Electric hand plane

Abstract

This utility model relates to devices for planing wood in joinery and carpentry. A hand-held electric plane comprises a housing with a flat sole and a transverse opening for chip discharge, a handle and a grip attached to the front and rear of the housing, respectively, a flat knife, a chipbreaker, and a knife cover secured with a screw to a wedge at an angle to the sole. The housing contains a U-shaped longitudinal blind groove, in which a wedge is installed. The wedge has a transverse U-shaped through groove and is capable of reciprocating movement within the housing. An eccentric shaft is placed in the wedge groove, the supports of which are mounted in the walls of the housing and covered with covers. The eccentric shaft is connected via a belt drive to the shaft of an electric motor mounted on the housing between the handle and the grip. A compression spring is installed between the housing and the wedge. The wedge is periodically in contact with the eccentric. A reflector cover is mounted above the wedge and secured to the housing.This utility model allows for increased productivity and quality of wood planing during carpentry and joinery work.

Description

[0001] The utility model relates to devices for planing wood when performing carpentry and joinery work.

[0002] A hand-held electric plane is known, comprising a housing with a flat sole and a transverse opening for the exit of shavings, a handle and a grip, fixed, respectively, at the front and back of the housing, a knife fixed on a shaft installed in the housing and connected by a belt drive to an electric motor fixed on the housing from above between the handle and the grip [1].

[0003] This planer processes wood using a milling method, which, when used with a single blade at a high feed rate, results in a wavy surface. In this case, additional processing, such as sanding, is required to improve the surface quality.

[0004] The closest in technical essence and achieved effect to the proposed one is a hand plane, containing a body with a flat sole and a transverse opening for the exit of chips, a handle and a grip, fixed, respectively, in front and behind the body, a flat knife, a chip breaker and a knife cover, fixed with a screw on a wedge at an angle to the sole [2].

[0005] This plane processes wood by planing, but it does not provide high productivity, as it is a hand-held, non-mechanized tool. Planing performance and quality are determined by the physical endurance and skill of the operator.

[0006] The technical objective of the utility model is to increase the productivity and quality of wood planing when performing joinery and carpentry work.

[0007] The solution to the specified problem is achieved by the fact that a U-shaped longitudinal blind groove is made in the housing, in which a wedge is installed, made with a transverse U-shaped through groove and the possibility of translational movement in the housing, an eccentric shaft is placed in the groove of the wedge, the supports of which are installed in the walls of the housing and are closed with covers, the eccentric shaft is connected by a belt drive to the shaft of an electric motor installed on the housing between the handle and the grip, a compression spring is installed between the housing and the wedge, the wedge is periodically in contact with the eccentric, a reflector cover is installed above the wedge, fixed to the housing.

[0008] Comparison of the declared device with the prototype shows that there are new parts and functional connections between them.

[0009] The new parts are: a housing with a U-shaped longitudinal blind groove; a wedge with a transverse U-shaped through groove; an eccentric shaft; an electromechanical drive for rotating the eccentric shaft; a compression spring; a reflector cover.

[0010] New functional connections in the device are formed by new elements.

[0011] The body with a U-shaped longitudinal blind groove serves as a guide for the movable wedge and a base for installing and securing all units and parts of the plane.

[0012] The wedge with a transverse U-shaped through groove is periodically in contact with the eccentric and in constant contact with the compression spring, which leads to intermittent translational movement of the flat knife in the feed direction of the plane.

[0013] The eccentric shaft converts rotary motion into intermittent reciprocating motion of the wedge in the housing.

[0014] The electromechanical drive rotates the eccentric shaft.

[0015] The compression spring keeps the flat knife in contact with the wood being processed when there is no contact between the wedge and the eccentric.

[0016] The reflector cover holds the wedge in the groove of the body, prevents the worker from contacting the movable wedge and the parts fixed to it, and throws the shavings generated during the planing process of wood in a given direction.

[0017] New elements and functional connections improve the productivity and quality of wood planing in joinery and carpentry. Increased productivity is achieved through mechanization of the processing process, while high-quality finished surfaces are ensured by maintaining a consistent planing mode.

[0018] The design diagram of the hand-held electric plane with a local section B - B is shown in Fig. 1 (the belt drive cover 23 has been removed), and the top view of the plane, with the reflector cover 22 removed and a local section A - A, is shown in Fig. 2.

[0019] The electric hand plane comprises a body 1 with a flat sole 2 and a transverse opening 3 for the outlet of chips, a handle 4 and a grip 5, fixed, respectively, at the front and back of the body, a flat knife 6, a chip breaker 7 and a knife cover 8, fixed with a screw 9 on a wedge 10 at an angle to the sole.

[0020] The housing has a U-shaped longitudinal blind groove 11, in which a wedge is installed, formed with a transverse U-shaped through groove 12 and capable of reciprocating movement within the housing. An eccentric shaft 13 is placed in the wedge groove, the supports 14 and 15 of which are mounted in the walls of the housing and covered by covers 16 and 17. The eccentric shaft is connected by a belt drive 18 to the shaft 19 of an electric motor 20, mounted on the housing between the handle and the grip. A compression spring 21 is installed between the housing and the wedge. The wedge is periodically in contact with the eccentric. A reflector cover 22 is installed above the wedge, fixed to the housing. The belt drive is covered by a casing 23.

[0021] The electric hand planer works as follows.

[0022] Before starting work, set the desired planing depth. To do this, remove reflector cover 22, loosen screw 9, and extend flat knife 6 along with chipbreaker 7 beyond sole 2 of plane body 1. Use a template to check the knife's extension relative to the sole. Secure the knife with screw 9 and close the housing groove with the reflector cover.

[0023] Place the planer at the beginning of the workpiece and turn on the electric motor. Apply pressure to handle 4 and handle 5 simultaneously to plane the surface. The forward motion speed (feed) of the planer should be selected based on the hardness of the wood being worked, the presence of knots, and surface irregularities.

[0024] After finishing work, turn off the electric motor, lock the power button and disconnect the power cable from the network.

[0025] Sources of information taken into account

[0026] 1. Construction Machinery and Equipment, Handbook. Electric Planers, Figs. 1 and 2.

[0027] https: / / stroy-technics.ru / article / rubanki-elektricheskie?ysclid=mkpwfrf1a4369931903

[0028] 2. GOST 26665-97 (ISO 2726-73) Interstate standard. Metal planes. Specifications, p. 2, Fig. 1 (prototype).

Claims

A hand-held electric plane comprising a housing with a flat sole and a transverse opening for the outlet of chips, a handle and a grip fixed at the front and back of the housing, respectively, a flat knife, a chip breaker and a knife cover fixed with a screw on a wedge at an angle to the sole, characterized in that a U-shaped longitudinal blind groove is made in the housing, in which a wedge is installed, made with a transverse U-shaped through groove and the possibility of translational movement in the housing, an eccentric shaft is placed in the wedge groove, the supports of which are installed in the walls of the housing and closed with covers, the eccentric shaft is connected by a belt drive to the shaft of an electric motor installed on the housing between the handle and the grip, a compression spring is installed between the housing and the wedge, the wedge is periodically in contact with the eccentric, a reflector cover is installed above the wedge, fixed to the housing.

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