacent to the working element;
a second receiving channel communicated to the first receiving channel and positioned in an end of the connecting element away from the working element; and
a shaft shoulder located between and connected to the first receiving channel and second receiving channel;
wherein, a diameter of the first receiving channel is greater than that of the second receiving channel, and the second helical groove is positioned in the second receiving channel.

18. The hand-driven mechanical screwdriver as claimed in claim 17 , wherein, the driving mechanism further comprises a resetting element coiled on an end of the screw rod adjacent to the working element, and the resetting ele

Assignees

• Hong Fu Jin Prec Ind (Shenzhen) Co Ltd
• Hon Hai Prec Ind Co Ltd

Inventors

• Yu Long
• Li Fang-Quan

Classifications

• B25B15/06 Primary

  operated by axial movement of the handle · CPC title